麦草木素与煤混烧灰熔融特性  

Ash-fusion characteristics of wheat straw lignin and coal co-combustion

作　　者：徐婧[1] 余春江[1] 秦建光[1] 马孝琴[1] 方梦祥[1] 骆仲泱 岑可法[1] 

机构地区：[1]浙江大学热能工程研究所能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2007年第7期1186-1190,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家"973"重点基础研究发展规划资助项目(2001CB409600);浙江省科技计划资助项目

摘　　要：为合理利用造纸工业酸法制浆的副产品麦草木素,结合工程实际需要,对木素与煤混烧灰的熔融特性进行了研究.将质量分数为0～95%的麦草木素与煤混烧制成混烧灰,通过测定混烧灰的熔点,观察到随着木素质量分数的增大,混烧灰的熔点出现下降、上升再下降的趋势.结合灰成分分析,利用K2O-Al2O3-SiO2和CaO-Al2O3-SiO2 2个三元系统相图,验证了混烧灰熔融特性曲线的变化趋势与相图中矿物形成温度的变化趋势相一致,从而得出灰成分变化是造成混烧灰熔融特性变化的根本原因,同时也发现了生物质与煤混烧可以改变生物质类燃料低熔点的性质,在燃烧利用上较单纯燃烧生物质更具优越性.Research was conducted on the ash fusion characteristics of co-firing with lignin and coal to make full use of wheat straw lignin, which is the by-product of acid pulping method in paper manufacturing industry. The experiment of co-firing was carried out in a series of mixture ratios with the lignin mass percent ranging from 0 to 95%, and the co-firing ash fusion temperature was te.sted. Results showed that the temperature tendency curve is undulant. Combining with ash chemical composition analysis, K2O-Al2O3-SiO2 and CaO-Al2O3-SiO2 three-phase diagrams were used to interpret the reason for this undulant change. Results showed that the tendency of the mixed ash fusion temperature and that of the minerals formation temperature in three-phase diagrams are uniform, and it was concludedthat co-firing with lignin and coal is superior to pure biomass combustion and that changes of the ash chemical composition is the main cause of changes of the ash fusion characteristics.

关 键 词：混烧 碱金属 熔融特性 三元相图 

分 类 号：X793[环境科学与工程—环境工程]