Citation: HAN Jun, LIANG Yang-shuo, ZHAO Bo, XIONG Zi-jiang, QIN Lin-bo, CHEN Wang-sheng. In-situ reaction between arsenic/selenium and minerals in fly ash at high temperature during blended coal combustion[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(11): 1356-1364. shu

In-situ reaction between arsenic/selenium and minerals in fly ash at high temperature during blended coal combustion

1.
Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China
2.
Industrial Safety Engineering Technology Research Center of Hubei Province, Wuhan University of Science and Technology, Wuhan 430081, China

Corresponding author: ZHAO Bo, zhaobo87@wust.edu.cn
Received Date: 17 August 2020
Revised Date: 8 September 2020

Fund Project: The National Key Research and Development Program of China 2018YFB0605102The project was supported by The National Key Research and Development Program of China (2018YFB0605102)

Figures(5)

Blended coal combustion technology was extensively used in coal-fired power plants in China. In order to investigate the in-situ reaction between trace elements and minerals in fly ash during blended coal combustion, a bituminous (HLH), anthracite (ZW) and the blended coal of these two parent coals were combusted in a drop tube furnace at 1150 ℃. The ash gathered at high temperature segment (HTA) and low temperature segment (LTA) of the furnace were analyzed, respectively. The results indicated that the retention rates of arsenic in HTA were lower than that in LTA, which suggested that arsenic would be re-absorbed by ash during cooling down of flue gas. For HTA the retention rates of arsenic in ash of ZW, Z3H1, Z1H1, Z1H3, HLH were 60.31%, 26.85%, 13.29%, 20.23% and 36.11%, respectively. The arsenic was more difficult to be captured by HTA of blended coal than that of parent coal. As for selenium, the retention rates in HTA of five coal samples were 24.68%, 23.60%, 20.58%, 15.19% and 38.13%, which had the same retention law as arsenic. The results of X-ray diffraction (XRD) demonstrated that the mineral morphology was changed obviously during blended coal combustion. Unlike parent coal, mullite appeared in HTA of blended coal, and peak of mullite was enhanced with proportion of ZW increased in blended coal. It was consistent with the trend of retention of As and Se in HTA. It illustrated that change of mineral species and in-situ reaction between minerals and trace elements significantly affected emission of arsenic and selenium during blended coal combustion.
- blended coal,
- arsenic,
- selenium,
- mineral,
- in-situ reaction
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