Effect of O<sub>2</sub>/CO<sub>2</sub> combustion atmosphere on the mineral inter-reaction of blended coal ashes

ZHANG Zhong-jian; FANG Qing-yan; MA Lun; LIU Ji-chang; TAN Peng; ZHANG Cheng; CHEN Gang

Volume 46 Issue 6

Jun. 2018

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ZHANG Zhong-jian, FANG Qing-yan, MA Lun, LIU Ji-chang, TAN Peng, ZHANG Cheng, CHEN Gang. Effect of O2/CO2 combustion atmosphere on the mineral inter-reaction of blended coal ashes[J]. Journal of Fuel Chemistry and Technology, 2018, 46(6): 649-658.

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ZHANG Zhong-jian, FANG Qing-yan, MA Lun, LIU Ji-chang, TAN Peng, ZHANG Cheng, CHEN Gang. Effect of O₂/CO₂ combustion atmosphere on the mineral inter-reaction of blended coal ashes[J]. Journal of Fuel Chemistry and Technology, 2018, 46(6): 649-658.

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Effect of O₂/CO₂ combustion atmosphere on the mineral inter-reaction of blended coal ashes

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Funds:

National Natural Science Foundation of China 51676076

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Corresponding author: FANG Qing-yan, Tel: 027-87542417-8206，E-mail: qyfang@hust.edu.cn
Received Date: 2018-02-06
Rev Recd Date: 2018-05-02

Available Online: 2021-01-23

Publish Date: 2018-06-10

Abstract

Abstract

The mineral inter-reaction of blending coals during O₂/CO₂ combustion was studied. Two coals, Meng coal and Pingqi coal, were blended by certain ratios. The blending coals were burned in a tube furnace with O₂/CO₂ or O₂/N₂. Ash fusion temperature test, XRD, TG/DSC and thermodynamic calculation were employed to examine the melting behavior and mineral reactions of blending coal ashes during O₂/CO₂ and O₂/N₂ combustion in detail. The results show that:there is no a pronounced difference in the blending coal ash fusion temperature between O₂/CO₂ and O₂/N₂ combustion. More CaCO₃ produced during O₂/CO₂ combustion suggests that O₂/CO₂ atmosphere significantly prevents the decomposition of CaCO₃. The changing of atmosphere has an impact on the transformation of Ca-containing minerals, and the reaction between Ca and mullite occurs significantly, which is easier in O₂/CO₂ combustion to produce more low-melting phase that will aggravate the boiler slagging. When the blending ratio of Meng coal in blends with Pingqi coal is 75% or more, less mullite is present in blending coals, and thus the impact of atmosphere on Ca-mullite reaction is weaker. However, the atmosphere has a more impact on Fe-containing minerals and more Fe-glass phase will be formed during O₂/CO₂ combustion, which will aggravate the boiler slagging.
- pulverized coal,
- coal blending,
- O₂/CO₂ atmosphere,
- mineral transformation,
- boiler slagging

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References(26)

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