循环流化床锅炉飞灰特性研究

CFB锅炉飞灰的化学成分以及物理特性和煤粉炉有所不同.研究讨论了CFB锅炉飞灰和煤粉炉飞灰的区别.在实验中发现CFB锅炉飞灰中SiO2、Al2O3、TFeO、CaO、MgO的含量随着粒度的变化而有规律地变化.随着粒度的减小,飞灰中SiO2的含量逐渐降低,而Al2O3、TFeO、CaO、MgO含量则逐渐升高.在实验的基础上对铁元素存在形式进行了理论上的分析,得出在CFB锅炉和煤粉炉的燃煤飞灰中,铁元素因为运行工况的不同其存在形式不同,进而呈现出颜色上的差异.CFB锅炉飞灰含碳量高,比电阻低.

Study on the Characteristics of Fly Ash from CFB

The element composition and the physical characteristics of fly ash from CFB boiler are different to the other kinds of boilers.The aim of the study was to discuss the distinctive features between the fly ash from CFB and the fly ash from pulverized coal fire boiler(PC boiler).The experiments show that the element composition from CFB and PC boiler has the some rule with the change of granularity.The carbon content of residua from CFB is higher than the content from PC boiler obviously.The SiO_2 content decreases with the granularity of residua fining,while the content of Al_2O_3,CaO,MgO has the reverse rule in despite of CFB or PC boiler.The content of TFeO of residua increases in CFB while the content decreases in PC boiler with the granularity of residua fining.And the component form of TFeO in CFB is mainly Fe_2O_3 while the component in PC boiler is mainly Fe_3O_4.The higher the content of carbon was,the lower the special resistance was.