Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO2 and H2O

能源化学(英文) ›› 2015, Vol. 21 ›› Issue (4): 381-387.

Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO₂ and H₂O

Liying Wang, Haixin Mao, Zengshuang Wang, Jian-Ying Lin, Meijun Wang, Liping Chang

College of Chemistry and Chemical Engineering, Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

收稿日期:2015-04-07 修回日期:2015-05-27 发布日期:2015-08-21
通讯作者: Jian-Ying Lin
基金资助:
The authors gratefully acknowledge the financial support for this research from the Natural Science Foundation of China (U1261110), the Natural Science Foundation of Shanxi Province (2013011042-2), and the Foundation of State Key Laboratory of Coal Combustion (FSKLCC-0914).

Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO₂ and H₂O

Liying Wang, Haixin Mao, Zengshuang Wang, Jian-Ying Lin, Meijun Wang, Liping Chang

College of Chemistry and Chemical Engineering, Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

Received:2015-04-07 Revised:2015-05-27 Published:2015-08-21
Contact: Jian-Ying Lin
Supported by:
The authors gratefully acknowledge the financial support for this research from the Natural Science Foundation of China (U1261110), the Natural Science Foundation of Shanxi Province (2013011042-2), and the Foundation of State Key Laboratory of Coal Combustion (FSKLCC-0914).

摘要/Abstract

摘要： The occurrence modes of alkali and alkaline-earthmetals (AAEMs) in coal relate to their release behavior and ash formation during combustion. To better understand the transformation of AAEMs, the release behavior of water-soluble, HCl-soluble, HCl-insoluble AAEMs during Shenmu coal (SM coal) oxy-fuel combustion in the presence of SO₂ and H₂O in a drop-tube reactor was investigated through serial dissolution using H₂O and HCl solutions. The results show that the release rates of AAEMs increase with an increase in temperature under the three atmospheres studied. The high release rates of Mg and Ca from SM coal are dependent on the high content of soluble Mg and Ca in SM coal. SO₂ inhibits the release rates of AAEMs, while H₂O promotes them. The effects of SO₂ and H₂O on the Na and K species are more evident than those on Mg and Ca species. All three types of AAEMs in coal can volatilize in the gas phase during coal combustion. The W-type AAEMs release excessively, whereas the release rates of I-type AAEMs are relatively lower. Different types of AAEMmay interconvert through different pathways under certain conditions. Both SO₂ and H₂O promote the transformation reactions. The effect of SO₂ was related to sulfate formation and the promotion by H₂O occurs because of a decrease in the melting point of the solid as well as the reaction of H₂O.

关键词: Coal, O_xy-fuel combustion, Alkali metal, Alkaline-earth metal, Occurrence mode, Transformation

Abstract: The occurrence modes of alkali and alkaline-earthmetals (AAEMs) in coal relate to their release behavior and ash formation during combustion. To better understand the transformation of AAEMs, the release behavior of water-soluble, HCl-soluble, HCl-insoluble AAEMs during Shenmu coal (SM coal) oxy-fuel combustion in the presence of SO₂ and H₂O in a drop-tube reactor was investigated through serial dissolution using H₂O and HCl solutions. The results show that the release rates of AAEMs increase with an increase in temperature under the three atmospheres studied. The high release rates of Mg and Ca from SM coal are dependent on the high content of soluble Mg and Ca in SM coal. SO₂ inhibits the release rates of AAEMs, while H₂O promotes them. The effects of SO₂ and H₂O on the Na and K species are more evident than those on Mg and Ca species. All three types of AAEMs in coal can volatilize in the gas phase during coal combustion. The W-type AAEMs release excessively, whereas the release rates of I-type AAEMs are relatively lower. Different types of AAEMmay interconvert through different pathways under certain conditions. Both SO₂ and H₂O promote the transformation reactions. The effect of SO₂ was related to sulfate formation and the promotion by H₂O occurs because of a decrease in the melting point of the solid as well as the reaction of H₂O.

Key words: Coal, O_xy-fuel combustion, Alkali metal, Alkaline-earth metal, Occurrence mode, Transformation

Liying Wang, Haixin Mao, Zengshuang Wang, Jian-Ying Lin, Meijun Wang, Liping Chang. Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO₂ and H₂O[J]. 能源化学(英文), 2015, 21(4): 381-387.

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Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO₂ and H₂O

Transformation of alkali and alkaline-earth metals during coal oxy-fuel combustion in the presence of SO₂ and H₂O

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