Because of unstable quality of the incoming coal sorts

it is necessary frequently to burn admixture of different coal sorts in utility boilers. The feasibility of admix-burning different coal sorts and its influence upon operation behavior of the boiler in thermal power plant subordinated to Jiuquan Steel and Iron Corp have been analysed and evaluated from two aspects

hamely coal quality characteristics and features of the boiler equipment

and practical boiler test results being given. It is recommanded that the best ratio of admix-burning high calorific value coals in the said power plant should be lower than 50%

and the R_(90) value has to be reduced from 20% at present to about 14%~18%.