空预器差压大的原因及处理

Causes and Treatment of Large Differential Pressure of Air Preheater

燃煤电厂超低排放后,氨逃逸量增加,造成空预器冷端硫酸氢氨腐蚀结晶,进一步造成积灰,导致空预器差压增大。随着新能源的大力发展,火电轮为调峰电源,长期低负荷和深度调峰操作,进一步导致空预器冷端低温腐蚀结晶的加剧。空预器差压的增大,不仅影响锅炉运行经济性,增加风机电耗,降低锅炉出力,更是给锅炉运行安全带来重大隐患。基于此,从多方面分析空预器差压增大的成因,并探索解决的途径。

After the ultra-low emission of coal-fired power plants,the amount of ammonia escape increases,resulting in the corrosion and crystallization of hydrogen sulfate ammonia at the cold end of the air preheater,further causing ash deposition and increasing the differential pressure of the air preheater.With the vigorous development of new energy,the thermal power wheel is the peak shaving power supply,and the long-term low load and deep peak shaving operation further aggravate the low-temperature corrosion and crystallization at the cold end of the air preheater.The increase of air preheater differential pressure not only affects the boiler operation economy,increases the fan power consumption and reduces the boiler output,but also brings major hidden dangers to the boiler operation safety.This paper analyzes the causes of the increase of air preheater differential pressure from many aspects and explores the solutions.