首页|Numerical study on waste polyethylene pyrolysis driven by self-sustaining smoldering

Numerical study on waste polyethylene pyrolysis driven by self-sustaining smoldering

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Polyethylene is the type of waste plastic that accounts for the most significant proportion of municipal solid waste.Waste polyethylene can be valorized via pyrolysis and produce value-added oil,gas,and char.On the other hand,self-sustaining smoldering is an emerging technical means to deal with sand/soil contaminated by organic matter.The high-temperature heat generated by smoldering can be used as a heat source for pyrolyzing waste polyethylene.Therefore,this study investigates numerically the pyrolysis of waste polyethylene driven by self-sustaining smoldering.A novel 4-step lumped kinetic model is proposed for simulating the pyrolysis of waste polyethylene.The results indicate that the operating parameters can determine the pyrolysis product yields by regulating the pyrolysis temperature and the volatile residence time.Note that higher temperatures and longer residence times favor the generation of shorter-chain pyrolysis products because of the intensified volatiles'sec-ondary cracking.It can be concluded that a high interface-wall heat transfer coefficient(400 W m-2 K-1),a low PE content(0.20),a high char concentration(2.4％),and a moderate air velocity(0.040 m s-1)are beneficial to oil yield.To some extent,this study may broaden the boundaries for the application of self-sustained smoldering-driven pyrolysis.

self-sustained smolderingwaste polyethylenethermal decompositionoil productionwaste valorization

PAN RuMing、WU YiBo、GUENE LOUGOU Bachirou、SHUAI Yong、DEBENEST Gérald

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School of Energy Science and Engineering,Harbin Institute of Technology Harbin 150001,China

Institut de Mécanique des Fluides de Toulouse(IMFT)-Université de Toulouse,CNRS-INPT-UPS,Toulouse 31400,France

China National Key Research and Development Plan ProjectNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2018YFA07023005195041059052227813

2024

10.1007/s11431-023-2549-3

中国科学:技术科学(英文版)
中国科学院

中国科学:技术科学(英文版)

CSTPCDEI
影响因子：1.056
ISSN：1674-7321
年,卷(期)：2024.67(2)
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