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针对易自燃厚煤层综放面采空区,采用氧浓度指标和漏风风速指标划分了采空区自燃三带范围。应用FLUENT软件,通过建立采空区模型,设定模拟参数,采用漏风风速指标划分出采空区氧化带范围为18~93 m。通过在采空区进回风巷各铺设150 m束管,布置10个测点,经过50 d井下采样实验室色谱分析,采用氧浓度指标划分出采空区氧化带范围为20~93 m。2种指标划分自燃三带误差在合理范围内,最终确定采空区氧化带范围为18~93 m。
Aiming at the gob area of fully mechanized caving face with spontaneous combustion thick seam, the range of spontaneous combustion in the gob area is divided by oxygen concentration index and wind speed index. By using FLUENT software, the mined-out area model was set up, the simulation parameters were set, and the range of oxidation zone was 18 ~ 93 m. The 150m beam tubes were laid in the return airways of the goafs and 10 measuring points were arranged. After 50 days of downhole sampling laboratory chromatographic analysis, the oxidation zone of the goaf was delineated by the oxygen concentration index in the range of 20-93 m. The error of three zones of spontaneous combustion with two kinds of indexes is within a reasonable range, and the oxidation zone of goaf is finally determined to be 18 ~ 93 m.