A zero carbon emission CCGT power plant and an existing steam power station modernization scheme

Abstract

CO2 emission reduction is one of the major challenges of the future. It is impossible to reject fossil fuels altogether, since renewable energy sources are insufficient to satisfy growing energy demands. Therefore, the creation of a fossil fuel power plant with zero carbon emission becomes an important task.In this work, а combined cycle gas turbine (CCGT) power plant with natural gas oxy-fuel combustion and pressurized heat recovery steam generator is presented. Flue gas water vapor condensation provides low-grade heat utilization and more than 97 % CO2 mass concentration in exhaust gases. The high purity of the captured CO2 simplifies further CO2 use. The evaluated efficiency is 51.6 % without considering the O2 production and CO2 compression costs and 43.5 % if they are included. This plant can compete with the existing CCGT power plants considering the carbon pricing and CO2 capture and storage.The existing power station modernization scheme is proposed in this study. The plant efficiency increases by 8–11 % after modernization. The unification and localization possibility, low capital costs and mass production allow for this scheme in developing countries. The study is based on common Russian power plants and turbines.