Zhundong has large coal reserves and low mining costs

making it the most economical fuel in the Xinjiang Zhundong region. However

Zhundong coal has strong slagging and fouling properties

which seriously restricts the safe and stable operation of boilers. Boilers in the Zhundong region usually require burning at least 20% low alkali coal

the low reserves and high prices of low alkali coal seriously constrain the cost reduction of power plants. In order to promote cost reduction

an experimental study on burning high ratio of Zhundong high alkali coal was conducted on the 350 MW unit boiler of Wucaiwan Power Plant. A collaborative optimization strategy was adopted to prevent and control slag and contamination on the heating surface of the boiler. This included adding kaolin to coal to regulate the composition of coal ash

and deeply optimizing the operating parameters of the pulverization system

combustion system

and soot blowing system. The test results show that the collaborative optimization strategy has solved the long-standing problems of large-scale slag flow on the water-cooled wall

clogging of the burner nozzle

and severe fouling of the convective heating surface of this type of boiler. The safety and load capacity of the boiler operation have been greatly improved

and the coal structure can be lastingly maintained as 92.5% Zhundong high alkali coal and 7.5% kaolin

with significant safety and economic benefits.