Thermodynamic analysis of a 500 MWe coal-fired supercritical power plant with CO2 capture integrated with Kalina cycle for combined cooling and power

Department of Mechanical Engineering, National Institute of Technology Durgapur, Durgapur-713 209,

West Bengal, India

Mejia Thermal Power Station, Damodar Valley Corporation, Mejia-722 183, Bankura, West Bengal, India

E-mail: sujitkarmakar@yahoo.com

Manuscript received online 16 June 2020, revised and accepted 11 August 2020

A thermodynamic study is carried out on a 500MWe coal based supercritical thermal power plant (base plant) with MonoEthanolAmine (MEA) based CO₂ capture unit integrated with a Kalina Cycle (Low-grade energy cycle) setup for Combined Cooling and Power (CCP) generation using Indian High Ash (HA) coal as fuel, and the results are compared with an imported Low Ash (LA) coal. The modelling and simulation of the different plant configurations are done by using the simulation software “Cycle-Tempo”. The base plant is integrated with the CO₂ capture unit working on MEA based post combustion carbon capture technique. The separated CO₂ is compressed to a pressure and temperature of 110 bar& 35°C, respectively for ease of transportation and storage. During the four-stage CO₂ compression the heat wasted through the intercoolers is utilized by using Kalina Cycle System. In Kalina cycle binary mixture of ammonia-water (NH₃-H₂O) is used as a working fluid. This mixture passes through the intercoolers of the CO₂ compression system and got vaporized by utilizing the waste heat. Thereafter, the vapour passes through the two-stage turbines with reheater resulting in additional power generation. The mixture is throttled after the condenser produces the cooling effect. There is about 1.72% of energy efficiency improvement of the proposed integrated plant in comparison with the base plant with CO₂ capture. There is about 1.7 MW of additional electricity generation along with 5.7 MW of cooling effect (equivalent to 1632 TR) are obtained by this novel technique.