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Microwave detection method and apparatus for moisture contained in coal on mine conveyer belt

A microwave detection and conveyor belt technology is applied in the field of coal moisture detection, which can solve problems such as incompatibility

Inactive Publication Date: 2009-08-12
SHANDONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

The above methods are not suitable for the detection of coal moisture content on the conveyor belt at the underground transfer point

Method used

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  • Microwave detection method and apparatus for moisture contained in coal on mine conveyer belt
  • Microwave detection method and apparatus for moisture contained in coal on mine conveyer belt

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, the present invention is described in further detail: the microwave detection method of coal moisture content on the mine conveyer belt, comprises the following steps: 1) determination of microwave frequency: under dry situation and after adding water by coal under different frequencies to microwave signal The attenuation test is to determine the maximum absorption frequency of microwave signals by water, so as to determine the microwave frequency to be selected. The microwave frequency is determined to be 9.7GHz through experiments. For specific test methods, see figure 1 ; 2) Determine the relationship between coal moisture content and microwave signal attenuation: first measure the microwave attenuation after passing through the conveyor belt under various samples, and then use the drying method to accurately measure the coal moisture content on the conveyor belt. This draws the relationship curve of microwave attenuatio...

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Abstract

The invention discloses a microwave detection method and microwave detection equipment for moisture contained in coal on mine conveyor belts, and belongs to the technical field of the detection of water content in the coal. The microwave detection method comprises the steps of: 1) determination of microwave frequency; 2) determination of the relation between the water content of the coal and the attenuation of microwave signals; 3) error correction; and 4) acquisition of the water content of the coal by fitting a relation curve between the attenuation of the microwave signals and the water content of the coal. The method can quickly detect the water content of the coal on the conveyor belts, is not susceptible to the external environment, and is suitable for detecting the moisture contained in the coal on the conveyor belts.

Description

technical field [0001] The invention relates to a method and equipment for detecting moisture in coal. Background technique [0002] With the improvement of coal mine mining intensity and mechanization level, while coal mines increase coal production, dust production and floating coal dust in mine operation sites are also greatly increased. Coal dust has caused great harm to workers and production safety: on the one hand, coal dust seriously endangers the health of on-site workers; Practice has proved that: the higher the moisture content in coal, the lower the floating amount of particles; the lower the moisture content in coal, the higher the floating amount of particles. Therefore, coal seam water injection and coal powder spraying are important means to increase moisture in coal and reduce floating amount. And how to accurately and quickly detect the moisture content in the coal on the conveyor belt (especially at the transfer point) is very important for controlling t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/12
Inventor 程学珍逄明祥王永保王绪友张存磊李兆庆张亮
Owner SHANDONG UNIV OF SCI & TECH
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