煤炭地下气化化学点火研究

STUDY ON SOLIDIFIED LIQUID CHEMICAL IGNITION AGENT FOR UNDERGROUND COAL GASIFICATION

针对无井式煤炭地下气化在深部盲孔中点火的特点,研究了化学液体凝固点火剂和点火方法.利用基体燃料甲醇、凝固剂硬脂酸、催化剂甲醇钠、助燃剂铝粉和碳粉、氧化剂高氯酸钾、黏结剂硝化棉、增塑剂石蜡以及稳定剂大苏打制取了性能稳定、燃烧焓为14 246.5 kJ/kg的化学点火剂.点火实验表明,在点火开始后75 min煤层温度达到其燃点;点火后85 min出口气体可燃组分(H2+CO+CH4)含量超过20%,煤层点火成功.

The solidified liquid chemical ignition agent and ignition method are investigated in consideration of characteristics of the ignition in deep blind hole of the non-well underground coal gasification. The chemical ignition agent with stable performance and a combustion enthalpy of 14 246.5 kJ/kg is prepared with methanol as main fuel, stearic acid as coagulant, sodium methoxide as catalyst, aluminum and carbon powder as combustion improver, potassium perchlorate as oxidizer, nitrocellulose as binder, paraffin as plasticizer and sodium thiosulfate as stabilizer. The ignition test result shows that the coal seam temperature reaches ignition point 75 min after ignition; 85 min after ignition combustible component （H2＋CO＋CH4 ） composition of exit gas exceeds 20 % and this indicates that the coal seam is successfully ignited.