Basis for an integral malfunctions analysis in thermomechanical systems

Abstract:

Malfunctions in thermomechanical systems could be classified into two categories (Royo, 1994), Intrinsic and Induced. The term intrinsic refers to the internal deterioration of the component; and the term induced when it is operating out of guarantee conditions. Both categories could be characterized by means of their internal parameters (isentropic efficiency, pressure ratio, etc.). It is specially interesting to make use of the internal parameter θ (Royo, 1994, Royo and Valero 1995), and the dissipation temperature Td (Royo, Valero and Zaleta, 1996)) to characterize the components behavior. When intrinsic and induced malfunctions occur simultaneously in a component(s), affecting on overall utility, the assessment of performance losses becomes a very complex task. The aim of this paper is to characterize intrinsic and induced malfunctions on a Power Plant and their impacts. Under the light of the Second Law, also based on the components design, and the manufacturer information, it is possible to understand the malfunction nature (category). This paper introduces some thermodynamic approaches useful for performing the malfunctions effects. These approaches could be the basis for developing an on line monitoring for malfunction detection and performances evaluation in thermal components. This study includes an example of a 350 MW power Plant analysis on High Pressure Steam Turbine and Reheat Steam Turbine Sections. The results obtained from this analysis enable to assess penalties in the Cycle Heat Rate (according to ASME PTC-6), and the present worth of malfunction categories.

Año de publicación:

1997

Keywords:

Fuente:

scopus