CN104102821A - Method for establishing gas coal quality evaluation model - Google Patents

Abstract

The invention discloses a method for establishing a gas coal quality evaluation model. The method comprises the following steps: 1) setting P as a gas coal quality evaluation index, and setting P=Pj+K1*(M-Mj)+K2*(N-Nj), wherein M, N, Mj and Nj respectively refer to the granular mosaic structure proportion of to-be-evaluated gas coal, the proportion sum of isotropic and inert structures of the to-be-evaluated gas coal, the granular mosaic structure proportion of standard gas coal and the proportion sum of isotropic and inert structures of the standard gas coal; K1 and K2 are constants, and are associated with the strength CSR of coke after thermal reaction by the following formula: CSR=K+K1*M+K2*N, wherein K is a constant; 2) obtaining K, K1 and K2 by substituting values of the granular mosaic structure proportions, the proportion sums of the isotropic and inert structures of three different groups of gas coal, and the strength CSR of coke after thermal reaction into the second formula in the previous step; obtaining P by substituting K1 and K2 and indexes of Mj and Nj of the standard gas coal into the first formula, wherein the greater the P value is, the better the gas coal quality is. By adopting the method, the quality of gas coal of different sources can be determined favorably, coking enterprises can use gas coal of different sources reasonably, the coke quality stability is improved favorably, and the thermal fluctuation is reduced.

Description

Set up the method for bottle coal coal property evaluation model

Technical field

The invention belongs to technical field of coal chemical industry, be specifically related to a kind of method of setting up bottle coal coal property evaluation model.

Background technology

China's bottle coal aboundresources, it is over half that bottle coal and 1/3 coking coal reserves account for Chinese coking coal reserves, and strong cohesiveness rich coal is relative with coking coal resource less, is good utilisation bottle coal resource more, need deepen understanding to bottle coal ature of coal.According to GB5751-2009 < < China coking coal classification > > national standard, bottle coal can divide bottle coal 34#, 43#, 44#, tetra-trades mark of 45#, mainly with volatile matter and G value, distinguish, volatile matter >28.0～37.0, G value >50～65, for bottle coal 34#, volatile matter >37.0%, G value >35, is respectively bottle coal 43#, 44#, 45#.From grade of coal index, can find out, different trade mark bottle coal volatile matters and G value differ greatly, and volatile matter and G value can only characterize the appearance features of bottle coal in addition, cannot contact directly with Thermal Properties of Coke, can not better instruct the adapted of different ature of coal bottle coals.

Summary of the invention

The object of the present invention is to provide a kind of dry basis ash content≤9.00% of setting up, the method of the bottle coal coal property evaluation model of sulphur content≤0.6%, the method is according to the percentage contribution of different quality index STRENGTH ON COKE thermal behavior, determine its weight, the relative superior or inferior degree of quantitatively evaluating separate sources bottle coal quality, both contributed to, according to separate sources bottle coal ature of coal rational evaluation and use, to contribute to again Rational Utilization of Coking Coal.

For achieving the above object, method of the present invention comprises the steps:

1) detect the ature of coal key index of bottle coal, draw its granular mosaic texture ratio M (unit is %), the same sex and inertia structure proportion sum N (unit is %);

2) setting P (unit is %) is bottle coal coal property evaluation index, and order:

P＝P _j+K ₁×(M-M _j)+K ₂×(N-N _j) (1)

P wherein _jfor the coal property evaluation index of benchmark bottle coal, M _j, N _jbe respectively granular mosaic texture ratio, the same sex and the inertia structure proportion sum of benchmark bottle coal; K ₁, K ₂for constant, represent to evaluate the weight of the factor, and be associated by following relational expression with intensity CSR after coke thermal response (unit is %):

CSR＝K+K ₁×M+K ₂×N (2)

Wherein K is constant;

3) by by the numerical value substitution formula (2) of intensity CSR after granular mosaic texture ratio, the same sex and the inertia structure proportion sum of three groups of different bottle coals and coke thermal response, obtain K, K ₁, K ₂; By K ₁, K ₂m with benchmark bottle coal _j, N _jindex substitution formula (1), obtains bottle coal coal property evaluation indices P, and P value is larger, represents that bottle coal ature of coal is better.

The present invention has following beneficial effect:

(1) the present invention is defined as the granular mosaic texture ratio of bottle coal, the same sex and inertia structure proportion sum to evaluate the key index of bottle coal quality, draws the related coefficient of each evaluation index, defines the good and bad degree of separate sources bottle coal;

(2) be of value to the Reasonable Orientation of purchasing department to separate sources bottle coal price;

(3) be of value to coal chemical enterprise to separate sources bottle coal Reasonable use, be beneficial to coke quality steady and improve, reduce thermal behavior fluctuating range.

Embodiment

Below in conjunction with embodiment, the present invention is further detailed explanation.

Certain enterprise's bottle coal proportioning is 40%, dry basis ash content≤9.00% of described bottle coal, and sulphur content≤0.6%, its Coal Blending Schemes is specially:

Bottle coal: 40%; Rich coal: 20%; Coking coal 1#:40%.G value >=85 of described coking coal 1#, coking coarse grain mosaic texture ratio >=60%.

Rich coal, coking coal remain unchanged, get three groups of different bottle coals of enterprise, according to said ratio, carry out coal-blending coking, obtain intensity after coke thermal response, detect the ature of coal key index of these three groups of bottle coals, draw its granular mosaic texture ratio M, the same sex and inertia structure proportion sum N.Each related data is in Table 1.

The different bottle coals of table 1 carry out intensity after the thermal response of coke after coal blending

Coal sample	Vdaf	G	X/％	Y/％	CSR/％
						Bottle coal 1#	37.82	80	76	24	68.47
Bottle coal 2#	37.66	81	46	54	57.24
						Bottle coal 3#	36.17	55	12	88	47.99

By each data substitution formula (2) of table 1, draw respectively K, K ₁and K ₂for: 61.11,0.123 ,-0.17.

Obtain: CSR=61.11+0.123M-0.170 * N.

Select three kinds of different bottle coals can make K, K ₁and K ₂slightly different, but these differences can't change the relative order of bottle coal being carried out to coal property evaluation.

This enterprise newly buys certain ore deposit point different batches bottle coal, and the coal analysis of each bottle coal the results are shown in Table 2.

Table 2 coal analysis result

These 4 bottle coals are according to current domestic evaluation criterion: by domestic evaluation criterion at present, bottle coal 5# ature of coal is optimum, is secondly bottle coal 4#, follows by bottle coal 7#, and worst is bottle coal 6#.In addition, the numerical value of the granular mosaic texture ratio M of these 4 separate sources bottle coals, the same sex and inertia structure proportion sum N is in Table 3.

The table 3 bottle coal coal property evaluation factor and evaluation number

Coal sample	M/％	N/％	P/％
				Bottle coal 4#	75	25	66

Bottle coal 5#	64	36	63
				Bottle coal 6#	30	70	52
Bottle coal 7#	25	75	51

Take granular mosaic texture ratio M as 65%, the same sex and inertia structure proportion sum N be 30% bottle coal is benchmark bottle coal, its evaluation number is set as 64,, by related data substitution formula (1), the coal property evaluation indices P of trying to achieve respectively these 4 bottle coals is: 66,63,52,51.The coal sample 5# evaluation number that coal sample 4# that G value is low is higher than G value is high, and coal sample 5# marks higher than benchmark sample, and the comparable benchmark sample of its adapted amount is high, and coal sample 4# adapted amount is a little less than benchmark sample; The coal sample 6# that G value is low is lower than coal sample 7# evaluation number, and lower than in benchmark sample, in coal blending, adapted amount should be lower than benchmark sample.

Above 4 kinds of bottle coals are carried out respectively to coal-blending coking, and its gained Thermal Properties of Coke is in Table 4.

Intensity (CSR/%) after three kinds of bottle coals participation coal-blending coking gained coke thermal responses of table 4

In table 4, scheme 1: bottle coal: 40%; Rich coal: 20%; Coking coal 1#:40%.

Scheme 2: bottle coal: 10%; 1/3 coking coal: 20%; Rich coal: 15%; Coking coal 1#:20%; Coking coal 2# (85>G value >=80): 20%; Lean coal: 15%.

Wherein coking coal 1#, coking coal 2# in embodiment 1～6, lean coal, 1/3 coking coal, rich coal are all identical; Its relevant coal analysis the results are shown in Table 5.

Table 5 coal analysis result

As can be seen from Table 4, coal property evaluation method of the present invention can be evaluated bottle coal ature of coal well, and the ature of coal of bottle coal with this bottle coal, participate in the thermal response of coal-blending coking gained coke after intensity there is good correlativity.

Therefore, set up the rational model of bottle coal coal property evaluation, be not only conducive to determining of different ature of coal bottle coal adapted amounts, also help purchasing department and buy high performance-price ratio bottle coal.

Claims (1)

1. set up a method for bottle coal coal property evaluation model, dry basis ash content≤9.00% of described bottle coal, sulphur content≤0.6%; The method comprises the steps: 1) detect the ature of coal key index of bottle coal, draw its granular mosaic texture ratio M, the same sex and inertia structure proportion sum N;

2) setting P is bottle coal coal property evaluation index, and order:

P＝P _j+K ₁×(M-M _j)+K ₂×(N-N _j) (1)

P wherein _jfor the coal property evaluation index of benchmark bottle coal, M _j, N _jbe respectively granular mosaic texture ratio, the same sex and the inertia structure proportion sum of benchmark bottle coal; K ₁, K ₂for constant, represent to evaluate the weight of the factor, and be associated by following relational expression with intensity CSR after coke thermal response:

CSR＝K+K ₁×M+K ₂×N (2)

Wherein K is constant;

3) by by the numerical value substitution formula (2) of intensity CSR after granular mosaic texture ratio, the same sex and the inertia structure proportion sum of three groups of different bottle coals and coke thermal response, obtain K, K ₁, K ₂; By K ₁, K ₂m with benchmark bottle coal _j, N _jindex substitution formula (1), obtains bottle coal coal property evaluation indices P, and P value is larger, represents that bottle coal ature of coal is better.