The No2 unit(6701/H, 200MW) at Hebi Wanhe Power Generation Co Ltd., was put into use in 1992 This is a coal-fired boiler with tangential fired method The design coal is Hebi lean coal To stabilize the combustion without oil at low load, eight original designed burners placed to No 2 and 3 level on the NO2 boiler were replaced with the controllable pulverized rich/leab ones developed by the Institute for Thermal Power Engineering(ITPE) of Zhejiang University The practice of successive operation shows that stable combustion can be achieved at 50% load without support oil, even at he combustion without oil at low load, eight original designed burners placed to No 2 and 3 level on the NO2 boiler were replaced with the controllable pulverized rich/leab ones developed by the Institute for Thermal Power Engineering(ITPE) of Zhejiang University The practice of successive operation shows that stable combustion can be achieved at 50% load without support oil, even at