Syngas Combustion Characteristics Of Four Oxygen Carrier Particles For Chemical-looping Combustion In A Batch Fluidized Bed Reactor

摘要

Syngas combustion characteristics of oxygen carrier particles have been investigated. Experiments were performed on four oxygen carrier particles in a fluidized bed reactor. All four oxygen carrier particles showed high gas conversion, high CO_2 selectivity, and low CO concentration in the reducer and very low NOx (NO, NO_2, N_2O) emissions in the oxidizer. Moreover, all particles showed good regeneration ability during successive reduction-oxidation cyclic tests up to the 10th cycle. The results indicate that inherent CO_2 separation, NOx-free combustion, and long-term operation without reactivity decay of oxygen carrier particles are possible in a syngas fueled chemical-looping combustion system with NiO/bentonite, NiO/NiAl_2O_4, Co_xO_y/CoAl_2O_4, and OCN-650 particles. However, Co_xO_y/ CoAl_2O_4 represented slight decay of oxidation reactivity with the number of cycles increased and the oxidation rate slower than other particles.