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一、概述我厂是一个燃用劣质煤的高中压电厂,近几年来主要运行四台锅炉,其主要参数见表1。由于燃煤灰份高达55％以上,热值低至2800Kcal/kg左右,致使锅炉尾部受热面磨损十分严重,尤其是省煤器的磨损爆管事故频繁发生。1981年投产的300t/h炉仅运行7000小时就发生了省煤器磨损爆破。1983年一年中该炉高温省煤器爆管8次,于1984年5月改造,该组省煤器使用寿命为23000小时。7号炉低温省煤器运行至1986年5月大修时,因磨损爆管已堵掉1/4管排。8号炉省煤器从投产到上、下组管换新,使用寿命为19000小时。两台130
I. Overview Our factory is a high and medium voltage power plant burning with low quality coal. In recent years, it mainly runs four boilers, the main parameters of which are shown in Table 1. As coal ash as high as 55%, low calorific value to 2800Kcal / kg or so, resulting in boiler tail heating surface is very serious wear and tear, especially economizer wear and tear burst tube accidents occur frequently. Economizer blasting occurred in a 300 t / h furnace put into operation in 1981 for only 7000 hours. One year in 1983, the high-temperature economizer pipe squirting burst 8 times, in May 1984 transformation, the group economizer life of 23000 hours. No.7 furnace low temperature economizer operation to May 1986 overhaul, because of wear and tear pipe has blocked 1/4 pipe. No.8 furnace economizer from put into operation, the next set of tube replacement, the service life of 19,000 hours. Two 130