Citation: HAN Ke-xin, HUANG Zhen-yu, WANG Zhi-hua, ZHOU Jun-hu. Action mechanism of sodium compounds in Zhundong coal ash on the process of sintering and fusion[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(1): 22-26. shu

Action mechanism of sodium compounds in Zhundong coal ash on the process of sintering and fusion

1.
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding author: HUANG Zhen-yu,
Received Date: 25 June 2014
Available Online: 26 September 2014
Fund Project: 国家重点基础研究发展规划(973计划, 2012CB214906). (973计划, 2012CB214906)

Na₂CO₃ was added into coal ash with the amount of 20% which was converted into the weight of Na₂O. Then the mixed coal ash samples were sintered under different temperatures. To explore the transition mechanism of sodium compounds in the sintering process, the EDS elemental analysis method and XRD phase analysis method were used to analyze the sintered ash samples. Then chemical thermodynamic equilibrium calculations were carried out on the basis of EDS analysis results with the Equilib module of the Fact sage 5.2 software. And the results were compared with those of the experiment. Results show that sulfur enrichment will occur as the elevating of temperature. Sodium mainly reacts with sulfur to compose Na₂SO₄. At the same time NaCl occurs, and it will react with the potassium compounds to generate KCl. NaCl, KCl and Na₂SO₄ react with other substances to produce low temperature eutectics.
- Zhundong coal,
- sintering,
- sodium compounds,
- XRD
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