Natural desorption of carbon monoxide during the crushing of coal simulating natural rock mass pressure

Więckowski, Marek; Howaniec, Natalia; Smoliński, Adam

doi:10.1016/j.scitotenv.2020.139639

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…CO is one of the most common indicator gases [26]. The relationship between CO production and coal temperature for the three coal samples is shown in Figure 2.…”

Section: Co Concentrationmentioning

confidence: 99%

Study on Spontaneous Combustion Characteristics and Early Warning of Coal in a Deep Mine

Wang,

Du,

Deng

et al. 2023

Fire

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Due to high stress, high ground temperature, high moisture, and other factors in deep mines, the risk of coal spontaneous combustion (CSC) is enhanced, seriously affecting the safety of coal mining. To achieve early prediction of spontaneous combustion in the No. 3 coal seam at the Juye coalfield in the deep mine, this paper employs a temperature-programmed device to analyze the changing pattern of single-index gases and composite gas indices with temperature derived from the gas produced during csc. It also optimizes the index gas of coal sample spontaneous combustion. Simultaneously, the characteristics of coal temperature and a four-level warning indicator system for CSC are determined based on the analysis of indicator gas growth rate method, carbon-to-oxygen ratio, and the characteristics of the indicator gas. The composite index gases of the No. 3 coal seam in Juye coalfield are selected in the initial oxidation stage (Rco), accelerated oxidation stage (R1, G1), intense oxidation stage (R2, G1, G3), and oxidative decomposition stage (G3). This leads to the construction of a six-level warning system consisting of initial warning value, blue, yellow, orange, red, and black levels. Meanwhile, warning thresholds are also established.

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“…CO is one of the most common indicator gases [26]. The relationship between CO production and coal temperature for the three coal samples is shown in Figure 2.…”

Section: Co Concentrationmentioning

confidence: 99%

Study on Spontaneous Combustion Characteristics and Early Warning of Coal in a Deep Mine

Wang,

Du,

Deng

et al. 2023

Fire

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“…In the study on gas release in the process of coal production higher initial amounts and rates of gas desorption were observed for fragmented coal than for the body of coal 19 . Carbon monoxide is also naturally present within the seams of coal (irrespective of coal self-ignition process) and is detected during the course of mining activities at the levels of up to several hundred ppm 20 , 21 . Fracturing of coal in the process of coal extraction may also itself release gases from coal structure with the values of carbon monoxide concentrations depending on the coal rank, the mode and depths of the exploitation as well as the type of the overlying rocks.…”

Section: Introductionmentioning

confidence: 99%

Improved method of fire hazard assessment taking into account the effect of the primary temperature of a coal seam on the desorption ratio of gas indicators

Więckowski

Howaniec

Smoliński

2022

Sci Rep

Self Cite

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The methods of fire risk assessment in its early phase employed so far used to take into account only the temperature of the heating of coal. The research works reported so far in this field have been conducted at ambient temperatures, without considering the rock mass primary temperature occurring in a particular coal seam and neglecting the depth of coal seams. The method for the determination of the composition of gases emitted from coal samples, employed in the study presented here, takes into account the effect of rock mass pressure, and therefore the depth of the coal seam, as well as the temperature typical for the rock mass in a particular coal mine. In the paper the results of the experimental research on the effects of the primary temperature of a coal seam on the content of gases emitted from coal, performed with the use of a specially designed experimental stand are presented. The method may be useful in developing fire hazard predictions for longwalls with residual coal in goafs. The relations between the self-ignition characteristics as well as selected physical properties of coal samples and carbon monoxide emission were also given. The research results proved that the accurate fire hazard assessment requires considering other than just self-heating of coal causes of carbon monoxide emission, including the rock mass primary temperature, which is expected to improve the existing methods of fire risk assessment in coal mines and post-mining areas.

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“…e laws of natural desorption of carbon monoxide during the crushing of coal simulating natural rock mass pressure were studied [8]. Low-pressure sorption tests were carried out on samples of selected Polish bituminous coal in coal-methane and coalcarbon dioxide systems, and the purpose was to determine the relationship between the petrographic composition of low-rank coal and the amount of gas stored in its porous structure and desorbed from it [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Desorption Characteristics of Coalbed Methane under Variable Loading and Temperature in Deep and High Geothermal Mine

Wang

Jia

et al. 2020

Advances in Civil Engineering

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Due to the influence of deep high stress, geothermal heat, and other factors, the law of desorption of methane in coal seams is more complicated in the process of mining deep coal seams, which is prone to methane over-limit, coal and gas outburst, and other accidents. In order to study the desorption characteristics of coalbed methane under different loading and temperature conditions, the desorption tests at different deformation stages of coal containing methane were carried out in the process of loading-adsorption-desorption-reloading until the coal sample was destroyed by using the seepage-adsorption-desorption test system on coal and rock mass, and the test programs were different combinations of gas pressure 1.2 MPa, two kinds of confining pressure, and three kinds of temperature. The results show that the cumulative methane desorption amount corresponding to each deformation stage presents a convex parabolic increase trend with the increase in desorption time, while the desorption rate presents a power function decay trend. Under the condition of the same desorption time, the cumulative methane desorption amount from large to small is residual deformation stage, compaction stage, near the peak stress, plastic deformation stage, and elastic deformation stage. Under the same confining pressure, temperature, and methane pressure, the maximum desorption rate from large to small is residual deformation stage, near the peak stress, plastic deformation stage, compaction stage, and elastic deformation stage. The desorption and diffusion of methane are promoted under the higher temperature and lower confining pressure, which presents a certain mechanism of promoting desorption. The thermal movement of methane molecules is intensified with the increase in temperature, and the adsorption effect between methane molecules and the molecules at the surface of the coal is weakened. The cumulative methane desorption amount and the maximum desorption rate increase with the increase in temperature. The cumulative methane desorption in the residual deformation stage is obviously greater than that in other deformation stages. The increase in confining pressure inhibits the development and expansion of pore fractures in raw coal specimen and hinders the increase in the effective desorption surface area. The cumulative methane desorption amount and the maximum desorption rate decrease with the increase in confining pressure.

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Natural desorption of carbon monoxide during the crushing of coal simulating natural rock mass pressure

Cited by 10 publications

References 32 publications

Study on Spontaneous Combustion Characteristics and Early Warning of Coal in a Deep Mine

Study on Spontaneous Combustion Characteristics and Early Warning of Coal in a Deep Mine

Improved method of fire hazard assessment taking into account the effect of the primary temperature of a coal seam on the desorption ratio of gas indicators

Experimental Study on Desorption Characteristics of Coalbed Methane under Variable Loading and Temperature in Deep and High Geothermal Mine

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