GTA modeling of combined cycle power plant efficiency analysis

Abstract

A methodology based upon graph theory and matrix method is developed for the efficiency analysis of a Combined Cycle Power Plant (CCPP) with a view that a person at managerial level may decide regarding efficiency improvement without in-depth knowledge of conventional methods of thermal efficiency evaluation. For the analysis, CCPP is divided into six sub-systems and interdependency is identified to develop system structure digraph. Sub-system efficiencies are further dependent on numerous parameters which are interdependent. Therefore, methodology developed at system level is extended to sub-system level. Performance parameter digraph is developed at sub-system level by intriguing inheritance and interdependencies of parameters. Digraph is converted into matrix form and permanent function is developed. The value of permanent function in real time situation is compared with design condition to obtain Relative Efficiency Index (REI) at sub-system level. REI at sub-system level is guidance for deviation of efficiency index from its design value.Ó 2014 Production and hosting by Elsevier B.V. on behalf of Ain Shams University.

Evaluation of gas turbine power plant efficiency using graph theoretic approach

“…7. Under high pressure conditions, combustion efficiency improves with increase in pressure in combustion chamber (Dev et al 2014c). …”

“…The permanent function is a mathematical model that helps determine index that can be used for comparison. GTA is a systematic and logical approach that is applied in various disciplines (Jurkat and Ryser 1966;Deo 2000;Attri et al 2014;Faisal et al 2007;Wani and Gandhi 1999;Kulkarni 2005;Dev et al 2014c). …”

Comparative Study of Different Combined Cycle Power Plant Schemes

“…The potential of chemical reaction and exergy destruction is based upon the Gibbs free energy. Friction is present in flow path due to surface tension of fluids (Dev et al, 2015).…”

“…One approach named as Graph Theoretic Approach (GTA) was used for the reliability analysis. This approach was extended further for the efficiency analysis also (Dev et al, 2015). The results obtained with that methodology were in comparison to the results obtained with exergetic analysis.…”

Analysis of Thermal System

“…Due to high amount of water generation peak combustion temperature is lowered and specific heat of combustion is also increased. In the forthcoming section mathematical modeling for the cogeneration cycle is presented and henceforth discussion on the results is presented [15,16].…”