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我厂现有两台锅炉,型号分别为 KZL2-8及DZL2-7,引风机出口管道直径为Φ300,两台锅炉各有一套鼓引风系统,引风机出口汇合后至一根Φ600的烟囱上,烟囱高30米,排烟温度140℃,见图1。 两引风机出口在A点相交,由于交角偏大且无导流板,所以当2~＃风机运行时,1~＃风机A点至出口闸门B点的管道内充满了含有灰份的烟气,温度达140℃。由于烟气不流通,冷却后变成水、煤灰,经密封不严的闸板流至风机叶轮室。时间一长,叶轮上积满了煤灰。当启用1~＃风机时,叶轮动平衡失控,阻力增大,产生振动,使噪音骤增,出力下降。在故障检修和日常检查时,发现风机房地面积水严重。打开引风机,发现叶轮室内积水漫至叶轮边缘。
I plant two existing boiler models are KZL2-8 and DZL2-7, induced draft fan outlet pipe diameter of Φ300, two boilers have a set of drum induced draft system, induced draft fan exports converge to a Φ600 chimney , Chimney 30 meters high, exhaust temperature 140 ℃, see Figure 1. Two draft fan outlet at point A intersection, due to the intersection angle is too large and no deflector, so when 2 ~ # fan running, 1 ~ # fan outlet point B to point B pipe filled with ash , Temperature up to 140 ℃. As the flue gas does not flow through, it becomes water and coal ash after cooling, and it flows to the fan impeller chamber through the imperfect gate. Over time, the impeller is full of ash. When enabled 1 ~ # fans, the balance of the rotor out of control, resistance increases, resulting in vibration, the noise surge, the output drop. During troubleshooting and daily inspection, it was found that the water in the fan room was serious. Open the induced draft fan and found that the impeller chamber water diffuse to the edge of the impeller.