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NUMERICAL STUDIES FOR PYROLYSIS, GASIFICATION AND HEAT TRANSFER IN AN RDF FIXED-BED GASIFIER UNDER NON-PREMIXED CONDITIONS

DOI: 10.1615/ICHMT.2008.CHT.2320
11 pages

C. Y. Tsai
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48108

H. G. Im
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48108

T. Y. Kim
Department of Mechanical Engineering, Korea Polytechnic University, Siheung, Kyunggi-Do, Korea

J. Kim
Korea Institute of Energy Research, Daejeon, Korea

Abstrakt

As an attempt to complement experimental development of a solid waste gasifier at Korea Institute of Energy Research (KIER), a full three-dimensional computational model is developed for the complex two-phase flow based on porous medium representation of the solid stack. Compared to our previous work, new improvements in the model include the Lagrangian pyrolysis of solid material with the pyrolysis rate given as a function of the characteristic diameter of the solid waste material. Test simulations adopted the recent experimental modification in which oxidizer is directly injected into the interior of the solid stack of the waste material in order to facilitate oxidizer transport. The results demonstrate that the model properly reproduces the proper morphology of the solid stack and the temperature distribution for various feeding rates.

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