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某单位自备电厂1台75t/h循环流化床燃煤锅炉,安装后,其流化试验一直都不理想,使用中也未能带满负荷(最大负荷为60t/h),而且流化状况较差,负荷大的时候,还容易出现局部结焦的现象。由于最近两年用汽量增加较多,为了提高锅炉出力、改善流化状况、解决炉内局部结焦的问题,采取了减少通风截面以提高风速、改善流化状况、强化埋管换热的方法,用浇注料在布风板四周各封堵了三排,封堵数量约400个,占风帽总数的20%,同时对磨损严重的下排和中部埋管进行了更换。改造、维修后,流化状况有所改善,结焦问题基本解决,锅炉最大负荷约为70t/h。改造后运行6个月后即频繁发生爆管事故,爆管事故有时甚至间隔为2天,致使锅炉多次紧急停炉,给单位造成重大经济损失。
A unit owned by a power plant 75t / h circulating fluidized bed coal-fired boiler, after installation, the fluidization test has been unsatisfactory, also failed to bring full load (maximum load of 60t / h), and fluidized The situation is poor, when the load is large, but also prone to the phenomenon of partial coking. In order to increase the boiler output, improve the fluidization status and solve the problem of local coking in the furnace, a method of reducing the ventilation cross section to increase the wind speed, improving the fluidization condition and strengthening the heat exchange in the borehole management has been adopted because of the increase of the steam consumption in the recent two years , With casting material in the cloth around the block all three rows, blocking the number of about 400, accounting for 20% of the total number of hoods, while the wear of the lower row and the middle of the buried tube was replaced. After the renovation and maintenance, the fluidization status has been improved. The coking problem is basically solved. The maximum boiler load is about 70t / h. After the operation of transformation 6 months after the frequent burst pipe accident, burst pipe sometimes accidental interval of 2 days, resulting in boiler emergency shut down many times, causing significant economic losses to the unit.