Comprehensive prevention and control technology of coal spontaneous combustion on roof cutting and retained roadway in stopping line

doi:10.16265/j.cnki.issn1003-3033.2020.08.007

Abstract

Abstract: In order to solve problem of continuous CO emission from roof-cutting and pressure-relieving roadway in stopping line, air leakage characteristics were analyzed by using continuous release method of tracer gas (SF₆). Then, measures of air curtain and stack plugging, CO₂ prevention technology and new type fly ash compound colloid technology were applied to control left coal oxidizing of possible high temperature points. The results show that air leakage of stopping line features two sources and two sinks with a total air leakage of 181 m³/min which will be 135 m³/min after sealing upper and lower corners and rear of hydraulic support with air curtain and stack. CO₂ could change negative pressure state of the air leakage path to a positive one and would be inert and reduce temperature in a short time, but it could not be retained for a long time with an effective storage time of about 10 days. At last, the new fly ash composite colloid contains 10% of sodium silicate, 4% of Sodium bicarbonate, 0.5% of polyacrylamide and water cement ratio at 1∶2, and with field application of colloid technology, average air leakage would be 9 m³/min with no CO emission.

Key words: stopping line, roof-cutting and pressure-relieving roadway, coal spontaneous combustion, fly-ash, composite colloid

CLC Number:

X936

DU Haigang, ZHAI Wenjie, XIE Jun, FENG Shan. Comprehensive prevention and control technology of coal spontaneous combustion on roof cutting and retained roadway in stopping line[J]. China Safety Science Journal, 2020, 30(8): 44-50.

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