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Hydrogen production from biomass gasification; a theoretical comparison of using different gasification agents

机译：生物质气化制氢；使用不同气化剂的理论比较

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摘要

In the present paper hydrogen production from biomass gasification using various agents is investigated and compared theoretically, from the viewpoints of the first and second thermodynamics laws. Gasification of wood and paper, as two types of common biomass feedstocks, is assessed using four gasification agents namely: air, oxygen-enriched air, oxygen and steam. Thermodynamic equilibrium model is employed to simulate the gasification process, the results of which are validated using available theoretical and experimental data in literature. The NOx and SOx emissions from the biomass gasification are also considered in the model and a sensitivity analysis is performed to determine the accuracy of the results regarding to the uncertainties of the input data. A parametric study is conducted to assess the effects of key operating parameters on the hydrogen concentration and calorific value of producer gas, energy and exergy efficiencies of the process and exergy destruction rate at different operating conditions. The results indicate that the higher values of hydrogen production is associated respectively with using steam, oxygen, oxygen-enriched air and air as the gasification agents. Also, it is concluded that for the gasification process the highest value of sensible energy efficiency is obtained for air gasification, while the highest exergy efficiency, as a rational criterion, is obtained for steam gasification for which the calorific value of the producer gas can reach to higher than 11 MJ/Nm(3).
机译：在本文中，从第一热力学定律和第二热力学定律的角度，对使用各种试剂的生物质气化制氢进行了研究，并在理论上进行了比较。木材和纸张的气化是两种常见的生物质原料，使用四种气化剂进行评估：空气，富氧空气，氧气和蒸汽。采用热力学平衡模型来模拟气化过程，并利用现有的理论和实验数据对结果进行验证。模型中还考虑了来自生物质气化的NOx和SOx排放，并进行了敏感性分析以确定有关输入数据不确定性的结果准确性。进行了参数研究，以评估关键操作参数对氢气浓度和生产气的热值，工艺的能量和火用效率以及在不同操作条件下的火用破坏率的影响。结果表明，较高的产氢量分别与使用蒸汽，氧气，富氧空气和空气作为气化剂有关。此外，得出的结论是，对于气化过程，对于空气气化而言，获得了最高的能效效率值，而对于合理的标准，对于蒸汽气化而言，则获得了最高的火用效率，其产生气的热值可以达到高于11 MJ / Nm（3）。

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