该文研究生物质与煤复合串行气化工艺,利用计算颗粒流体动力学（CPFD）方法建模,全面考虑床内的流动特性,颗粒动力学、热质传递过程以及均相和异相化学反应。研究各种操作变量对气体组成、气体产量以及气化效率的影响。结果表明：气化过程中提高气化温度是有利的,同时,必须考虑炉内湍流的影响。不同水蒸气与生物质质量比（SBR）下的气化反应机制有所不同,在低SBR下,密相区的气固反应被促进;而在高SBR下,稀相区出口的均相反应被增强。应采用较高的生物质与煤质量比（BCR）。不同生物质原料的气化性能差异不大,该文工艺中,生物质原材料具有可替代性。
Abstract
This study investigates the biomass and coal composite serial gasification process using the Computational Particle Fluid Dynamics （CPFD） method to develop a comprehensive model. The model accounts for flow behavior, particle dynamics, heat and mass transfer, as well as both homogeneous and heterogeneous chemical reactions within the gasifier. A parametric analysis is conducted to evaluate the effects of gasification temperature, steam-to-biomass ratio （SBR）, biomass-to-coal ratio （BCR）, and biomass particle size on the syngas composition, gas yield, and overall gasification efficiency. Results indicate that higher gasification temperatures enhance gasification performance, although furnace turbulence effects must be considered. Different SBR lead to distinct reaction mechanisms： low SBR favors gas-solid reactions in the dense phase, whereas high SBR enhances homogeneous reactions near the outlet. A higher BCR is recommended to improve efficiency. Furthermore, performance varies little across different biomass raw materials, indicating that the proposed process allows for flexible raw materials substitution.
关键词
生物质 /
煤 /
串行 /
气化 /
CPFD /
模拟
Key words
biomass /
coal /
serial /
gasification /
CPFD /
simulation
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基金
湖州市特种设备检测研究院科研项目（2023-ZB-05）; 湖南省自然科学基金（2023JJ50342）; 湖南省教育厅科研项目（23A0567; 24B0726）
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