CN113757841B - Low-grade heat step driving heat and humidity decoupling processing air conditioning system - Google Patents
Low-grade heat step driving heat and humidity decoupling processing air conditioning system Download PDFInfo
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- CN113757841B CN113757841B CN202110952367.3A CN202110952367A CN113757841B CN 113757841 B CN113757841 B CN 113757841B CN 202110952367 A CN202110952367 A CN 202110952367A CN 113757841 B CN113757841 B CN 113757841B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0014—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using absorption or desorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
Abstract
The invention relates to a low-grade heat step driving heat and humidity decoupling processing air conditioning system which comprises a generator, a first condenser, an evaporator, an absorber, a surface cooler, a first solution-solution heat exchanger, a vacuum regenerator, a second condenser, a second solution-solution heat exchanger and a dehumidifier, wherein the first condenser is connected with the evaporator; a generator solution outlet is connected with the vacuum regenerator and is used as a driving heat source of the vacuum regenerator solution, then the generator solution is discharged from the vacuum regenerator and is connected with the first solution-solution heat exchanger, and the generator solution is discharged from the first solution-solution heat exchanger and enters the absorber; low-grade heat firstly enters the generator, and then enters the vacuum regenerator after being discharged from the generator, so that the gradient utilization of the heat energy is realized. The invention is applied to the working condition that the driving heat source is below 80 ℃, can realize the cascade utilization of low-grade heat, can realize the heat-moisture decoupling treatment of air at the tail end, and can further improve the system performance by taking the heat of the solution at the outlet of the generator as the driving heat source of the regenerator.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a low-grade heat step driving heat and humidity decoupling processing air conditioning system.
Background
A large amount of waste heat exists in an industrial factory building, waste heat resources above 90 ℃ can be effectively utilized, wherein the waste heat at 90 ℃ can be used for driving a single-effect absorption refrigeration system, the waste heat resources at 80 ℃ need to adopt two-stage absorption refrigeration with lower efficiency, and the efficiency is only about 0.4. Therefore, how to efficiently utilize low-grade heat energy below 80 ℃ becomes an important technical problem.
In a high-temperature and high-humidity industrial factory building, because the area is large, the production environment is improved by adopting a station air supply mode, the energy consumption is higher by adopting a traditional compression type refrigerating system, and for a factory with a heat source condition, the absorption type refrigerating system only consumes some power of a transmission pump and a distribution pump, so that the power consumption is very low, and the absorption type refrigerating system becomes a better choice. For the working condition that the waste heat resource is below 80 ℃, the combination of solution dehumidification and absorption refrigeration is a better way, so that the absorption refrigeration only bears sensible heat load, the solution dehumidification bears moisture load, the treatment mode can effectively improve the evaporation temperature of the absorption refrigeration, and the COP of the system can keep a higher level. In the prior art, in a system combining solution dehumidification and absorption refrigeration, the utilization temperature difference of hot water is generally about 10 ℃, and deep utilization cannot be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a low-grade heat step driving heat and humidity decoupling processing air conditioning system, which aims to solve the technical problems that low-grade heat below 80 ℃ is difficult to utilize and cannot be deeply utilized and the heat utilization efficiency is low.
The technical scheme adopted by the invention is as follows:
a low-grade heat step driving heat and humidity decoupling processing air conditioning system comprises an absorption refrigeration module and a solution dehumidification module;
the absorption refrigeration module comprises a generator, a first condenser, a throttle valve, an evaporator, an absorber, a first solution-solution heat exchanger and a surface cooler; the generator uses external first-grade low-grade heat as a driving heat source, so that refrigerant water sequentially passes through the generator, the first condenser, the throttle valve and the evaporator and then enters the absorber to form a refrigerant water passage;
the absorber dilutes a first concentrated solution in the absorber into a first dilute solution by using refrigerant vapor, the first solution-solution heat exchanger is used for heating the first dilute solution, the generator concentrates the heated first dilute solution into the first concentrated solution by using the first-stage low-grade heat through heat exchange, the first concentrated solution is used as a heat source by the solution dehumidification module, and then the first concentrated solution is cooled by the first solution-solution heat exchanger and enters the absorber to form a first solution circulation loop;
the solution dehumidifying module comprises a vacuum regenerator, a second condenser, a second solution-solution heat exchanger, a solution-water heat exchanger and a dehumidifier; the vacuum regenerator concentrates a second dilute solution in the vacuum regenerator into a second concentrated solution through heat exchange, wherein a heat exchange heat source is heat from the first concentrated solution and secondary low-grade heat generated after the heat release of the primary low-grade heat;
the second solution-solution heat exchanger and the solution-water heat exchanger sequentially cool the second concentrated solution, the dehumidifier dehumidifies external air by using the cooled second concentrated solution to generate a second dilute solution, and the second solution-solution heat exchanger heats at least one part of the second dilute solution and then sends the heated part of the second dilute solution to the vacuum regenerator for regeneration to form a second solution circulation loop.
The further technical scheme is as follows:
a first heat exchange coil, a second heat exchange coil and a spray pipe are arranged in the vacuum regenerator, and the spray pipe and the coil pipe are also arranged in the generator;
the first-stage low-grade heat outlet is connected with a coil inlet of the generator, a coil outlet of the generator is connected with a first heat exchange coil inlet, and a low-grade heat source which is subjected to two-stage utilization is discharged from the first heat exchange coil outlet.
The concentrated solution outlet of the generator for discharging the first concentrated solution is connected with the second inlet of the heat exchange coil, the second outlet of the heat exchange coil is connected with the first concentrated solution inlet of the first solution-solution heat exchanger, the first concentrated solution outlet of the first solution-solution heat exchanger is connected with the solution inlet of the absorber, the solution outlet of the absorber is connected with the first dilute solution inlet of the first solution-solution heat exchanger through the first solution pump, and the first dilute solution outlet of the first solution-solution heat exchanger is connected with the spray pipe inlet of the generator.
The second solution-solution heat exchanger heats part of the second dilute solution and then sends the part of the second dilute solution to the vacuum regenerator for regeneration; the solution-water heat exchanger mixes and cools another portion of the second dilute solution with the second concentrated solution, and then sends the mixture to the dehumidifier for dehumidifying external air.
And a second dilute solution outlet of the second solution-solution heat exchanger is connected with a spray pipe inlet of the vacuum regenerator through a pressure reducing valve, and a solution outlet of the vacuum regenerator is connected with a second concentrated solution inlet of the second solution-solution heat exchanger through a second solution pump.
And the steam outlet of the vacuum regenerator is connected with the inlet of the second condenser.
The primary low-grade heat is hot water with the temperature of 70-80 ℃, and drives an evaporator of the absorption refrigeration module to provide high-temperature cold water with the temperature of 12-18 ℃ for the surface air cooler, so that the air is cooled; the temperature of the secondary low-grade heat obtained after the primary low-grade heat releases heat is 55-70 ℃, and the secondary low-grade heat drives the solution dehumidifying module to remove the moisture load of air.
Specifically, a solution outlet of the dehumidifier is connected with a second dilute solution inlet of a second solution-solution heat exchanger through a branch pipe, and is connected with a solution inlet of the solution-water heat exchanger after being converged with a second concentrated solution outlet pipeline of the second solution-solution heat exchanger through another branch pipe, and a solution outlet of the solution-water heat exchanger is connected with the solution inlet of the dehumidifier.
Specifically, a refrigerant water vapor inlet of the absorber is connected with a refrigerant water outlet of the evaporator, a refrigerant inlet of the evaporator is connected with an outlet of the first condenser through the throttle valve, and an inlet of the first condenser is connected with a high-temperature vapor outlet of the generator.
Specifically, a high-temperature cold water heat exchange tube is arranged in the evaporator, a cold end outlet of the high-temperature cold water heat exchange tube is connected with an inlet of the surface air cooler, and a hot end inlet of the high-temperature cold water heat exchange tube is connected with an outlet of the surface air cooler; and the surface cooler is used for exchanging heat between the air dehumidified by the dehumidifier and high-temperature cold water and reducing the temperature.
The invention has the following beneficial effects:
the invention effectively reduces the temperature of the driving heat source and improves the system performance by combining the absorption refrigeration and the solution dehumidification depth, adopting the heat-moisture decoupling treatment to the air, adopting the solution of the absorption refrigeration generator as the driving heat source for solution regeneration in the solution dehumidification and the like. The method has the following specific advantages:
1. the invention can realize gradient deep utilization of heat energy, provides high-temperature cold water at 12-18 ℃ for cooling air by using the low-grade heat-driven absorption refrigeration module at the temperature range of 80-70 ℃, and removes the moisture load of the air by using the low-grade heat-driven solution dehumidification module at the temperature range of 70-55 ℃ to realize heat and moisture decoupling treatment.
2. According to the invention, the concentrated solution at the generator outlet of the absorption refrigeration module is used for driving the vacuum regenerator of the solution dehumidification module, the temperature of the concentrated solution at the generator outlet can reach 70 ℃, which is enough to be used as a driving heat source of the vacuum regenerator, and the heat consumption of a hot water side can be effectively reduced, thereby improving the system performance.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1. a generator; 2. a first condenser; 3. a throttle valve; 4. an evaporator; 5. an absorber; 6. a first solution-to-solution heat exchanger; 7. a surface cooler; 8. a first solution pump; 9. a first water pump; 10. a vacuum regenerator; 11. a second condenser; 12. a second water pump; 13. a valve; 14. a second solution pump; 15. a second solution-to-solution heat exchanger; 16. a solution-water heat exchanger; 17. a dehumidifier; 18. a third solution pump; 19. a pressure reducing valve; 20. a first heat exchange coil; 21. a second heat exchange coil;
s1, outlet of concentrated solution; s2, a first concentrated solution inlet; s3, a first concentrated solution outlet; s4, first dilute solution inlet; s5, a first dilute solution outlet; s6, a second concentrated solution inlet s7 and a second concentrated solution outlet; s8, a second dilute solution inlet; s9, a second dilute solution outlet; z1, high-temperature steam channel; z2, low temperature steam channel; z3, medium temperature steam channel; HW1, first grade low grade heat export.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The low-grade heat step driving heat and humidity decoupling processing air conditioning system of the embodiment comprises an absorption refrigeration module I and a solution dehumidification module II, as shown in a figure I;
the absorption refrigeration module I comprises a generator 1, a first condenser 2, a throttle valve 3, an evaporator 4, an absorber 5, a first solution-solution heat exchanger 6 and a surface cooler 7;
the generator 1 uses external first-grade low-grade heat as a driving heat source, so that refrigerant water sequentially passes through the generator 1, the first condenser 2, the throttle valve 3 and the evaporator 4 and then enters the absorber 5 to form a refrigerant water passage; the second-stage low-grade heat after the heat release of the first-stage low-grade heat is reused by the solution dehumidification module II:
the absorber 5 dilutes the first concentrated solution in the absorber into a first dilute solution by using refrigerant vapor, the first solution-solution heat exchanger 6 is used for heating the first dilute solution, the generator 1 concentrates the heated first dilute solution into the first concentrated solution by using primary low-grade heat through heat exchange, the first concentrated solution is used as a heat source to be utilized by the solution dehumidification module, and then the first concentrated solution enters the absorber 5 after being cooled by the first solution-solution heat exchanger 6 to form a first solution circulation loop;
the solution dehumidifying module II comprises a vacuum regenerator 10, a second condenser 11, a second solution-solution heat exchanger 15, a solution-water heat exchanger 16 and a dehumidifier 17;
the vacuum regenerator 10 concentrates the second dilute solution inside it into a second concentrated solution by heat exchange, wherein the heat source for the heat exchange comes from two parts: the heat of the first concentrated solution and the secondary low-grade heat after the heat release of the primary low-grade heat;
the second solution-solution heat exchanger 15 and the solution-water heat exchanger 16 sequentially cool the second concentrated solution, the dehumidifier 17 dehumidifies the external air by using the cooled second concentrated solution to generate a second dilute solution, and the second solution-solution heat exchanger 15 heats at least a part of the second dilute solution and then sends the heated second dilute solution to the vacuum regenerator 10 for regeneration to form a second solution circulation loop.
In the above embodiment, the vacuum regenerator 10 is provided with the first heat exchange coil 20, the second heat exchange coil 21 and the spray pipe; a spray pipe and a coil pipe are also arranged in the generator 1;
the first heat exchange coil 20 and the second heat exchange coil 21 are respectively used for conveying the two heat exchange heat sources.
Wherein, the connection structure of the external low-grade heat source path side:
the first-stage low-grade heat outlet HW1 is connected with a coil inlet of the generator 1, a coil outlet of the generator 1 is connected with an inlet of the first heat exchange coil 20, and a low-grade heat source which is utilized by two stages is discharged from an outlet of the first heat exchange coil 20.
The connection structure of the first solution circulation loop side:
a concentrated solution outlet s1 of the generator 1 for discharging a first concentrated solution is connected with an inlet of a second heat exchange coil 21, an outlet of the second heat exchange coil 21 is connected with a first concentrated solution inlet s2 of the first solution-solution heat exchanger 6, a first concentrated solution outlet s3 of the first solution-solution heat exchanger 6 is connected with a solution inlet of the absorber 5, a solution outlet of the absorber 5 is connected with a first dilute solution inlet s4 of the first solution-solution heat exchanger 6 through a first solution pump 8, and a first dilute solution outlet s5 of the first solution-solution heat exchanger 6 is connected with a spray pipe inlet of the generator 1. The first dilute solution is sprayed on a coil pipe in the generator 1 for concentration and regeneration to form the first concentrated solution.
Wherein, the connection structure of the refrigerant passage side:
the refrigerant water vapor inlet of the absorber 5 is connected with the refrigerant water outlet of the evaporator 4, the refrigerant inlet of the evaporator 4 is connected with the outlet of the first condenser 2 through the throttle valve 3, and the inlet of the first condenser 2 is connected with the high-temperature vapor outlet of the generator 1 through the high-temperature vapor pipeline Z1.
Wherein, a coil pipe is arranged in the absorber 5, and circulating cooling water is introduced into the coil pipe.
Wherein, the high-temperature steam generated in the generator 1 is conveyed to the first condenser 2 through the high-temperature steam pipeline Z1 for condensation. Specifically, the first condenser 2 is a coil-type condensing heat exchanger, and circulating cooling water is introduced into a coil.
In the above embodiment, the solution dehumidification module further comprises a second condenser 11, and the steam outlet of the vacuum regenerator 10 is connected to the inlet of the second condenser 11 through the medium temperature steam channel Z3.
Wherein, the second condenser 11 is a coil pipe type condensing heat exchanger, circulating cooling water is introduced into the coil pipe, medium temperature steam formed in the vacuum regenerator 10 is condensed into condensed water in the second condenser 11 through exchanging with the coil pipe, and the condensed water is discharged through a valve 13 by a second water pump 12.
Wherein, the second solution-solution heat exchanger 15 heats up a part of the second dilute solution, and then sends the part of the second dilute solution into the vacuum regenerator 10 for regeneration; the solution-water heat exchanger 16 mixes and cools another portion of the second dilute solution with the second concentrated solution, and then sends to a dehumidifier 17 for dehumidifying the outside air.
Wherein, the second solution circulates the connection structure of the side of the return circuit:
the solution outlet of the dehumidifier 17 is connected to the second dilute solution inlet s8 of the second solution-solution heat exchanger 15 through a branch pipe, and is connected to the solution inlet of the solution-water heat exchanger 16 after being merged with the second concentrated solution outlet s7 of the second solution-solution heat exchanger 15 through another branch pipe, and the solution outlet of the solution-water heat exchanger 16 is connected to the solution inlet of the dehumidifier 17.
The second dilute solution outlet s9 of the second solution-solution heat exchanger 15 is connected to the spray pipe inlet of the vacuum regenerator 10 through a pressure reducing valve 19, and the second dilute solution can be concentrated and regenerated by using the two heat exchange heat sources on the first heat exchange coil 20 and the second heat exchange coil 21 to generate the second concentrated solution.
Wherein the solution outlet of the vacuum regenerator 10 is connected to the second concentrated solution inlet s6 of the second solution-solution heat exchanger 15 through the second solution pump 14.
Wherein, a solution outlet of the dehumidifier 17 is provided with a third solution pump 18, and the second dilute solution is lifted to the corresponding inlets of the solution-water heat exchanger 16 and the second solution-solution heat exchanger 15 by the third solution pump 18.
In the above embodiment, the evaporator 4 is internally provided with a high-temperature cold water heat exchange tube, the cold end outlet of the high-temperature cold water heat exchange tube is connected with the inlet of the surface air cooler 7, and the hot end inlet of the high-temperature cold water heat exchange tube is connected with the outlet of the surface air cooler 7; the surface air cooler 7 is used for exchanging heat and cooling the air dehumidified by the dehumidifier 17 with high-temperature cold water, and the dehumidified and cooled fresh air can be sent to a user.
Wherein, the outlet of the cold end of the high-temperature cold water heat exchange pipe is conveyed to the surface cooler 7 through a first water pump 9.
The primary low-grade heat is hot water with the temperature of 70-80 ℃, the high-temperature cold water provided by the absorption refrigeration module is driven by the primary low-grade heat to have the temperature of 12-18 ℃, and the high-temperature cold water with the temperature of 12-18 ℃ cools the air through the surface cooler 7; the temperature of the secondary low-grade heat obtained after the primary low-grade heat releases heat is 55-70 ℃, and the secondary low-grade heat is used for driving the solution dehumidification module to operate, so that the dehumidifier 17 removes the moisture load of air.
The second concentrated solution at the outlet of the generator 1 of the absorption refrigeration module I is used for driving the vacuum regenerator 10 of the solution dehumidification module II, and the temperature of the second concentrated solution at the outlet of the generator 1 can reach 70 ℃, which is enough to be used as a driving heat source of the vacuum regenerator 10, and can effectively reduce the heat consumption of a hot water side, thereby improving the system performance.
In the low-grade heat step driving heat and humidity decoupling processing air conditioning system, the absorption type refrigeration module I forms a first solution circulation loop and a refrigerant passage, the solution dehumidification module II forms a second solution circulation loop, the refrigerant and the first solution of the absorption type refrigeration module I are driven to circularly operate by utilizing external first-grade low-grade heat, and the second-grade low-grade heat after heat release of the first-grade low-grade heat and the second solution of the first solution driving solution dehumidification module II are driven to circularly operate. Because the temperature of a driving heat source required by a traditional solution dehumidification system is about 70 ℃, and the temperature of the driving heat source required by single-effect absorption refrigeration when high-temperature cold water with the temperature of 12-18 ℃ is output is about 80 ℃, the driving heat sources of the solution dehumidification module and the single-effect absorption refrigeration module are utilized in a cascade mode, and the tail end of the solution dehumidification module and the single-effect absorption refrigeration module are realized by adopting a heat-moisture decoupling treatment mode, so that low-grade heat below 80 ℃ can be deeply utilized, and the heat energy utilization efficiency can be improved. The solution dehumidification adopts a vacuum regeneration mode to effectively improve the heat energy utilization efficiency, and the solution temperature at the outlet of the absorption refrigeration generator is about 70 ℃, so that the solution can be further used as a driving heat source of a vacuum regenerator in the solution dehumidification module to improve the system performance. The specific working process is as follows:
first solution circulation flow of absorption refrigeration module I:
the first dilute solution is discharged from the absorber 5, enters the first solution-solution heat exchanger 6 after passing through the first solution pump 8, enters the generator 1 for concentration after being heated, the temperature of the concentrated first concentrated solution can reach 70 ℃, the first concentrated solution is used as a part of a driving heat source of the vacuum regenerator 10 in the solution dehumidification module II, the cooled first concentrated solution enters the first solution-solution heat exchanger 6 for further cooling, and then enters the absorber 5 to absorb water vapor evaporated from the evaporator 4 to form the first dilute solution. The first solution flows in the direction of the arrows on the corresponding lines in fig. 1.
The refrigerant circulation process of the absorption refrigeration module I is as follows:
refrigerant water boils and evaporates out in generator 1, gets into first condenser 2, and steam is through the cooling water coil heat transfer condensation with in first condenser 2, and the comdenstion water gets into evaporimeter 4 after passing through throttle valve 3 throttle decompression, and liquid refrigerant water constantly evaporates in evaporimeter 4, gets into and is absorbed by first strong solution in the absorber 5, and refrigerant water evaporation process absorbs the heat of high temperature cold water in evaporimeter 4, lets its temperature reduce after lets in surface cooler 7 and for the air cooling. The refrigerant flow direction is shown by the direction of the arrows on the corresponding lines in fig. 1.
And a second solution circulation flow in the solution dehumidification module II:
a part of the second dilute solution leaving the dehumidifier 17 firstly enters the second solution-solution heat exchanger 15 to be heated, the heated second dilute solution is reduced in pressure by the pressure reducing valve 19 due to high pressure and then is sent to the vacuum regenerator 10, the second dilute solution sent to the vacuum regenerator 10 is concentrated under the heating of the driving heat source, the evaporated water vapor enters the second condenser 11 to be condensed into condensed water, then the condensed water is discharged by the second water pump 12 through the valve 13, the concentrated second concentrated solution enters the second solution-solution heat exchanger 15 to be cooled by the second solution pump 14, then is mixed with the other part of the self-circulating second dilute solution leaving the dehumidifier 17, and then is cooled again by the solution-water heat exchanger 16 and then is sent to the dehumidifier 17. The second solution flows as indicated by the arrows on the corresponding lines in fig. 1.
External low-grade heat source circulation flow:
the hot water with the temperature of about 80 ℃ enters the generator 1 to drive the absorption refrigeration module I to operate, the hot water with the temperature reduced to about 70 ℃ enters the vacuum regenerator 10 to drive the solution dehumidification module II to operate, and the temperature is further reduced to about 55 ℃. The hot water flow is shown in the direction of the arrows on the dashed lines in fig. 1.
The air treatment process in the system is that the new trend dehumidifies through dehumidifier 17, later gets into surface cooler 7 and cools down to reach the effect of heat and humidity decoupling zero processing.
In the present application, the terms "first solution", "second solution", "first dilute solution", "second dilute solution", "first concentrated solution", "second concentrated solution", etc. are named for clearly distinguishing the two solution circulation circuits, and do not indicate and imply that the indicated media must be two different ones, and similarly, other names referring to "first", "second", etc. should not be construed as limiting the technical solution of the present application.
Claims (4)
1. A low-grade heat step driving heat and humidity decoupling processing air conditioning system is characterized by comprising an absorption refrigeration module and a solution dehumidification module;
the absorption refrigeration module comprises a generator (1), a first condenser (2), a throttle valve (3), an evaporator (4), an absorber (5), a first solution-solution heat exchanger (6) and a surface cooler (7);
the generator (1) uses external first-grade low-grade heat as a driving heat source, so that refrigerant water sequentially passes through the generator (1), the first condenser (2), the throttle valve (3) and the evaporator (4) and then enters the absorber (5) to form a refrigerant water passage;
the absorber (5) dilutes a first concentrated solution in the absorber into a first dilute solution by using refrigerant vapor, the first solution-solution heat exchanger (6) is used for heating the first dilute solution, the generator (1) utilizes the primary low-grade heat through heat exchange to concentrate the heated first dilute solution into a first concentrated solution which is used as a heat source to be utilized by the solution dehumidification module, and then the first concentrated solution enters the absorber (5) after being cooled by the first solution-solution heat exchanger (6) to form a first solution circulation loop;
the solution dehumidification module comprises a vacuum regenerator (10), a second condenser (11), a second solution-solution heat exchanger (15), a solution-water heat exchanger (16) and a dehumidifier (17);
the vacuum regenerator (10) concentrates a second dilute solution in the vacuum regenerator into a second concentrated solution through heat exchange, wherein a heat exchange heat source is heat of the first concentrated solution and secondary low-grade heat after the heat release of the primary low-grade heat;
the second solution-solution heat exchanger (15) and the solution-water heat exchanger (16) sequentially cool the second concentrated solution, the dehumidifier (17) dehumidifies external air by using the cooled second concentrated solution and generates a second dilute solution, and the second solution-solution heat exchanger (15) heats at least a part of the second dilute solution and then sends the heated part of the second dilute solution to the vacuum regenerator (10) for regeneration to form a second solution circulation loop;
a first heat exchange coil (20), a second heat exchange coil (21) and a spray pipe are arranged in the vacuum regenerator (10), and the spray pipe and the coil pipe are also arranged in the generator (1);
a primary low-grade heat outlet (HW1) is connected with a coil inlet of the generator (1), a coil outlet of the generator (1) is connected with an inlet of the first heat exchange coil (20), and a low-grade heat source which is utilized in two stages is discharged from an outlet of the first heat exchange coil (20);
a concentrated solution outlet (s1) of the generator (1) for discharging a first concentrated solution is connected with an inlet of a second heat exchange coil (21), an outlet of the second heat exchange coil (21) is connected with a first concentrated solution inlet (s2) of a first solution-solution heat exchanger (6), a first concentrated solution outlet (s3) of the first solution-solution heat exchanger (6) is connected with a solution inlet of an absorber (5), a solution outlet of the absorber (5) is connected with a first dilute solution inlet (s4) of the first solution-solution heat exchanger (6) through a first solution pump (8), and a first dilute solution outlet (s5) of the first solution-solution heat exchanger (6) is connected with a spray pipe inlet of the generator (1);
the second solution-solution heat exchanger (15) heats part of the second dilute solution and sends the part of the second dilute solution to the vacuum regenerator (10) for regeneration; the solution-water heat exchanger (16) mixes and cools another part of the second dilute solution with the second concentrated solution, and then sends to the dehumidifier (17) for dehumidifying the outside air.
2. The low-grade heat step-driven heat and moisture decoupling process air conditioning system of claim 1, wherein the second dilute solution outlet (s9) of the second solution-solution heat exchanger (15) is connected to the spray pipe inlet of the vacuum regenerator (10) through a pressure reducing valve (19), and the solution outlet of the vacuum regenerator (10) is connected to the second concentrated solution inlet (s6) of the second solution-solution heat exchanger (15) through a second solution pump (14).
3. The low-grade heat cascade drive heat and moisture decoupling process air conditioning system of claim 1, wherein a vapor outlet of the vacuum regenerator (10) is connected to an inlet of a second condenser (11).
4. The low-grade heat cascade driving heat and moisture decoupling air conditioning system according to claim 1, wherein the primary low-grade heat is hot water with a temperature of 70-80 ℃, and drives the evaporator (4) of the absorption refrigeration module to provide high-temperature cold water with a temperature of 12-18 ℃ for the surface air cooler (7), so as to cool air; the temperature of the secondary low-grade heat obtained after the primary low-grade heat releases heat is 55-70 ℃, and the secondary low-grade heat drives the solution dehumidification module to remove the moisture load of air.
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