采用缝隙式燃烧器的W火焰锅炉燃烧调整试验研究  

Combustion Adjustment of a W-flame Boiler with Slot Burners

作　　者：王克[1] 周文台[1] 何翔[1] 施鸿飞[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《动力工程学报》2017年第1期1-6,共6页Journal of Chinese Society of Power Engineering

摘　　要：针对某电厂采用缝隙式燃烧器的W火焰锅炉高负荷下存在的飞灰含碳量高、屏式过热器超温严重、侧墙结渣严重、排烟温度过高及炉膛前后墙出现偏烧等问题,对锅炉的配风方式和炉膛出口氧体积分数等进行燃烧调整,并提出了相应的优化运行方式.结果表明:优化后的运行方式为中间二次风开度控制在85%,两侧二次风开度控制为90%,三次风开度减小到40%,内二次风保持原工况不变,外二次风开度增大至50%,炉膛出口氧体积分数控制在3%~3.5%,乏气缩孔开度关小至30%;优化后过热器超温问题得到解决,飞灰含碳质量分数降低了7.5%左右,排烟温度降低了8K左右,锅炉效率达到设计值,燃烧经济性显著提高,有效缓解了侧墙结渣和前后墙偏烧的程度.To solve the problems of high carbon content in fly ash, serious overtieating of platen superheat- ers, severe slagging on side walls, high exhaust temperatures, bias combustion on front and rear furnace walls occurring at high load condition of a W-flame boiler with slot burners, combustion optimization was performed for the boiler by adjusting the air distribution and outlet oxygen concentration, and subsequent- ly an optimized operation mode was proposed. Results show that above problems can be effectively solved with fly ash carbon content reduced by 7.5 ~, exhaust temperature reduced by 8 K, boiler efficiency meet- ing the design requirement and with combustion economy improved remarkably, in the optimized operation mode, such as controlling the damper openings of middle secondary air, side secondary air, tertiary air and external secondary air to be at 85%, 90%, 40% and 50%, respectively, while the internal secondary air damper is kept unchanged, furnace outlet oxygen volumetric fraction kept within 3%-3.5%, and the ex- haust vent reduced to 30%.

关 键 词：W火焰锅炉 缝隙式燃烧器 燃烧调整 结渣 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]