Rotational asymmetry of reactant concentration and its evolution in a circulating fluidized bed riser

Rotational asymmetric distribution of reactant (ozone) concentration and its evolution along with the gas-solid reactive flow were studied in a 76 mm i.d., 10.2 m high circulating fluidized bed (CFB) riser reactor. The superficial gas velocity ranged from 3 to 5 m/s and the solids circulation rates were 50 and 100 kg/(m2 s). Experimental results show that the asymmetry of reactant distribution can extend to a height close to the length of flow developing zone of the CFB riser reactor and then disappears. Based on the hydrodynamics of the gas and solid phases in the solids entrance region, this asymmetry can be attributed to the effect of the solids entrance structure.

. Rotational asymmetry of ozone concentration distribution in the CFB riser reactor.Figure optionsDownload as PowerPoint slideHighlights
► Catalytic ozone decomposition enables studies on rotational asymmetry of reactant distribution in CFB riser.
► Rotational asymmetry can extend to a height close to the length of flow developing zone.
► Rotational asymmetry is intensified with increasing solids circulation rates or reducing superficial gas velocity.
► Solids entrance structure contributes to rotational asymmetry of reactant distributions.