Abstract
With the expansion of the scale of coal mining, the safety problems caused by the reburning of coal are becoming more and more serious. In this paper, the pyrolysis characteristics of gas coal and the exothermic characteristics of reoxidation of residues were studied by using a synchronous thermal analyzer. The functional groups of pyrolysis residues were tested, and the group content and characteristic structural parameters were calculated based on quantum chemistry method. The results show that with the increase of pyrolysis temperature, Volatile maximum separation rate (Vmax) and the change in the residual weight of the coal sample (ΔWvp) increase. The increase of temperature will lead to the decrease of hydroxyl and aliphatic hydrocarbon content in coal, and the increase of aromatic hydrocarbon. With the deepening of pyrolysis, the ignition point temperature of coal samples decreases first and then rises, the combustion intensity and combustion concentration are strengthened. The pyrolysis results show that 462.8°C is the critical temperature for the transition during pyrolysis. The ignition point of the residue is less affected by the pyrolysis conditions, and the ignition temperature of the raw coal and the pyrolysis residue varies within 330.57°C–334.98°C.
Highlights
IntroductionCoal field fire burned a large amount of coal resources (Cheng et al, 2021; Shen and Zeng, 2021; Zhang et al, 2020d; Zheng et al, 2020b), indirectly caused tens of times of the stagnant resources unexploited, produced a large number of greenhouse gases and toxic and harmful substances seriously harm the local ecological environment and groundwater resources (Zhang et al, 2004, 2020c; Zhong and Hu, 2008, Zhong et al, 2008)
This paper studied the pyrolysis characteristics of DLT gas coal at 350C, 400C, 450C and 500C, and analyzed the heat release rule in the reoxidation process of the pyrolysis residue
Raw coal and its residues at different pyrolysis temperatures were analyzed by infrared spectroscopy
Summary
Coal field fire burned a large amount of coal resources (Cheng et al, 2021; Shen and Zeng, 2021; Zhang et al, 2020d; Zheng et al, 2020b), indirectly caused tens of times of the stagnant resources unexploited, produced a large number of greenhouse gases and toxic and harmful substances seriously harm the local ecological environment and groundwater resources (Zhang et al, 2004, 2020c; Zhong and Hu, 2008, Zhong et al, 2008). With the progress of strip mining, the oxidation area has been continuously exposed, and a large amount of pyrolysis residual coal has been exposed to air and reburning, resulting in a large area of oxidation high temperature zone and open flame (Figure 1), which destroys the surrounding ecology environment, and waste a lot of coal resources This caused huge disasters to safety production. In view of the problem of reburning the residual structure of gas coal in the fire area of Pingshuo coalfield, according to the temperature distribution characteristics of the fire area, this paper uses the TA-Q600 synchronous thermal analyzer to conduct a constant temperature pyrolysis experiment on the coal in the fire area.
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