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Freezing and blocking methods adopting gas as cooling medium

A freezing method and refrigerant technology, applied in coolers, refrigerators, household refrigeration devices, etc., can solve the problems of infiltration, change of food flavor, difficulty in separation, etc., and achieve the effect of reducing the temperature difference

Inactive Publication Date: 2016-08-10
黄翔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The direct immersion and freezing treatment of food is essentially a process of heat and mass transfer. On the one hand, it is inevitable that part of the brine will enter the food during the immersion process, and these liquid brines will be difficult to volatilize. Long-term residues in the food (although the refrigerant like alcohol is volatile, it will change the flavor of the food), which may cause the flavor of the frozen food to change or even exceed the standard of food additives; Indirect immersion freezing is used for packaging. In the actual operation process, it is inevitable that the packaging will be damaged and seep into the food. At the same time, it will also increase the cost of freezing. This is one of them;
[0008] On the other hand, in the process of immersion, it is inevitable that some substances in the food will infiltrate into the brine, and many impurities are dissolved in the brine and it is difficult to separate. Decreased quality, resulting in low recovery rate of brine, greatly increasing refrigeration costs
[0009] In addition, these existing refrigerants contain salts to varying degrees, and high-concentration salts are easy to corrode equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, liquefied carbon dioxide is used as the brine for immersion freezing. The set immersion temperature of the brine is -50°C, and the temperature of the freezing stage of the product to be frozen is -18°C. Including the following steps:

[0039] Step 1: Pre-cool the liquefied carbon dioxide to -50°C;

[0040] Step 2: Pass the pre-cooled liquefied carbon dioxide into the freezing tank, and immerse the product to be frozen in the liquefied carbon dioxide until the center temperature of the product to be frozen reaches -18°C, and conduct a temperature-controlled cycle on the liquefied carbon dioxide during the freezing process Refrigeration keeps the temperature of liquefied carbon dioxide at -50°C (in actual operation, the actual temperature may have a certain deviation due to factors such as refrigeration equipment, and usually the deviation temperature is within ±5°C, which belongs to the normal error category) And during the freezing process, a workin...

Embodiment 2

[0044] In this embodiment, supercritical air is used as the brine for immersion freezing. The immersion temperature of the brine is set at -65°C, and the temperature of the freezing stage of the product to be frozen is -60°C. Including the following steps:

[0045] Step 1: Pre-cool supercritical air to -65°C;

[0046] Step 2: Pass the pre-cooled supercritical air into the freezing tank, and immerse the product to be frozen in the supercritical air until the central temperature of the product to be frozen reaches -60 ° C. During the freezing process, the supercritical air is The temperature-controlled cycle refrigeration keeps the temperature of the supercritical air at -65°C (in actual operation, due to the constraints of refrigeration equipment and other factors, there may be a certain deviation in the actual temperature, and usually the deviation temperature is within ±5°C, which is normal The range of error) and continuously apply 5.2MPa working pressure to the supercritic...

Embodiment 3

[0049] In this embodiment, supercritical nitrogen is used as the brine for immersion freezing. The set immersion temperature of the brine is -60°C, and the temperature of the freezing stage of the product to be frozen is -55°C. Including the following steps:

[0050] Step 1: Precool supercritical nitrogen to -60°C;

[0051] Step 2: Pass the pre-cooled supercritical nitrogen into the freezing tank, and immerse the product to be frozen in the supercritical nitrogen until the central temperature of the product to be frozen reaches -55 ° C. During the freezing process, the supercritical nitrogen is The temperature-controlled cycle refrigeration keeps the temperature of supercritical nitrogen at -60°C (in actual operation, due to the constraints of refrigeration equipment and other factors, there may be a certain deviation in the actual temperature, and usually the deviation temperature is within ±5°C, which is normal The range of error) and continuously apply 3.5MPa working press...

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PUM

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Abstract

The invention relates to the technical field of freezing and refrigeration, particularly to freezing and blocking methods adopting gas as a cooling medium. The freezing method comprises the following steps: 1, taking colorless, odorless and nontoxic liquid gas or supercritical gas as a freezing cooling medium; 2, dipping a product to be frozen into the liquid gas or supercritical gas until the center temperature of the product to be frozen reaches the temperature of a freezing stage; 3, taking out the product to be frozen, and transferring the product to a low-temperature refrigeration environment for storage. The blocking method comprises the following steps: 1, dividing a freezing process of the product to be frozen into at least two freezing stages; 2, conducting freezing operations corresponding to the freezing stages on the product to be frozen in sequence; 3, after the pressure of the product to be frozen and the atmospheric pressure are balanced, transferring the product to be frozen into the low-temperature refrigeration environment for storage. According to the freezing and blocking methods, after dipping and freezing are performed, the cooling medium cannot be left in food, and the flavor of the food cannot be changed; meanwhile, the original quality of the cooling medium can be maintained.

Description

technical field [0001] The invention relates to the technical field of freezing and refrigeration, in particular to a freezing and segmenting method using gas as a refrigerant. Background technique [0002] Immersion freezing refers to the method of using a refrigerator to cool down the freezing liquid, and immersing food in the freezing liquid for freezing. The freezing liquid is also called a refrigerant. Immersion freezing technology is a high-efficiency freezing method, which has many advantages that other freezing methods do not have. It has at least the following significant advantages: [0003] First, the freezing speed is fast. The thermal conductivity of air at normal temperature is 0.024W / (m k), while the thermal conductivity of most liquids is 0.116-0.628W / (m k), which is 5-26 times that of the air medium. The freezing medium is air at normal pressure, and the freezing medium of the immersion freezing is the freezing liquid, that is, the refrigerant. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L3/375F25D3/10
CPCA23L3/375F25D3/10F25D13/065
Inventor 黄翔黄雨诗
Owner 黄翔