Abstract
In this paper, a gas-fired combined cycle power plant subjected to a pre-combustion CO2 capture method has been analysed under different design conditions and different heat integration options. The power plant configuration includes the chemical looping reforming (CLR) of natural gas (NG), water gas shift (WGS) process, CO2 capture and compression, and a hydrogen fuelled combined cycle to produce power. The process is denoted as a CLR-CC process. One of the main parameters that affects the performance of the process is the pressure for the CLR. The process is analysed at different design pressures for the CLR, i.e., 5, 10, 15, 18, 25 and 30 bar. It is observed that the net electrical efficiency increases with an increase in the design pressure in the CLR. Secondly, the type of steam generated from the cooling of process streams also effects the net electrical efficiency of the process. Out of the five different cases including the base case presented in this study, it is observed that the net electrical efficiency of CLR-CCs can be improved to 46.5% (lower heating value of NG basis) by producing high-pressure steam through heat recovery from the pre-combustion process streams and sending it to the Heat Recovery Steam Generator in the power plant.
Highlights
IntroductionCO2 emissions through burning of fossil fuels have contributed most to global warming
Over the last century, CO2 emissions through burning of fossil fuels have contributed most to global warming
Net power generated from the steam cycle is high at lower design pressures for chemical looping reforming (CLR) (5–18 bar) since it requires steam for reforming at lower pressures which is extracted from the medium pressure (MP) steam turbine, and lowering the power loss from
Summary
CO2 emissions through burning of fossil fuels have contributed most to global warming. The need for CO2 capture and storage (CCS) from large point source emissions, like power plants, has been well debated and agreed upon. The methods for CO2 capture in power plants have been categorized into post-combustion, pre-combustion and oxy-fuel combustion. The focus is on pre-combustion capture and chemical looping reforming (CLR) in a natural gas (NG) fired power plant. Post-combustion amine absorption is the most mature technology, chemical looping processes, with their ability to inherently separate CO2 , possess a high thermodynamic potential (less exergy destruction) with a low energy consumption for the capture of CO2. Chemical looping processes like chemical looping combustion (CLC) and CLR use metallic oxygen carriers to convert the chemical potential of fossil fuels into work. The concept was proposed by Richter and Knoche [4] and a first-of-its-kind CLC-based power generation cycle was presented by Ishida and
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