Membrane Separation Process for Post-combustion CO2 Capture from Coal-fired Power Plant
Date Issued
2016
Date
2016
Author(s)
Chang, Feng-Lin
Abstract
One promising way to reduce CO2 emissions is post-combustion CO2 capture from flue gas at coal-fired power plant. A wide variety of capture techniques has been proposed and studied. Conventional Amine-based process is the dominate method used for CO2 separation. However, the process is energy-intensive and therefore it becomes very costly. Gas separation membrane process gives an opportunity to be a low cost and low energy consumption option for capturing CO2 from power plant flue gas. In this study, membrane process for post-combustion CO2 capture has been designed, simulated and analyzed by using Aspen Plus® simulation software. A membrane model can be built by Aspen Custom Modeler® (ACM) and then implemented into Aspen Plus®. The reference power plant flue gas data is based on the DOE/NETL report. The membrane parameters (permeance and selectivity) are referred to Polaris® membrane data. The CO2 permeance is 1000 GPU and CO2/N2 selectivity is 50. Membrane design considerations such as pressure ratio, stage cut, flow module, multi-stage configuration and recirculation have been studied to know how they effect on membrane process and help to determine the optimal design. Also, two particular design for post-combustion CO2 capture, water pre-removal and air sweep, will also be discussed. Multi-stage membrane separation process has been designed for capturing 90% CO2 from 550 MW power plant flue gas. The membrane area and power consumption are the key point to determine the cost of the process. They are taken into consideration to decide the optimal design of the process. The optimized case has demonstrated that the required power consumption is 98 MW and the membrane area needed is 1.23 million m2. The 90% CO2 capture is achieved and the final liquefied CO2 product purity can be reached to 97.7%. The CO2 capture cost is about $22/ton and the power consumption of the process (98 MW) only occupy 18% of power plant output。
Subjects
Membrane
Membrane separation process
CO2 capture
Coal-fired power plant
Flue gas
Gas separation
SDGs
Type
thesis
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