Abstract: From the angle of equipments, coal property and operators, the control modes have been optimized when the poorgrade coal is burned in the boiler of Yunnan Huadian Kunming Power Generation Corporation Limited. The boiler flameout faults were reduced, the abnormal fuel oil consumption was decreased; and the purposes of security and economical efficiency for the unit operation were reached.

Key words: poor-grade coal, operation adjustment, boiler flame-out, countermesure