Abstract
In Pakistan, the thermal efficiency of the power plants is low because of a huge share of fuel energy is dumped into the atmosphere as waste heat. The ORC (Organic Rankine Cycle) has been revealed as one of the promising technologies to recover waste heat to enhance the thermal efficiency of the power plant. In current work, ORC is proposed as a second bottoming cycle for existing CCPP (Combined Cycle Power Plant). In order to assess the efficiency of the plant, a thermodynamic model is developed in the ESS (Engineering Equation Solver) software. The developed model is used for parametric analysis to assess the effects of various operating parameters on the system performance. The analysis of results shows that the integration of ORC system with existing CCPP system enhances the overall power output in the range of 150.5-154.58 MW with 0.24-5% enhancement in the efficiency depending on the operating conditions. During the parametric analysis of ORC, it is observed that inlet pressure of the turbine shows a significant effect on the performance of the system as compared to other operating parameters.
Highlights
Gas turbine power plants play a vital role to convert fossil fuel energy to electricity, their overall efficiency is not up to the mark and considered to be less efficient
Parametric analysis of the modified CCPP has been carried out to show the influence of operating parameters such as OTIP, Ψ, APDorc and PPDorc on the performance of the system
The results show that selected operating parameters have a significant influence on the various performance parameters
Summary
Gas turbine power plants play a vital role to convert fossil fuel energy to electricity, their overall efficiency is not up to the mark and considered to be less efficient. Memon, et al [3] have concluded through detailed analysis of CCPP that overall power output decreases with a rise in PR while energy efficiency increased with an increment in PR until it reaches 12 for given value of CIT and GTIT. The current study emphases on the techniques to recover the waste heat of CCPP to optimize the thermal efficiency of the plant This waste heat is a low-grade heat, in order to utilize this waste heat for power generation, some new technologies like the ORC [4], Goswami Cycle [5], Kalina Cycle [6] and trilateral flash cycle [7] were used and analyzed. While enhancement of power output (WORC,net), an increase in overall power output (Woverall), EnE (Energy Efficiency) and exhaust gas temperature (TEX) are nominated as performance parameters
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