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医疗垃圾多组分热解气化特性 被引量:11
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作者 严建华 祝红梅 +2 位作者 蒋旭光 沈逍江 岑可法 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2008年第5期885-889,共5页
研究了医疗垃圾单组分和多组分的热解气化特性以及单组分热解气化和多组分热解气化间的关系.通过热力学的复杂化学平衡分析,结合物料守恒、能量守恒和化学平衡,对医疗垃圾热解气化产物进行预测.通过热天平试验分析了医疗垃圾多组分的热... 研究了医疗垃圾单组分和多组分的热解气化特性以及单组分热解气化和多组分热解气化间的关系.通过热力学的复杂化学平衡分析,结合物料守恒、能量守恒和化学平衡,对医疗垃圾热解气化产物进行预测.通过热天平试验分析了医疗垃圾多组分的热解气化特性,建立了多组分热解气化的表观动力学模型.结果表明,医疗垃圾的热解气化产物分布主要受过量空气系数影响.表观动力学模型结果与试验结果吻合.混合组分的平衡产物分布和表观动力学模型可以通过各单组分的加权平均来得到. 展开更多
关键词 医疗垃圾 平衡分析 热天平分析 热解气化模型
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Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles 被引量:1
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作者 Alireza Rahbari Fatemeh Ebrahiminasab Mehdi Bidabadi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第10期1114-1120,共7页
This paper presents the combined influence of heat-loss and radiation on the pyrolysis of biomass particles by considering the structure of one-dimensional, laminar and steady state flame propagation in uniformly prem... This paper presents the combined influence of heat-loss and radiation on the pyrolysis of biomass particles by considering the structure of one-dimensional, laminar and steady state flame propagation in uniformly premixed wood particles. The assumed flame structure consists of a broad preheat-vaporization zone where the rate of gas-phase chemical reaction is small, a thin reaction zone composed of three regions: gas, tar and char combustion where convection and the vaporization rate of the fuel particles are small, and a broad convection zone. The analysis is performed in the asymptotic limit, where the value of the characteristic Zeldovich number is large and the equivalence ratio is larger than unity(i.e.u≥1). The principal attention is made on the determination of a non-linear burning velocity correlation. Consequently, the impacts of radiation, heat loss and particle size as the determining factors on the flame temperature and burning velocity of biomass particles are declared in this research. 展开更多
关键词 analytical model heat loss RADIATION particle size PYROLYSIS tlame temperature burning velocity
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Pyrolysis Model of Single Biomass Pellet in Downdraft Gasifier
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作者 薛爱军 潘继红 +1 位作者 田茂诚 伊晓璐 《Transactions of Tianjin University》 EI CAS 2016年第2期174-181,共8页
By coupling the heat transfer equation with semi-global chemical reaction kinetic equations, a onedimensional, unsteady mathematical model is developed to describe the pyrolysis of single biomass pellet in the pyrolys... By coupling the heat transfer equation with semi-global chemical reaction kinetic equations, a onedimensional, unsteady mathematical model is developed to describe the pyrolysis of single biomass pellet in the pyrolysis zone of downdraft gasifier. The simulation results in inert atmosphere and pyrolysis zone agree well with the published experimental results. The pyrolysis of biomass pellets in pyrolysis zone is investigated, and the results show that the estimated convective heat transfer coefficient and emissivity coefficient are suitable. The mean pyrolysis time is 15.22%, shorter than that in inert atmosphere, and the pellet pyrolysis process in pyrolysis zone belongs to fast pyrolysis. Among the pyrolysis products, tar yield is the most, gas the second, and char the least. During pyrolysis, the temperature change near the center is contrary to that near the surface. Pyrolysis gradually moves inwards layer by layer. With the increase of pyrolysis temperature and pellet diameter, the total pyrolysis time, tar yield, char yield and gas yield change in different ways. The height of pyrolysis zone is calculated to be 1.51—3.51 times of the characteristic pellet diameter. 展开更多
关键词 downdraft gasifier pyrolysis model single biomass pellet
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