船用闪蒸罐闪蒸性能仿真研究

Abstract

以船用闪蒸罐为原型，在合理假设基础上，建立了闪蒸罐变质量系统热力学模型。采用Simulink搭建闪蒸仿真程序，进行了不同运行工况下船用闪蒸罐闪蒸性能仿真研究，仿真结果表明随着闪蒸罐初始水温下降，过热度增加，闪蒸过程中流体温度变化率增大。在不同背压和初始温度下得到的压力和温度变化规律与试验值吻合较好，最大相对偏差为5%。变质量系统热力学模型在闪蒸罐闪蒸性能仿真计算中的成功应用，可为船舶蒸汽动力系统设计提供一定的理论依据。 Taken marine flash tank as the prototype, the variable mass system thermodynamics model of flash tank was built based on the reasonable assumptions. The simulation program was compiled based on Simulink code. Study on flash evaporation performance for marine flash tank was conducted at different operating conditions and rules of variation of the key thermal-hydraulic parameters were obtained. Simulation results revealed that the change rate of fluid temperature increased due to lower initial temperature and higher superheat. Meanwhile, the results, which were obtained in different backpressure and initial temperature, agreed well with experimental data. The maximum relative deviation arrived at 5%. The successful application of variable mass system thermodynamics model in the simulation of the flash tank performance can supply some theoretical basis for ship steam power system design.