CN102798247B - Low-grade-energy drive CO2 absorption refrigeration system - Google Patents

Low-grade-energy drive CO2 absorption refrigeration system Download PDF

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Publication number
CN102798247B
CN102798247B CN201210289216.5A CN201210289216A CN102798247B CN 102798247 B CN102798247 B CN 102798247B CN 201210289216 A CN201210289216 A CN 201210289216A CN 102798247 B CN102798247 B CN 102798247B
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China
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module
absorption
cold
refrigerant
producing medium
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CN102798247A (en
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何丽娟
黄军
李娜
钟金山
王丽芳
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Inner Mongolia University of Science and Technology
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Inner Mongolia University of Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

Abstract

The invention discloses a low-grade-energy drive CO2 absorption refrigeration system, in particular to a refrigeration system taking low grade energy as a drive heat source, and belongs to the refrigeration field. The low-grade-energy drive CO2 absorption refrigeration system is jointly driven by high-temperature low-grade heat and low-temperature low-grade heat and comprises a high temperature generator, a low temperature generation module, a condensation module, an evaporator, an absorption evaporation module, an absorption module, an energy recovery heat exchanger, a first heat regenerator, a second heat regenerator, a solution pump and a pressure reduction device. The utility model has the advantages that the refrigeration efficiency of the low-grade-energy drive CO2 absorption refrigeration system is improved, peripheral equipment of the low-grade-energy drive CO2 absorption refrigeration system is simplified, the stability reliability of the low-grade-energy drive CO2 absorption refrigeration system is improved, the unstable and discontinuous low-grade energy is efficiently used, and a foundation is laid for the efficient utilization of the low-grade-energy in the refrigeration field of air conditioners.

Description

Low-grade energy drives CO2 absorption system
Technical field:
The present invention relates to a kind of low-grade energy and drive CO 2absorption system, specifically a kind of refrigeration system using low-grade energy as driving heat source, belongs to refrigerating field.
Background technology:
Improve constantly with popular life quality along with social economy develops rapidly, refrigeration air-conditioner is just becoming one of current urban family domestic and industrial necessity.The refrigeration working medium of air-conditioning equipment adopts the conventional refrigerants such as freon mostly, defect in environmental problem shows especially day by day, in addition for maintain the electric power of air-conditioning refrigeration system day-to-day operation be the whole world 15%, so the serious problems such as the energy and environment caused by air conditioner refrigerating threaten environment for human survival and the mankind the sustainable development of the earth of living, so effective exploitation natural refrigerant and effectively utilize low-grade energy, for improving energy resource structure and environmental problem, there is very large Social and economic benef@.
The cooling cycle system of the environmental problem caused for conventional refrigerants and conventional low-grade energy particularly Driven by Solar Energy, be made up of generator, condenser, evaporimeter, absorber and solution heat exchanger, the existence of this system is high to heat source temperature requirement, efficiency is low, be difficult to the problem of continous-stable running.
Summary of the invention
The object of this invention is to provide a kind of energy-conservation, consumption reduction, the low-grade energy of environmental protection drives CO 2absorption system.
Technical solution:
The CO that low-grade energy of the present invention drives 2absorption system, comprise: high-temperature generator, condensation module, evaporimeter, absorption module, first solution pump, first regenerator, refrigerant charge working medium pair, it is characterized in that, also comprise low temperature generation module, absorb evaporation module, second regenerator, second solution pump, high-temperature generator refrigerant outlet is connected with the entrance of condensation module respectively with low temperature generation modular refrigeration agent outlet, condensation module cold-producing medium first exports I and is connected with evaporator refrigerant entrance, evaporator refrigerant outlet is evaporated module refrigerant inlet with absorption and is connected, condensation module cold-producing medium second exports II and evaporates module refrigerant inlet be connected with absorption, absorb evaporation module refrigerant outlet to be connected with absorption module refrigerant inlet.
Described low temperature generation modular refrigeration agent second exports IV and absorbs evaporation module refrigerant outlet and is connected with absorption module refrigerant inlet.
Described condensation module cold-producing medium second exports II and is connected with energy recovering heat exchanger refrigerant inlet, and energy recovering heat exchanger refrigerant outlet evaporates module refrigerant inlet with absorption and is connected.
The present invention comprises further: comprise high-temperature generator, condensation module, evaporimeter, absorption module, first regenerator, first solution pump, refrigerant charge working medium pair, it is characterized in that, also comprise low temperature generation module, second regenerator, second solution pump, absorb evaporation module, condensation module cold-producing medium second exports II and evaporates module refrigerant inlet be connected with absorption, evaporator refrigerant outlet VI evaporates module refrigerant inlet with absorption and is connected, the agent outlet of low temperature generation modular refrigeration and evaporator refrigerant outlet V are connected with injector entrance respectively, absorb evaporation module refrigerant outlet to be connected with absorption module refrigerant inlet.
Described low temperature generation module has cryogenerator and control valve, and cryogenerator refrigerant outlet is connected with control valve entrance.
Described condensation module has condenser and dropping equipment, and condenser refrigerant outlet is connected with dropping equipment entrance.
Described absorption evaporation module has absorption evaporimeter, control valve, cryogenic fluid storage tank; Absorb the outlet of evaporator refrigerant mother solution to be connected with cryogenic fluid fluid reservoir entrance through control valve.
Described absorption module has absorber, pyrosol storage tank, control valve; The outlet of absorber cold-producing medium mother solution is connected with pyrosol reservoir inlet through control valve.
The cold-producing medium of described refrigerant charge working medium centering adopts natural refrigerant CO 2; Absorbent adopts absorption refrigeration agent CO 2ionic liquid, NHD, amine liquid or mixed amine liquid.
High-temperature generator of the present invention, cryogenerator, absorber, evaporimeter, absorption evaporimeter, condenser, the first regenerator, the second regenerator, recuperator are heat exchanger, heat exchanger is shell and tube, immersion or fountain, and the heat exchanger tube in heat exchanger adopts common tube or thermoexcell.
The CO that low-grade energy of the present invention drives 2absorption system adopts with natural refrigerant CO 2for cold-producing medium, ionic liquid, NHD, amine liquid or mixed amine liquid are the refrigerant charge working medium pair of absorbent, wherein natural refrigerant CO 2can not impact environment, be a kind of excellent refrigeration working medium, CO 2study more in compression refrigerating system as cold-producing medium.CO can be absorbed when low-temp low-pressure owing to being difficult to seek 2, during HTHP, discharge CO 2absorbent, therefore Chinese scholars is to CO 2absorbent refrigeration system research as cold-producing medium is little.Along with the further investigation to ionic liquid, find that ionic liquid, NHD, amine liquid or mixed amine liquid are to CO 2there is very high solubility, therefore for realizing with CO 2for cold-producing medium, ionic liquid is that the absorbent refrigeration system of absorbent is laid a good foundation.
According to the cascaded utilization of energy principle of hot-cast socket system, the present invention proposes the CO that is specially adapted to low-grade driving 2absorption system, and low-grade energy driving CO can be simplified 2the ancillary equipment of absorption system, reduces low-grade energy and drives CO 2the volume of absorption system, reduces low-grade energy and drives CO 2the cost of absorption system, improves low-grade energy and drives CO 2the reliability of absorption system, has increased substantially low-grade energy and has driven CO 2the refrigerating efficiency of absorption system.The present invention is specially adapted to the CO that low-grade energy drives 2absorption system, for the efficiency utilization of the low-grade energy such as solar energy, underground heat lays the foundation.
The beneficial effect that the present invention has:
1) the present invention is using low-grade energy as driving heat source, utilize cascaded utilization of energy principle, sacrifice the low-grade cold that low temperature low-grade heat drives absorption refrigeration cycle to produce, achieve the conversion of cold product interdigit, realize the efficient conversion of low-grade energy.
2) this invention simplifies low-grade energy and drive CO 2the ancillary equipment of absorption system, reduces low-grade energy and drives CO 2the volume of absorption system, reduces low-grade energy and drives CO 2the cost of absorption system, improves low-grade energy and drives CO 2the reliability of absorption system.
3) the present invention is specially adapted to the efficiency utilization of instability, discontinuous low-grade energy, especially solar energy, the utilization of underground heat equal energy source in air conditioner refrigerating field.
Accompanying drawing illustrates:
Fig. 1 is the CO that low-grade pair of thermal source drives 2absorption system structural representation;
Fig. 2 is the embodiment of the present invention 1 structural representation;
Fig. 3 is the embodiment of the present invention 2 structural representation;
Fig. 4 is the embodiment of the present invention 3 structural representation.
Detailed description of the invention
Embodiment 1
Fig. 1 is embodiments of the invention 1, i.e. the CO of low-grade pair of thermal source driving 2absorption system basic structure schematic diagram.As shown in Figure 1, comprise high-temperature generator 1, low temperature generation module 2, condensation module 3, evaporimeter 4, absorb evaporation module 5, absorption module 6, first regenerator 7, second regenerator 8, second solution pump 9, first solution pump 10, dropping equipment 14, high-temperature generator 1 refrigerant outlet, low temperature generation module 2 refrigerant outlet is connected with the entrance of condensation module 3 respectively, condensation module 3 cold-producing medium first exports I and is connected with evaporimeter 4 refrigerant inlet, evaporimeter 4 refrigerant outlet evaporates module 5 refrigerant inlet with absorption and is connected, condensation module 3 cold-producing medium second exports II and evaporates module 5 refrigerant inlet be connected with absorption, absorb evaporation module 5 refrigerant outlet to be connected with absorption module 6 refrigerant inlet, the outlet of absorption module 6 cold-producing medium mother solution is connected with the first solution pump 10 entrance, first solution pump 10 outlet is connected with the entrance of the first regenerator 7 cold-producing medium mother solution, first regenerator 7 cold-producing medium mother solution outlet is connected with high-temperature generator 1 cold-producing medium mother solution entrance, the outlet of high-temperature generator 1 cold-producing medium barren solution is connected with the first regenerator 7 cold-producing medium barren solution entrance, first regenerator 7 cold-producing medium barren solution outlet is connected with absorption module 6 cold-producing medium barren solution entrance through control valve 22, absorb the outlet of evaporation module 5 cold-producing medium mother solution to be connected with the second solution pump 9 entrance, second solution pump 9 exports and is connected with the second regenerator 8 cold-producing medium mother solution entrance, second regenerator 8 cold-producing medium mother solution outlet is connected with low temperature generation module 2 cold-producing medium mother solution entrance, the outlet of low temperature generation module 2 cold-producing medium barren solution is connected with the second regenerator 8 cold-producing medium barren solution entrance, and the second regenerator 8 cold-producing medium barren solution outlet is evaporated module 5 cold-producing medium barren solution entrance through control valve 18 with absorption and is connected.
Described low temperature generation module 2 has cryogenerator 11 and control valve 12, and cryogenerator 11 refrigerant outlet is connected with control valve 12 entrance.
Described condensation module 3 has condenser 13 and dropping equipment 14, and condenser 13 refrigerant outlet is connected with dropping equipment 14 entrance.
Described absorption evaporation module 5 has absorption evaporimeter 15, control valve 16, cryogenic fluid storage tank 17; Absorb the outlet of evaporimeter 15 cold-producing medium mother solution to be connected with cryogenic fluid fluid reservoir 17 entrance through control valve 16.
Described absorption module 6 has absorber 19, pyrosol storage tank 20, control valve 21; The outlet of absorber 19 cold-producing medium mother solution is connected with pyrosol storage tank 20 entrance through control valve 21.
Described refrigerant charge working medium is to employing natural refrigerant CO 2for cold-producing medium, ionic liquid, NHD, amine liquid or mixed amine liquid are absorbent.
The present embodiment is with natural refrigerant CO 2for cold-producing medium, ionic liquid [emim] [Tf 2n] for absorbent is illustrated, its specific works principle is summarized as follows:
The supercritical CO of effusion from high-temperature generator 1 2gases at high pressure, are condensed into gas-fluid two-phase mixture in condenser 13, and after reducing pressure by regulating flow, cooling, a point two-way leaves.The CO of one road low-temp low-pressure 2liquid evenly to spray in evaporimeter 4 and at this evaporation endothermic through spray thrower, CO 2gas absorption evaporimeter 15 in by the weak solution from cryogenerator 11 (containing cold-producing medium CO 2lean solution) absorb, release heat, become and be rich in CO 2[emim] [Tf 2n] mix concentrated solution and pump into cryogenerator 11 through the second solution pump 9 and the second regenerator 8, become weak solution produce higher temperature refrigerant gas under the effect of low-grade Low Temperature Thermal after, carry out the circulation of cryogenic refrigeration of lower cycle unit.
The CO of another road low-temp low-pressure 2liquid, in absorption evaporimeter 15, becomes the CO of higher temperature after absorbing the former liberated heat 2gas, by the CO from high-temperature generator 1 in absorber 19 2-[emim] [Tf 2n] mix weak solution (containing cold-producing medium CO 2lean solution) absorb, release heat.Now, become and be rich in CO 2[emim] [Tf 2n] mix concentrated solution and pump into high-temperature generator 1 through the first solution pump 10 and the first regenerator 7, under the effect of low-grade high-temperature hot, produce high temperature CO 2gas becomes weak solution, carries out the high-temperature refrigeration unit circulation of lower cycle.
Above-mentioned generator, absorber, evaporimeter, condenser, the first regenerator mentioned, the second regenerator is heat exchanger, and its form adopts shell and tube or immersion or fountain, and its heat exchanger tube adopts common tube or thermoexcell.
Absorbing evaporimeter is a heat exchanger, adopts single channel, two passages or multichannel shell and tube.
Dropping equipment adopts U-tube, capillary or choke valve.
The effect of solution pump improves fluid pressure, conveying liquid, and solution pump is canned motor pump, magnetic force driving pump, membrane pump, one of centrifugal pump or gear pump.
Control valve adopts automatic valve or hand-operated valve, for controlling the flow regime of gas phase and liquid phase.
Embodiment 2
Fig. 2 is embodiments of the invention 2.In order to solve high temperature heat source under-supply time, CO 2the problem of gas generating capacity deficiency, the present embodiment is by from the higher CO of low temperature generation module 2 outlet temperature 2refrigerant gas Zhong mono-tunnel is as the supplementary vapour source of circulation, and another road and absorbing evaporate to enter in absorption module 6 together with module 5 higher temperature refrigerant gas out and absorbed, and ensures system stability work, reduces circulating ratio, the COP of raising system with this.
As shown in Figure 2, comprise high-temperature generator 1, low temperature generation module 2, condensation module 3, evaporimeter 4, absorb evaporation module 5, absorption module 6, first regenerator 7, second regenerator 8, second solution pump 9, first solution pump 10, high-temperature generator 1 refrigerant outlet, low temperature generation module 2 cold-producing medium first exports III and is connected with condensation module 3 refrigerant inlet respectively, second outlet IV evaporates module 5 refrigerant outlet with absorption and is connected, condensation module 3 cold-producing medium first exports I and is connected with evaporimeter 4 refrigerant inlet, evaporimeter 4 refrigerant outlet evaporates module 5 refrigerant inlet with absorption and is connected, condensation module 3 cold-producing medium second exports II and evaporates module 5 refrigerant inlet be connected with absorption, absorption evaporation module 5 refrigerant outlet and low temperature generation module 2 cold-producing medium second export IV and are connected with absorption module 6 refrigerant inlet, the outlet of absorption module 6 cold-producing medium mother solution is connected through the entrance of control valve 22 with the first regenerator 7 cold-producing medium mother solution, first regenerator 7 cold-producing medium mother solution outlet is connected with high-temperature generator 1 cold-producing medium mother solution entrance, the outlet of high-temperature generator 1 cold-producing medium barren solution is connected with the first regenerator 7 cold-producing medium barren solution entrance, first regenerator 7 cold-producing medium barren solution exports the first solution pump 10 entrance and is connected, first solution pump 10 outlet is connected with absorption module 6 cold-producing medium barren solution entrance, absorb the outlet of evaporation module 5 cold-producing medium mother solution to be connected with the second solution pump 9 entrance, second solution pump 9 exports and is connected with the second regenerator 8 cold-producing medium mother solution entrance, second regenerator 8 cold-producing medium mother solution outlet is connected with low temperature generation module 2 cold-producing medium mother solution entrance, the outlet of low temperature generation module 2 cold-producing medium barren solution is connected with the second regenerator 8 cold-producing medium barren solution entrance, and the second regenerator 8 cold-producing medium barren solution outlet is evaporated module 5 cold-producing medium barren solution entrance through control valve 18 with absorption and is connected.
Described low temperature generation module 2 cold-producing medium second exports IV and evaporates module 5 refrigerant outlet be connected with absorption.
Above-mentioned mention low temperature generation module 2, condensation module 3, absorb evaporation module 5, absorption module 6 and refrigerant charge working medium to identical with content described in embodiment 1.
The present embodiment take natural refrigerant as cold-producing medium, MDEA amine liquid or MDEA+TETA mixed amine liquid are illustrated for absorbent, and its operation principle is summarized as follows:
Cold-producing medium rich solution (is rich in CO 2mDEA amine liquid) in high-temperature generator 1, heated (temperature range is at 70 DEG C-100 DEG C) be vaporizated into high pressure superheater state refrigerant vapour, entering condenser 13 medium condenses that is cooled as working gas becomes refrigerant liquid to be divided into two-way, the cold-producing medium of one tunnel after choke valve 14 step-down cooling evenly sprays in evaporimeter 4 evaporation endothermic at a lower temperature through spray thrower, and then gaseous refrigerant enters and absorbs evaporimeter 15 by the cold-producing medium lean solution from cryogenerator 11 (containing a small amount of CO 2mDEA amine liquid) absorb, then cold-producing medium rich solution is pumped in cryogenerator 11 by the second solution pump 9 and is heated (temperature range is at 40 DEG C-80 DEG C) and be vaporized into higher pressure higher temperature refrigerant vapour, gas bifurcation as a supplement, one when high temperature heat source under-supply high-temperature generator 1 generating capacity is not enough, this refrigerant vapour through control valve 12 is as the supplementary vapour source of circulating, guarantee system stability works, another to be mixed in absorber 19 with the low pressure refrigerant vapor carrying out self-absorption evaporimeter 15 through control valve 13 and to be absorbed heat release under elevated pressure conditions, the heat medium that is cooled is taken away, become cold-producing medium rich solution and pumped into high-temperature generator 1 by the first solution pump 10, repeat above-mentioned circulation.
The above-mentioned generator, absorber, condenser, evaporimeter, the first regenerator, the second regenerator, absorption evaporimeter etc. mentioned is heat exchanger, and dropping equipment, solution pump are identical with the performance in embodiment 1 with control valve.
Embodiment 3
Fig. 3 is embodiments of the invention 3.In order to effectively reduce the cold-producing medium CO leaving condensation module 3 2temperature, therefore export at condensation module 3 cold-producing medium second cold that II, refrigerating medium outlet and cooling medium porch increase energy recovering heat exchanger 25 reclaim refrigerating medium and cooling medium, circulating ratio and absorber outlet solution temperature is more effectively reduced, the COP of further raising system with this.
As shown in Figure 3, comprise high-temperature generator 1, low temperature generation module 2, condensation module 3, evaporimeter 4, absorb evaporation module 5, absorption module 6, first regenerator 7, second regenerator 8, second solution pump 9, first solution pump 10, energy recovering heat exchanger 25, high-temperature generator 1 refrigerant outlet, low temperature generation module 2 cold-producing medium first export III and are connected with the refrigerant inlet of condensation module 3 respectively, and the second outlet IV evaporates module 5 refrigerant outlet with absorption and is connected; condensation module 3 cold-producing medium first exports I and is connected with evaporimeter 4 refrigerant inlet, evaporimeter 4 refrigerant outlet evaporates module 5 refrigerant inlet with absorption and is connected, condensation module 3 cold-producing medium second exports II and is connected with energy recovering heat exchanger 25 refrigerant inlet, energy recovering heat exchanger 25 refrigerant outlet evaporates module 5 refrigerant inlet with absorption and is connected, absorption evaporation module 5 refrigerant outlet and low temperature generation module 2 cold-producing medium second export IV and are connected with absorption module 6 refrigerant inlet, the outlet of absorption module 6 cold-producing medium mother solution is connected through the entrance of control valve 22 with the first regenerator 7 cold-producing medium mother solution, first regenerator 7 cold-producing medium mother solution outlet is connected with high-temperature generator 1 cold-producing medium mother solution entrance, the outlet of high-temperature generator 1 cold-producing medium barren solution is connected with the first regenerator 7 cold-producing medium barren solution entrance, first regenerator 7 cold-producing medium barren solution exports the first solution pump 10 entrance and is connected, first solution pump 10 outlet is connected with absorption module 6 cold-producing medium barren solution entrance, absorb the outlet of evaporation module 5 cold-producing medium mother solution to be connected with the second solution pump 9 entrance, second solution pump 9 exports and is connected with the second regenerator 8 cold-producing medium mother solution entrance, second regenerator 8 cold-producing medium mother solution outlet is connected with low temperature generation module 2 cold-producing medium mother solution entrance, the outlet of low temperature generation module 2 cold-producing medium barren solution is connected with the second regenerator 8 cold-producing medium barren solution entrance, and the second regenerator 8 cold-producing medium barren solution outlet is evaporated module 5 cold-producing medium barren solution entrance through control valve 18 with absorption and is connected.
The cold-producing medium second of described condensation module 3 exports II and is connected with energy recovering heat exchanger 25 entrance, and energy recovering heat exchanger 25 outlet is evaporated module 5 refrigerant inlet with absorption and is connected.
Energy recovering heat exchanger 25 is heat exchangers, there are coolant guiding channel, refrigerant passage and high-temperature refrigeration unit style coolant channel, its form is two passages or multichannel shell and tube, shell-and-tube or fountain etc., and its heat exchanger tube can be common tube or thermoexcell.
Above-mentioned mention low temperature generation module 2, condensation module 3, absorb evaporation module 5, absorption module 6 and refrigerant charge working medium to identical with the described content in embodiment 1 or embodiment 2.
The present embodiment is with natural refrigerant CO 2for cold-producing medium, NHD are that absorbent is illustrated, its idiographic flow is summarized as follows: cold-producing medium rich solution (is rich in CO 2nHD mixed solution) in high-temperature generator 1, heated (temperature range is at 90 DEG C-120 DEG C) be vaporizated into high pressure superheater state refrigerant vapour, entering condenser 13 medium condenses that is cooled as working gas becomes refrigerant liquid to be divided into two-way, the cold-producing medium of one tunnel after choke valve 14 step-down cooling evenly sprays in evaporimeter 4 evaporation endothermic at a lower temperature through spray thrower, and then gaseous refrigerant enters and absorbs evaporimeter 15 by the cold-producing medium lean solution from cryogenerator 11 (containing a small amount of CO 2nHD mixed solution) absorb, then cold-producing medium rich solution is pumped in cryogenerator 11 by the second solution pump 9 and is heated (temperature range is at 50 DEG C-90 DEG C) and be vaporized into higher pressure higher temperature refrigerant vapour, gas bifurcation as a supplement, one when high temperature heat source under-supply high-temperature generator 1 generating capacity is not enough, this refrigerant vapour through control valve 12 is as the supplementary vapour source of circulating, guarantee system stability works, another to be mixed in absorber 19 with the low pressure refrigerant vapor carrying out self-absorption evaporimeter 15 through control valve 13 and to be absorbed under elevated pressure conditions, to reduce circulating ratio, the COP of raising system.Another road enters after energy recovering heat exchanger 25 heat exchange through control valve 24 becomes subcooled liquid, then enter and absorb evaporimeter 15 evaporation endothermic, be vaporizated into low pressure refrigerant vapor, the low pressure refrigerant vapor of outflow absorption evaporimeter 15 and another gaseous refrigerant from cryogenerator 2 are mixed into absorber 19 and are absorbed heat release under elevated pressure conditions by the cold-producing medium lean solution from high-temperature generator 1, the heat medium (temperature range is at-5 DEG C-0 DEG C) that is cooled is taken away, become cold-producing medium rich solution and pumped into high-temperature generator 1 by the first solution pump 10, repeat above-mentioned circulation.
Above-mentioned mention generator, absorber, condenser, evaporimeter, the first regenerator, the second regenerator, absorb evaporimeter, energy recovering heat exchanger etc. be heat exchanger, dropping equipment, solution pump are identical with the performance in embodiment 1 with control valve.
Embodiment 4
Fig. 4 is embodiments of the invention 4.In order to effectively improve the absorption pressure of absorber 19, increase cold-producing medium CO 2uptake in absorption module 6, therefore place injector 26 at the refrigerant outlet place of low temperature generation module 2, in order to improve the outlet pressure leaving low temperature generation module 2 cold-producing medium, reduce circulating ratio with this, improve the COP of system.
As shown in Figure 4, comprise high-temperature generator 1, low temperature generation module 2, condensation module 3, evaporimeter 4, absorb evaporation module 5, absorption module 6, first regenerator 7, second regenerator 8, second solution pump 9, first solution pump 10, injector 26, low temperature generation module 2 refrigerant outlet and evaporimeter 4 refrigerant outlet V are connected with injector 26 entrance respectively, high-temperature generator 1 refrigerant outlet is connected with condensation module 3 entrance, and condensation module 3 cold-producing medium first exports I and is connected with evaporimeter 4 refrigerant inlet, evaporimeter 4 refrigerant outlet VI evaporates module 5 refrigerant inlet with absorption and is connected, condensation module 3 cold-producing medium second exports II and evaporates module 5 refrigerant inlet be connected with absorption, absorption evaporation module 5 refrigerant outlet and injector 26 refrigerant outlet are connected with absorption module 6 refrigerant inlet, the outlet of absorption module 6 cold-producing medium mother solution is connected through the entrance of control valve 22 with the first regenerator 7 cold-producing medium mother solution, first regenerator 7 cold-producing medium mother solution outlet is connected with high-temperature generator 1 cold-producing medium mother solution entrance, the outlet of high-temperature generator 1 cold-producing medium barren solution is connected with the first regenerator 7 cold-producing medium barren solution entrance, first regenerator 7 cold-producing medium barren solution exports the first solution pump 10 entrance and is connected, first solution pump 10 outlet is connected with absorption module 6 cold-producing medium barren solution entrance, absorb the outlet of evaporation module 5 cold-producing medium mother solution to be connected with the second solution pump 9 entrance, second solution pump 9 exports and is connected with the second regenerator 8 cold-producing medium mother solution entrance, second regenerator 8 cold-producing medium mother solution outlet is connected with low temperature generation module 2 cold-producing medium mother solution entrance, the outlet of low temperature generation module 2 cold-producing medium barren solution is connected with the second regenerator 8 cold-producing medium barren solution entrance, and the second regenerator 8 cold-producing medium barren solution outlet is evaporated module 5 cold-producing medium barren solution entrance through control valve 18 with absorption and is connected.
Described low temperature generation module 2 refrigerant outlet is connected with injector 26 refrigerant inlet respectively with evaporimeter 4 refrigerant outlet V, and injector 26 refrigerant outlet evaporates module 5 refrigerant outlet with absorption and is connected.
Above-mentioned mention low temperature generation module 2, condensation module 3, absorb evaporation module 5, absorption module 6 and refrigerant charge working medium to identical with the described content in embodiment 1 or embodiment 2.
The present embodiment is with natural refrigerant CO 2for cold-producing medium, [bmim] [PF 6] for absorbent is illustrated, its idiographic flow is summarized as follows:
Cold-producing medium rich solution (is rich in CO 2[bmim] [PF 6] mixed solution) in high-temperature generator 1, heated (temperature range is at 280 DEG C-300 DEG C) be vaporizated into high pressure superheater state refrigerant vapour, entering condenser 13 medium condenses that is cooled as working gas becomes refrigerant liquid to be divided into two-way, the cold-producing medium of one tunnel after choke valve 14 step-down cooling evenly sprays in evaporimeter 4 evaporation endothermic at a lower temperature through spray thrower, then gaseous refrigerant bifurcation, an ejection gas as injector 26, another enters through control valve 27 and absorbs evaporimeter 15 by the cold-producing medium lean solution from cryogenerator 11 (containing a small amount of CO 2[bmim] [PF 6] mixed solution) absorb, then cold-producing medium rich solution is pumped in cryogenerator 11 by the second solution pump 9 and is heated (temperature range is at 180 DEG C-220 DEG C) and be vaporized into higher pressure higher temperature refrigerant vapour, the low pressure refrigerant that injector 26 injection carrys out flash-pot 4 is entered as working gas, after injector 26 mixes supercharging, the gases at high pressure that injector 26 exports are mixed in absorber 19 with the low pressure refrigerant vapor carrying out self-absorption evaporimeter 15 and are absorbed heat release under elevated pressure conditions by the cold-producing medium lean solution from high-temperature generator 1 under elevated pressure conditions, the heat medium that is cooled is taken away, become cold-producing medium rich solution and pumped into high-temperature generator 1 by the first solution pump 10, repeat above-mentioned circulation.
The above-mentioned generator, absorber, condenser, evaporimeter, the first regenerator, the second regenerator, absorption evaporimeter etc. mentioned is heat exchanger, and dropping equipment, solution pump are identical with the performance in embodiment 1 with control valve.

Claims (3)

1. low-grade energy drives CO 2absorption system, comprise: high-temperature generator (1), condensation module (3), evaporimeter (4), absorption module (6), first solution pump (10), first regenerator (7), refrigerant charge working medium pair, it is characterized in that, also comprise low temperature generation module (2), absorb evaporation module (5), second regenerator (8), second solution pump (9), high-temperature generator (1) refrigerant outlet is connected with the entrance of condensation module (3) respectively with low temperature generation module (2) refrigerant outlet, condensation module (3) cold-producing medium first exports (I) and is connected with evaporimeter (4) refrigerant inlet, evaporimeter (4) refrigerant outlet evaporates module (5) refrigerant inlet with absorption and is connected, condensation module (3) cold-producing medium second exports (II) and evaporates module (5) refrigerant inlet be connected with absorption, absorb evaporation module (5) refrigerant outlet to be connected with absorption module (6) refrigerant inlet, low temperature generation module (2) cold-producing medium second exports (II) and absorbs evaporation module (5) refrigerant outlet and is connected with absorption module (6) refrigerant inlet, condensation module (3) cold-producing medium second exports (II) and is connected with energy recovering heat exchanger (25) refrigerant inlet, and energy recovering heat exchanger (25) refrigerant outlet evaporates module (5) refrigerant inlet with absorption and is connected,
Described low temperature generation module (2) has cryogenerator (11) and control valve (12), and cryogenerator (11) refrigerant outlet is connected with control valve (12) entrance; Condensation module (3) has condenser (13) and dropping equipment (14), and condenser (13) refrigerant outlet is connected with dropping equipment (14) entrance; Absorb evaporation module (5) and there is absorption evaporimeter (15), control valve (16), cryogenic fluid storage tank (17), absorb the outlet of evaporimeter (15) cold-producing medium mother solution and be connected with cryogenic fluid fluid reservoir (17) entrance through control valve (16); Absorption module (6) has absorber (19), pyrosol storage tank (20), control valve (21), and the outlet of absorber (19) cold-producing medium mother solution is connected with pyrosol storage tank (20) entrance through control valve (21); Wherein,
The CO that described low-grade energy drives 2the operation principle of absorption system is the supercritical CO of effusion from high-temperature generator (1) 2gases at high pressure, are condensed into gas-fluid two-phase mixture in condenser (13), and after reducing pressure by regulating flow, cooling, a point two-way leaves;
The CO of one road low-temp low-pressure 2liquid evenly to spray in evaporimeter (4) and at this evaporation endothermic through spray thrower, CO 2gas is absorbed by the weak solution from cryogenerator (11) in absorption evaporimeter (15), releases heat, becomes and be rich in CO 2[emim] [Tf2N] mix concentrated solution and pump into cryogenerator (11) through the second solution pump (9) and the second regenerator (8), become weak solution produce higher temperature refrigerant gas under the effect of low-grade Low Temperature Thermal after, carry out the circulation of cryogenic refrigeration of lower cycle unit;
The CO of another road low-temp low-pressure 2liquid, in absorption evaporimeter (15), becomes the CO of higher temperature after absorbing the former liberated heat 2gas directly enter absorber (19) or with the high temperature CO from cryogenerator (11) 2absorber (19) is entered after gas blending, and absorbed by the cold-producing medium lean solution from high-temperature generator (1) in absorber (19), cold-producing medium rich solution is become after releasing heat, pump into high-temperature generator (1) through the first solution pump (10) and the first regenerator (7), under the effect of low-grade high-temperature hot, produce high temperature CO 2gas becomes weak solution, carries out the high-temperature refrigeration unit circulation of lower cycle.
2. low-grade energy drives CO 2absorption system, comprise: high-temperature generator (1), condensation module (3), evaporimeter (4), absorption module (6), first regenerator (7), first solution pump (10), refrigerant charge working medium pair, it is characterized in that, also comprise low temperature generation module (2), second regenerator (8), second solution pump (9), absorb evaporation module (5), condensation module (3) cold-producing medium second exports (II) and evaporates module (5) refrigerant inlet be connected with absorption, evaporimeter (4) refrigerant outlet (VI) evaporates module (5) refrigerant inlet with absorption and is connected, low temperature generation module (2) refrigerant outlet and evaporimeter (4) refrigerant outlet (V) are connected with injector (26) entrance respectively, absorb evaporation module (5) refrigerant outlet to be connected with absorption module (6) refrigerant inlet, low temperature generation module (2) cold-producing medium second exports (II) and absorbs evaporation module (5) refrigerant outlet and is connected with absorption module (6) refrigerant inlet, condensation module (3) cold-producing medium second exports (II) and is connected with energy recovering heat exchanger (25) refrigerant inlet, and energy recovering heat exchanger (25) refrigerant outlet evaporates module (5) refrigerant inlet with absorption and is connected,
Described low temperature generation module (2) has cryogenerator (11) and control valve (12), and cryogenerator (11) refrigerant outlet is connected with control valve (12) entrance; Condensation module (3) has condenser (13) and dropping equipment (14), and condenser (13) refrigerant outlet is connected with dropping equipment (14) entrance; Absorb evaporation module (5) and there is absorption evaporimeter (15), control valve (16), cryogenic fluid storage tank (17), absorb the outlet of evaporimeter (15) cold-producing medium mother solution and be connected with cryogenic fluid fluid reservoir (17) entrance through control valve (16); Absorption module (6) has absorber (19), pyrosol storage tank (20), control valve (21), and the outlet of absorber (19) cold-producing medium mother solution is connected with pyrosol storage tank (20) entrance through control valve (21); Wherein,
Cold-producing medium rich solution in high-temperature generator (1) by heat vaporized be high pressure superheater state refrigerant vapour, entering the cooled medium condenses of condenser (13) as working gas becomes refrigerant liquid to be divided into two-way, the cold-producing medium of one tunnel after choke valve (14) step-down cooling evenly sprays in evaporimeter (4) evaporation endothermic at a lower temperature through spray thrower, then gaseous refrigerant bifurcation, an ejection gas as injector (26), another enters absorption evaporimeter (15) through control valve (27) and is absorbed by the cold-producing medium lean solution from cryogenerator (11), then cold-producing medium rich solution is pumped in cryogenerator (11) by heat vaporized one-tenth higher pressure higher temperature refrigerant vapour by the second solution pump (9), the low pressure refrigerant that injector (26) injection comes flash-pot (4) is entered as working gas, after injector (26) mixing supercharging, the gases at high pressure that injector (26) exports are mixed in absorber (19) with the low pressure refrigerant vapor carrying out self-absorption evaporimeter (15) and are absorbed heat release under elevated pressure conditions by the cold-producing medium lean solution from high-temperature generator (1) under elevated pressure conditions, the heat medium that is cooled is taken away, become cold-producing medium rich solution and pumped into high-temperature generator (1) by the first solution pump (10), repetitive cycling.
3. low-grade energy according to claim 1 drives CO 2absorption system, is characterized in that, refrigerant charge working medium is to employing natural refrigerant CO 2for cold-producing medium, ionic liquid, NHD, amine liquid or mixed amine liquid are absorbent.
CN201210289216.5A 2012-08-08 2012-08-08 Low-grade-energy drive CO2 absorption refrigeration system Expired - Fee Related CN102798247B (en)

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CN105066508B (en) * 2015-07-31 2017-08-25 内蒙古科技大学 A kind of efficient injection absorption refrigerating machine for freezing and refrigeration
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