Numerical study on pneumatic feeding characteristics of cold-flow fluidized bed reactor for biomass pyrolysis

Comprehensive exploration on the pneumatic feeding characteristics of a fluidized bed can deepen the understanding of biomass pyrolysis. An Euler-Euler model coupled with KTGF is used to simulate the pneumatic feeding process of a two-dimensional cold-flow fluidized bed. The pneumatic feeding mechanism of fluidized bed is analyzed from three aspects: feed gas, feed biomass particles and pneumatic feeding. The feed gas exerts a radial drag force on the quartz sand particles, and merges with the fluidizing gas to promote local fluidization and reduce solid hold-up, which provides feeding space for biomass particles to enter. The radial collision between feed particles and bed materials promotes the diffusion and mixing of particles. And the interaction between feed gas and feed particles promotes them to enter the bed deeper. A dynamic model of pneumatic feeding into the fluidized bed reactor is established, including particle interaction, diffusion, mixing and fluidization together.