In recent years, the discovery of a large number of low-ranking Zhundong Coalfield in the Junggar Basin in western China hasattracted extensive attention from scholars. The Zhundong Coalfield is the largest whole coal field discovered in China, with proven reservesof more than 390 billion tons, enough to supply China′s coal consumption for nearly 100 years. Zhundong coals, characterized by low ash,low sulfur, high reactivity, large reserves and easy exploitation, is a high-quality fuel for future coal chemical industry and coal powerprojects. However, the content of alkali metal sodium in Zhundong coals is relatively high, and sodium is easy to volatilize during combustion, resulting in a series of problems such as boiler fouling and slagging, especially sodium chloride and sodium sulfate migrationwill cause a series of ash-related problems, a serious constraint on the large-scale, efficient and clean utilization of Zhundong coal. Thus,the distribution and coal quality characteristics of Zhundong coals, as well as the occurrence and measurement methods of sodium contentwere reviewed in detail. The internal and external migration mechanism of sodium and the effects of inorganic elements such as aluminosilicate, chlorine, calcium and potassium in coal on sodium migration were highlighted. The effects of reaction conditions such as temperature, pressure, atmosphere, particle size and additives on sodium migration were comprehensively reviewed. Although a number of studiesincluding experiments, heat balance calculation and simulation have been carried out, the ash-related problems caused by alkali metal release have not been solved, and the understanding of the causes is not comprehensive enough. Therefore, the focus of this study is to review the research progress and reveal the mechanism of sodium migration.
Research progress of sodium migration and transformation duringcombustion of Zhundong coals in China
2023 No. 10
853
317
Authors:
- MA Rui
- WEI Bo
- FAN Weidong
- YAO Qiang
- TAN Houzhang
- YAO Hong
- ZHU Quan
- WU Xiaojiang
- KONG Chengdong
- MA Xiaojing
Unit:
- School of Electrical Engineering,Xinjiang University
- School of Mechanical and PowerEngineering,Shanghai Jiao Tong University
- State Key Laboratory of Chemistry and Utilization ofCarbon Based Energy Resources,Xinjiang University
- Key Laboratory of Coal CleanConversion & Chemical Engineering Process,Xinjiang Uygur Autonomous Region,School of Chemistry Engineering and Technology,Xinjiang University
- Key Laboratory of Thermal Science and Power Engineering of Ministry of Education,Tsinghua University
- Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi′anJiaotong University
- State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology
- School of Chemical Engineering and Technology,Xinjiang University
- College of Chemical Engineering,Sichuan University
Abstract:
Keywords:
- Zhundong coal
- Na
- combustion
- migration and conversion
Citation format:
马瑞(1992—),男,新疆维吾尔自治区巴州人,讲师,博士。E-mail:xju_marui@163.com
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Citation format:
MA Rui,WEI Bo,FAN Weidong,et al. Research progress of sodium migration and transformation during combustion ofZhundong coals in China[J].Clean Coal Technology,2023,29(10):27-53.
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