CN103438598B - Based on folding type cooling system and the method for just inverse circulation coupling - Google Patents
Based on folding type cooling system and the method for just inverse circulation coupling Download PDFInfo
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- CN103438598B CN103438598B CN201310364418.6A CN201310364418A CN103438598B CN 103438598 B CN103438598 B CN 103438598B CN 201310364418 A CN201310364418 A CN 201310364418A CN 103438598 B CN103438598 B CN 103438598B
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Abstract
The invention discloses a kind of folding type cooling system based on just inverse circulation coupling and method, this system comprises power subcycle, absorption refrigeration subcycle and compression-type refrigeration subcycle, wherein in the employing of this system, low-temperature heat source drives power subcycle work done, the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration, power subcycle institute work drives compression-type refrigeration subcycle refrigeration, absorption refrigeration subcycle and compression-type refrigeration subcycle form folding type cooling system, absorption refrigeration subcycle works in high-temperature region, compression-type refrigeration subcycle works in low-temperature space, the condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.The input energy of whole system is middle low-temperature heat source, and output of products is low temperature cold.
Description
Technical field
The present invention relates to middle low-temperature heat source refrigeration technology field, particularly a kind of absorption-compression folding type cooling system based on just inverse circulation coupling and method.
Background technology
Ammonia absorption type refrigeration technology is a kind of Refrigeration Technique that cryogenic waste heat resource or the low temperature such as solar energy, underground heat regenerative resource can be utilized to drive, its refrigeration temperature levels is wide, be about 10 DEG C ~-60 DEG C, be widely used in air-conditioning, freezer, petroleum refining and other chemical processes.Single-stage ammonia absorption type refrigeration evaporating temperature is unsuitable too low, is suitable for air-conditioning, Cold storage in the refrigerator and some industrial department.But also have some industrial departments in addition, such as food-processing industry (quick-frozen, freeze drying, long-period freshness preserving etc. of food), some combustion gas (propane etc.) liquefaction, some low temperature environment laboratory and solid CO
2producing of (dry ice), the cold needing serviceability temperature lower (such as lower than-30 DEG C), now single-stage ammonia absorption type refrigeration has been difficult to meet the demands, needs to adopt twin-stage flow process.Dual-stage servo system is compared with single-stage circulation, and thermodynamic coefficient is lower, and system complex, and equipment is more, and metal wastage is comparatively large, runs also comparatively complicated in addition.For low temperature cold, industrial also can adopt superposition type compression refrigeration circulate obtain, but this cyclic high-temperature district and low-temperature space portion employing compression-type refrigeration circulate, a large amount of merit will be consumed.
Summary of the invention
(1) technical problem that will solve
In order to overcome the deficiency of existing twin-stage ammonia absorption type refrigeration system, the invention provides a kind of folding type cooling system based on just inverse circulation coupling and method, by by three comparatively simple subcycles, i.e. Rankine cycle, the circulation of single-stage ammonia absorption type refrigeration and compression-type refrigeration circulation, organically combine, in utilizing, low-temperature heat source obtains low temperature cold.
(2) technical scheme
In order to achieve the above object, the invention provides a kind of folding type cooling system based on just inverse circulation coupling, this system comprises power subcycle, absorption refrigeration subcycle and compression-type refrigeration subcycle, wherein in the employing of this system, low-temperature heat source drives power subcycle work done, the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration, power subcycle institute work drives compression-type refrigeration subcycle refrigeration, absorption refrigeration subcycle and compression-type refrigeration subcycle form folding type cooling system, absorption refrigeration subcycle works in high-temperature region, compression-type refrigeration subcycle works in low-temperature space, the condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.
In such scheme, described power subcycle comprises the high-pressure solution pump 1 being in turn connected into loop, steam generator 2, decompressor 3, reboiler 4 and the first condenser 5, wherein, solution S 1 from the first condenser 5 forms S2 after high-pressure pump 1 pressurizes, enter in steam generator 2, decompressor 3 expansion working is entered after being added thermosetting superheated vapor S3 by external heat source, decompressor 3 is vented S4 and enters reboiler 4 and the first condenser 5 successively, the high-temperature part of condensation heat is used for the heating process of solution in absorption refrigeration subcycle, the low temperature part of condensation heat is discharged to environment.
In such scheme, described high-pressure solution pump 1 is liquid pressing equipment, for improving fluid pressure; Described steam generator 2 and described reboiler 4 are fluid heat transfer equipment, for the exchange heat between cold and hot logistics; Described decompressor 3 is gas expansion work done equipment, and decompressor 3 utilizes high pressure high temperature vapor expansion working; Described first condenser 5 is condensing plants, for power cycle refrigerant vapor is carried out condensation, condensation heat release by cooling medium discharged to environment.
In such scheme; described absorption refrigeration subcycle comprises absorber 6, hypotonic solution pump 7, solution heat exchanger 8, rectifying column 9, second condenser 10, subcooler 11, ammonia choke valve 12, evaporator-condenser 13 and solution choke valve 14; wherein: the concentrated solution S6 from absorber 6 pressurizes through hypotonic solution pump 7, enter rectifying column 9 after solution heat exchanger 8 preheating, is separated into the tower reactor weak solution S9 of highly purified tower top ammonia steam S12 and low concentration; Tower reactor weak solution S9 first carries out again through solution choke valve 14 reducing pressure by regulating flow after heat recovery through solution heat exchanger 8, and the low pressure weak solution S11 of formation enters absorber 6; Tower top ammonia steam S12 enters subcooler 11 after entering and being condensed into liquefied ammonia S13 in the second condenser 10, with from after the low temperature ammonia steam S16 heat exchange of evaporator-condenser 13, form the liquefied ammonia S14 with certain degree of supercooling, after ammonia choke valve 12 reducing pressure by regulating flow, enter evaporator-condenser 13 evaporate, absorber 6 is entered after the low-temp low-pressure ammonia steam S16 formed carries out cold recovery in subcooler 11, absorbed by weak solution S11, again form concentrated solution S6.
In such scheme, described absorber 6 is gas-liquid mixed absorption equipments, adopts absorbent absorption refrigeration agent steam, absorption process institute thermal discharge by cooling medium discharged to environment; Described hypotonic solution pump 7 is liquid pressing equipment, for improving fluid pressure; Described solution heat exchanger 8 and described subcooler 11 are fluid heat transfer equipment, for the exchange heat between cold and hot logistics; Described rectifying column 9 for realizing the Separation & Purification of mixed working fluid, with the absorbent solution of obtained highly purified refrigerant vapour and low concentration; Described second condenser 10 is condensing plants, for refrigerant vapour is carried out condensation, condensation heat release by cooling medium discharged to environment; Described ammonia choke valve 12 and solution choke valve 14 are liquid throttling dropping equipments, are respectively used to the step-down realizing high-temperature region cold-producing medium ammonia and tower reactor solution; Described evaporator-condenser 13 is binding sites of absorption refrigeration subcycle and compression-type refrigeration subcycle, for evaporation of being absorbed heat wherein by high-temperature region cold-producing medium, to make the condensation of low-temperature space refrigerant vapour.
In such scheme, described compression-type refrigeration subcycle comprises compressor 15, CO
2choke valve 16, CO
2evaporimeter 17 and evaporator-condenser 13, wherein: compressor 15 compresses low-pressure refrigerant vapor S21 under the driving of the decompressor 3 of power subcycle, formed after high-pressure refrigerant vapor S18, S18 enter evaporator-condenser 13 and be condensed into liquid refrigerant CO
2, the condensation heat of this process is absorbed by the ammonia refrigerant in absorption refrigeration subcycle; The liquid CO of gained
2through CO
2cO is entered after choke valve 16 reducing pressure by regulating flow
2evaporimeter 17 sweat cooling, the low temperature cold obtained is the output of products of this folding type cooling system.
In such scheme, described compressor 15 is gas pressurized equipment, and for low-pressure refrigerant vapor compression is reached high pressure conditions, compressor 15 is connected by shaft coupling with decompressor 3, and the work done during compression that compressor 15 consumes is provided by decompressor 3; Described CO
2choke valve 16 is liquid throttling dropping equipments, for realizing low-temperature space cold-producing medium CO
2step-down; Described CO
2evaporimeter 17 is refrigeration parts of this cascade refrigeration system, for evaporation of being absorbed heat wherein by low-temperature space cold-producing medium, with obtained low temperature cold; Described evaporator-condenser 13 shares with described absorption refrigeration subcycle.
In such scheme, the energy of this folding type cooling system is input as the middle low temperature external heat source of industrial exhaust heat, solar energy or underground heat, and output of products is low temperature cold.
For achieving the above object, present invention also offers a kind of cascade refrigeration method based on just inverse circulation coupling, during the method adopts, low-temperature heat source drives power subcycle work done, the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration, and power subcycle institute work drives compression-type refrigeration subcycle to freeze again.Wherein, described absorption refrigeration subcycle and described compression-type refrigeration subcycle form folding type cooling system, and absorption refrigeration subcycle works in high-temperature region, and compression-type refrigeration subcycle works in low-temperature space; The condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.
(3) beneficial effect
From technique scheme, the present invention has following beneficial effect:
1, this folding type cooling system based on just inverse circulation coupling provided by the invention and method, with middle-low grade heat for thermal source, both can be industrial exhaust heat, also can be the regenerative resource of low temperature in solar energy, underground heat etc., to reach the object of energy-saving and emission-reduction; This system adopts ammonia water mixture and CO
2these two kinds of natural refrigerants are circulatory mediator, environment friendly and pollution-free.
2, this folding type cooling system based on just inverse circulation coupling provided by the invention and method; based on the power cycle of ammonia water mixture and Absorption Cooling System; carry out the heat energy inside and outside system; by middle low-temperature heat source first by power subcycle work done, institute's work drives compression-type refrigeration subcycle to freeze again; The heat extraction of power subcycle is used for absorption refrigeration; Absorption refrigeration subcycle and compression-type refrigeration subcycle form Cascade refrigeration cycle, and wherein Absorption heat-transformer works in high-temperature region, and compression periodic duty is in low-temperature space, and the two is combined by evaporator-condenser.The energy of whole system is input as middle low-temperature heat quantity, exports as low temperature cold.
3, this folding type cooling system based on just inverse circulation coupling provided by the invention and method; power subcycle take ammoniacal liquor as working medium; evaporation process temperature raises gradually, can carry out good Temperature Matching, reduce the irreversible loss of power working medium evaporation process with sensible heat thermal source; And power subcycle decompressor rejection temperature is higher, can utilize further in absorption refrigeration subcycle.
4, this folding type cooling system based on just inverse circulation coupling provided by the invention and method, flow process is simple, and each monotechnics is comparatively ripe, is convenient to industrialized utilization.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the folding type cooling system embodiment based on just inverse circulation coupling provided by the invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, Fig. 1 is the schematic diagram of the folding type cooling system embodiment based on just inverse circulation coupling provided by the invention.Wherein S1 to S21 represents cycle fluid.S22 and S23 represents heat source medium.This system comprises power subcycle, absorption refrigeration subcycle and compression-type refrigeration subcycle; wherein in the employing of this system, low-temperature heat source drives power subcycle work done; the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration; power subcycle institute work drives compression-type refrigeration subcycle refrigeration; absorption refrigeration subcycle and compression-type refrigeration subcycle form folding type cooling system; absorption refrigeration subcycle works in high-temperature region, and compression-type refrigeration subcycle works in low-temperature space; The condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.The energy of this folding type cooling system is input as the middle low temperature external heat source of industrial exhaust heat, solar energy or underground heat, and output of products is low temperature cold.
With reference to Fig. 1, power subcycle comprises the high-pressure solution pump 1, steam generator 2, decompressor 3, reboiler 4 and the first condenser 5 that are in turn connected into loop, wherein, solution S 1 from the first condenser 5 forms S2 after high-pressure pump 1 pressurizes, enter in steam generator 2, decompressor 3 expansion working is entered after being added thermosetting superheated vapor S3 by external heat source, decompressor 3 is vented S4 and enters reboiler 4 and the first condenser 5 successively, the high-temperature part of condensation heat is used for the heating process of solution in absorption refrigeration subcycle, the low temperature part of condensation heat is discharged to environment.
Wherein, high-pressure solution pump 1 is liquid pressing equipment, for improving fluid pressure; Steam generator 2 and described reboiler 4 are fluid heat transfer equipment, for the exchange heat between cold and hot logistics; Decompressor 3 is gas expansion work done equipment, and decompressor 3 utilizes high pressure high temperature vapor expansion working; First condenser 5 is condensing plants, for power cycle refrigerant vapor is carried out condensation, condensation heat release by cooling medium discharged to environment.
With reference to Fig. 1; absorption refrigeration subcycle comprises absorber 6, hypotonic solution pump 7, solution heat exchanger 8, rectifying column 9, second condenser 10, subcooler 11, ammonia choke valve 12, evaporator-condenser 13 and solution choke valve 14; wherein: the concentrated solution S6 from absorber 6 pressurizes through hypotonic solution pump 7, enter rectifying column 9 after solution heat exchanger 8 preheating, is separated into the tower reactor weak solution S9 of highly purified tower top ammonia steam S12 and low concentration; Tower reactor weak solution S9 first carries out again through solution choke valve 14 reducing pressure by regulating flow after heat recovery through solution heat exchanger 8, and the low pressure weak solution S11 of formation enters absorber 6; Tower top ammonia steam S12 enters subcooler 11 after entering and being condensed into liquefied ammonia S13 in the second condenser 10, with from after the low temperature ammonia steam S16 heat exchange of evaporator-condenser 13, form the liquefied ammonia S14 with certain degree of supercooling, after ammonia choke valve 12 reducing pressure by regulating flow, enter evaporator-condenser 13 evaporate, absorber 6 is entered after the low-temp low-pressure ammonia steam S16 formed carries out cold recovery in subcooler 11, absorbed by weak solution S11, again form concentrated solution S6.
Wherein, absorber 6 is gas-liquid mixed absorption equipments, adopts absorbent absorption refrigeration agent steam, absorption process institute thermal discharge by cooling medium discharged to environment; Hypotonic solution pump 7 is liquid pressing equipment, for improving fluid pressure; Solution heat exchanger 8 and described subcooler 11 are fluid heat transfer equipment, for the exchange heat between cold and hot logistics; Rectifying column 9 for realizing the Separation & Purification of mixed working fluid, with the absorbent solution of obtained highly purified refrigerant vapour and low concentration; Second condenser 10 is condensing plants, for refrigerant vapour is carried out condensation, condensation heat release by cooling medium discharged to environment; Ammonia choke valve 12 and solution choke valve 14 are liquid throttling dropping equipments, are respectively used to the step-down realizing high-temperature region cold-producing medium ammonia and tower reactor solution; Evaporator-condenser 13 is binding sites of absorption refrigeration subcycle and compression-type refrigeration subcycle, for evaporation of being absorbed heat wherein by high-temperature region cold-producing medium, to make the condensation of low-temperature space refrigerant vapour.
With reference to Fig. 1, described compression-type refrigeration subcycle comprises compressor 15, CO
2choke valve 16, CO
2evaporimeter 17 and evaporator-condenser 13, wherein: compressor 15 compresses low-pressure refrigerant vapor S21 under the driving of the decompressor 3 of power subcycle, formed after high-pressure refrigerant vapor S18, S18 enter evaporator-condenser 13 and be condensed into liquid refrigerant CO
2, the condensation heat of this process is absorbed by the ammonia refrigerant in absorption refrigeration subcycle; The liquid CO of gained
2through CO
2cO is entered after band stream valve 16 reducing pressure by regulating flow
2evaporimeter 17 sweat cooling, the low temperature cold obtained is the output of products of this folding type cooling system.
Wherein, compressor 15 is gas pressurized equipment, and for low-pressure refrigerant vapor compression is reached high pressure conditions, compressor 15 is connected by shaft coupling with decompressor 3, and the work done during compression that compressor 15 consumes is provided by decompressor 3; CO
2choke valve 16 is liquid throttling dropping equipments, for realizing low-temperature space cold-producing medium CO
2step-down; CO
2evaporimeter 17 is refrigeration parts of this cascade refrigeration system, for evaporation of being absorbed heat wherein by low-temperature space cold-producing medium, with obtained low temperature cold; Evaporator-condenser 13 shares with described absorption refrigeration subcycle.
Referring again to Fig. 1, high-pressure solution pump 1 exports and is connected with the first condenser 5 with steam generator 2, decompressor 3, reboiler 4 successively; Absorber 6 exports and is connected with rectifying column 9 with hypotonic solution pump 7, solution heat exchanger 8 successively; at the bottom of rectifying column 9 tower, taphole is connected with absorber 6 with reboiler 4, solution heat exchanger 8, solution choke valve 14 successively; the overhead vapours outlet of rectifying column 9 is connected with evaporator-condenser 13 with the second condenser 10, subcooler 11, choke valve 12 successively; evaporator-condenser 13 is connected with subcooler 11, and subcooler 11 is connected with absorber 6; Compressor 15 is connected by shaft coupling with decompressor 3, compressor 15 HCS outlet successively with evaporator-condenser 13, CO
2choke valve 16 and CO
2evaporimeter 17 is connected.
High-pressure solution pump 1 and hypotonic solution pump 7 are liquid pressing equipment, for improving fluid pressure.Steam generator 2, reboiler 4, solution heat exchanger 8 and subcooler 11 are fluid heat transfer equipment, for the exchange heat between cold and hot logistics.Decompressor 3 and compressor 15 are gas expansion work done and gas pressurized equipment respectively, and decompressor 3 utilizes high pressure high temperature vapor expansion working, and low-pressure refrigerant vapor compression is reached high pressure conditions by the merit that compressor 15 consumes decompressor 3 generation.First condenser 5 and the second condenser 10 are condensing plants, are respectively used to the refrigerant vapour in power cycle refrigerant vapor and absorption refrigeration subcycle to carry out condensation, condensation heat release by cooling medium discharged to environment.Absorber 6 is gas-liquid mixed absorption equipments, adopts absorbent absorption refrigeration agent steam, absorption process institute thermal discharge by cooling medium discharged to environment.Rectifying column 9 for realizing the Separation & Purification of mixed working fluid, with the absorbent solution of obtained highly purified refrigerant vapour and low concentration.Ammonia choke valve 12, solution choke valve 14 and CO
2choke valve 16 is liquid throttling dropping equipments, is respectively used to realize high-temperature region cold-producing medium ammonia, tower reactor solution and low-temperature space cold-producing medium CO
2step-down.Evaporator-condenser 13 is binding sites of two refrigeration subcycle, and friend is in evaporation of being absorbed heat wherein by high-temperature region cold-producing medium, so that the condensation of low-temperature space refrigerant vapour.CO
2evaporimeter 17 is refrigeration parts of this cascade refrigeration system, for evaporation of being absorbed heat wherein by low-temperature space cold-producing medium, with obtained low temperature cold.
During this folding type cooling system adopts, low-temperature heat source drives, and in this, low-temperature heat source can be industrial exhaust heat, solar energy or underground heat.In this folding type cooling system, the working media adopted in power subcycle and absorption refrigeration subcycle can be ammonia and device of working medium pair, but is not limited to ammonia and device of working medium pair, also can be other working medium pair; The working media adopted in compression-type refrigeration subcycle can be CO
2, but be not limited to CO
2, also can be other working medium.
The specific works flow process of this folding type cooling system is:
In power subcycle, solution S 1 from the first condenser 5 forms S2 after high-pressure pump 1 pressurizes, enter in steam generator 2, decompressor 3 expansion working is entered after being added thermosetting superheated vapor S3 by external heat source, expander exhaust gas S4 enters reboiler 4 and the first condenser 5 successively, successively the high-temperature part of condensation heat is used for the heating process of solution in absorption refrigeration subcycle, the low temperature part of condensation heat is discharged to environment.
In absorption refrigeration subcycle, the concentrated solution S6 from absorber 6 pressurizes through hypotonic solution pump 7, enter rectifying column 9 after solution heat exchanger 8 preheating, is separated into the tower reactor weak solution S9 of highly purified tower top ammonia steam S12 and low concentration; Tower reactor weak solution S9 first carries out again through solution choke valve 14 reducing pressure by regulating flow after heat recovery through solution heat exchanger 8, and the low pressure weak solution S11 of formation enters absorber 6; Tower top ammonia steam S12 enters subcooler 11 after entering and being condensed into liquefied ammonia S13 in the second condenser 10, with from after the low temperature ammonia steam S16 heat exchange of evaporator-condenser 13, form the liquefied ammonia S14 with certain degree of supercooling, after ammonia choke valve 12 reducing pressure by regulating flow, enter evaporator-condenser 13 evaporate, absorber 6 is entered after the low-temp low-pressure ammonia steam S16 formed carries out cold recovery in subcooler 11, absorbed by weak solution S11, again form concentrated solution S6.
In compression-type refrigeration subcycle, compressor 15 compresses low-pressure refrigerant vapor S21 under the driving of the decompressor 3 of power subcycle, is formed after high-pressure refrigerant vapor S18, S18 enter evaporator-condenser 13 and is condensed into liquid refrigerant CO
2, the condensation heat of this process is absorbed by the ammonia refrigerant in absorption refrigeration subcycle; The liquid CO of gained
2through CO
2cO is entered after choke valve 16 reducing pressure by regulating flow
2evaporimeter 17 sweat cooling, the low temperature cold obtained is the output of products of this folding type cooling system.Work in the work done during compression that the compressor 15 in the compression-type refrigeration subcycle of low-temperature space consumes to be provided by the decompressor 3 of power subcycle.Whole system only has middle low temperature external heat source to input, and does not need input work.
Based on the folding type cooling system based on just inverse circulation coupling shown in Fig. 1, present invention also offers a kind of cascade refrigeration method based on just inverse circulation coupling, with middle-low temperature heat or solar energy etc. for driving heat source.During the method adopts, low-temperature heat source drives power subcycle work done, and the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration, and power subcycle institute work drives compression-type refrigeration subcycle to freeze again.Absorption refrigeration subcycle and described compression-type refrigeration circulate and form folding type cooling system, and absorption refrigeration subcycle works in high-temperature region, and compression-type refrigeration subcycle works in low-temperature space; The condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.The energy of whole system is input as the middle low temperature external heat source comprising waste heat, solar energy or underground heat, and output of products is low temperature cold.
AspenPlus software is adopted to carry out analog computation to the present embodiment.Suppose in simulation that cooling water temperature is 30 DEG C, in absorption refrigeration subcycle, liquefied ammonia evaporating temperature is-15 DEG C; In evaporator-condenser, heat transfer temperature difference is 5 DEG C, i.e. CO
2cO in compression-type refrigeration subcycle
2condensation temperature is about-10 DEG C (pressure is 27bar); CO
2in evaporimeter, refrigeration evaporator temperature is about-63 DEG C (pressure is 3.7bar).Under this pressure ratio condition, CO
2compressor effect is 60.6%.Under base regime, system critical piece load and system performance parameter are in table 1.
| Project | Data |
| Heat source temperature, DEG C | 350 |
| Flue gas flow, kg/h | 3000 |
| Heat from heat source, kW | 275.5 |
| Coolant temperature, DEG C | 30 |
| Ammonia evaporating temperature, DEG C | -15 |
| CO 2Evaporating temperature, DEG C | -63 |
| Power subcycle working medium ammonia density | 0.3 |
| Absorption refrigeration subcycle concentrated solution ammonia density | 0.37 |
| Steam generator load, kW | 159.1 |
| Flue gas loss, kW | 116.4 |
| Decompressor amount of work, kW | 24.1 |
| Pump wasted work, kW | 2.1 |
| Compressor wasted work, kW | 22 |
| Reboiler, kw | 100.3 |
| First condenser duty, kW | 35.4 |
| Solution heat exchanger load, kW | 153.7 |
| Second condenser duty, kw | 59.1 |
| Subcooler load, kw | 7.3 |
| Evaporator-condenser load, kW | 57.9 |
| Absorber loading, kw | 87.3 |
| CO 2Load Evaporator, kW | 35.8 |
| Refrigerating capacity (-63 DEG C), kW | 35.8 |
| Compression-type refrigeration part COP C | 1.63 |
| Entire system COP | 0.23 |
| The entire system thermal efficiency, % | 13 |
Table 1
Table 1 is based on the folding type cooling system critical piece load of just inverse circulation coupling and system performance parameter under basic operating mode.
As can be seen from Table 1, when input heat source temperature, cooling water temperature and final cryogenic temperature are respectively 350 DEG C, 30 DEG C and-63 DEG C, input thermal source institute heat content is 275.5kW, when in power subcycle, in ammonia-water mixture concentration and absorption refrigeration subcycle, strong solution concentration is respectively 0.3 and 0.37, system exhaust gas temperature is 167.1 DEG C, steam generator caloric receptivity is 159.1kW, and the cold of final obtained-63 DEG C is 35.8kW.The compressor wasted work of compression-type refrigeration subcycle is the COP of 22kW, compression-type refrigeration part
cbe 1.63, the COP of overall folding type cooling system is 0.23; If consider flue gas loss (116.4kW), the overall thermal efficiency of system is 13%.This method does not need extra consumed work, only needs low-temperature heat quantity in consuming can obtain the cold of lower temperature.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the folding type cooling system based on just inverse circulation coupling, it is characterized in that, this system comprises power subcycle, absorption refrigeration subcycle and compression-type refrigeration subcycle, wherein in the employing of this system, low-temperature heat source drives power subcycle work done, the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration, power subcycle institute work drives compression-type refrigeration subcycle refrigeration, absorption refrigeration subcycle and compression-type refrigeration subcycle form folding type cooling system, absorption refrigeration subcycle works in high-temperature region, compression-type refrigeration subcycle works in low-temperature space, the condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.
2. the folding type cooling system based on just inverse circulation coupling according to claim 1, it is characterized in that, described power subcycle comprises the high-pressure solution pump (1) being in turn connected into loop, steam generator (2), decompressor (3), reboiler (4) and the first condenser (5), wherein, solution S 1 from the first condenser (5) forms S2 after high-pressure solution pump (1) pressurization, enter in steam generator (2), decompressor (3) expansion working is entered after being added thermosetting superheated vapor S3 by external heat source, decompressor (3) exhaust S4 enters reboiler (4) and the first condenser (5) successively, the high-temperature part of condensation heat is used for the heating process of solution in absorption refrigeration subcycle, the low temperature part of condensation heat is discharged to environment.
3. the folding type cooling system based on just inverse circulation coupling according to claim 2, is characterized in that,
Described high-pressure solution pump (1) is liquid pressing equipment, for improving fluid pressure;
Described steam generator (2) and described reboiler (4) are fluid heat transfer equipment, for the exchange heat between cold and hot logistics;
Described decompressor (3) is gas expansion work done equipment, and decompressor (3) utilizes high pressure high temperature vapor expansion working;
Described first condenser (5) is condensing plant, for power cycle refrigerant vapor is carried out condensation, condensation heat release by cooling medium discharged to environment.
4. the folding type cooling system based on just inverse circulation coupling according to claim 1, it is characterized in that, described absorption refrigeration subcycle comprises absorber (6), hypotonic solution pump (7), solution heat exchanger (8), rectifying column (9), the second condenser (10), subcooler (11), ammonia choke valve (12), evaporator-condenser (13) and solution choke valve (14), wherein:
Concentrated solution S6 from absorber (6) enters rectifying column (9) after hypotonic solution pump (7) pressurization, solution heat exchanger (8) preheating, is separated into the tower reactor weak solution S9 of highly purified tower top ammonia steam S12 and low concentration;
Tower reactor weak solution S9 first carries out again through solution choke valve (14) reducing pressure by regulating flow after heat recovery through solution heat exchanger (8), and the low pressure weak solution S11 of formation enters absorber (6);
Tower top ammonia steam S12 enters subcooler (11) after entering and being condensed into liquefied ammonia S13 in the second condenser (10), with from after the low temperature ammonia steam S16 heat exchange of evaporator-condenser (13), form the liquefied ammonia S14 with certain degree of supercooling, evaporator-condenser (13) evaporation is entered after ammonia choke valve (12) reducing pressure by regulating flow, absorber (6) is entered after the low-temp low-pressure ammonia steam S16 formed carries out cold recovery in subcooler (11), absorbed by weak solution S11, again form concentrated solution S6.
5. the folding type cooling system based on just inverse circulation coupling according to claim 4, is characterized in that,
Described absorber (6) is gas-liquid mixed absorption equipment, adopts absorbent absorption refrigeration agent steam, absorption process institute thermal discharge by cooling medium discharged to environment;
Described hypotonic solution pump (7) is liquid pressing equipment, for improving fluid pressure;
Described solution heat exchanger (8) and described subcooler (11) are fluid heat transfer equipment, for the exchange heat between cold and hot logistics;
Described rectifying column (9) for realizing the Separation & Purification of mixed working fluid, with the absorbent solution of obtained highly purified refrigerant vapour and low concentration;
Described second condenser (10) is condensing plant, for refrigerant vapour is carried out condensation, condensation heat release by cooling medium discharged to environment;
Described ammonia choke valve (12) and solution choke valve (14) are liquid throttling dropping equipments, are respectively used to the step-down realizing high-temperature region cold-producing medium ammonia and tower reactor solution;
Described evaporator-condenser (13) is the binding site of absorption refrigeration subcycle and compression-type refrigeration subcycle, for evaporation of being absorbed heat wherein by high-temperature region cold-producing medium, to make the condensation of low-temperature space refrigerant vapour.
6. the folding type cooling system based on just inverse circulation coupling according to claim 1, it is characterized in that, described compression-type refrigeration subcycle comprises compressor (15), CO
2choke valve (16), CO
2evaporimeter (17) and evaporator-condenser (13), wherein:
Compressor (15) compresses low-pressure refrigerant vapor S21 under the driving of the decompressor (3) of power subcycle, is formed after high-pressure refrigerant vapor S18, S18 enter evaporator-condenser (13) and is condensed into liquid refrigerant CO
2, the condensation heat of this process is absorbed by the ammonia refrigerant in absorption refrigeration subcycle; The liquid CO of gained
2through CO
2cO is entered after choke valve (16) reducing pressure by regulating flow
2evaporimeter (17) sweat cooling, the low temperature cold obtained is the output of products of this folding type cooling system.
7. the folding type cooling system based on just inverse circulation coupling according to claim 6, is characterized in that,
Described compressor (15) is gas pressurized equipment, for low-pressure refrigerant vapor compression is reached high pressure conditions, compressor (15) is connected by shaft coupling with decompressor (3), and the work done during compression that compressor (15) consumes is provided by decompressor (3);
Described CO
2choke valve (16) is liquid throttling dropping equipment, for realizing low-temperature space cold-producing medium CO
2step-down;
Described CO
2evaporimeter (17) is the refrigeration part of this cascade refrigeration system, for evaporation of being absorbed heat wherein by low-temperature space cold-producing medium, with obtained low temperature cold;
Described evaporator-condenser (13) shares with described absorption refrigeration subcycle.
8. the folding type cooling system based on just inverse circulation coupling according to claim 1, it is characterized in that, the energy of this folding type cooling system is input as the middle low temperature external heat source of industrial exhaust heat, solar energy or underground heat, and output of products is low temperature cold.
9. the cascade refrigeration method based on just inverse circulation coupling, be applied to the folding type cooling system according to any one of claim 1 to 8, it is characterized in that, during the method adopts, low-temperature heat source drives power subcycle work done, the heat extraction of power subcycle drives absorption refrigeration subcycle refrigeration, and power subcycle institute work drives compression-type refrigeration subcycle to freeze again.
10. the cascade refrigeration method based on just inverse circulation coupling according to claim 9, it is characterized in that, described absorption refrigeration subcycle and described compression-type refrigeration subcycle form folding type cooling system, absorption refrigeration subcycle works in high-temperature region, and compression-type refrigeration subcycle works in low-temperature space; The condensation process of the compression-type refrigeration subcycle that the sweat cooling process of the absorption refrigeration subcycle of high-temperature region is low-temperature space provides cooling load, and the two is combined by evaporator-condenser.
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| CN109883078A (en) * | 2019-01-23 | 2019-06-14 | 山东科技大学 | A kind of cascade refrigeration system |
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