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Numerical investigation on the impact of variable particle radiation properties on the heat transfer in high ash pulverized coal boiler through co-simulation

机译：联合模拟数值模拟研究不同颗粒辐射特性对高灰煤粉锅炉传热的影响

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Co-simulation of the high-temperature heat and mass transfer processes in coal-fired boilers using CFD together with process-level models of the water/steam circuit is a promising approach to investigate off-design conditions. In the present work, a 1D discretized two-phase model of the water flows in the evaporator and radiative superheaters was developed. This was coupled with a detailed furnace combustion and heat transfer CFD model. The coupled models are used to investigate the impact of variable particle emissivity and scattering efficiency on the evaporator and radiant superheater process conditions, including the furnace steam generation rate and final steam temperature. The results are compared with the case where the radiation properties of the particles are assumed to be constant, thereby highlighting the importance of accounting for the variations in the particle properties throughout the process. The case study boiler is that of a real 620 MWe subcritical power plant firing coal with a high ash content (41 %wt). The results show that the constant property model results in a predicted furnace heat load that is 6.5% lower than the experimental value, while the conversion-dependent model is only 0.7% lower than the experimental value.
机译：使用CFD与水/蒸汽回路的过程级模型一​​起对燃煤锅炉中高温传热和传质过程进行联合仿真是研究非设计条件的一种有前途的方法。在目前的工作中，建立了蒸发器和辐射过热器中水流的一维离散两相模型。再加上详细的熔炉燃烧和传热CFD模型。耦合模型用于研究可变的粒子发射率和散射效率对蒸发器和辐射式过热器工艺条件的影响，包括炉子蒸汽产生速率和最终蒸汽温度。将结果与假定粒子的辐射特性恒定的情况进行比较，从而强调了在整个过程中考虑粒子特性变化的重要性。案例研究的锅炉是一台真正的620 MWe亚临界发电厂的锅炉，它燃烧着高灰分（41％wt）的煤。结果表明，恒定特性模型的预测炉热负荷比实验值低6.5％，而转化率依赖性模型仅比实验值低0.7％。

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