Both the fuel and the gas flow downhill in[url=www.biogasifier.com/knowledge/downdraft-biomass-gasifier-made-in-china.html]downdraft gasifiers[/url]. Fuel travels downward and gas moves upward in updraft gasifiers. Co-current gasifiers move the gas and fuel in the same direction, typically downward (downdraft gasifiers), but it is possible for the gas to move upward as well.

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