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Title: Effects of turbulent mixing and controlling mechanisms in an entrained flow coal gasifier
Authors: Wu, Yuxin
Smith, Philip J.
Zhang, Jiansheng
Thornock, Jeremy N.
Yue, Guangxi
Issue Date: 2-Oct-2009
Publisher: University of Utah, Institute for Clean and Secure Energy
Citation: Preprint: Energy and Fuels
Type: journal article
Pages: 6
Abstract: There is a large range of time and length scales of turbulent fluctuations in an entrained flow coal gasifier. To figure out the turbulent effects on coal gasification processes and the controllingmechanisms of different regions in an entrained flow coal gasifier, the characteristic time and length scales for all major processes are estimated.Onthe basis of the comparison between the length/timescales of turbulentmixing in all ranges and the characteristic time of homo- and heterogeneous reactions, turbulent effects on reactions and coal gasification processes in different regions in an entrained coal gasifier are studied. In the flame region, there is a strong coupling effect between macro-scale turbulent fluctuation and heterogeneous reactions. The combustion of the volatile is strongly affected by the fluctuation of micro-scale Kolmogorov scales because the diffusion boundary layer of the particles is destroyed by this kind of fluctuation. In the nonflame region, the heterogeneous char gasification reactions are not affected by turbulent fluctuations; however, the coupling effect between turbulent mixing and gas-phase reactions should not be omitted.
URI: http://ds.heavyoil.utah.edu/dspace/handle/123456789/10304
Appears in Collections:ICSE Scholarship

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