Ultrasonic enhanced low-pressure superheated steam drying device and method

A technology of superheated steam and ultrasonic enhancement, applied in the direction of drying gas arrangement, drying solid materials, local agitation dryers, etc., can solve the problems of low drying rate, loss, enzymatic oxidation and browning of nutrients, etc., to improve the activity level , Improve the organizational structure, the effect of high drying rate

Inactive Publication Date: 2017-09-01
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low drying rate, enzymatic oxidative browning and nutrient loss in the above conventional drying process, the present invention provides an ultrasonically enhanced low-pressure superheated steam drying device and method

Method used

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  • Ultrasonic enhanced low-pressure superheated steam drying device and method
  • Ultrasonic enhanced low-pressure superheated steam drying device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After pears are washed, peeled, cut, and cored, cut into pear slices with a thickness of 4mm, spread the pear slices of about 50g on the ultrasonic radiation plate, close the door of the drying box 19; open the vacuum pump 18, and vacuumize Make the pressure in the drying box 19 drop from normal pressure to the range of 5 ~ 10kPa within 1min, turn off the vacuum pump 18; 3 The flow rate of / min is passed into the drying oven 19. After 10s, the pressure in the drying oven 19 rises to normal pressure, and the process of inactivating the enzyme by steam is carried out. The corresponding temperature is 100°C, and the inactivation time is maintained for 30s. If the time is too short, the enzyme inactivation will not be complete. If the time is too long, the tissue structure will be damaged due to overheating; after the steam kills the enzyme, turn on the vacuum pump 18, and after the pressure is reduced to 10kPa again, adjust the vacuum rate by controlling the vacuum regulati...

Embodiment 2

[0034] After fresh jujube is washed, peeled, pitted and cut, cut into jujube slices with a thickness of 4 mm, spread the jujube slices of about 50 g on the ultrasonic radiation plate 9, close the door of the drying box 19, and turn on the vacuum pump 18 for vacuuming , the pressure in the drying box 19 is reduced from normal pressure to the range of 5~10kPa within 1min, and the vacuum pump 18 is turned off; 3 The flow rate of / min is passed into the drying oven 19. After 10s, the pressure in the drying oven 19 rises to normal pressure, and the process of inactivating the enzyme by steam is carried out. The corresponding temperature is 100°C, and the inactivation time is maintained for 30s. If the time is too short, the enzyme inactivation will not be complete. If the time is too long, the tissue structure will be damaged due to overheating; after the steam kills the enzyme, turn on the vacuum pump 18, and after the pressure is lowered to 7kPa, adjust the vacuum rate by controll...

Embodiment 3

[0037] Pick Eucommia ulmoides that are mature, bright in color and uniform in size, weigh about 50g and spread them on the ultrasonic radiation plate 9, close the door of the drying box 19, and turn on the vacuum pump 18 to evacuate, so that the pressure in the drying box 19 is within 1min Drop the vacuum pump 18 from normal pressure to the range of 5-10kPa; 3 The flow rate per minute is passed into the drying oven 19, and after 10 seconds, the pressure in the drying oven 19 rises to normal pressure, and the process of inactivating enzymes by steam is carried out, and the corresponding temperature is 100°C. Maintain the enzyme inactivation time for 30s. If the time is too short, the enzyme will not be completely inactivated. If the time is too long, the tissue structure will be damaged due to overheating; Adjust the vacuum rate, and at the same time pass steam to provide dry medium, use steam valve 2 to control the flow. By controlling the vacuum regulating valve 16 and the s...

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Abstract

The invention relates to a drying device and method using contact ultrasound to strengthen low-pressure superheated steam. The device is equipped with a drying box connected with a vacuum pump, a boiler, a steam storage tank, an ultrasonic generator, an ultrasonic transducer and an ultrasonic radiation plate , the boiler is connected to the steam storage tank through a conduit, the steam storage tank is connected to the drying box through a conduit, and a steam injection port is provided in the drying box at the connection point, the ultrasonic transducer is arranged in the drying box, and the drying box is connected to the drying box through a wire. The ultrasonic generator outside the box is connected, and the ultrasonic radiation plate is set on the ultrasonic transducer; this method uses low-pressure superheated steam as the drying medium, on the one hand, the boiling point of the water in the material is reduced through the low pressure, which is conducive to the evaporation of water, on the one hand, it is different from the normal Compared with high-pressure superheated steam, the use of low-pressure superheated steam reduces the drying temperature, thereby reducing the risk of thermal decomposition of active ingredients to a certain extent, while ensuring a higher drying rate.

Description

technical field [0001] The invention belongs to the technical field of drying and processing of agricultural products, and in particular relates to a drying device and method using contact ultrasound to strengthen low-pressure superheated steam. Background technique [0002] Drying is to evaporate and remove the moisture in the material by heating, so as to reduce the moisture content and activity of the material, and achieve the purpose of maintaining product quality and extending the storage period. Drying is one of the important processes in agricultural product processing and a key unit operation to ensure product quality. Conventional drying methods include drying in the sun and drying in the shade. The drying cost is low, but the time is long, and the product quality is too dependent on the environment and climate, and it is also prone to external pollution. At present, the commonly used drying method is hot air drying, which has the characteristics of simple operatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B9/06F26B21/00F26B7/00
Inventor 刘云宏李晓芳王乐颜于慧春关随霞
Owner HENAN UNIV OF SCI & TECH
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