Open air-cooled low-temperature refrigeration house for recovering cold energy of liquefied natural gas

Abstract

The invention discloses an open air-cooled low-temperature refrigeration house for recovering the cold energy of the liquefied natural gas. The refrigeration house comprises a cold air treatment box positioned at one side of the refrigeration house, and the cold air treatment box is connected with the upper part of the refrigeration house through an air supply pipe and is connected with the lowerpart of the refrigeration house through an air return pipe; a heat exchanger is arranged at the bottom of the cold air treatment box and is connected with an outlet of the liquefied natural gas circulation through a liquefied natural gas pump, and a fan is installed above the heat exchanger and is located below an air inlet of the air supply pipe. According to the present invention, the cold energy of the liquefied natural gas is fully recycled, the open air supplies cold to a cold chamber, the heat exchanger is not needed in the cold chamber, the frosting is avoided, the system equipment is simple, the initial investment and the energy consumption are low, the utilization rate of the cold energy of the liquefied natural gas is increased, and the energy conservation and the environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of food freezing and refrigeration, in particular to an open air refrigeration low-temperature cold storage for recovering the cold energy of liquefied natural gas. Background technique [0002] The usual low-temperature cold storage for food freezing and refrigeration is a Freon or ammonia two-stage compression refrigeration system, and a cascade refrigeration system is also used. The refrigeration compressor consumes a lot of electric energy, and the inner coil of the cold storage room or the surface of the air cooler is frosted. , resulting in an increase in heat transfer resistance, a decrease in heat transfer performance, a decrease in evaporation temperature, and a further increase in the power consumption of the refrigeration compressor. At the same time, the refrigeration system is complex and the initial investment is high. If the brine is used to recover the cold energy of liquefied natural gas, si...

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Problems solved by technology

[0002] The usual low-temperature cold storage for food freezing and refrigeration is a Freon or ammonia two-stage compression refrigeration system, and a cascade refrigeration system is also used. The refrigeration compressor consumes a lot of electric energy, and the inner coil of the cold storage room or the surface of the air cooler is frosted. , resulting in increased heat transfer resistance, reduced heat transfer performance, reduced evaporation temperature, and further increased power consumption of the refrigeration compressor. At the same time, the refrigeration system is complex and the initial investment is high

If the brine is used to recover the cold energy of liquefied natural gas, similarly, frost will form on the surface of the coil or air cooler in the cold room of the cold storage, which will affect the heat transfer effect, and the defrosting will affect the temperature field in the cold room and affect the freshness of food. The quality, the cleaning of defrosting water is also more troublesome

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