阅读说明：本技术 一种基于溴化锂低温药材干燥装置 (Based on lithium bromide low temperature medicinal material drying device ) 是由 张娜 李亮 徐青 周慕川 王庆港 谭思雯 刘敏 徐苑 于 2021-01-27 设计创作，主要内容包括：本发明公开了一种基于溴化锂低温药材干燥装置,属于低温干燥技术和余热利用技术领域,基于溴化锂低温药材干燥装置主要包括溴化锂溶液循环、制冷剂循环和低温干燥风道循环。所述溴化锂溶液循环和所述制冷剂循环构成并联环路,从所述溴化锂溶液循环中的发生器分出两条支路完成溴化锂溶液循环和制冷剂循环；所述低温干燥风道循环通过制冷剂循环中的蒸发器与制冷剂循环并联,其中的蒸发器对空气进行降温减湿处理。本申请的药材干燥装置有效利用工艺余热进行溴化锂吸收式制冷循环,减少从干燥箱流出的空气含湿量,并将水分收集在蒸发器中,同时防止因水分过冷在蒸发器内部结霜,采用热水管路融霜,提高运行稳定性。(The invention discloses a lithium bromide-based low-temperature medicinal material drying device, which belongs to the technical field of low-temperature drying technology and waste heat utilization. The lithium bromide solution circulation and the refrigerant circulation form a parallel loop, and two branches are branched from a generator in the lithium bromide solution circulation to complete the lithium bromide solution circulation and the refrigerant circulation; the low-temperature drying air channel is connected with the refrigerant cycle in parallel through an evaporator in the refrigerant cycle, and the evaporator is used for cooling and dehumidifying air. The utility model provides a medicinal material drying device effectively utilizes the technology waste heat to carry out lithium bromide absorption refrigeration cycle, reduces the air moisture content who flows from the drying cabinet to collect moisture in the evaporimeter, prevent simultaneously because of moisture subcooling frosts in the evaporimeter is inside, adopt hot-water line defrosting, improve operating stability.)

1. The utility model provides a based on lithium bromide low temperature medicinal material drying device which characterized in that: the method comprises the steps of lithium bromide solution circulation, refrigerant circulation and low-temperature drying air channel circulation; the lithium bromide solution circulation comprises a generator (1), a waste heat recoverer (2), a pressure reducing valve (3), an absorber (4), a first spraying device (5), a generator pump (6) and a second spraying device (7); wherein the generator (1) is filled with a lithium bromide concentrated solution, and the absorber (4) is filled with a lithium bromide dilute solution; the solution outlet end of the generator (1) is connected with the inlet end of a pressure reducing valve (3) through a waste heat recoverer (2), the generator (1) is also connected in parallel with a waste heat pipeline, the outlet end of the pressure reducing valve (3) is connected with a first spraying device (5) in an absorber (4), the solution outlet end of the absorber (4) is connected with the inlet end of a generator pump (6), the absorber (4) is also connected in parallel with a cooling water pipeline, and the outlet end of the generator pump (6) is connected with a second spraying device (7) in the generator (1) through the waste heat recoverer (2); the generator (1) in the lithium bromide solution circulation absorbs waste heat, the refrigerant is heated and vaporized and is separated from the lithium bromide solution, so that the refrigerant and the lithium bromide solution are respectively circulated from two branches in the generator (1), and the lithium bromide solution circulation and the refrigerant circulation form a parallel loop; the lithium bromide concentrated solution in the generator (1) sequentially passes through a waste heat recoverer (2), a pressure reducing valve (3), an absorber (4), a first spraying device (5), a generator pump (6), the waste heat recoverer (2), the generator (1) and a second spraying device (7) to form a closed loop; the refrigerant cycle comprises a generator (1), a condenser (8), an expansion valve (9), an evaporator (10) and an absorber (4); the gas outlet end of the generator (1) is connected with the inlet end of a condenser (8), the outlet end of the condenser (8) is connected with the inlet end of an expansion valve (9), the outlet end of the expansion valve (9) is connected with the inlet end of an evaporator (10), and the outlet end of the evaporator (10) is connected with an absorber (4); wherein the evaporator (10) of the refrigerant cycle is connected in parallel with the low-temperature drying air duct cycle; refrigerant vaporized from the generator (1) passes through the condenser (8), the expansion valve (9) and the evaporator (10) in sequence, is finally absorbed by the lithium bromide dilute solution in the absorber (4), and is conveyed to the generator (1) together with the lithium bromide dilute solution through a pipeline to form a closed loop; the low-temperature drying air channel circulation comprises an evaporator (10), an air channel (11), a drying box (12) and a fan (14); the outlet end of the evaporator (10) is connected with the inlet end of the drying box (12), the evaporator (10) is connected in series with a hot water pipeline, the outlet end of the drying box (12) is connected with the inlet end of a fan (14), and the outlet end of the fan (14) is connected with the inlet end of the evaporator (10); the air is connected with the evaporator (10), the drying box (12) and the fan (14) through an air duct (11) to form a closed loop.

2. Drying apparatus according to claim 1, wherein: the lithium bromide solution circularly absorbs the process waste heat, the refrigerant absorbs heat and is vaporized in the generator (1), the refrigerant enters the condenser (8), and the lithium bromide concentrated solution in the generator (1) enters the absorber (4) through the waste heat recoverer (2) and the pressure reducing valve (3).

3. Drying apparatus according to claim 1, wherein: the refrigerant circulates through different solubility of lithium bromide solution to the refrigerant at different temperatures, so that the evaporation and condensation of the refrigerant are realized.

4. Drying apparatus according to claim 1, wherein: the low-temperature drying air channel circularly takes air as a carrier, absorbs moisture of the traditional Chinese medicinal materials in the drying box (12), and releases liquid water in the evaporator (10).

5. Drying apparatus according to claim 1, wherein: the waste heat pipeline is sequentially connected with a waste heat pipeline inlet (21), the generator (1), the heat storage water tank (16) and a waste heat pipeline outlet (22) in series, wherein the heat storage water tank (16) is filled with water, and the waste heat pipeline releases heat to lithium bromide concentrated solution of the generator (1) and the water in the heat storage water tank (16) respectively.

6. Drying apparatus according to claim 1, wherein: the cooling water pipeline is connected with a cooling water pipeline inlet (23), an absorber (4), a condenser (8), a heat storage water tank (16) and a cooling water pipeline outlet (24) in series in sequence, the cooling water pipeline absorbs heat in the absorber (4) and the condenser (8) respectively, and absorbed heat is transferred to water in the heat storage water tank (16).

7. Drying apparatus according to claim 1, wherein: the hot water pipeline is sequentially connected with a hot water pipeline inlet (25), a water injection port (15) and a heat storage water tank (16) in series, two branches are separated from the heat storage water tank (16), one branch is connected with a first stop valve (17) and a third spraying device (18) in series and used for melting frost inside the evaporator (10), and the other branch passes through the air channel (11) inside and is connected with a third stop valve (20) and passes through a hot water pipeline outlet (26) and used for utilizing process hot water.

8. Drying apparatus according to claim 7, wherein: and a third spraying device (18) in the hot water pipeline sprays the frost on the inner surface of the evaporator (10) in the form of mist liquid drops to melt the frost into liquid, the evaporator (10) is connected with a second stop valve (19) in series through a pipeline, and the liquid is used for a cooling water pipeline.

9. Drying apparatus according to claim 7, wherein: the water quantity needed by defrosting and process utilization of the evaporator (10) is supplied through a water filling port (15) on the heat storage water tank (16).

Technical Field

The invention relates to a lithium bromide-based low-temperature medicinal material drying device, and belongs to the technical field of low-temperature drying technology and waste heat utilization.

Background

In order to ensure valuable ingredients in the traditional Chinese medicinal materials, the drying temperature in the medicine process needs to be strictly and accurately controlled, and at present, the drying methods commonly used in the market comprise hot air drying, vacuum freeze drying, low-temperature drying and the like. The hot air drying method transfers heat to materials by utilizing hot air, so that water in the medicinal materials is evaporated and diffused into the air, the method is very simple, the dried medicinal materials have good appearance, but the processed medicinal materials have loss of nutrient components, and the medicinal curative effect cannot be well exerted; the vacuum freeze-drying method is that under certain conditions, solid ice generated by medicinal materials is directly sublimated to be changed into gaseous water vapor, and the treated medicinal materials have higher nutritive value and sensory quality, but the method has long operation time, large energy consumption and higher equipment investment cost, and is not beneficial to large-scale production and use; the low-temperature drying method can better preserve the shape, color, taste and drug property of the medicinal materials, and has the advantages of high efficiency, low energy consumption, short drying time and the like compared with vacuum freeze drying.

In the pharmaceutical field, active ingredients and active ingredients in medicinal products are usually obtained by organic chemical combination processes, and proper reaction conditions need to be provided for completing the processes. Larger pharmaceutical plants consume large amounts of energy to achieve reaction conditions and produce waste gases, waste waters and waste residues that pollute the ecological environment. Among them, the waste gas generated in the pharmaceutical process contains a large amount of process waste heat which cannot be directly utilized, and the waste heat is discharged into the atmospheric environment, which causes the aggravation of environmental thermal pollution. Then, the reasonable utilization of the process waste heat becomes the key for reducing the environmental temperature and improving the ecological quality.

The invention utilizes low-temperature drying technology to cool and dehumidify the air in the evaporator, the moisture in the air is adhered to the inner wall of the evaporator in the form of liquid water drops, the dried low-temperature air enters the drying box under the suction action of the fan to skim the surface of the medicinal material and take away the moisture in the medicinal material, so as to meet the moisture content requirement of the medicinal material in the preparation process.

Disclosure of Invention

The invention provides a lithium bromide-based low-temperature medicinal material drying device, which overcomes the defects of the prior art, adopts a low-temperature drying technology, prolongs the storage time of medicinal materials, greatly keeps the original appearance and quality of the medicinal materials, and simultaneously takes waste heat generated in the pharmaceutical process as energy power of a lithium bromide absorption refrigerator, fully utilizes the waste heat and promotes the cascade utilization of energy.

The invention realizes the aim through the following technical scheme: the utility model provides a based on lithium bromide low temperature medicinal material drying device which characterized in that: including lithium bromide solution circulation, refrigerant circulation and low-temperature drying air channel circulation.

The generator is connected with the waste heat pipeline in parallel in the lithium bromide solution circulation, the lithium bromide concentrated solution in the generator is heated to be heated, the refrigerant absorbs heat to be vaporized and enters the condenser, the lithium bromide concentrated solution in the generator is concentrated and sequentially passes through the waste heat recoverer, the pressure reducing valve and the absorber through pipelines, finally the lithium bromide solution in the absorber absorbs the refrigerant from the evaporator, the lithium bromide solution is diluted, and meanwhile the absorber is connected with the cooling water pipeline in parallel.

The waste heat pipeline is sequentially connected with a waste heat pipeline inlet, the generator, the heat storage water tank and a waste heat pipeline outlet in series; and the cooling water pipeline is sequentially connected with the cooling water pipeline inlet, the absorber, the condenser, the heat storage water tank and the cooling water pipeline outlet in series.

In the refrigerant circulation, the refrigerant realizes refrigeration of the refrigerant in the evaporator and heat release in the condenser through different solubility of lithium bromide solution to the refrigerant at different temperatures.

Wherein, the evaporator is connected in parallel in the low-temperature drying air channel circulation; the condenser is connected in parallel with the cooling water pipeline.

The low-temperature drying air channel circulation takes air in the air channel as a carrier to absorb moisture of medicinal materials in the drying box, the moisture content of the air passing through the drying box is increased, cooling and dehumidifying treatment is carried out in the low-temperature environment of the evaporator, the low-temperature drying air exchanges heat with the hot water pipeline, the relative humidity of the air is reduced, the water absorption capacity of the air is enhanced, and then the air enters the next drying circulation.

The evaporator is connected with a hot water pipeline in series, the hot water pipeline is sequentially connected with a hot water pipeline inlet, a water filling port and a heat storage water tank, then two branches are separated from the heat storage water tank, one branch is connected with the first stop valve and the third spraying device, and the other branch is connected with the third stop valve and a hot water pipeline outlet through an air duct.

Preferably, if only frost is formed in the evaporator, the first stop valve and the second stop valve are opened, the third stop valve is closed, and the hot water is used for melting the frost in the evaporator.

Preferably, if only process hot water is needed, the third stop valve is opened, and the first stop valve and the second stop valve are closed.

Preferably, if both evaporator defrosting and process hot water are required, the first, second and third stop valves are opened.

The lithium bromide solution circulation comprises a generator, a waste heat recoverer, a pressure reducing valve, an absorber, a first spraying device, a generator pump and a second spraying device.

The refrigerant cycle includes a generator, a condenser, an expansion valve, an evaporator, and an absorber.

The low-temperature drying air channel circulation comprises an evaporator, an air channel, a drying box and a fan.

The invention has the beneficial effects that: 1) the lithium bromide absorption refrigeration system is adopted, the process waste heat is effectively utilized, the cold quantity required by low-temperature drying is obtained, meanwhile, a hot water pipeline in an air duct is used for a reheating link after cooling and dehumidification, and no additional energy input is needed in the whole process; compared with a chlorofluorocarbon compound refrigerant adopted by a common compression type refrigerating system, the lithium bromide absorption type refrigeration adopts water as the refrigerant, does not damage the atmospheric ozone layer, is very friendly to the ecological environment, and is an energy-saving and environment-friendly refrigeration mode.

2) The low-temperature drying technology reduces the relative humidity of air, improves the capacity of absorbing the surface moisture of the traditional Chinese medicinal materials, reduces the moisture of the traditional Chinese medicinal materials to a specified content, effectively prolongs the storage time, accelerates the drying process, ensures that the traditional Chinese medicinal materials and preparations can be used in the pharmaceutical process of the next link in time, and better keeps the original appearance and quality of the traditional Chinese medicinal materials.

3) The cooling water pipeline and the waste heat pipeline are used for heating the heat storage water tank, waste heat is utilized in a gradient mode, and heat pollution to the outdoor environment is reduced.

4) The hot water pipeline is divided into two branches from the outlet of the heat storage water tank, one branch is used for causing the phenomenon of liquid water frosting due to the fact that the temperature in the evaporator is too low, and the other branch can meet the process hot water requirement.

Drawings

FIG. 1 is a schematic diagram showing the principle of the results of the present invention.

In the figure: 1. the device comprises a generator, 2, a waste heat recoverer, 3, a pressure reducing valve, 4, an absorber, 5, a first spray device, 6, a generator pump, 7, a second spray device, 8, a condenser, 9, an expansion valve, 10, an evaporator, 11, an air duct, 12, a drying box, 13, a medicinal material drying disc, 14, a fan, 15, a water filling port, 16, a heat storage water tank, 17, a first stop valve, 18, a third spray device, 19, a second stop valve, 20, a third stop valve, 21, a waste heat pipeline inlet, 22, a waste heat pipeline outlet, 23, a cooling water pipeline inlet, 24, a cooling water pipeline outlet, 25, a hot water pipeline inlet, 26 and a hot water pipeline outlet.

Detailed Description

The present invention is further explained with reference to the attached drawings, it is to be noted that the following detailed description is provided for further explanation of the present invention, and should not be construed as limiting the scope of the present invention, and those skilled in the art can make modifications and adaptations of the present invention based on the above-mentioned contents.

As shown in fig. 1, a low-temperature medicinal material drying device based on lithium bromide comprises: lithium bromide solution circulation, refrigerant circulation and low-temperature drying air channel circulation.

The lithium bromide solution circulation comprises a generator 1, a waste heat recoverer 2, a pressure reducing valve 3, an absorber 4, a first spraying device 5, a generator pump 6 and a second spraying device 7; wherein the generator 1 has a lithium bromide concentrated solution and the absorber 4 has a lithium bromide dilute solution; the generator 1 is sequentially connected with a waste heat recoverer 2, a pressure reducing valve 3, an absorber 4, a first spraying device 5, a generator pump 6, the waste heat recoverer 2, the generator 1 and a second spraying device 7 in series to form a closed loop; meanwhile, the generator 1 is connected in parallel with a waste heat pipeline, and the absorber 4 is connected in parallel with a cooling water pipeline; the generator 1 in the lithium bromide solution circulation absorbs waste heat, the refrigerant is heated and vaporized and is separated from the lithium bromide concentrated solution, so that the refrigerant and the lithium bromide solution are respectively circulated from two branches in the generator 1, and therefore, the lithium bromide solution circulation and the refrigerant circulation form a parallel loop.

The waste heat pipeline is sequentially connected with a waste heat pipeline inlet 21, the generator 1, the heat storage water tank 16 and a waste heat pipeline outlet 22 in series; the hot water storage tank 16 is filled with water; the waste heat pipeline respectively releases heat in the lithium bromide concentrated solution of the generator 1 and the water in the heat storage water tank 16; the cooling water line is connected in series with the cooling water line inlet 23, the absorber 4, the condenser 8, the heat storage water tank 16 and the cooling water line outlet 24 in sequence, and the cooling water line absorbs heat in the absorber 4 and the condenser 8 respectively and transfers the absorbed heat to the water in the heat storage water tank 16.

The refrigerant cycle comprises a generator 1, a condenser 8, an expansion valve 9, an evaporator 10 and an absorber 4; the generator 1 is connected with a condenser 8, an expansion valve 9, an evaporator 10 and an absorber 4 in series in sequence to form a closed loop; meanwhile, the condenser 8 is also connected in parallel to a cooling water pipeline, and the evaporator 10 is also connected in parallel to a low-temperature drying air duct for circulation.

The low-temperature drying air duct circulation comprises; the system comprises an evaporator 10, an air duct 11, a drying box 12 and a fan 14, wherein the evaporator 10 is sequentially connected with the drying box 12 and the fan 14 in series through the air duct 11 to form a closed loop; while the evaporator 10 is connected in series to the hot water line.

The hot water pipeline is sequentially connected with a hot water pipeline inlet 25, a water injection port 15 and a heat storage water tank 16, then the hot water pipeline is divided into two branches, one branch is connected with the first stop valve 17 and the third spraying device 18 in series and used for defrosting of the evaporator 10, and the other branch is connected with the third stop valve 20 and a hot water pipeline outlet 26 through the air duct 11 and used for utilizing process waste heat.

Further, the amount of water required for defrosting and process utilization in the evaporator 10 is supplied through a water filling port 15 on the hot water storage tank 16.

The working principle and the process thereof are as follows: the lithium bromide concentrated solution in the generator 1 is heated by the waste heat, the lithium bromide solution is separated from the refrigerant due to the difference of the boiling points of the lithium bromide solution and the refrigerant, the refrigerant escapes from the lithium bromide concentrated solution in a gas form and enters the condenser 8, the concentrated high-temperature lithium bromide concentrated solution enters the waste heat recoverer 2 to exchange heat with the dilute solution from the absorber 4, the refrigerant is decompressed by a decompression valve 3, reaches an absorber 4, is sprayed on a cooling water pipeline in the form of mist liquid drops by a first spraying device 5, absorbs the refrigerant from an evaporator 10, is diluted into dilute solution, and after the lithium bromide dilute solution is boosted by a generator pump 6, exchanging heat with the high-temperature lithium bromide concentrated solution from the generator 1 through the waste heat recoverer 2, finally entering a second spraying device 7 in the generator 1, spraying the waste heat pipeline in the form of mist liquid drops to complete the circulation of the lithium bromide solution.

Meanwhile, the lithium bromide concentrated solution in the generator 1 absorbs the heat of the waste heat pipeline, the generated high-temperature and high-pressure gaseous refrigerant enters the condenser 8 and is condensed into liquid in the condenser 8, the refrigerant is decompressed and throttled by the expansion valve 9 and enters the evaporator 10, heat exchange is carried out between the refrigerant and air through the evaporator 10, the heat of the air is absorbed and vaporized, and finally the refrigerant enters the absorber 4 and is absorbed by the lithium bromide dilute solution in the absorber, so that the refrigerant circulation is completed.

Air with high moisture content enters the evaporator 10 through the air duct 11 to perform indirect heat exchange with a refrigerant, the air temperature is reduced, water is separated from the air and is collected in the evaporator 10, the air subjected to temperature reduction and drying is subjected to heat exchange with one branch of a hot water pipeline, after the air is reheated, the water absorption capacity of the air is enhanced, the air enters the drying box 12 to absorb moisture of medicinal materials, the moisture content is increased, and the circulation of a low-temperature drying air duct is completed under the suction action of the fan 14.

Further, if the temperature inside the evaporator 10 is too low, and the water in the evaporator 10 is too cold to form large-area frost formation, the first stop valve 17 and the second stop valve 19 are opened, the third stop valve 20 is closed, hot water flows out of the heat storage water tank 16 and enters the third spraying device 18 to be sprayed out in the form of mist liquid drops, the frost is absorbed and melted into low-temperature liquid, and the second stop valve 19 is opened to be used for a cooling water pipeline, so that the problem of frost formation of the evaporator is solved; if process hot water is required to be provided, the third stop valve 20 is opened, the first stop valve 17 and the second stop valve 19 are closed, and the hot water flows out of the heat storage water tank 16 and flows into each process hot water utilization link through the third stop valve 20 and the hot water pipeline outlet 26; if both defrosting of the evaporator 10 and process utilization are required, the first, second and third shut-off valves 17, 19 and 20 are opened.

Further, if the amount of water in the hot water storage tank 16 is not enough to supply the medicinal material drying apparatus of the present application, water supply is performed through the water injection port 15 on the hot water storage tank 16.

The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.