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Study on the combustion characteristics of bituminous coal modified by typical inorganic acids

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  • Ni, Guanhua
  • Dou, Haoran
  • Li, Zhao
  • Zhu, Chuanjie
  • Sun, Gongshuai
  • Hu, Xiangming
  • Wang, Gang
  • Liu, Yixin
  • Wang, Zhenyang

Abstract

Acid fracturing technology is applied to increase the permeability of coal seams to promote gas extraction, but the effects of acid solutions on coal combustion cannot be ignored. This paper focuses on HF, HCl, and HNO3. The Bagchi method determines the mechanism function of each nonisothermal TG stage of acidified coal. Combining FTIR, TG-DTA, and KTA, this paper studies the combustion performance of acidified coal from the perspectives of the coal molecular structure evolution, combustion phenomenon, and kinetics. The results show that inorganic acids can destroy C=O in coal, resulting in the carbonyl groups in the HF, HCl, and HNO3 samples decreasing to 21%, 35%, and 0% of that in the RAW samples, respectively. Inorganic acid significantly enhances the reaction rate and thermal effect of combustion stage and improves the comprehensive combustion performance of coal, and the effect is in the order of HF > HNO3>HCl. Inorganic acids change the most likely mechanism function of initial weight loss stage. The oxidation increase of the HNO3 sample is greater than the corrosion weight loss, resulting in a corrosion ratio of −1.74%. HF and HCl reduce the activation energy of oxidation weight gain stage and increase the spontaneous combustion tendency of coal samples.

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  • Ni, Guanhua & Dou, Haoran & Li, Zhao & Zhu, Chuanjie & Sun, Gongshuai & Hu, Xiangming & Wang, Gang & Liu, Yixin & Wang, Zhenyang, 2022. "Study on the combustion characteristics of bituminous coal modified by typical inorganic acids," Energy, Elsevier, vol. 261(PA).
    • Handle: RePEc:eee:energy:v:261:y:2022:i:pa:s0360544222021041
    DOI: 10.1016/j.energy.2022.125214
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    References listed on IDEAS

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    2. Ruan, Renhui & Wang, Guan & Li, Shuaishuai & Wang, Min & Lin, Hui & Tan, Houzhang & Wang, Xuebin & Liu, Feng, 2024. "The effect of alkali and alkaline earth metals (AAEMs) on combustion and PM formation during oxy-fuel combustion of coal rich in AAEMs," Energy, Elsevier, vol. 293(C).
    3. Li, He & Lv, Xuefen & Lu, Jiexin & Liu, Meng & Yang, Wei & Hong, Yidu & Liu, Ting & Lin, Baiquan & Wang, Zheng, 2024. "Effect of cyclic thermal stimulation on the pore structure and fluid space of coal and inspiration for coalbed methane production," Energy, Elsevier, vol. 289(C).
    4. Jiang, Bingyou & Zhang, Yi & Zheng, Yuannan & Yu, Chang-Fei & Wang, Shiju & Lin, Hanyi & Lu, Kunlun & Ren, Bo & Nie, Wen & Yu, Haiming & Zhou, Yu & Wang, Ying, 2024. "Effect of acid-thermal coupling on the chemical structure and wettability of coal: An experimental study," Energy, Elsevier, vol. 294(C).
    5. He, Jiawei & Li, He & Yang, Wei & Lu, Jiexin & Lu, Yi & Liu, Ting & Shi, Shiliang, 2023. "Experimental study on erosion mechanism and pore structure evolution of bituminous and anthracite coal under matrix acidification and its significance to coalbed methane recovery," Energy, Elsevier, vol. 283(C).

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