System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO 2 Power Plant at Full Load and Part Loads

Sreekanth Manavalla, Feroskhan M. (), Joseph Daniel, Sivakumar Ramasamy, T. M. Yunus Khan, Rahmath Ulla Baig, Naif Almakayeel and Bhanu Kiran Voddin Tirumalapur
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Sreekanth Manavalla: Electric Vehicle Incubation, Testing and Research Centre, Vellore Institute of Technology Chennai, Chennai 600127, India
Feroskhan M.: School of Mechanical Engineering, Vellore Institute of Technology Chennai, Chennai 600127, India
Joseph Daniel: School of Mechanical Engineering, Vellore Institute of Technology Chennai, Chennai 600127, India
Sivakumar Ramasamy: School of Mechanical Engineering, Vellore Institute of Technology Chennai, Chennai 600127, India
T. M. Yunus Khan: Department of Mechanical Engineering, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia
Rahmath Ulla Baig: Department of Industrial Engineering, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia
Naif Almakayeel: Department of Industrial Engineering, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia
Bhanu Kiran Voddin Tirumalapur: School of Mechanical Engineering, Vellore Institute of Technology Chennai, Chennai 600127, India

Sustainability, 2023, vol. 15, issue 20, 1-19

Abstract: Super-critical Carbon dioxide (s-CO 2 ) power plants are considered to be efficient and environmentally friendly compared to the traditional Rankine cycle-based steam power plants and Brayton cycle-based gas turbine power plants. In this work, the system design of a coal-fired 100 MWe double reheat s-CO 2 power plant is presented. The system is also optimized for efficiency with turbine inlet pressures and the recompression ratio as the variables. The components needed, mass flow rates of various streams and their pressures at various locations in the system have been established. The plant has been studied based on 1st and 2nd laws at full load and at part loads of 80%, 60% and 40%. Operating parameters such as mass flow rate, pressure and temperature have considerably changed in comparison to full load operation. It was also observed that the 1st law efficiency is 53.96%, 53.93%, 52.63% and 50% while the 2nd law efficiency is 51.88%, 51.86%, 50.61% and 48.1% at 100%, 80%, 60% and 40% loads, respectively. The power plant demonstrated good performance even at part loads, especially at 80% load, while the performance deteriorated at lower loads. At full load, the highest amount of exergy destruction is found in the main heater (36.6%) and re-heaters (23.2% and 19.6%) followed by the high-temperature recuperator (5.7%) and cooler (4.1%). Similar trends were observed for the part load operation. It has been found that the recompression ratio should be kept high (>0.5) at lower loads in order to match the performance at higher loads. Combustion and heat exchange due to finite temperature differences are the main causes of exergy destruction, followed by pressure drop.

Keywords: supercritical carbon dioxide; power plant; double reheat; optimization; exergy analysis; part load (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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