CN1049372A

CN1049372A - A kind of blending method of coking

Info

Publication number: CN1049372A
Application number: CN 90107920
Authority: CN
Inventors: 王玉华; 高金敏; 吴宽宏; 李安; 张继淑; 高达时
Original assignee: Beijing Inst Of Fuel Gas & Coal Chemical Engineering
Current assignee: Beijing Inst Of Fuel Gas & Coal Chemical Engineering
Priority date: 1990-09-29
Filing date: 1990-09-29
Publication date: 1991-02-20

Abstract

A kind of blending method of coking, be characterized in producing coal, allocating into the clean fine coal that a certain proportion of low rotten non-caking coal replaces former coking to use, not only reduced and gone into stove coal cost, also can obtain low ash content high grade coke, improved economic benefit of enterprises greatly, start the precedent that low rotten non-caking coal is used for coal-blending coking, be applicable to coking industry.

Description

A kind of blending method of coking

A kind of blending method of coking provides the Xin Meiyuan of coal blending, expands the range of coal for coking, is suitable for coking industry.

It is usually all apparatus cementitious bituminous coal when coking by coke oven, (i.e. bottle coal, rich coal, coking coal, lean coal) and clean fine coal come refine with certain mechanical strength and lumpiness requirement coke, Beijing coke-oven plant is national maximum commodity coke manufacturer, produce 2000000 tons per year, but the feed coal ash now used is high, difficult washing, the coke ash produced is high, does not adapt to the needs of casting, metallurgical industry development.

To select low-dust low-sulfur coal kind, in clean fine coal for coking, satisfactory clean fine coal coal source is limited, higher cost, a possibility that washing low ash (less than 8%) cleaned coal, was also once inquired into the coal washery Duo Jia by manufacturer, but because China's coal characteristics are that main coking coal (gas, fertilizer, coke, thin) ash is high, difficult washing, yield is low, very huge economic loss will be caused to coal mine and coke-oven plant by washing again, thus need to develop the Xin Meiyuan of coking coal.Shenfu coal is that a kind of geological epoch is shallower, and fugitive constituent is very high, does not have the bituminous coal of caking property again, and reserves are 170,000,000,000 tons, and the coal that is used as power always after exploitation uses.Under normal conditions, coking cannot use the dross coal of high-volatile, because high-volatile can be such that coke crackle increases, lumpiness is excessively broken, and strength reduction, quality degenerates, but the low rotten dross coal ash A that is produced from refreshing mansion⁸< 6%, sulfur S⁹< 0.5, belong to low ash, low-sulfur coal, and rich reserves, the effect to the property of incoherence bituminous coal and in coal blending, deep, careful research is carried out, work achieves gratifying result, therefore the Xin Meiyuan for developing coal-blending coking, is the purpose of the present invention to obtain the high grade coke of low ash part.Experiment, research are carried out by the mechanism that the low rotten dross coal hereinafter referred to as shenfu coal produced to refreshing mansion participates in coal-blending coking, it is found that the coal characteristic of shenfu coal is: fugitive constituent is up to V^r=36~40, remove bottle coal V^rOutside > 37, the fugitive constituent of remaining coal is all between 10~37；It 2 is that degree of metamorphism is low, average maximum reflectivity R_maxBetween 0.42~0.60, former coking coal is averaged maximum reflectivity R_maxIt is most of between 0.9~1.30 between 0.64~1.43；It 3 is no caking property, and bonding index is 0~1, and former coking coal has caking property, and all greater than 20, pass through the research to its coking property confirms caking index:

Shenfu coal plays simple thinization in coal-blending coking, does not increase coke crackle because of its fugitive constituent height, can reduce coke crackle on the contrary.This can be explained from the pyrolysis state of coal；Measure the maximum weight loss rate of different coals, when temperature, several shenfu coals are at 490 DEG C or so, and other several coking coals are all in 600 DEG C or more (such as T=615 DEG C of government's banks, three give T=670 DEG C, T=600 DEG C of the village Fan Ge), thus proving shenfu coal, fugitive constituent evolution temperature is about 100 DEG C lower than binding coal during heating, this explanation is when binding coal heats cracking emergent gas, fugitive constituent has been precipitated in shenfu coal already, substantially with the presence of semicoke inert material, reduce the shrinkage stress of binding coal, reduce coke crackle, play the role of thinization, coal-blending coking, which can be participated in, for low rotten dross coal provides theoretical foundation.

Low rotten dross coal and binding coal are cooperated again, measure the variation of its caking index, and it makes comparisons with anthracite, it is generally acknowledged that anthracite does not have adhesion component in coal blending, only fibrous component, and shenfu coal is as anthracite, there is no adhesion component, only fibrous component and to the viscosity reduction of binding coal effect be greater than bituminous coal, this illustrates that the dosage of shenfu coal is very limited, as long as basic coal has enough caking property, in the substantially immovable situation of former coke making process, it can be incorporated in production coal low rotten, dross coal replaces the clean fine coal of existing coking, as long as the burden control of shenfu coal is below 10%.

The invention has the advantages that

1, since shenfu coal has the characteristics of low ash, low-sulfur, under conditions of guaranteeing coke strenth, that is, crushing strength M₄₀> 72, abrasion resistance M₁₀< 10, supplying part shenfu coal replace the clean fine coal of former coking charcoal, and the charred ashes part produced is equivalent to one or two grade, to substantially increase coke quality than existing goods charred ashes part decline 0.5~0.8.

2, simple process, cost reduces, and in the substantially immovable situation of former coke making process, the shenfu coal below of supplying 10% replaces the clean fine coal of former coking in production coal, not only reduces as-fired coal cost, the high grade coke of low ash part also can be obtained,

3, every drop level-one (0.5) coke quality of commodity charred ashes part just improves level-one, and price just increases by 3%；Abrasion resistance M₁₀Coke quality also improves level-one when every reduction 1, and price can increase by 2%, it is clear that is of great importance to the economic benefit for improving coke-oven plant.

4, precedent of the low rotten dross coal for coal-blending coking has been started, the range for expanding coal for coking, makes shenfu coal not be only used as thermal coal, may further be used to coal-blending coking, for the reasonable using opened up a new way of shenfu coal from now on, the utility value of china natural resources is improved.

The present invention will be described in further detail with reference to the examples below:

Example 1, the coking test for being incorporated 10% shenfu coal:

Coke making and coal blending ratio are as follows: bottle coal 25%, rich coal 20%, coking coal 35%, lean coal 10%, shenfu coal 10%, and original production blending ratio are as follows: bottle coal 25%, rich coal 27%, coking coal 30%, lean coal 15%, clean fine coal 3%, test result shows the (M under the preceding topic for guaranteeing coke strenth₄₀> 72, M₁₀< 10), coke ash can be down to 12.61~13.88%, than existing production coke ash decline 0.5~0.8, by in 1988 calculation of price: one ton existing 230 yuan of production coke price, one ton of low ash coke price 230 (1+3%)=236.90 yuan, low ash coke per ton increases sales volume 236.9-230=6.90 member, consider other related factors, the pure increase income of one ton of low ash coke of every production is 5.36 yuan, after being incorporated 10% shenfu coal, coke quality is not only increased, and improves economic benefit.

Example 2,5% shenfu coal of supplying are compared with being unworthy of shenfu coal:

Coal	Ash A₈	Sulfur S⁹	Crushing strength M₄₀	Wear-resistant strength M₁₀
Coal	Ash A₈	Sulfur S⁹	Crushing strength M₄₀	Wear-resistant strength M₁₀	With 5% shenfu coal	13.42	0.70	81.30	5.90
It is unworthy of shenfu coal	14.01	0.72	82.50	7.43	With 5% shenfu coal	13.42	0.70	81.30	5.90
It is unworthy of shenfu coal	14.01	0.72	82.50	7.43	Compare	0.59 Quality advance, one pole drops	0.02 same rank drops	Drop 1.2 belongs to same rank	It drops 1.53 matter and improves level-one

After being incorporated 5% shenfu coal as seen from the above table, coke ash is down to 13.50 hereinafter, Quality advance level-one, sulfur is constant, the wear-resistant strength M of coke₁₀It makes moderate progress, M₁₀Reduce 1, coke quality improves level-one, when coke average price is 197.41 yuan, it is incorporated Quality advance level-one after 5% shenfu coal, price increases by 3%, low ash coke per ton can increase: 197.41 × 3%=5.92 member, if considering other factors, the pure increase sales volume of one ton of coke is 4.19 yuan, it is incorporated the high grade coke of 10% available low ash part of shenfu coal coking below in summary, the range of coal for coking is expanded, low rotten dross coal is produced reasonably to develop and use the stable refreshing mansion of rich reserves, coal quality from now on, creates the road Liao Yitiaoxin.

Claims

1, a kind of blending method of coking, when coking by coke oven, in addition to supplying bottle coal, rich coal, coking coal, lean coal, it is characterised in that the low rotten dross coal of supplying replaces the clean fine coal of existing coking.

2, a kind of blending method of coking as described in claim 1, it is characterised in that the proportion of the low rotten dross coal with the production of superb mansion is 10% or less.