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基于超临界直流锅炉的运行数据,建立了炉膛蒸发受热面的静态数学模型,所给出的动量、能量微分方程和完整的IAPWS-IF97物性工业方程相耦合,并给出物性代数方程、动量和能量微分方程组成的混合方程组的求解方法,得到工质参数沿受热面流程的数值解。模型预测结果和试验数据吻合良好。该模型能够根据蒸发受热面的运行环境预测工作状态,确定工质分相点位置,可用于受热面的运行监测和诊断,指导超临界直流锅炉燃烧和汽温控制。
Based on the operating data of the supercritical once-through boiler, a static mathematical model of the heating surface of the hearth was set up. The coupled momentum and energy differential equations were integrated with the complete IAPWS-IF97 physical property equation. The physical algebraic equations, momentum and Energy differential equations consisting of mixed equations solution to get the working fluid parameters along the heating surface of the numerical solution. The model predictions agree well with the experimental data. The model predicts the working status according to the operating environment of evaporating heating surface and determines the position of phase separation point of working fluid. It can be used to monitor and diagnose the operation of heating surface and guide the combustion and temperature control of supercritical once-through boiler.