Abstract
To solve the inherent problems that bridging and agglomeration phenomena of biomass feedstock existing in the biomass pyrolysis process, and the pyrolysis by-product can not be recycled reasonably, a novel conical bottom pneumatic spout feeder was designed, which used a conical hopper, pressure chamber and inclined spout pipe and utilized the gravitational potential energy of biomass to achieve a continuous and stable feeding process. Various tests were conducted experimentally to obtain the feeding characteristics of the new feeder, where different parameters of biomass and spout pipes were included. The results showed that a high moisture content and a large particle diameter had negative impacts on the feeding. The inclined angle and inner diameter (ID) of the spout pipe at the optimal feeding effect were 30°, 20mm, respectively, and the optimal range of spout gas velocity was 5-7m/s. A physical model of gas-solid flow was established based on Ergun and Bernoulli equations, and the mathematical correlation of the feeding rate was obtained. The deviation between the calculated values and the experimental values was within ±7%, indicating that the model had a high predict accuracy.
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