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Titre du document / Document title

Simulation and design of a bagasse gasifier

Auteur(s) / Author(s)

HOBSON P. A. (1) ; JOYCE J. A. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Queensland University of Technology, Brisbane, AUSTRALIE
(2) Formerly Sugar Research Institute, Currently James Joyce and Associates, Mackay, AUSTRALIE

Résumé / Abstract

An evaluation of options for the practical implementation of a novel biomass reforming concept has been carried out. This concept utilises the potassium that occurs naturally in biomass as a catalyst in cracking high molecular weight tars produced during gasification to deliver a high quality syngas. One of the primary objectives was to develop a process which yielded a gas with the highest possible fuel heating value, relative to that of the original bagasse fuel. This ratio is termed cold gas efficiency (CGE). Initially, a first law of thermodynamics analysis (simple mass/atomic species and energy balances) was carried out in which the preferred operating regimes were identified in terms of basic process parameters. Both deterministic and Monte Carlo analyses were performed using the first law models. Key findings from this preliminary analysis included: beyond the minimum steam requirement, maximum cold gas efficiency (CGE) is achieved by avoiding any further increase in the ratio of steam to dry ash free (d.a.f.) bagasse; the theoretical minimum steam requirement to fully convert all of the carbon in the bagasse to a gas of maximum heating value is approximately 13.5 wt% of the fuel (d.a.f. basis); without chemical recuperation, char/coke yields in excess of 12 wt% on a d.a.f. basis (characteristic of the process in question) will lead to suppression of the CGE. The Monte Carlo sensitivity analysis indicated a 90% probability of achieving a CGE of between 62% and 85% given the range of process parameters considered. Five basic concepts were evaluated for thermodynamic performance and engineering feasibility. A preferred hybrid of these concepts was selected and a process model developed. A second law approach (so-called 'Pinch Analysis') was then applied to elucidate the best heat recovery strategies. The optimised model was used to establish key specifications in terms of bagasse and steam flows, heat transfer areas, pump capacities and parasitic power requirements for a notional 5 MWth pilot plant. The predicted performance figures of greater than 80% CGE and 12 MJ/m3 product gas Lower Heating Value compare favourably with the values targeted at the onset of the project and represent a major improvement on the performance expected from the commonly proposed gasification designs.

Revue / Journal Title

International sugar journal    ISSN  0020-8841   CODEN ISUJA3 

Source / Source

2008, vol. 110, no1309, [Note(s): 13-20 [6 p.]] (1/4 p.)

Langue / Language

Anglais
Revue : Espagnol

Editeur / Publisher

Informa Healthcare, London, ROYAUME-UNI  (1899) (Revue)

Mots-clés anglais / English Keywords

Bagasse

;

Design

;

Mots-clés français / French Keywords

Bagasse

;

Conception

;

Mots-clés espagnols / Spanish Keywords

Bagazo

;

Diseño

;

Localisation / Location

INIST-CNRS, Cote INIST : 495, 35400018346164.0020

Nº notice refdoc (ud4) : 20044247



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