600MW亚临界机组主调阀蒸汽流动损失数值分析  

Numerical analysis on flowing loss of steam flow in a main stop and control valve of a 600MW sub-critical steam turbine

作　　者：邬文睿[1] 万津津[1] 王炜哲[1] 刘应征[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《水动力学研究与进展（A辑）》2008年第5期501-506,共6页Chinese Journal of Hydrodynamics

摘　　要：数值模拟了某600MW亚临界汽轮机主调阀系统内的全三维复杂蒸汽流场,并对其压损过大的原因进行了细致的数值分析。计算中,根据实际运行中的阀门结构和开度等建立了流道模型,并采用多孔介质模型模拟了主汽阀滤网对流场的影响。计算结果表明:主调阀总压损约为8.75%,与实测值8.89%接近;调节阀压损约占总压损的81%。此外,调节阀喉部最高蒸汽流速超过200m/s,所形成的节流现象是该主调阀压损较大的主要原因。In the present study, the complex three-dimensional steam flow through a main stop ＆ control valve system of 600MW sub-critical steam turbine was numerically simulated. A detail analysis of the large pressure loss in the valve system was performed. Geometry of the calculation zone was generated based on the practical conditions, such as valve structure, valve open ratio and so on. Influence of the filter placed in the main stop valve on the steam flow was modeled by using porous zone. The numerical results showed the overall pressure loss of the valve system to be 8.75%, which is consistent to the practical data. The pressure loss in the control valves contributes to 81% of the overall loss. The peaked steam velocities at the throttle of the control valves are all larger than 200m/s, which is attributed to the unexpected the valve system of large pressure loss.

关 键 词：亚临界机组 主汽阀 调节阀 数值模拟 压损 

分 类 号：TK21[动力工程及工程热物理—动力机械及工程]