Technological system and technological method for performing cryogenic quick freezing on seafoods by air

Abstract

The invention provides a technological system and a technological method for performing cryogenic quick freezing on seafoods by air. The technological system comprises an air compressor, an adsorptionsystem, a switch valve, a throttling valve, an expansion turbine, a cooler, a cryogenic heat exchanger, a gas-liquid separator, a storing tank, a seafood cryogenic quick freezing box and a heater, wherein the technological method comprises the following steps of compressing the air; then removing impurities including moisture, carbon dioxide and the like in the air, and finally compressing and cooling the air to obtain liquid air to perform cryogenic quick freezing on the seafoods. According to the technological system and the technological method disclosed by the invention, air is used to replace liquid nitrogen, so that the cryogenic quick freezing cost of the seafoods is reduced, and the situation that lives are damaged and properties are damaged caused by leakage of the liquid nitrogen is avoided.

Description

technical field [0001] The invention relates to a method for deep-cooling and quick-freezing seafood by using air, in particular to a method for compressing and cooling air, purifying it, and liquefying it at low temperature into liquid, and then performing deep-freezing and quick-freezing seafood, which belongs to the technical field of seafood processing. Background technique [0002] At present, liquid nitrogen is generally used for deep freezing and quick freezing of seafood. Liquid nitrogen is liquid nitrogen with a liquid temperature of -196°C under normal pressure. It is inert, colorless, odorless, non-corrosive, and non-flammable. In industry, liquid nitrogen generally comes from the air separation unit of the steel plant and coal chemical plant. The air separation unit is not only complex in system and high in investment, but also generally located in remote chemical industry parks. Seafood is generally required to be processed near the coast to maintain the quali...

AI Technical Summary

Problems solved by technology

Liquid nitrogen is transported and distributed by tank trucks for long distances, and the evaporation loss of nitrogen is large, which leads to an increase in the purchase cost of liquid nitrogen; the low-temperature gas after use of liquid nitrogen cannot be recycled and directly emptied, resulting in loss of cooling capacity and waste of resources, thus As a result, the cost of deep freezing and quick freezing of seafood using liquid nitrogen remains high

At the same time, the use of liquid nitrogen requires downstream users to configure independent liquid nitrogen storage tanks for storage. During the transportation and storage of liquid nitrogen, if leakage occurs, it is easy to cause a local anoxic suffocation environment, which will cause great harm to life and property.

[0003] The publication date is October 6, 2004, and the publication number is CN1533717A Chinese patent, which discloses a method for food processing using liquid nitrogen. The food can be frozen instantly, and then the gasified nitrogen gas after freezing is passed into the box dryer, so that the fruits and vegetables can be dehydrated and dried under anaerobic conditions. This method can complete the freezing of food in an instant, and the process is simple. But the processing cost is high

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