Precombustion carbon capture

The following example illustrates the potential of membrane-separation processes for precombustion carbon capture in an IGCC. This approach avoids using an expensive air-separation unit (asu) or a difficult-to-implement high-temperature mixed-ion conducting membrane process however, it still enables capture of C02 at purities suitable for commercial use or sequestration. 

The potential for carbon capture and sequestration (CCS) and precombustion decarbonization expand possibilities for the sustainable use of conventional fossil energy carbonthis area during the 2009-2015 term may be gasification related. Currently, Task 27 - Near-Term Market Routes to Hydrogen by Co-utilization of Biomass as a Renewable Energy Source with Eossil Euels addresses many of these issues. This task seeks to advance the development... 

While carbon dioxide capture technologies are new to the power industry, they have been deployed for the past 60 years by the oil, gas, and chemical industries. They are an integral component of natural gas processing and of many coal gasification processes used for the production of syngas, chemicals, and liquid fuels. There are three main carbon dioxide capture processes for power generation (1) postcombustion, (2) precombustion, and (3) oxyfuel. 

Precombustion capture involves separating the carbon dioxide as part of the combustion or before the coal is burned. The coal is first gasified with a controlled amount of oxygen to produce... 

Herm ZR, Swisher JA, Smit B et al (2011) Metal-organic frameworks as adsorbents for hydrogen purification and precombustion carbon dioxide capture. J Am Chem Soc 133 5664-5667... 

Schematically, CO2 capture can be achieved following three main strategies (Figure 39.1) [12] (1) oxy-combustion (or oxy-fuel combustion) where the fuel combustion is performed with pure or enriched O2 instead of air, so that a CO2/ H2O mixture is produced (2) pre-combustion, where the carbon from the fuel is removed prior to combustion (decarbonization) either as CO2, as coke, or in other forms, and whereby the primary fuel heating value is transformed into H2 through partial oxidation, steam reforming, or autothermal reforming with subsequent water-gas shift (WGS) reaction and (3) post-combustion, where CO2 recovery is performed at the end of pipe from a wet exhaust flue gas, usually at 10-30% (v/v) CO2 concentration. The target separations to achieve in these processes to make them feasible are O2/N2 for oxy-combustion, CO2/H2 for precombustion, and CO2/N2 for post-combustion CO2 capture.

Babu P, Kumar R, Linga P (2013) A new porous material to enhance the kinetics of clathrate process application to precombustion carbon dioxide capture. Environ Sci Technol 47(22) 13191-13198... 

Li X-S, Xia Z-M, Chen Z-Y, Wu H-J (2011) Precombustion capture of carbon dioxide and hydrogen with a one-stage hydrate/membrane process in the presence of tetra-n-butylammonium bromide (TBAB). Energy Fuels 25(3) 1302-1309... 

G. Krishnan, I. S. Jayaweera, Fabrication and scale-up of polybenzimidazole (PBI) membrane based system for precombustion based capture of carbon dioxide , 2011 NETL C02 Capture Technology Meeting, August 2011. 

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