螺旋管式直流蒸汽发生器的准稳态数学模型

Simulation of a once-through,helical-coiled steam generator of high temperature gas-cooled reactor

为了满足模拟机实时仿真核电站一、二回路工况的需要,根据流体的质量、动量和能量守恒原理,建立了适合模拟机要求的螺旋管式直流蒸汽发生器的准稳态数学模型。该模型将蒸汽发生器作为单管模型处理,并根据水的状态将蒸汽发生器分为单相水段、两相段和过热段三大段,每大段又细分若干小段。该数学模型方程采用变步长四阶龙格库塔法联立求解一、二次侧主要热工参数。对典型工况的稳态仿真计算和研究分析表明,该模型是正确的。

A quasi-static model of a helical coiled once-through steam generator of high temperature gas-cooled reactor-pebble bed module （HTR-PM） is developed based on the fundamental conservation of fluid mass, energy and momentum. The steam generator is handled with single tube concept and is divided into three regions as subcooled region, boiling region and superheated region. The equations are solved by changing-step Rung- Kutta method. The steady-state simulation results agree well with the design data. So the model and the methodology are reasonable.