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Systematic review of research guidelines for numerical simulation of biomass gasification for bioenergy production

机译：系统审查生物质气化用于生物能源生产的数值模拟研究指南

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摘要

Sustainable energy production through conversion of biomass has recently found growing interest. Among thermochemical conversion techniques, gasification is of interest to replace direct combustion emitting air pollutants that threaten our environment. However, gasification process is still far from being efficient since most of the research studies have only focused on experimental implementation of the methods while numerical modeling has been limited to pilot scales, ignoring the performance optimization required for scaling up the gasification process. Gasification is a highly complex process, which involves the coupling of thermochemical equilibrium, kinetics, heat and mass transfer, and computational fluid dynamics. This complexity has currently prevented the proposed theoretical/computational models in the literature from achieving the required accuracy for optimizing the gasification process. Herein, we offer a comprehensive guideline to improve the numerical models which can be implemented in future sustainable biorefineries to improve their efficiency. The present study pursues two principal objectives: (1) Introducing the fundamental knowledge required for theoretical/computational modeling and (2) Reviewing alternative numerical models for gasification process. First, a brief overview of the knowledge needed to make a systematic model is gathered. The theory of gasification, the various types of gasifiers and their differences are reviewed. Furthermore, we discuss the importance of the type of biomass feedstock with concentration on advanced biofuels and focus on wood pellets for the modeling section. Second, CFD is introduced and chemical equilibrium, kinetics, and heat and mass transfer models are discussed in depth and the variation of different parameters with respect to the change of temperature within a gasifier is elaborated. The results of this study make a clear pathway for modeling of gasification process by anticipating the expected outputs from the model by using the existing experimental data. Finally, comprehensive application of these models is demonstrated and substantial parameters affecting the gasification process are introduced. This paper provides a framework for numerical modeling of the gasification process of biomass to optimize the efficiency of the conversion process.
机译：通过生物质转化实现可持续能源生产近来受到越来越多的关注。在热化学转化技术中，关注气化以替代威胁到我们环境的直接燃烧排放的空气污染物。但是，气化过程仍然远远不够高效，因为大多数研究仅集中在方法的实验实现上，而数值建模仅限于中试规模，而忽略了扩大气化过程所需的性能优化。气化是一个高度复杂的过程，涉及热化学平衡，动力学，传热和传质以及计算流体动力学的耦合。这种复杂性目前阻止了文献中提出的理论/计算模型达到优化气化过程所需的精度。在此，我们提供了完善的指南来改进数值模型，可以在未来的可持续生物炼油厂中实施该模型以提高其效率。本研究追求两个主要目标：（1）介绍理论/计算模型所需的基本知识；（2）审查气化过程的替代数值模型。首先，收集了建立系统模型所需知识的简要概述。综述了气化的原理，各种类型的气化炉及其区别。此外，我们将重点讨论先进生物燃料中生物质原料类型的重要性，并在建模部分中重点介绍木质颗粒。其次，介绍了CFD，并深入讨论了化学平衡，动力学，传热和传质模型，并阐述了气化炉内不同参数相对于温度变化的变化。这项研究的结果通过使用现有的实验数据预测模型的预期输出，为气化过程建模提供了一条清晰的途径。最后，证明了这些模型的综合应用，并介绍了影响气化过程的重要参数。本文为生物质气化过程的数值模拟提供了一个框架，以优化转化过程的效率。

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