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Tar reduction in downdraft biomass gasifier using a primary method

Blanco Machin, Einara and Travieso Pedroso, Daniel and Proenza, Nestor and Luz Silvera, José and Conti, Leonetto and Bollini Braga, Lúcia and Blanco Machin, Adrian (2015) Tar reduction in downdraft biomass gasifier using a primary method. Renewable energy, Vol. 78 , p. 478-483. ISSN 0960-1481. eISSN 1879-0682. Article.

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DOI: 10.1016/j.renene.2014.12.069

Abstract

This work present a novel primary method, for tar reduction in downdraft gasification. The principle of this new technology is to change the fluid dynamic behaviour of the mixture, formed by pyrolysis product and gasification agent in combustion zone; allowing a homogeneous temperature distribution in radial direction in this reaction zone. To achieve the change in the fluid dynamic behaviour of the mixture; the entry of gasification agent to combustion zone is oriented by means of wall nozzles in order to form a swirl flow. This modification in combination with the extension of the reduction zone, will allow, to increases the efficiency of the tar thermal cracking inside the gasifier and the extension of the Boudouard reactions. Consequently, the quantity of tar passing through the combustion zone without cracking and the concentration of tar in the final gas, decrease significantly in relation with the common value obtained for this type of reactor, without affecting significantly the heating value of the producer gas. In this work is presented a new design for 15 kW downdraft gasification reactor, with this technology implemented, the tar content obtained in the experiments never overcome 10 mg/Nm3, with a lower heating value of 3.97 MJ/Nm3.

Item Type:Article
ID Code:10800
Status:Published
Refereed:Yes
Uncontrolled Keywords:Biomass, downdraft gasifier, gasification, Tar, Swirl flow
Subjects:Area 03 - Scienze chimiche > CHIM/08 Chimica farmaceutica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier
ISSN:0960-1481
eISSN:1879-0682
Deposited On:17 Feb 2015 10:58

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