论文部分内容阅读
以某电厂480 t/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。100 MW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15×10~4 m3/h降低到14×104 m3/h时,飞灰含碳量降低约2%;风压从8 kPa升高到12 kPa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。
Taking a 480 t / h circulating fluidized bed boiler of a power plant as the research object, the effects of coal feeding characteristics, total air flow, primary air flow and pressure in the plenum on fly ash properties were discussed through experiments. The fly ash characteristics were analyzed microscopically. The experimental results show that the carbon content of fly ash has a peak value with the particle size distribution. When the particle size of fly ash is 37μm, the carbon content of fly ash reaches its maximum value. Under the 100 MW load, the carbon content of the fly ash decreased about 3% when the oxygen output from the economizer increased from 3.5% to 4.5%. The primary air volume was reduced from 15 × 10 ~ 4 m3 / h to 14 × 104 m3 / h , The carbon content of fly ash decreased about 2%; when the wind pressure increased from 8 kPa to 12 kPa, the carbon content of fly ash decreased about 4%. SEM results of the surface structure and pore structure of fly ash show that the pore characteristics of fly ash with different particle sizes have a gradual change characteristic which is consistent with the particle size distribution and carbon content distribution of fly ash.