Method for improving fineness and particle size composition of stamped coke blended coal

Abstract

The invention relates to a method for improving fineness and particle size composition of stamped coke blended coal. According to the method, the Hardgrove grindability index and the original finenessare combined, coal difficult to grind or coal with coarse original particles is pre-ground, and pre-grinding is more targeted; through coal petrography analysis on coal having a size of greater than3mm in blended coal, which kind of coal causes unqualified granularity can be judged according to the distribution proportion of each reflectivity interval of vitrinite, the reason why the particle size of the blended coal does not reach the standard can be quickly found and adjusted in a targeted mode, and the situation that in order to improve the fineness of the blended coal, the smashing levelof all pre-smashed coal or blended coal is improved, part of coal is smashed too finely, and energy consumption is increased is avoided. The optimal particle size composition of the coal as fired isachieved by specifically crushing and controlling the ratio of the part with the particle size of more than 5mm to the part with the particle size of less than 0.5 mm. By adopting the method, the cokeobtained by coking achieves high strength and large lumpiness, and the quality level is improved.

Description

technical field

[0001] The invention belongs to the field of coking in the coking industry, and in particular relates to a method for improving the fineness and particle size composition of tamp coking blend coal. Background technique

[0002] The pulverization fineness and particle size composition of coal have a great influence on the quality of coke. Studies have shown that optimizing the fineness of coal blending can improve the caking ability of blended coal, thereby improving the quality of coke. However, the composition of each particle size of the furnace coal with the same fineness is very different, and the quality of the coke produced will also be very different. Various raw coals and different lithofacies in the same raw coal have different coking and pulverization properties. Generally, low-metamorphic coals such as long-flame coals, weakly caking coals, and gas coals, and lean coals, lean coals, and lean coals High metamorphic coal is difficult to grind, and t...