[Stoves] Gasifier without chopping the fuel into small pieces

[Crispin Pemberton-Pigott]

Dear Friends

There is a paper by A. Saravanakumar, T.M. Haridasan, Thomas B. Reed which I would like to bring to your attention.

A frequent complaint about gasifiers is that the fuel ahs to be chipped or reduced to mall pieces.  This paper explores the gasification of stick wood in a rather interesting manner.  It will not be of interest to everyone, but is worth a look and has some solid theory and construction advice.

It is called Flaming pyrolysis model of the fixed bed cross draft long-stick wood gasifier.

You can see it (free) for research and discussion purposes at

https://www.academia.edu/4295996/Flaming_pyrolysis_model_of_the_fixed_bed_cross_draft_long_stick_wood_gasifier

Abstract:
The future industrial development of biomass energy depends on the application of renewable energy
technology in an efficient manner. Of all the competing technologies under biomass, gasifiers are considered
to be one of most viable applications. The use of biomass fuel, especially biomass wastes, for distributed
power production can be economically viable in many parts of the world through gasification of biomass.
Since biomass, is a clean and renewable fuel, gasification gives the opportunity to convert biomass into clean
fuel gas or synthesis gas for industrial uses. The preparation of feedstock for a gasifier requires time, energy
and labour and this has been a setback for gasifier technology development. The present work is focused on
gasification of long-stick wood as a feed material for gasifiers. This application makes reduction not only in
the cost but also on the power consumption of feed material preparation. A 50 m3/h capacity gasifier was
fabricated in the cross draft mode. The cross draft mode makes it possible to produce low tar content in
producer gas. This cross draft mode operates with 180W of blower supply for air to produce 10 kW of
thermal output. The initial bed heights of the long-stick wood and charcoal are 58 cm and 48 cm respectively.
Results were obtained for various flow conditions with air flow rates ranging from 20 to 30 m3/h. For modelling,
the flaming pyrolysis time for long-stick wood in the gasifier is calculated to be 1.6 min. The length of the flaming
pyrolysis zone and char gasification zone is found to be 34 cm and 30 cm respectively. The rate of feed was
between 9 and 10 kg/h. Continuous operation for 5 h was used for three runs to study the performance. In this
study we measured the temperature and pressure in the different zones as a function of airflow. We measured the
gas flow and efficiency of the gasifier in order to determine its commercial potential for process and power
industries.

Regards
Crispin

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