Study on goaf gas drainage technology and float coal spontaneous combustion coupling control

ZHAO Qi; WANG Xuefeng; HUANG Ge; WANG Yansheng

doi:10.13199/j.cnki.cst.2017.10.019

Abstract：In order to solve the coupling governance problem of coal spontaneous combustion and gas overrun in gob of Ximing coal mine,a heterogeneous porous media 3D model and simulation were applied to set up the comprehensive fire prevention and control technical plan and to conduct the site monitoring and measuring with the measures of the high level gas drainage gateway and in comparison with the change conditions of the air velocity flow field,gas concentration field and oxygen concentration field in the goaf before and after the two sides of the air intake and air retuning gateways sealed in the goaf.The results showed that the gas drainage method with the high level gas drainage gateway was applied to seal the air retuning gateway and the transportation gateway and thus the air leakage of the coal mining face to the goaf was reduced.The width of oxidized strip was reduced by 6 m,the gas drainage volume faction of the high level drainage gateway was increased by 4.12％ and the gas drainage efficiency was improved.The site monitoring and measuring showed that the gas drainage flow volume of the high level gas drainage gateway was 19.18～ 20.57 m3/min,the gas drainage flow volume with the pipe buried at the top comer was 10.16～11.32 m3/min and thus great gas emission from the goaf and the gas overlimit phenomenon at the top comer were eliminated.With the implementation of the inhibitor agent sprayed,nitrogen injection and other measures,the oxidation phenomenon of the coal left in the goaf of No.48205 coal mining face was effectively controlled and the safety production of the coal mining face was ensured.