Using method of low temperature refrigerating machine in low temperature device

Abstract

The invention relates to a using method of a low temperature refrigerating machine in a low temperature device; the using method comprises the following steps: a working medium to be pre-cooled is pre-cooled to reach a specified low temperature; the lower temperature device comprises a plurality of low temperature refrigerating machines and a pre-cooling working medium heat exchanger, wherein the plurality of low temperature refrigerating machines are sequentially arranged from high to low according to the evaporating temperature of the lower temperature refrigerating machines; refrigerating fluid is pumped into each low temperature refrigerating machine; and the refrigerating fluid enters the pre-cooling working medium heat exchanger through the low temperature refrigerating machines to exchange heat with the working medium to be pre-cooled. According to the using method of the low temperature refrigerating machine in the low temperature device, the power consumption can be obviously reduced, and a required mature advanced product of the low temperature refrigerating machine also can be conveniently found. The using method can be applied to the process flow of various low temperature devices using the low temperature refrigerating machines and production devices.

Description

technical field [0001] The invention relates to a method for using a low-temperature refrigerator in a low-temperature device, which is applied to various technological processes and production devices of low-temperature devices using the low-temperature refrigerator. Background technique [0002] In the prior art, cryogenic refrigerators used in cryogenic devices have only one evaporating temperature, which is usually 3-5°C lower than the required precooling temperature of the working fluid to be precooled. The energy efficiency ratio of cryogenic refrigerators is different for different evaporation temperatures. For example, when the evaporation temperature is 6°C, the energy efficiency ratio (KW cooling capacity / KW shaft power) is about 4.5. When the evaporation temperature is -15°C, the energy efficiency ratio is about 2.3. When the evaporation temperature is -30°C, the energy efficiency ratio is about 1.6. However, when the evaporation temperature is -42°C, the energy...

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Problems solved by technology

And when the evaporation temperature is -42°C, the energy efficiency ratio is only about 1.0

[0003] The lower the evaporating temperature of the cryogenic freezer, the higher the value of the cooling capacity, but the more electricity will be consumed to obtain this cooling capacity, so it is uneconomical

On the other hand, with the enlargement of the equipment, when the evaporation temperature of the refrigerant is low (such as -42°C), there are few or no reliable high-power low-temperature refrigerators on the market, which brings great difficulties to supporting

[0004] At the same time, in some flammable and explosive low-temperature devices, such as natural gas liquefaction devices with pre-cooling, conventional low-temperature refrigerators with only one evaporation temperature can only be placed in explosion-proof environments, which will definitely increase its investment. , and is not conducive to the operation

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