An investigation of sodium transformation in Zhundong coal during pyrolysis

There is a high sodium content in Zhundong coal, which result in equipment corrosion, fouling and slagging during coal combustion and gasification. We use sequential extraction and pyrolysis experiment to investigate the transformation of sodium in Zhundong coal during pyrolysis. Preliminary experimental results show that 60~70 percent of the sodium in Zhundong coal exists in the form of water soluble sodium. The existing forms of sodium in coal changed after pyrolysis, the release of sodium in the temperature lower than 700℃ are organic sodium, soluble sodium in raw coal and water washed coal would transform to insoluble sodium as the temperature rise. © 2015, Science Press. All right reserved.