Advanced modelling and testing of a 13 MWth waste wood-fired grate boiler with recycled flue gas
Advanced modelling and testing of a 13 MWth waste wood-fired grate boiler with recycled flue gas
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DOI：
10.1016/j.enconman.2016.02.036
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发表时间：
2016-10
影响因子：
10.4
通讯作者：
B. Rajh;C. Yin;N. Samec;M. Hriberšek;M. Zadravec
中科院分区：
文献类型：
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作者：
B. Rajh;C. Yin;N. Samec;M. Hriberšek;M. Zadravec
数值模拟在工业中被广泛用于详细了解燃烧过程以及生物质/废物燃烧锅炉的适当设计和优化。本文介绍了一个13兆瓦的废木材燃烧炉排锅炉的数值研究，耦合床内燃料转换模型和稀相燃烧模型方法的基础上。建立了炉排燃料层中废木材转化的一维模型，为炉排干舷区的三维模拟提供了合适的炉排入口条件。由于部分烟气被回收到锅炉作为一个创新的尝试，以提高锅炉的性能，一个更精确的改进加权灰气体的总和模型，以更好地解决在锅炉中的辐射传热的CO2和H2O蒸汽浓度升高的影响。研究了全浮力对湍流流动的影响。在不同的端口在炉内的温度分布进行了测量，以揭示一些在锅炉中的流动和燃烧特性，也收集一些在火焰中的数据建模验证。本文提出的整体建模策略、新的子模型和烟气再循环的使用方法，对层燃锅炉的建模和设计具有一定的参考价值。
Numerical modelling is widely used in industry for detailed understanding of the combustion process and for appropriate design and optimization of biomass/waste-fired boilers. This paper presents a numerical study of a 13 MWthwaste wood-fired grate boiler, based on the coupled in-bed fuel conversion modelling and freeboard combustion modelling methodology. A 1D model is developed for the conversion of the waste wood in the fuel bed on the grate, providing the appropriate grate inlet condition for the 3D simulation of the freeboard region. Since part of the flue gas is recycled into the boiler as an innovative attempt to improve the boiler performance, a refined weighted-sum-of-grey-gases-model of greater accuracy is developed to better address the impacts of the elevated CO2and H2O vapour concentrations on radiative heat transfer in the boiler. The impacts of full buoyancy on the turbulent flow are also investigated. The temperature profiles at different ports in the furnace are measured to shed some light on the flow and combustion characteristics in the boiler and also to collect some in-flame data for modelling validation. The overall modelling strategy, the new sub-models and the use of recycled flue gas are all of great benefit or reference for modelling and design of grate-fired boilers.