In order to improve the safety of Zhundong coal boilers blending with low-sodium coal or kaolin

and give a definite blending principle

this article analyzes the coal quality of Zhundong coal

low-sodium coal and kaolin

and investigates the quality characteristics of boiler design coal and coal as fired for nearly 30 units blending with Zhundong coal. Combining with the slagging and fouling performance test results of Zhundong coals in different mining areas by one-dimensional flame furnace and coal ash sintering ratio test

the key coal quality indexes which affect the safety operation of Zhundong coal-fired boiler are obtained. The results show that

the key coal quality indexes such as w(Na_2O)

w(Fe_2O_3)

w(Ca O)

B

B/A×w(Na_2O) of coal ash must be controlled within a certain range to ensure the safety operation of Zhundong coal boiler(w(Na_2O)≤4%; w(Fe_2O_3)≤10% or w(Fe_2O_3)≤8% when w(CaO)15%; w(CaO)≤20%

B≤36%

B/A×w(Na_2O)≤2.3). For XY power plant boiler

short-term full load operation can consider using the Zhundong coal mixture 2

then is Zhundong coal mixture 1. At unit load lower than 80% and 70%

the Zhundong coal mixture 3 and Zhundong coal mixture 4 can be considered. It is suggested that premixing and burning should be adopted to better prevent the slagging and contamination.