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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Bubbling fluidised bed gasification of wheat straw-gasifier performance using mullite as bed material
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Bubbling fluidised bed gasification of wheat straw-gasifier performance using mullite as bed material

机译：以莫来石为床料的小麦秸秆气化炉鼓泡流化床气化性能

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The adoption of wheat straw as a fuel for gasification processes has been hindered due to a lack of experience and its propensity to cause bed agglomeration in fluidised bed gasifiers. In this study wheat straw was gasified in a small scale, air blown bubbling fluidised bed using mullite as bed material. The gasifier was successfully operated and isothermal bed conditions maintained at temperatures up to 750 degrees C. Below this temperature, the gasifier was operated at equivalence ratios from 0.1 to 0.26. The maximum lower heating value of the producer gas was approximately 3.6 MJ m(-3) at standard temperature and pressure (STP) conditions and was obtained at an equivalence ratio of 0.165. In general, a producer gas with a lower heating value of approximately 3 MJ m(-3) at STP could be obtained across the entire range of equivalence ratios operated. The lower heating value tended to fluctuate, however, and it was considered more appropriate for use in heat applications than as a fuel for internal combustion engines. The concentration of combustibles in the producer gas was lower than that obtained from the gasification of wheat straw in a dual distributor type gasifier and a circulating fluidised bed. These differences were associated with reactor design and, in the case of the circulating fluidised bed, with higher temperatures. Equilibrium modelling at adiabatic conditions, which provides the maximum performance of the system, showed that the gasifier was operating at suboptimal equivalence ratios to achieve greatest efficiencies. The maximum calculated theoretical cold gas efficiency of 73% was obtained at an equivalence ratio of 0.35. (C) 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：由于缺乏经验及其在流化床气化炉中引起床团聚的倾向，阻碍了将麦草用作气化过程的燃料。在这项研究中，以莫来石为床料，将小麦秸秆气化成小规模的鼓风鼓泡流化床。气化炉已成功运行，等温床条件保持在最高750摄氏度的温度下。低于此温度，气化炉的当量比为0.1至0.26。在标准温度和压力（STP）条件下，生产气的最大较低热值约为3.6 MJ m（-3），并且在0.165的当量比下获得。通常，在整个运行的当量比范围内，可以获得在STP处具有较低热值约3 MJ m（-3）的生产气。然而，较低的热值趋于波动，并且被认为更适合用于热应用而不是用作内燃机的燃料。煤气中可燃气体的浓度低于在双分配器式气化炉和循环流化床中麦秆气化所获得的浓度。这些差异与反应器的设计有关，在循环流化床的情况下，温度较高。绝热条件下的平衡建模提供了系统的最佳性能，表明气化炉在次最佳当量比下运行以实现最高效率。当量比为0.35时，获得的最大理论冷气理论效率为73％。 （C）2015化学工程师学会。由Elsevier B.V.发布。保留所有权利。

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