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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1066-A

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Performance analysis based on experimental data of backpressure steam turbine for cogeneration in saturated steam applications

Guilherme VESCOVI, PROSUMIR - Heat Waste Recovery, Brazil
Gabriel GRAZZIOTIN, PROSUMIR - Heat Waste Recovery, Brazil
Alexandre VAGTINSKI DE PAULA, University of Rio Grande do Sul – UFRGS, Porto Alegre, Brazil, Brazil
Tales SOUZA, CPFL Energia, Campinas, Brazil, Brazil
Jorge GUILLEN, CPFL Energia, Campinas, Brazil, Venezuela (Bolivarian Republic of)
Quan GE, State Grid International Development Co. Ltd, Brazil

Heat waste represents significant energy losses in steam lines. Many industries face this issue, as there are few feasible solutions available for small-scale applications. Pressure reducing valves (PRV) are devices commonly found in steam lines and are an important cause of energy loss. This article presents technical information and measurements from a backpressure axial steam turbine used for cogeneration, replacing a traditional PRV. This paper aims to validate the performance capabilities of a Pressure Reducing Turbine (PRT) with respect to initial predictions based on analytic calculations. The designed equipment was installed in a beverage facility, located in Brazil. The validation procedure applied in this paper consists of analyzing the data collected in several periods of PRT’s operation, accessed remotely via an online server. The data are presented in a set of graphs to study the behavior of two key variables: generated power and effective efficiency. However, the observed boundary conditions differed significantly from expected values, forcing the turbine to operate in off-design conditions. The turbine model was hence refined and used to predict the PRT’s performance in such conditions. Results showed satisfactory accuracy for both power and efficiency predictions.

Keywords: Steam turbine, Cogeneration, Energy efficiency, Heat waste, Saturated steam
Acknowledgment: This work has been funded by CPFL Energia under the ANEEL R&D program PD-00063-3049/2018.