节流式蒸汽调节阀的改进与性能计算  

Improvement and Calculation of Throttle Control Valve in Steam Turbine

作　　者：高怡秋[1] 周振东[1] 奚骏[1] 

机构地区：[1]中国船舶重工集团公司第704研究所,上海200031

出　　处：《汽轮机技术》2012年第4期261-263,共3页Turbine Technology

摘　　要：蒸汽调节阀由于长期处于小流量、大压差状态下,高速汽流对滑阀表面产生了严重的冲蚀,使其无法正常工作。对调节阀提出改进措施,在低负荷工况时采用了多级小孔降压的结构。给出了多级降压的计算方法,并通过数值计算得到了改进前后的流场分布。计算结果表明改进后的结构可大幅降低汽流速度并增大总压损失系数,改善了汽流的冲蚀作用,提高了蒸汽调节阀的安全可靠性。Due to steam control valve is under the high difference pressure and low flow conditions in a long time, the surface of the slide valve under high-speed flow has serious erosion, which does not work well. The improvement measures of control valve are proposed,that using the structure of multistage depression holes when in low load conditions. The measure of calculation of multistage depression is given, and the flow field before and after is obtained by numerical calculation. The results show that the improved structure can significantly reduce the steam velocity and increase the pressure loss coefficient, which can reform the steam flow erosion and improve the safety and reliability of the steam control valve.

关 键 词：调节阀 套筒 多级降压 冲蚀 流速 马赫数 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]