In order to explore Zhundong ash deposition rules

the visualization of fly ash deposition test rig was used to study the deposition characteristics of Zhundong coal under different ashing temperatures. SEM-EDS

XRD and Particles Distribution Instrument were utilized to analyze ash particles. The results showed that the different ashing temperatures led to large differences in characteristics. Existence in the form of calcium is mainly CaCO3

CaSO4 at 500 ℃ and 650 ℃ cases

but CaO in the 800 ℃ case. At 800 ℃

NaCl is unable to be found in ash and Zhundong coal exists self-desulfurization. In terms of ash deposition characteristic

the 800 ℃ ash is the highest in fouling height because of larger diameter of particles. It is illustrated that the physical factors are the controlling factors at this experimental condition. The "uneven" phenomenon is also appeared at borders for 500 ℃ and 650 ℃ cases

because the particles form voids and are heated to become soft and easy to collapse. It is called "Boundary Roughening"

which may be important reasons of fouling and slagging in boilers.