李晓, 董睿, 朱超超, 张如梦, 黄婷婷, 刘开蓉, 张兴闯, 李佩. 复配生物质灰催化煤焦气化反应性及其赋存形态迁移规律[J]. 燃料化学学报(中英文). DOI: 10.1016/S1872-5813(24)60483-4
引用本文: 李晓, 董睿, 朱超超, 张如梦, 黄婷婷, 刘开蓉, 张兴闯, 李佩. 复配生物质灰催化煤焦气化反应性及其赋存形态迁移规律[J]. 燃料化学学报(中英文). DOI: 10.1016/S1872-5813(24)60483-4
LI Xiao, DONG Rui, ZHU Chaochao, ZHANG Rumeng, HUANG Tingting, LIU Kairong, ZHANG Xingchuang, LI Pei. Catalytic effects of simulated biomass ashes on coal gasification characteristics and the transformation evolution during gasification process[J]. Journal of Fuel Chemistry and Technology. DOI: 10.1016/S1872-5813(24)60483-4
Citation: LI Xiao, DONG Rui, ZHU Chaochao, ZHANG Rumeng, HUANG Tingting, LIU Kairong, ZHANG Xingchuang, LI Pei. Catalytic effects of simulated biomass ashes on coal gasification characteristics and the transformation evolution during gasification process[J]. Journal of Fuel Chemistry and Technology. DOI: 10.1016/S1872-5813(24)60483-4

复配生物质灰催化煤焦气化反应性及其赋存形态迁移规律

Catalytic effects of simulated biomass ashes on coal gasification characteristics and the transformation evolution during gasification process

  • 摘要: 本工作通过复配生物质灰的实验方法,重点考察典型生物质灰中关键组分对煤焦气化反应性的影响,分析了气化过程生物质灰的赋存形态迁移规律及煤焦结构演化特征。研究结果表明,气化温度及Si元素含量是影响煤焦气化反应性的关键因素,当煤中Si/K质量比为0.5及1.0时,复配煤样气化反应性强于原煤,而Si/K质量比为1.5时,气化反应性则比原煤差。实验条件下Si/K质量比为0.5、Ca/K质量比为0.4的样品气化反应性最强,反应性指数约为原煤的1.35倍。相比含钾矿物质,含钙矿物质有着更高的反应活性,容易与硅酸盐结合生成含钙硅酸盐,如钙沸石(CaO·Al2O3·2SiO2·4H2O)等,进而避免了含钾矿物质与硅酸盐的反应,使钾能够充分地发挥其催化作用。动力学分析显示,复配生物质灰催化脱灰煤的气化过程采用收缩核模型拟合较为适宜,当Si/K质量比为0.5、Ca/K质量比为0.4时,复配煤样的气化反应活化能缩减为174.39 kJ/mol,相比原煤降低了14.32%。

     

    Abstract: This paper focuses on the influence of key components in biomass ash on the gasification reactivity of coal by using simulated biomass ash. The migration patterns of typical biomass ash components and the structural evolution characteristics of coal during gasification process were deeply investigated. The results indicate that gasification temperature and Si element content are the key factors affecting gasification reactivity of coal. When the Si/K mass ratio is 0.5 and 1.0, gasification reactivity of the composite coal sample is stronger than that of raw coal, while the Si/K mass ratio is 1.5, gasification reactivity is weaker than that of raw coal. Under the experimental conditions, the composite coal sample with a Si/K mass ratio of 0.5 and a Ca/K mass ratio of 0.4 shows the strongest reactivity. The gasification reactivity index is 1.35 times higher than that of raw coal. Compared to potassium-containing minerals, calcium-containing minerals have stronger reactivity and are more likely to react with silicates to form calcium-containing silicates, such as calcium zeolites (CaO·Al2O3·2SiO2·4H2O), thereby avoiding the reaction between potassium-containing minerals and silicates to form non-catalytic minerals, which allows potassium to fully exert its catalytic effects. Dynamic analysis implies that shrinking core model well describes the gasification process of deashing coal catalyzed by simulated biomass ash. When the Si/K mass ratio is 0.5 and the Ca/K mass ratio is 0.4, the activation energy of composite coal sample is reduced to 174.39 kJ/mol, which is 14.32% lower than that of raw coal.

     

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