(197c) Chemical Looping Combustion Process Applied to Liquid Fuels

To develop new technology for CO2 capture with less or even no energy penalty, chemical looping combustion was proposed as a novel combustion, which may make a breakthrough in CO2 capture by use of no special CO2 separation equipment and no energy penalty. CLC process is an oxy-combustion technology in which the oxygen required for combustion is supplied by metal oxides known as oxygen carriers.

The majority of the work performed to date on CLC has been performed using methane and coal and/or pet coke as the fuel. Up to now, there is no information reported in the literature concerning the use of liquid fuels in CLC. The objective of the present work is therefore to investigate the feasibility of liquid feed injection and contact with oxygen carrier in CLC conditions. A batch experimental fluidized bed set-up was developed to contact alternatively oxygen carrier with liquid fuels or air. NiAl0.44O1.67 was used as oxygen carriers in a fluidized bed reactor and dodecane as the combustible. The fluidized bed experiment results showed that during the reduction period, all the dodecane was converted. A high concentration of CO2 (> 99%) could be achieved. There is no formation of carbon on the oxygen carrier during the reduction step. In this study, the combustion of dodecane was carried out successfully, producing CO2 and H2O at 100% fuel conversion with stable operation.