School of Chemical and Environment Engineering,China University of Mining and Technology( Beiing)

为了减少SO2的排放量,提高煤炭的固硫效率,采用电石渣和赤泥复配作为主固硫剂,在Ca/S物质的量比为1.8,试验温度为1 000℃的条件下进行固硫试验研究。选择固硫助剂A、助剂C、粉煤灰进行三因素两水平的正交试验。试验结果表明:助剂A、助剂C、粉煤灰B分别占主固硫剂质量百分比5%、8%、4%时固硫效果最好,固硫率达64.87%。同时采用扫描电镜分析发现,添加固硫剂高温处理后表面结构有不同程度的变化。利用热重分析仪考察复配助剂对煤样燃烧特性的影响。加入复配固硫剂的煤样,其热重曲线与原煤基本一致。着火点较原煤稍微延缓,但改变不大。燃烧过程变为2段燃烧,而且第2段燃烧在较高温度下,燃烬温度升高,燃烬时间明显延长。

In order to reduce SO2 emission volume and to improve the sulfur fixed efficiency of the coal,the carbide slag and red mud were applied to be compound as the main sulfur fixative.A study on the sulfur fixed experiment was conducted under Ca 1 S substance amount ratio of 1.8 and experiment temperature of 1 000 °C.An orthog onal experiment of three factors and two levels was conducted with the selection of sulfur fixed additive A, additive C and fly ash B.The experiment results showed that whe n the adding quantity of compound additive individually was the additive A with 5%, additive C with 8% and fly ash B with 4% in the percentages of the main sulfur fixative,th e sulfur fixed effect was the best and sulfur fixed efficiency was 64.87%.Meanwhile ,the analysis with scanning electron microscope showed that the surface structure would be varied in different degree after the high temperature treatment of sulfur fixative added .A thermogravimetric analyzer was applied to investigate the compound additive af fected to the combustion features of the coal sample. Thermogravimetric curve of coal sample added with the compound sulfur fixative was the same to the raw coal basica lly.The ignition point was a lttle bit delay to the raw coal,but there was no big change.The combustion process would be two stage combustions,the second stage combusti on would be in a high temperature,the burnout temperature would be risen and the burnout time would be expended obviously.

"十一五"国家科技支撑计划重点资助项目(2006BAF02A15-08-03)；