Re: GAS-L: Uncracked Product Gas cooling level successfully operated

[Jerod Smeenk <jsmeenk@iastate.edu>]

Andries,

I have operated several gasifiers (lab and field) meeting all your conditions accept wood as the fuel.  In these systems, the product gas has cooled (by natural convection on the gas ducts) to 400 C without any noticeable condensation of tars.  Fuels tested include corn, switchgrass, and corn cobs.

I would be interested to hear other's experiences as well.

Jerod


At 05:03 PM 8/30/2001 +0200, Weststeijn A wrote:

Dear List members,

Much has been published on thermal and catalytic tar cracking of  product
gas.
However, actual operating experience on uncracked but cooled product gas
appears harder to come by (perhaps understandable).
Still, from a design point of view this would be quite relevant information
to be used for different engineering purposes, including reduction of gas
volume transportation.

Therefore, I am interested to learn to what actual temperature level
"uncracked" tar (and particulate matter) laden product gas from wood
gasification has been successfully cooled down to and operated continuously.

To focus the question:
-gasifiers to be air-blown
-gasifiers not to include downdraft (likely too low in tar for my question)
-biomass fuel preferably to be wood (but other biomasses might still be of
interest for comparison reasons)
-purpose and method of cooling assumed less relevant than actual cooling
temperature reached successfully
-continuous conditions to mean that the gas cooling is no constraint as to
the operation of the gasifier train

Any examples of both lab and field experience -or references thereto- are
much appreciated.
Also examples from a more distant past, if so available.

Best regards,
Andries Weststeijn

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