Zhundong coal ash contains high content of sodium and calcium

which leads to serious slagging and contamination. On the basis of analyzing the coal quality characteristics and operation performance of 600 MW level boiler firing Zhundong coal with different furnace types and combustion modes

suggestions are given on the selection of key parameters such as furnace type and combustion mode of large-scale boiler firing Zhundong coal.Moreover

the specific operation and optimization measures are put forward from the aspects of kaolin mixing combustion

slag dryer design and intelligent soot blowing control. There is little difference in the operation economy and environmental protection for large scale boilers firing high sodium coal when using different furnace types and combustion modes

but the tower furnace has obvious advantages when burning low-ash high sodium coal. It suggests that the design of newly built unit should be improved according to the particularity of high alkali coal

and the goal of economic and safe combustion of Zhundong coal will be realized by means of inward moving of heating surface

optimization of slag removal system and integrated design of kaolin addition system.