基于CFD与POD的煤粉锅炉三维速度场快速预测  

Rapid prediction of three-dimensional velocity field of pulverized coal boiler based on CFD and POD

作　　者：李天宇 陈曦[1] 钟文琪[1] Li Tianyu;Chen Xi;Zhong Wenqi(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2022年第4期641-649,共9页Journal of Southeast University：Natural Science Edition

摘　　要：为满足锅炉优化气固流场以防止受热面磨损对炉内三维速度场数据实时获取的需求,建立了一种基于计算流体力学(CFD)和本征正交分解(POD)的煤粉锅炉三维速度场快速预测模型.通过建立数值模型对一台330 MW四角切圆煤粉锅炉大量变工况条件下的三维速度场数据进行了模拟计算并建立数据集,采用POD方法对数据集进行了模态与模态系数提取,通过机器学习方法构建了工况参数与模态系数间的映射关系,实现了任意工况参数下锅炉速度场的快速预测.结果表明,所提模型可以通过少量模态重构出锅炉速度场的主要特征.模型泛化性和计算结果准确率较高,计算结果平均相对误差为1.80%,均方根误差小于0.35 m/s.模型计算速度快,获取锅炉速度场的平均计算时间由CFD模拟所需的约2819 min减小至约3 min.To meet the needs of real-time acquisition of three-dimensional velocity field data from the interior of the furnace for optimizing the gas-solid flow field of the boiler to prevent the wear of the heating surface,a rapid prediction model of three-dimensional velocity field of pulverized coal boiler based on computational fluid dynamics(CFD)and proper orthogonal decomposition(POD)was established.The three-dimensional velocity field data of a 330 MW tangential firing pulverized coal boiler under a large number of variable operating conditions were simulated and the data set was established by a numerical model.The modal and the modal coefficients were extracted by the POD method.The mapping relationship between the operating parameters and the modal coefficients was constructed by a machine learning method,and the fast prediction of the boiler velocity field on arbitrary operating parameters was realized.The results show that the model can reconstruct the main features of the boiler velocity field by a minor number of modals.The generalization rate of model and the accuracy of the computational results are high,the average relative error of the model calculation results is 1.80%,and the root mean square error(RMSE)is less than 0.35 m/s.The computational speed of the model is rapid,and the average computational time for obtaining the boiler velocity field is reduced from about 2819 min for CFD simulation to about 3 min.

关 键 词：锅炉速度场 本征正交分解 支持向量机 降阶模型 计算流体力学 

分 类 号：TK09[动力工程及工程热物理]