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焦炭燃烧是煤燃烧的重要过程,准确模拟焦炭燃烧,深入研究焦炭燃烧的物理规律,对于预测及优化煤燃烧过程有很大意义。间断有限元方法具有良好几何适应性和稳定性,是准确模拟气固两相流动问题的较好方法。然而该方法尚未应用于求解气固两相燃烧,且存在通量重构格式无法应用于动网格计算的问题。本文利用间断有限元方法进行空间离散,结合任意拉格朗日-欧拉方法处理动网格问题,进行了二维流场下焦炭颗粒燃烧过程的直接模拟,并将该方法应用于多个焦炭颗粒运动燃烧的计算,得到了较准确的结果,揭示了单颗粒及运动多颗粒焦炭燃烧过程中流场的变化规律。
Coke combustion is an important process of coal combustion. Accurately simulating the combustion of coke, and further studying the physical laws of coke combustion are of great significance for predicting and optimizing coal combustion process. The discontinuous finite element method has good geometric adaptability and stability and is a good method to accurately simulate the gas-solid two-phase flow problem. However, this method has not been applied to solve the gas-solid two-phase combustion, and the problem that the flux reconstruction format can not be applied to the moving grid calculation has been presented. In this paper, the discontinuous finite element method is used for the spatial discretization, and the Lagrange-Euler method is used to deal with the moving grid problem. The direct simulation of the coke particle combustion process in the two-dimensional flow field is carried out and the method is applied to multiple coke The calculation of the kinetic burning of the particles obtained the more accurate results and revealed the variation of the flow field during the combustion of the single particles and the multi-particulates coke.