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导致姚孟电厂2号炉排烟温度偏高的一个重要因素是运行时掺入制粉系统和一次风的冷风量偏大,减少了经过空气预热器的热风量。在增加磨煤机再循环风管的同时缩小一次风管径,使进入炉膛的冷风量减少了8.12%(总风量)。经过计算,预测排烟温度因此可以降低13℃,实际改造后排烟温度降低了15.1℃,锅炉效率提高了0.823%。
An important factor that leads to the high exhaust gas temperature of furnace No. 2 in Yao-Meng Power Plant is that the amount of cold air mixed into the pulverizing system and the primary air during operation is too large, which reduces the amount of hot air passing through the air preheater. Reducing the diameter of the primary air duct while increasing the pulverizer recirculation duct reduced the amount of cold air entering the furnace by 8.12% (total air volume). After calculation, the temperature of the exhaust gas can be predicted to be reduced by 13 ℃. After the actual conversion, the temperature of the exhaust gas is reduced by 15.1 ℃ and the boiler efficiency is increased by 0.823%.