Drying and moulding integrated process for low rank coal

Abstract

The invention provides an integrated process for drying forming of low-rank coal. The process comprises the following steps: (1) crushing the low-rank coal to be dried so that the particle size of the crushed low-rank coal particles is less than 50 millimeters; (2) delivering the crushed low-rank coal into a roller dryer quantitatively; (3) rotating the roller dryer and introducing heating fluid to the roller dryer to heat the coal in a roller; (4) collecting the coal discharged from the roller dryer, and delivering the heating fluid, dust carried along with the heating fluid, and water vapor from the low-rank coal into a dust processing system; (5) classifying the low-rank coal collected from the roller dryer according to certain particle size, and delivering the low-rank coal with the particle size of larger than the certain particle size to a product warehouse as a first product; and (6) delivering the low-rank coal with the particle size of smaller than the certain particle size to an extrusion forming device through a sealed delivery device to be extruded and formed together with the coal dust collected from the dust processing system, and delivering the formed product to the product warehouse as a second product.

Description

technical field [0001] The invention relates to the field of coal drying treatment, in particular to an integrated drying and forming process of low-rank coal. Background technique [0002] my country's energy resources are dominated by coal, and coal consumption accounts for about 60% of my country's primary energy consumption. For a long time, bituminous coal and anthracite have been the main mining and utilization of coal resources in my country. With the continuous increase of energy consumption in my country and the excessive exploitation of bituminous coal and anthracite resources, the development and utilization of low-rank coal is becoming more and more important. [0003] Low-rank coal refers to coal with a lower degree of coalification, such as lignite and long-flame coal. Low-rank coal reserves account for about 50% of my country's total coal resources. However, due to the high moisture content of low-rank coal (usually 20wt%-60wt%) and low calorific value (usua...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to propose a new drying treatment method for low-rank coal, which overcomes the shortcomings of the prior art, integrates the drying and molding of low-rank coal, can efficiently remove moisture in low-rank coal, and simultaneously It can effectively solve the problems of dust, spontaneous combustion, backwater (tide) and other problems of low-rank coal after drying

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