Research On The Feeding System Of Fluidized Bed Pyrolysis Device For Biomass Manufacturing Activated Carbon

Biomass is an important treasury of potential energy and chemical raw materials, A lot of biomass energy utilization technology has been already studied. This project is to study the process and method of manufacturing activated carbon from biomass. The fluidized bed device is used for thermal cracking in the process of manufacturing .The purpose of this topic is to study the feeding system in the whole process of manufacturing and Study on the Design the feeding process.This paper first analyzes the advantages and disadvantages of different feeder, Then vacuum feed was selected to be the final project. Feeding tube has an important impact on the feed, study on the particles in different sizes and shapes of the feed pipe in order to select the most suitable vacuum generator.Pneumatic conveying is the way to transfer particulate material by using high speed gas in the pipe. Pneumatic conveying has better effect of dust prevention, so that it can help to realize mechanization, automation and make the work more easily. At present, the simulation of pneumatic conveying is almost two-dimensional, This paper was made a study of gas-solid two phase flow in different diameter and type tubes.Firstly, Turbulent k-? SST model was selected to calculate the flow field information in this paper. Then, the solid particles were simulated by discrete phase model Fluent-DPM.Exploring the interactions between different flow field and solid particles in the process of discrete phase and continuous phase coupling. That is to say: Setting up the calculation model in Fluent, interation step by step until the result of the continuous phase is not changed with the increase of the number of iteration steps. Then coupling calculation will stop. Then inject the particles and tracked by DPM model so that we can get the particle trajectory, the pressure, the particle velocity distribution and so on.The initial velocity of the flow field is set to 6m/s, 20m/s, 30m/s. The feeding pipe is divided into straight pipe,elbow 1,elbow 2 and the diameter of the pipe is 38mm, 51mm,76mm. From the results we can find that the initial velocity of the flow field, size of diameter, shape of the tube have impact on particle motion and the flow field characteristics.There has many difference between different situation. Such as different tube type with same speed, different diameter with Same pipe type, different feed inlet with the same type.From the results,we can find that bend pipe has better acceleration effect than straight one at the same initial speed.The impact of the wall surface in bend tube makes the particle trajectory and pressure distribution become more complex than straight tube.We have already understand the movement of particles in different situations through the simulation, 38mm bend pipe was chosed as the final feed pipe, then we started the platform construction according to the size.