[Gasification] reducing temp. of gasification

Tue Oct 11 13:38:43 CDT 2011

Jai.
One system worth developing would be to conduct the (gaseous products) of pyrolysis, "burning without oxygen" passing this "smoke " through a high temperature reactor such as a red hot "heat exchanger" heated by the exhaust manifold of a fully loaded internal combustion engine,then subjecting this heated stream of tar bearing smoke through a high frequency electro magnetic field. thus forming an ionized plasma with the use of domestic micro wave magnetron/s
The posibility of  water shift reaction for enriching the gas with hydrogen in this area is high, also any condensate would resemble ethanol rather than tar. The micro wave enclosure must be made with refractory and screen with metal ,the gas  inlet and outlet screened with the same material as used in the door of the microwave oven.
Because there is such  enormous waste heat available from an ICE. the pre heating of distilled water into super heated steam is easily obtained, which will cancel endothermic reactions of water shift when added to your gas stream. 

GF

-----Original Message-----
From: Kevin <kchisholm at ca.inter.net>
To: jai balwanshi <jai764u at yahoo.com>; Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org>
Sent: Tue, Oct 11, 2011 4:25 am
Subject: Re: [Gasification] reducing temp. of gasification

Dear Jai

----- Original Message ----- 
From: jai balwanshi 
To: Discussion of biomass pyrolysis and gasification 
Sent: Tuesday, October 11, 2011 2:05 AM
Subject: Re: [Gasification] reducing temp. of gasification

we have many method to reduce tar but i want which is most simplest.

# Your very simple, but very important question was: "What is the simplest way to reduce tar?" I feel that the short answer is "Burn it." 

# Support for this simplistic answer is based on the fact most gasifiers producing low tar woodgas seem to operate with a high reaction zone temperature. The trick is to burn the tars evolved by pyrolysis, while burning the least amount of char. This is accomplished in the Imbert Style of gasifier by optimal placement and sizing of the air jets in relation to the hearth size and location for the particular kind of fuel employed..

# It would be very helpful to the List if you would be kind enough to outline some of the many methods you have to reduce tars.

# Thanks!

Kevin

Jai Balwanshi
Assistant Professor
Mechanical Engineering Department
VITS - Indore
Contact No. 9713281992

From: Pete & Sheri <spaco at baldwin-telecom.net>
To: 'Discussion of biomass pyrolysis and gasification' <gasification at lists.bioenergylists.org>
Sent: Tuesday, 11 October 2011 8:39 AM
Subject: Re: [Gasification] reducing temp. of gasification

Hello, Greg.
  I know that the correct solution to tar is to keep the reactor temp up,
but, just in case,
how do YOU test for tar? 

Pete Stanaitis
-------------- 

-----Original Message-----
From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Greg
Manning
Sent: Monday, October 10, 2011 3:13 PM
To: jai balwanshi; Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] reducing temp. of gasification

Greetings, Jai, and list members.

Reducing tars in gas output, is really quite simple, design a gasifier
that works correctly for the desired feedstock is the main method,
however, you can also design a poorly built gasifier, and use many
cleaning filters after the gasifier, in the gas output pipes.

But really, one must understand what "tars" are, and at what internal
temperature the gasifier runs at, once this is known, then the design
can be re-designed to achive the correct temperature to reduce the
tars BEFORE they enter the gas output area.

In other words, generally 2 or more gasifiers must be built (or the
original one modified) to the point of acceptable level of tars within
the gas output.

Greg Manning
Canadian Gasifier Ltd.

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