Effect of silicon oxide additive on the transformation characteristics of sodium and sulfur in Zhundong coal ash under atmospheric and elevated pressure

Q3 Energy 燃料化学学报 Pub Date : 2023-09-01 DOI:10.1016/S1872-5813(23)60353-6

Wu-yang XIAO , Bo WEI , Jian-jiang WANG , Jin-rong MA , Maierhaba ABUDOUREHEMAN , Xian LI , Hong YAO , Ze-ning CHENG

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Abstract

The effects of silicon oxide additive on the transformation characteristics of sodium and sulfur in coal ash under atmospheric and elevated pressure were investigated in this study. The results indicated that silicon oxide additive significantly inhibited the release of sodium under high pressure. The sodium content in ash with 4% of silicon oxide additive was 3.5% at 0.1 MPa, which was higher than that without additive. However, the sodium content increased to 5.4% without additive and 6.9% with 4% additive at 4 MPa, respectively. The sodium mainly existed in the forms of NaAlSiO₄ and NaAlSi₃O₈ at 0.1 MPa, and the content of NaAlSiO₄ increased with increasing additive dosage, which weakened the agglomeration of ash. The decomposition of low melting point mineral CaSO₄ was inhibited at 4 MPa, and the formation of Na₆Ca₂Al₆Si₆O₂₄(SO₄)₂ from NaAlSiO₄ and CaSO₄ was promoted significantly with increasing additive dosage. Furthermore, the inhibition mechanism of sodium and sulfur released from coal ash by silicon oxide under high pressure was proposed.

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氧化硅添加剂对准东煤灰中钠和硫在常压和高压下转化特性的影响

研究了氧化硅添加剂对粉煤灰中钠和硫在常压和高压下转化特性的影响。结果表明，氧化硅添加剂能明显抑制高压下钠的释放。在0.1 MPa下，添加4%氧化硅的灰分钠含量为3.5%，高于未添加氧化硅的灰分钠含量。在4 MPa条件下，钠含量分别为5.4%和6.9%。在0.1 MPa下，钠主要以NaAlSiO4和NaAlSi3O8的形式存在，随着添加量的增加，NaAlSiO4的含量增加，减弱了灰分的团聚。在4 MPa时，低熔点矿物CaSO4的分解受到抑制，随着添加量的增加，NaAlSiO4和CaSO4生成Na6Ca2Al6Si6O24(SO4)2的速度显著加快。进一步探讨了高压氧化硅抑制煤灰中钠和硫释放的机理。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.