Effects of pre-oxidized temperature and pre-oxidized oxygen concentration on burning characteristics of pre-oxidized coal

Niu, Haijun; Yang, Yanxiao; Li, Shuopeng

doi:10.1016/j.fuel.2022.125723

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…Coal has distinct quality change characteristics during the combustion process, which can reflect its combustion efficiency and rate of loss 12,40 . The combustion thermogravimetric characteristics of 12 test coal samples are shown in Figure 5; it can be seen that the effect of malic acid on fresh coal and oxidized coal is quite different, and the effect of different concentrations of DMA on coal is different.…”

Section: Resultsmentioning

confidence: 99%

“…41,42 However, when the pre-oxidation temperature becomes too high, the oxidation heat release capacity of coal decreases, and the inhibitory effect of malic acid is synergistically intensified by the preoxidation treatment, leading to a significant increase in the characteristic inhibition point temperature of malic acid. 12,43 Malic acid did not show an obvious inhibitory effect on Y200, as the inhibitory effect of malic acid and the promotion effect of pre-oxidation at 200 C mutually counteracted each other.…”

Section: Thermogravimetric Characteristicsmentioning

confidence: 91%

“…loss. 12,40 The combustion thermogravimetric characteristics of 12 test coal samples are shown in Figure 5; it can be seen that the effect of malic acid on fresh coal and oxidized coal is quite different, and the effect of different concentrations of DMA on coal is different. After the coal sample was treated with DMA, the low-temperature stage of the thermogravimetric curve of the coal was delayed, and there was a cross point with the thermogravimetric curve of the coal without malic acid treatment.…”

Section: Thermogravimetric Characteristicsmentioning

confidence: 99%

“…11 Niu et al explored the influence of oxidation temperature and oxygen concentration on the thermal behavior characteristics of coal, and found that the temperature and oxygen conditions in the goaf had a significant effect on the secondary oxidation process of coal, and mainly acted on the low-temperature oxidation stage of coal water evaporation, gas precipitation, and oxygen absorption. 12 Bu, Tang, Zhu et al studied the effect of temperature field on the phase characteristics and chemical structure of coal, and found that pre-oxidation treatment would increase the burning tendency of coal oxidation, but too high-temperature field would consume the amount of organic matter and active groups in coal. [13][14][15] Deng, Gao et al compared the pore structure characteristics and thermal characteristics of oxidized coal and RC, and found that the oxidation heat production characteristics of oxidized coal with oxidation temperature less than 140 C are better than that of fresh coal.…”

Section: Introductionmentioning

confidence: 99%

“…Xu et al explored the effect of low‐temperature oxidation treatment on the internal chemical structure of coal, and found that the hydroxyl and side‐chain alkane structures of coal gradually increased after oxidation, and the side chain length was shortened, which was more prone to elementary oxidation reactions 11 . Niu et al explored the influence of oxidation temperature and oxygen concentration on the thermal behavior characteristics of coal, and found that the temperature and oxygen conditions in the goaf had a significant effect on the secondary oxidation process of coal, and mainly acted on the low‐temperature oxidation stage of coal water evaporation, gas precipitation, and oxygen absorption 12 . Bu, Tang, Zhu et al studied the effect of temperature field on the phase characteristics and chemical structure of coal, and found that pre‐oxidation treatment would increase the burning tendency of coal oxidation, but too high‐temperature field would consume the amount of organic matter and active groups in coal 13–15 …”

Section: Introductionmentioning

confidence: 99%

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Study on the inhibitory effect of DL‐malic acid on the phase structure and combustion characteristics of coal

Sun,

Niu,

Yang

et al. 2023

Fire and Materials

Self Cite

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DL‐malic acid (DMA), as a recognized antioxidant inhibitor and chelating agent in the food and chemical industries, has good application prospects in coal fire prevention and control. This paper investigates the impact of a DMA solution on the surface properties and phase structure of coal through a range of analytical techniques, including electron microscope scanning, particle size analysis, and x‐ray diffraction. The thermal behavior characteristics of DMA‐treated coal were analyzed using thermogravimetric experiments. The results show that after adding malic acid, the particle size of coal sample is reduced, the sphericity and roundness are reduced, and the pore size is increased. The hydroxyapatite and calcite components in coal were dissolved and consumed, and the calcite components were gradually depleted with the increase of DMA concentration. The flocculent structure produced by the condensation of the crushing residue and broken small particles are attached to the internal pores of coal, which reduced the coal oxygen contact sites and increases the content of the sealed solution, resulting in the increase of the thermal characteristic temperature of the coal and the inhibition of the oxidation heat generation process. DMA has obvious inhibitory effect on fresh coal and oxidized coal, and the inhibitory effect is stronger on high‐temperature oxidized coal. Therefore, DMA can be effectively applied to the prevention and control of spontaneous combustion of residual coal in goaf. The research results provide a reference for the research of coal fire prevention technology and the preparation of environmentally friendly flame retardant materials.

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Section: Resultsmentioning

confidence: 99%