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针对生物质高氯、高碱金属含量导致的直接燃烧产生的受热面腐蚀问题,对生物质燃烧过程中Cl、K和Na的析出规律进行研究。使用马弗炉在500~900℃下燃烧麦秆、稻秆、玉米秆、棉花秆和油菜秆5种生物质,对灰样进行XRF和XRD分析,获得上述物质中Cl、K和Na的析出规律。结果表明:在500~600℃下燃烧时,少量Cl和K析出;在600~800℃下燃烧时,大量Cl和K以KCl形式析出;当燃烧温度高于800℃以上,除油菜秆外所有生物质中Cl和K的析出非常缓慢。在500~900℃下燃烧时,生物质灰样中Na含量变化均很小。
Aiming at the corrosion of heated surface caused by direct combustion caused by high chlorine and high alkali content of biomass, the precipitation rules of Cl, K and Na in biomass combustion process were studied. Five kinds of biomass of wheat straw, rice straw, corn stalk, cotton stalk and rape stalk were burnt at 500-900 ℃ by using a muffle furnace. XRF and XRD analyzes of the ash samples were carried out to obtain the precipitation of Cl, K and Na in the above materials law. The results showed that a small amount of Cl and K were precipitated at 500-600 ℃. When burning at 600-800 ℃, a large amount of Cl and K were precipitated as KCl. When the combustion temperature was higher than 800 ℃, all except rape stalk The precipitation of Cl and K in biomass is very slow. At 500 ~ 900 ℃ combustion, the biomass ash samples Na content changes are small.