Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature

Combining a methanation step with biomass gasification requires an intensive tar removal process that reduces its content down to 1 mg/Nm3. In this paper, low temperature processes are suggested for treating tar and reducing its content to the acceptable limit. However, the gas must be pre-treated p...

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Autores principales:	Rita Harb, Rodrigo Rivera-Tinoco, Barbar Zeghondy, Chakib Bouallou
Formato:	article
Lenguaje:	EN
Publicado:	AIDIC Servizi S.r.l. 2021
Materias:	Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895
Acceso en línea:	https://doaj.org/article/f5d9270158b44a4a93f2aa77ce5471f8
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spelling	oai:doaj.org-article:f5d9270158b44a4a93f2aa77ce5471f82021-11-15T21:47:31ZModelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature10.3303/CET21881522283-9216https://doaj.org/article/f5d9270158b44a4a93f2aa77ce5471f82021-11-01T00:00:00Zhttps://www.cetjournal.it/index.php/cet/article/view/11945https://doaj.org/toc/2283-9216Combining a methanation step with biomass gasification requires an intensive tar removal process that reduces its content down to 1 mg/Nm3. In this paper, low temperature processes are suggested for treating tar and reducing its content to the acceptable limit. However, the gas must be pre-treated prior to the low temperature process in order to reduce its temperature, its moisture content and the heavy tar fraction. Two water scrubbers are placed prior to the low temperature tar removal process. Benzene and toluene remains in the producer gas after the scrubbers. Those two components can be valorised if separated from the producer gas at low temperature. The tar removal, at low temperature, induces the water vapour frosting remaining in the producer gas. The simultaneous frosting and condensation takes place over a cold plate. Modelling simultaneously the multi-component frost growth and condensation requires complex mathematical approach. A parametric study is completed to assess the impact of the wall temperature and the producer gas flow rate on the tar removal process function of time and plate length. Results showed that a wall temperature of -20 (C is required to lead to the benzene frost formation for an initial molar fraction of 0.024. After one hour, the thicknesses of benzene and ice frost layers reach 1.5 and 2.5 mm, respectively. Therefore, the heat transfer between the gas and the cold surface is reduced.Rita HarbRodrigo Rivera-TinocoBarbar ZeghondyChakib BouallouAIDIC Servizi S.r.l.articleChemical engineeringTP155-156Computer engineering. Computer hardwareTK7885-7895ENChemical Engineering Transactions, Vol 88 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895
spellingShingle	Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895 Rita Harb Rodrigo Rivera-Tinoco Barbar Zeghondy Chakib Bouallou Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature
description	Combining a methanation step with biomass gasification requires an intensive tar removal process that reduces its content down to 1 mg/Nm3. In this paper, low temperature processes are suggested for treating tar and reducing its content to the acceptable limit. However, the gas must be pre-treated prior to the low temperature process in order to reduce its temperature, its moisture content and the heavy tar fraction. Two water scrubbers are placed prior to the low temperature tar removal process. Benzene and toluene remains in the producer gas after the scrubbers. Those two components can be valorised if separated from the producer gas at low temperature. The tar removal, at low temperature, induces the water vapour frosting remaining in the producer gas. The simultaneous frosting and condensation takes place over a cold plate. Modelling simultaneously the multi-component frost growth and condensation requires complex mathematical approach. A parametric study is completed to assess the impact of the wall temperature and the producer gas flow rate on the tar removal process function of time and plate length. Results showed that a wall temperature of -20 (C is required to lead to the benzene frost formation for an initial molar fraction of 0.024. After one hour, the thicknesses of benzene and ice frost layers reach 1.5 and 2.5 mm, respectively. Therefore, the heat transfer between the gas and the cold surface is reduced.
format	article
author	Rita Harb Rodrigo Rivera-Tinoco Barbar Zeghondy Chakib Bouallou
author_facet	Rita Harb Rodrigo Rivera-Tinoco Barbar Zeghondy Chakib Bouallou
author_sort	Rita Harb
title	Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature
title_short	Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature
title_full	Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature
title_fullStr	Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature
title_full_unstemmed	Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature
title_sort	modelling of physical method for tar elimination from producer gas at low temperature
publisher	AIDIC Servizi S.r.l.
publishDate	2021
url	https://doaj.org/article/f5d9270158b44a4a93f2aa77ce5471f8
work_keys_str_mv	AT ritaharb modellingofphysicalmethodfortareliminationfromproducergasatlowtemperature AT rodrigoriveratinoco modellingofphysicalmethodfortareliminationfromproducergasatlowtemperature AT barbarzeghondy modellingofphysicalmethodfortareliminationfromproducergasatlowtemperature AT chakibbouallou modellingofphysicalmethodfortareliminationfromproducergasatlowtemperature
_version_	1718426821011177472

Modelling of Physical Method for Tar Elimination from Producer Gas at Low Temperature

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