CN1214452A - Determination of float-and-sink composition of coal based on its ash content - Google Patents

Abstract

The method to replace the float-and-sink test can determine the floated and sunk composition of coal according to the ash content and available float-and-sink data. According to the available data of the same mining area, are set the regression equation of ash content of coal and its accumulative 1.4,1.5,1.6 and 1.8 density level suspension yields and the monadic quadratic regression equation of the elementary ash content and the density. During determination of float-and-sink composition of coal substituting the ash content into the regression equation finds out the accumulative 1.4,1.5,1.6 and 1.8 density level suspension yields; and integrating on the elementary ash content-density equation finds out the average ash contents of various density levels.

Description

Determine the composition that drifts along of coal according to the ash content of coal

The present invention relates to the method that a kind of ash content according to coal determines that drifting along of coal formed, this is a kind of method that replaces the coal float-and-sink analysis, the composition that drifts along that this method can be determined coal fast according to the ash content and the historical float-and-sink analysis data of coal.

As everyone knows, must carry out the composition that drifts along that float-and-sink analysis could be understood coal at present, float-and-sink analysis need expend great amount of manpower and material resources, and needs just can finish at least in several hours, can not adapt to the needs of automatic control; Design or often lack the float-and-sink analysis data when predicting, unconditionally take coal sample to carry out float-and-sink analysis again.But the ash rate of raw coal is easier to obtain.

The objective of the invention is to propose a kind of method of drifting along and forming that a kind of ash content according to coal is determined coal that relates to, this is a kind of method that replaces the coal float-and-sink analysis, and this method can be determined the composition that drifts along of coal fast according to the ash content of coal and historical float-and-sink analysis data.

The present invention is the composition that drifts along of determining coal according to the ash content of coal, and realizes as follows: the historical summary of coal float-and-sink analysis of collecting identical mining area is more than eight parts:

Determine the floating accumulative total productive rate of-1.4 ,-1.5 ,-1.6 ,-1.8 densimetric fractions and the regression equation of coal ash relation with the simple linear regression analysis method:

R _i=A _i+B _iASH???······??(1)

In the formula: i=1.4,1.5,1.6,1.8; R _iBe floating thing accumulative total productive rate; ASH is a coal ash; A _i, B _iBe parameter, try to achieve with regression analysis by historical summary.

Try to achieve the mathematical model that cumulative float curve is density-floating thing accumulative total productive rate relation with the nonlinear fitting method:

R=f(X)······(2)

The floating thing accumulative total of R-productive rate, X-density.Determine the relation of elementary ash λ and raw coal density with the One-place 2-th Order regression analysis:

λ=C+DX+EX ²······(2)

In the formula: λ is an elementary ash; X is a density; C, D, E is a parameter, is tried to achieve by regretional analysis side by historical summary.

Try to achieve the average ash content of each densimetric fraction with integral method: $A=\frac{{\∫}_{d1}^{d2}f\left(X\right)\mathrm{\λ}}{{\∫}_{d1}^{d2}f\left(x\right)}----\left(3\right)$

D1, d2 are the bound of density.

So far, finish determining that coal drifts along and forms.

The present invention has following advantage compared with the prior art: in the time can't testing, can determine the composition that drifts along of coal according to historical summary, for design provides foundation with controlling automatically.Do not test, obtain raw coal float-and-sink analysis data fast, use manpower and material resources sparingly.

Use that the present invention forms the density of 75 fens data of six factories of China and coal ash concern that result of study is as shown in table 1.As shown in Table 1, the related coefficient of-1.4 densimetric fraction content and coal ash is 0.88 ,-1.5, and-1.6 and-1.8 related coefficient is 0.98-0.99.Table 2 is six factory's elementary ashes-density regretional analysis result, and the facies relationship number average is greater than 0.99.Table 3 is that accuracy of predicting is gratifying to Xingtai coal preparation plant and the prosperous village coal preparation plant's measured result and the contrast that predicts the outcome.

Table 1 coal ash-floating thing accumulative total productive rate regretional analysis result

Density	The data umber	The regretional analysis result
					????A	????B	Related coefficient
		????-1.4	????75	????87.6583				????-1.08637	????0.88
????-1.5	????75				????102.9435	????-1.26965	????0.98
		????-1.6	????75	????107.25422				????-1.27056	????0.99
????-1.8	????75				????110.16179	????-1.22630	????0.99

Six factory's elementary ashes of table 2-density regretional analysis result

Factory's name	The data umber	The regretional analysis result
						????C	????D	????E	Related coefficient
		Dragon and phoenix	????16	??-289.3714	??332.59464					??-81.05357	????0.999
Big village	????12					??-152.3331	??141.06643	??-15.96428	????0.997
		Xingtai	????16	??-218.7614	??241.12143					??-53.35714	????0.998
The Huaibei	????9					??-226.2877	??241.84179	??-50.41071	????0.999
		East is huge	????11	??-59.71514	??17.217143					??24.714286	????0.994
The prosperous village	????12					??-224.6771	??241.51607	??-50.55357	????0.995

Table 3 measured result and the contrast that predicts the outcome

Factory's name	Density	Measured result		Prediction	The result
						Productive rate %	Ash content %	Productive rate %	Ash content %
		Xingtai coal preparation plant	?-1.4	????57.76	????6.57					????57.88	????6.13
?1.4-1.5	????9.12					????15.77	????8.99	????15.54
			?1.5-1.6	????3.76	????23.56				????3.40	????23.13
?1.6-1.8	????3.10					????35.10	????3.07	????34.91
			????+1.8	????26.26	????80.08				????26.66	????80.33
Add up to	??100.00					????28.22	???100.00	????28.22
			Prosperity village coal preparation plant	?-1.4	???70.65				????6.41	????70.81	????6.69
?1.4-1.5	???11.07	????16.78				????11.26	????16.69
				?1.5-1.6	?????3.94			????25.79	????3.58	????25.36
?1.6-1.8	?????2.98	????39.39				????3.23	????38.92
				????+1.8	?????11.36			????86.25	????11.12	????86.32
Add up to	????100.00	????18.38				????100.00	????18.38

Above-mentioned result of study shows, the present invention is according to the historical summary of coal float-and-sink analysis, is feasible according to the ash content prediction coal of the coal method of forming of drifting along, and its precision of prediction is higher.Do not satisfying the requirements when carrying out float-and-sink analysis, can determine the composition that drifts along of coal fast, general Practical significance is being arranged.

Claims (4)

1, a kind of ash content according to coal is determined the method that coal drifts along and forms, this is a kind of method that replaces the coal float-and-sink analysis, characteristics of the present invention are not make float-and-sink analysis, determine the composition that drifts along of coal fast according to the ash content and the historical float-and-sink analysis data of coal.

2, determine the method that coal drifts along and forms according to claim 1 described ash content according to coal, its characteristics are and need predict according to a large amount of historical summaries of identical mining area coal float-and-sink analysis.

3, determine the method that coal drifts along and forms according to claim 1,2 described ash contents according to coal, its characteristics are to try to achieve according to historical summary the regression equation of the floating thing accumulative total productive rate of coal ash and-1.4 ,-1.5 ,-1.6 and-1.8 densimetric fractions, and ash content of coal substitution regression equation is tried to achieve the floating thing accumulative total of-1.4 ,-1.5 ,-1.6 and 1.8 densimetric fractions productive rate.

4, determine the method for drifting along and forming of coal according to claim 1,2 described ash contents according to coal, its characteristics are to try to achieve the One-place 2-th Order regression equation of elementary ash with density according to historical summary, to elementary ash one density equation integration, try to achieve the average ash content of each densimetric fraction.