固定床气化炉动力学模拟及不同生物质原料制合成气性能研究

Bedewi Bilal, S. Fanta, N. Satheesh
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引用次数: 1

摘要

生物质是最清洁的可再生能源之一。近年来,由于生物质对一氧化碳等温室气体的零排放,研究人员对其给予了更多的关注。在生物质利用技术中,生物质气化是利用不同农业工业产生的废弃生物质的一种有吸引力的机制。尽管固定床流气化已大规模应用,但热转化区的反应速率几乎是未知的。然而,关于在高温高压下的气化反应速率的知识对于这些气化炉的详细设计和优化至关重要。研究重点是基于气化炉动力学的生物质(咖啡豆和大米)壳气化过程的模拟,以研究产生的合成气组成。利用asppenplus模拟软件研究了不同操作参数对采出气成分的影响。不同比例的模拟参数包括气化温度、压力、反应器体积、当量比和湿度对产气量和组成的影响。敏感性分析结果表明,温度升高导致h2和CO气体的产生增加。而随着生物质含水量的增加,产气的热值降低。根据所得结果,在气化温度为800℃、蒸汽与生物质比为0.1、气化压力为1 bar、含水率为0.05%、反应器体积为0.02 m3时,合成气的最大热值较低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinetic based simulation of fixed bed gasifier and performance study on syngas production from different biomass feed-stocks
Biomass is one of the most clean and renewable energy resources. In recent times, researchers have given more attention to biomass due to its zero emission of greenhouse gases such as carbon monoxide. In biomass utilization technologies, biomass gasification is an attractive mechanism for utilization of waste biomass generated from different agro-industries. Despite the application of fixed bed flow gasification on a large scale, the reaction rate in the hot conversion zone is almost unknown. However, knowledge regarding the rates of the gasification reaction at high temperature and high pressure is crucial for detailed design and optimization of these gasifiers. The study focused on the simulation of biomass (coffee bean and rice) husk gasification process based on the kinetics of the gasifier in order to investigate the produced syngas composition. The AspenPlus simulation was used to investigate the effect of operating parameters on the composition of the produced gas. Effect of different proportions of the simulation parameter includes gasification temperature, pressure, reactor volume, equivalence ratio and moisture on gas production and composition. Results of sensitivity analysis showed that an increase in temperature led to a rise in the production of H 2 and CO gases. Whereas, an increase in moisture content of the biomass showed lower heating value of the produced gas. Based on the obtained result, the maximum lower heating value of syngas was obtained at the gasification temperature of 800 o C, steam to biomass ratio of 0.1, pressure of 1 bar, 0.05% of moisture content and 0.02 m 3 of reactor volume.
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