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1. (WO2017198044) FREEZING AND MULTI-STAGE FREEZING METHOD USING GAS AS REFRIGERANT

Pub. No.:    WO/2017/198044    International Application No.:    PCT/CN2017/081788
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Wed Apr 26 01:59:59 CEST 2017
IPC: A23L 3/375
F25D 3/10
Applicants: HUANG, Xiang
黄翔
Inventors: HUANG, Xiang
黄翔
HUANG, Yushi
黄雨诗
Title: FREEZING AND MULTI-STAGE FREEZING METHOD USING GAS AS REFRIGERANT
Abstract:
A freezing method using a gas as a refrigerant, comprising: step 1: using a colorless, tasteless, and non-toxic liquid gas or supercritical gas as a refrigerant for freezing; step 2: immersing a product to be frozen in the liquid gas or the supercritical gas until the center temperature of the product to be frozen reaches the temperature of a freezing stage; and step 4: taking out the product to be frozen and transferring it to a frozen storage low temperature environment for storing. A multi-stage freezing method using a gas as a refrigerant, comprising: step 1: dividing the freezing process for a product to be frozen into at least two freezing stages; step 2: sequentially performing freezing operations corresponding to each of the freezing stages on the product to be frozen; and step 3: transferring, after balancing the pressure of the product to be frozen with the atmospheric pressure, the product to be frozen to the frozen storage low temperature environment for storing.