Seeking an energy efficient and environmentally friendly technology for CO2capture could be promising for reduction of CO2emissions. Membranes have already been commercially used for selected gas separations and have potential to be used for CO2capture. However, process and economic feasibility of membrane separation system significantly depends on not only membrane materials but also process operating conditions. Thus, membrane system design by process simulation was conducted in this work. A single stage membrane unit was designed to accomplish specific separation requirements of >80% CO2capture ratio at a maximum acceptable membrane area 600,000m2. The obtained characteristic diagrams showed that a minimum membrane performance of CO2permeance 2m3(STP)/(m2hbar) and CO2/N2selectivity 135 should be achieved at a stage-cut of 15.2% and a feed and permeate pressure of 2.5bar and 250mbar, respectively. A two-stage membrane system using high performance fixed-site-carrier membranes by integration of compression heat was designed to achieve >80% CO2capture ratio and >95% CO2purity from a 18,260kmol/h flue gas in a refinery. The simulation results showed nice potential for CO2capture with a specific energy consumption of 1.02GJ/ton CO2and a capture cost of 47.87$/ton CO2captured.
|Number of pages||9|
|Journal||Chemical Engineering Journal|
|State||Published - 5 May 2015|
- Capture cost
- Compression heat
- Fixed-site-carrier membranes
- Process simulation