瞬变电磁法探测煤炭地下气化燃空区扩展的试验研究

Experimental study on detection of underground coal gasification cavity-growth by transient electromagnetic method

煤炭地下气化技术抛弃了全部庞大的、笨重的采煤设备与地面气化设备,并将传统的地面气化转化为地下有控制的气化新技术,具有安全性好、投资少、效率高、污染小、效益高等优点。在地下气化过程中,由于燃空区空间不断扩大影响炉内温度,同时引起燃控区上方煤岩层的过量移动和地表沉陷。如何监测气化过程中燃空区塌落空间的变化,对控制气化过程反应、炉内温度的稳定、燃空区上覆岩层塌落及地表沉陷起着至关重要的作用。本文提出采用瞬变电磁法(TEM)对急倾斜煤层中煤炭地下气化燃空区进行探测。现场试验研究表明,该方法能够较好地探测燃空区扩展范围。

All of mining and ground gasification equipment are abandoned by technology of underground coal gasification（UCG）,and traditional ground gasification is converted to underground controlled gasification.UCG have advantages of good safety,less investment,high efficiency,less pollution and good benefit.In process of UCG,the cavity-growth influences the furnace temperature,resulting excessive move of the coal-rock and subsidence of the earth＇s surface.Surveying change of the cavity-growth is very important for controlling gasification reaction,furnace temperature stability,fall of rock over cavity-growth,and surface subsidence.Transient electromagnetic method（TEM） is put forward for detecting cavity-growth of UCG in steep coal layer.The spot tests indicate that the range of cavity-growth can be effectively detected by this method.