Scholarlink

<p>This study examines the influence of moisture content on the spontaneous combustion behavior of coal from the Barapukuria coal mine, Bangladesh, with a focus on CO₂/CO ratios as indicators of self-ignition tendencies. Proximate analysis of Barapukuria coal revealed an average inherent moisture content of 2.73%, with a high volatile matter and calorific value, which predisposes the coal to spontaneous combustion. The effect of moisture content (ranging from 3.67 to 17.35%) on oxidation and self-ignition was assessed by analyzing CO₂/CO ratios and thermal stability at varying temperatures. Results indicate that moisture plays a dual role. At intermediate moisture levels (8.32–13.2%), moisture facilitates coal–oxygen interactions and enhances oxidation activity; however, this enhanced oxidation is accompanied by improved heat dissipation and higher critical temperatures, which increase the coal’s thermal stability and delay self-ignition. Conversely, at higher moisture levels (&gt; 13.2%), moisture evaporation absorbs heat, reducing oxidation rates and further suppressing self-heating. The optimal moisture content for balanced oxidation and stability was found to be 13.2%, where peak CO₂/CO ratios of 2.15 were observed at 280&#xa0;°C. Furthermore, DSC analysis showed that intermediate moisture levels (8.32%–13.2%) significantly enhance thermal stability, increasing the critical temperature of coal from 295&#xa0;°C (at 5% moisture) to 335&#xa0;°C. The φ(CO₂)/φ(CO) ratio emerged as a reliable indicator for monitoring spontaneous combustion tendencies, with higher ratios correlating with oxidation reactivity rather than direct ignition risk. These findings underline the importance of moisture control in coal handling and storage, as maintaining moisture levels between 8.32% and 13.2% provides an optimal balance between oxidation activity and heat dissipation, thereby reducing the overall risk of spontaneous combustion and enhancing mine safety.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Impact of moisture content on CO2/CO ratios to observe self-ignition behavior in Barapukuria coal mine, Bangladesh

  • 期刊论文

  • 发表日期：

    2026年4月14日

查看全文
  • Arifuggaman Arif,
  • Chunlei Zhang,
  • Mahabub Hasan Sajib,
  • Md Habibullah,
  • Md Nasir Uddin,
  • Khezr Mohammadamini,
  • Muhammad Naseem

摘要

This study examines the influence of moisture content on the spontaneous combustion behavior of coal from the Barapukuria coal mine, Bangladesh, with a focus on CO₂/CO ratios as indicators of self-ignition tendencies. Proximate analysis of Barapukuria coal revealed an average inherent moisture content of 2.73%, with a high volatile matter and calorific value, which predisposes the coal to spontaneous combustion. The effect of moisture content (ranging from 3.67 to 17.35%) on oxidation and self-ignition was assessed by analyzing CO₂/CO ratios and thermal stability at varying temperatures. Results indicate that moisture plays a dual role. At intermediate moisture levels (8.32–13.2%), moisture facilitates coal–oxygen interactions and enhances oxidation activity; however, this enhanced oxidation is accompanied by improved heat dissipation and higher critical temperatures, which increase the coal’s thermal stability and delay self-ignition. Conversely, at higher moisture levels (> 13.2%), moisture evaporation absorbs heat, reducing oxidation rates and further suppressing self-heating. The optimal moisture content for balanced oxidation and stability was found to be 13.2%, where peak CO₂/CO ratios of 2.15 were observed at 280 °C. Furthermore, DSC analysis showed that intermediate moisture levels (8.32%–13.2%) significantly enhance thermal stability, increasing the critical temperature of coal from 295 °C (at 5% moisture) to 335 °C. The φ(CO₂)/φ(CO) ratio emerged as a reliable indicator for monitoring spontaneous combustion tendencies, with higher ratios correlating with oxidation reactivity rather than direct ignition risk. These findings underline the importance of moisture control in coal handling and storage, as maintaining moisture levels between 8.32% and 13.2% provides an optimal balance between oxidation activity and heat dissipation, thereby reducing the overall risk of spontaneous combustion and enhancing mine safety.