CN102322705B - Circulating device combining diffusing absorption-type refrigeration and vapor compression refrigeration - Google Patents

Circulating device combining diffusing absorption-type refrigeration and vapor compression refrigeration Download PDF

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Publication number
CN102322705B
CN102322705B CN 201110217820 CN201110217820A CN102322705B CN 102322705 B CN102322705 B CN 102322705B CN 201110217820 CN201110217820 CN 201110217820 CN 201110217820 A CN201110217820 A CN 201110217820A CN 102322705 B CN102322705 B CN 102322705B
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outlet
condenser
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entrance
heat exchanger
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CN102322705A (en
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李舒宏
冯义康
张小松
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Southeast University
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Southeast University
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Abstract

The invention provides a circulating device combining diffusing absorption-type refrigeration and vapor compression refrigeration. The circulating device is characterized by comprising a compressor (1), a generator (2), a first condenser (3), a throttling valve (4), a first evaporator (5), a second condenser (6), a second evaporator (7), a gas heat exchanger (8), an absorption device (9), a liquid storage device (10), a liquid heat exchanger (11) and a hydrogen tank (12); a vapor compression refrigeration circulating side and the exhaust port of the compressor (1) are connected with the inlet of the heat exchanger; the outlet of the heat exchanger is connected with the inlet of the first condenser (3); the outlet pipeline of the first condenser (3) is connected with the inlet of the throttling valve (4) through the second evaporator (7); the outlet of the throttling valve (4) is connected with the inlet of the first evaporator (5); and the outlet of the first evaporator (5) is connected with an air suction port of the compressor. According to the invention, the refrigeration coefficient of the refrigerating system can be improved.

Description

Diffusion absorption refrigeration ice and vapour compression refrigeration combined cycle power plant
Technical field
The present invention relates to diffusion absorption refrigeration ice and vapor-compression refrigerant cycle combined unit and method, belong to refrigeration and low temperature field.
Background technology
At present, affect economic development because of energy supply shortage or rise in price, the utilization rate that how can improve the energy becomes the task of top priority.Vapour compression refrigeration system is widely used in the various fields such as air-conditioning, Food Freezing and Cold Storage, industrial manufacture process control, the energy that refrigeration system consumption is a large amount of, and the coefficient of refrigerating performance that therefore improves vapour compression refrigeration system has important meaning.
The degree of supercooling that increases the liquid refrigerant of condensator outlet is to improve an important means of the coefficient of refrigerating performance of vapor-compression refrigerant cycle, in the identical situation of compressor wasted work, degree of supercooling increases, specific refrigerating effect must increase, therefore coefficient of refrigerating performance also must increase, so the raising of degree of supercooling is for always favourable on the Cyclical Theory, and degree of supercooling is larger, more favourable to circulation.Under normal conditions, 1 ℃ of the every increase of degree of supercooling, refrigerating capacity just may increase by 1%~1.5%.The backheat circulation of generally using is the low temperature with evaporator outlet, the high temperature of low pressure refrigerant and condensator outlet, the high-pressure refrigerant heat exchange, thereby obtain certain degree of supercooling, but the backheat circulation is limited to the raising of degree of supercooling, to the cold-producing medium (ammonia and R22(monochlorodifluoromethane) that has) cause on the contrary the decline of coefficient of refrigerating performance, and the compressor air suction excess Temperature, displacement reduces, also can cause systematic function to descend, this operation for whole system is disadvantageous, and use other the cooling method of crossing, need cooling medium, and environment temperature determines that these cross cooling method and be difficult to supercooling temperature is reduced to below the environment temperature, and obtaining for excessively cold low-temperature receiver also needs to consume additional energy source.
In the middle of the steam-refrigerated circulation of reality, the refrigerant gas of compressor outlet is all with the very large degree of superheat, the heat of these superheated steam the insides is pulled away in condenser, all be discharged in the middle of environment and the cooling medium, reasonably do not utilized, cause the waste of the high-order energy of this section, also environment has been caused thermal pollution simultaneously.Utilize this part heat to improve heat exchanger efficiency and utilize this degree of superheat to increase the excessively cold method of compressor cooling circulating refrigerant not only can add few condenser heat discharging to the impact of environment, can improve the efficient of whole refrigeration system simultaneously.
Hydrogen ammonia diffusion absorbing refrigeration is take heat energy as driving, adopt the ammoniacal liquor natural medium, do not have destruction and greenhouse effects to ozone layer, environmentally friendly and can adopt waste heat to drive, effectively save the energy, become an important research direction of refrigeration industry.Hydrogen ammonia diffusion absorbing refrigeration is compared with compression by adopting assist gas to come the pressure of balance sysmte, and diffusion absorbing is without any moving component, and shockproof and noise during operation can adopt various energy resources to drive, without the CFC(CFC) substitution problem.
If with steam compression type refrigeration and diffusion absorption refrigeration ice associating, the heat that reclaims the hyperthermia and superheating steam of compressor outlet drives diffusion absorption type refrigeration system, the cold that diffusion absorption type refrigeration system is produced is used for the cold-producing medium of cooling steam compression refrigerating system condensator outlet, increase the degree of supercooling of cold-producing medium in the vapor compression refrigeration system, so not only avoid the waste of the energy, also improved the coefficient of refrigerating performance of vapour compression refrigeration system simultaneously.
Summary of the invention
Technical problem:The purpose of this invention is to provide a kind of diffusion absorption refrigeration ice and vapour compression refrigeration combined cycle power plant, improve the coefficient of refrigerating performance of refrigeration system, under the prerequisite that does not improve the compressor wasted work, the heat of the hyperthermia and superheating steam of compressor outlet drives diffusion absorption type refrigeration system, the cold that diffusion absorption type refrigeration system is produced is used for the cold-producing medium of cooling steam compression refrigerating system condensator outlet, increase the degree of supercooling of cold-producing medium in the vapor compression refrigeration system, thereby reach the refrigerating capacity and the coefficient of refrigerating performance purpose that improve vapor compression refrigeration system, less system is to the heat extraction of environment simultaneously.
Technical scheme:For solving the problems of the technologies described above, the invention provides a kind of diffusion absorption refrigeration ice and vapour compression refrigeration combined cycle power plant,
This device comprises compressor, generator, the first condenser, choke valve, the first evaporimeter, the second condenser, the second evaporimeter, gas heat-exchanger, absorber, reservoir, liquid heat exchanger, hydrogen gas tank;
The vapor-compression refrigerant cycle side, exhaust outlet of compressor links to each other with heat exchanger entrance in the generator, heat exchanger exit links to each other with the entrance of the first condenser, the export pipeline of the first condenser links to each other with the choke valve entrance by the second evaporimeter, the choke valve outlet links to each other with the entrance of the first evaporimeter, the outlet of the first evaporimeter links to each other with the air entry of compressor, finishes circulation;
In the diffusion absorption refrigeration ice circulation side, generator top steam (vapor) outlet links to each other with the entrance of the second condenser, the first outlet of the second condenser links to each other with the second evaporator inlet, the second outlet of the second condenser links to each other with hydrogen gas tank, the second evaporator outlet links to each other with the first entrance of gas heat-exchanger, gas heat-exchanger the first outlet links to each other with the reservoir entrance, reservoir the first outlet links to each other with the solution heat exchanger entrance, solution heat exchanger the second outlet links to each other with airlift pump entrance in the generator, reservoir the second outlet links to each other with the absorber bottom, absorber top one port enters gas heat-exchanger through gas heat-exchanger the second entrance, then out link to each other with hydrogen gas tank from gas heat-exchanger the second outlet, the another port of absorber links to each other with the first outlet of solution heat exchanger, and the entrance of solution heat exchanger links to each other with weak solution tank outlet in the generator.
Preferably, the airlift pump of pipe ring in generator of the hyperthermia and superheating steam of compressor outlet, the generator of heating diffusion absorption type refrigeration system drives diffusion absorption type refrigeration system, the cold that the second evaporimeter is produced in the diffusion absorption type refrigeration system comes the cold-producing medium of cooling steam compression refrigerating system the first condensator outlet by double pipe heat exchanger, increases the degree of supercooling of cold-producing medium in the vapor compression refrigeration system.
In the vapour compression refrigeration system side, from the superheated steam of the HTHP of compressor outlet in the generator of diffusion type refrigeration system after the evolution of heat, continue to enter in the first condenser and be condensed into refrigerant liquid, and then enter heat absorption evaporation in the first evaporimeter after the expansion valve throttling by the steam compression type refrigeration circulation after in heat exchanger (evaporimeter of diffusion compression-type refrigerating system), being cooled into the subcooled liquid larger for degree of supercooling, produce refrigerating capacity.
In diffusion absorption refrigeration ice and the steam compression type refrigeration combined cycle, because the heat for the superheated steam of the cold-producing medium of compressor outlet is fully used, can effectively reduce the condensation load of condenser, increase the effective area of heat exchanger, and can utilize to change part superheat section heat and got coldly, can increase the refrigerating capacity of vapour compression refrigeration system, improve the Energy Efficiency Ratio of vapor-compression refrigerant cycle, this operation for system is very favourable, can play obvious energy-saving effect.
Beneficial effect:
1. take full advantage of the high temperature of compressor outlet, the degree of superheat of higher pressure refrigerant gas, reduced the condensation number of condenser, avoided heat directly to discharge to environment, be not fully used, also improved the area utilization of condenser simultaneously.
2. produce cold by driving the diffusion absorption refrigeration ice circulation, make condensed refrigerant liquid further excessively cold, can improve like this degree of supercooling of cold-producing medium, improve specific refrigerating effect, thereby improve the coefficient of refrigerating performance of system, reach energy-conservation effect.
Description of drawings
Fig. 1 is systematic schematic diagram of the present invention;
Comprising such as lower device: compressor 1, generator 2, the first condensers 3, choke valve 4, the first
Evaporimeter 5, the second condensers 6, the second evaporimeters 7, gas heat-exchanger 8, absorber 9, reservoir 10, liquid heat exchanger 11, hydrogen gas tank 12;
Fig. 2 is generator architecture figure;
Comprising such as lower device: A-riser, B-airlift pump, C-weak solution tank, D-concentrated solution tank.
The specific embodiment
Diffusion absorption refrigeration ice of the present invention and vapour compression refrigeration combined cycle power plant improve the coefficient of refrigerating performance of vapor compression refrigeration system.
Implementation of the present invention is to utilize the heat of superheated steam of compressor outlet as the driving heat source of diffusion absorption type refrigeration system, drive diffusion absorption type refrigeration system, the cold that diffusion absorption type refrigeration system is produced is used for the cold-producing medium of cooling steam compression refrigerating system condensator outlet, increase the degree of supercooling of cold-producing medium in the vapor compression refrigeration system, thereby improved the refrigerating capacity of vapor-compression refrigerant cycle, improved the coefficient of refrigerating performance of vapor compression refrigeration system.
The present invention is coupled diffusion absorption refrigeration ice and vapor-compression refrigerant cycle, proposes the refrigerating efficiency that a kind of combined cycle method and device improve refrigeration system.In the circulation of existing steam compression type refrigeration, adopt the backheat circulation in order to make cold-producing medium that certain degree of supercooling be arranged, this circulation has caused the compressor specific work to become large, and unit condensation quantitative change is large, and displacement such as reduces at the problem.The combined cycle method that the present invention proposes utilizes the heat of the hyperthermia and superheating steam of compressor outlet to drive diffusion absorption type refrigeration system, the cold that utilizes diffusion absorption type refrigeration system to produce is used for the cold-producing medium of cooling steam compression refrigerating system condensator outlet, increase the degree of supercooling of cold-producing medium in the vapor compression refrigeration system, improved the coefficient of refrigerating performance of vapor compression refrigeration system.
Diffusion absorption refrigeration ice and vapour compression refrigeration combined cycle power plant are a kind of kind of refrigeration cycle that diffusion absorption refrigeration system and steam compression type refrigeration are combined with each other, in order to utilize in the steam compression type refrigeration circulation compressor outlet superheated steam as the driving heat source of diffusion absorption refrigeration ice, in the generator of diffusion absorption refrigeration system, heat exchange coil is set, this heat exchange coil tightly on the airlift pump of generator, is used for ammonia spirit in heating airlift pump concentrated ammonia solution and the generator; Being condensed into liquefied ammonia in condenser after, the dense ammonia solution that generator produces enters evaporimeter heat absorption sweat cooling, the refrigerating capacity that produces is used for cooling refrigerant liquid after the vapour compression refrigeration system condenser condenses, thereby the degree of supercooling of cold-producing medium in the increase vapour compression refrigeration system improves vapour compression refrigeration system refrigerating capacity and coefficient of refrigerating performance.
In the diffusion absorption refrigeration ice circulation side, in the diffusion absorption type refrigeration system in the generator concentrated ammonia solution produced ammonia steam by the superheated steam of vapour compression refrigeration system heating.The dense ammonia that produces in generator enters in diffusion compression-type refrigerating system the second condenser and is condensed into liquefied ammonia, liquefied ammonia enters in the evaporimeter of diffusion compression-type refrigerating system and carries out heat exchange from the refrigerant liquid of compression-type refrigerating system the first condensator outlet, absorption refrigeration agent liquid heat of vaporization, become in the absorber that enters the diffusion compression-type refrigerating system behind the ammonia steam and absorbed by the dilute ammonia solution from generator, enter in the generator again after becoming concentrated ammonia solution.
In the vapour compression refrigeration system side, from the superheated steam of the HTHP of compressor outlet in the generator of diffusion type refrigeration system after the evolution of heat, continue to enter in the first condenser and be condensed into refrigerant liquid, and then enter heat absorption evaporation in the first evaporimeter after the expansion valve throttling by the steam compression type refrigeration circulation after in heat exchanger (evaporimeter of diffusion compression-type refrigerating system), being cooled into the subcooled liquid larger for degree of supercooling, produce refrigerating capacity.
In diffusion absorption refrigeration ice and the steam compression type refrigeration combined cycle, because the heat for the superheated steam of the cold-producing medium of compressor outlet is fully used, can effectively reduce the condensation load of condenser, increase the effective area of heat exchanger, and can utilize to change part superheat section heat and got coldly, can increase the refrigerating capacity of vapour compression refrigeration system, improve the Energy Efficiency Ratio of vapor-compression refrigerant cycle, this operation for system is very favourable, can play obvious energy-saving effect.
Diffusion absorption refrigeration ice of the present invention and vapour compression refrigeration combined cycle power plant, as shown in Figure 1 and Figure 2, this device comprises compressor 1, generator 2, the first condensers 3, choke valve 4, the first evaporimeter 5, the second condenser 6, the second evaporimeters 7, gas heat-exchanger 8, absorber 9, reservoir 10, liquid heat exchanger 11, hydrogen gas tank 12.
The vapor-compression refrigerant cycle side, compressor 1 exhaust outlet links to each other with heat exchanger entrance in the generator 2, heat exchanger exit links to each other with the entrance of the first condenser 3, the export pipeline of the first condenser 3 links to each other with choke valve 4 entrances by the second evaporimeter 7, choke valve 4 outlets link to each other with the entrance of the first evaporimeter 5, the outlet of the first evaporimeter 5 links to each other with the air entry of compressor, finishes circulation.
In the diffusion absorption refrigeration ice circulation side, generator 2 top steam (vapor) outlets link to each other with the entrance of the second condenser 6, the first outlet a1 of the second condenser 6 links to each other with the second evaporimeter 7 entrances, the second outlet b1 of the second condenser 6 links to each other with hydrogen gas tank 12,7 outlets of the second evaporimeter link to each other with the first entrance a2 of gas heat-exchanger 8, gas heat-exchanger 8 first outlet b2 link to each other with reservoir 10 entrance a3, reservoir 10 first outlet b3 link to each other with solution heat exchanger 11 entrance c4, solution heat exchanger 11 second outlet d4 link to each other with airlift pump entrance a5 in the generator 2, reservoir 10 second outlet c3 link to each other with absorber 9 bottoms, absorber 9 tops one port b6 enters gas heat-exchanger 8 through gas heat-exchanger 8 second entrance c2, then out link to each other with hydrogen gas tank 12 from gas heat-exchanger 8 second outlet d2, the another port a6 of absorber 9 links to each other with the first outlet b4 of solution heat exchanger 11, and the entrance a4 of solution heat exchanger 11 links to each other with weak solution tank outlet b5 in the generator 2.
The airlift pump of pipe ring in generator 2 of the hyperthermia and superheating steam of compressor 1 outlet, the generator 2 of heating diffusion absorption type refrigeration system drives diffusion absorption type refrigeration system, the cold that the second evaporimeter 7 is produced in the diffusion absorption type refrigeration system increases the degree of supercooling of cold-producing medium in the vapor compression refrigeration system by the cold-producing medium that double pipe heat exchanger comes cooling steam compression refrigerating system the first condenser 3 to export.
In diffusion absorption refrigeration ice and vapour compression refrigeration combined unit, the vapor-compression refrigerant cycle side, from the superheated refrigerant steam of the HTHP of compressor 1 outlet in the generator 2 of diffusion type refrigeration system after the evolution of heat, continue to enter in the first condenser 3 and be condensed into refrigerant liquid, and then at the evaporimeter of heat exchanger 7(diffusion compression-type refrigerating system) in be cooled into the subcooled liquid larger into degree of supercooling after, enter heat absorption evaporation in the first evaporimeter 5 after expansion valve 4 throttlings by the steam compression type refrigeration circulation, produce refrigerating capacity.
In the diffusion absorption refrigeration ice side, the hyperthermia and superheating refrigerant vapour of compressor 1 outlet is by the concentrated ammonia solution in the generator 2 in the circulation of hot coil heating diffusion absorption refrigeration ice, concentrated solution start vaporizer.Above generator 2, steam and fraction ammonia condense into liquid, and flow to the weak solution tank, and weak solution enters in the middle of the absorber 9 through solution heat exchanger 11 heat exchange, and most of ammonia enters the second condenser 6.In the second condenser 6, the abundant condensation of ammonia, and form liquid state, and this process is exothermic process (fin of condenser plays thermolysis), liquid ammonia flows to the second evaporimeter 7 through the second condenser 6.Be flooded with hydrogen from hydrogen gas tank 12 at the second evaporimeter.Because the partial pressure of ammonia is lower, ammonia begins a large amount of volatilizations and is gas, with carry out heat exchange in the first condenser 3 cold-producing medium out, under Action of Gravity Field, enter reservoir 10 through gas heat-exchanger 8 from the second evaporimeter 7 ammonia hydrogen mixed gas out, then upwards flowed by absorber 9 bottoms, contact with top-down weak solution and constantly absorbed.Absorb to end, hydrogen is because being not soluted in water, and density is little, leaves from absorber 9 tops, enters hydrogen gas tank 12 through gas heat-exchanger 8, and concentrated solution is is so gone round and begun again through solution heat exchanger 11 inflow generators 2, has consisted of systemic circulation.
In diffusion absorption refrigeration ice and vapour compression refrigeration combined cycle power plant, take full advantage of the refrigerant superheat degree of compressor outlet, can effectively avoid the cold and hot energy waste that offsets, reduced the condensation load of condenser, increase the effective area of heat exchanger, and can utilize the overheated raising that obtains the vapor compression refrigeration system degree of supercooling, increased the refrigerating capacity of system, improve the Energy Efficiency Ratio of vapor-compression refrigerant cycle, can play obvious energy-saving effect.
The above only is preferred embodiments of the present invention; protection scope of the present invention is not limited with above-mentioned embodiment; as long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection domain of putting down in writing in claims.

Claims (2)

1. a diffusion absorption refrigeration ice and vapour compression refrigeration combined cycle power plant is characterized in that:
This device comprises compressor (1), generator (2), the first condenser (3), choke valve (4), the first evaporimeter (5), the second condenser (6), the second evaporimeter (7), gas heat-exchanger (8), absorber (9), reservoir (10), solution heat exchanger (11), hydrogen gas tank (12);
The vapor-compression refrigerant cycle side, compressor (1) exhaust outlet links to each other with heat exchanger entrance in the generator (2), heat exchanger exit links to each other with the entrance of the first condenser (3), the export pipeline of the first condenser (3) links to each other with choke valve (4) entrance by the second evaporimeter (7), choke valve (4) outlet links to each other with the entrance of the first evaporimeter (5), the outlet of the first evaporimeter (5) links to each other with the air entry of compressor, finishes circulation;
In the diffusion absorption refrigeration ice circulation side, generator (2) top steam (vapor) outlet links to each other with the entrance of the second condenser (6), the first outlet (a1) of the second condenser (6) links to each other with the second evaporimeter (7) entrance, the second outlet (b1) of the second condenser (6) links to each other with hydrogen gas tank (12), the second evaporimeter (7) outlet links to each other with first entrance (a2) of gas heat-exchanger (8), gas heat-exchanger (8) first outlets (b2) link to each other with reservoir (10) entrance (a3), reservoir (10) first outlets (b3) link to each other with solution heat exchanger (11) second entrances (c4), solution heat exchanger (11) second outlets (d4) link to each other with airlift pump entrance (a5) in the generator (2), reservoir (10) second outlets (c3) link to each other with absorber (9) bottom, absorber (9) top one port (b6) enters gas heat-exchanger (8) through gas heat-exchanger (8) second entrances (c2), then out link to each other with hydrogen gas tank (12) from gas heat-exchanger (8) second outlets (d2), the another port (a6) of absorber (9) links to each other with the first outlet (b4) of solution heat exchanger (11), and first entrance (a4) of solution heat exchanger (11) links to each other with weak solution tank outlet (b5) in the generator (2).
2. diffusion absorption refrigeration ice according to claim 1 and vapour compression refrigeration combined cycle power plant, it is characterized in that: the airlift pump of pipe ring in generator (2) of the hyperthermia and superheating steam of compressor (1) outlet, the generator (2) of heating diffusion absorption type refrigeration system drives diffusion absorption type refrigeration system, the cold-producing medium that the cold that the second evaporimeter (7) is produced in the diffusion absorption type refrigeration system comes cooling steam compression refrigerating system the first condenser (3) to export by double pipe heat exchanger, the degree of supercooling of cold-producing medium in the increase vapor compression refrigeration system.
CN 201110217820 2011-08-01 2011-08-01 Circulating device combining diffusing absorption-type refrigeration and vapor compression refrigeration Expired - Fee Related CN102322705B (en)

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CN102788446A (en) * 2012-08-30 2012-11-21 华北电力大学(保定) Adsorption type auxiliary heat pump refrigerating system driven by condensation heat
CN106064654B (en) * 2016-07-19 2019-05-28 江苏白雪电器股份有限公司 Direct current drive refrigerator car
CN109506391A (en) * 2018-12-21 2019-03-22 天津商业大学 Thermal drivers are without the Trans-critical cycle CO for pumping absorption auxiliary supercooling2Refrigeration system

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