Controlled retracting injection point (CRIP) system: a modified-stream method for in situ coal gasification
Controlled retracting injection point (CRIP) system: a modified-stream method for in situ coal gasification
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发表时间：
1981-04
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通讯作者：
R. Hill;M. J. Shannon
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作者：
R. Hill;M. J. Shannon
在实践中，煤炭地下气化过程面临各种问题，难以维持和控制高效的长期运行。主要问题之一是随着燃烧的进行，需要将注入点（来自地表的助燃空气或氧气注入煤层）移动到未燃烧煤的新区域。为了更好地控制气化过程，我们建议使用受控回缩注入点或 CRIP 系统。受控回缩注入点或 CRIP 系统旨在将注入点保持在煤层底部，并将其从塌陷区向后移动到新鲜的固体煤中。受控回缩原理允许操作员选择移动喷射点以及燃烧区的最佳时间和距离，以获得气化器的最佳性能。虽然该系统适用于任何厚度的煤层，但它特别适合厚煤层，因为煤层塌陷和燃烧导致空腔增大。将生产通道放置在注入井上方煤层顶部可确保隔离其塌陷影响，并降低堵塞生产井的风险。 « 更少
The underground coal gasification process, in practice, is subject to various problems that make it difficult to maintain and control an efficient long-term operation. One of the major problems is the need to move the injection point (where the combustion-supporting air or oxygen from the surface is fed into the coal seam) to new areas of unburned coal as the burn progresses. To achieve better control of the gasification process, we recommend the controlled retracting injection point or CRIP system. The controlled retracting injection point or CRIP system is designed to keep the injection point on the bottom of the coal seam and to move it backwards away from the collapse zone into fresh, solid coal. The principle of controlled retraction allows the operator to choose the optimum time and distance to move the injection point, and consequently the burn zone, to get the best possible performance from the gasifier. Although this system will work with coal seams of any thickness, it is particularly well suited to thick coal seams where the cavity grows by coal collapse as well as combustion. Placement of the production channel at the top of the seam above the injection well ensures isolation from themore » effects of collapse and reduces the risk of plugging the production well.« less