风量分切防堵灰技术在回转式空气预热器的研究与应用

通过分析空预器低温腐蚀和堵灰的形成机理,提出运用空预器风量分切防堵灰技术,在空预器转子进入空气侧之前增设循环风道,使部分高温烟气通过循环风道从空预器冷端直接流入空预器来改善空预器内蓄热元件的温度分布,防止硫酸液滴凝结和硫酸氢铵板结,为通过物理吹扫清除硫酸氢铵提供必要条件.并运用Fluent数值模拟软件分析了空预器风量分...

A Study on the Application of the Air Quantity Cutting Anti-Ash Blockage Technique in the Rotary Air Preheater

This paper analyze the causes of the low-temperature corrosion and ash blockage of the air preheater.With the application of the air quantity cutting anti-ash blockage technique,the circulating air duct can be added before the rotor of the preheater enters the air side.Then,some high-temperature flue gas can enter the air preheater from its cold side through the circulating air duct,to improve the temperature distribution of its internal thermoelements and prevent the condensation of sulfuric acid and hardening of ammonium bisulfate,which is necessary for clearing ammonium bisulfate by means of physical blowing.With the help of the Fluent numerical simulation software,the temperature distributions of the thermoelements before and after the application of the technique can be analyzed.The operating data of the air preheaters of two boilers in Chongqing Hengtai Power Generation Co.,Ltd.before and after the technical renovation verify the feasibility and effectiveness of the technique.