CO〈sub〉2〈/sub〉抑制煤氧吸附过程的实验研究

煤对CO2的吸附能力较强,CO2分子会优先吸附在煤表面,减少O2的吸附量,抑制煤氧吸附过程。通过程序升温实验,研究CO2对煤氧吸附的抑制作用,测定煤样在不同CO2浓度下产生O2、CO、CH4的浓度值,分析CO2浓度对耗氧速率、CO产生率的影响规律。结果表明,37%～50%浓度的CO2对煤体耗氧速率的抑制效果明显,对煤样的CO产生率及甲烷浓度有降低作用,说明CO2能够有效抑制煤氧吸附过程,防止煤炭氧化自燃的发生。研究结果对CO2防灭火技术的开发与应用具有指导作用。

Experiment Research on CO2 Inhibiting the Process of Coal-oxygen Adsorption

Coal for C02 adsorption ability was strong, coal was preferentially adsorbed by CO2, which reduced the amount of 02 adsorption and inhibited the process of coal adsorption oxygen, the coal had strong adsorption ability to CO2. Through carrying out temperature-programmed experiment, the inhibition that CO2 affecting the process of coal adsorption oxygen was studied, the concentration values of 02, CO, CI-I4 that coal samples produced at different concentrations of CO： were measured, and the discipline that CO2 concentration influencing on consumption rate of oxygen and production rate of CO were analyzed. The results showed that, when the concentration of C02 was 37% ～50%, it had a significantly inhibitory effect on the consumption rate of oxygen in the process of coal oxidation, and decreased the ratio that the amount of releasing CO changing with temperature. CO2 can effectively inhibit the process of coal adsorption oxygen, and prevent the occurrence of spontaneous combustion of coal. The results of this experiment had guidance significance for the development and application of fire prevention technology on CO2.