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我厂一期工程安装的两台上海锅炉厂生产的SG420/13.7-M419锅炉是国内首家燃烧无烟煤的420t炉。运行中逐渐暴露出一些问题,一次风煤粉管道膨胀节易出故障就是一例。 上海锅炉厂的产品是套筒式膨胀节,它由进口、出口端管和直管段组成。直管段一端焊接在进口端管上,并外套在出口端管上。直管段与出口端管之间用填料密封,以确保膨胀位移时不漏。它的特点是结构简单、价格低廉,但能承受的工作压力和温度低。由于无烟煤粉的一次风温为380℃左右,各种填料都不能确保膨胀节密封,使大量的煤粉泄漏飘浮在锅炉四周。
The SG420 / 13.7-M419 boiler produced by two Shanghai Boiler Plants installed in the first phase of our plant is the first 420t furnace burning anthracite in China. Gradually exposed some problems during operation, a coal-fired duct expansion joints prone to failure is an example. Shanghai Boiler Works is a sleeve expansion joint, which consists of import, export pipe and straight pipe composition. One end of the straight pipe is welded to the inlet pipe and the jacket is on the outlet pipe. Between the straight pipe and the outlet pipe sealed with packing to ensure that the expansion of the displacement does not leak. It is characterized by simple structure, low price, but can withstand the pressure of work and low temperature. Since the primary air temperature of anthracite powder is about 380 ℃, all kinds of packing can not ensure the expansion joint sealing, so that a large amount of pulverized coal leaks around the boiler.