Design, Simulation, Manufacturing and Testing of Forced Draft Microgasifier
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Date
2020-12
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Addis Ababa University
Abstract
This research has been carried out to develop a forced draft microgasifier cookstove from
locally available materials. To achieve the objective of the research, an Analytical method
was used for designing different parts of the gasifier. SOLID WORK 2020 was used to
model various geometries of the microgasifier stove and COMSOL Multiphysics 5.5 was
used for CFD analysis of the cookstove to analyze the thermal behavior of the stove and,
International Standards Organizations ISO 19867-1:2018 guideline was used for testing
the performance of a forced draft microgasifier stove. Finally, by using surface
temperature measured during the experiment, the contribution of each mode of heat
transfer was calculated.
The developed forced draft microgasifier cookstove has a combustion chamber diameter of
200mm and height of 260mm. In order to minimize the heat loss from the combustion
chamber to the stoves outside body the combustion chamber of the stove was covered with
clay of 20mm thickness. Also the gap between the insulation clay and the outside cylinder
of the stove was 20mm and it used for secondary air supply as well as used as additional
insulator. The air was supplied with the help of 12V, 92mm computer fan. The fan supply
air at the speed of 5m/s.
The CFD result shows the effects of pot support height on the thermal efficiency of the
stove and the study found that a lower pot support height has high thermal efficiency than
the higher ones. The result of CFD was compared and valiodated with the experimental
data. From the result obtained, the thermal efficiency of CFD, Experiment, and heat
transfer analysis was 49.72, 44.70, and 40.12% respectively. The specific fuel consumption
of the developed stove was 56g/liter.
Generally, the developed forced draft microgasifier stove provides better performance
when compared to the previous design proposed by other researchers. Thus disseminating
the developed microgasifier stove at a larger scale in developing countries like Ethiopia
will be beneficial in reducing deforestation and emission that will be brought about by
using open-fire stoves and thus, helps to obtain carbon credit.
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Keywords
Forced draft Microgasifier, Microgasifier, COMSOL, CFD, SOLIDWORK