Low-pressure superheated steam integrated tower type drying device and method

Abstract

The invention relates to a low-pressure superheated steam integrated tower type drying device. The drying device is characterized in that one end of a water tank is connected to a drying tower through a limit switch electromagnetic valve, the other end of the water tank is connected with a liquid ring vacuum pump, the drying tower is provided with an exhaust valve, a tower plate transmission unit, a superheated steam generation unit and a drain valve from top to bottom, the end part of a motor is connected to a driving chain wheel, the driving chain wheel is connected with a driven chain wheel through a conveying chain, and a plurality of tower plates are uniformly arranged on the conveying chain at intervals; and an ultrasonic generator is connected to an ultrasonic atomizer, a superheater is arranged at the upper end of the ultrasonic atomizer, and the superheater is connected to a PLC temperature controller. The drying device is scientific and reasonable, meanwhile, the ultrasonic steam generator is introduced while a waste-heat recoverer is arranged, the conveying chain is arranged, the whole device is optimized, the integrated design of the device is achieved, while the device is simplified, the occupied area of the device is reduced, the material drying uniformity is improved, and the drying process is more energy-saving and more efficient.

Description

technical field [0001] The invention belongs to the technical field of drying equipment for agricultural products, and relates to a production and processing device for dried fruit and vegetables, in particular to a low-pressure superheated steam integrated tower drying device and method. Background technique [0002] Fresh fruits and vegetables are easily affected by microorganisms or enzyme reactions, are not resistant to storage, and have a short shelf life. Drying them can reduce water activity, limit microbial growth and chemical reactions, and prolong storage time. [0003] Low-pressure superheated steam drying (LPSSD) refers to a drying method that uses superheated steam to directly contact the material to be dried in a low-pressure environment to remove moisture. Due to its large heat transfer coefficient, no mass transfer resistance, no oxygen in the dry environment, and the low-pressure environment alleviates the product quality deterioration caused by temperature ...

AI Technical Summary

Problems solved by technology

The main problem of this technology is: the device does not recover waste heat, the equipment is scattered, and the floor area is large. The vacuum pump directly pumps the drying box and it is easy to cause damage to the vacuum pump.

The main problem of this technology is that the device cannot ensure that the material is heated evenly in the drying chamber, and the moisture content of the product cannot be guaranteed.

The main problem of this technology is that the device occupies a large area, and the waste heat cannot be utilized, and the vacuum pump will damage the pump if it is directly pumped into the drying room for a long time

The main problem of this technology is that although the device is designed for waste heat recovery and can work in multi-stage series, during the drying process, the materials of different layers passing through the heat conduction oil pipe will be heated unevenly, and the moisture content of the product after drying cannot be guaranteed.

[0010] Since the low-pressure superheated steam drying device requires a lot of components, it increases the complexity of the whole system, occupies a large area, and is difficult to promote and use in the market.

In addition, the existing device cannot ensure that the material is evenly heated while drying, resulting in a decrease in the quality of the dried product and a decrease in production efficiency

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