为了保持受热面的清洁,降低排烟温度以提高燃气低氮锅炉热效率,受热面,主要是对流受热面要定期除灰。因为燃气低氮锅炉热效率提高,如维持锅炉蒸发量不变,送入炉膛的燃料量减少,燃气低氮锅炉炉膛出口的烟气温度和烟速降低,过热器的吸热量因传热温差和烟气侧的放热系数降低而减少,造成过热汽温下降。如保持燃料量不变,则炉膛出口烟气温度和烟速不变,由于蒸汽流量增加,单位质量蒸汽的吸热量减少,使过热器出口汽温下降。因此,对流受热面除灰,无论是维持蒸发量不变还是保持燃料量不变,均使汽温下降。

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