阅读说明：本技术 一种麦汁薄膜强化传质煮沸系统及其低热负荷煮沸工艺 (Wort film enhanced mass transfer boiling system and low-heat-load boiling process thereof ) 是由 戴晓勇 李占勇 徐庆 张帆 李彦华 吴畏 于 2021-01-14 设计创作，主要内容包括：本发明涉及一种麦汁薄膜强化传质煮沸系统,包括煮沸沉淀槽锅体,离心成膜强化传质装置、蒸汽进口管路系统、蒸汽出口管路系统、一号变频物料泵、二号变频物料泵、麦汁冷却系统和CIP系统,通过煮沸沉淀槽锅体、离心成膜强化传质装置的结合实现二次蒸汽在麦汁湍流膜上与DMS进行高效传质,高效去除DMS,实现冷麦汁DMS含量低于10μg/L；本发明还涉及一种低热负荷煮沸工艺,在稍低于沸点保温代替强烈煮沸,一次能源消耗带来的蒸发量小于1％,同时在煮沸和沉淀结束后麦汁都可在离心成膜强化传质装置中进行真空闪蒸,将麦汁温度降到旋流沉淀前88℃和麦汁冷却前63℃,降低在沉淀冷却阶段热负荷,避免麦汁中过量老化物质产生；合理控氮,提高平衡性和泡沫稳定性。(The invention relates to a mass transfer enhanced boiling system for a wort film, which comprises a boiling precipitation tank pot body, a centrifugal film-forming mass transfer enhanced device, a steam inlet pipeline system, a steam outlet pipeline system, a first variable-frequency material pump, a second variable-frequency material pump, a wort cooling system and a CIP system, wherein the boiling precipitation tank pot body and the centrifugal film-forming mass transfer enhanced device are combined to realize the efficient mass transfer of secondary steam and DMS on a wort turbulent flow film, the DMS is efficiently removed, and the DMS content of chilled wort is lower than 10 mu g/L; the invention also relates to a low thermal load boiling process, which replaces strong boiling with heat preservation slightly lower than the boiling point, the evaporation capacity caused by primary energy consumption is less than 1 percent, and the wort can be subjected to vacuum flash evaporation in a centrifugal film-forming strengthening mass transfer device after boiling and precipitation are finished, the temperature of the wort is reduced to 88 ℃ before cyclone precipitation and 63 ℃ before the wort is cooled, the thermal load in the precipitation cooling stage is reduced, and the generation of excessive aging substances in the wort is avoided; reasonably controlling nitrogen and improving balance and foam stability.)

1. The utility model provides a wort film intensification mass transfer system of boiling which characterized in that: the device comprises a boiling and precipitating tank pot body (26), a centrifugal film-forming strengthening mass transfer device (45), a steam inlet pipeline system (71), a steam outlet pipeline system (72), a first frequency conversion material pump (7), a second frequency conversion material pump (1), a wort cooling system (73) and a CIP system (74), wherein the centrifugal film-forming strengthening mass transfer device (45) is positioned at the top of the boiling and precipitating tank pot body (26), is communicated with a secondary steam outlet (32) arranged at the top of the boiling and precipitating tank pot body (26) from the side part through a fourteenth pneumatic butterfly valve (35), and a rotating shaft (40) of the centrifugal film-forming strengthening mass transfer device penetrates through the center of the secondary steam outlet (32) to reach the bottom of the boiling and precipitating tank pot body (26) through mechanical sealing and is provided with; the steam inlet pipeline (71) is respectively communicated with a steam jacket (85) of a film forming device arranged at the bottom of the centrifugal film forming reinforced mass transfer device (45), a barrel of a boiling precipitation tank pot body (26) and an inlet of a steam jacket (17) on a cone bottom through three branches; the steam outlet pipeline (72) is respectively communicated with a steam jacket (85) of a film forming device arranged at the bottom of the centrifugal film forming reinforced mass transfer device (45), a barrel of a boiling precipitation tank pot body (26) and an outlet of a steam jacket (17) on the conical bottom through three branches; the inlet of the first variable-frequency material pump (7) is respectively connected with the second outlet (16) and the first outlet (14) which are arranged at the bottom of the boiling precipitation tank pot body (26) and the wort outlet (49) which is arranged at the bottom of the centrifugal film-forming reinforced mass transfer device (45) through a third pneumatic butterfly valve (4), a fourth pneumatic butterfly valve (5) and a fifth pneumatic butterfly valve (6); the outlet of the wheat juice cooling system is connected with a wheat juice reflux opening (70) and a tangent inlet (69) which are arranged on the barrel body of the boiling precipitation tank pot body (26) and a hot wheat juice inlet on the wheat juice cooling system (73) through a sixth pneumatic butterfly valve (8), a seventh pneumatic butterfly valve (9) and an eighth pneumatic butterfly valve (10); the inlet of the second variable-frequency material pump (1) is connected with the outlet II (16) arranged at the bottom of the boiling precipitation tank pot body (26) and the outlet III (22) arranged on the cylinder body of the boiling precipitation tank pot body (26) through a first pneumatic butterfly valve (2) and a second pneumatic butterfly valve (3) respectively, and the outlet of the second variable-frequency material pump is connected with the inlet of a liquid distribution system arranged at the top of the centrifugal film-forming reinforced mass transfer device (45).

2. The wort thin film mass transfer enhanced boiling system as claimed in claim 1, wherein: the centrifugal film-forming strengthening mass transfer device (45) is provided with a film-forming device shell (46), a liquid level switch four (38), a mechanical seal (47), a rotating shaft (40), a variable frequency motor (42), a pressure sensor (43), a wort buffer cylinder (37), a film-forming device wort outlet (49) and a liquid distribution device (44), wherein a gravity field diaphragm (50) is fixed on the film-forming device shell, a centrifugal force field diaphragm (51) is fixed on the rotating shaft (40), an indefinite number of turbulence sheets (52) are also arranged on the centrifugal force field diaphragm (51), the bottom of the wort buffer cylinder (37) is connected through a fourteenth pneumatic butterfly valve (35), the bottom of the wort buffer cylinder is separated from a secondary steam outlet (32) through a mechanical seal (79), a film-forming device steam jacket (85) is arranged on the conical bottoms of the wort buffer cylinder (37) and the film-forming device shell (46) and is used for generating a small amount of secondary steam, the top of the shell (46) of the film forming device is connected with the inlet of a vacuum pump (41), the outlet of the vacuum pump (41) is provided with an energy recovery system, and the centrifugal film forming strengthening mass transfer device is a vacuum chamber.

3. The wort thin film mass transfer enhanced boiling system as claimed in claim 1, wherein: a secondary steam outlet (32) at the top of the boiling precipitation tank pot body (26) is connected with a secondary steam exhaust funnel (36), gas emission is controlled through a thirteenth pneumatic butterfly valve (34), the secondary steam outlet (32) is communicated with a centrifugal film-forming reinforced mass transfer device (45) from the side through a fourteenth pneumatic butterfly valve (35), and a temperature sensor (24), a liquid level sensor (23), a cylinder jacket (75), an outlet III (22), a wort return port (70) and a tangent inlet (69) are arranged on a cylinder body of the boiling precipitation tank pot body (26); a steam jacket (17) and a hot coagulum collecting device (15) are arranged on the conical bottom of the boiling precipitation tank pot body (26), wherein the hot coagulum collecting device (15) further comprises a second outlet (16), a first outlet (14) and a first liquid level switch (13), and the first outlet (1)4 is provided with a wort feeding pipeline through a tenth pneumatic butterfly valve (11); the center of the centrifugal film forming and strengthening device is provided with a stirring device (25) for strengthening the collision and agglomeration of the thermal coagulants, and the centrifugal film forming and strengthening device (45) shares a rotating shaft (40) and a variable frequency motor (42).

4. The wort thin film mass transfer enhanced boiling system as claimed in claim 1, wherein: the wort cooling system (73) comprises a plate heat exchanger (58), wherein an ice water inlet, a hot water outlet, a hot wort inlet and a cold wort outlet are formed in the plate heat exchanger (58), and a bimetallic thermometer (57) and a pneumatic regulating valve (55) are arranged on the ice water inlet; a bimetallic thermometer (56) and a fifteenth pneumatic butterfly valve (54) are arranged on the hot water outlet; a bimetallic thermometer (61) is arranged at the hot wheat juice inlet and is connected with the outlet of the first variable-frequency material pump (7) through a pneumatic butterfly valve (10); a bimetallic thermometer (60) is arranged on the cold wort outlet and a wort oxygenating device is removed through a sixteenth pneumatic butterfly valve (62).

5. The wort thin film mass transfer enhanced boiling system as claimed in claim 1, wherein: the inlet main pipe of the CIP system (74) is provided with two branches, wherein one branch is used for cleaning the secondary steam exhaust pipe (36) through a twelfth pneumatic butterfly valve (30) and a ball washing (29), and the other branch is used for cleaning the boiling and precipitating tank pot body (26) through an eleventh pneumatic butterfly valve (27) and a ball washing (28); the CIP cleaning liquid is returned to the CIP system through the first outlet (14) and the ninth pneumatic butterfly valve (11).

6. A low thermal load boiling process using the wort thin film enhanced mass transfer boiling system of claims 1-8, wherein: the method comprises the following steps:

(1) feeding: the temperature of wort entering the boiling precipitation tank is 98 ℃, and if the feeding temperature is insufficient, the temperature can be raised to 98 ℃ by a steam heating system arranged outside the system;

(2) and (3) a heat preservation stage: replacing high-strength boiling with constant temperature keeping, setting the heat preservation temperature of a boiling precipitation tank pot body to be 98 ℃, the upper limit to be 98.5 ℃ and the lower limit to be 97.5 ℃, keeping the constant temperature by using a steam heating system, pumping wort from the boiling precipitation tank pot body to the top of a centrifugal film-forming reinforced mass transfer device for centrifugal film forming, starting a steam jacket of a film forming device to generate a small amount of secondary steam to sequentially pass through a centrifugal force field membrane in the centrifugal film-forming reinforced mass transfer device and a wort turbulent flow membrane on the surface of the gravity field membrane, and performing efficient mass transfer on DMS and the secondary steam during the period, wherein the content of DMS in the secondary steam is higher and higher, the total evaporation capacity is below 1 percent during the heat preservation period due to the temperature lower than the boiling;

(3) heating to boil: heating the wort in the boiling and precipitating tank to boil and keeping heating continuously, pumping the wort into the top of the centrifugal film-forming reinforced mass transfer device for centrifugal film forming, wherein secondary steam generated in the boiling and precipitating tank sequentially passes through a centrifugal force field membrane in the centrifugal film-forming reinforced mass transfer device and a wort turbulent flow membrane on the surface of the gravity field membrane, DMS and the secondary steam carry out efficient mass transfer in the period, the DMS content in the secondary steam is higher and higher, the timing is 10-15 minutes, and the total evaporation capacity is 0.5-0.7%;

(4) vacuum evaporation after boiling: the gauge pressure in the centrifugal film-forming reinforced mass transfer device is controlled to be about-0.4 bar through a vacuum pump, wort is pumped into the top of the centrifugal film-forming reinforced mass transfer device to be centrifugally formed into a film, the wort in a vacuum chamber is vigorously boiled in a film state, DMS separation and discharge are facilitated, meanwhile, secondary steam generated by boiling in a boiling precipitation tank boiler carries out reinforced mass transfer on the surface of a turbulent film of the wort, the content of DMS in the secondary steam is higher and higher, and when the temperature of a final material is reduced to about 86-90 ℃, the low temperature of the stage is beneficial to reducing the SMM cracking into DMS in the precipitation stage and the addition of fragrant hops, the volatilization loss of hop essential oil is reduced, the heat load in the precipitation stage can be reduced, and the TBA value is further;

(5) after the wort is precipitated, cooling and further carrying out vacuum flash evaporation to remove DMS formed in the precipitation stage:

the gauge pressure in the centrifugal film-forming reinforced mass transfer device is controlled to be about-0.8 bar through a vacuum pump, wort is pumped into the top of the centrifugal film-forming reinforced mass transfer device to be centrifugally formed into a film, the wort in a vacuum chamber is vigorously boiled in a film state, DMS separation and discharge are facilitated, meanwhile, secondary steam generated by boiling carries out reinforced mass transfer on the surface of a wort turbulent film, the content of DMS in the secondary steam is higher and higher, the temperature of a final material is reduced to about 61-65 ℃, and the energy consumption of cooling the wort is reduced; the total evaporation produced by steps (4) and (5) is 6-8% by vacuum flash evaporation in a turbulent thin film state.

Technical Field

The invention belongs to the technical field of wort boiling systems and wort boiling processes in beer brewing processes, and particularly relates to a wort thin film mass transfer enhanced boiling system with efficient mass transfer with secondary steam in a wort turbulence film state and a low-heat-load boiling process adopting the wort thin film mass transfer enhanced boiling system.

Background

The brewing process of beer is mainly divided into a Wort preparation process in a hot section and a Wort fermentation process in a cold section, wherein the Wort preparation process is divided into unit operations such as saccharification, filtration, Boiling, cyclone precipitation and the like, and the Wort Boiling (word Boiling) stage is the most energy-consuming unit operation in beer brewing.

Before the wort is oxygenated and used by the yeast cells as a nutrient solution for alcoholic fermentation, the wort must be boiled by a boiling system. Wort boiling is a complex process in which a wide range of chemical, physical, physicochemical and biochemical reactions take place. The purpose is mainly as follows: extraction and isomerization of hop components, formation of hot coagulum, formation of wort stabilized by sterilization of wort and inactivation of residual enzymes, Maillard reaction, formation of some color components, removal of unwanted volatile aroma compounds, reduction of pH and water evaporation, etc. In this process: boiling strength is a main means for influencing the flavor of wort, and the evaluation of the thermal separation effect mostly takes the concentration of an aroma compound dimethyl sulfide (DMS) as an important index; however, strong boiling can subject wort to excessive thermal load, which leads to an increase in carbonyl compounds [ indicated by thiobarbituric acid (TBA) values ], and thus to an excessively rapid ageing of the beer.

The wort boiling unit is subjected to classical normal-pressure boiling (the total evaporation rate is 8-12 percent and even higher), high-pressure boiling (the total evaporation rate is 6-8 percent), low-pressure boiling (the total evaporation rate is 6-7 percent), low-pressure dynamic boiling (the total evaporation rate is 5 percent, a wort boiling form which is commonly used for beer brewing at the present stage) and low-heat load boiling (the heat load is further reduced by means of vacuum flash evaporation, steam stripping and the like), and the reduction of primary energy consumption (the low heat load) is a main pursuit target of the evolution of the wort boiling mode. The research shows that: during wort boiling, most of the reactions are only time and temperature dependent, such as: inactivation of enzymes, sterilization of the wort, extraction and isomerization of hop compounds, coagulation of proteins, lowering the pH, reduction and formation of aroma compounds, etc., all without evaporation, simply maintaining the temperature of the hot wort around the boiling point is sufficient to ensure that these reactions occur. In this process, it is a question of us how to accomplish the DMS separation at low total evaporation (below 1%, which ensures low thermal load and good balance of beer and good foam stability); in the cyclone precipitation stage of the boiled wort, as the wort is kept at high temperature, SMM (methyl methionine) in the wort can be decomposed into DMS continuously, and the DMS content in the boiled wort is increased, so that after the DMS formed in the boiling stage is separated efficiently, how to rapidly remove the DMS generated in the wort precipitation stage in the same system also provides new challenges for a new separation device.

For example, a wort boiling pan is disclosed in chinese patent No. ZL200910223168.8 (No. CN101709249) and a beer saccharification device using the same, which is characterized in that the bottom of the pan is an upwardly protruding bottom, the protruding bottom is provided with a steam heating jacket, a wort inlet pipe passes through the middle of the protruding bottom and opens into the pan, the opening is upward, a wort distribution plate is reversely buckled above the opening, a gap for allowing wort to flow out is left between the wort distribution plate and the opening, wort flows on the jacket in a thin film manner during boiling, the evaporation area is large, and evaporation of unfavorable taste substances is facilitated. The disadvantages of this device are: the secondary steam can not carry out effective mass transfer with the wort film in the boiling stage, and the heat load is high; vacuum flash evaporation cannot be performed due to the special structure; the temperature is reduced because the boiled wort cannot be subjected to vacuum flash evaporation, and the heat load in the precipitation stage is further reduced.

For example, another chinese patent No. ZL200610050478.0 (CN 100398635C) discloses a wort boiling system, which is characterized in that a vacuum chamber is disposed behind the precipitation tank, the vacuum chamber is connected with a vacuum pump, and the wort is subjected to vacuum flash evaporation while passing through the vacuum chamber, so as to effectively remove the SMM generated in the wort at a high temperature during the precipitation stage, but because both the denaturation of protein and the isomerization of hop components require a specific time at a temperature around the boiling point of the wort, the reduction of the boiling time is still desired. The disadvantages of this system are: no effective mass transfer with secondary steam is possible; additional vacuum chambers and their associated systems are required; DMS formed in the boiling stage cannot be removed in time, and the heat load in the boiling stage is high; the temperature is reduced because the boiled wort cannot be subjected to vacuum flash evaporation, and the heat load in the precipitation stage is further reduced.

Finally, the traditional intensive boiling is changed, and a mode of slightly keeping the temperature lower than the boiling point is adopted to further reduce the primary energy consumption in the boiling stage, so that the heat load is reduced, the wort quality is improved, and the method becomes the research direction of a novel wort boiling system; the traditional boiling mode is abandoned, mass transfer of secondary steam with evaporation less than 1% caused by DMS and primary energy consumption is enhanced, effective separation of DMS is realized, and the method becomes a second choice.

Disclosure of Invention

The invention aims to provide a wort thin film enhanced mass transfer boiling system aiming at the defects of the prior art, which realizes that secondary steam performs high-efficiency mass transfer (high-efficiency DMS removal) on a wort turbulent membrane with DMS through the combination of a boiling precipitation tank pot body and a centrifugal film-forming enhanced mass transfer device, and during boiling, the secondary steam generated by boiling performs normal-pressure high-efficiency mass transfer on the surface of the turbulent membrane to remove the DMS; after boiling, secondary steam generated by vacuum flash evaporation is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS formed in the boiling stage, and meanwhile, the temperature of wort before precipitation can be reduced, so that the heat load and TBA value in the precipitation stage are reduced; after the precipitation is finished, secondary steam generated by vacuum flash evaporation is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS formed in the precipitation stage, and meanwhile, the temperature of wort before cooling can be reduced, so that the heat load in the cooling stage is reduced, the TBA value is reduced, and energy consumed by cooling the wort is saved; the whole boiling process can be kept at the temperature lower than the boiling point, the evaporation capacity is less than 1 percent, the primary energy consumption and the heat load are greatly reduced, and then the TBA value is reduced.

The invention also aims to provide a low-heat-load boiling process of the wort thin-film enhanced mass transfer boiling system, which abandons the traditional strong boiling and adopts a low-heat-load boiling process with the temperature slightly lower than the boiling point for heat preservation, so that the high-efficiency mass transfer of DMS and secondary steam is realized in a wort turbulence membrane state, the rapid and effective separation of DMS is realized under the condition that the evaporation capacity is less than 1 percent due to primary energy consumption, and the low-heat-load boiling process has the advantages of extremely low primary energy consumption, low heat load in the boiling stage, at least aging substances generated in wort and prevention of premature aging of beer.

The technical problem to be solved by the invention is realized by the following technical scheme:

a wort thin film mass transfer enhancing boiling system comprises a boiling precipitation tank pot body, a centrifugal film forming mass transfer enhancing device, a steam inlet pipeline system, a steam outlet pipeline system, a first frequency conversion material pump, a second frequency conversion material pump, a wort cooling system and a CIP system, wherein the centrifugal film forming mass transfer enhancing device is positioned at the top of the boiling precipitation tank pot body and is communicated with a secondary steam outlet arranged at the top of the boiling precipitation tank pot body from the side part through a fourteenth pneumatic butterfly valve, and a rotating shaft of the centrifugal film forming mass transfer enhancing device penetrates through the center of the secondary steam outlet to reach the bottom of the boiling precipitation tank pot body through mechanical sealing and is provided with a stirring device; the steam inlet pipeline is respectively communicated with a steam jacket of a film forming device arranged at the bottom of the centrifugal film forming reinforced mass transfer device, a barrel body of the boiling precipitation tank pot body and a steam jacket inlet on the conical bottom through three branches; the steam outlet pipeline is respectively communicated with a steam jacket of a film forming device arranged at the bottom of the centrifugal film forming reinforced mass transfer device, a boiler body cylinder of the boiling precipitation tank and a steam jacket outlet on the conical bottom through three branches; the inlet of the first variable-frequency material pump is respectively connected with the second outlet and the first outlet which are arranged at the bottom of the boiling precipitation tank pot body and the wort outlet which is arranged at the bottom of the centrifugal film-forming reinforced mass transfer device through a third pneumatic butterfly valve, a fourth pneumatic butterfly valve and a fifth pneumatic butterfly valve; the outlet of the wort kettle is connected with a wort return port and a tangential inlet which are arranged on the barrel body of the boiling and precipitating tank pot body and a hot wort inlet on a wort cooling system through a sixth pneumatic butterfly valve, a seventh pneumatic butterfly valve and an eighth pneumatic butterfly valve respectively; and the inlet of the second variable-frequency material pump is connected with the outlet II arranged at the bottom of the pot body of the boiling precipitation tank and the outlet III arranged on the pot body of the boiling precipitation tank through a first pneumatic butterfly valve and a second pneumatic butterfly valve respectively, and the outlet of the second variable-frequency material pump is connected with the inlet of a liquid distribution system arranged at the top of the centrifugal film-forming reinforced mass transfer device.

The centrifugal film-forming reinforced mass transfer device is provided with a film-forming device shell, a liquid level switch IV, a mechanical seal, a rotating shaft, a variable frequency motor, a pressure sensor, a wort buffer cylinder, a film-forming device wort outlet and a liquid distribution device, wherein a gravity field diaphragm is fixed on the film-forming device shell, a centrifugal force field diaphragm is fixed on the rotating shaft, an indefinite number of turbulence plates are further arranged on the centrifugal force field diaphragm, the bottom of the wort buffer cylinder is connected with the bottom of the wort buffer cylinder through a fourteenth pneumatic butterfly valve, the bottom of the wort buffer cylinder is separated from a secondary steam outlet through the mechanical seal, a film-forming device steam jacket is arranged on the wort buffer cylinder and the conical bottom of the film-forming device shell and used for generating a small amount of secondary steam, the top of the film-forming device shell is connected with an inlet of a vacuum pump.

Moreover, a secondary steam outlet at the top of the boiling and precipitating tank body is connected with a secondary steam exhaust barrel, gas emission is controlled through a thirteenth pneumatic butterfly valve, the secondary steam outlet is communicated with a centrifugal film-forming reinforced mass transfer device from the side through a fourteenth pneumatic butterfly valve, and a barrel body of the boiling and precipitating tank body is provided with a temperature sensor, a liquid level sensor, a barrel body jacket, an outlet III, a wort return port and a tangent inlet; a steam jacket and a hot coagulum collecting device are arranged on the conical bottom of the pot body of the boiling precipitation tank, wherein the hot coagulum collecting device also comprises an outlet II, an outlet I and a liquid level switch I, and the outlet I is provided with a wort feeding pipeline through a tenth pneumatic butterfly valve; the center of the centrifugal film-forming strengthening mass transfer device is provided with a stirring device for strengthening the collision and agglomeration of the thermal coagulants, and the centrifugal film-forming strengthening mass transfer device and the stirring device share a rotating shaft and a variable frequency motor.

The wort cooling system comprises a plate heat exchanger, wherein an ice water inlet, a hot water outlet, a hot wort inlet and a cold wort outlet are formed in the plate heat exchanger, and a bimetallic thermometer and a pneumatic regulating valve are arranged on the ice water inlet; a bimetallic thermometer and a fifteenth pneumatic butterfly valve are arranged on the hot water outlet; the hot wheat juice inlet is provided with a bimetallic thermometer and is connected with the outlet of the first variable frequency material pump through a pneumatic butterfly valve; a bimetallic thermometer is arranged on the cold wort outlet and a wort oxygenating device is removed through a sixteenth pneumatic butterfly valve.

In addition, the main pipe at the inlet of the CIP system is provided with two branches, wherein one branch is used for cleaning the secondary steam exhaust funnel through a twelfth pneumatic butterfly valve and a ball washing device, and the other branch is used for cleaning the pot body of the boiling and precipitating tank through an eleventh pneumatic butterfly valve and a ball washing device; the CIP cleaning liquid returns to the CIP system through the first outlet and the ninth pneumatic butterfly valve.

A low thermal load boiling process utilizing the wort thin film enhanced mass transfer boiling system comprises the following steps:

(1) feeding: the temperature of wort entering the boiling precipitation tank is 98 ℃, and if the feeding temperature is insufficient, the temperature can be raised to 98 ℃ by a steam heating system arranged outside the system;

(2) and (3) a heat preservation stage: replacing high-strength boiling with constant temperature keeping, setting the heat preservation temperature of a boiling precipitation tank pot body to be 98 ℃, the upper limit to be 98.5 ℃ and the lower limit to be 97.5 ℃, keeping the constant temperature by using a steam heating system, pumping wort from the boiling precipitation tank pot body to the top of a centrifugal film-forming reinforced mass transfer device for centrifugal film forming, starting a steam jacket of a film forming device to generate a small amount of secondary steam to sequentially pass through a centrifugal force field membrane in the centrifugal film-forming reinforced mass transfer device and a wort turbulent flow membrane on the surface of the gravity field membrane, and performing efficient mass transfer on DMS and the secondary steam during the period, wherein the content of DMS in the secondary steam is higher and higher, the total evaporation capacity is below 1 percent during the heat preservation period due to the temperature lower than the boiling;

(3) heating to boil: heating the wort in the boiling and precipitating tank to boil and keeping heating continuously, pumping the wort into the top of the centrifugal film-forming reinforced mass transfer device for centrifugal film forming, wherein secondary steam generated in the boiling and precipitating tank sequentially passes through a centrifugal force field membrane in the centrifugal film-forming reinforced mass transfer device and a wort turbulent flow membrane on the surface of the gravity field membrane, DMS and the secondary steam carry out efficient mass transfer in the period, the DMS content in the secondary steam is higher and higher, the timing is 10-15 minutes, and the total evaporation capacity is 0.5-0.7%;

(4) vacuum evaporation after boiling: the gauge pressure in the centrifugal film-forming reinforced mass transfer device is controlled to be about-0.4 bar through a vacuum pump, wort is pumped into the top of the centrifugal film-forming reinforced mass transfer device to be centrifugally formed into a film, the wort in a vacuum chamber is vigorously boiled in a film state, DMS separation and discharge are facilitated, meanwhile, secondary steam generated by boiling in a boiling precipitation tank boiler carries out reinforced mass transfer on the surface of a turbulent film of the wort, the content of DMS in the secondary steam is higher and higher, and when the temperature of a final material is reduced to about 86-90 ℃, the low temperature of the stage is beneficial to reducing the SMM cracking into DMS in the precipitation stage and the addition of fragrant hops, the volatilization loss of hop essential oil is reduced, the heat load in the precipitation stage can be reduced, and the TBA value is further;

(5) after the wort is precipitated, cooling and further carrying out vacuum flash evaporation to remove DMS formed in the precipitation stage:

the gauge pressure in the centrifugal film-forming reinforced mass transfer device is controlled to be about-0.8 bar through a vacuum pump, wort is pumped into the top of the centrifugal film-forming reinforced mass transfer device to be centrifugally formed into a film, the wort in a vacuum chamber is vigorously boiled in a film state, DMS separation and discharge are facilitated, meanwhile, secondary steam generated by boiling carries out reinforced mass transfer on the surface of a wort turbulent film, the content of DMS in the secondary steam is higher and higher, the temperature of a final material is reduced to about 61-65 ℃, and the energy consumption of cooling the wort is reduced; the total evaporation produced by steps (4) and (5) is 6-8% by vacuum flash evaporation in a turbulent thin film state.

The invention has the advantages and beneficial effects that:

1. according to the wort thin film mass transfer enhancement boiling system, the combination of the boiling precipitation tank pot body and the centrifugal film-forming mass transfer enhancement device is used for realizing that secondary steam and DMS perform high-efficiency mass transfer (DMS is removed efficiently) on a wort turbulent flow film, and during boiling, the secondary steam generated by boiling performs normal-pressure high-efficiency mass transfer on the surface of the turbulent flow film to remove the DMS; after boiling, secondary steam generated by vacuum flash evaporation is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS formed in the boiling stage, and meanwhile, the temperature of wort before precipitation can be reduced, so that the heat load and TBA value in the precipitation stage are reduced; after the precipitation is finished, secondary steam generated by vacuum flash evaporation is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS formed in the precipitation stage, and meanwhile, the temperature of wort before cooling can be reduced, so that the heat load in the cooling stage is reduced, the TBA value is reduced, and energy consumed by cooling the wort is saved; the whole boiling process can be kept at the temperature lower than the boiling point, the evaporation capacity is less than 1 percent, the primary energy consumption and the heat load are greatly reduced, and then the TBA value is reduced.

2. The wort thin film intensified mass transfer boiling system of the invention is characterized in that a gravity field diaphragm is fixed on a casing of a film forming device, a centrifugal force field diaphragm is fixed on a rotating shaft, an indefinite number of spoilers are arranged on the centrifugal force field diaphragm, the bottom of a wort buffer cylinder is connected through a fourteenth pneumatic butterfly valve, the bottom of the device is separated from the secondary steam outlet by mechanical seal, the wort buffer cylinder and the conical bottom of the shell of the film forming device are provided with a steam jacket of the film forming device, used for generating a small amount of secondary steam, the top of the shell of the film forming device is connected with the inlet of a vacuum pump, the outlet of the vacuum pump is provided with an energy recovery system, the centrifugal film forming strengthening mass transfer device is a vacuum chamber, after boiling, the secondary steam generated by vacuum flash evaporation is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS formed in the boiling stage, and meanwhile, the temperature of wort before precipitation can be reduced, so that the heat load and TBA value in the precipitation stage are reduced.

3. According to the wort thin film enhanced mass transfer boiling system, a secondary steam outlet at the top of a boiling precipitation tank pot body is connected with a secondary steam exhaust funnel, gas emission is controlled through a thirteenth pneumatic butterfly valve, the secondary steam outlet is communicated with a centrifugal film forming enhanced mass transfer device from the side through a fourteenth pneumatic butterfly valve, the centrifugal film forming enhanced mass transfer device shares a rotating shaft and a variable frequency motor, the boiling precipitation tank pot body and the centrifugal film forming enhanced mass transfer device are organically combined by the system, efficient communication of secondary steam is achieved, and meanwhile the rotating shaft and the variable frequency motor are shared, so that the structure is simplified, and control is facilitated.

4. The low heat load boiling process of the wort film enhanced mass transfer boiling system is different from the traditional boiling mode: the traditional boiling method is only to separate DMS out through secondary steam by large evaporation intensity; the invention can make the secondary steam and wort carry out high-efficiency mass transfer in a turbulent membrane state, the DMS contained in the secondary steam is higher, and the secondary steam demand is reduced, thereby reducing the boiling intensity, saving the primary energy consumption and reducing the heat load.

5. The low-heat-load boiling process of the wort film enhanced mass transfer boiling system can adopt a heat preservation mode below the boiling temperature in the boiling stage, and abandons the traditional strong boiling to realize the cracking of SMM into DMS, protein denaturation and hop isomerization. During the period, the total evaporation rate is less than 1%, the generated DMS is subjected to high-efficiency mass transfer removal on the surface of a turbulence membrane through secondary steam generated by vacuum flash evaporation after boiling, the temperature of wort before precipitation can be reduced, the heat load and TBA value in the precipitation stage are further reduced, and the addition of the aroma type hops in the stage is facilitated (the volatilization of hop essential oil is reduced at low temperature).

6. The low-heat-load boiling process of the wort thin-film enhanced mass transfer boiling system disclosed by the invention has the advantages that the boiling strength is properly improved in boiling, secondary steam generated in boiling is subjected to high-efficiency mass transfer on the surface of a wort turbulence membrane to remove DMS generated by SMM cracking due to high temperature, and the influence of the concentration rise of DMS in wort on SMM cracking is reduced.

7. According to the low-heat-load boiling process of the wort film enhanced mass transfer boiling system, after the precipitation is finished, secondary steam generated by vacuum flash evaporation is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS generated by SMM cracking in the precipitation stage, the temperature of wort before cooling can be reduced, the heat load in the cooling stage is further reduced, the TBA value is further reduced, and energy consumed by cooling the wort can be saved.

8. The low-heat-load boiling process of the wort thin-film enhanced mass transfer boiling system can realize vacuum flash evaporation and thin-film enhanced mass transfer of materials in both boiling and precipitation stages, and is finished in the same device, so that the cost is saved.

9. The low thermal load boiling process of the wort film enhanced mass transfer boiling system ensures low thermal load and low TBA value under the condition of low total evaporation capacity (below 1 percent) brought by first energy consumption, is beneficial to avoiding the premature appearance of aging taste of beer, ensures that coagulable nitrogen of wort is only slightly higher than that of the traditional boiling, and ensures that the beer has good balance and foam stability.

Drawings

FIG. 1 is a general flow diagram of the wort thin film enhanced mass transfer boiling system of the present invention;

description of the reference numerals

1-second frequency conversion material pump, 2-first pneumatic butterfly valve, 3-second pneumatic butterfly valve, 4-third pneumatic butterfly valve, 5-fourth pneumatic butterfly valve, 6-fifth pneumatic butterfly valve, 7-first frequency conversion material pump, 8-sixth pneumatic butterfly valve, 9-seventh pneumatic butterfly valve, 10-eighth pneumatic butterfly valve, 11-ninth pneumatic butterfly valve, 12-tenth pneumatic butterfly valve, 13-liquid level switch I, 14-outlet I, 15-thermal coagulum collecting device, 16-outlet II, 17-conical bottom jacket, 18-stop valve I, 19-pneumatic angle seat valve I, 20-pneumatic angle seat valve II, 21-stop valve II, 22-outlet III, 23-liquid level switch II, 24-temperature sensor I, 25-stirring device, 26-boiling precipitation tank pot body, 27-eleventh pneumatic butterfly valve, 28-ball washing, 29-ball washing, 30-twelfth pneumatic butterfly valve, 31-sight lamp, 32-secondary steam outlet, 33-manhole, 34-thirteenth pneumatic butterfly valve, 35-fourteenth pneumatic butterfly valve, 36-secondary steam exhaust tube, 37-wort buffer tube, 38-liquid level switch III, 39-secondary steam, 40-rotating shaft, 41-vacuum pump, 42-variable frequency motor, 43-pressure sensor, 44-liquid distribution system, 45-centrifugal film forming and strengthening mass transfer device, 46-film forming device shell, 47-mechanical seal, 48-pressure gauge, 49-film forming device wort outlet, 50-gravity field diaphragm, 51-centrifugal force field diaphragm, 52-spoiler, 53-liquid level switch III, 54-fifteenth pneumatic butterfly valve, 55-pneumatic regulating valve, 56-57-bimetallic thermometer, 58-plate heat exchanger, 59-temperature sensor II, 60-61-bimetallic thermometer, 62-sixteenth pneumatic butterfly valve, 63-filter, 64-drain valve, 65-check valve, 66-filter, 67-drain valve, 68-check valve, 69-tangent inlet, 70-wort return port, 71-steam inlet pipeline system, 72-condensed water outlet pipeline system, 73-wort cooling system, 74-CIP system, 75-barrel jacket, 76-liquid level switch V, 77-seventeenth pneumatic butterfly valve, 78-eighteenth pneumatic butterfly valve, 79-mechanical seal, 80-filter, 81-drain valve, 82-check valve, 83-pneumatic angle seat valve II, 84-stop valve II, 85-film forming device steam jacket.

Detailed Description

The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

A wort film mass transfer enhancing boiling system comprises a boiling precipitation tank pot body 26, a centrifugal film-forming mass transfer enhancing device 45, a steam inlet pipeline system 71, a steam outlet pipeline system 72, a first frequency conversion material pump 7, a second frequency conversion material pump 1, a wort cooling system 73 and a CIP system 74.

The centrifugal film-forming strengthening mass transfer device 45 is provided with a film-forming device shell 46, a liquid level switch IV 38, a mechanical seal 47, a rotating shaft 40, a variable frequency motor 42, a pressure sensor 43, a wort buffer cylinder 37, an outlet 49 and a liquid distribution device 44. Wherein a gravity field membrane 50 is fixed on the shell, a centrifugal force field membrane 51 is fixed on the rotating shaft 40, and an indefinite number of spoilers 52 are arranged on the centrifugal force field membrane 51. The bottom of the wort buffer tank 37 is communicated with the secondary steam outlet 32 from the side part through a fourteenth pneumatic butterfly valve 35, and the bottom of the wort buffer tank is separated from the secondary steam outlet 32 through a mechanical seal 79. The wort buffer cylinder 37 and the conical bottom of the film forming device shell 46 are provided with a film forming device steam jacket 85 for generating a small amount of secondary steam. The top of the housing 46 is connected to the inlet of a vacuum pump 41, and the outlet of the vacuum pump 41 is used for the energy recovery system.

The top of the boiling precipitation tank pot body 26 is provided with a secondary steam outlet 32, a sight lamp 31 and a manhole 33, wherein the secondary steam outlet 32 is respectively connected with a secondary steam exhaust funnel 36, the gas discharge is controlled by a thirteen pneumatic butterfly valve 34, and the secondary steam outlet is communicated with a centrifugal film-forming reinforced mass transfer device 45 from the side part by a fourteenth pneumatic butterfly valve 35; the barrel of the boiling and precipitating tank pot body 26 is provided with a temperature sensor 24, a liquid level sensor 23, a barrel jacket 75, a third outlet 22, a wort return opening 70 and a tangent inlet 69; the conical bottom of the boiling precipitation tank pot body 26 is provided with a steam jacket 17 and a hot coagulum collecting device 15, wherein the hot coagulum collecting device 15 also comprises an outlet II 16, an outlet I14 and a liquid level switch I13; the center of the boiling precipitation tank pot body 26 is provided with a stirring device 25 for strengthening the collision and agglomeration of thermal coagulants, and the stirring device and a centrifugal film-forming strengthening mass transfer device 45 use the same variable frequency motor 42 and a rotating shaft 40; the first outlet 14 is provided with a wort feeding pipeline through a tenth pneumatic butterfly valve 12.

The main pipe of the steam inlet pipe 71 is provided with a pressure gauge 48, and then three branches are provided, wherein one branch is connected with the inlet of the steam jacket 85 of the film forming device through a stop valve 84 and a pneumatic angle seat valve 83, one branch is connected with the inlet of the cylinder jacket 75 through a stop valve 21 and a pneumatic angle seat valve 20, and the other branch is connected with the inlet of the cone jacket 17 through a stop valve 18 and a pneumatic angle seat valve 20.

The main pipe of the steam outlet pipe 72 is provided with three branches, one of which is connected to the outlet of the steam jacket 85 of the above-mentioned filming device through a filter 80, a drain valve 81 and a check valve 82, one of which is connected to the outlet of the above-mentioned cylinder jacket 75 through a filter 63, a drain valve 64 and a check valve 65, and the other of which is connected to the outlet of the above-mentioned steam jacket 17 through a filter 68, a drain valve 67 and a check valve 66.

The inlet of the first variable-frequency material pump 7 is respectively connected with the wort outlet 49 of the film forming device through a third pneumatic butterfly valve 4, a fourth pneumatic butterfly valve 5 and a fifth pneumatic butterfly valve 6, the second outlet 16 and the first outlet 14; the outlet of the first variable-frequency material pump 7 is connected with the wort return port 70, the tangent inlet 69 and the inlet of the wort cooling system 73 through a sixth pneumatic butterfly valve 8, a seventh pneumatic butterfly valve 9 and an eighth pneumatic butterfly valve 10 respectively.

The inlet of the second variable-frequency material pump 1 is connected with the second outlet 16 and the third outlet 22 through a first pneumatic butterfly valve 2 and a second pneumatic butterfly valve 3 respectively; the outlet of the second frequency conversion material pump 1 is connected with the inlet of the liquid distribution system.

The main body of the wort cooling system 73 is a plate heat exchanger 58, and the plate heat exchanger 58 is provided with an ice water inlet, a hot water outlet, a hot wort inlet and a cold wort outlet. Wherein a bimetallic thermometer 57 and a pneumatic regulating valve 55 are arranged on the ice water inlet; a bimetallic thermometer 56 and a pneumatic butterfly valve 54 are arranged on the hot water outlet; a bimetallic thermometer 61 is arranged at the hot wheat juice inlet and is connected with the outlet of the first variable-frequency material pump 7 through the pneumatic butterfly valve 10; a bimetallic thermometer 60 is arranged on the cold wort outlet and a wort oxygenating device is removed through a sixteenth pneumatic butterfly valve 62.

The main pipe at the inlet of the CIP system 74 is provided with two branches, wherein one branch is used for cleaning the secondary steam exhaust pipe 36 through a pneumatic butterfly valve 30 and a washing ball 29, and the other branch is used for cleaning the boiling and settling tank pot 26 through a pneumatic butterfly valve 27 and a washing ball 28; the CIP cleaning solution is returned to the CIP system through the first outlet 14 and the pneumatic butterfly valve 11.

The invention relates to a low-heat load boiling process of a wort film enhanced mass transfer boiling system, which comprises the following steps:

(1) feeding:

opening a tenth pneumatic butterfly valve 12, feeding wort into a boiling precipitation tank pot body, wherein the preheating temperature of the wort is 98 ℃, and if the feeding temperature is insufficient, heating the wort to 98 ℃ by using a steam heating system arranged outside the system;

if the wort is not preheated or is less than 98 ℃ after preheating, when the wort covers the steam jacket 17 during feeding, the stop valve 18 and the pneumatic angle seat valve 19 are firstly opened to heat the wort in advance, when the feeding is finished, the stop valve 21 and the pneumatic angle seat valve 20 are opened, the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20 are controlled to be opened and closed through the temperature sensor I24 and the PLC, and when the temperature reaches 98 ℃, the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20 are automatically closed and the next process is automatically carried out;

(2) and (3) a heat preservation stage: replacing high-strength boiling with constant temperature keeping, setting the heat preservation temperature of a boiling precipitation tank pot body to be 98 ℃, the upper limit to be 98.5 ℃ and the lower limit to be 97.5 ℃, keeping the constant temperature by using a steam heating system, pumping wort from the boiling precipitation tank pot body to the top of a centrifugal film-forming reinforced mass transfer device for centrifugal film forming, starting a steam jacket of a film forming device to generate a small amount of secondary steam to sequentially pass through a centrifugal force field membrane in the centrifugal film-forming reinforced mass transfer device and a wort turbulent flow membrane on the surface of the gravity field membrane, and performing efficient mass transfer on DMS and the secondary steam during the period, wherein the content of DMS in the secondary steam is higher and higher, the total evaporation capacity is below 1 percent during the heat preservation period due to the temperature lower than the boiling;

the specific operation is as follows: the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20 are controlled to be opened and closed through the PLC and the temperature sensor I24 when the temperature is as low as 97.5 ℃ and is closed when the temperature is as high as 98.5 ℃. During the period: 1) opening a second pneumatic butterfly valve 3 and a second variable-frequency material pump 1; 2) starting the vacuum pump 41 and the fourteenth pneumatic butterfly valve 35, and controlling the gauge pressure in the tank to be 0bar through the pressure sensor 43 and the PLC; 3) opening the fourteenth pneumatic butterfly valve 35; 4) opening the stop valve 84 and the pneumatic angle seat valve 83; 5) the variable frequency motor 42 is turned on and the frequency is set to a speed of about 560 rpm. The material is uniformly aired on the top of the gravity field membrane 50 through the liquid distribution system 44, the material uniformly flows to the bottom of the next centrifugal field membrane 51, under the action of centrifugal force, the wort gradually rises to the top of the gravity field membrane 51 along the surface of the centrifugal field membrane 51 in the form of a turbulent film and falls to the top of the conical bottom of the shell 46, the wort is formed into a film along the wall surface of the shell and falls, and the turbulent film is formed on the wort film under the disturbance of the second turbulence plate 52; the small amount of secondary steam 39 generated by the steam jacket 85 of the film forming device is subjected to mass transfer enhancement through the surface of the wort turbulent film in the gap between the gravity field film and the centrifugal field film, and the DMS content in the secondary steam 39 is higher and higher. In the period, the stirring device 25 strengthens the collision and agglomeration of the hot concretions, and reduces the problem of insufficient collision and agglomeration of the hot concretions caused by low boiling strength and weak wort rolling. During the heat preservation period, the total evaporation amount is below 1% due to the temperature being lower than the boiling point of wort, the heat preservation time is 50 minutes (if the 4 th step is not selected, the time is set as 60 minutes), and all opening items are closed after the time is up, so that the step (4) is automatically entered.

(3) Heating to boil:

heating the wort in the boiling and precipitating tank to boil and keeping heating continuously, pumping the wort into the top of the centrifugal film-forming reinforced mass transfer device for centrifugal film forming, wherein secondary steam generated in the boiling and precipitating tank sequentially passes through a centrifugal force field membrane in the centrifugal film-forming reinforced mass transfer device and a wort turbulent flow membrane on the surface of the gravity field membrane, DMS and the secondary steam carry out efficient mass transfer in the period, the DMS content in the secondary steam is higher and higher, the timing is 10-15 minutes, and the total evaporation capacity is 0.5-0.7%.

The specific process is as follows: the set temperature is 100 ℃, and the opening of the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20 is controlled by the PLC and the temperature sensor I24. After reaching 100 ℃ (keeping the pneumatic angle seat valve open continuously): 1) opening a second pneumatic butterfly valve 3 and a second variable-frequency material pump 1; 2) starting the vacuum pump 41 and the fourteenth pneumatic butterfly valve 35, and controlling the gauge pressure in the tank to be 0bar through the pressure sensor 43 and the PLC; 3) a fifth pneumatic butterfly valve 6, a sixth pneumatic butterfly valve 8 and a first variable-frequency material pump 7 are started, the first variable-frequency material pump 7 is closed when the liquid level is lower than the third 53 liquid level switch in the period, and the first variable-frequency material pump 7 is started when the liquid level is higher than the fourth liquid level switch; 5) the variable frequency motor 42 is turned on and the frequency is set to a speed of about 560 rpm. The material is uniformly aired on the top of the gravity field membrane 50 through the liquid distribution system 44, the material uniformly flows to the bottom of the next centrifugal field membrane 51, under the action of centrifugal force, the wort gradually rises to the top of the gravity field membrane 51 along the surface of the centrifugal field membrane 51 in the form of a turbulent film and falls to the top of the conical bottom of the shell 46, the wort is formed into a film along the wall surface of the shell and falls, and the turbulent film is formed on the wort film under the disturbance of the second turbulence plate 52; the secondary steam 39 generated when the boiling precipitation tank 26 is heated and boiled is subjected to mass transfer enhancement through the surface of the wort turbulent membrane in the gap between the gravity field membrane and the centrifugal field membrane, and the DMS content in the secondary steam 39 is higher and higher. And timing for 10 minutes, wherein the total evaporation is about 0.6%, the next step is directly carried out after the time is up, and all opening items are closed.

(4) Vacuum evaporation after boiling:

the internal gauge pressure of the centrifugal film-forming reinforced mass transfer device is controlled to be about-0.4 bar through a vacuum pump, wort is pumped into the top of the centrifugal film-forming reinforced mass transfer device to be centrifugally formed into a film, the wort in a vacuum chamber is vigorously boiled in a film state, DMS separation and discharge are facilitated, meanwhile, secondary steam generated by boiling in a boiling precipitation tank boiler carries out reinforced mass transfer on the surface of a turbulent film of the wort, the content of DMS in the secondary steam is higher and higher, and when the temperature of a final material is reduced to about 86-90 ℃, the low temperature of the stage is beneficial to reducing the SMM cracking into DMS in the precipitation stage, is beneficial to adding fragrant hops, reduces the volatilization loss of hop essential oil, can reduce the heat load in the precipitation stage, and further reduces the TBA value.

The specific process is as follows: 1) opening a second pneumatic butterfly valve 3 and a second variable-frequency material pump 1; 2) starting the vacuum pump 41 and the fourteenth pneumatic butterfly valve 35, and controlling the internal gauge pressure to be about-0.4 bar through the pressure sensor 43 and the PLC; 3) a fifth pneumatic butterfly valve 6, a sixth pneumatic butterfly valve 8 and a first variable-frequency material pump 7 are started, the first variable-frequency material pump 7 is closed when the liquid level is lower than the third 53 liquid level switch in the period, and the first variable-frequency material pump 7 is started when the liquid level is higher than the fourth liquid level switch; 4) the variable frequency motor 42 is turned on and the frequency is set to a speed of about 560 rpm. The material is uniformly aired on the top of the gravity field membrane 50 through the liquid distribution system 44, the material uniformly flows to the bottom of the next centrifugal field membrane 51, under the action of centrifugal force, the wort gradually rises to the top of the gravity field membrane 51 along the surface of the centrifugal field membrane 51 in the form of a turbulent film, falls to the top of the conical bottom of the shell 46 of the film forming device and is formed into a film along the wall surface of the conical bottom and descends, and the turbulent film is formed on the wort film under the disturbance of the second turbulent flow sheet 52; the DMS content in the secondary steam 39 will be higher and higher because the vacuum-generated secondary steam 39 performs enhanced mass transfer through the turbulent membrane surface of the wort in the gap between the gravity field membrane and the centrifugal field membrane. When the temperature in the tank is reduced to about 88 ℃ (the low temperature in the stage is beneficial to adding the fragrant hops, the volatilization loss of the hop essential oil is reduced, the heat load in the precipitation stage can be reduced, and then the TBA value is reduced), the next step is directly carried out, and all opening items are closed.

(5) And (3) cyclone precipitation:

after the wort is precipitated, cooling and further carrying out vacuum flash evaporation to remove DMS formed in the precipitation stage: starting a third pneumatic butterfly valve 4, a seventh pneumatic butterfly valve 9 and a first variable-frequency material pump 7, timing for 10 minutes, carrying out rotational flow on the wort, and settling hot coagulants and the like through centrifugal force; all open entries were closed after 10 minutes had arrived, timing was continued for 20 minutes, and 20 minutes arrived immediately before proceeding to the next step.

(6) After the wort is precipitated, cooling and further carrying out vacuum flash evaporation to remove DMS formed in the precipitation stage:

the gauge pressure in the centrifugal film-forming reinforced mass transfer device is controlled to be about-0.8 bar through a vacuum pump, wort is pumped into the top of the centrifugal film-forming reinforced mass transfer device to be centrifugally formed into a film, the wort in the vacuum chamber is vigorously boiled in a film state, DMS separation and discharge are facilitated, secondary steam generated by boiling is subjected to reinforced mass transfer on the surface of a wort turbulent film, the content of DMS in the secondary steam is higher and higher, the temperature of a final material is reduced to about 61-65 ℃, and energy consumption of cooling the wort is reduced.

The specific process is as follows: 1) the first pneumatic butterfly valve 2 and the second variable frequency material pump 1 are opened, and when the liquid level is reduced to a liquid level switch II 23, the pneumatic butterfly valve 2 is closed and the second pneumatic butterfly valve 3 is opened; 2) starting the vacuum pump 41 and the fourteenth pneumatic butterfly valve 35, and controlling the internal gauge pressure to be about-0.8 bar through the pressure sensor 43 and the PLC; 3) and opening a fifth pneumatic butterfly valve 6, a seventh pneumatic butterfly valve 9, an eighth pneumatic butterfly valve 10 and a first variable frequency material pump 7, closing the first variable frequency material pump 7 when the liquid level is lower than the third liquid level switch 53, and opening the first variable frequency material pump 7 when the liquid level is higher than the fourth liquid level switch. 4) The variable frequency motor 42 is turned on and the frequency is set to a speed of about 560 rpm. The material is uniformly aired on the top of the gravity field membrane 50 through the liquid distribution system 44, the material uniformly flows to the bottom of the next centrifugal field membrane 51, under the action of centrifugal force, the wort gradually rises to the top of the gravity field membrane 51 along the surface of the centrifugal field membrane 51 in the form of a turbulent film, falls to the top of the conical bottom of the shell 46 of the film forming device and is formed into a film along the wall surface of the conical bottom and descends, and the turbulent film is formed on the wort film under the disturbance of the second turbulent flow sheet 52; the DMS content in the secondary steam 39 will be higher and higher because the vacuum-generated secondary steam 39 performs enhanced mass transfer through the turbulent membrane surface of the wort in the gap between the gravity field membrane and the centrifugal field membrane. 5) The wort temperature is reduced to about 63 ℃ under the vacuum degree (energy is saved compared with the traditional wort cooling at 100 ℃, the heat load of the wort in the cooling stage can be reduced, and then the TBA value is reduced), the pneumatic regulating valve 55 and the pneumatic butterfly valve 54 are started to cool the wort, the wort outlet temperature is set to 10 ℃, ice water at 3 ℃ is used for cooling the wort, the temperature sensor II 59 is used for measuring the wort outlet temperature in the process, the opening degree of the pneumatic regulating valve 55 is controlled through the PLC to control the wort outlet temperature, and all opening items are closed when the liquid level reaches the liquid level sensor V76; 6) and opening the eighteenth pneumatic butterfly valve 78 and the sixteenth pneumatic butterfly valve 62 to carry out top sterile water on the wort in the pipeline, closing and opening after the top sterile water is finished, and directly entering the next step.

(7) CIP cleaning

A seventeenth pneumatic butterfly valve 77 is opened to discharge sewage, and the opening item is closed when the liquid level reaches the first liquid level switch 13; the pneumatic butterfly valve 30/27 is opened for cleaning, and a second material pump 1/7 and related valves can be opened to clean all pipelines and devices in the period; cleaning fluid is returned to the CIP system by opening the ninth pneumatic butterfly valve 11.

And (3) removing DMS formed in the precipitation stage by vacuum flash evaporation in a turbulent film state, vacuum evaporation after boiling in the step (4), and further vacuum flash evaporation before cooling after precipitation of wort in the step (6).

Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, alterations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and thus the scope of the invention is not limited to the embodiments and drawings disclosed.