RU95114165A - UNIVERSAL SUPER HIGH FREQUENCY DRYING UNIT (OPTIONS) - Google Patents

Claims (9)

1. A universal microwave drying installation containing a working chamber, inside which there are emitting antennas of a microwave dividing and emitting system connected to a microwave source, characterized in that the microwave dividing and emitting system creates a uniform radiation field on the surface of the stack to be dried material and the mode of the traveling wave along its height, made of series-connected waveguide-slotted directional couplers with transitional attenuations varying due to the choice of the slot length So that each couples the equal portion of the energy of the microwave source, and connected to taps waveguide slot antennas, the slots for this antenna arrangement, their sizes and spacing provides the necessary uniformity of the radiation field along the antenna.  2. The installation according to claim 1, characterized in that it is equipped with a control and adjustment control system during drying of the microwave energy source with a load that increases the drying efficiency and reliability of the microwave energy source.  3. Installation according to claim 1, characterized in that a recuperative heat exchanger is included in the moisture removal system, increasing the efficiency of the moisture removal system.  4. Installation according to claim 1, characterized in that a feedback system is included in the drying process control system, consisting of meters of air parameters in the working chamber and at its output, a reflected wave level meter and a control computer, which optimizes energy consumption during drying. 5. Universal microwave drying installation containing a working chamber with a conveyor located therein, radiating antennas of the microwave energy division and emission system, which is connected to the microwave source, characterized in that the microwave energy division and emission system is made in the form of one or more located parallel to the conveyor, non-resonant waveguide-slot antennas, short-circuited at the end, and by choosing the location of the slots, their length and the distance between them, uniformity of the radiation field is achieved I across the flow of the dried material, reducing the radiated power along the flow and creating a radiation field with several maxima in the vertical plane along the flow, grouped around the direction determined by the Brewster angle, and also the fact that the scraper conveyor has the height of the dielectric scrapers h _c and the distance between them L must satisfy the ratios:
h _c ≲ h _D (2 + j) / 3; L≲ 4h _D (1-j) / (3tgβ _e ),
where h _D is the optimal layer thickness during active drying of this material with heated air;
j = h _M / h _D , h _M is the minimum allowable thickness of the material layer at which the fraction of absorbed microwave energy is not less than a given;
β _e is the angle of repose of the dried material.  6. The installation according to claim 5, characterized in that the waveguide path includes a control and regulation system during drying, matching the microwave energy source with the load, increasing the drying efficiency and reliability of the microwave source.  7. Installation according to claim 5, characterized in that the moisture removal system comprises a recuperative heat exchanger that increases the drying efficiency.  8. The apparatus according to claim 5, characterized in that the drying process control system comprises a feedback system consisting of meters of air parameters in the working chamber and at its output, a reflected wave level meter and a control computer that optimizes energy consumption during drying.  9. Installation according to claim 5, characterized in that a preheating section is located in front of the microwave drying section, which increases the productivity of the dryer.