Blending method of dry coke quenching dust-removal ash in coal blending process

Abstract

The invention discloses a blending method of dry coke quenching dust-removal ash in a coal blending process. The blending method comprises the following steps: transporting dust-removal ash generated by dry coke quenching every day to a coal storage yard through an ash discharge opening, arranging the dust-removal ash near low-sulfur coking coal of which the content of sulfur is less than 0.4% and low-ash meager lean coal of which the content of ash is less than 8.5% which can be blended for separately storing; according to the blending ratio required by the blending instruction of a forklift in a coal blending workshop, fully and uniformly blending the dry coke quenching dust-removal ash, low-sulfur coking coal and the low-ash meager lean coal at a weight ratio of 1:5:5 to form novel mixed dust-removal ash; conveying the mixed dust-removal ash to a coal blending bin, blending the mixed dust-removal ash and 1 / 3 coking coal, gas coal, coking coal and meager lean coal at a weight ratio of 7: 3 and rich coal to form into-the-furnace coal, crushing the into-the-furnace coal, adding water and conveying to the coal storage bin for coking coal production to replace partial meager lean coal for return blending and coking, wherein the mixed dust-removal ash, the 1 / 3 coking coal, the gas coal, the coking coal and meager lean coal at a weight ratio of 7:3 and the rich coal respectively account for 15%, 32%, 15%, 21% and 17% of the into-the-furnace coal in weight ratio. The process is convenient to operate and has the characteristic of high flexibility.

Description

[0001] technical field [0002] The invention relates to a coal blending process for coking by substituting part of the lean coal for coking by optimizing the coal blending structure, which is a method for realizing closed-circuit recycling of the dry coke dust removal ash and belongs to the technical field of waste treatment. Background technique [0003] As a new technology, dry coke quenching device can not only improve the quality of coke, reduce the ratio of coke to furnace, increase the production capacity of blast furnace, reduce the cost of steel production, but also recover heat energy from hot coke to generate steam for power generation to obtain direct Economic benefits, so it is widely used in large and medium-sized iron and steel enterprises, but due to the large amount of CDQ by-product dedusting, it is difficult to effectively recycle and treat, so it is also increasing year by year. The advantages of dry quenching technology are undoubted, but in the dry quen...

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Problems solved by technology

[0003] As a new technology, dry coke quenching device can not only improve the quality of coke, reduce the ratio of coke to furnace, increase the production capacity of blast furnace, reduce the cost of steel production, but also recover heat energy from hot coke to generate steam for power generation to obtain direct Economic benefits, so it is widely used in large and medium-sized iron and steel enterprises, but due to the large amount of CDQ by-product dedusting, it is difficult to effectively recycle and treat, so the waste is also increasing year by year

The advantages of dry quenching technology are undoubted, but in the dry quenching furnace, due to the mutual displacement friction of coke and the burning loss of coke, a certain amount of dedusted coke powder is produced compared with wet coke quenching, and its output accounts for about 10% of the coke output. 2% to 3%, the coking plants of most iron and steel enterprises deal with CDQ dust removal ash: first, carry out internal digestion treatment, and use it for sintering with dust removal ash, which is often easy to make dust removal in the process of transportation in different places The tiny particles of ash will overflow and scatter, which will cause secondary pollution to the atmospheric environment, waste manpower and material resources, increase transportation costs, and reduce economic benefits; the second is to sell the dust removal ash to other furnace material companies as fuel. The treatment method forces a large backlog of dedusting ash, the takeaway price of dedusting ash is low, and the processing process is troublesome, so it is difficult for the enterprise to produce better economic benefits; the third is to add dedusting ash and tar residue for coal blending and coking, often with a small range of proportions, which cannot All equipped with treatment, the process needs to be improved, and the coke quality stability is poor

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