花生壳与煤加压热解和掺烧成灰矿物相演变研究

MINERAL TRANSFORMATION OF CHAR AND CO-FIRING ASH DURING COAL BLENDING WITH PEANUT HUSK UNDER PRESSURIZED CONDITIONS

在不同压力(0.1~6.0 MPa)、不同温度(800~1100℃)的高温高压管式炉中制备花生壳焦、煤焦及其混合灰,并用X射线衍射(XRD)分析样品的矿物相和微晶结构。结果表明:温度对花生壳与煤混合物中矿物相迁移的影响大于压力对矿物相迁移的影响。随着压力的增大,煤焦和花生壳焦的微晶结构更加有序;煤与花生壳的混合会促进钙长石的形成,抑制莫来石的形成。当混合比较高时,压力主要影响花生壳的燃烧和矿物质的转化。当混合比较低时,压力的变化对煤焦和花生壳焦的相对含量有一定影响,但对其矿物相种类影响不大,压力对矿物质行为的影响主要通过影响煤粉的着火方式而实现。

The influence of pressure(0.1-6.0 MPa)on the mineral phase of coal char and peanut husk char and the carbon crystal structure and the mineral conversion of blended ash were investigated by using the tube furnace at higher temperature and pressure combined with the analysis of X-ray diffraction meter(XRD). The results indicate the pressure has little effect on the main mineral phases of peanut husk char and coal char,but it can affect the relative contents of mineral phases. Also,the graphitization degree of peanut husk char and coal char increases with increasing pressure. The blending of peanut husk inhibits the formation of mullite and promotes the formation of anorthite. When blending ratio is relatively low,the pressure mainly affects the mineral behavior by affecting the way of coal powder ignition. When blending ratio is high,the pressure mainly affects the combustion of biomass and thus the transformation of minerals. The effect of temperature on the mineral conversion behavior of blended ash is more significant than that of pressure.