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Cryogenic stage mixed refrigerant suitable in two-stage cascade refrigeration system

A technology of mixed refrigerant and cascade refrigeration, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as the failure of the system to work normally, and achieve the effects of good mutual solubility, increased refrigeration capacity, and enhanced mutual solubility.

Active Publication Date: 2008-10-15
青岛中科未来健康研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to CO 2 Has a very high triple point temperature (-56.6°C), so the above-mentioned CO 2 The mixture used at low temperature is very easy to cause the system to fail to work properly due to the solid phase precipitation of carbon dioxide

Method used

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  • Cryogenic stage mixed refrigerant suitable in two-stage cascade refrigeration system
  • Cryogenic stage mixed refrigerant suitable in two-stage cascade refrigeration system
  • Cryogenic stage mixed refrigerant suitable in two-stage cascade refrigeration system

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: ethane with a molar concentration of 50% and fluoromethane with a molar concentration of 50% are physically mixed at room temperature to obtain a low-temperature-grade mixed refrigerant applicable to a two-stage cascade refrigeration system.

Embodiment 2

[0022] Example 2: ethane with a molar concentration of 55% and fluoromethane with a molar concentration of 45% are physically mixed at room temperature to obtain a low-temperature-grade mixed refrigerant applicable to a two-stage cascade refrigeration system.

Embodiment 3

[0023] Example 3: ethane with a molar concentration of 60% and fluoromethane with a molar concentration of 40% are physically mixed at room temperature to obtain a low-temperature-grade mixed refrigerant applicable to a two-stage cascade refrigeration system.

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Abstract

The invention relates to low temperature stage mixed refrigerant applicable to two-stage cascade refrigeration systems. The mixed refrigerant comprises ethane and monofluoro-methane, and is formed through physical mixture, wherein the molarity of ethane is 50 to 75 percent, and the balance is monofluoro-methane. The mixed refrigerant can also comprises ethane, monofluoro-methane and perfluoroethane, and is formed through physical mixture, wherein the molarity of ethane is 40 to 70 percent; the molarity of monofluoro-methane is 5 to 40 percent; the balance is perfluoroethane. The mixed refrigerant has high efficiency and high evaporation pressure, as well as good refrigeration capacity under the same compressor displacement, has zero ODP, greatly decreases GWP than R503 and R508B, and has good intersolubility with lubricating oil.

Description

technical field [0001] The invention relates to a mixed refrigerant, in particular to a mixed refrigerant suitable for a low-temperature stage in a two-stage cascade refrigeration system. Background technique [0002] Now the industry still generally adopts a two-stage cascade refrigeration cycle to achieve a refrigeration temperature of about -80°C. The basic principle of cascade refrigeration is to use a high temperature stage refrigeration system to cool a low temperature stage system to achieve a lower refrigeration temperature, where each stage is a complete vapor compression cycle. Generally speaking, the evaporation temperature of the high-temperature stage refrigeration system is generally between -30°C and -40°C, while the low-temperature stage generally works between -60°C and -80°C. [0003] The low-temperature grade refrigerants in the traditional cascade refrigeration system that can be applied to the -80°C temperature range include trifluorochloromethane (CClF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/04
Inventor 公茂琼张宇吴剑峰
Owner 青岛中科未来健康研究院有限公司
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