Citation: SHEN Ming-ke, QIU Kun-zan, HUANG Zhen-yu, WANG Zhi-hua, LIU Jian-zhong. Influence of kaolin on sodium retention and ash fusion characteristic during combustion of Zhundong coal[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(9): 1044-1051. shu

Influence of kaolin on sodium retention and ash fusion characteristic during combustion of Zhundong coal

1.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Corresponding author: QIU Kun-zan,
Received Date: 12 April 2015
Available Online: 3 July 2015
Fund Project: 国家重点基础研究发展规划(973计划, 2012CB214906)。 (973计划, 2012CB214906)

The common clay mineral of kaolin was selected as an additive into Zhundong coal during combustion. Sodium retention rates and coal ash fusion temperatures were investigated at different blending ratios and temperatures. XRD and ternary phase diagram were used to identify mineral transformations at high temperatures. The results show that the sodium retention rates increase rapidly with blending ratio from 0~2%, slowly from 2%~5% and decrease slightly with increasing temperature. The ash fusion temperatures of coal blended with additive initially decrease slowly, then decrease rapidly and finally increase with increasing blending ratio, reaching about 1 200 ℃ at 3%. The results of XRD and ternary phase diagram analysis show that the change of ash fusion temperature is due to the mineral content changes of rankinite, gehlenite and anorthite. The lowest ash fusion temperatures at the blending ratios of 3%and 4% are mainly caused by the low temperature eutectic phenomenon. The sodium retention rate reaches more than 60% and ash fusion temperature reaches about 1 300 ℃ at blending ratio of 2%, which is conductive to solid-state slag-tap boiler. The ash fusion temperature is about 1 200 ℃ at blending ratio of 3.0~4.0%, which is suitable for liquid-state slag-tap boiler.
- Zhundong coal,
- kaolin,
- sodium retention rate,
- ash fusion temperature,
- eutectic phenomenon
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