Coal quality-improving method free of waste water discharge

Abstract

The invention discloses a coal quality-improving method free of waste water discharge. The coal quality-improving method comprises the following steps of performing drying treatment on raw coal, so as to obtain dry coal at 150-200 DEG C; performing pyrolysis treatment on the dry coal, so as to obtain semicoke at 400-600 DEG C; performing quenching treatment on the semicoke and lowering the temperature of the semicoke to 50-150 DEG C; and performing cooling treatment on the semicoke. According to the coal quality-improving method, water in low-rank coal can be removed, the process is economical; process waste water generated due to the coal quality improvement is recycled is not discharged, and process gas can be recycled or sold.

Description

technical field [0001] The invention relates to a low-rank coal upgrading method, in particular to a coal upgrading method without wastewater discharge. Background technique [0002] At present, China's coal reserves account for 12% of the global coal resources, my country's low-rank coal reserves account for about 50% of the coal reserves, and the output accounts for 30% of the current total. In terms of geographical distribution, most of the reserves are concentrated in Inner Mongolia, Shaanxi, Xinjiang, Gansu, Shanxi, and Ningxia six provinces (regions), according to the age of coal formation in China, the Jurassic coal reserves are the largest, accounting for about 45% of the country's proven reserves. Except for a very small amount of anthracite, most of the others are low-rank coals such as lignite, long-flame coal, non-caking coal and weakly caking coal. Lignite is the mineral coal with the lowest degree of coalification, a brown-black, dull low-rank coal between peat ...

AI Technical Summary

Problems solved by technology

[0005] 1) Coal upgrading produces a large amount of wastewater, and wastewater treatment measures need to be added;

[0006] 2) Incomplete utilization of process gas

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