Causes and detection of coalfield fires, control techniques, and heat energy recovery: A review

Su, Haijun; Zhou, Fang; Shi, Bobo; Han, Qing; Deng, Jinchang

doi:10.1007/s12613-019-1947-x

Cited by 37 publications

(16 citation statements)

References 134 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relationship between the heat release rate and the reaction rate constant is approximately as Eq. (7).…”

Section: 3mentioning

confidence: 99%

“…Coal eld res triggered by spontaneous coal combustion also occur continuously when mining, and are considered a global crisis, which not only causes serious environmental destruction and loss of coal resources, but also poses a serious threat to human safety and health. [4][5][6][7]. Most coal eld res occur in an oxygen-lean (oxygen concentration lower than air) and multigas environment due to insu cient oxygen supply and combustion product gases [8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

View full text Add to dashboard Cite

Coal combustion in an oxygen-lean and multi-gas environment is a common exothermic phenomenon for coalfield fires, leading to serious environmental destruction and loss of coal resources. Simultaneous thermal analysis experiments for Bulianta (BLT, high-volatile bituminous coal) and Yuwu coal (YW, anthracite) in 21vol.%O2/79vol.%N2 and 15vol.%O2/5vol.%CO2/80vol.%N2 were carried out to study the law of heat release. Based on the TG-DTG-DSC curves, the combustion characteristic parameters were analyzed. A delay of ignition and heat release existed during the coal oxygen-lean combustion in O2/CO2/N2. Decreasing O2 concentration caused a significant reduction of local reactivity and further the decreasing maximum heat release rate for low-rank coal, while increasing CO2 concentration caused a significant thermal lag effect and further the increasing maximum heat release rate for high-rank coal. The relationship between the heat release rate and the reaction rate constant was quantitatively analyzed. At the increasing stage of the heat release rate, the heat release rate of the two coals increased conforming to ExpGro1 exponential model. At the decreasing stage of the heat release rate, the heat release rate of YW coal decreased exponentially with the reaction rate constant, while the heat release rate of BLT coal decreased linearly. Regardless of the atmospheres, the conversion rates corresponding to maximum heat release rate of BLT and YW coal were about 0.80 and 0.50, respectively, indicating that the coal rank played a dominant role. The results are helpful to understand the heat release process of coal oxygen-lean combustion in O2/CO2/N2.

show abstract

“…The relationship between the heat release rate and the reaction rate constant is approximately as Eq. (7).…”

Section: 3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Worldwide, coal fires with a large area, a high temperature, and a long duration occur frequently in exposed or underground coal seams [1]. In many countries, such as China [2,3], South Africa [4], India [5], USA [6] and Australia [7], coal fires cause major disaster during opencast working. Domestic and international research on coal fires primarily include the following aspects: the distribution and development of coal fires, the detection and monitoring of coal fires [8][9][10], the modelling of underground coal fires [11][12][13], assessments of the impact on the environment and human health [14] and fire-fighting engineering [15,16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Performance of a Novel Unidirectional Explosive Element and an Explosive Logic Network

Wang

Shen

2022

Energies

View full text Add to dashboard Cite

Considering the unsafety of the present blasting network used in the blasting mining of coalfield fires, a unidirectional explosive element (named explosive diode) is proposed according to explosive logic element principles. Through theoretical and experimental analysis, the internal structure and mechanism of the unidirectional transmission of the detonation signal were studied. For an explosive diode, the length of the quenching channel was defined to be the key parameter. The explosive diode was implemented in the traditional blasting network, obtaining an explosive logic network. To evaluate the safety and reliability of the explosive diode and explosive logic network, detonation propagation and explosion-proof experiments were conducted in the lab. The optimum length of the quenching channel to obtain unidirectional detonation transmission was established. The results showed that the explosive diode could reliably control the propagation direction of the detonation signal when the length of the quenching channel was between 15 mm and 25 mm. The explosive logic network achieved a reliable detonation propagation and was explosion-proof. In comparison with traditional networks, the explosive logic network showed increased safety and reliability as the number of subnets increased. This is a significant improvement to mining safety and demonstrates great promise for engineering applications.

show abstract

“…If the external conditions result in destroying the heat-storage capacity of the coal body during this process, coal cooling is promoted, resulting in “oxidized coal” formation. The problem of spontaneous combustion of oxidized coal is common in the process of coal mining and utilization such as mining or re-mining of the residual coal in the goaf; , after anaerobic cooling in the closed fire zone, , after the coalfield fire area is extinguished, around the burning area; − in the process of slicing mining in thick coal seams, or for the upper-slice coal body exposed again under the influence of lower-slice mining. , Therefore, it is of great significance to study the macroscopic and microscopic characteristics of the oxidized coal spontaneous combustion process for efficient prevention of reburning of the oxidized coal.…”

Section: Introductionmentioning

confidence: 99%

Combustion Kinetics and Mechanism of Pre-Oxidized Coal with Different Oxygen Concentrations

et al. 2021

View full text Add to dashboard Cite

The phenomenon of spontaneous combustion of “oxidized coal” is common in mining processes of goafs, thick coal seams, and unsealing of closed fire areas. In order to study the reburning characteristics of coal with different oxidation degrees, the oxygen concentration in the pre-oxidation process was selected as the key influencing factor. Thermogravimetric analysis (TGA) and in situ Fourier-transform infrared (FT-IR) spectroscopy were used to study the macro- and microcharacteristics of raw and oxidized coal during the combustion stage. The results showed that the pre-oxidation treatment exhibited a dual effect on promoting and inhibiting the weight loss characteristics of oxidized coal. The apparent activation energy, E a, of the combustion reaction for the utilized coal samples was calculated using the Flynn–Wall–Ozawa (FWO) and Kissinger–Akahira–Sunose (KAS) methods, and it was found that the average apparent activation energy (E a̅) values of the oxidized coal samples were less in magnitude than that of the raw coal and that the coal sample with the pre-oxidized oxygen concentration of 15% was more prone to the combustion reaction. Using the correlation determination method of key active groups in the proposed coal combustion reaction, the key active groups affecting the weight change of the tested coal samples during the combustion stage were determined as −CH3 and C–O. The results can be helpful to prevent and control coal spontaneous combustion during re-mining and unsealing of closed fire areas.

show abstract

Causes and detection of coalfield fires, control techniques, and heat energy recovery: A review

Cited by 37 publications

References 134 publications

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Experimental Study on the Performance of a Novel Unidirectional Explosive Element and an Explosive Logic Network

Combustion Kinetics and Mechanism of Pre-Oxidized Coal with Different Oxygen Concentrations

Contact Info

Product

Resources

About