摘要
基于对回转式空气预热器的性能计算,分析了3.5分仓空气预热器方式和设置封闭热风再循环分仓方式空气预热器的循环热风进入空气预热器转子后的温度变化情况和传热元件壁温的变化情况,得出2种方案都只能有限提高空气预热器冷端局部深度的壁温,在超出一定深度后传热元件壁温反而会下降,导致硫酸氢铵凝结堵灰区向空气预热器热端移动,因而不能解决空气预热器堵灰问题的结论。同时也指出,2种方式均存在导致空气预热器传热量下降的问题。最后给出了几点治理空气预热器堵灰的建议。
Based on performance calculation of rotary air preheater, an analysis about the element wall temperature was given by comparing a normal tri-sector air preheater with two type new methods: one is so-called 3.5 sector preheater with hot end leakage recycle system, the second is quad-sector design with a closed hot air circulating sector. Meanwhile the circulating hot air temperatures and heating element temperatures inside the rotor of two new methods were supplied. Both two methods can increase wall temperature only at the position which close to cold end in limit depth, above this area the wall temperature is lower than normal design, so the ABS condense area will be extended to hot end and these two ways cannot improve Air preheater’s plugging. These two methods will cause the heating exchanging amount decrease. Several suggestions about how to solve air preheater plugging were supplied at the end of this paper.
作者
蔡明坤
CAI Mingkun(Shanghai Boiler Works Co.,Ltd.,Shanghai 200245,China)
出处
《锅炉技术》
北大核心
2021年第S01期1-6,共6页
Boiler Technology
关键词
3.5风仓空气预热器
热风循环
壁温
硫酸氢铵堵灰
3.5 sector air preheater
closed hot air recycle sector
wall temperature
ABS plugging
