Abstract:

After over 100 years worldwide extensive research and numerous field tests underground coal gasification (UCG) has not been applied in industry even though it had long been asserted to be the future syngas (CO + H₂) production technology with many advantages. Although some literatures believe that this technology is the development direction of future coal utilization technology, the phenomenon that it has not yet achieved industrial application shows that it has a key scientific (neck) problem that has not been fully paid attention to. This work compares the productivity and syngas composition of underground coal gasification field tests with those commonly reported for the main types of industrial gasifies used today and analyzes the drawbacks in the UCG from the principle of mass transfer and reaction in the stagnant boundary layer on the coal surface and in the gasification tunnel.

Key words: coal, underground gasification, mass transfer, syngas, carbon monoxide, carbon dioxide

摘要：

煤地下气化技术历经国内外一百多年的实验室研究和大量现场试验仍然存在产率低等关键问题。虽然一些文献认为该技术是未来煤炭利用技术的发展方向，但其至今仍未实现工业应用的现象说明其本身存在尚未被充分关注的关键科学（卡脖子）问题。本文从化学反应工程基本原理出发分析该技术涉及的关键传质与反应过程，并与现代大型地上煤气化技术对比，探讨其工业应用技术挑战的科学根源。

关键词: 煤, 地下气化, 传质, 合成气, 一氧化碳, 二氧化碳