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Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal

Oxygen and steam as gasifying agents are preferred for gasification process compared to air due to the production of higher heating value of syngas and lower contents of diluents. Lower operating temperature is required for low rank coal (LRC) gasification process. This is because, carbon conversion...

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Main Authors: Md. Isa, Kamariah, Osman, Kahar, Abdullah, Nik Rosli, Othman, Nor Fadzilah, Hamid, Mohd. Norhakem
Format: Article
Published: Inderscience Publishers 2019
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/88491/
http://dx.doi.org/10.1504/PCFD.2019.097598
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spelling my.utm.884912020-12-15T00:07:02Z http://eprints.utm.my/id/eprint/88491/ Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal Md. Isa, Kamariah Osman, Kahar Abdullah, Nik Rosli Othman, Nor Fadzilah Hamid, Mohd. Norhakem TJ Mechanical engineering and machinery Oxygen and steam as gasifying agents are preferred for gasification process compared to air due to the production of higher heating value of syngas and lower contents of diluents. Lower operating temperature is required for low rank coal (LRC) gasification process. This is because, carbon conversion will occur faster with high reactivity of LRC. Ash agglomeration formation is also prevented at lower operating temperature. Hydrodynamics of bubbling fluidisation and gasification process are expected to be affected with different gasifying agents and operating temperature. Computational fluid dynamics (CFD) method was used to select suitable superficial velocity for bubbling fluidised bed (BFB) simulation and explore the effects of different gasifying agents at a lower operating temperature. The model was validated with theoretical values and superficial velocities of three to four times the minimum velocity (3~4Umf) were selected due to its best uniform bubbling fluidisation. Different gasifying agents will produce different bubbling patterns which relates to the density and viscosity of the gasifying agents. Many and faster moving bubbles were produced when using oxygen and air at 1,073 K while no changes is detected when using steam. This concludes that air and oxygen as gasifying agents give higher effect to the bubbling hydrodynamics compared to selection of steam as gasifying agent. Inderscience Publishers 2019 Article PeerReviewed Md. Isa, Kamariah and Osman, Kahar and Abdullah, Nik Rosli and Othman, Nor Fadzilah and Hamid, Mohd. Norhakem (2019) Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal. Progress in Computational Fluid Dynamics, 19 (1). pp. 44-54. ISSN 1468-4349 http://dx.doi.org/10.1504/PCFD.2019.097598
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Md. Isa, Kamariah
Osman, Kahar
Abdullah, Nik Rosli
Othman, Nor Fadzilah
Hamid, Mohd. Norhakem
Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
description Oxygen and steam as gasifying agents are preferred for gasification process compared to air due to the production of higher heating value of syngas and lower contents of diluents. Lower operating temperature is required for low rank coal (LRC) gasification process. This is because, carbon conversion will occur faster with high reactivity of LRC. Ash agglomeration formation is also prevented at lower operating temperature. Hydrodynamics of bubbling fluidisation and gasification process are expected to be affected with different gasifying agents and operating temperature. Computational fluid dynamics (CFD) method was used to select suitable superficial velocity for bubbling fluidised bed (BFB) simulation and explore the effects of different gasifying agents at a lower operating temperature. The model was validated with theoretical values and superficial velocities of three to four times the minimum velocity (3~4Umf) were selected due to its best uniform bubbling fluidisation. Different gasifying agents will produce different bubbling patterns which relates to the density and viscosity of the gasifying agents. Many and faster moving bubbles were produced when using oxygen and air at 1,073 K while no changes is detected when using steam. This concludes that air and oxygen as gasifying agents give higher effect to the bubbling hydrodynamics compared to selection of steam as gasifying agent.
format Article
author Md. Isa, Kamariah
Osman, Kahar
Abdullah, Nik Rosli
Othman, Nor Fadzilah
Hamid, Mohd. Norhakem
author_facet Md. Isa, Kamariah
Osman, Kahar
Abdullah, Nik Rosli
Othman, Nor Fadzilah
Hamid, Mohd. Norhakem
author_sort Md. Isa, Kamariah
title Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
title_short Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
title_full Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
title_fullStr Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
title_full_unstemmed Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
title_sort gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal
publisher Inderscience Publishers
publishDate 2019
url http://eprints.utm.my/id/eprint/88491/
http://dx.doi.org/10.1504/PCFD.2019.097598
_version_ 1687393578690543616
score 13.211869

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