Microwave-vacuum freezing drying dehydration process integrated industrialized technology

A vacuum freeze-drying and microwave drying technology, which is used in drying solid materials, heating to dry solid materials, and non-heating to dry solid materials, etc., can solve the problems of high maintenance and maintenance costs, large one-time investment, and long production cycle. , to achieve the effects of high production efficiency, extended shelf life and rapid dehydration

Inactive Publication Date: 2008-01-09
食品行业生产力促进中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it consumes a lot of energy, has a long production cycle, a large one-time investment, and high repair and maintenance costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Carrots undergo conventional pretreatments such as sorting, cleaning, peeling, cutting, and blanching; carry out microwave drying, with microwave power 400W-900W for 1-10 minutes in the early stage, and 150W-400W for 5-30 minutes in the later stage. Microwave drying removes 30% to 50% of the water; then the microwave pre-dehydrated material is then subjected to vacuum freeze-drying, that is, the pre-dehydrated material is evenly spread on the freeze-drying tray, and the loading capacity is 10kg / m 2 ~20kg / m 2 After laying the tray, put it into the quick-freezing warehouse for quick freezing, quick-freezing to below -18°C, quickly push the quick-frozen material into the vacuum drying cabin, and carry out vacuum freeze-drying. The temperature of the frozen layer does not exceed -25°C during freeze-drying. The surface temperature of the dry material does not exceed 80°C, and the vacuum degree in the warehouse is 13-130Pa. Dry for about 5-8 hours, and stop freeze-drying whe...

Embodiment 2

[0016] After routine pretreatment such as selection, cleaning, blanching, slicing, and color protection, the apples are subjected to microwave drying. The microwave power in the early stage is 400W-900W for 1-10 minutes, and the microwave power in the later stage is 150W-400W for 5-30 minutes. Remove 30% to 50% of the water; then microwave pre-dehydrated apple slices and then vacuum freeze-dry, that is, spread the apple slices evenly on the freeze-drying tray, with a loading capacity of 10kg / m 2 ~20kg / m 2 After laying the tray, put it into the quick-freezing warehouse for quick freezing, quick-freezing to below -18°C, quickly push the quick-frozen material into the vacuum drying cabin, and carry out vacuum freeze-drying. The temperature of the frozen layer does not exceed -25°C during freeze-drying. The surface temperature of the dry material does not exceed 80°C, and the vacuum degree in the warehouse is 13-130Pa. Dry for about 5-8 hours, and stop freeze-drying when the wate...

Embodiment 3

[0018] Conventional pretreatment of turmeric; microwave drying, microwave power 400W ~ 900W, time 1 ~ 10min, microwave power 150W ~ 400W, time 5 ~ 30min, remove 30% ~ 50% of the water through microwave drying; then microwave Pre-dehydrated turmeric is then vacuum freeze-dried, that is, the turmeric is evenly spread on the freeze-dried tray, and the loading capacity is 10kg / m 2 ~20kg / m 2 After laying the tray, put it into the quick-freezing warehouse for quick freezing, quick-freezing to below -18°C, quickly push the quick-frozen material into the vacuum drying cabin, and carry out vacuum freeze-drying. The temperature of the frozen layer does not exceed -25°C during freeze-drying. The surface temperature of the dry material does not exceed 80°C, and the vacuum degree in the warehouse is 13-130Pa. Dry for about 5-8 hours, and stop freeze-drying when the water content reaches below 5%.

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PUM

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Abstract

The invention discloses an integration industrialization new technology of the microwave-vacuum dehydration freeze-drying process, integrated combines the microwave freeze-drying technology and vacuum drying dehydration technology, carries on in grading, that is, using the reasonable dehydration drying method which combines the pre-microwave dehydration and the evening vacuum freeze-drying dehydration, its result are perfects the dehydration process, reduces the drying time and the energy consumption, improves the product quality, is a high-quality, highly efficient, energy-saving technology integration new technology. The invention can rapidly dehydrate, has high production efficiency and shorts the 1 / 2 to 1 / 3 time of the simple dehydration process by vacuum freeze-drying; energy saving effect is significant, can reduce energy consumption 30 to 40 percent of the simply freeze-dried by vacuum dehydration process.

Description

technical field [0001] The invention relates to the technical field of drying. Background technique [0002] Dehydration is a common method of preserving food. The reduced weight of dry food can save transportation costs and extend shelf life. However, because most of the traditional drying processes use hot air drying, the quality of dried products is not good, especially for some dehydrated products with high heat sensitivity and high added value, which have inherent defects and high energy consumption. Consumers' quality requirements for products are: after drying, the product can retain the original color, aroma and taste, and has good rehydration performance, and at the same time, it is relatively low cost. [0003] Microwave is a kind of high-frequency electromagnetic wave, which has a heating effect of dielectric induction, and can be used for heating, drying, and sterilization of materials. Microwave heating is quite different from ordinary heat transfer. Through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B7/00F26B3/347F26B5/06
Inventor 周伟都冯霖姚自奇温凯
Owner 食品行业生产力促进中心
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