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为研究密闭火区高温煤体在注气灭火过程中的降温及自燃抑制效应,将理论分析与实验相结合,分析密闭火区空气中的O2质量分数变化原因,建立O2质量守恒动态模型,得到高温煤体在注气过程中的降温特征及CO衰减规律。结果表明:高温煤体在注气初期出现降温滞后现象;注入CO2气体及N2时,煤样CO消失的温度分别为74和58℃;注入含氧10%的CO2混合气时,CO在38℃消失;注入含氧10%的N2混合气时,CO持续存在;实验证明CO2灭火效果优于N2。
In order to study the cooling and spontaneous combustion suppression effects of high temperature coal in airtight fire area during gas injection, a theoretical analysis and experiment are combined to analyze the reason of O2 mass change in the air of airtight fire area and to establish the O2 mass conservation dynamic model. COOLING CHARACTERISTICS AND CO DECREASING LAW OF HIGH TEMPERATURE COAL BATH DURING GAS INJECTION. The results show that: the temperature of coal in high temperature decreases at the initial stage of gas injection; when CO2 gas and N2 are injected, the temperature of CO disappearing is 74 and 58 ℃ respectively; when CO2 is mixed with 10% Disappeared. When CO 2 containing 10% oxygen was injected into the mixture, CO persisted. CO2 emission was better than N2 in experiments.