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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Reactor modelling assessment for urea-SNCR applications
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Reactor modelling assessment for urea-SNCR applications

机译：尿素-SNCR应用的反应堆建模评估

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Purpose - This work aims to investigate the effects of neglecting, modelling or partly resolving turbulent fluctuations of velocity, temperature and concentrations on the predicted turbulence-chemistry interaction in urea-selective non-catalytic reduction (SNCR) systems. Design/methodology/approach - Numerical predictions of the NO conversion efficiency in an industrial urea-SNCR system are compared to experimental data. Reactor models of varying complexity are assessed, ranging from one-dimensional ideal reactor models to state-of-the-art computational fluid dynamics simulations based on the detached-eddy simulation (DES) approach. The models use the same reaction mechanism but differ in the degree to which they resolve the turbulent fluctuations of the gas phase. A methodology for handling of unknown experimental data with regard to providing adequate boundary conditions is also proposed. Findings - One-dimensional reactor models may be useful for a first quick assessment of urea-SNCR system performance. It is critical to account for heat losses, if present, due to the significant sensitivity of the overall process to temperature. The most comprehensive DES setup evaluated is associated with approximately two orders of magnitude higher computational cost than the conventional Reynolds-averaged Navier-Stokes-based simulations. For studies that require a large number of simulations (e.g. optimizations or handling of incomplete experimental data), the less costly approaches may be favored with a tolerable loss of accuracy. Originality/value - Novel numerical and experimental results are presented to elucidate the role of turbulent fluctuations on the performance of a complex, turbulent, reacting multiphase flow.
机译：目的-这项工作旨在研究忽略，建模或部分解决速度，温度和浓度的湍流波动对尿素选择性非催化还原（SNCR）系统中预测的湍流-化学相互作用的影响。设计/方法/方法-将工业尿素SNCR系统中NO转化效率的数值预测与实验数据进行比较。评估了各种复杂程度的反应堆模型，从一维理想反应堆模型到基于分离涡流仿真（DES）方法的最新计算流体动力学模拟，不等。这些模型使用相同的反应机理，但是解决气相湍流波动的程度不同。还提出了一种处理未知实验数据以提供适当边界条件的方法。研究结果-一维反应器模型可能对尿素-SNCR系统性能的首次快速评估有用。由于整个过程对温度的显着敏感性，考虑到热量损失（如果存在）是至关重要的。与传统的基于雷诺平均的基于Navier-Stokes的仿真相比，所评估的最全面的DES设置的计算成本高出大约两个数量级。对于需要大量模拟的研究（例如优化或处理不完整的实验数据），可能会倾向于使用成本较低的方法，并且可以容忍准确性下降。原创性/价值-提出了新的数值和实验结果，以阐明湍流波动对复杂，湍流，反应性多相流性能的影响。

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