A lab-scale experiment on low-temperature coal oxidation in context of underground coal fires

Li, Jun; Fu, Pengbin; Zhu, Qiren; Mao, Yandong; Yang, Cheng

doi:10.1016/j.applthermaleng.2018.05.128

Cited by 35 publications

(15 citation statements)

References 28 publications

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“…This implies that at the beginning of the coal spontaneous heating the ratio of CO2/CO can reach high values, in particular for low rank coal, and, as a result of a further thermal runaway this ratio will tend to decrease to a constant value. In previous works [3,10,31], the decreasing trend of CO2/CO ratio with the increase of coal temperature was also observed.…”

Section: Gases Emission Profilementioning

confidence: 62%

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Wojtacha‐Rychter

Smoliński

2020

Materials

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The self-heating phenomenon of coal leads to work safety hazards in underground mining. The quantitative analysis of gaseous products in mine atmosphere constitutes one of the detection methods of advanced coal heating. The article presents the results of tests on CO, CO 2 , and H 2 emissions during simulated heating of coal in the temperature range of 323-523 K. The oxidation of 15 Polish coals of various carbon contents was performed using a flow reactor technique. A chromatography method was applied to measure the changes of oxidation products concentrations with the increase of temperature. It has been determined that all the tested gases were generated at the initial temperature. The collected data indicated that CO 2 was a major oxidation product in the entire temperature range, while the amounts of H 2 produced did not exceed 0.49% volume. At the temperature of 323 K, the ratio of CO 2 /CO was in the range of 10-23 but along with the temperature increase the ratio range narrowed to 3-4. In this paper, a comparison of the physical-chemical properties of the tested coals and the emissions profile of the gases using, among others, the hierarchical clustering analysis showed that samples with higher oxygen, sulfur, and inertinite content as well as lower ash and carbon content formed larger amounts of fire gases.

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Section: Gases Emission Profilementioning

confidence: 62%

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Wojtacha‐Rychter

Smoliński

2020

Materials

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“…To study the effect of four different low moisture contents on the spontaneous combustion characteristics of coals with different metamorphic grades, we conducted the temperature programmed oxidation experiment [30]. Figure 4 shows the change of oxygen consumption of four different metamorphic grade coals at four different low moisture contents during the temperature programmed oxidation process.…”

Section: Analysis Of Temperature Programmed Oxidation Experimental Rementioning

confidence: 99%

Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC

2019

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In the environments of various open coal storage sites, mining-affected coalbeds, and goafs, etc., some coal bodies are often affected by external environmental factors. They are highly prone to spontaneous combustion in low moisture content (≤8%). In order to examine the effect of low moisture content on the spontaneous combustion tendency of coals with different metamorphic grade, we conducted a temperature programmed oxidation (TPO) experiment and differential scanning calorimetry (DSC) experiment to study the spontaneous combustion characteristics of coals with different metamorphic grade at four different low moisture contents. The change laws of the characteristic parameters of four different metamorphic grade coals at four different low moisture contents were comparatively analyzed. The experimental results indicate that: (1) Compared other low moisture content, anthracite and fat coal at a low moisture content of 1.2 % show a stronger tendency for spontaneous combustion, and long flame coal and lignite at a low moisture content of 3.4% and 5.6% are more prone to spontaneous combustion. (2) Four different metamorphic grade coals at a low moisture content of 7.8% are less prone to spontaneous combustion.

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“…To study the effect of four different low moisture content on the spontaneous combustion characteristics of coals with different metamorphic grade, we conducted the temperature programmed oxidation experiment [30]. Figure 4 shows the change of oxygen consumption of four different metamorphic grade coals at four different low moisture content during the temperature programmed oxidation process.…”

Section: Analysis Of Temperature Programmed Oxidation Experimental Rementioning

confidence: 99%

Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC

Fan¹,

Wang²,

Zhang³

2019

Preprint

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In the environments of all kinds open coal storage sites , mining-affected coalbeds, and goafs, parts of coal body at low moisture content (≤8%) are prone to spontaneous combustion under the influence of some external environmental factors. In order to examine the influence effect of low moisture content on the spontaneous combustion tendency of coals with different metamorphic grade, we conducted temperature programmed oxidation (TPO) experiment and differential scanning calorimetry (DSC) experiment to study the spontaneous combustion characteristics of coals with different metamorphic grade at four different low moisture content, and comparatively analyzed the change laws of the characteristic parameters of four different metamorphic grade coals at four different low moisture content. The experimental results indicate that: 1) Compared other low moisture content, anthracite and fat coal at low moisture content of 1.2% show stronger tendency to undergo spontaneous combustion, long flame coal and lignite at low moisture content of 3.4% and 5.6% are more prone to spontaneous combustion. 2) Four different metamorphic grade coals at low moisture content of 7.8% are less prone to spontaneous combustion; 3) Coals with different metamorphic grade have different tendency to undergo spontaneous combustion.

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A lab-scale experiment on low-temperature coal oxidation in context of underground coal fires

Cited by 35 publications

References 28 publications

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Profile of CO2, CO, and H2 Emissions from Thermal Oxidation of Polish Coals

Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC

Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC

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