碱金属钾对秸秆燃烧成灰特性的影响  

THE INFLUENCE OF POTASSIUM ON ASH CHARACTERISTIC DURING STRAW COMBUSTION

作　　者：杨天华[1] 开兴平[1,2] 孙洋[1] 贺业光[1] 孟凡华[1] 李润东[1] 

机构地区：[1]沈阳航空航天大学清洁能源与环境工程研究所辽宁省清洁能源重点实验室,沈阳110136 [2]大连理工大学能源与动力学院辽宁省海水淡化重点实验室,大连116024

出　　处：《太阳能学报》2013年第7期1125-1130,共6页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2011CB201500);国家自然科学基金(51176130);辽宁省高校学校优秀人才支持计划(LJQ2011015)

摘　　要：以麦秆灰和稻秆灰为研究对象,利用灰熔融实验和XRD、SEM等分析测试手段结合K的形态分布预测,考查碱金属K对秸秆成灰特性的影响。结果表明:麦秆灰和稻秆灰中K的主要存在形式分别为K2SO4和K2O·2SiO2。K含量增多对麦秆灰和稻秆灰中K2SO4、KAlSiO4、KAlSiO4(K)、KAlSi3O8含量的影响较小。K2CO3、K2O·2SiO2、K2O·SiO2的物质的量分数随K含量的增加而增多是诱发灰熔融特征温度下降的重要原因之一,此外它们与其他矿物质形成复杂的低熔点共熔物也对其起到重要作用。The form of potassium in ashes plays an important role in energy utilization and fusing characteristics of straw ashes. The effects of potassium on the ash characteristics of wheat and rice straw were studied by ash melting point apparatus, X-ray powder diffraction （XRD） and scanning electron microscope （SEM）. In addition thermo- dynamic equilibrium calculations were used to predict the morphology and distribution of potassium in solid phase and interpret the experimental results. It was found that K2SO4 and K2O·2SiO2 are the main form of wheat and rice straw ashes, respectively. It has little effect on the amount of K2SO4, KAlSiO4, KAlSiO4（K） and KA1Si3Osin wheat and rice straw ashes as increasing potassium content in fuels. Increasing molar fraction of K2O·2SiO2, K/CO3 and K2O·2SiO2 with potassium content increasing was one of important reasons that caused the reduction of ash fusion temperature. Meanwhile, it was related to the complex low melting point eutectic mixtures formed by K2O·2SiO2, K2CO3,K2O·2SiO2 with other minerals.

关 键 词：秸秆 钾 灰熔点 化学热力学平衡计算 

分 类 号：TK6[动力工程及工程热物理—生物能]