[Stoves] _Biomass Charcoal Combustion Heater_PATENTS

Wed Jan 22 17:30:38 CST 2020

Dear Dhan

The excess air and therefor the CO level can be managed by changing the thickness of the fuel deposited on perforated the chamber floor.  Apparently they didn’t do that.

It did not burn very well.  The carbon combustion efficiency was only 88%, against >99% for a decent $200 HELE crossdraft coal stove which can also operate on some powder (30%?).  The reason is pretty obvious: the O2 level never got anywhere near low enough to burn the carbon properly.  They also were interested in burning the fuel particles quickly which is not a requirement for good combustion.

If they had deepened the fuel bed they could have dropped the O2 from 15% to 7-8% and the CO level might have improved greatly.  Another problem is the area into which the hot gases emerged after passing through the grate was too large to maintain a good combustion temperature.

From the conclusion: " Since the effective burnout time of particles increases with the number of layers, it is desirable to keep the bed thin for lower burnout times of charcoal particles."

The burnout time is not the problem, the high excess air level (250%) is.  It never had a chance.

In case people cannot access the paper, here is the drawing:

[cid:image003.jpg at 01D5D14F.AC79C260]

Regards

Crispin

-----Original Message-----
From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of DHAN HURLEY
Sent: Wednesday, January 22, 2020 15:57
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] _Biomass Charcoal Combustion Heater_PATENTS

Hi,

How many of you have heard of this ( SEE WHAT I MEAN ABOUT PATENTS.... LOOK AT THE DATE 9 :

Development of Biomass Charcoal Combustion Heater for Household Utilization.

    Masayuki Horio,  Amit Suri*, Junji Asahara, Shinichi Sagawa, Chizuko Aida.

Cite this: Ind. Eng. Chem. Res. 2009, 48, 1, 361-372 Publication Date:August 27, 2008

https://doi.org/10.1021/ie8006243

Copyright © 2008 American Chemical Society

Abstract

In the present work a prototype powdered biomass charcoal fired heater with a heat output of 6 kW is designed and developed so that a new powdered charcoal market can be initiated to enhance greenhouse gas (GHG) reduction through massive biomass utilization. The combustion heater was designed based on the concept of charcoal combustion in a thin bed cross-flow (TBCF) mode, where a very thin uniform bed of charcoal is fixed by air flow on the wall of a cylindrical chamber with an air-penetrable wall. The distinct advantage of using such a thin bed cross-flow is low fuel inventory and good air−fuel contact, resulting in fast startup/shutdown and low CO emissions in the exhaust gases.

Dhan

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