[Gasification] CO2 recycling

Thu Oct 4 09:53:20 EDT 2007

Dear friend . The question is if CO2 is cold is inert ,but if it have 700 C it is oxidant and take up carbon then CO2 plus C becames in 2 CO. Heat is necessary to take from waste sources to save costs. In car case you can generate higher temperatures using battery 24 V DC  source lighting arc electrodes using graphite rods with Lincoln flux for welding inmersed. Our proposal in case of use plasma microwave torch is to split wood chips in CO plus  H to form synthesis gas for methanol production. technology is good to better processes but we want to choice that profitable in cost realtionship.
  Regards , Benjamin

gfwhell at aol.com escribió:

Ben .
Your observations regarding CO2 as "recyclable" is one of the aspects  of flammable gas production which seems to have been missed by most.
The addition of steam in the proximity of hot carbon is about all that is needed to produce CO.+H2
Maintaining the  temperature is crucial for this reaction which is,in itself,  endothermic. I have been researching the possibility of providing the additional heat necessary to maintain this reaction which will allow the hot exhaust gas from an engine to be returned for recycling. I believe it will be possible to eliminate much of the nitrogen entirely from the reaction zone.. For some years now,  gases have been refined and processed with the use of microwave plasma. the temperature of which can reach 10000K,.
At high temperatures. compounds disintegrate and readily turn into base materials,  in the presence of carbon, water will crack , giving oxygen and hydrogen for the formation of gases containing hydro carbons.
Generating a plasma to obtain this reaction is fairly simple as demonstrated by various patents and centers of learning, plasma purified gas is a well established technology.
This process could be designed into  the construction of a gas producing plant. The input of energy would not exceed that of a car alternator's output. say  1200w. in order  to run a 10kw generator, using biomass as a fuel. check into ball lightning in a microwave.

GF

-----Original Message-----
From: Benjamin Domingo Bof 
To: Ferruccio Pittaluga 
; Discussion of biomass pyrolysis and gasification 
Sent: Sat, 8 Sep 2007 1:57 pm
Subject: Re: [Gasification] CO2 recycling

Dear Ferruccio, recycling exhaust gases efficiency is poor because is present an 
half part of Nitrogen. Is very good to reuse CO2; britons was discover algae for 
transform this product in biomass. report says an device loaded over the car 
recovering all dioxide.
Regards; Beniamino Bof

Ferruccio Pittaluga escribió:
Dear all,
I have just read the following statements on a Jan 1942 paper by Torsten Kaelle 
(paper available at: http://www.hotel.ymex.net/~s-20222/gengas/kg_eng.html#fig6) 
referred to a coal gasifier for mobile applications:

"One could say, that the carbon-dioxide (CO 2 ) is the `fuel' from which 
producer gas, that is carbon monoxide (CO) is made. It could thus be considered 
a pure waste to generate carbon dioxide from charcoal, when the former ---as the 
final product of combustion in the motor---is available in sufficient quantities 
from the exhaust gases! It also goes without saying, that the larger portion of 
the CO 2 in the exhaust that can be reused for producing carbon monoxide, the 
more economically the gasifier operates, and the longer one can drive on the 
same amount of charcoal, and the cheaper the driving is. I therefore decided to 
mix a certain portion of the exhaust gases from the motor into the primary air. 
The combustion gases, passing from the combustion zone to the reduction zone 
will thereby contain more carbon dioxide than what corresponds to the consumed 
charcoal. The excess of heat will be consumed for reducing the excess CO 2 . If 
the portion of exhaust gases is small, the
reaction will become complete and the producer gas becomes entirely free from 
CO 2 . In practice it is however better to let the producer gas contain one or 
two percent CO 2 . The heat value of the gas will not be significantly lowered 
by it, but it guarantees that all the heat is made useful. Further experiments 
showed, that the best effect was gained by an adding of about 17% CO 2 to the 
gasifier, which, under the condition that all of that was turned into CO, 
results in a significant saving of charcoal."

Has anyone got any experience on CO2 recycling within downdraft biomass 
gasifiers?
Many thanks.
Ferruccio Pittaluga

DIMSET/SCL - Savona Combustion Lab 
pittalug at unige.it 
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