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首页> 外文期刊>Applied Energy >The impacts of different profiles of the grate inlet conditions on freeboard CFD in a waste wood-fired grate boiler
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The impacts of different profiles of the grate inlet conditions on freeboard CFD in a waste wood-fired grate boiler

机译：不同曲线在废木材燃烧炉锅炉中的炉排入口条件下不同谱的影响

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摘要

The common combustion disturbances in the fuel bed in a grate-fired boiler pose a great challenge to accurate modelling of the fuel bed conversion. Therefore, it is difficult to describe the lengthwise profiles of the combustibles leaving the fuel bed into the freeboard accurately. This paper investigates how different fuel bed models or grate inlet profiles will affect the Computational Fluid Dynamics simulation of combustion in the freeboard in industrial grate boilers. Two grate inlet conditions, which are very different in the profiles along the grate but yield the same total mass, momentum, species and energy fluxes into the freeboard, are used in the freeboard simulation of a 13 MWth grate boiler, respectively. The key findings from the comparison between the simulation results and measurement data are as follows. Firstly, the fuel bed model or grate inlet condition accounting for the realistic lengthwise biomass conversion pattern can be used reliably for the simulation of a grate boiler and simulation-based boiler optimisation. Secondly, the impacts of different fuel bed models or different profiles of the grate inlet conditions are virtually restricted only to the vicinity of the fuel bed or in the primary combustion chamber. After the secondary combustion chamber in which up-flowing gas is mixed well with the secondary and tertiary air jets, the simulation results are close to each other. For more general and reliable applications, a comprehensive bed model resolving the mixing, reactions, heat and mass transfer in the fuel bed, is needed and under development.
机译：燃烧锅炉中燃料床中的常见燃烧干扰构成了精确建模燃料床转换的巨大挑战。因此，难以准确地描述使燃料床的可燃物的纵向轮廓入到干舷。本文研究了不同的燃料床模型或炉排型材如何影响工业格栅锅炉中干舷中燃烧的计算流体动力学模拟。两个炉排入口条件在沿着炉排的曲线中非常不同，但在干舷中产生相同的总质量，动量，物种和能量通量，分别用于13个MW炉锅炉的收集器模拟。仿真结果和测量数据之间的比较的关键发现如下。首先，燃料床模型或炉排入口条件占现实纵向生物质转换图案的算法，可以可靠地用于仿真炉排锅炉和基于仿真的锅炉优化。其次，不同燃料床模型或不同燃料入口条件的不同型材的影响几乎仅限于燃料床或初级燃烧室的附近。在用次级和三次空气喷射的次流气体混合的二次燃烧室之后，模拟结果彼此靠近。对于更一般和可靠的应用，需要一个综合床模型，解决燃料床中的混合，反应，热量和传质和开发。

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