Device for microwave drying of bulk material

 

(57) Abstract:

The invention relates to microwave drying and can be used for drying bulk materials in the chemical, pharmaceutical, agricultural and other sectors of the economy. Device for microwave drying of bulk materials contains the heating chamber 1, which represents a multimode waveguide, which comprises a conveyor 2, consisting of sections formed by the conveyor and plates of rectangular shape, and the height of the rectangular plates is less than /2, and the distance between the plates is greater where l is the length of the working wave quarter-wave chokes 3 absorber 4 is placed on the inlet and outlet of the heating chamber 1, a microwave generator 5, each of which is connected through a segment of the waveguide 6 to the irradiator installed above the heating chamber, boot 7 and unloading 8 tunnels attached to the heating chamber. 2 Il.

The invention relates to sverkhvysokochastotnoi drying and can be used for drying products in the chemical, pharmaceutical, agricultural and other sectors of the economy.

A device for microwave heating, containing two generators[1]

However, this device does not allow to obtain high efficiency in drying products, because not provided sufficient energy flux density for continuous drying process.

A device for microwave drying of fine-dispersed semiconducting materials, comprising a generator connected through a waveguide to the irradiator installed above the conveyor [2]

However, this device has low efficiency and does not provide uniform heating, because it is intended for drying of fine materials and cannot be effectively used for drying granular coarse materials in mind that does not provide uniform heating of large quantities of substances in a continuous mode.

Closest to the proposed invention is a conveyor oven [3] contains a microwave generator connected to the heating chamber, loading and unloading tunnels connected to the heating chamber, a conveyor in the form of sections formed by plates of rectangular shape, mounted across the conveyor.

However, this device does not allow for uniform heating of the granular product, because it is meant for drying Otdelenia present invention is a device for microwave drying of solids in a continuous mode with a high performance.

The technical result of the invention is to increase efficiency and ensure uniform heating products drying in continuous mode.

This technical result is achieved in that the device for microwave drying of bulk material includes a microwave generator connected to the heating chamber, loading and unloading tunnels, attached to the heating chamber, a conveyor, consisting of sections formed by the conveyor and plates of rectangular shape, placed crosswise of the conveyor, additionally introduced microwave generators, each microwave generator is connected through a section of waveguide to the irradiator installed in the heating chamber above the conveyor, in a checkerboard pattern, the heating chamber is equipped with a quarter-wave choke absorbers placed on the inlet and outlet of the heating chamber, the height of the rectangular plates does not exceed /2,, and the distance between the plates is greater where l is the length of the waves.

The proposed design provides the excitation of the working chamber, representing the multimode waveguide, which allows to obtain a uniform distribution of the electric component of the field in the cross section of the chamber. The presence of gener energy density per unit volume of processed products, which increases the efficiency of the device.

The invention is illustrated in the drawing, where Fig. 1 General view of the device of Fig. 2 is a section along a-a in Fig.1.

Device for microwave drying of bulk material contains the heating chamber 1, which represents a multimode waveguide, which comprises a conveyor 2, consisting of sections formed by the conveyor and plates of rectangular shape, and the height of the rectangular plates is less than /2, and the distance between the plates is greater where l is the length of the working wave. The heating chamber is equipped with a quarter-wave choke with 3 sinks 4, placed at the inlet and outlet chambers. To the heating chamber connected to the microwave generator 5, each generator in a checkerboard pattern are connected through a segment of the waveguide 6 to the irradiator installed above the heating chamber. The heating chamber is connected with the boot 7 and unloading 8 tunnels. The conveyor is designed for drying solids consists of sections having a rectangular cross-section.

One option may be a conveyor designed as follows: two guides (such as chains) attached metal scrapers, made of food grade aluminum alleviate half wavelength, and the section length is the distance between the scrapers (they are walls and partitions) must be greater than the wavelength, and the width of the scraper equal to the width of the working chamber.

Thus section has a rectangular cross-section. The number of sections depends on the length of the entire installation. For the claimed design their number varies from 45 to 55.

The size of the sections is selected based on the following: when the depth of the section more than l/2 of the electromagnetic wave does not penetrate the entire depth of the surface of the working chamber, and when the distance between the sections is less than the electromagnetic energy does not penetrate into the section.

Device for microwave heating works as follows.

The bulk material is fed through the loading tunnel 7 on the conveyor 2 and is supplied to the heating chamber 1, which represents a multimode waveguide-fed system of generators 5, staggered and connected with the working chamber through the waveguide 6. Taking into account some of the differences of the frequencies of the oscillators is achieved multimode excitation of the working chamber and a uniform distribution of the high-frequency field. The distance between the rectangular plates that make up the section of the pipeline, the greater the wavelength, and Viseu and its output are quarter-wave chokes 3 and the absorber 4.

Then the product gets into the discharge tunnel 8.

The proposed design provides the excitation of the working chamber, representing the multimode waveguide, which allows to obtain a uniform distribution of the electric component of the field in the cross section of the chamber. A system of generators, arranged in a checkerboard pattern, provides the excitation of many types of waves that can increase the energy density per unit volume of processed products, as well as increases the efficiency of the device for microwave drying of bulk material.

Conveyors with solid lifters, the geometrical dimensions of which are rigidly determined by the length of the operating wave, first proposed for use in conveyor devices for microwave drying of bulk materials, which improves the efficiency of technological processes.

Thus, the device for microwave drying of bulk material allows to obtain a uniform power distribution over a large width and a large area of material processing, and product is in the treatment area controlled by a time determined by the speed of movement of the conveyor.

amerol heating, loading and unloading tunnels, attached to the heating chamber, a conveyor, consisting of sections formed by the conveyor and plates of rectangular shape, placed crosswise of the conveyor, characterized in that additionally introduced microwave generators, each microwave generator is connected through a section of waveguide to the irradiator installed in the heating chamber above the conveyor, in a checkerboard pattern, the heating chamber is equipped with a quarter-wave choke, with the absorber placed at the inlet and the outlet of the heating chamber, the height of the rectangular plates is less than /2, and the distance between the plates is greater , where the length of the wave.

 

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