Method for detecting moisture in coal by vacuum heating
A technology of vacuum heating and moisture, applied in measuring devices, analyzing materials, weighing by removing certain components, etc., can solve the problems of affecting the accuracy of the measurement, complicated operation, etc., to improve accuracy, save costs, and improve thermal sensitivity. The effect of the condition
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[0011] The present invention will be described in further detail below through examples, and the following examples are explanations of the present invention and the present invention is not limited to the following examples.
[0012] Example.
[0013] The steps of the method for measuring moisture in coal by vacuum heating in this embodiment are as follows: take a certain quality coal sample, place the coal sample in a vacuum heating and drying device, and then reduce the vacuum degree in the vacuum heating and drying device to 94kPa ( The pressure is 7kPa), and then the coal sample is heated to 40°C for drying by heat conduction and / or heat radiation; the vacuum environment greatly reduces the boiling point of free water in the coal sample, and quickly draws out the vaporized steam, forming around the coal sample In the negative pressure state, a large humidity gradient is formed between the inner and outer layers of the coal sample particles and between the surface and the ...
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