Method and device for microwave drying of thick layer of sintered fuel
A technology of microwave drying and thick material layer, applied in the direction of drying solid materials, non-progressive dryers, heating to dry solid materials, etc., can solve the problems of long drying process and low drying efficiency, and achieve a one-time dehydration increase Effect
Active Publication Date: 2020-08-28
ZHONGYE-CHANGTIAN INT ENG CO LTD
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[0006] This application provides a microwave drying method and device for a thick layer of sintered fuel to solve the technical problems of low drying efficiency and long drying process when the existing microwave drying method is used to dry a thick layer of sintered fuel.
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[0058] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.
[0059] Commonly used sintered fuels include coke powder and coal powder. Before the particle size composition detection, the sintered fuel needs to be dried. The moisture content of the sintered fuel is generally 7-15%. When microwave drying is performed, similar figure 1 with figure 2 The drying characteristics shown, the drying characteristics involve three drying stages, which are preheating and increasing speed stage, constant speed drying stage and falling speed drying stage. Among them, in the decelerating drying stage, the resistance of the internal moisture to the outward diffusion gradually increases, and the drying interface migrates inward, which is mainly controlled by the intern...
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The invention discloses a microwave drying method and device for a thick layer of sintered fuel. The microwave drying method comprises the following steps of obtaining initial weight W0 of materials,and setting and recording initial time t0; at the initial time t0, starting all microwave sources in a microwave source set, and obtaining the material weight Wi after once drying is performed every unit time; if an intermediate condition is met, enabling the microwave source set to stop working, and turning over the materials up and down; starting parts of microwave sources in the microwave source set, and obtaining the material weight Wi and the material temperature Ti after once drying is performed every unit time; and if a drying ending condition is met, enabling the microwave source set to stop working, recording drying completion time tend, and obtaining the final material weight Wend. The microwave drying method disclosed by the invention can realize intelligent and quick drying ofthe thick layer of the sintered fuel, increases a microwave drying rate, improves microwave drying efficiency, reduces time consumed in a drying process, does not require increasing the number or volume of drying containers and microwave drying equipment, and is lower in requirement for space on an application site.
Description
technical field [0001] The present application relates to the technical field of microwave drying, in particular to a microwave drying method and device for a thick material layer of sintered fuel. Background technique [0002] The sintered fuel usually needs to be dried before the particle size composition detection, so as to avoid affecting the fuel screening due to the fuel sticking to the screen and blocking the screen holes. In order to ensure that the particle size composition detection of sintered fuel is representative, the fuel sample size for particle size composition detection is usually about 2 kg. Due to the large volume of 2 kg of fuel, the surface heat conduction heating method is used for drying. For example, when the traditional oven is used for heating and drying, the drying rate is low and it takes a long time. The microwave drying method does not need to pass through the heat conduction between substances, relying on microwave penetration into the materi...
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IPC IPC(8): G01N5/04F26B3/347F26B11/04F26B25/22
CPCF26B3/347F26B11/04F26B25/22F26B25/225
Inventor 李宗平胡兵李曦曾辉
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD