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Device used for assisting vacuum pre-cooling of rice

An auxiliary device and pre-cooling technology, applied in the direction of food ingredients as color, food science, etc., can solve the problems of uneven water distribution of rice, increase the risk of microbial contamination, secondary pollution, etc., to reduce secondary pollution, reduce time, The effect of reducing moisture loss

Active Publication Date: 2019-03-01
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the water spray vacuum precooling method mentioned above can make up for the loss of material moisture, it is difficult to ensure that the sprayed moisture can evenly cover the surface of each grain of rice, which often leads to uneven distribution of rice moisture, thereby affecting its quality.
At the same time, as rice is a starch-rich product, direct injection of water will not only reduce its quality, but also greatly increase the risk of microbial contamination (secondary pollution)

Method used

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  • Device used for assisting vacuum pre-cooling of rice
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  • Device used for assisting vacuum pre-cooling of rice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The auxiliary device group 7 involved in the present invention is used together with the vacuum precooling combination for precooling rice. Among them, the vacuum pre-cooler includes a condensation system, a vacuum system, a data collection system, and a data processing and operating system, which are connected in sequence, including a refrigeration unit 4, a condenser 14, a cryogenic liquid circulation pump 5, a vacuum box 1, a vacuum pump 2, Pneumatic valve 3, exhaust valve 6, drain valve 13, weight sensor 8, pressure sensor 9 and temperature sensor 10, data processor 15 and computer 16; the condensing system is composed of refrigeration unit 4, cryogenic liquid circulation pump 5 and condenser 14 The vacuum system consists of a vacuum box 1 and a vacuum pump 2; the data collection system consists of a weight sensor 8, a pressure sensor 9 and a temperature sensor 10; the data processing and operating system consists of a data processor 15 and a computer 16. Auxiliary ...

Embodiment 2

[0040] (1) Cook the mixture of rice and water (the mass ratio of rice and water is 1:1.5), by controlling the weight of the mixture and the size of the container, the height of the cooked rice is 200mm, and the cooking time is half an hour. The method is steam cooking, and the length and width distribution of rice is 1000mm.

[0041] (2) The auxiliary device group was first cleaned with tap water, and then placed in a cold storage at -18±2°C for treatment, taken out after 4 hours, then soaked in low-temperature alcohol with a mass fraction of 75% for 30 seconds for disinfection, and finally Rinse with tap water at 4±1°C for another 2 minutes.

[0042] (3) Wrap the cooked rice with sterilized gauze, then put it into the vacuum box of the vacuum pre-cooler, insert the temperature probe into the geometric center of the rice, close the vacuum box door of the vacuum pre-cooler, Turn on the vacuum pump and adjust the pressure drop rate coefficient of the vacuum pump to 0.2min -1 ,...

Embodiment 3

[0061] Embodiment 3 is the same as embodiment 1 method of operation, and the difference is that the parameters of the device itself are different. The device selected in embodiment 3 is different from the device in embodiment 1 in that the distribution of the hollow cylinder on the hollow cuboid, in embodiment 2 The selected distribution ratios are dense pores I, 1 / 64mm 2 , the distance between hollow cylinders and hollow cylinders is 8mm; loose pores II, 1 piece / 2500mm 2 , the distance between the hollow cylinder and the hollow cylinder is 50mm, and the other operating conditions are the same. The results obtained after pre-cooling are shown in Table 4 below:

[0062] Table 4 Effects of different devices (density distribution) assisted vacuum precooling methods on rice quality and process parameters

[0063]

[0064] Remarks: The data of texture and color difference are detected after refrigerated for 3 days. L*: means black and white, the larger the value, the whiter th...

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Abstract

The present invention belongs to the field of rice processing devices and relates to a device used for assisting vacuum pre-cooling of rice. The device is composed of hollow body base plates (19), accommodating cavities (17) and a refrigerating medium (20); the accommodating cavities (17) are embedded in the hollow body base plates (19) and vertically penetrate sealed hollow areas formed by upperand lower planes of the hollow body base plates (19) and other parts of the accommodating cavities (17) except the hollow body base plates (19); and the hollow areas are internally filled with the refrigerating medium (20). After a low-temperature treatment of the device, a vacuum box (1) arranged inside a vacuum pre-cooling system and the vacuum pre-cooling system are combined to finish pre-cooling of the cooked rice. The assist device unit can conduct the assist vacuum pre-cooling of the cooked rice, is used for obtaining rapid pre-cooking rate, low water loss and high color and luster indexes, and can also at the same time realize large-scale industrial production of the rice.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a device for assisting vacuum precooling of rice. Background technique [0002] Vacuum precooling is mainly to cause the evaporation of free water in the material by reducing the pressure of the material environment, and the huge latent heat required for water evaporation comes from the material itself, so that the material can be cooled rapidly. It is not difficult to find that the material has a certain pore structure and free water content is the key to ensure that it can be vacuum precooled. Rice has obvious void structure and high moisture content, which is very suitable for vacuum precooling technology in principle. Related research results also show that compared with air cooling, rice can obtain extremely fast pre-cooling rate under vacuum pre-cooling conditions. On the contrary, although vacuum pre-cooling can obtain a fast pre-cooling rate, the cos...

Claims

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Application Information

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IPC IPC(8): A23L5/30A23L7/10
CPCA23L5/30A23L7/1975A23V2002/00A23V2200/04
Inventor 廖彩虎
Owner SHAOGUAN COLLEGE
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