RU2533482C1 - Method of forecast of explosion hazard of methane dust mixes during coal destruction - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method of forecast of explosion hazard of firedamps during coal destruction is offered which comprises the determination of methane content of unworked coal, yield of amount of volatile substances, microcomponents of petrographic composition of coal and mineral admixtures in it, measuring of specific dust suppression and identification of criterion of dust explosivity. Meanwhile in coal beds of a mine field the sections with inclusions of pyrite are identified alongside with determination of methane content of unworked coal, volatile content of matters and content of fine dispersed dust of pyrite, parent dust in pores of coal and volumes of free coal fragments of the dust capable at coal destruction to pass into suspended state in a mine air. The quantitative connection between methane content of unworked coal and specific dust emission in the zone of coal destruction by machine cutting head is established. Besides, the offered method envisions the determination in the zone of coal destruction of methane concentration of and the content of fine dispersed dust of pyrite, thermal disintegration of which results in emission of hydrogen sulphide, which decrease the burning point of methane dust air mixes, and also the establishing of quantitative connection between the criterion of dust explosivity and petrographic differentials of coal bed.

EFFECT: improvement of reliability of the forecast of explosion hazard of methane dust air mixes.

3 cl

Description

The invention relates to mining, mainly to the coal industry, and can be used to predict explosive methane-dust mixtures in the destruction of coal by executive bodies of combines.

A known method for predicting the explosiveness of methane-dust mixtures, including measuring the yield of dust fractions with various carbon-destroying screws of coal combines, determining the specific dust emission depending on the yield of volatile substances and methane content of coal seams. (Problems of ensuring high productivity of mines in methane-rich mines / A.D. Ruban, V. B. Artemyev, B. C. Zaburdyaev et al. - M .: URAN IPKON RAS, 2009. - 396 p.).

The disadvantage of this method is that it does not take into account the content of petrographic differences in coal seams and mineral impurities, the establishment of a lower explosive limit of coal dust and the effect of pyrite dust on reducing the explosive temperature of mine dust.

A known method for predicting the explosiveness of methane-dust mixtures in coal mines, including determining the methane content of coal seams, the output of volatile substances, microcomponents of the petrographic composition of coal and mineral impurities in it, measuring the specific dust emission during operation of a coal processor and setting the criterion of dust explosibility. (Methodological foundations for the design of degassing in existing and liquidated mines / BC Zaburdyaev, A.D. Ruban, G.S. Zaburdyaev, etc. - M .: NSC GP-IHD named after A.A. Skochinsky, 2002. - 316 p. )

The disadvantage of this method is that sections of the coal seam containing pyrite inclusions are not detected, they do not determine the content of maternal dust in the pores of coal as the most finely dispersed and capable of exploding under certain temperature conditions.

The closest method for predicting the explosiveness of methane-dust mixtures during coal destruction is the known method, which includes determining the methane content of the coal mass, the yield of volatile substances, the microcomponents of the petrographic composition of coal and mineral impurities in it, measuring the specific dust emission and determining the effect of fine pyrite dust on the explosibility of coal dust (Geotechnological problems development of gas and dust hazardous coal seams / A.D. Ruban, G.S. Zaburdyaev, BC Zaburdyaev. a comprehensive development of the bowels of the Russian Academy of Sciences. - M .: Nauka, 2007. - 279 p., prototype).

The disadvantages of this method are that it does not take into account the most dangerous sections of the coal seam with pyrite inclusions, the content of maternal dust in the pores of coal and the amount of free coal dust particles capable of becoming suspended in the mine air when coal is destroyed.

The aim of the invention is to increase the reliability of the forecast of the explosiveness of methane-dust mixtures in coal mines especially hazardous for methane and dust, where pyrite inclusions are present in coal seams in the mining areas, which, when thermally decomposed, releases hydrogen sulfide and reduces the ignition temperature of hybrid mixtures of methane, coal and pyrite dust, which complicates the safety of mining operations by gas and dust factors.

This goal is achieved by the fact that the method for predicting the explosiveness of methane-dust mixtures during coal destruction in mines includes the allocation of sections with pyrite inclusions in coal seams of the mine field, determining the methane content of the coal mass, the yield of the amount of volatile substances, microcomponents of the petrographic composition of coal and mineral impurities in it, determining the content of maternal dust in the pores of coal and the volume of free coal dust particles capable of passing into a suspended state in the ore during the destruction of coal air-screw, measuring the proportion of dust and dust explosion determination criterion.

At the same time, a quantitative relationship is established between the methane content of the coal mass and specific dust emission in the zone of coal destruction by the executive body of the machine. In the zone of coal destruction, the methane concentration and the content of fine dust of coal and pyrite are determined, which reduce the ignition temperature of the hybrid mixtures. Establish a quantitative relationship between the lower explosive limit of dust and the petrographic differences of the coal seam.

The method is as follows.

On the mine field, sections of a coal seam with pyrite inclusions are identified, the methane content of the coal mass, the mineral-petrographic composition of coal and the amount of volatile substances are determined, the specific dust emission during operation of the coal-destroying executive body of the combine is determined, the content of mother dust in the pores and cracks of coal and the volume of free coal are determined dust particles capable of under the destruction of coal to become suspended in the mine air.

In addition, a relationship is established between the methane content of the coal mass and specific dust emission in the coal destruction zone, where the methane concentration and the content of fine dust of coal and pyrite are determined, the presence of which during thermal decomposition contributes to the release of hydrogen sulfide and a decrease in the ignition temperature of hybrid gas mixtures. A quantitative relationship is also established between the lower explosive limit of dust and the petrographic differences of the coal seam.

All the above measurements and determination of the parameters of methane-dust mixtures, the explosive conditions of hybrid mixtures, the yield of volatiles and the mineral-petrographic composition of coal, including its methane content and specific dust emission, are carried out in accordance with the recommendations of regulatory and methodological documents in the field of mine aerology and petrography.

Experimental data on the study of the effect of the release of volatile substances from coal and petrographic differences (microcomponents) of the Kuzbass beds indicate that the criterion of explosiveness of dusty air mixtures when mining coal seams with different material and petrographic compositions is determined by the formula

, $$P_R=\frac{V^{daf}(v_t+L)}{A^c(F+M)}$$

,

where P _p is the criterion (indicator) of the danger of ignition of methane-dust mixtures in coal mines during the destruction of coal by the executive body of the combine;

V ^daf is the yield of volatile substances from coal,%;

V _t - content in the coal of microcomponents of the vitrinite group,%;

L is the content in the coal of microcomponents of leuptinitis,%;

F — content in the coal of microcomponents of fusinite groups,%;

M - coal content of mineral impurities,%;

And ^with - the ash content of coal seams,%.

The indicator P _p in the studied conditions varies from 2 to 7.

It has been established that the dust content in the broken coal is linear in relation to the methane content of the coal seam, and with an increase in the methane content of the formation, the dust content in the destructible coal increases, and explosions of coal dust are usually preceded by methane explosions and explosions.

Claims (3)

1. A method for predicting the explosiveness of methane-dust mixtures during coal destruction, including determining the methane content of a coal mass, the yield of the amount of volatile substances, microcomponents of the petrographic composition of coal and mineral impurities in it, measuring specific dust emission and establishing a dust explosive criterion, characterized in that in coal seams of a mine field areas with inclusions of pyrite are identified, the content of finely dispersed dust of pyrite, mother dust in the pores of coal, and the volumes of free coal dust particles capable of becoming suspended in the mine air during coal decomposition, and a quantitative relationship is established between the methane content of the coal mass and specific dust emission in the zone of coal destruction by the executive body of the machine. 2. The method according to claim 1, characterized in that in the zone of destruction of coal determine the concentration of methane and the content of fine dust of pyrite, reducing the ignition temperature of the hybrid mixtures. 3. The method according to claims 1 and 2, characterized in that a quantitative relationship is established between the dust explosive criterion and the petrographic differences of the coal seam.