地学前缘 ›› 2016, Vol. 23 ›› Issue (3): 97-102.DOI: 10.13745/j.esf.2016.03.013

• 煤中矿产及洁净煤技术 • 上一篇    下一篇

煤炭地下气化技术及其应用前景

刘淑琴，张尚军，牛茂菲，余力   

  1. 中国矿业大学(北京), 北京 100083
  • 收稿日期:2016-02-25 修回日期:2016-03-21 出版日期:2016-05-15 发布日期:2016-05-15
  • 作者简介:刘淑琴（1972—），女，博士，教授，从事洁净煤技术研究。E-mail：13910526026@163.com
  • 基金资助:

    国家自然科学基金项目（51476185）；国家重点基础研究发展计划“973”项目(2014CB238905)；中央高校科研业务专项基金项目(2009QH13)

Technology process and application prospect of underground coal gasification

LIU Shuqin,ZHANG Shangjun,NIU Maofei,YU Li   

  1. China University of Mining & Technology(Beijing), Beijing 100083, China
  • Received:2016-02-25 Revised:2016-03-21 Online:2016-05-15 Published:2016-05-15

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摘要：

煤炭地下气化是一种煤炭原位开采技术。文中介绍了煤炭地下气化的工艺过程、技术特征、技术发展历程及其应用前景，特别强调煤炭地下气化应用过程的科学选址及地下水污染防控问题。煤炭地下气化的析气过程是基于煤岩混杂的渗滤通道反应，包含沿径向及沿轴向的煤气化反应过程。随气化通道扩展形成单个稳定气化周期。基于长距离定向钻井及连续油管的移动注气点后退气化工艺，奠定了煤炭地下气化商业化应用的技术基础。地下气化煤气可用于燃气蒸汽联合循环发电，并逐步用作化工原料气。通过科学选址并采取地下水污染防控措施，可以使煤炭地下气化成为新一代的绿色化学采煤技术，具有广阔的应用前景。

关键词: 煤炭地下气化, 科学选址, 地下水污染, 煤气综合利用

Abstract:

Underground coal gasification(UCG) is a method of in situ coal mining. In this paper, the technology process, reaction characteristics, influencing factors, together with the development and application prospect of UCG were introduced. In addition, site selection and groundwater pollution prevention regarding UCG were especially emphasized. Gas production during UCG is based on the reactions of the mixture of coal and rocks in the percolation channel, and involves the chemical reactions along both the axial direction and radial direction. With the expanding of gasification face, the period of gas emission on stable process control is formed. The UCG technology of retraction gasification by moving injection using coiled tubing along long distance directional drilling borehole provides the technical basis for UCG commercialization. UCG gas could not only be used for IGCC, but also be used as chemical raw gas for synthesis of methanol, ethylene, oil, aromatic hydrocarbons, etc. UCG must have broad application prospect with the remarkable safe and environmental advantages if groundwater pollution is properly carried out.

Key words: underground coal gasification, site selection, groundwater pollution, gas utilization

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