High-sulfur power raw coal sorting process

Abstract

The invention relates to a high-sulfur power raw coal sorting process which comprises the following steps of: separating high-sulfur power raw coal into 100(50)-13(6) mm lump raw coal and 13(6)-0 mm power raw coal; leading the 100(50)-13(6) mm lump raw coal into a lump coal heavy medium shallow slot sorting system to discharge washed fine coal and gangue; leading the 13(6)-0 mm power raw coal into a heavy medium cyclone sorting system for sorting to discharge washed power fine coal and gangue; leading the gangue produced by both the lump coal heavy medium shallow slot sorting system and the heavy medium cyclone sorting system to enter an autogenous medium cyclone gangue sorting system for sorting to discharge ferric disulfide and electric coal, and simultaneously diverting fine ferric disulfide as a supplementary medium of the lump coal heavy medium shallow slot sorting system and the heavy medium cyclone sorting system; and finally processing the products of washed power fine coal, washed lump fine coal, ferric disulfide, electric coal and the like. The sorting system provided by the invention has simplified links, small floor space and low operating cost, the investment and operating cost of the whole factory is reduced by 15-20%; and meanwhile, the sorting system has good desulfurization property and obvious energy saving and emission reduction effects.

Description

technical field [0001] The invention relates to a coal separation process, in particular to a high-sulfur-containing raw coal separation process. Background technique [0002] my country's proven coal reserves have reached 1,159.776 billion tons. According to coalfield survey data, coal reserves with a sulfur content > 1.5% are 184.88 billion tons, and coal reserves with a sulfur content > 3% in the country are 85.49 billion tons; among them, high-sulfur coal Shanxi Province and Guizhou Province have the largest quantity, reaching 40.65 billion tons and 16.925 billion tons respectively; the sulfur content is highest in Chongqing in the southwest region, reaching 4-6%. [0003] In 2009, my country produced 2.97 billion tons of coal, with an average sulfur content of 1.1%. According to statistics, medium and high sulfur coal (St.d>2%) accounted for 14%. The annual output of medium and high sulfur coal is: 29.7*14%=416 million Ton. Among them, more than 70% are used as...

AI Technical Summary

Problems solved by technology

[0006] (1), the sorting process is complicated, the system links are many, the floor area is large, and the operating cost is high

The process is composed of three sets of production systems, which are connected with many turnover links and occupy a large area. A set of medium recovery system needs to be designed separately for the heavy medium separation of lump raw coal. Magnetite is used as the medium, and the operating cost is high; High-sulfur gangue is sorted by ladder jumping or shaking table, because the processing capacity of a single equipment is low, there are many system equipments, and the plant area is large;

[0007] (2) The separation precision of gravity coal preparation is low, the desulfurization effect is poor, and the sulfur content of washed clean coal is high

The imperfection degree of jig separation is 0.18-0.20, the sulfur content of the power-washed clean coal is 2.5-3.0%, and the desulfurization efficiency of inorganic sulfur in jigging coal preparation is only about 60%;

[0008] (3) When sorting materials with a wide particle size range by ladder jumping and shaking table, the unit processing capacity is small and the sorting effect is too poor; especially in order to ensure coarse particle size separation, fine particle size is easy to directly enter the boiling coal, resulting in Boiling coal has high sulfur content, so it can be used to control SO in the desulfurization system of the power plant 2 (According to the current operation of sulfur fixation and flue gas desulfurization facilities in the furnace of low calorific value coal power plants, the sulfur content of fuel is required to be less than 4.5%)

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