CFD modeling of coal pyrolysis in externally heated fixed-bed reactor
Qian, Yanan1,2; Yu, Yin3; Xu, Guangwen1,4; Liu, Xiaoxing1,2
Source PublicationFUEL

A three dimensional transient model was developed to simulate the pyrolysis process of low-rank sub-bituminous coal in a laboratory-scale externally heated fixed-bed reactor. The water evaporation and the release of volatiles were taken into account in the model. The simulation was first validated by the central temperature evolution of reactor. The evolution of bed temperature, generation of gaseous products, variation of voidage and its influence on the flow behavior of gaseous products were further analyzed. The obtained results show that the phase change of moisture determined the heating process, delaying the temperature of inner coal zone increase above the boiling temperature and consequently the start of pyrolysis. The non-uniform radial distribution of voidage led to the phenomenon that gaseous products generated in the inner low temperature zone tended to flow radially towards heating wall before flowing out the reactor. Analyses indicate that in the temperature range of intense volatiles release the dominant heat transfer mechanism was radiation.

KeywordCoal Pyrolysis Cfd Water Evaporation And Condensation Volatiles Heat Transfer
WOS KeywordBiomass Fast Pyrolysis ; High-quality Tar ; Thermal-conductivity ; Numerical-simulation ; Fluidized-beds ; Weighted-sum ; Gases Models ; Gray Gas ; Devolatilization ; Particles
Funding ProjectNational Natural Science Foundation of China[21576265] ; Nippon Steel Arts Foundation[U1630105] ; National Basic Research Program of China[2014CB744303]
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China ; Nippon Steel Arts Foundation ; National Basic Research Program of China
WOS IDWOS:000441893200074
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Document Type期刊论文
Corresponding AuthorLiu, Xiaoxing
Affiliation1.Chinese Acad Sci, Inst Proc Engn Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CAEP, Natl Key Lab Shock Wave & Detonat Phys, Inst Fluid Phys, Mianyang 621900, Peoples R China
4.Shenyang Univ Chem Technol, Inst Ind Chem & Energy Technol, Shenyang 110142, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Qian, Yanan,Yu, Yin,Xu, Guangwen,et al. CFD modeling of coal pyrolysis in externally heated fixed-bed reactor[J]. FUEL,2018,233:685-694.
APA Qian, Yanan,Yu, Yin,Xu, Guangwen,&Liu, Xiaoxing.(2018).CFD modeling of coal pyrolysis in externally heated fixed-bed reactor.FUEL,233,685-694.
MLA Qian, Yanan,et al."CFD modeling of coal pyrolysis in externally heated fixed-bed reactor".FUEL 233(2018):685-694.
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