This study presents a numerical modeling of a downdraft gasifier. Wood (biomass) was considered as a feedstock for gasification as it is a cheap biomass and locally available. The numerical study was carried out to predict the flow behavior, the performance of the downdraft gasifier and the syngas composition precisely. The current downdraft gasifier was modeled using standard kε turbulence model, DPM for discrete phase, nonpremixed combustion model for combustion and DO radiation model for radiation modeling. The flow behavior and the temperature distribution of the downdraft wood gasifier were addressed which helped to understand the internal combustion phenomenon. Results also showed that the predicted syngas compositions were as follows: Nitrogen-54.12%, Hydrogen-8.10%, Carbon Monoxide-16.04%, Carbon Dioxide-13.01%, Methane-2.35%, Water vapor-05.10% by volume. In addition gasifier, thermal efficiency was found about 72%. This gasification process produces syngas which is directly usable as an alternative fuel to various IC engines.

1.
Ramírez
Rubio
, S.,
F.E.
Sierra
, and
C.A.
Guerrero
,
Gasification from Waste Organic Materials
.
Ingeniería E Investigación
,
2011
.
31
(
3
): P.
17
25
.
2.
Vaezi
,
M.
,
M.
Passandideh-Fard
, and
M.
Moghiman
.
On a Numerical Model for Gasification of Biomass Materials
. In
1st WSEAS Int. Conf. On Computational Chemistry
.
2007
.
Citeseer
.
3.
Smoot
,
L.D.
,
Modeling of Coal-Combustion Processes
.
Progress in Energy and Combustion Science
,
1984
.
10
(
2
):P.
229
267
.
4.
Eaton
,
A.
, et al,
Components, Formulations, Solutions, Evaluation, and application of Comprehensive Combustion Models
.
Progress in Energy and Combustion Science
,
1999
.
25
(
4
): P.
387
436
.
5.
Luan
,
Y.-T.
,
Y.-P.
Chyou
, and
T.
Wang
,
Numerical Analysis of Gasification Performance Via Finite-Rate Model in a Cross-Type Two-Stage Gasifier
.
International Journal of Heat and Mass Transfer
,
2013
.
57
(
2
): P.
558
566
.
6.
Knoef
,
H.
, Inventory of Biomass Gasifier Manufacturers and Installations,
Final Report to European Commission
. Contract DIS/1734/98-NL,
Biomass Technology Group BV, University of Twente
,
Enschede
,
2000
.
7.
Simone
,
M.
,
C.
Nicolella
, and
L.
Tognotti
,
Numerical and Experimental Investigation of Downdraft Gasification of Woody Residues
.
Bioresource Technology
,
2013
.
133
: P.
92
101
.
8.
Zainal
,
Z.
, et al,
Prediction of Performance of a Downdraft Gasifier Using Equilibrium Modeling for Different Biomass Materials
.
Energy Conversion and Management
,
2001
.
42
(
12
): P.
1499
1515
.
9.
Lapuerta
,
M.
, et al,
Thermochemical Behaviour of Producer Gas from Gasification of Lignocellulosic Biomass in SI Engines
,
2001
, SAE Technical Paper.
10.
Hasan
,
M.M.
,
N.
Mustafi
, and
M.A.
Hashem
.
Prospects of Biomass Gasification as an Energy Source in Bangladesh
. In
International Conference on Mechanical Engineering
,
Bangladesh
.
2009
.
11.
Bocci
,
E.
, et al,
State of Art of Small Scale Biomass Gasification Power Systems: A Review of the Different Typologies
.
Energy Procedia
,
2014
.
45
: P.
247
256
.
12.
Erlich
,
C.
and
T.H.
Fransson
,
Downdraft Gasification of Pellets Made of Wood, Palm-Oil Residues Respective Bagasse:Experimental Study
.
Applied Energy
,
2011
.
88
(
3
): P.
899
908
.
13.
Wood
,
B.J.
, et al,
Wood Gas as Engine Fuel
,
1986
,
Food and Agriculture Organization of the United Nations
.
This content is only available via PDF.
You do not currently have access to this content.