[Gasification] Small steam systems plus gasifiers for electricity

Thomas Koch tk at tke.dk
Sun Dec 1 11:47:44 CST 2013


Harrie

Do you have any reliable data from someone that is not biased on these gasifiers?

Thomas

Fra: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] På vegne af Harrie Knoef
Sendt: 1. december 2013 18:44
Til: 'Discussion of biomass pyrolysis and gasification'
Emne: Re: [Gasification] Small steam systems plus gasifiers for electricity

Thomas, two German manufacturers have installed over 100 units, small scale!
Commercially with guarantees, although I do not know which guarantees
Harrie

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Thomas Koch
Sent: zondag 1 december 2013 18:38
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Small steam systems plus gasifiers for electricity

Ken

I fully agree from a thermodynamical point of view - but it is very difficult to design a reliablt working small scale gasification system

Best regards

Thomas

Fra: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] På vegne af Ken Boak
Sendt: 1. december 2013 17:42
Til: Discussion of biomass pyrolysis and gasification
Emne: Re: [Gasification] Small steam systems plus gasifiers for electricity

Hi All,

Forget small scale steam for electric power generation.  Very low overall conversion efficiency and a full-time control problem to prevent potential steam explosions, make this a technology cul-de-sac not worth exploring.

The efficiency of a good downdraft gasifier and internal combustion engine will produce four times as much electricity as any steam engine could - for the same quantity of wood fuel.

I've recently been doing test runs on an APL 20kW Power Pallet, and saw 49.5kWh of electricity produced in 2.75 hours from a standard 200 litre (55 US gal) oil drum of woodchip fuel.

regards


Ken

On 1 December 2013 16:29, <sabbadess at aol.com<mailto:sabbadess at aol.com>> wrote:
Paul,

I actually built a prototype that did this:

http://www.youtube.com/watch?v=AIFTBITYjb0

I found that small steam at the residential scale is just a bad idea.  The first major problem is wet layup seizing all the parts together.  Then there are the thermal lags of the gasifier and boiler for a step change in electrical load.  Then there is the corrosion/explosion hazard.....It just kept getting worse even though it sounded great in theory.  I am FAR happier with my gasifier/engine combo.

Stephen Abbadessa
-----Original Message-----
From: Paul Anderson <psanders at ilstu.edu<mailto:psanders at ilstu.edu>>
To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org<mailto:gasification at lists.bioenergylists.org>>
Sent: Sun, Dec 1, 2013 11:21 am
Subject: [Gasification] Small steam systems plus gasifiers for electricity
Dear Tom, Thomas and all,

On 11/30/2013 5:44 PM, Thomas Koch wrote:

Tom

.....

I can only agree that for small systems steam systems looks as the most reliable way to produce electricity



Thomas


This "low tech" approach appeals to me (and maybe to some others) because the Up Draft gasifiers are great for making clean heat, of which much gets wasted in cases such as people making char and biochar.

I acknowledge that the small steam systems for electricity do not require gasification technologies, and therefore this topic should soon be off of the Gasification Listserv.   But for the moment, who are the readers who have interest in taking this discussion further?

Paul


Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD

Email:  psanders at ilstu.edu<mailto:psanders at ilstu.edu>

Skype: paultlud      Phone: +1-309-452-7072<tel:%2B1-309-452-7072>

Website:  www.drtlud.com<http://www.drtlud.com>

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