四角切圆锅炉的二次风喷口结构优化及应用
Study on Optimization and Application of Secondary Air Spout Structure in Corner Tangential Boiler
魏占海 1李卫科1
作者信息
- 1. 山西大唐国际临汾热电有限责任公司,山西临汾 041000
- 折叠
摘要
300 MW发电机组配备的四角切圆锅炉在深度调峰工况下存在脱硝入口 NOx值居高不下、锅炉两侧汽温偏差大、在高负荷工况下水冷壁存在较严重的高温腐蚀等一系列问题,经分析四角切圆锅炉结构特点及左右两侧屏式过热器、屏式再热器的壁温偏差及低负荷时二次风与炉膛压差等运行参数,判断为锅炉二次风配风性能差导致锅炉燃烧动力场偏离设计值.将部分二次风喷口面积局部缩小且辅助风喷口沿炉膛切圆方向偏转7.5.后,锅炉在深度调峰工况下主热、再热汽温分别提升13℃、9℃,左右两侧脱硝入口 NOx值平均下降162 mg/m3,空预器入口氧量未发生降低,这表明优化的二次风喷口结构可有效提升锅炉性能.
Abstract
There are a series of problems such as high NOx value of denitration inlet,large deviation of steam temperature on both sides of boiler and serious high-temperature corrosion of water wall under high load condition in the corner tangential boiler equipped in 300 MW generator set under the condition of deep peak regulation.Based on an analysis of the structural characteristics of the corner tan-gential boiler,operating parameters such as the wall temperature deviation of the left and right side of the screen superheater and the screen reheater,and the secondary air and furnace pressure difference under low load,it is concluded that the poor secondary air distribu-tion performance of the boiler causes the boiler combustion power field to deviate from the design value.After the area of some secondary air vents is partially reduced and the auxiliary air vents are deflected 7.5° along the furnace tangent direction,the main heat and reheat steam temperature of the boiler are increased by 13℃ and 9℃ respectively under the deep peak load condition,the NOx at the left and right side of the denitration inlet decreases by 162 mg/m3 on average and the oxygen intake of air preheater does not decrease.These show that the optimized secondary air spout structure can effectively improve the boiler performance.
关键词
锅炉/二次风喷口/动力场性能/高温腐蚀/燃烬风/深度调峰Key words
boiler/secondary air spout/dynamic field performance/high-temperature corrosion/ember air/deep peak regulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据