| The Horizontal Air-separator is an important sorting equipment in precedingseparating technology of municipal solid waste. Its separating efficiency not onlyhave a great effect on the rate of recyclable materials’ recovery, but also has directimpact on the subsequent sorting process. Therefore, studying on the process ofseparation has very important significance. The comprehensive effect of wind speed,wind direction, air inlet shape, air inlet size, air inlet position, the shape structure ofHorizontal Air-separator and other parameters, is mainly affected to the separatingefficiency in the MSW (Municipal Solid Waste) sorting process. It’s difficult to selectthe optimal combination process parameters through debugging. So, it is an importanttheory value and practically significance on how to select the best process parametersand ensure that can improve the efficiency of municipal solid waste sorting.In this paper, the actual size of Model TBH-ZYFX-20Horizontal winnowingmachine in a municipal solid waste disposal plant in Changsha is used as a reference,using a combination of numerical simulation and experimental methods to analyzevelocity field and pressure field of garbage winnowing process, define the motion ofthe garbage winnowing process. The main researches are as follows:(1) The mathematical model about the process of sorting in HorizontalAir-separator is established to analyze the Garbage particles motion characteristics ofwindy areas and no wind zone. Then, analyze the influence of the winnowing processparameters on the separation efficiency.(2) The finite element model of the process of sorting in Horizontal Air-separatorwhich is established by using the software of Fluent, then, simulate and analyze thegarbage sorting efficiency of winnowing process. The results show, the air separation efficiency can reach76.5%when the wind direction is15°and velocity is14m/s.(3) Using the single factor method to analyze the impact of different processparameters (wind speed, wind direction, air inlet shape, air inlet size, air inlet position)to the velocity fields and pressure fields in the Horizontal Air-separator. The resultshows, if air inlet is rectangular in shape, inlet height is500mm, the center position ofthe air inlet height is1550mm, the wind speed is14m/s and the wind direction is15°,Garbage sorting process winnowing is most efficient.(4) At last, using the DPM model to simulate the3-D model of mixed MSWwind sorting process. Analysis of the pressure field, velocity vector image, turbulenceand trajectory distribution, then, experiments were done to verify the efficiency ofsorting garbage in Horizontal Air-separator.After simulation, we acquire the impact of flow field in the HorizontalAir-separator with wind speed, wind direction, air inlet shape, air inlet size, air inletposition and the impact of different process parameters to the sorting efficiency. Thereis a certain guiding significance to practical production on groove design and theselection of process parameters. |
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