CN117469848B - Energy-saving condensation absorber and refrigeration system and process - Google Patents
Energy-saving condensation absorber and refrigeration system and process Download PDFInfo
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- CN117469848B CN117469848B CN202311831967.XA CN202311831967A CN117469848B CN 117469848 B CN117469848 B CN 117469848B CN 202311831967 A CN202311831967 A CN 202311831967A CN 117469848 B CN117469848 B CN 117469848B
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- 238000009833 condensation Methods 0.000 title claims abstract description 91
- 230000005494 condensation Effects 0.000 title claims abstract description 91
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 51
- 238000005057 refrigeration Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 15
- 238000010521 absorption reaction Methods 0.000 claims abstract description 106
- 238000005192 partition Methods 0.000 claims abstract description 10
- 239000003507 refrigerant Substances 0.000 claims description 183
- 239000007788 liquid Substances 0.000 claims description 175
- 230000005540 biological transmission Effects 0.000 claims description 28
- 238000005507 spraying Methods 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 28
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 79
- 230000008859 change Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B37/00—Absorbers; Adsorbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/04—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being ammonia evaporated from aqueous solution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses an energy-saving condensing absorber and a refrigerating system and a refrigerating process in the technical field of absorption refrigeration and heat pumps, wherein the energy-saving condensing absorber comprises a tube plate type heat exchanger, the tube plate type heat exchanger comprises a shell and two tube box tube sections, heat exchange tubes communicated with the two tube box tube sections are arranged in the shell, a partition plate is arranged in the tube plate type heat exchanger, the tube plate type heat exchanger is divided into two independent working cavities by the partition plate, and the two working cavities are composed of the shell, the tube box tube sections and the heat exchange tubes; the working cavity is a condensation cavity and an absorption cavity respectively; the cold source of the absorption cavity and the condensation cavity is replaced, so that the risk of corrosion of circulating water dirt to equipment is reduced, the equipment maintenance cost is reduced, and the reliability of stable operation of the equipment is improved; meanwhile, the load of the air cooler of the circulating water system is reduced, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of absorption refrigeration and heat pumps, in particular to an energy-saving condensation absorber, a refrigeration system and a refrigeration process.
Background
As shown in fig. 1, the absorption refrigeration unit uses low-grade waste heat to drive a thermodynamic working medium, and performs refrigeration through phase change of the working medium (such as ammonia). The main equipment includes a generator 11, a condenser 12, an evaporator 13, an absorber 14, a solution pump 16, and the like. The low-grade waste heat is used to heat the generator 11, the mixed solution (rich solution for short) with a certain concentration and rich in the refrigerant is conveyed from the absorber 14 by the solution pump 16, most of the refrigerant with a low boiling point in the rich solution is desorbed to become high-pressure gas refrigerant, the high-pressure gas refrigerant enters the condenser 12 and is cooled by circulating water to become high-pressure liquid refrigerant, the high-pressure liquid refrigerant is decompressed to be low-pressure liquid refrigerant by the expansion valve 17, the low-pressure liquid refrigerant enters the evaporator 13, the heat of a medium (secondary refrigerant) needing cooling is absorbed to be vaporized to be low-pressure gas refrigerant, and the low-pressure gas refrigerant enters the absorber 14. The residual high-pressure lean solution in the generator 11 is decompressed into low-pressure lean solution by a decompression valve 15, enters an absorber 14, is mixed with low-pressure gaseous refrigerant from an evaporator 13 for absorption, is recovered to the original concentration, becomes normal-temperature rich solution, is boosted by a solution pump 16, and is fed into the generator 11 for continuous circulation operation.
The above refrigeration process is used for cooling the solution in the absorber 14 and condensing the high-pressure gaseous refrigerant in the condenser 12, and the used refrigerant is circulating water, and the heat is taken away by the circulating water. In the process shown in fig. 1, the circulating water is used to cool the solution in absorber 14 and then in condenser 12.
The circulating water system is used as a system for industrial cooling in the chemical process, is continuously concentrated in the circulating flow process, and simultaneously mixes a large amount of dirt. It is easy to cause corrosion to equipment, reducing the operating life of equipment. The scale formation and even the blockage in the heat exchange tube of the heat exchanger are easy, the heat exchange efficiency of the heat exchanger is reduced, and the equipment overhaul cost is increased.
The absorber 14 serves as a core device for an absorption refrigeration unit, the absorption efficiency of which directly affects the refrigeration performance of the unit. The absorption process is mainly a coupling process of heat transfer and mass transfer, and the quality of heat transfer performance directly influences mass transfer. The current absorber 14 structure is mainly: a heat exchange tube is arranged in the shell, and circulating water passes through the heat exchange tube. A layer of spraying device is arranged above the heat exchange tube, lean liquid enters the spraying device from the top, is sprayed into an atomized state by the spraying device, is sprayed on the outer wall of the heat exchange tube, is surrounded by liquid films outside the surfaces of all tubes, and then forms films and flows down row by row. After entering the shell, the gaseous refrigerant contacts with the liquid film outside the pipe wall to be absorbed by the liquid film, and the generated mixed heat can be transferred to the circulating water through the pipe wall. Namely, the heat generated in the absorption process is taken away by the circulating water, the circulating water is used as a cold source of the absorber 14, the absorbed heat belongs to sensible heat temperature rise, no phase change exists, and the efficiency is limited. Particularly in summer, the temperature of the circulating water is higher, the heat transfer temperature difference between the absorber 14 and the absorption liquid is smaller, and the heat taken away is very limited. Thus limiting the mass transfer process of absorber 14 and directly affecting the absorption efficiency of absorber 14.
The high pressure gaseous refrigerant in the condenser 12 enters the shell side of the condenser 12 and contacts the heat exchange tube wall with lower temperature, and condensation occurs. The condensation belongs to an exothermic process, heat is taken away by circulating water in a heat exchange tube, and the circulating water is sent to an air cooler for cooling. The heat of the circulating water is transferred to the atmosphere, and the part of energy is not utilized, so that the operation load of the air cooler is increased and the electricity consumption is increased.
In addition, the low-pressure lean liquid of the absorber 14 in the absorption refrigeration unit comes from the high-pressure lean liquid coming out of the generator 11, and is throttled and depressurized by the depressurization valve 15. The throttle and the decompression increase the entropy of the high-pressure lean solution, reduce the work capacity and make no use of the high-pressure energy.
Disclosure of Invention
The invention aims to provide an energy-saving condensation absorber, a refrigeration system and a process, so as to solve the problems of the circulating water as a cooling medium in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the energy-saving condensing absorber comprises a tube plate type heat exchanger, wherein the tube plate type heat exchanger comprises a shell and two tube box tube sections, heat exchange tubes communicated with the two tube box tube sections are arranged in the shell, a partition plate is arranged in the tube plate type heat exchanger, the tube plate type heat exchanger is divided into two independent working cavities by the partition plate, and each working cavity consists of the shell, the tube box tube sections and the heat exchange tubes;
the working cavity is a condensation cavity and an absorption cavity respectively, wherein: a high-pressure gaseous refrigerant inlet and a high-pressure liquid refrigerant outlet are formed in the shell of the condensation cavity, and a medium-pressure normal-temperature rich liquid inlet and a medium-pressure medium-temperature rich liquid outlet are respectively formed in two tube box shell sections of the condensation cavity; a medium-pressure gaseous refrigerant inlet, a low-pressure lean solution inlet and a low-pressure normal-temperature rich solution outlet are formed in a shell of the absorption cavity, and a high-pressure liquid refrigerant inlet and a high-pressure gaseous refrigerant outlet are respectively formed in two tube box shell sections of the absorption cavity;
the low-pressure lean liquid inlet of the absorption cavity is connected with an impeller transmission assembly, the low-pressure normal-temperature rich liquid outlet of the absorption cavity is connected with another impeller transmission assembly, and the low-pressure normal-temperature rich liquid outlet of the absorption cavity is communicated with the medium-pressure normal-temperature rich liquid inlet of the condensation cavity through the impeller transmission assembly; the high-pressure liquid refrigerant outlet of the condensing cavity is connected with the high-pressure liquid refrigerant inlet of the absorbing cavity and is connected with an external evaporator through an expansion valve; the high-pressure gaseous refrigerant outlet of the absorption cavity and the external low-pressure gaseous refrigerant input pipeline are simultaneously connected with the medium-pressure gaseous refrigerant inlet of the absorption cavity.
Preferably, a spraying device is arranged in the shell of the absorption cavity, and is communicated with a low-pressure lean liquid inlet of the absorption cavity to spray the low-pressure lean liquid onto the heat exchange tube.
Preferably, the high-pressure gaseous refrigerant outlet of the absorption cavity and the low-pressure gaseous refrigerant input pipeline output by the external evaporator are communicated with the medium-pressure gaseous refrigerant inlet of the absorption cavity through an ejector.
Preferably, the impeller transmission assembly comprises a shaft rotatably installed on the low-pressure lean liquid inlet and the low-pressure normal-temperature rich liquid outlet, one end of the shaft is provided with an impeller, the other end of the shaft is provided with a chain wheel, two chain wheels are transmitted through a linkage mechanism, and the linkage mechanism is a chain.
Preferably, the shell comprises a shell and tube plates arranged at two ends of the shell, and the tube box shell ring comprises a tube box shell ring body and a sealing head arranged at the outer side end of the tube box shell ring body.
Preferably, the separator is provided with a heat insulating layer.
Preferably, a method for operating an energy-saving condensation absorber, using an energy-saving condensation absorber, comprises the following steps:
the first step: the high-pressure gaseous refrigerant enters the shell of the condensing cavity through the high-pressure gaseous refrigerant inlet, contacts the heat exchange tube with lower temperature, condenses into high-pressure liquid refrigerant, flows out from the high-pressure liquid refrigerant outlet of the condensing cavity, and part of the high-pressure liquid refrigerant enters the evaporator to continue refrigeration cycle;
and a second step of: the high-pressure lean solution passes through a low-pressure lean solution inlet of the absorption cavity, is converted by an impeller transmission assembly, and then is changed into low-pressure lean solution, and enters a spraying device, and the spraying device sprays the low-pressure lean solution onto the surface of a heat exchange tube of the absorption cavity to exchange heat, so that the low-pressure lean solution is mixed with medium-pressure gaseous refrigerant led in by an ejector to form low-pressure normal-temperature rich solution;
and a third step of: the low-pressure normal-temperature rich liquid passes through a low-pressure normal-temperature rich liquid outlet of the absorption cavity, is converted into medium-pressure normal-temperature rich liquid through an impeller transmission assembly, enters a heat exchange tube in the condensation cavity from a medium-pressure normal-temperature rich liquid inlet of the condensation cavity, and is used as a cold source for heat exchange to generate medium-pressure medium-temperature rich liquid which is discharged from a medium-pressure medium-temperature rich liquid outlet in the condensation cavity;
the impeller transmission assembly in the low-pressure lean solution inlet is driven to work by high-pressure lean solution flowing in the low-pressure lean solution inlet, and the impeller transmission assembly in the low-pressure normal-temperature rich solution outlet is driven to work by the impeller transmission assembly in the low-pressure lean solution inlet through a linkage mechanism.
Preferably, a refrigeration system includes: the device comprises a generator, a condenser, an evaporator and an absorber, wherein the condenser and the absorber are energy-saving condensation absorbers;
the high-pressure lean solution outlet of the generator is communicated with the low-pressure lean solution inlet of the absorption cavity, the high-pressure gaseous refrigerant outlet of the generator is communicated with the high-pressure gaseous refrigerant inlet of the condensation cavity, the medium-pressure medium-temperature rich solution outlet of the condensation cavity is communicated with the high-pressure rich solution inlet of the generator through the solution pump, the high-pressure liquid refrigerant outlet of the condensation cavity is communicated with the low-pressure liquid refrigerant inlet of the evaporator through the expansion valve, and the low-pressure gaseous refrigerant outlet of the evaporator is communicated with the inlet of the ejector.
Preferably, a refrigeration process, utilizing a refrigeration system, comprises the steps of:
the first step: heating the rich liquid in the generator by a heat source to generate high-pressure lean liquid and high-pressure gaseous refrigerant;
and a second step of: the high-pressure gaseous refrigerant enters the shell of the condensing cavity through the high-pressure gaseous refrigerant inlet, contacts the heat exchange tube with lower temperature, condenses to become high-pressure liquid refrigerant, flows out of the high-pressure liquid refrigerant outlet of the condensing cavity, and part of the high-pressure liquid refrigerant passes through the expansion valve to become low-pressure liquid refrigerant, enters the evaporator, exchanges heat with the secondary refrigerant in the evaporator to form low-pressure gaseous refrigerant and is discharged, and the other part of the high-pressure liquid refrigerant enters the heat exchange tube through the high-pressure liquid refrigerant inlet of the absorbing cavity, is used as a cold source of the absorbing cavity to exchange heat, and then generates high-pressure gaseous refrigerant to flow out of the high-pressure gaseous refrigerant outlet, enter the ejector, eject the low-pressure gaseous refrigerant out of the evaporator, mix the high-pressure gaseous refrigerant with the low-pressure gaseous refrigerant in the ejector to become medium-pressure gaseous refrigerant, and then enter the shell of the absorbing cavity;
and a third step of: the high-pressure lean solution passes through a low-pressure lean solution inlet of the absorption cavity, is converted by an impeller transmission assembly, and then is changed into low-pressure lean solution, and enters a spraying device, and the spraying device sprays the low-pressure lean solution onto the surface of a heat exchange tube of the absorption cavity to exchange heat, so that the low-pressure lean solution is mixed with medium-pressure gaseous refrigerant led in by an ejector to form low-pressure normal-temperature rich solution;
fourth step: the low-pressure normal-temperature rich liquid passes through a low-pressure normal-temperature rich liquid outlet of the absorption cavity, is converted into medium-pressure normal-temperature rich liquid through an impeller transmission assembly, enters a heat exchange tube in the condensation cavity from a medium-pressure normal-temperature rich liquid inlet of the condensation cavity, and is used as a cold source for heat exchange to generate medium-pressure medium-temperature rich liquid which is discharged from a medium-pressure medium-temperature rich liquid outlet in the condensation cavity;
fifth step: the medium-pressure medium-temperature rich liquid is conveyed into a generator for circulation through a solution pump.
Compared with the prior art, the invention has the beneficial effects that:
the high-pressure liquid refrigerant condensed in the condensing cavity is led into the absorbing cavity in one path to be used as a cold source of the absorbing cavity, and the cold source replaces circulating water, so that the circulating water absorbs heat in the absorbing cavity to generate flowing boiling, and phase change occurs, so that the heat transfer efficiency of the absorbing cavity is greatly improved, and the absorption efficiency of the absorbing cavity is improved; secondly, the liquid refrigerant self-produced by the unit is used as a cold source of the absorber instead of circulating water, so that the temperature is stable, the influence of high temperature in summer is extremely small, and the stable operation of the unit is facilitated; in addition, the generated high-pressure gaseous refrigerant passes through the ejector and is used as an ejection source to eject the low-pressure gaseous refrigerant from the evaporator, the high-pressure gaseous refrigerant and the low-pressure gaseous refrigerant are mixed in the ejector to become medium-pressure gaseous refrigerant, and then the medium-pressure gaseous refrigerant enters the absorption cavity to be absorbed, and compared with the original low-pressure gaseous refrigerant, the absorption pressure is improved, and the absorption efficiency is improved;
the invention sends the low-pressure normal-temperature rich liquid formed in the absorption cavity into the condensation cavity as a cold source of the condensation cavity, the cold source replaces circulating water, heat generated by condensing the high-pressure gaseous refrigerant outside the absorption pipe is in the heat exchange pipe of the condensation cavity, the flow kinetic energy required when the cold source enters the condenser is converted by the pressure energy of the high-pressure lean liquid flowing out of the generator through the impeller transmission assembly, the circulating water is replaced, the heat of the high-pressure gaseous refrigerant in the condensation cavity is recycled, the heat input of the generator is reduced, and the pressure energy of the high-pressure lean liquid is recycled through the impeller transmission assembly; compared with the low-pressure rich liquid originally flowing out of the absorption cavity, the medium-pressure rich liquid flows out of the condensation cavity, so that the pressure of the rich liquid is improved, the load of a subsequent solution pump for pumping the rich liquid to the generator can be reduced, and the electric energy required by the solution pump is saved; the heat energy and the pressure energy in the unit can be fully recycled, the energy consumption of the unit is reduced, and the COP is improved;
the condenser and the absorber are integrated into one piece of equipment, so that the cost of equipment and pipelines can be reduced, the occupied area of the unit is greatly reduced, and skid-mounted unit is facilitated.
Drawings
FIG. 1 is a schematic flow diagram of an absorption refrigeration unit in the prior art;
FIG. 2 is a schematic diagram of the front view of the energy-saving condensing absorber of the present invention;
FIG. 3 is a schematic side view of the energy efficient condensing absorber of the present invention;
FIG. 4 is a schematic top view of an energy efficient condensing absorber according to the present invention;
FIG. 5 is a schematic view of the structure of an absorption chamber according to the present invention;
FIG. 6 is a schematic view of a condensation chamber structure according to the present invention;
FIG. 7 is a schematic flow diagram of a refrigeration system according to the present invention;
FIG. 8 is a schematic diagram of an energy efficient condensing absorber in a refrigeration system according to the present invention;
fig. 9 is a schematic view of the impeller driving assembly structure of the present invention.
In the figure: 1. a housing; 101. an absorption chamber; 102. a condensing chamber; 2. a tube sheet; 3. tube box shell ring; 4. a seal head; 5. a heat exchange tube; 6. an impeller drive assembly; 61. a sprocket; 62. a shaft; 63. an impeller; 7. an ejector; 8. a partition plate; 9. a linkage mechanism; 10. a spraying device; 11. a generator; 12. a condenser; 13. an evaporator; 14. an absorber; 15. a pressure reducing valve; 16. a solution pump; 17. an expansion valve; 18. a high pressure liquid refrigerant inlet; 19. a low-pressure normal-temperature rich liquid outlet; 20. a low pressure lean liquid inlet; 21. a low pressure gaseous refrigerant inlet; 22. a high pressure gaseous refrigerant outlet; 23. a medium-pressure medium-temperature rich liquid outlet; 24. a high pressure gaseous refrigerant inlet; 25. a high pressure liquid refrigerant outlet; 26. medium pressure normal temperature rich liquid inlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 2, 3 and 4, an energy-saving condensing absorber includes: the tube-sheet type heat exchanger comprises a shell 1 and two tube box tube sections 3, wherein the shell 1 comprises a shell and tube sheets 2 welded at two ends of the shell, the tube box tube sections 3 are welded at one side of the tube sheets 2 far away from the shell, the tube box tube sections 3 comprise tube box tube section bodies and sealing heads 4, and the sealing heads 4 are welded at one side of the tube box tube section bodies far away from the tube sheets 2; a plurality of heat exchange tubes 5 are arranged between the two tube plates 2, the plurality of heat exchange tubes 5 are positioned in the shell 1, and the two tube box cylinder sections 3 are communicated through the heat exchange tubes 5; the tube-plate heat exchanger is internally provided with a baffle plate 8, the baffle plate 8 divides the tube-plate heat exchanger into two independent working cavities, each working cavity consists of a shell 1, a tube box shell section 3 and a heat exchange tube 5, the baffle plate 8 extends along the axial direction of the shell 1, and the two working cavities are a condensation cavity 102 and an absorption cavity 101 respectively.
Referring to fig. 6, a high-pressure gaseous refrigerant inlet 24 is provided on the right side of the top of the housing 1 of the condensation chamber 102, and a high-pressure liquid refrigerant outlet 25 is provided on the left side of the bottom of the housing 1 of the condensation chamber 102; the bottom of the left side tube box shell section 3 of the condensation cavity 102 is provided with a medium-pressure normal-temperature rich liquid inlet 26, and the bottom of the right side tube box shell section 3 of the condensation cavity 102 is provided with a medium-pressure medium-temperature rich liquid outlet 23.
Referring to fig. 5, a middle-pressure gaseous refrigerant inlet is formed on the right side of the top of a shell 1 of an absorption cavity 101, an ejector 7 is arranged at the inlet of the middle-pressure gaseous refrigerant inlet, a low-pressure gaseous refrigerant inlet 21 of the ejector 7 is communicated with a low-pressure gaseous refrigerant outlet of an evaporator 13, a low-pressure lean liquid inlet 20 is formed at the top of the shell 1 of the absorption cavity 101, a spraying device 10 is mounted in the shell 1 of the absorption cavity 101, the spraying device 10 is communicated with the low-pressure lean liquid inlet 20, the spraying device 10 is positioned above a heat exchange tube 5 in the absorption cavity 101, a low-pressure normal-temperature rich liquid outlet 19 is formed at the bottom of the shell 1 of the absorption cavity 101, impeller driving assemblies 6 are respectively arranged on the low-pressure lean liquid inlet 20 and the low-pressure normal-temperature rich liquid outlet 19, and the two impeller driving assemblies 6 are driven by a linkage mechanism 9; the bottom of the left pipe box shell ring 3 of the absorption cavity 101 is provided with a high-pressure liquid refrigerant inlet 18, the top of the right pipe box shell ring 3 of the absorption cavity 101 is provided with a high-pressure gaseous refrigerant outlet 22, and the high-pressure gaseous refrigerant outlet 22 is communicated with the inlet of the ejector 7.
Referring to fig. 2, 3, 4, 5, 6 and 7, the low-pressure normal-temperature rich liquid outlet 19 of the absorption chamber 101 is communicated with the medium-pressure normal-temperature rich liquid inlet 26 of the condensation chamber 102; the high-pressure liquid refrigerant outlet 25 of the condensation chamber 102 communicates with the high-pressure liquid refrigerant inlet 18 of the absorption chamber 101 while being connected to the external evaporator 13 through an expansion valve 17 (the high-pressure liquid refrigerant outlet 25 of the condensation chamber 102 is connected to the absorption chamber 101 and the expansion valve 17, respectively).
It should be noted that, referring to fig. 9, the impeller driving assembly 6 includes a shaft 62 rotatably mounted on the low-pressure lean solution inlet 20 and the low-pressure normal-temperature rich solution outlet 19, an impeller 63 is disposed at one end of the shaft 62, a sprocket 61 is disposed at the other end of the shaft 62, and the linkage mechanism 9 is a chain, and the two sprockets 61 are driven by the chain.
In this embodiment, as a further optimization, referring to fig. 3 and 4, the surface of the partition 8 is coated with a heat insulating layer, so that the temperature between the condensation chamber 102 and the absorption chamber 101 is not affected by the partition 8.
The operation method of the energy-saving condensation absorber comprises the following steps:
the first step: the high-pressure gaseous refrigerant enters the shell 1 of the condensation cavity 102 through the high-pressure gaseous refrigerant inlet 24 of the condensation cavity 102, contacts the heat exchange tube 5 with lower temperature, is condensed to become high-pressure liquid refrigerant, flows out of the high-pressure liquid refrigerant outlet 25 of the condensation cavity 102, one part of the high-pressure liquid refrigerant enters the evaporator 13 to continue refrigeration cycle, the other part of the high-pressure liquid refrigerant enters the heat exchange tube 5 through the high-pressure liquid refrigerant inlet 18 of the absorption cavity 101 to be used as a cold source of the absorption cavity 101 for heat exchange, and then generates high-pressure gaseous refrigerant, flows out of the high-pressure gaseous refrigerant outlet 22, enters the ejector 7, ejects the low-pressure gaseous refrigerant out of the evaporator 13, mixes the high-pressure gaseous refrigerant with the low-pressure gaseous refrigerant in the ejector 7 to become medium-pressure gaseous refrigerant, and then enters the shell of the absorption cavity 101;
and a second step of: the high-pressure lean solution passes through the low-pressure lean solution inlet 20 of the absorption cavity 101, is converted by the impeller transmission assembly 6, and then is changed into low-pressure lean solution, and enters the spraying device 10, the spraying device 10 sprays the low-pressure lean solution onto the surface of the heat exchange tube 5 of the absorption cavity 101 for heat exchange, and the low-pressure lean solution is mixed with the medium-pressure gaseous refrigerant led in by the ejector 7 to form low-pressure normal-temperature rich solution;
and a third step of: the low-pressure normal-temperature rich liquid passes through the low-pressure normal-temperature rich liquid outlet 19 of the absorption cavity 101, is converted by the impeller transmission assembly 6, becomes medium-pressure normal-temperature rich liquid, enters the heat exchange tube 5 in the condensation cavity 102 from the medium-pressure normal-temperature rich liquid inlet 26 of the condensation cavity 102, and is discharged from the medium-pressure medium-temperature rich liquid outlet 23 in the condensation cavity 102 after being used as a cold source for heat exchange;
the impeller driving assembly 6 in the low-pressure lean solution inlet 20 is driven to work by the high-pressure lean solution flowing in the low-pressure lean solution inlet 20, the impeller driving assembly in the low-pressure normal-temperature rich solution outlet 19 is driven to work by the impeller driving assembly 6 in the low-pressure lean solution inlet 20 through a linkage mechanism (specifically, the high-pressure lean solution flows in the low-pressure lean solution inlet 20, the impeller driving assembly 6 is driven to work by the pressure of the high-pressure lean solution, the impeller driving assembly 6 in the low-pressure normal-temperature rich solution outlet 19 is driven to synchronously drive through the linkage mechanism 9, and the low-pressure normal-temperature rich solution is pressurized to be medium-pressure normal-temperature rich solution and is conveyed into the condensation cavity 102, and the high-pressure lean solution drives the impeller driving assembly 6 to work, so that the impeller driving assembly can convert the high-pressure lean solution into the low-pressure lean solution to utilize the kinetic energy of the high-pressure lean solution).
The energy-saving condensation absorber functions as follows;
firstly, the high-pressure liquid refrigerant condensed in the condensation cavity 102 enters the absorption cavity 101 in one path to be used as a cold source of the absorption cavity 101, circulating water is replaced by the high-pressure liquid refrigerant, and the high-pressure liquid refrigerant absorbs heat in a pipe of the absorption cavity 101 to generate flowing boiling, phase change occurs, so that the heat transfer efficiency of the absorption cavity 101 is greatly improved, and the absorption efficiency of the absorption cavity 101 is improved; secondly, the liquid refrigerant produced by the unit is used as a cold source of an absorption cavity instead of circulating water, so that the temperature is stable and the influence of high temperature in summer is very small; the stable operation of the unit is facilitated; in addition, the generated high-pressure gaseous refrigerant is passed through the ejector 7 as an ejection source, the low-pressure gaseous refrigerant from the evaporator 13 is ejected, and the high-pressure gaseous refrigerant and the low-pressure gaseous refrigerant are mixed in the ejector 7 to become medium-pressure gaseous refrigerant, and then enter the absorption chamber 101 to be absorbed. Compared with the original low-pressure gaseous refrigerant, the absorption pressure is improved, and the absorption efficiency is improved;
secondly, the low-pressure normal-temperature rich liquid formed in the absorption cavity 101 is sent into the condensation cavity 102 and used as a cold source of the condensation cavity 102, circulating water is replaced by the cold source, and the cold source is arranged in the heat exchange tube 5 of the condensation cavity 102 and absorbs heat generated by condensation of high-pressure gaseous refrigerant outside the tube; the flow kinetic energy required when the high-pressure lean liquid enters the condensation cavity 102 is converted by the pressure energy of the high-pressure lean liquid flowing out of the generator 11 through the impeller transmission assembly 6; not only replaces circulating water, but also recovers and utilizes the heat of the high-pressure gaseous refrigerant in the condensing cavity 102, and reduces the heat input of the generator 11 (the rich liquid absorbs heat in the condensing cavity 102 to raise the temperature of the rich liquid); the pressure energy of the high-pressure lean solution is recycled through the impeller transmission assembly 6, compared with the low-pressure rich solution which flows from the absorption cavity 101 originally, the medium-pressure rich solution flows out from the condensation cavity 102, so that the pressure of the rich solution is improved, the pressure of the subsequent solution pump 16 for pumping the high-pressure lean solution can be reduced, the load of the subsequent solution pump 16 for the generator 11 is reduced, and the electric energy required by the solution pump 16 is saved; the heat energy and the pressure energy in the unit are fully recycled, the energy consumption of the unit is reduced, and the COP is improved;
thirdly, as cold sources (circulating water) of the absorption cavity 101 and the condensation cavity 102 are replaced, the risk of corrosion of equipment caused by dirt of the circulating water is reduced, the equipment maintenance cost is reduced, and the reliability of stable operation of the equipment is improved; meanwhile, the load of the air cooler of the circulating water system is reduced, and the energy consumption is reduced;
fourth, the condenser 12 and the absorber 14 are integrated into one device, so that the cost of the device and the pipeline can be reduced, the occupied area of the unit is greatly reduced, and the skid-mounted unit is facilitated.
Example 2
Referring to fig. 7 and 8, a refrigeration system includes: the energy-saving condensing absorber comprises a generator 11, a condenser 12, an evaporator 13 and an absorber 14, wherein the condenser 12 and the absorber 14 are the energy-saving condensing absorber;
the high-pressure lean liquid outlet of the generator 11 is communicated with the low-pressure lean liquid inlet 20 of the absorption cavity 101, the high-pressure gaseous refrigerant outlet of the generator 11 is communicated with the high-pressure gaseous refrigerant inlet 24 of the condensation cavity 102, the medium-pressure medium-temperature rich liquid outlet 23 of the condensation cavity 102 is communicated with the high-pressure rich liquid inlet of the generator 11 through the solution pump 16, the high-pressure liquid refrigerant outlet 25 of the condensation cavity 102 is communicated with the low-pressure liquid refrigerant inlet of the evaporator 13 through the expansion valve 17 (the high-pressure liquid refrigerant outlet 25 of the condensation cavity 102 is connected with two devices, one is connected with the absorption cavity 101, the other is connected with the expansion valve 17), and the low-pressure gaseous refrigerant outlet of the evaporator 13 is communicated with the inlet of the ejector 7.
A refrigeration process realized by the refrigeration system comprises the following steps:
the first step: after the rich liquid is heated by a heat source in the generator 11, the refrigerant contained in the rich liquid is evaporated, the evaporated refrigerant becomes high-pressure gaseous refrigerant, and the rich liquid from which the refrigerant is removed becomes high-pressure lean liquid;
and a second step of: the high-pressure gaseous refrigerant enters the shell 1 of the condensation cavity 102 through the high-pressure gaseous refrigerant inlet 24 of the condensation cavity 102, contacts the heat exchange tube 5 with lower temperature, condenses to become high-pressure liquid refrigerant, flows out of the high-pressure liquid refrigerant outlet 25 of the condensation cavity 102, and enters the evaporator 13 after part of the high-pressure liquid refrigerant passes through the expansion valve 17 and becomes low-pressure liquid refrigerant, forms low-pressure gaseous refrigerant after heat exchange with the secondary refrigerant introduced into the evaporator 13 and is discharged, and the other part of the high-pressure liquid refrigerant enters the heat exchange tube 5 through the high-pressure liquid refrigerant inlet 18 of the absorption cavity 101 and is used as a cold source of the absorption cavity 101 to generate high-pressure gaseous refrigerant to flow out of the high-pressure gaseous refrigerant outlet 22, enter the ejector 7, and is mixed with the low-pressure gaseous refrigerant in the ejector 7 to become gaseous refrigerant and then enters the shell 1 of the absorption cavity 101;
and a third step of: the high-pressure lean solution passes through the low-pressure lean solution inlet 20 of the absorption cavity 101, is converted by the impeller transmission assembly 6, and then is changed into low-pressure lean solution, and enters the spraying device 10, the spraying device 10 sprays the low-pressure lean solution onto the surface of the heat exchange tube 5 of the absorption cavity 101 for heat exchange, and the low-pressure lean solution is mixed with the medium-pressure gaseous refrigerant led in by the ejector 7 to form low-pressure normal-temperature rich solution;
fourth step: the low-pressure normal-temperature rich liquid passes through the low-pressure normal-temperature rich liquid outlet 19 of the absorption cavity 101, is converted by the impeller transmission assembly 6, becomes medium-pressure normal-temperature rich liquid, enters the heat exchange tube 5 in the condensation cavity 102 from the medium-pressure normal-temperature rich liquid inlet 26 of the condensation cavity 102, and is discharged from the medium-pressure medium-temperature rich liquid outlet 23 in the condensation cavity 102 after being used as a cold source for heat exchange;
fifth step: the medium-pressure medium-temperature rich liquid is conveyed to the generator 11 for circulation through the solution pump 16.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an energy-saving condensation absorber, includes tube sheet type heat exchanger, tube sheet type heat exchanger includes casing (1) and two pipe case shell ring (3), be equipped with heat exchange tube (5) of two pipe case shell ring (3) of intercommunication in casing (1), its characterized in that: a partition plate (8) is arranged in the tube plate type heat exchanger, the partition plate (8) divides the tube plate type heat exchanger into two independent working cavities, and each working cavity consists of a shell (1), a tube box shell ring (3) and a heat exchange tube (5);
the working chambers are respectively a condensation chamber (102) and an absorption chamber (101), wherein: a high-pressure gaseous refrigerant inlet and a high-pressure liquid refrigerant outlet are formed in a shell (1) of the condensation cavity (102), and a medium-pressure normal-temperature rich liquid inlet and a medium-pressure medium-temperature rich liquid outlet are respectively formed in two tube box shell sections (3) of the condensation cavity (102); a medium-pressure gaseous refrigerant inlet, a low-pressure lean solution inlet and a low-pressure normal-temperature rich solution outlet are formed in a shell (1) of the absorption cavity (101), and a high-pressure liquid refrigerant inlet and a high-pressure gaseous refrigerant outlet are respectively formed in two tube box shell sections (3) of the absorption cavity (101);
the low-pressure lean liquid inlet of the absorption cavity (101) is connected with an impeller transmission assembly (6), the low-pressure normal-temperature rich liquid outlet of the absorption cavity (101) is connected with another impeller transmission assembly (6), and the low-pressure normal-temperature rich liquid outlet of the absorption cavity (101) is communicated with the medium-pressure normal-temperature rich liquid inlet of the condensation cavity (102) through the impeller transmission assembly (6); the high-pressure liquid refrigerant outlet of the condensing cavity (102) is connected with the high-pressure liquid refrigerant inlet of the absorbing cavity (101) and is connected with an external evaporator through an expansion valve; the high-pressure gaseous refrigerant outlet of the absorption cavity (101) and the external low-pressure gaseous refrigerant input pipeline are simultaneously connected with the medium-pressure gaseous refrigerant inlet of the absorption cavity (101).
2. An energy efficient condensation absorber according to claim 1, wherein: a spraying device (10) is arranged in a shell (1) of the absorption cavity (101), the spraying device (10) is communicated with a low-pressure lean liquid inlet of the absorption cavity (101), and the low-pressure lean liquid is sprayed onto the heat exchange tube (5).
3. An energy efficient condensation absorber according to claim 1, wherein: the high-pressure gaseous refrigerant outlet of the absorption cavity (101) and the low-pressure gaseous refrigerant input pipeline output by the external evaporator are communicated with the medium-pressure gaseous refrigerant inlet of the absorption cavity (101) through an ejector (7).
4. An energy efficient condensation absorber according to claim 1, wherein: the impeller transmission assembly (6) comprises a shaft (62) rotatably installed on a low-pressure lean liquid inlet and a low-pressure normal-temperature rich liquid outlet, an impeller (63) is arranged at one end of the shaft (62), a chain wheel (61) is arranged at the other end of the shaft (62), two chain wheels (61) are in transmission through a linkage mechanism (9), and the linkage mechanism (9) is a chain.
5. An energy efficient condensation absorber according to claim 1, wherein: the shell (1) comprises a shell and tube plates (2) arranged at two ends of the shell, and the tube box shell ring (3) comprises a tube box shell ring body and a sealing head (4) arranged at the outer side end of the tube box shell ring body.
6. An energy efficient condensation absorber according to claim 1, wherein: and a heat insulation layer is arranged on the partition plate (8).
7. A method of operating an energy efficient condensation absorber using an energy efficient condensation absorber as claimed in any one of claims 1 to 6, characterized in that: the method comprises the following steps:
the first step: the high-pressure gaseous refrigerant enters a shell (1) of a condensation cavity (102) through a high-pressure gaseous refrigerant inlet, is in contact with a heat exchange tube (5) with lower temperature, is condensed to become high-pressure liquid refrigerant, flows out of a high-pressure liquid refrigerant outlet of the condensation cavity (102), one part of the high-pressure liquid refrigerant enters an evaporator to continue refrigeration cycle, the other part of the high-pressure liquid refrigerant enters the heat exchange tube (5) through a high-pressure liquid refrigerant inlet of an absorption cavity (101) to serve as a cold source of the absorption cavity (101) to exchange heat, and then generates high-pressure gaseous refrigerant, flows out of the high-pressure gaseous refrigerant outlet, enters an ejector (7), is ejected to become medium-pressure gaseous refrigerant after being mixed with the low-pressure gaseous refrigerant in the ejector (7), and then enters the shell of the absorption cavity (101);
and a second step of: the high-pressure lean solution passes through a low-pressure lean solution inlet of the absorption cavity (101) and is converted by an impeller transmission assembly (6) at the position, and then is changed into low-pressure lean solution, the low-pressure lean solution enters a spraying device (10), the spraying device (10) sprays the low-pressure lean solution onto the surface of a heat exchange tube (5) of the absorption cavity (101) to exchange heat, and the low-pressure lean solution is mixed with medium-pressure gaseous refrigerant led in by an ejector (7) to form low-pressure normal-temperature rich solution;
and a third step of: the low-pressure normal-temperature rich liquid passes through a low-pressure normal-temperature rich liquid outlet of the absorption cavity (101) and is converted by the impeller transmission assembly (6) at the low-pressure normal-temperature rich liquid outlet, then the low-pressure normal-temperature rich liquid is changed into medium-pressure normal-temperature rich liquid, the medium-pressure normal-temperature rich liquid enters a heat exchange tube (5) in the condensation cavity (102) from a medium-pressure normal-temperature rich liquid inlet of the condensation cavity (102) and is used as a cold source for heat exchange, and then the medium-pressure medium-temperature rich liquid is generated and discharged from a medium-pressure medium-temperature rich liquid outlet in the condensation cavity (102);
the impeller driving assembly (6) in the low-pressure lean liquid inlet is driven to work by high-pressure lean liquid flowing in the low-pressure lean liquid inlet, and the impeller driving assembly (6) in the low-pressure normal-temperature rich liquid outlet is driven to work by the impeller driving assembly (6) in the low-pressure lean liquid inlet through the linkage mechanism (9).
8. A refrigeration system, comprising: generator, condenser, evaporimeter and absorber, its characterized in that: the condenser and absorber are the energy-saving condensing absorber of claim 3;
the high-pressure lean solution outlet of the generator is communicated with the low-pressure lean solution inlet of the absorption cavity (101), the high-pressure gaseous refrigerant outlet of the generator is communicated with the high-pressure gaseous refrigerant inlet of the condensation cavity (102), the medium-pressure medium-temperature rich solution outlet of the condensation cavity (102) is communicated with the high-pressure rich solution inlet of the generator through a solution pump, the high-pressure liquid refrigerant outlet of the condensation cavity (102) is communicated with the low-pressure liquid refrigerant inlet of the evaporator through an expansion valve, and the low-pressure gaseous refrigerant outlet of the evaporator is communicated with the inlet of the ejector (7).
9. A refrigeration process utilizing a refrigeration system as recited in claim 8 wherein: the method comprises the following steps:
the first step: heating the rich liquid in the generator by a heat source to generate high-pressure lean liquid and high-pressure gaseous refrigerant;
and a second step of: the high-pressure gaseous refrigerant enters a shell (1) of a condensation cavity (102) through a high-pressure gaseous refrigerant inlet, contacts a heat exchange tube (5) with lower temperature, is condensed to become high-pressure liquid refrigerant, flows out of a high-pressure liquid refrigerant outlet of the condensation cavity (102), part of the high-pressure liquid refrigerant passes through an expansion valve and becomes low-pressure liquid refrigerant, enters an evaporator, exchanges heat with the secondary refrigerant in the evaporator to form low-pressure gaseous refrigerant and is discharged, and the other part of the high-pressure liquid refrigerant enters the heat exchange tube (5) through a high-pressure liquid refrigerant inlet of an absorption cavity (101) and is used as a cold source of the absorption cavity (101) to generate high-pressure gaseous refrigerant, flows out of a high-pressure gaseous refrigerant outlet and flows into an ejector (7), is mixed with the low-pressure gaseous refrigerant in the evaporator (7) to become gaseous refrigerant, and then enters the shell (1) of the absorption cavity (101);
and a third step of: the high-pressure lean solution passes through a low-pressure lean solution inlet of the absorption cavity (101) and is converted by an impeller transmission assembly (6) at the position, and then is changed into low-pressure lean solution, the low-pressure lean solution enters a spraying device (10), the spraying device (10) sprays the low-pressure lean solution onto the surface of a heat exchange tube (5) of the absorption cavity (101) to exchange heat, and the low-pressure lean solution is mixed with medium-pressure gaseous refrigerant led in by an ejector (7) to form low-pressure normal-temperature rich solution;
fourth step: the low-pressure normal-temperature rich liquid passes through a low-pressure normal-temperature rich liquid outlet of the absorption cavity (101) and is converted by the impeller transmission assembly (6) at the low-pressure normal-temperature rich liquid outlet, then the low-pressure normal-temperature rich liquid is changed into medium-pressure normal-temperature rich liquid, the medium-pressure normal-temperature rich liquid enters a heat exchange tube (5) in the condensation cavity (102) from a medium-pressure normal-temperature rich liquid inlet of the condensation cavity (102) and is used as a cold source for heat exchange, and then the medium-pressure medium-temperature rich liquid is generated and discharged from a medium-pressure medium-temperature rich liquid outlet in the condensation cavity (102);
fifth step: the medium-pressure medium-temperature rich liquid is conveyed into a generator for circulation through a solution pump.
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