干排渣漏风优化对某600 MW锅炉性能的影响  

Influence of Dry Slag Discharge Air Leakage on 600 MW Boiler Performance

作　　者：童家麟 吕洪坤 刘文胜 蔡文方 叶学民[2] TONG Jialin;L Hongkun;LIU Wensheng;CAI Wenfang;YE Xuemin(Electric Power Research Institute of State Grid Zhejiang Electric Power Company,Hangzhou,Zhejiang 310014,China;Department of Power Engineering,North China Electric Power University,Baoding,Hebei 071003,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,浙江杭州310014 [2]华北电力大学动力工程系,河北保定071003

出　　处：《广东电力》2022年第7期41-47,共7页Guangdong Electric Power

基　　金：国网浙江省电力有限公司科技项目(B311DS221009)。

摘　　要：干排渣漏风会对锅炉低负荷运行性能产生诸多不利影响,针对此,提出用净烟气取代环境空气的干排渣优化冷却方式。采用数值模拟方法比较采用干排渣优化冷却方式前后各典型负荷下漏风对锅炉温度场、燃尽率、NO_(x)生成量等的影响。结果表明,采用干排渣优化冷却系统后,在相同锅炉负荷和干排渣漏风量下,燃烧器区域烟气温度、煤粉燃尽率、炉膛出口NO_(x)体积分数均有所改善,在低负荷下效果更为明显,同时锅炉排烟温度可保持不变,可显著提高锅炉低负荷运行性能。但大量干排渣冷却风漏入时,炉内整体温度水平仍有明显降低,特别对中下层燃烧器层的稳燃能力影响较大。此外,也可能产生系统总能耗上升、净烟气风机和炉内受热面磨损等不利影响。Dry slag discharge air leakage exerts many adverse effects for boiler low load operation performance, thus, this paper proposes an optimized dry slag discharge cooling way replacing ambient air by net gas replacing. The numerical simulation is employed to compare the influence of air leakage on temperature field, burn-off rate, NO_(x) production at typical loads before and after air leakage optimization. The results indicate that flue gas temperature of burner layer, combustion loss and NO_(x) volume fractions at the furnace could be improved at the same boiler load and dry slag discharge air leakage, and the effects are obvious at low load. Meanwhile, the boiler exhaust temperature remains unchanged, which can significantly improve low load operation performance of the boiler. The temperature of furnace decreases after dry slag discharge cooling air leak-in, especially for middle and lower burner layers. Furthermore, some negative effects such as total system energy consumption increase, clean flue gas fan and heating surface wearing may be produced also.

关 键 词：干排渣 优化冷却 漏风 温度场 燃尽率 NO_(x) 排烟温度 数值模拟 

分 类 号：TM621.73[电气工程—电力系统及自动化] TK227.3[动力工程及工程热物理—动力机械及工程]