不同含水率煤的燃烧特性实验

高鹏永; 石必明; 张雷林; 薛创; 钟珍; 刘义

doi:10.13272/j.issn.1671-251x.2021030017

摘要: 为研究水分含量对煤燃烧特性的影响，以朱集西煤矿烟煤为研究对象，利用锥形量热仪测试了不同含水率煤样点燃时间、热释放速率、总热释放量、烟气生成速率、总烟释放量、CO生成速率等参数，并分析了煤样燃烧效率。实验结果表明：① 煤样点燃时间随着含水率增大先减少后增加，煤样点燃时间从长到短对应的含水率排序为17.82%＞13.82%＞1.82%＞5.82%＞9.82%；煤样热释放速率峰值随含水率增大先减小后增大再减小，煤样热释放速率峰值从大到小对应的含水率排序为9.82%＞1.82%＞5.82%＞13.82%＞17.82%；煤样总热释放量、烟气生成率和总烟释放量随含水率增大先减小后增大再减小，其从大到小对应的含水率排序为1.82%＞9.82%＞5.82%＞13.82%＞17.82%；在燃烧后期，含水率5.82%的煤样CO生成速率最低，含水率17.82%的煤样CO生成速率最高，高水分含量会增大CO产率；煤样燃烧效率从大到小对应的含水率排序为9.82%＞5.82%＞1.82%＞13.82%＞17.82%。② 适当的水分含量可提高煤的燃烧性能，应选择含水率为5.82%～9.82%的煤，可缩短煤点燃时间，减小烟气生成率、总烟释放量和CO生成速率，提高热释放速率和燃烧效率。

Abstract: In order to study the effect of moisture content on the combustion characteristics of coal, taking the bituminous coal from Zhujixi Coal Mine as the research object, the method uses cone calorimeter to test the parameters of ignition time, heat release rate, total heat release, smoke generation rate, total smoke release and CO generation rate of coal samples with different moisture content and analyzes the combustion efficiency of coal samples. The experimental results show the following points. ① The ignition time of coal samples decreases first and then increases with the increase of moisture content. The order of moisture content of coal samples corresponding to ignition time from long to short is 17.82%>13.82%>1.82%>5.82%>9.82%. The peak heat release rate of the coal sample decreases first, then increases and then decreases with the increase of water content. The order of moisture content of coal samples corresponding to peak heat release rate from large to small is 9.82%>1.82%>5.82%>13.82%>17.82%. The total heat release, smoke generation rate, and total smoke release of coal samples decrease first, then increase and then decrease with the increase of water content. The order of the moisture content of coal samples corresponding to the total heat release, smoke generation rate, and total smoke release from large to small is 1.82%>9.82%>5.82%>13.82%>17.82%. In the late stage of combustion process, the coal sample with 5.82% moisture content has the lowest CO generation rate, and the coal sample with 17.82% moisture content has the highest CO generation rate. The high moisture content will increase the CO yield. The order of the moisture content of coal samples corresponding to the combustion efficiency from high to low is 9.82%>5.82%>1.82%>13.82%>17.82%. ② Appropriate moisture content can improve the combustion performance of coal. It is suggested to choose the coal with moisture content of 5.82% to 9.82% so as to shorten the coal ignition time, reduce the smoke generation rate, total smoke release and CO generation rate, and improve the heat release rate and combustion efficiency.

不同含水率煤的燃烧特性实验

Combustion characteristics experiments of coal with different moisture content