高温环境下灰中矿物质对长广煤燃烧固硫行为的影响

The desulfurization behavior of mineral matter in ash during coal combustion at high temperature

针对煤粉炉及层燃炉中煤灰固硫特性,以高温固硫物相硫铝酸钙为固硫产物,对掺混不同比例煤灰的三种煤和添加设定比例CaO和Al2O3后煤的高温固硫特性进行了分析。结合XRD晶相分析和SEM表面形态分析发现,相对低比例煤灰而言,高比例煤灰更能提高煤的固硫率,渣样中硫铝酸钙含量明显增多。煤中添加CaO和Al2O3添加剂后,1 300℃下的固硫率为24%,此时产物中有固硫物相硫铝酸钙生成。

In allusion to the desulfuration characteristic of coal ash, the desulfuration of the ash and CaO, Al2O3 added to Changguang coal with different proportions at high temperature was studied. Sulphoaluminate as the main desulfuration product was analyzed by X-ray diffraction and SEM visualization. Experimental results indi cate that higher proportion of ash added can improve the desulfuration efficiency. The sulphoaluminate content in residue increases with increasing the addition of ash. The desulfuration efficiency of the additive CaO and Al2O3 is up to 24% at 1 300 ℃, at the same time the sulphoaluminate is detected in the residue.