Degradation Effects on Combined Cycle Power Plant Performance—Part III: Gas and Steam Turbine Component Degradation Effects

Abstract

This paper presents an investigation of the degradation effects that gas and steam turbine cycles components have on combined cycle (CCGT) power plant performance. Gas turbine component degradation effects were assessed with TurboMatch, the Cranfield Gas Turbine simulation code. A new code was developed to assess bottoming cycle performance deterioration. The two codes were then joined to simulate the combined cycle performance deterioration as a whole unit. Areas examined were gas turbine compressor and turbine degradation, HRSG degradation, steam turbine degradation, condenser degradation, and increased gas turbine back pressure due to HRSG degradation. The procedure, assumptions made, and the results obtained are presented and discussed. The parameters that appear to have the greatest influence on degradation are the effects on the gas generator.

Aircraft system-level diagnosis with emphasis on maintenance decisions

“…For example, increased tip clearance has been reported by Graf et al 30 to strongly affect all compressor characteristics, while fouling or erosion faults result in a much stronger reduction in the mass flow and isentropic efficiency compared to the pressure ratio, as reported by Igie et al 31 and Zwebek and Pilidis. 32 An area that requires further research is a more precise correlation between the changes in the component characteristics and the fault severity level, since very limited work has been published on this issue. For the purposes of this work, the fault considered in the compressor emulates a fouling condition as described by Zwebek and Pilidis.…”

“…In this paper, there is emulated a turbine fouling condition as reported by Zwebek and Pilidis. 32 This condition results in a decrease in both the mass flow capacity (up to 5%) and the efficiency (up to 2.5%). Also, similarly with the compressor, it is assumed that the turbine's mass flow rate characteristic and the efficiency characteristic present linear changes to each other and with the same number of partitions, as in the compressor case.…”

“…For the purposes of this work, the fault considered in the compressor emulates a fouling condition as described by Zwebek and Pilidis. 32 The fault simulations in this paper consider reduction in the mass flow rate (up to 5%) and decrease in the isentropic efficiency (up to 2.5%), while the pressure ratio characteristic remains unaffected. The simulations carried out consider 500 partitions of the mass flow and efficiency with proportional changes for these characteristics.…”

Characteristics of flow and heat transfer in first stage nozzle of a gas turbine with various flow rates of cooling gas

“…Influence of the gas turbine deterioration on the performance has been reported by many researchers. (Dikunchak, 1992;Spina, 2002;Kurz, et al, 2009;Morini, et al, 2010;Zwebek and Pilidis, 2003a, 2003b, 2003c. In these studies, the deterioration of each part such as the compressor and turbine, was modeled as a change in the aerodynamic and thermodynamic characteristics, and the gas turbine performance was estimated using thermodynamic cycle analyses.…”

Dynamic Simulation of an Organic Rankine Cycle—Detailed Model of a Kettle Boiler

“…The extended surface of the shell side improves the heat transfer for the exhaust gas, whereas the working fluid shows a heat transfer coefficient of at least two orders of magnitude higher and flows inside the tubes [28]. The pressure drop of the exhaust gas on the shell side has a negative impact on the performance of the topping cycle and should be minimized [30][31][32]. Shell-and-tube heat exchangers are applied or assumed for ORC optimization in different studies [33][34][35][36].…”