| 摘要 |
<p>An ignition apparatus (150) configured to ignite an underground coal seam (151) in situ is disclosed. One of the major challenges for UCG is to ignite the coal underground, particularly in a safe and cost effective manner. Several methods have been proposed and used. One such method involves dropping hot coal or lowering an electrical heat resistance device into a vertically extending ignition well directly into an intended combustion zone and then injecting oxygen into the combustion zone via the injection well so that combustion is autogenous. The ignition apparatus disclosed attempts to overcome some of these issues of cost and safety by supplying an ignition device in the fuel/oxidiser injection tool (155). The ignition apparatus (150) comprising an ignition system, a positioning system, a sensor (170) and a controller (165). The ignition system comprises ignition means and an ignition tool (155) for igniting the underground coal seam (151) from within the well channel (154) or well liner encasing the well channel (154). The positioning system comprises coiled tubing (156) connected to the ignition tool (155) and extendible through a well head (153) within the well channel (154) to position the ignition tool (155) at a desired location within the well channel (154). The positioning system further comprises a spool (157) for transporting and dispensing the coiled tubing (156).</p> |
