Xinjiang high-alkali coal is a cost-effective power coal

but when it is used in large proportions

boiler equipment is prone to severe slagging problems. The design principles of the combustion system for boilers using Zhundong coal are inconsistent with conventional technical measures to improve low-load stable combustion performance. To solve this problem

based on the mechanism of stable combustion of pulverized coal

measures such as optimized layout of tiny oil ignition burners

interlaced arrangement of middle layer burners

online adjustable coal powder concentration and burner design optimization have been studied. The technology was applied in a 350 MW unit's deep peak regulation retrofit project using Zhundong high-alkali coal as fuel

and achieved a stable combustion load of less than 18% rated condition without oil injection.