Jon, Wood Gassers burn very diferent than conventional wood boilers. (1) they are totally sealed without combustion air). All air is pumped in via controlled fan. (2) all combustion air is pumped into the wood holding chamber from the top and forced DOWN through small orifices, into a secondary burn chamber. These orifices similate a blowtourch which burns off the "smoke at 1200-2000F. {much the same as blowing on coals to start a fire.} This secondary gasification chamber literally burns all the heat energy that would normally be released back into the air as smoke in a conventional boiler. Smoke can amount to 50% of the heat , BTUs/LB in a peice of wood, that a conventional wood burner never converts to heat. Gassers don't recover all the BTUs , but emissions are very low, no visible smoke, and while in the "idle mode" (temp above low limit) there is no oxogen present- thus no smoldering wood/no smoke, as air flow is down in the unit and any lingering smoke is trapped in the wood chamber above the gasser chamber and flues. when core temp drops below set paramiters, generally a Delta T of 10F from a set point of 180F high side, the combustion fan will turn on or off. It is also very important to maintain a core temp of +140F, because below that condensation can occure and deterioration of the water jacket occures. Electronic sensors controlling circ. pumps or a compound manifold with mixer valve can control the low jacket temp problem. Low jacket temp also will affect when gassifacation ocures, depending on the quality of the wood. Jon, I might have confused you a bit, but think of this system like the injection/combustion systen in a 930 Case, Inject fuel into Precombustion chamber, blow it out into the cylinder and off you go. Loren The acg
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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