600MW燃煤机组锅炉大比例掺烧褐煤的设备改造

Equipment Modification of a 600MW Coal-fired Boiler Mixing-dilution Burning With Lignite at a Large Proportion

褐煤内水分大、热值低,大量掺烧会出现磨煤机干燥出力不足等一系列问题,严重影响制粉系统的安全运行。通过对空预器改转向、扩风仓、安装软密封及磨煤机喷嘴环扩容等进行一系列改造,使磨煤机入口风温进一步提高、磨煤机干燥研磨出力明显增加、风机阻力下降,在满足锅炉大比例掺烧褐煤要求的同时还可降低风机与磨煤机电耗、减少一次风机失速的危险,为企业带来巨大的经济效益,可为掺烧褐煤的火电厂提供一定的借鉴。

Due to a big water content and low heating value of lignite,its mixing-dilution combustion in a large amount may emerge an insufficient drying capacity of the coal mill and a series of problems and seriously influence the safe operation of the pulverized coal milling system.Through a series of modification such as rotation direction change,air chamber enlargement,soft seal installation and capacity enlargement of the nozzle ring of the coal mill,the air temperature at the inlet of the coal mill was further enhanced,the drying and milling capacity of the coal mill was conspicuously increased and the resistance of the blower was lowered.At the same time of meeting the requirements for mixing-dilution burning with lignite at a large proportion,the power consumption rate of the blower and coal mill can be reduced and the risk of the primary air blower starting to stall can be reduced,thus bringing huge economic benefits to the enterprise and providing certain reference for thermal power plants mixing-dilution burning with lignite.