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Trans-critical carbon dioxide refrigeration method and device thereof

A carbon dioxide and refrigeration method technology, which is applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of low refrigeration energy efficiency and small refrigeration capacity, and achieve the goal of increasing internal volume, large cooling range, and odorless latent heat of evaporation Effect

Pending Publication Date: 2020-02-18
SHANGHAI FULUDI FLUID TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, in view of the common defects of low refrigeration energy efficiency and small refrigeration capacity in the prior art WO2004072567 A2, CN105371516 A and CN106196685 A, it is very necessary to develop a refrigeration method that is environmentally friendly and has high refrigeration cycle efficiency

Method used

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  • Trans-critical carbon dioxide refrigeration method and device thereof
  • Trans-critical carbon dioxide refrigeration method and device thereof
  • Trans-critical carbon dioxide refrigeration method and device thereof

Examples

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Embodiment 1

[0045] see figure 1 As shown, the present embodiment provides a transcritical carbon dioxide refrigeration method, which specifically includes the following steps:

[0046] (1) After the superheated carbon dioxide vapor flowing through the low-pressure side of the internal regenerator is pressurized by the first compressor 1 to perform a compression treatment, the first gas cooler 2 is used to perform a cooling treatment; specifically, the low-pressure superheated carbon dioxide vapor is The first compressor 1 is compressed to a subcritical state (temperature T 1 , pressure P 1 ), then enter the first gas cooler 1 and be cooled by the cooling medium (temperature T 2 );

[0047] (2) After the subcritical carbon dioxide that enters the first gas cooler 1 for primary cooling is pressurized by the second compressor 2 for secondary compression, the second gas cooler 4 is used for secondary cooling; CO after cooler 2 2 The gas is compressed to a supercritical state (temperature...

Embodiment 2

[0058] see figure 1 As shown, this embodiment provides a transcritical carbon dioxide refrigeration device based on the refrigeration method described in Embodiment 1 above, including a first compressor 1, a first gas cooler 2, a second compressor 3, and a second gas cooler 4. Internal regenerator 5, expander 6, evaporation tank 9 and liquid storage tank 10.

[0059] Such as figure 1 As shown, the low-pressure side of the internal regenerator 5 is connected to the first gas cooler 2 through the first compressor 1 through a pipeline, which is used to transfer the superheated carbon dioxide flowing through the low-pressure side of the internal regenerator 5 Steam is initially compressed into subcritical carbon dioxide, and the temperature is initially lowered by the first gas cooler 2; the first gas cooler 2 is connected to the second compressor 3 and the second gas cooler 4 through pipelines The high-pressure side of the internal regenerator 5 is used for secondary compressio...

Embodiment 3

[0066] see figure 2 As shown, this example provides another method for transcritical CO 2 Refrigeration control device, which is used for transcritical CO 2 The cooling control device adds temperature sensors 12, 14, 16, 19, 20, 24, 28 and pressure sensors 12, 15, 23, 29 on the basis of the cooling device described in the above-mentioned embodiment 2; The first filter 18, the second filter 22, the first stop valve 25, the second stop valve 27, the first safety valve 21, the second safety valve 30, the system leak detection device 31 and the first gas cooler 2 and the cooling fan 13,17,26 on the second gas cooler 4 and the evaporator 9.

[0067] In this example, if figure 2 As shown, temperature sensors 12, 14, 16, 19, 20, 24, 28 and pressure sensors 12, 15, 23, 29 are used to collect the temperature and pressure values ​​of each part, and the control system judges and controls the operation status of each part of the device. The refrigeration circuit cut-off valve group ...

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Abstract

The invention discloses a trans-critical carbon dioxide refrigeration method and a device thereof. The method comprises the following steps that (1) superheated carbon dioxide steam is pressurized forprimary compression and primary cooling; (2) subcritical carbon dioxide is subjected to secondary compression and secondary cooling; (3) after supercritical carbon dioxide is cooled again, the supercritical carbon dioxide is throttled to be low-temperature subcritical carbon dioxide; (4) the throttled low-temperature subcritical carbon dioxide is sent to an evaporation tank to be evaporated intohigh-temperature low-pressure carbon dioxide gas; and (5) the high-temperature low-pressure carbon dioxide gas absorbs heat and then is converted into superheated carbon dioxide steam, and is fed intoa first compressor for boosting for cyclic utilization. According to the trans-critical carbon dioxide refrigeration method and the device thereof, an expansion machine is used for recycling and outputting mechanical energy to drive a compressor to complete compression, a double-compressor is used for improving the compression performance of the supercritical carbon dioxide, and a double-gas cooler and an internal regenerator are used for cooling the carbon dioxide gas so as to improve the cycle energy efficiency of the carbon dioxide.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a transcritical carbon dioxide refrigeration method and a device thereof. Background technique [0002] Existing refrigerants have adverse effects on the environment, mainly in the destruction of the ozone layer and the greenhouse effect. The destruction of the ozone layer and the greenhouse effect are manifested in the continuous reduction of ozone content and the continuous increase of greenhouse gas concentration, which will have a huge impact on the environment in which humans live, and even have serious consequences. while CO 2 As a natural refrigerant is a safe choice, in the field of refrigeration technology, due to CO 2 It is considered to be the most potential long-term substitute for CFCs, HCFCs and HFCs. Due to the natural working substance CO 2 With its good environmental protection characteristics, excellent heat transfer characteristics and considerable co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/00F25B9/06F25B40/06F25B43/02F25B49/02
CPCF25B9/008F25B9/06F25B40/06F25B43/02F25B49/02F25B2500/28
Inventor 杨景峰
Owner SHANGHAI FULUDI FLUID TECH CO LTD
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