Citation: CUI Xiang-zheng, WEI Shu-zhou, ZHANG Jun-feng, ZHAO Yong-chun, ZHANG Jun-ying, ZHENG Chu-guang. State and leaching characteristics of Cr and As in the solid phase products of ultra-low emission coal-fired units[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(12): 1506-1512. shu

State and leaching characteristics of Cr and As in the solid phase products of ultra-low emission coal-fired units

1.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Sanhe Power Generation Co., Ltd., Sanhe 065201, China

Corresponding author: ZHAO Yong-chun, yczhao@hust.edu.cn
Received Date: 18 September 2020
Revised Date: 23 October 2020

Fund Project: the National R & D Program Project of China 2018YFB0605104the Key Research and Development Program of Hubei Province 2020BCA076the National Natural Science Fundation of China 42030807The project was supported by the National R & D Program Project of China(2018YFB0605104), the National Natural Science Fundation of China (42030807) and the Key Research and Development Program of Hubei Province(2020BCA076)

Figures(13)

The content and state and leaching characteristics of the two trace elements, viz., chromium (Cr) and arsenic (As), in the solid product of ultra-low emission units in the coal-fired power plants are investigated. The results show that the contents of chromium and arsenic in the fly ash are in general higher than those in the bottom slag. In the fly ash samples of units 1#, 2#, and 3#, the most abundant chromium and arsenic species appear in the exchangeable state and oxidizable state, respectively, whereas in the ash sample of unit 4#, the residues account for the most chromium and arsenic species. The leaching concentration of arsenic is lower than 0.01 mg/L as specified in the groundwater environmental standard (GB 14848—2017); however, the leaching concentration of chromium in the fly ash of 2# and 3# units is higher than the emission limit, to which close attention should be paid.
- ultra-low emission,
- chromium,
- arsenic,
- content,
- speciation,
- leaching characteristics
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