1 resultado para by-product recovery
em Digital Commons - Michigan Tech
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Resumo:
The waste tire is belonging to insoluble high polymer elastic materials. It takes hundreds of years to resolve the macromolecules of waste tire into the standard which does not pollute the environment. More and more waste tires are air stored which causes space occupation and mosquito-breeding in the places that will spread diseases. The disposal methods include landfill, stockpiles, dumping and incising into particles. However, all these methods are not technically and economically efficient. The trend for the development of waste tire treatment processes is low cost, on-site, and high product recovery at high energy efficiency. In this project, microwave energy has been applied for treatment of the waste tire in laboratory scale. Experimental conditions were varied in order to find the optimum processing parameters such as temperature and atmosphere. The microwave absorption capability of waste tire rubber was investigated by measuring its dielectric properties from room temperature to 800°C in stagnant air and pure nitrogen atmospheres, respectively, at both 915 and 2466MHz.The dielectric parameters data increase steadily at temperatures below 400°C. At temperatures above 400°C, the relative dielectric loss factor and relative dielectric constant begin to decrease. This is due to the solid phase of tire rubber begins to transform to gas phase and the release of volatiles. The calculations of microwave half-power depth and penetration depth of waste tire rubber show that the pyrolysis process significantly improves the microwave absorption capability of the waste tire rubber at low temperatures. The calculated reflection loss of the waste tire rubber suggests that its maximum microwave absorption can be obtained when the rubber has a thickness of 25mm at 915MHz. The sample dimension has a significant effect on the overall performance of microwave absorption in waste tire during pyrolysis and thus on the efficiency of microwave waste tire rubber pyrolysis.