Oxygen Carrier Granulation for Chemical Looping Processes

Chemical looping processes require low cost and higher reactive lattice oxygen carrier, especially for heavy hydrocarbon materials such as coal, biomass and so on. They contain ash and catalytic poison which deactivates lattice oxygen carrier. Spray drying granulation was applied to granulate various kind of particles to support the lattice oxygen carrier. Simultaneous spray drying granulation and post composite method were tested by changing the granulation conditions to reduce the amount of oxygen carriers. Furthermore, various factors were discussed affecting on the reactivity and strength of the granulated particles. Conclusive remarks are as follows. With increasing the calcination temperature, the strength of the granulated particles was increased. However, the specific surface area of them was decreased gradually. On the other hand, the reactivity of them kept almost constant regardless of the decrease of the specific surface area. It was thought that the distribution of the lattice oxygen carrier and voidage in the granulated particles were important.