2093t/h四角切圆锅炉燃烧器的数值优化及改进研究  

Numerical Optimization and Improvement Research on Burner in a 2093t/h Tangentially Fired Boiler

作　　者：吕太[1] 于战海[1] 程超[1] 丁帅[1] 许贺 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]国家电投河南电力有限公司技术信息中心,河南郑州450001

出　　处：《东北电力大学学报》2016年第5期32-38,共7页Journal of Northeast Electric Power University

摘　　要：针对某2093 t/h四角切圆燃烧锅炉炉膛出口左右两侧烟温偏差过大、氮氧化物排放浓度偏高的问题,分析了产生烟温偏差的原因,根据计算结果对锅炉燃烧器提出了采用SOFA风反切圆消除残余旋转的改造措施,同时利用空气分级燃烧技术降低NOx的排放。改造后SOFA风率为25%工况下,对比分析了锅炉燃烧器改造前后额定工况下燃烧过程中炉膛温度场、特征组分分布及NOx排放和不同的SOFA风反切角度对炉膛出口烟温偏差的影响。结果表明,适宜的SOFA风反切角度可以有效地减小烟温偏差,空气分级燃烧能够降低主燃区的温度,以降低NOx生成,炉膛出口NOx排放浓度降幅为31.6%,以上结论可作为同类型机组设计和改造时参考。Against the serious problem of flue gas temperature deviation was too large between two sides at fur- nace exit and NOx emission concentration was so high in a 2093t/h tangentially fired boiler,the reasons resul- ted in flue gas temperature deviation were analyzed through the numerical calculation. Modification measures of using the reversed tangential SOFA to eliminate residual rotation are proposed based on the results of calcula- tion. At the same time, the air staged combustion technology was used to reduce NOx emissions. Under the con- dition of 25% sofa rate after transformation, the temperature field in furnace, distribution of proper components, as well NOx emission were analyzed contrastively before and after the modification on burners. In addition, different reversed tangential SOFA angles on flue gas temperature deviation at furnace outlet were an- alyzed. Results show that, the appropriate reversed tangential angle of SOFA can effectively reduce the deviation of flue gas temperature,the air-staged combustion technology can keep the furnace temperature in a low level which can inhibit the formation of NOx. NOx emission concentration decreased 31.6% at furnace ex- it. This modification scheme can provide reference for the design and innovation of this type of boiler.

关 键 词：烟温偏差 四角切圆锅炉 残余旋转 数值模拟 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]