TY - JOUR
TI - Influence of operating conditions on ammonium bisulfate deposition in the rotary air preheater of coal-fired power plants
AU - Wang Limin
AU - Bu Yufan
AU - He Yang
AU - Tang Chunli
AU - Deng Lei
AU - Che Defu
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 1251
EP - 1262
PT - Article
AB - To achieve the maximum NOx reduction in coal-fired power plant, excess  ammonia is injected into the selective catalytic reduction reactor, which  leads to the formation of ammonium bisulfate due to the reaction between  ammonia escaping from the selective catalytic reduction reactor and sulfur  oxides in the flue gas. Ammonium bisulfate can condense in the rotary  regenerative air-preheater, which would adversely affect the safe and  efficient operation of the air-preheater. An improved Radian number is  proposed to estimate the ammonium bisulfate deposition. The operating  conditions or modes of the air-preheater, i.e., rotating speed, air flow  bypass, cold-end protection and different splitting fluid sector  arrangements, are comparatively studied to analyze the temperature and  ammonium bisulfate deposition distributions. To decrease the rotating speed  is not a reasonable method for the plugging problem of the air-preheater.  The hot air recirculation is not helpful to mitigate the ammonium bisulfate  deposition in medium matrix layer. The splitting gas sector arrangement  would cause more serious plugging problem, but the splitting air sector  arrangements can alleviate the ammonium bisulfate deposition. To increase  the air bypass rate is more effective than the splitting air sector  arrangements to alleviate the plugging problem. The improved Radian number  is more reasonable to reflect the ammonium bisulfate deposition compared  with the original Radian number.