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[fraist]

Hi everyone, I'm sort of new in this topic but I'm eager to learn,so please bear with me while I try out a theory on how to reduce tar on an updraft gasifier.
As we all know,theoretically, updraft gasifier produces more MW than a downdraft, but it produced more tar, which makes it not friendly/qualified for engine use.
Straigth to the point, in an updraft gasification, we know that the outlet is located on the upper part of the gasifier (above the drying zone). So is it possible to move the outlet from its original location (above the drying zone), into the reduction zone. the reason why I thougth of this in the first place is because if we move the outlet into the reduction zone, the syngas will go through the reduction zone thus promoting "tar cracking",making the primary tars into secondary tars and also making more CO,CH4 content which makes its LHV increase.And I'm using rubber wood the size of 3 cm x 3 cm x 5 cm as biomass fuel

Is this theory possible or is there something wrong?

Comments and critics are welcome
cheers

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[madflower]

The problem you will have with your design is that the combustion zone, will be the -easiest- route for the air to escape, which is above the ash pit, but to the far right directly above the gas outlet.  You should google for "cross-draft gasifiers".