阅读说明：本技术 一种蒸汽压缩型吸收式热泵 (Steam compression type absorption heat pump ) 是由 孙健 霍成 马世财 戈志华 杜小泽 杨勇平 于 2019-09-10 设计创作，主要内容包括：本发明提出一种高效的回收工业余热的热量用于加热热水的热泵机组,内部采用两种循环工质实现制冷剂的内部交换,并同时使用压气机提升吸收器的溶液吸收效果,其中压气机采用多级叶片方式,相比现有热泵技术而言,可以实现制热温度的大幅度提升,更为充分的回收工业余热,进而具有显著的节能减排技术优势。(The invention provides a heat pump unit for efficiently recovering heat of industrial waste heat to heat hot water, wherein two circulating working media are adopted inside the heat pump unit to realize internal exchange of refrigerants, and a gas compressor is used for improving the solution absorption effect of an absorber, wherein the gas compressor adopts a multi-stage blade mode.)

1. A vapor compression type absorption heat pump is characterized in that: the device comprises an absorber (1), an evaporator (2), a refrigerant gasification section (3), a refrigerant condensation section (4), a generator (5), a condenser (6), a compressor (7), a solution heat exchanger (8), a solution heat exchanger (9), a circulating pump (10), a circulating pump (11), a circulating pump (12), a circulating pump (13), a circulating pump (14), a hot water inlet (15), a hot water outlet (16), a waste heat outlet (17), a waste heat inlet (18), a cold water inlet (19), a cold water outlet (20), a valve (21) and a valve (22).

In the vapor compression absorption heat pump, an absorber (1) is connected with a solution heat exchanger (8), a hot water inlet (15) and a hot water outlet (16); the evaporator (2) is connected with the waste heat outlet (17), the circulating pump (10) and the refrigerant gasification section (3); the refrigerant gasification section (3) is connected with the solution heat exchanger (8), the circulating pump (11), the evaporator (2) and the generator (5); the refrigerant condensing section (4) is connected with the solution heat exchanger (9), the circulating pump (12), the cold water inlet (19) and the condenser (6); the condenser (6) is connected with the valve (22), the cold water outlet (20) and the circulating pump (14); the generator (5) is connected with the solution heat exchanger (9), the circulating pump (13), the refrigerant gasification section (3) and the waste heat inlet (18).

According to the vapor compression type absorption heat pump, hot water is heated in an absorber (1), waste heat fluid is cooled step by step sequentially through a generator (5), a refrigerant gasification section (3) and an evaporator (2), cold water is heated and leaves after passing through a refrigerant condensation section (4) and a condenser (6) in parallel, and the flow rates of the cold water entering the refrigerant condensation section (4) and the condenser (6) are adjusted by controlling the opening degrees of a valve (21) and a valve (22).

The vapor compression absorption heat pump simultaneously adopts two circulating working medium pairs, wherein the two working medium pairs are different in absorbent and same in refrigerant. The medium A and the medium B form a solution C, the medium A and the medium D form a solution E, wherein the medium A is a refrigerant, the medium B and the medium C are absorbents, the solution C circulates between the absorber (1) and the refrigerant gasification section (3), and the solution E circulates between the refrigerant condensation section (4) and the generator (5).

According to the vapor compression type absorption heat pump, a high-concentration solution C absorbs refrigerant A steam from an evaporator (2) in an absorber (1), releases heat to heat hot water, the solution C which is changed into a low-concentration solution C enters a refrigerant gasification section (3) after passing through a solution heat exchanger (8), the low-concentration solution C is heated by waste heat fluid to generate refrigerant A steam, the refrigerant steam A enters a refrigerant condensation section (4), and the low-concentration solution C which is changed into a high-concentration solution C sequentially passes through a circulating pump (11) and the solution heat exchanger (8) and then enters the absorber (1); the refrigerant A steam in the refrigerant condensation section (4) is condensed into liquid and then enters a high-concentration solution E, the solution E is diluted and then sequentially enters a circulating pump (12) and a solution heat exchanger (9) and then enters a generator (5), the low-concentration solution E is heated by waste heat fluid and then is boiled and concentrated, the generated high-concentration solution E sequentially passes through the circulating pump (13) and the solution heat exchanger (9) and then enters the refrigerant condensation section (4), meanwhile, the refrigerant steam A generated by the solution enters a condenser (6) and then is cooled by cold water and then is condensed into liquid, the liquid refrigerant A further passes through the circulating pump (14) and enters an evaporator (2), and the refrigerant steam is converted into spray evaporation through the circulating pump (10).

According to the steam compression type absorption heat pump, the absorber (1) and the evaporator (2) share one space.

According to the steam compression type absorption heat pump, the refrigerant gasification section (3) and the refrigerant condensation section (4) share one space, and the air compressor (7) is arranged in the middle of the space and used for improving the gasification and condensation effects of the refrigerant.

According to the steam compression type absorption heat pump, the condenser (6) and the generator (5) share one space.

2. The vapor compression-type absorption heat pump according to claim 1, wherein: refrigerant exchange between different circulating working medium pairs is realized in the refrigerant gasification section (3) and the refrigerant condensation section (4).

3. The vapor compression-type absorption heat pump according to claim 1, wherein: the absorbent in the working medium is inorganic salt, alcohols and Freon.

4. The vapor compression-type absorption heat pump according to claim 1, wherein: the air compressor adopts a multi-blade (2 or more) fan.

5. The vapor compression-type absorption heat pump according to claim 1, wherein: the hot water comes from civil heat supply pipelines or hot water or steam pipelines for process production, and the cold water comes from cooling towers, underground water, rivers, lakes and seas or industrial production process discharge.

Technical Field

The invention belongs to the technical field of energy utilization, and particularly relates to a heat pump technology for recovering industrial waste heat to raise the temperature of hot water.

Background

In the field of energy utilization, there is a wide range of heat exchange processes, and the heat transfer process can be generalized to transfer from a high temperature fluid to a low temperature fluid or from a low temperature fluid to a high temperature fluid. According to Newton's second law, heat can be spontaneously transferred from a high-temperature object to a low-temperature object only by using a common heat exchanger; if heat needs to be transferred from a low-temperature object to a high-temperature object, certain cost needs to be consumed, a certain amount of high-grade energy such as electric power, high-temperature steam or hot water needs to be consumed, and a heat pump, an injection device and the like need to be used. In the prior art, the heat pump technology has been accepted and applied in the market due to its high efficiency and reliability. The heat pump technology is divided into an absorption heat pump or a compression heat pump according to the principle, wherein the absorption heat pump is divided into a first absorption heat pump and a second absorption heat pump, the first absorption heat pump needs to consume high-grade energy to transmit a large amount of heat of a low-temperature object to a high-temperature object and is also called a heat-increasing heat pump, the second heat pump needs to consume no high-grade energy and needs a cold source with lower temperature than the low-temperature object, and a small amount of heat of the low-temperature object is extracted to continuously increase the temperature of the high-temperature object and is also called a heat-increasing heat pump. The second type of absorption heat pump requires lower grade cold water, and then completes internal circulation by using the temperature difference between the waste heat and the cold water to heat hot water. However, in the second-class absorption heat pump technology reported in the prior art, the temperature rise of hot water is limited due to the influence of internal thermodynamic cycle and physical properties of working media, and thus the requirement of obtaining 'large temperature rise' of hot water is difficult to meet.

In order to solve the technical problem, the invention provides an absorption heat pump unit adopting refrigerant vapor exchange and refrigerant vapor compression, and the outlet temperature of the hot water side is obviously improved.

Disclosure of Invention

In order to recover industrial waste heat to realize the purpose of heat exchange of large temperature rise at a hot water side, the heat pump adopts a flow of a refrigerant vapor exchanger and a refrigerant vapor compression fan. The heat pump comprises an absorber 1, an evaporator 2, a refrigerant gasification section 3, a refrigerant condensation section 4, a generator 5, a condenser 6, a compressor 7, a solution heat exchanger 8, a solution heat exchanger 9, a circulating pump 10, a circulating pump 11, a circulating pump 12, a circulating pump 13, a circulating pump 14, a hot water inlet 15, a hot water outlet 16, a waste heat outlet 17, a waste heat inlet 18, a cold water inlet 19, a cold water outlet 20, a valve 21 and a valve 22.

According to the vapor compression type absorption heat pump, hot water is heated in an absorber 1, waste heat fluid is cooled step by step sequentially through a generator 5, a refrigerant gasification section 3 and an evaporator 2, cold water is connected in parallel and is heated through a refrigerant condensation section 4 and a condenser 6 and then leaves, and the flow rates of the cold water entering the refrigerant condensation section 4 and the condenser 6 are adjusted through the opening degrees of a control valve 21 and a valve 22.

In the vapor compression absorption heat pump, an absorber 1 is connected with a solution heat exchanger 8, a hot water inlet 15 and a hot water outlet 16; the evaporator 2 is connected with a waste heat outlet 17, a circulating pump 10 and a refrigerant gasification section 3; the refrigerant gasification section 3 is connected with the solution heat exchanger 8, the circulating pump 11, the evaporator 2 and the generator 5; the refrigerant condensing section 4 is connected with the solution heat exchanger 9, the circulating pump 12, the cold water inlet 19 and the condenser 6; the condenser 6 is connected with a valve 22, a cold water outlet 20 and a circulating pump 14; the generator 5 is connected with the solution heat exchanger 9, the circulating pump 13, the refrigerant gasifying section 3 and the waste heat inlet 18.

The vapor compression absorption heat pump simultaneously adopts two circulating working medium pairs, wherein the two working medium pairs are different in absorbent and same in refrigerant. The medium A and the medium B form a solution C, the medium A and the medium D form a solution E, wherein the medium A is a refrigerant, the medium B and the medium C are absorbents, the solution C circulates between the absorber 1 and the refrigerant gasification section 3, and the solution E circulates between the refrigerant condensation section 4 and the generator 5.

In the vapor compression type absorption heat pump, a high-concentration solution C absorbs refrigerant A steam from an evaporator 2 in an absorber 1, releases heat to heat hot water, the solution C which is changed into a low-concentration solution C enters a refrigerant gasification section 3 after passing through a solution heat exchanger 8, the low-concentration solution C is heated by waste heat fluid to generate refrigerant A steam, the refrigerant steam A enters a refrigerant condensation section 4, and the low-concentration solution C which is changed into a high-concentration solution C enters the absorber 1 after sequentially passing through a circulating pump 11 and the solution heat exchanger 8; the refrigerant A steam in the refrigerant condensation section 4 is condensed into liquid and then enters a high-concentration solution E, the solution E is diluted and then sequentially enters a circulating pump 12 and a solution heat exchanger 9 and then enters a generator 5, the low-concentration solution E is heated by waste heat fluid and then is boiled and concentrated, the generated high-concentration solution E sequentially passes through a circulating pump 13 and the solution heat exchanger 9 and then enters the refrigerant condensation section 4, meanwhile, the refrigerant steam A generated by the solution enters a condenser 6 and then is cooled by cold water and then is condensed into liquid, the liquid refrigerant A further enters an evaporator 2 through a circulating pump 14, and the refrigerant steam is converted into refrigerant steam through spraying and evaporation through a circulating pump 10.

In the vapor compression absorption heat pump, the absorber 1 and the evaporator 2 share one space.

According to the vapor compression type absorption heat pump, the refrigerant gasification section 3 and the refrigerant condensation section 4 share one space, refrigerant vapor generated by the refrigerant gasification section 3 is compressed by the air compressor 7, the pressure of the compressed refrigerant vapor is increased, the compressed refrigerant vapor enters the refrigerant condensation section 4 and is condensed, and the air compressor 7 achieves the effect of the pressure increase of the vapor stripping of the refrigerant and is driven by the motor.

In the vapor compression absorption heat pump, the condenser 6 and the generator 5 share a space.

According to the steam compression type absorption heat pump, hot water is from a civil heat supply pipeline or hot water or steam pipeline for process production, and cold water is from a cooling tower, underground water, rivers, lakes and seas or industrial production process discharge.

The heat pump adopts refrigerant vapor exchange and refrigerant vapor compression, can remarkably improve the temperature rise amplitude of hot water and the temperature reduction amplitude of waste heat fluid, and simultaneously improves the efficiency of the heat exchanger. Firstly, a refrigerant vapor exchange mode is adopted to improve the concentration of the solution at the inlet of the absorber 1, so that the effect of the solution for absorbing the refrigerant vapor is enhanced; and secondly, a compressor 7 is arranged between the evaporator 2 and the absorber 1, and the solution absorption effect in the absorber is obviously improved by improving the pressure of refrigerant steam. In conclusion, the heat exchange capacity of the absorber 1 is significantly increased, so that the outlet temperature of the hot water is raised.

Drawings

Fig. 1 is a flow diagram of a vapor compression-type absorption heat pump.

Reference numerals: 1-absorber, 2-evaporator, 3-refrigerant gasification section, 4-refrigerant condensation section, 5-generator, 6-condenser, 7-compressor, 8-solution heat exchanger, 9-solution heat exchanger, 10-circulating pump, 11-circulating pump, 12-circulating pump, 13-circulating pump, 14-circulating pump, 15-hot water inlet, 16-hot water outlet, 17-waste heat outlet, 18-waste heat inlet, 19-cold water inlet, 20-cold water outlet, 21-valve, 22-valve.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to fig. 1 in the embodiments of the present invention. In fig. 1, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The heat pump adopts a lithium bromide methanol solution and a lithium iodide methanol solution, wherein lithium bromide in the lithium bromide methanol solution is used as an absorbent, and methanol is used as a refrigerant; lithium iodide in the lithium iodide methanol solution is used as an absorbent, and methanol is used as a refrigerant. The heat pump comprises an absorber 1, an evaporator 2, a refrigerant gasification section 3, a refrigerant condensation section 4, a generator 5, a condenser 6, a compressor 7, a solution heat exchanger 8, a solution heat exchanger 9, a circulating pump 10, a circulating pump 11, a circulating pump 12, a circulating pump 13, a circulating pump 14, a hot water inlet 15, a hot water outlet 16, a waste heat outlet 17, a waste heat inlet 18, a cold water inlet 19 and a cold water outlet.

The heat pump is used for heating hot water and cold water by recovering heat of waste heat, wherein the hot water is from a return water pipeline of a heating system, the cold water is from underground water, and the waste heat water is discharged from a production process. Wherein hot water is heated in the absorber 1, the waste heat fluid is cooled gradually and then leaves after sequentially passing through the generator 5, the refrigerant gasification section 3 and the evaporator 2, and cold water is heated and then leaves after simultaneously passing through the refrigerant condensation section 4 and the condenser 6.

The connection mode of each part in the heat pump is as follows: the absorber 1 is connected with a solution heat exchanger 8, a hot water inlet 15 and a hot water outlet 16; the evaporator 2 is connected with a waste heat outlet 17, a circulating pump 10 and a refrigerant gasification section 3; the refrigerant gasification section 3 is connected with the solution heat exchanger 8, the circulating pump 11, the evaporator 2 and the generator 5; the refrigerant condensing section 4 is connected with the solution heat exchanger 9, the circulating pump 12, the cold water inlet 19 and the condenser 6; the condenser 6 is connected with a valve 22, a cold water outlet 20 and a circulating pump 14; the generator 5 is connected with the solution heat exchanger 9, the circulating pump 13, the refrigerant gasifying section 3 and the waste heat inlet 18.

The working mode of the heat pump is as follows: the lithium bromide concentrated solution absorbs methanol vapor from the evaporator 2 in the absorber 1, releases heat to heat hot water, becomes a lithium bromide dilute solution, enters the refrigerant gasification section 3 after passing through the solution heat exchanger 8, the lithium bromide dilute solution is heated by waste heat fluid from the waste heat outlet 17 to generate methanol vapor, the methanol vapor enters the refrigerant condensation section 4, and meanwhile, the lithium bromide dilute solution becomes a lithium bromide concentrated solution, and enters the absorber 1 after sequentially passing through the circulating pump 11 and the solution heat exchanger 8; the concentration of lithium iodide solution in the refrigerant condensation section 4 is reduced after the methanol vapor is condensed into liquid, the generated lithium iodide dilute solution sequentially enters a circulating pump 12 and a solution heat exchanger 9 and then enters a generator 5, the lithium iodide dilute solution is heated by waste heat fluid and then is boiled and concentrated, the generated lithium iodide concentrated solution sequentially passes through a circulating pump 13 and the solution heat exchanger 9 and then enters the refrigerant condensation section 4, meanwhile, the methanol vapor generated by boiling of the lithium iodide solution enters a condenser 6 and then is cooled by cold water and then is condensed into liquid, the liquid methanol further enters an evaporator 2 through a circulating pump 14, and the methanol vapor is converted into the methanol vapor through spraying and evaporation by a circulating pump 10.

In the vapor compression absorption heat pump, an absorber 1 and an evaporator 2 share a space, wherein the absorber 1 is positioned at the upper part, and the evaporator 2 is positioned at the lower part.

According to the steam compression type absorption heat pump, the refrigerant gasification section 3 and the refrigerant condensation section 4 share one space, methanol steam generated by the refrigerant gasification section 3 is compressed by the air compressor 7 and then enters the refrigerant condensation section 4 to be condensed and continuously circulated, the air compressor 7 is installed in the middle of the space, the air compressor 7 is driven by the motor and adopts six trailing blades.

In the vapor compression absorption heat pump, the condenser 6 and the generator 5 share one cavity.

Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.