A modified correlation to calculate the transport velocity for pressurized chemical looping combustion

Chemical looping combustion (CLC) is a next-generation combustion technology that uses an oxygen carrier in a metal oxide particulate form to supply oxygen that is necessary for combustion. This study analyzed the effect of pressure on the transport velocity with the aim of designing a pressurized CLC. The emptying time method was used to determine the transport velocity with a two interconnected pressurized fluidized bed system. This investigation also verified the feasibility of the existing correlations to predict the effect of pressure on the transport velocity in the gas fluidized bed. A modified correlation that considers the pressure and the particle properties was then proposed. This study demonstrated that the modified correlation led to a smaller difference between the measured transport velocity and calculated values under ambient and pressurized conditions so that the prediction of transport velocity in a pressurized circulating fluidized bed can be expected to be more accurate.