Static magnetic field assisted liquefied CO2 pulse spouting quick freezing device and pressurized efficient freezing method

A technology of pulse jetting and quick-freezing device, which is used in food freezing, household refrigeration devices, cooling fluid circulation devices, etc. It is difficult to obtain guarantees and other problems to achieve the effects of rapid freezing and uniform internal and external, uniform freezing and magnetic field assistance, and maintenance of physical and chemical and nutritional indicators.

Pending Publication Date: 2022-06-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the liquid carbon dioxide food quick-freezing technology disclosed in ZL201910271687.5 and ZL201911029464.4 above, it can be clearly known that the current liquid carbon dioxide spray is sprayed from above towards the material, based on the principle of liquid carbon dioxide quick-freezing, the material accumulation thickness There must be some restrictions, otherwise it is difficult to guarantee the freezing quality of the material. The reason is that for materials with a certain accumulation thickness, the materials at the bottom cannot be covered and penetrated by the spray liquid as quickly as the materials at the upper layer. Therefore, in the same During the freezing

Method used

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  • Static magnetic field assisted liquefied CO2 pulse spouting quick freezing device and pressurized efficient freezing method
  • Static magnetic field assisted liquefied CO2 pulse spouting quick freezing device and pressurized efficient freezing method
  • Static magnetic field assisted liquefied CO2 pulse spouting quick freezing device and pressurized efficient freezing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1: Cantaloupe

[0069] (1) Raw material pretreatment

[0070] a. Raw material screening and cleaning: select cantaloupe melons with uniform size, moderate maturity, and no mechanical damage, and then clean them;

[0071] b. Slicing: Slice the cleaned cantaloupe along the central equator, and then use a self-made punch to punch out a cylindrical cantaloupe sample with a diameter of 2.5 cm and a height of 3 cm.

[0072] (2) Raw material pre-cooling and CO 2 pre-pressurized

[0073] Put the cantaloupe block into the grid sample tray, then put it in the freezer, insert the precision thermocouple into the center of the cantaloupe block sample of different layers, measure the temperature change of the center, close the airtight hatch and the exhaust port. Turn on the vacuum pump to draw out the air in the freezer and turn off the vacuum pump. Open the flow regulating valve, adjust the flow to low speed, and input liquefied CO 2 to the freezer until the temperatur...

Embodiment 2

[0085] Example 2: Summer Black Grapes

[0086] (1) Raw material pretreatment

[0087] Select the fruits of summer black grapes with uniform size, moderate maturity, and no mechanical damage, pick the fruit, clean it, and drain the water.

[0088] (2) Raw material pre-cooling and CO 2 pre-pressurized

[0089] Put the grape fruit into the tray, and then put it in the freezing device, and insert the precision thermocouple in the device into the center of the grape samples in different layers, measure the temperature change of the center, and close the sealed hatch and exhaust port. Turn on the vacuum pump to draw out the air in the freezer and turn off the vacuum pump. Turn on liquefied CO 2 valve, adjust the flow valve to low speed, input liquefied CO 2 to a freezer temperature of 4°C. At the same time, the internal pressure was adjusted to 1MPa, and the pressurized state was maintained for 20min.

[0090] (3) Static magnetic field assisted liquefaction of CO 2 Pulse jet...

Embodiment 3

[0102] Example 3: Carrots

[0103] (1) Raw material pretreatment

[0104] a. Raw material screening and cleaning: select carrots with uniform size, moderate maturity and no mechanical damage, and then clean them;

[0105] b. Slicing: Use a self-made punch to punch out a cylinder with a diameter of 2.5 cm from the cleaned carrots, and then cut into samples with a thickness of 1 cm.

[0106] (3) Raw material pre-cooling and CO 2 pre-pressurized

[0107] Put the carrot slices into the tray, and then put them in the freezing device, insert the precision thermocouple in the device into the center of the carrot samples in different layers, measure the temperature change of the center, and close the airtight hatch and exhaust port. Turn on the vacuum pump to draw out the air in the freezer and turn off the vacuum pump. Turn on liquefied CO 2 valve, adjust the flow valve to low speed, input liquefied CO 2 to a freezer temperature of 4°C. At the same time, the internal pressure ...

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Abstract

The invention discloses a static magnetic field assisted liquefied CO2 pulse spouting quick freezing device and a pressurized efficient freezing method, and belongs to the technical field of freezing processing. The quick-freezing device comprises a freezing chamber, a liquid CO2 spraying device, a static magnetic field generating device, a pulse spouting device, a temperature collecting device and a controller, liquefied CO2 is adopted as a freezing medium, the pulse spouting device is matched to enable thick stacked materials to be frozen evenly and quickly, the static magnetic field generating device is matched to assist in freezing, and the size of ice crystals can be reduced. The freezing method comprises the steps of evacuation, precooling, CO2 pressurization, magnetic field-assisted quick freezing and deep freezing. According to the method, CO2 pressurization pretreatment and pulse spouting are combined, the freezing time is remarkably shortened, the ice nucleation process is regulated and controlled, and freezing is uniform. Compared with industrial air blast quick-freezing, the time for the frozen materials to pass through the maximum ice crystal generation zone is shortened by more than 20%, and the ice crystal size of the product is reduced by more than 20%. The juice loss rate of the unfrozen product is reduced by more than 4%.

Description

technical field [0001] The invention relates to the category of freezing processing technology in the technical field of food processing, in particular to a static magnetic field assisted liquefaction CO 2 A pulse jet quick-freezing device and a pressurized high-efficiency freezing method. Background technique [0002] Today, freezing has become an important means of food processing and preservation, especially for long-term storage and transportation, and is considered an ideal choice. Studies have shown that freezing is particularly harmful to food when the freezing speed is slow, because the water molecules gradually migrate to the nuclei and the ice crystals continue to grow. The mechanical damage of ice crystals to frozen food is one of the main reasons for the deterioration of product quality. On the other hand, slow freezing has a concentration effect. During freezing, liquid water gradually turns into solid ice, and the free water content decreases, resulting in a...

Claims

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Application Information

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IPC IPC(8): F25D11/00F25D17/02F25D19/04F25D23/00F25D23/06F25D25/02F25D29/00A23B7/015A23B7/055A23L3/015A23L3/26A23L3/375
CPCF25D11/00F25D17/02F25D19/04F25D23/006F25D23/065F25D25/021F25D29/001F25D29/005A23L3/375A23L3/26A23L3/0155A23B7/055A23B7/015A23V2002/00F25D2700/16F25D2700/12A23V2300/20
Inventor 张慜姜齐永范东翠
Owner JIANGNAN UNIV
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