Flow Analysis in a Steam Turbine Control Valve With Through-Flow Valve Chamber

Abstract

The nuclear power plant also includes a secondary cycle, one of the main components of which is a steam turbine. This device processes the thermal and pressure energy of steam and converts it into mechanical energy. The heat from the reactor is conveied to the secondary cycle in the steam generator. Reliable and safe operation of the steam turbine, and thus of the entire block, is ensured by valves. Flow in a pair of control valves is considered, where the steam flows through the valve chamber past the first valve to the second valve. The experimentally determined flow characteristic of both valves is presented. Data of the distribution of pressures in selected places of these valves are presented. For the typical operating characteristics of a turbine, the course of the coefficient of total pressure distribution losses on the surface of the valves is evaluated. The pressure at the bottom of the cone is compared with the pressure on the wall of the diffuser throat. The energy loss in the valves is compared with the loss in a separate diffuser with varying degrees of expansion. There is also distinguished whether the flow is separated out of the diffuser walls or not.

Pressure losses and oscillations in a compact valve of a steam turbine

“…Therefore, the research and development of valves has a long tradition in Doosan Skoda Power Company which also cooperates with a lot of external specialist, for example from the University of West Bohemia, the Czech Academy of Sciences as well as NPO CKTI or MEI in the Russian Federation. A lot of results have been already published such as, for example, [1][2][3][4][5][6][7][8]. In this paper, a control valve of the intermediate-pressure turbine part is investigated.…”

Valve seat angle influence on losses in valves for steam turbines

“…𝛾 is defined by the flowing medium, and 𝐴 𝑠 /𝐴 1 is defined by the valve geometry. Other facts about this amended empirical equation (1), which is based on the source [2], can be found in [5,6]. The most illustrative description and its derivation is going to be published in [8].…”

“…Doosan Skoda Power has performed many studies connected with valves for steam turbines, for example [3][4][5][6][7]. These papers show and analyze different valve models for measurements and numerical simulations using numerical and measured data.…”

Pressure losses reduction in a steam turbine compact valve

“…As can be found in different sources [2][3][4][5][6], valves for steam turbines have become objects for a wide research and development. Doosan Skoda Power along with other external cooperative organizations, in this case with the Institute of Thermomechanics of the Czech Academy of Sciences, has also a strong tradition of valves research [7][8][9][10].…”