Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MODELING A HYDRO-PNEUMATIC SYSTEM TO ACTUATE A TURBINE INLET BUTTERFLY VALVE
Submission Author:
Talles Augusto Bragagnolo Spada , SC
Co-Authors:
Talles Augusto Bragagnolo Spada, Gregori Picolotto Conterato, Vinícius Vigolo, Leonardo Augusto Weiss, Rafael Haisi Klita, Leonardo Lino Leoncini, Pedro de Araujo, Victor Juliano De Negri
Presenter: Talles Augusto Bragagnolo Spada
doi://10.26678/ABCM.COBEM2019.COB2019-1322
Abstract
The objective of this paper is to develop a mathematical model to analyze the dynamic behavior of a hydro-pneumatic system applied to actuate turbine inlet butterfly valves at small hydropower plants. It is composed of commercial components, which provides good access to various manufacturers and replacement part suppliers. The pneumatic components have a good power-to-weight ratio, lower acquisition cost and clear operation, whereas hydraulic components are robust and work with high pressures and loads. The parameters of the analyzed system are from a commercial equipment designed to supply 30 tons, enough to overcome the torque requirements of the current turbine inlet butterfly valve from a hydropower plant with 438 kW of generation capability, based on parameters provided by REIVAX S/A Automation and Control and requirements from American Water Works Association standards. The aim of the proposed system is to replace the conventional hydraulic actuating systems that use a large amount of oil by this compact system powered by compressed air that uses a considerably smaller oil quantity. The mathematical model was implemented in Matlab Simulink and the results show a smooth displacement of the main actuator, despite the intermittent fluid pumping. Moreover, the hydraulic pressure followed the resistive forces profile accordingly, indicating that with the correct design, the system is suitable for a wide range of hydropower plants.
Keywords
Hydro-pneumatic, Turbine inlet butterfly valve, hydropower plant, modeling
