State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, School of Chemical Engineering and Technology, Xinjiang University
Xinjiang Xinye Energy and Chemical Co. Ltd.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology
Zhundong Energy Research Institute, Xinjiang Tianchi Energy Co., Ltd.

本实验研究了常压和加压条件下氧化硅添加剂对准东煤灰中钠和硫转化特性的影响。结果表明，氧化硅添加剂在高压下对钠的释放具有更强的抑制作用。0.1 MPa下，添加比为4%时，灰中钠含量比无添加剂时高3.5%。而4 MPa、添加比例为0和4%时，灰中钠含量比0.1 MPa、无添加剂时分别高5.4%和6.9%。在0.1 MPa时，钠主要以NaAlSiO4 和 NaAlSi3O8的形式存在。随添加比的升高灰中NaAlSiO4的含量增加，这有效地减弱了灰的团聚。在4 MPa时，添加剂含量的增加，抑制了低熔点矿物CaSO4的分解，并且显著促进了NaAlSiO4与CaSO4反应生成Na6Ca2Al6Si6O24(SO4)2的反应。本实验提出了高压下氧化硅抑制煤灰中钠和硫释放的机理。

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.

肖伍扬, 魏博, 王建江, 马金荣, 买尔哈巴·阿不都热合曼, 李显, 姚洪, 程泽宁. 氧化硅添加剂对常压和加压条件下准东煤灰中钠和硫转化特性的影响[J]. 燃料化学学报（中英文）, 2023, 51(9): 1220-1231.

XIAO Wu-yang, WEI Bo, WANG Jian-jiang, MA Jin-rong, ABUDOUREHEMAN Maierhaba, LI Xian, YAO Hong, CHENG Ze-ning. Effect of silicon oxide additive on the transformation characteristics of sodium and sulfur in Zhundong coal ash under atmospheric and elevated pressure[J]. Journal of Fuel Chemistry and Technology, 2023, 51(9): 1220-1231.