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Improved vacuum pre-cooling rice processing method

A processing method and rice technology, applied in the direction of food science, etc., can solve the problems of increasing the risk of microbial contamination, uneven moisture distribution of rice, and reducing quality, so as to improve energy use efficiency, reduce water loss, and maintain quality.

Active Publication Date: 2019-04-16
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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  • Improved vacuum pre-cooling rice processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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 condensing 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 18, a cryogenic liquid circulation pump 5, a heat exchanger 21, and branch pipelines Ⅰ22, electric valve 13, flow meter 15, branch pipe Ⅱ23, electric valve 14, flow meter 16 and hose 14, vacuum box 1, vacuum pump 2, pneumatic valve 3, exhaust valve 6, drain valve 17, weight sensor 8, pressure Sensor 9 and temperature sensor 10, data processor 19 and computer 20; Condensation system is made up of refrigerating unit 4, cryogenic liquid circulating pump 5, heat exchanger 21, branch pipeline cold capacity ①, branch pipeline cooling capacity ②; Capacity ① is composed of condenser 18, branch pipeline Ⅰ22, electri...

Embodiment 2

[0041] (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 cooked rice forms a rice block with a height of 200mm. The cooking time is For half an hour, the cooking method is steam cooking, and the length and width of the rice are distributed as 1000mm.

[0042] (2) Auxiliary device group 7 is first cleaned with tap water, then sterilized with 75% low-temperature alcohol, rinsed with tap water at 4±1°C for 2 minutes, and then connected to branch pipeline II23.

[0043] (3) Before vacuum precooling, turn on the refrigeration unit 4, the cryogenic liquid circulation pump 5 and the electric valves 13 and 14, and lower the temperature of the auxiliary device group 7 and the condenser 18 to the set temperature -5 through the heat exchanger 21 ±2°C.

[0044] (4) Maintain the temperature of the main pipe 24 at -5±2°C, and control the pipeline flow rate at 80 L / min.

[0045] (5...

Embodiment 3

[0065]Embodiment 3 is the same as embodiment 1 method of operation, and the difference is that the device is different. The device used in embodiment 3 is different from the device in embodiment 1 in that the density distribution of the hollow cylinder 26 on the hollow cuboid 28 is different. Embodiment The distribution ratios selected in 3 are dense pores, 1 / 64mm 2 , the distance between the hollow cylinder 26 and the hollow cylinder 26 is 8mm; loose pores, 1 piece / 2500mm 2 , hollow cylinder 26 and hollow cylinder 26 distance 50mm, other operating conditions are identical (hollow cylinder diameter is 5mm), the result obtained after precooling is as follows:

[0066] Table 5 Effect of different device-assisted (distribution density) vacuum precooling methods on rice quality and process parameters

[0067]

[0068] Remarks: The data of texture and color difference are detected after refrigerated for 3 days.

[0069] Table 5 shows the effects of different device-assisted va...

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Abstract

The invention belongs to the field of rice processing and relates to an improved vacuum pre-cooling rice processing method. The method comprises the following steps of before vacuum precooling of rice, starting a refrigerating unit (4), a low-temperature liquid circulating pump (5) and electric valves (13,14) first, and lowering the temperatures of an auxiliary device group (7) and a condenser (18) to set temperatures through a heat exchanger (21); then, putting the cooked rice into the auxiliary device group (7), opening a vacuum pump (2) and controlling the pressure drop rate at the same time, and adjusting the opening degrees of the electric valves (13,14) according to different temperature sections where the rice is located to control the flow of branch pipelines I (22) and branch pipelines II (23) corresponding to the electric valves so that the temperature of the auxiliary device group (7) and the temperature of the condenser (18) can be controlled. The method can not only enablethe rice to be high in cooling rate and low in moisture loss but also keep the high color and luster quality of the rice. In addition, the operation is simple, and the energy consumption is low.

Description

Technical field: [0001] The invention belongs to the technical field of food processing, and in particular relates to an improved vacuum precooling treatment method for 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L5/10A23L7/10
CPCA23L5/10A23L7/10
Inventor 廖彩虎
Owner SHAOGUAN COLLEGE
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