生物质炭添加比例对煤粉燃烧性能的影响

农业废弃物含有较高的C元素和较低的S元素及灰分,将这类生物质炭化并细磨后,与煤粉混合喷吹进入高炉燃烧,可有效利用可再生能源,减少炼铁工业的CO_2排放,且有利于提高生铁质量,并显著提高煤粉的燃烧率。因此,对玉米秸秆和花生壳热解产物进行了表征分析,采用差热分析法研究这两种生物质炭与煤粉按不同配比混合对煤粉燃烧性能的影响。SEM及BET检测结果均表明,玉米秸秆炭和花生壳炭的组织疏松,比表面积大,硫与灰分含量低,可明显增大试样与氧的接触面积;热重试验结果表明,生物质炭与煤粉按3∶7的质量比混合的燃烧性能最好,着火点明显降低,燃烧过程稳定,燃烧率显著提高。

Effect of Biochar Addition Ratio on Combustion Performance of Pulverized Coal

After the process of carbonization and fine grinding, the biomass of higher C and lower S elements and ash contained in agricultural wastes, when mixed with pulverized coal, are to be injected into blast furnace for combustion, which can effectively utilize renewable energy, reduce CO2 emission of iron-making industry, improve cast iron quality, and significantly improve the combustion rate of pulverized coal. Therefore, a characterization analysis has been made of the pyrolysis products of corn straw and peanut hull, and based on the differential thermal analysis, a research has been carried out on the effects of different mixing ratios of the two biomass charcoal on the combustion performance of pulverized coal. SEM and BET test results show that the corn straw charcoal and peanut shell are characterized with a loose structure, a large specific surface area and a low value of sulfur and ash content, which helps to significantly increase the contact area between sample and oxygen. The thermogravimetric test results show that the combustion performance of the mixture of biochar and pulverized coal is the best with a mass ratio of 3:7, with its ignition point obviously reduced, the combustion process stabilized and the combustion rate significantly increased.