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pyrolysis model of Single Biomass Pellet in Downdraft Gasifier

Transactions of Tianjin University 2016年第2期22卷 174-181页

作者：薛爱军潘继红田茂诚伊晓璐 School of Energy and Power Engineering Shandong University Jinan 250061 China Energy Research Institute Shandong Academy of Sciences Jinan 250014 China

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.

关键词： downdraft gasifier pyrolysis model single biomass pellet

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Downer reactor simulation and its application on coal pyrolysis:A review

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Carbon Resources Conversion 2022年第1期5卷 35-51页

作者： Xueer Pan Wenhao Lian Jingxuan Yang Junli Wang Zhonglin Zhang Xiaogang Hao Abuliti Abudula Guoqing Guan School of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Technology North University of ChinaTaiyuan 030051China Department of Chemistry and Environmental Engineering Shanxi Datong UniversityDatong 037009China Laboratory of Energy Conversion Engineering Institute of Regional Innovation(IRI)Hirosaki University2-1-3 MatsubaraAomori 030-0813Japan

pyrolysis technology has received increasing attention in recent years due to its great potential in the field of lowrank coal clean and efficient *** pyrolysis reaction is very fast and prone to overreaction,the downer-type reactor is considered as a pyrolyzer due to its unique plug flow reactor ***,the low solids holdup,which is not beneficial for the fast heat transfer,limits its industrial ***,how to realize high-density operation is crucial to the successful application of the downer ***,the definition and strategies of high-density operation in the downer were introduced at *** then,considering the increasing influence of computational fluid dynamics(CFD)in the fluidization industry,the state-of-the-art progress in downer simulation was reviewed,in which the newly developed drag models for downers were carefully discussed and ***,to help prediction of the pyrolysis behaviors,the widely used pyrolysis kinetic models were systematically *** with the potential of the downer in the field of coal pyrolysis,the relevant research progress of hot-state simulation of the downer pyrolyzer were introduced and ***,the suggestions on how to carry out follow-up work were *** is expected that this review could give a better understanding for designing and optimizing downer pyrolyzer.

关键词： Downer pyrolyzer High-density operation Computational fluid dynamics(CFD) Drag model pyrolysis model

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