480 t/h循环流化床锅炉飞灰特性的试验研究  

Experimental Study of the Fly Ash Characteristics of a 480 t/h Circulating Fluidized Bed Boiler

作　　者：刘兴国[1] 张宗珩 刘海玉[1] 金燕[1] 

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024 [2]中煤平朔电力工程有限公司,山西朔州036800

出　　处：《热能动力工程》2013年第3期262-266,324,共5页Journal of Engineering for Thermal Energy and Power

基　　金：教育部高等学校博士学科点专项科研基金资助项目(20101402110011);国家自然科学基金资助项目(51206116)

摘　　要：以某电厂480t／h循环流化床锅炉为研究对象，通过试验探讨了给煤特性、总风量、一次风量和风室压力对飞灰特性的影响，并对飞灰特性进行了微观分析。试验结果表明：飞灰含碳量随粒径分布具有峰值特性，当飞灰粒径为37μm时，飞灰含碳量达到最大值。100MW负荷下，当省煤器出口氧量从3．5％增加到4．5％时，飞灰含碳量降低约3％；一次风量从15×10^4m^3／h降低到14×10^4m^3／h时，飞灰含碳量降低约2％；风压从8kPa升高到12kPa时，飞灰含碳量降低约4％。SEM对飞灰表面结构和孔隙结构的表征结果表明：不同粒径段飞灰孔隙特征具有渐变特性。与飞灰粒径及含碳量分布特性相吻合。With a 480 t/h circulating fluidized bed boiler serving as the object of study,through various tests,investigated was the influence of coal feed characteristics,total air quantity,primary air quantity and the pressure in the air chamber on the flying ash characteristics and microscopically analyzed were the flying ash characteristics.The test results show that the carbon content of the flying ash will exhibit the peak value characteristics with the distribution of the particle diameters and when the particle diameter of the flying ash is 37 μm,the carbon content of the flying ash will attain its maximum value.At a load below 100 MW,when the oxygen content at the outlet of the economizer increases from 3.5% to 4.5%,the carbon content of the flying ash will decrease by about 3%.When the primary air quantity decreases from 15 × 10~4 m 3/h to 14 × 10~4 m 3/h,the carbon content of the flying ash will decrease by around 2%.When the air pressure goes up from 8 kPa to 12 kPa,the carbon content of the flying ash will decrease by about 4%.The characteristic results of the surface structure and pore structure of the flying ash obtained by using a scanning electronic microscope(SEM) show that the pore characteristics of the flying ash in various particle diameter sections display gradual change characteristics,which is in agreement with the particle diameters and carbon content distribution characteristics of the flying ash.

关 键 词：循环流化床锅炉 运行参数 飞灰 粒径分布 孔隙结构 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]