基于压力TG-FTIR的深地下煤炭气化气化机制和动力学特征研究
Zhigang Zhang1, Yunfeng Du1, Lei Wang1
1China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, China.
ACS omega
|February 2, 2026
概括
地下煤炭气化对于清洁能源至关重要. 增加的热解压力,高达2.0MPa,改变了煤炭结构,影响了碳中和目标的气体释放和激活能量.
科学领域:
- 清洁的煤炭技术 清洁的煤炭技术
- 在现场资源利用
- 化学工程是化学工程的重要组成部分.
背景情况:
- 地下煤气化 (UCG) 对于清洁的煤炭利用和实现碳中和目标至关重要.
- 热解压力是影响UCG效率和产品产量的关键参数.
- 了解压力对煤炭热解的影响是优化UCG流程的关键.
研究的目的:
- 为了研究不同压力条件下的原煤的热解特性.
- 为了确定热解压力对气体演变 (CO2和CH4) 和激活能量的影响.
- 阐明压力煤炭热解过程中气体分离的机制.
主要方法:
- 结合加压热重力测量分析 (TGA) 和富里埃变换红外光谱学 (FTIR).
- 在高达2.0MPa的压力下对原煤热解的分析.
- 计算质量加权平均激活能量 (E-(m)) 和特定阶段的激活能量.
主要成果:
- 烧解压增加到2.0MPa,导致煤炭中的塑性变形,抑制了CO2和CH4的逃逸.
- 随着压力上升,质量加权平均激活能量 (E-m) 从7.108增加到21.414kJ/mol.
- 快速聚凝和热解阶段的激活能量增加,而缓慢的热解阶段的激活能量减少 (3.874至3.405kJ/mol).
结论:
- 热解压力显著影响煤炭中宏分子结构的分解和多重凝结.
- 压力诱导的塑性变形在UCG过程中在气体分离中起着关键作用.
- 这些发现提供了对压力热解机制的见解,支持深层地下煤炭气化的实际应用.
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