(111a) Process Configuration Studies of Conventional Pre- and Post-Combustion Carbon Capture for Power Plants
AIChE Annual Meeting
2013 AIChE Annual Meeting
Topical Conference: Advanced Fossil Energy Utilization
Carbon Dioxide Capture From Power Generation II
Monday, November 4, 2013 - 12:30pm to 12:47pm
Process Configuration Studies of Conventional Pre- and Post-Combustion Carbon Capture for Power Plants
Hyungwoong Ahn, Zoe Kapetaki, Pietro Brandani, Mauro Luberti and Stefano Brandani*
Scottish Carbon Capture and Storage Centre (SCCS)
Institute for Materials and Processes, School of Engineering, University of Edinburgh
Mayfield Road, Edinburgh, EH9 3JL, UK
It is well known that an alkanolamine process and a Selexol process are conventional carbon capture processes for post-combustion at the pulverized-coal boiler power plant and for the pre-combustion at IGCC, respectively. The integration of those carbon capture processes into power plants entails considerable energy penalties in power generation.1 However, the energy penalties resulting from pre- and post- combustion carbon capture can be reduced by a modification of process configuration of amine or Selexol process. A sub-critical PC-fired power plant and an IGCC plant based on a Shell gasifier have been simulated using Honeywell UniSim in order to identify the feed composition to capture units and come up with optimised heat integration of power plant and capture unit. Process simulation of ten different amine processes have been constructed using amine thermodynamic package to estimate the energy saving effect resulting from the improved process configuration2.
The Selexol process is configured to have two solvent loops to capture H2S and CO2 simultaneously. Firstly, it is shown that its energy consumption can be lowered when the two capture loops are integrated rather than separated. It is also proposed that the dual-stage Selexol unit can be further improved by introducing a novel cryogenic capture process for CO2 bulk separation integrated with a dual-stage Selexol unit for H2S capture and finishing capture for CO2 purification3.
 Cost and Performances Baseline for Fossil Energy Plants: Vol.1: Bituminous Coal and Natural Gas to Electricity Final Report, DOE/NETL-2007/1281, 2007.
 Ahn, H., Luberti, M., Liu, Z., and Brandani, S., Process Configuration Studies of the Amine Capture Process for Coal-fired Power Plants, Int. J. of Greenhouse Gas Control, Vol. 16, 29-40, 2013.
 Kapetaki, Z., Brandani, P., Ahn, H., and Brandani, S., Process Configuration Studies of a Novel Hybrid Cryogenic/Selexol Process Integrated with an IGCC Power Plant, preparing.