高岭土与埃洛石对生物质成型颗粒灰熔融特性的影响OA北大核心

In view of the problems that difficulty in slag discharge from the grate and slagging and corrosion on the heating surface which are commonly occurred during the biomass pellets pure combustion or co-combustion process,the effects of kaolin and halloysite on the ash fusion behavior of biomass pellets were studied.The ash fusion temperatures,mineral phase transformation,weight loss characteristics and melt fraction of ash prepared from the biomass pellets were analyzed by ash fusion tester,X-ray diffractometer(XRD)and simultaneous thermogravimetric analyze(STA).The results showed that the formation of molten slag during combustion process of biomass pellets,were mainly attributed to low melting point sodium silicate,sodium mica and albite.The addition of kaolin increased the Si and Al elements in the ash,and inhibited low temperature eutectic between sodium mica and anorthite,which promoted the disappear of sodium mica and sodium silicate.The quartz and Na-rich anorthite became the major mineral phase,and the high melting point mineral phase microcline and zeolite were generated.The mineral phase in the ash changed little with the addition of halloysite,and only the diffraction peak of quartz was enhanced.Blending 3％kaolin could enhance the soften temperature of biomass ash by 110℃without affecting the initial fusion temperature.Halloysite could increase the initial fusion temperature of biomass ash by nearly 50℃at the same blending ratio.Kaolin and halloysite could reduce the ash melt fraction from 31.5％corresponding to the soften temperature to 13.2％and 19.6％,respectively.