摘要
为了解决660 MW机组锅炉配置单列大型空气预热器时存在的两侧排烟温度偏差大、冷端易堵塞、热一次风温度偏低问题,开展变换空气预热器旋转方向和提高转速的研究。结果显示:空气预热器旋转方向对热一次风温度具有明显影响;调整旋转方向且换热元件先预热一次风时,高负荷下的热一次风温度提高量超过50℃,提升了制粉系统干燥出力;空气预热器旋转速率对排烟温度及两侧偏差具有明显影响,将旋转速率自0.6 r/min提高至1.0 r/min,高负荷下两侧排烟温度偏差降低量超过15℃,整体排烟温度降低量超过8℃。通过改变转向和提高转速,空气预热器的运行特性得到大幅度优化。
In order to solve the problems of large deviation of exhaust temperatures at left and right sides, easy blockage of cold end and insufficient temperature of hot primary air, the research of changing rotation direction and increasing the speed of air preheater were carried out. The results show that the rotation direction of air preheater has an visible influence on temperature of hot primary air. After adjusting the rotation direction, the primary air is preferentially preheated by heat exchange surface, which increases the temperature of hot primary air by more than 50 ℃, so as to improve the drying output of pulverizing system. The rotation rate of air preheater has an visible influence on exhaust gas temperatures at left and right sides. By increasing the rotation rate from 0.6 r/min to 1.0 r/min, the exhaust gas temperature deviation is reduced by more than 15 ℃ and the overall exhaust gas temperature is reduced by more than 8 ℃. By adjusting the rotating direction and rotating speed, the operating characteristics of air preheater are greatly optimized.
作者
杨兆兵
张文涛
张世权
郭洋洲
YANG Zhao-bing;ZHANG Wen-tao;ZHANG Shi-quan;GUO Yang-zhou
出处
《节能》
2022年第9期38-41,共4页
Energy Conservation
关键词
空气预热器
旋转方向
转速
排烟温度
一次风温度
air preheater
rotation direction
rotation speed
exhaust temperature
primary air temperature
