Abstract Uniformity of coal and air has always been an important problem in the operation of large-scale CFB boilers. The selection of inlet boundary conditions is close related to the simulation accuracy, but seldom considered in the previous literatures. In this paper, a new method to estimate the distributions of coal supply was proposed, which was used as the boundary condition together with the experimental data to carry out combustion simulations on a 600 MW supercritical CFB boiler by using the Computational Particle Fluid Dynamics (CPFD) method. The simulation results were validated against the critical measured data including solid concentration, gas/solid circulation flow rate, gas temperature, oxygen concentration, etc., indicating that the model using the proposed boundary conditions could predict the combustion characteristics more accurately than that with common uniform boundary conditions. Based on the simulation results, the influence of air/coal distribution on the combustion in the furnace under different loads was investigated, a series of non-uniform problems were also found and analyzed. The research method and results of this paper can provide meaningful reference for the combustion simulation and operation optimization of large-scale CFB boilers.

中文翻译：

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CPFD模型在改进入口边界条件下超临界CFB锅炉气固流动与燃烧模拟中的验证与应用

摘要 煤与空气的均匀性一直是大型循环流化床锅炉运行中的重要问题。入口边界条件的选择与模拟精度密切相关，但在以往文献中很少考虑。本文提出了一种估算供煤分布的新方法，将其作为边界条件，结合实验数据，利用计算粒子流体动力学(CPFD)对600 MW超临界CFB锅炉进行燃烧模拟。 ） 方法。模拟结果与关键测量数据进行了验证，包括固体浓度、气/固循环流量、气体温度、氧气浓度等，表明使用所提出的边界条件的模型可以比使用普通均匀边界条件的模型更准确地预测燃烧特性。基于模拟结果，研究了不同负荷下空气/煤分布对炉内燃烧的影响，发现并分析了一系列不均匀问题。本文的研究方法和结果可为大型循环流化床锅炉的燃烧模拟和运行优化提供有意义的参考。