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Absorption refrigerator by adopting CO2 as refrigerant

An absorption refrigerator and refrigerant technology, applied in the field of refrigerators in the field of refrigeration, can solve the problems of low efficiency, complex and large structure, etc., and achieve good application prospects, environmental friendliness, and compact structure.

Inactive Publication Date: 2010-06-02
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a CO 2 Absorption refrigerator as a refrigerant can effectively solve the technical defects of the existing technology such as complex structure and low efficiency

Method used

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  • Absorption refrigerator by adopting CO2 as refrigerant
  • Absorption refrigerator by adopting CO2 as refrigerant
  • Absorption refrigerator by adopting CO2 as refrigerant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 2 For the use of CO in the present invention 2 Be the structural representation of the embodiment 1 of the absorption refrigerating machine of refrigerant; As can be seen from the figure, the present invention adopts CO 2 Absorption chillers as refrigerants mainly include:

[0027] The absorber 1, the flow control valve 7, the generator 2, the condenser 3, the restrictor 6 and the evaporator 4 which are connected in sequence and form a refrigeration circuit, and the absorber 1 and the generator 2 which are connected Connect the liquid pump 5 on the pipeline, the inlet of the liquid pump 5 is connected with the absorber 1, and the outlet of the liquid pump 5 is connected with the generator 2; a flowing working medium circulates in the refrigeration circuit;

[0028] The flowing working medium includes absorbent and refrigerant; the refrigerant is CO 2 ; The absorbent is an ionic liquid, an alkaline solution or a mixed solution of the two.

[0029] The flowing...

Embodiment 2

[0031] image 3 For the present invention using CO 2 It is a structural schematic diagram of embodiment 2 of an absorption refrigerator for refrigerant; as can be seen from the figure, embodiment 2 is different from embodiment 1 by adding a regenerator 8, and its connection relationship is as follows image 3 As indicated by the arrows in , the refrigerant used is CO 2 , the absorbent ionic liquid is [EMIm]NTf 2 ; Absorber 1 contains CO at about 15°C 2 and [EMIm]NTf 2 The dilute solution is pressurized by the liquid pump 5 (the pressure is increased from 3MPa to 9MPa), heated by the counterflow regenerator 8, and enters the generator 2; the mixed solution in the generator 2 is heated by the heater 10, and the temperature rises to 400°C, due to temperature rise, CO 2 In [EMIm] NTf 2 Solubility decreases in CO, part of the CO 2 Separation from the mixed solution and become supercritical CO 2 High-pressure gas, CO2 gas exchanges heat with the dilute solution from the pump...

Embodiment 3

[0033] Figure 4 For the use of CO in the present invention 2 It is the structural representation of the embodiment 3 of the absorption refrigerating machine of refrigerant; As can be seen from the figure, the structure of embodiment 3 is basically the same as that of embodiment 2; because CO 2 The critical point temperature of the evaporator 4 is relatively low, if it is allowed to throttle and refrigerate at room temperature, it is difficult to produce a good cooling effect, so in this embodiment, the temperature and pressure from the evaporator 4 are still relatively low CO 2 The gas flows through the condenser 3, so that the high-pressure CO 2 The gas is cooled to below room temperature and then throttled and expanded, so that the CO 2 achieve better cooling effect. In this example, the refrigerant is CO 2 , the absorbent is alkaline solution N-methyldiethanolamine (CH3-N(CH 2 CH2OH) 2 ) solution; N-methyldiethanolamine (MDEA) and CO 2 The reaction generates unstabl...

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Abstract

The invention relates to an absorption refrigerator by adopting CO2 as a refrigerant, which comprises an absorber, a flow control valve, a generator, a condenser, a throttle, an evaporator and a liquid pump. The absorber, the flow control valve, the generator, the condenser, the throttle and the evaporator are connected with one another sequentially to form a refrigerating circuit; the liquid pump is communicated with the absorber and the generator; the flowing working medium in the refrigerating circuit comprises an absorbent and the CO2 refrigerant; and the absorbent is ionic liquid, alkaline solution or a mixture of the ionic liquid and the alkaline solution. The CO2 in the absorber and the absorbent enter the generator after being pressurized by the liquid pump, the temperature raises through heating, the CO2 is separated from the absorbent and enters the condenser, and the absorbent returns to the absorber again; the CO2 is condensed and cooled in the condenser, and is refrigerated under reduced pressure by the throttle so that the temperature is further reduced; the CO2 refrigerates the condensed medium in the evaporator; and at last the CO2 returns to the absorber again and is dissolved in the absorbent. The absorption refrigerator of the invention adopts the CO2 as the working medium, so the absorption refrigerator has the advantages of no toxicity, no explosivity, environmental friendliness and high refrigerating capacity per unit volume.

Description

technical field [0001] The invention relates to a refrigerator in the field of refrigeration, in particular to a refrigerator using CO 2 Refrigerant absorption chillers. technical background [0002] Absorption refrigeration is a refrigeration method that uses the difference in solubility of the refrigerant in the absorbent at different temperatures to realize the compression and expansion cycle of the refrigerant between high and low pressures, thereby obtaining a refrigeration effect. It mainly uses a heat source as a drive Force, only a small amount of mechanical compression work is required, so it has broad application prospects in refrigeration occasions where electric energy is scarce. The current absorption refrigeration mainly includes lithium bromide absorption refrigerators and ammonia absorption refrigerators, both of which have some shortcomings: lithium bromide refrigerators are negative pressure systems, and air leakage has a great impact on performance. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B15/02
CPCY02B30/62Y02A30/27
Inventor 罗二仓胡剑英戴巍吴张华余国瑶
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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