Simulation & Design Of Vibration Air Classifier For MSW

In the process of municipal solid waste(MSW)being used for incinerate the power generation,due to the waste material contains a lot of glass,iron materials,ceramics and other non-combustible heavy materials,the calorific values of waste combustion are reduced.After burning,a large amount of residue is produced at the bottom of the furnace,which is difficult to remove and reduces the economic benefits of generating electricity through refuse incineration.This research topic comes from the cooperation program of Jiangsu Huahong Technology Stock Co.Ltd.and puts forward the theory of sorting the municipal solid waste pretreatment material with the combination of vibration and winnowing,Compared with the traditional horizontal type winnowing equipment,vibration air classifier's separation rate is higher and the consumption of energy is less,improves the economic profits of MSW incineration obviously.Vibration and winnowing sorting was combined to separate the plastic particles and glass particles in MSW pre-treatment materials,and discrete element coupling simulation was used to design the optimal parameters of vibration air classifier.According to the working principle of the double air-knife vibration air classifier manufactured by GK Company in USA,the mathematical model of the material particles when they are in the vibration air classifier was established,and the moving laws when the materials are in the vibration plate and air classing square were analyzed.The main factors that influence the materials separation rate and separation efficiency in the vibration air classifier include amplitude,frequency,direction angle of vibration,inclination angle of the vibration box,wind speed and wind speed deflection.The six-factor and three-level orthogonal simulation experiment was carried out by utilizing EDEM-Fluent coupling.The materials velocity curve along vibration plate?materials moving state?wind field velocity vector curve and the separation rate and average separation time of plastic particles and glass particles were obtained,and the optimal design parameters were attained after analyzing them,which are vibration box amplitude 6mm,frequency 7.5Hz,vibration direction angle 45°,vibration box dip angle 8°,wind speed 30m/s,wind speed deflection 15°.In order to ensure the uniform and steady of the wind in the air box outlet,where the wind speed is 30m/s,wind speed deflection is 15°,and Fluent was used to design the structure of air box.The coupling simulation was done by using the experiment vibration box and the working parameters of the experiment device were got.The experiment results were used to verify the simulation and their results were analyzed contrastively.The separation rate and average separating time of the plastic particles and glass particles obtained from experiment and simulation were almost the same,which can strongly support the engineering design of vibration air classifier.The design modeling of vibration air classifier was done,and the vibration motor,master vibration spring,isolation spring,air blower were calculated and selected.In this paper,a detailed study was made on the vibration winnower,and a new method was provided to solve the separation problem of light and heavy materials in MSW.The effect that different parameters exert on the separation rate and average separation time of plastic particles and glasses was researched,and the optimal design parameters of the vibration winnower were obtained,which can offer theoretical reliance and reference for the engineering design of vibration winnower.