carbon-negative.us
TERRA: Carbon Negative - Another challenge is to fashion a firebox that generates a spiral vortex flow of air, gas and flames. First, this increases the mixing of air and gas for more thorough combustion with a rapid, hot, smokeless burn. But also, a longer flame path holds more heat in the kiln to boost temperatures and improve thermal efficiency. A circular flame path around the firebox and retort is better than bottom-to-top vertical combustion outflow.
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