Gas-Solid Two-phase Vortex Flow Characteristics in Guide Vane Type Cyclone Reactors of Biomass Pyrolysis

Abstract:

Based on the shortcomings of existing reactors in ex-situ catalytic pyrolysis of biomass vapors, the guide vane type cyclong reactor was designed. The gradient distribution and residence time distribution of solid phase in the reactor were studied by using computational fluid dynamics method and pulse tracer experimental method. The research could provide an important theoretical basis for technology improvement of ex-situ biomass catalytic pyrolysis and further design of the reactor. The simulated model was confirmed to be right by comparing with the results of the experiment. The results showed that the gas-solid two phases had good mixing contact and separation effects under the action of the Coriolis and centrifugal force in the vortex flow field of different intensities, which provided a key precondition for the realization of reaction separation integration process in the reactor. When the catalyst particle diameter was 10μm and the catalyst to gas ratio was 10.5, the optimal mixing and separation effect of the reactor was achieved. The residence time distribution curves of catalyst particles showed a smooth single peak distribution with small trailing tail, and the average residence time was 1.055~1.235s. The flow pattern of catalyst particles in the reactor was close to the plug flow.