A device and method for removing moisture from coal

Abstract

The invention discloses a device and a method for removing water in coal, and belongs to the field of coal dehydration. Firstly, a coal sample is put into a reaction kettle and the reaction kettle isthen sealed; then high-pressure and high-temperature water vapor is introduced into the reaction kettle, and pressure maintaining is conducted; then a lower sealing piston is controlled to be opened to punish instantaneous ejection blasting, and the water vapor in the reaction kettle and water difficult to remove in the coal sample are discharged together. The reaction time is short, the operationis safe and stable and the cost is low. The device and method is suitable for large-scale production, so that the invention provides a new process breakthrough for further deep dehydration of coal.

Description

Technical field: [0001] The invention relates to a device and method for removing water in coal, and is especially suitable for the device and method for removing water in coal by using steam explosion technology for dehydration in coal enterprises. Background technique: [0002] Moisture is an important component of coal and an important indicator of coal quality. Moisture in coal is harmful to the process of coal processing and utilization. During coal combustion, gasification, and coking, the presence of moisture will absorb additional heat and reduce the thermal efficiency of the process. In the process of coal transportation, high moisture means waste of transportation capacity. Therefore, in coal trade, moisture has become an important pricing basis, and the coal price will decrease when the moisture is high. The moisture in coal can be divided into free water and combined water. Existing coal preparation dehydration equipment such as dehydration screens and centrifu...

AI Technical Summary

Problems solved by technology

The combination of combined water and the substance is firm, and the combined water can only be released when the crystal of the substance is destroyed by heating, which cannot be removed by general physical dehydration equipment; the combined water is combined by electrostatic force and hydrogen bond force, and has high Viscosity and shear strength, so it cannot be removed by ordinary mechanical methods. If the drying method can be used to remove part, but when the material is in contact with air with high humidity, the moisture will be reabsorbed, and the removal effect is not high; capillary Moisture is related to the porosity of coal. The larger the porosity, the more moisture is retained. The current dehydration method can remove part of it, but not all of it

Therefore, the current coal preparation dehydration equipment can effectively remove the free water existing in various large pores and the outer surface of coal particles, while the removal of other water remains to be studied

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