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1 事故发生经过我厂将SHL20—25/400型锅炉改造成循环流化床后,引风机接连出现了两次大的损坏事故。1995年9月11日10时30分,监盘人员发现引风机电流增高,经检查引风机轴承温度偏高,风机内有异常响声,遂减少引风开度。13时50分,引风机电流突然增大,接着又趋于正常。此种现象随后又发生了多次,至15日下午5时,运行人员发现引风机电流突增至满位,只听“嘭”的一声。待停炉检查,引风机机座地脚螺栓处已被振裂,叶轮盘从轮毂上甩出;1995年11月23日15时,
An accident occurred After I plant SHL20-25 / 400-type boiler into a circulating fluidized bed, induced draft fan has two major accidents. At 11:30 on September 11, 1995, monitoring staff found that induced draft fan current increases, the pilot fan bearing temperature is high, the fan has an abnormal noise, then reduce the induced draft. At 13:50, the induced draft fan current suddenly increased, and then tended to be normal again. This phenomenon then occurred again many times, at 15 o’clock on the on the 5th, the operator found that the induced draft fan current surge to full, just listen to the “嘭 ” sound. To be stopped furnace inspection, induced draft fan base bolts have been shattered, impeller disc thrown from the wheel; at 15 o’clock on the November 23, 1995,