Evaluation of the potential of retrofitting a coal power plant to oxy-firing using CFD and process co-simulation (original) (raw)
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Energy Procedia, 2009
Oxyfuel combustion is one of the promising technologies to enable CCS for new and existing coal-fired power plants. For retrofit applications, oxyfuel is an attractive option because it does not have major impact on the boiler-turbine steam cycle. This paper presents a case study for retrofitting oxyfuel combustion technology in large state-of-the-art power plants that are originally commissioned and operated in air-fired mode. The overall process design for the modified power plant is outlined; necessary modifications of relevant components are explained. The paper also discusses results of experiments and numerical calculations on combustion behavior in the furnace. Retrofit measures ensure that the power stations still can run under both air-fired and oxyfuel-fired conditions if required by regulations / market conditions. This provides additional operational and commercial benefits for the operator of the plant and reduces the technical risk of implementing new components and processes not yet proven in the power sector.
Process Simulation of Oxy-Fuel Combustion for A 120 MW Coal-Fired Power Plant Using Aspen Plus
International Journal of Natural Sciences Research, 2021
Oxy-fuel Combustion is a technology with the potential of drastically reducing the amount of CO2 emission, it relies on the use of oxygen and recycled CO2 instead of air as the oxidant. This helps to reduce the amount of the CO2 and NOx emissions. This study focuses on the components of flue gas produced and their amounts for oxy-fuel combustion in a coal-fired power plant (CFPP) and also the boiler efficiency using the direct (input-output) method. The combustion process of pulverized coal in a 120MW power plant is studied using Aspen Plus 11. The amount of each component in flue gas in coal-fired processes with air or O2/ CO2 (using recycle of 20%, 40%, 60% and 80% of CO2) as oxidizer was obtained. From the process simulation, as the recycle % of CO2 was increased, the flame temperature, CO and NOx emissions were reduced. The simulation results of air combustion were compared with that of oxy-fuel combustion with 80% recycle and it was seen that the flame temperature dropped from ...
An integrated CFD-Process model for Oxy-coal combustion
2011
Oxy-coal combustion is one of the leading technologies for carbon capture from coal-fi red power plants. System simulation is a vital tool in the development of the novel technology. However, a fundamental challenge in modelling oxy-coal technology is accounting for the impact of increased concentrations of carbon dioxide and water vapour in the combustion gases on heat transfer. This can be done by incorporating a spectral model for the gaseous radiative properties within a CFD combustion model. In order to investigate the impact of an oxy-coal boiler on the power plant operation, this work covers the development of an integrated CFD-Process model for oxy-coal combustion. The model links a detailed CFD calculation of combustion and heat transfer in the furnace, with the steam cycle and overall plant performance which are calculated in a process model. The models are linked by the boundary condition: in the CFD model, the water/steam temperature and the overall heat transfer coeffic...