350MW煤粉锅炉低氮燃烧改造与参数优化设计  

Retrofit on Low-NO_x Combustion of a 350 MW Pulverized Coal-fired Boiler and the Parameters Optimization

作　　者：程怀志 文雷 宋正昶[2] 

机构地区：[1]徐州燃控科技股份有限公司,江苏徐州221004 [2]中国矿业大学电力工程学院,江苏徐州221008

出　　处：《动力工程学报》2015年第9期704-708,共5页Journal of Chinese Society of Power Engineering

摘　　要：对某350 MW煤粉锅炉的低氮燃烧改造方案进行分析,采用数值模拟方法研究了不同工况下气流的速度场、炉膛温度场和NOx排放质量浓度,并与实测结果进行了对比.结果表明:延长并调整旋流燃烧器二次风的扩锥可降低NOx的排放质量浓度;改变燃尽风喷口结构,增大燃尽风风量,使主燃区总体处于还原性气氛,既有利于NOx的还原,又能有效控制炉膛出口烟气温度,缓解屏底结焦状况;数值模拟结果与实测结果吻合较好.An analysis was performed to the retrofit schemes for low-NO, combustion of a 350 MW pulver- ized coal-fired boiler, while numerical simulations were conducted to study the gas velocity field, in-furnace temperature field and the N0~ emission under different working conditions, following which the simulation results were compared with actual measurements. Results show that the NO. emission may be reduced by extending and regulating the secondary air cone of swirl burner; to facilitate the NOt reduction, enhance the flue gas temperature control at furnace outlet and to relieve the coking status, it is recommended to change the structure of over fire air （OFA） nozzle and increase the OFA flow rate, so as to keep the main combustion zone in the reduction atmosphere. The simulation results are proved to agree well with acutal measurements.

关 键 词：煤粉锅炉 低氮燃烧改造 NOX排放 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]