MVM25R型磨煤机辊套断裂原因分析

CAUSE ANALYSIS OF ROLLER-CASING BREAKAGE FOR MVM25R TYPE COAL PULVERIZER

珠海电厂一期 2台 70 0MW机组锅炉所配置的MVM2 5R磨煤机的 7个辊套未到设计寿命 120 0 0h便先后发生断裂。断裂口宏观分析、金相检验表明 ,辊套的断裂主要是由于制造工艺缺陷所致。对此 ,改进了辊套的制作工艺 。

Seven roller-casings of MVM 25R type coal pulverizers allocated to boilers of two units in Zhuhai Power Plant have been broken early or later before reaching the designed service-life of 12000h. The macrostructure analysis and the metallographic examination of broken surface show, the main cause of the roller-casing breakage is the bad quality of manufacture. In order to prevent the roller-casing from breakage, the technology of manufacturing roller-casings has been improved, and the hydrculic oil pressure applied on rollers being readjusted.