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Experiment Study On Pyrolysis Characteristics Of MSW Under The Nonisothermal And Isothermal Condition

Posted on:2007-10-26Degree:MasterType:Thesis
Country:ChinaCandidate:C S BaiFull Text:PDF
GTID:2121360185987892Subject:Engineering Thermal Physics
Abstract/Summary:PDF Full Text Request
The deposition of the increasing municipal solid waste (MSW) has become one of the serious worldwide issues.The thermal treatment technology has become the dominant technology for MSW because of low pollution releasing.The kinetic parameters for pyrolysis of MSW are important to the design and operation of thermal incineration systems. For the lack of kinetic parameters of MSW pyrolysis, many incineration systems are operated under non-optional conditions.By using the fast pyrolysis experimental system which be designed by ZheJiang University , this paper studies the pyrolysis characteristics of typical components and their mixtures of MSW under the nonisothermal and isothermal condition.Under the nonisothermal condition, the results about pyrolysis characteristics of typical components and their mixtures of MSW show that MSW is not pyrolysised at all temperature region, even if the temperature is higher than the initiative pyrolysis temperature, the pyrolysis is not continuous and it occurs one or more interval temperature regions. Under the nonisothermal condition, the mix component decomposition process is not basic the different single component decomposition mutual influence. When in addition, single component and water mix thermal decomposition, the external moisture doesn't exist mutual influence .Under isothermal condition, the results show that the pyrolysis of MSW nearly all is occurred on one time range, but it's initiative time and terminal time is not same. The environment temperature, materials mass, external water and mixture will be influence the pyrolysis characteristics.Under nonisothermal and isothermal condition, The reaction mechanism aboutMSW pyrolysis can not generally described by f(α) = 1- α orf(α) = (1-α)~n ,existence optimal pyrolysis model. The optimal pyrolysis model canprecisely reflect relations of α (thermal decomposition weightlessness conversion rate) and T (temperature), most can precisely reflect the reaction mechanism.The method of nonisothermal mainly is used to study whether the influence is...
Keywords/Search Tags:MSW, Thermogravimetry analysis, Nonisothermal pyrolysis, Isothermal pyrolysis (Fast pyrolysis), Typical components, Mixed components, Pyrolysis kinetics, Optimal model, Reaction mechanism
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