600MW锅炉受热面调整降低排烟温度热力计算研究  

Thermodynamic calculation of various heating surface adjustments of a 600 MW boiler: Used to reduce the exhaust gas temperature

作　　者：刘龙龙[1] 陈云[2] 李雪峰[2] 况敏[1] 王智化[1] 周俊虎[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]浙江浙能北仑发电有限公司,浙江宁波315800

出　　处：《能源工程》2015年第5期57-62,共6页Energy Engineering

基　　金：国家重点基础研究发展计划项目(973计划)(2012CB214906)

摘　　要：某电厂1台600 MW亚临界机组锅炉经增容和低氮燃烧改造后存在排烟温度偏高的问题,为有效降低排烟温度同时尽量降低减温水量且不影响炉内燃烧状况,提出了对锅炉竖井烟道受热面进行调整的多个改造方案。为研究这些方案的可行性,采用自主开发的通用锅炉热力计算BESS软件对该锅炉进行了热力计算研究。结果表明,具备可行性的方案是将再热器侧和低温过热器侧的省煤器面积均在原有基础上增加66.7%,可降低排烟温度8~9℃、提高锅炉效率约0.36%,预计年运行成本节省约337万元。此外,针对这一方案对锅炉运行可能造成的各种影响进行了详尽的预判性评估。A 600 MW sub-critical boiler suffered from high exhaust gas temperatures after a series of retrofits including capacity increase and low-NOxcombustion. To effectively reduce the high exhaust gas temperature and desuperheating water flux while not affect the furnace combustion status,various heating surface adjustments in the vertical flue passage,which were characterized by replacing parts of low-temperature superheaters with low-temperature economizers and increasing additional low-temperature economizers at the bottom of the vertical flue passage,respectively,were proposed for the boiler. In order to evaluate the availability of these heating surface adjustment schemes,a developed thermodynamic calculation software BESS was used to carry out thermodynamic calculationsfor the boiler. Results showed that among these heating surface adjustment schemes,the one characterized by increasing additional low-temperature economizers（ whose heating surface equalled to 66. 7% of that of the original economizer） in the region below the reheater and low-temperature superheater could be taken as the sole,available solution. This solution could decrease the exhaust gas temperature by 8 ~ 9 ℃ and increase the boiler efficiency by 0. 36 percents. Accordingly,the estimated boiler operation cost could be saved by about 3. 37 million yuan per year. In addition,a detailed assessment of effects of this solution on the boiler operations was provided.

关 键 词：600 MW亚临界锅炉 排烟温度 竖井烟道 热力计算 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]