Dear Lanny
It requires either limiting the primary air supply that drives the evolution of gases while permitting the secondary to reach the gases, or removing some of the fuel. The use of staged combustion is going to be the most popular with inventers and the removal of fuel is the most popular with current users of open fires. Where the fuel is dependent on a 'feed rate' the feed rate can be changed. That is used in wood pellet furnaces, for example, and LPG cookers - after all, turning the knob changes the fuel feed rate. Regards Crispin +++++ Turning down a wood fire How do you limit the reaction without starving the reaction of enough oxygen for clean combustion? How do you control a wood fire? Lanny Henson
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