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On the scaling‐up of a two‐stage air blown entrained flow coal gasifier
Author(s) -
Chen Caixia,
Miyoshi Takahiro,
Kamiya Hidehiro,
Horio Masayuki,
Kojima Toshinori
Publication year - 1999
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450770416
Subject(s) - wood gas generator , flow (mathematics) , coal gasification , slag (welding) , deposition (geology) , coal , scaling , entrainment (biomusicology) , integrated gasification combined cycle , mechanics , environmental science , air entrainment , waste management , petroleum engineering , materials science , engineering , syngas , geology , chemistry , metallurgy , physics , mathematics , paleontology , hydrogen , geometry , organic chemistry , sediment , rhythm , acoustics
A two‐stage air blown entrained flow gasifier is being developed in Japan for the IGCC process. However, its scale‐up up faces significant difficulties because of ash/slag deposition problems. The ash/slag deposition in the gasifier depends on both the ash properties and entrainment produced by the swirling gas flow. Therefore, the flow hydrodynamics are critical issues for the control of the ash behavior. In this paper, a comprehensive simulation model is used to examine the effects of the gasifier geometry and jet configuration on the flow hydrodynamics in order to control the ash deposition on the gasifier walls. A swirl number for the multi‐stage injection swirling gas flow is defined and proved to be the most important hydrodynamic scaling law for the entrained flow gasifier.