Clean burning solid fuel stove and method
OwnerRichard D. Smith, Samuel J. Van Grouwinventors
Life of this patent
Estimating the term…
Abstract
A stove and method for burning solid fuels having an insulated primary combustion chamber, uniform distribution of preheated primary air through upward facing holes in a grate, downward flow of combustion gas through the grate, retention of hot coals in the grate structure, preheated secondary air, individually controlled primary and secondary air flows, insulated vortex combustion chambers for secondary combustion, longitudinally finned tubes as a first stage heat exchanger, plate-fin assembly as a second stage heat exchanger, an induced draft fan to draw the air and combustion gases through the combustion chambers as well as the heat exchangers, and a forced air fan to blow cool room air through the two stage heat exchanger.
Claims20
A solid fuel burning stove comprising:
- an insulated primary combustion chamber for containing the solid fuel to be converted to combustion vapor;
- a grate for supplying and for controlling the supply of atmospheric primary air and for preheating, for controlling the supply of and for delivering atmospheric secondary air to said primary combustion chamber;
- an insulated secondary combustion chamber, located downstream from said primary combustion chamber, for receiving the preheated atmospheric secondary air and the combustion vapor from said primary combustion chamber, said secondary combustion chamber having at least one vortex combustor for swirling the combustion vapor with the atmospheric secondary air, for burning substantially all of the combustion vapor, for elevating the velocity of the mixture of combustion gas and secondary air, and for elevating the temperature of the mixture of combustion gas and secondary air to the highest temperature within said stove;
- means for conveying the high temperature combustion gas from said secondary combustion chamber to exhaust from said stove with substantially no pollutants and at a substantially reduced temperature including
- a heat exchanger located downstream from said secondary combustion chamber for receiving the high temperature combustion gas and for transferring the heat from the combustion gas to the room air;
- and
- induced draft fan means for moving the combustion gas through said combustion chambers and said heat exchanger, and
- a convective air fan to move the room air to be heated through said heat exchanger.
The method of burning solid fuel comprising the steps of
- drawing primary air upwardly in a primary combustion chamber during combustion of the solid fuel therein,
- drawing combustion vapor downwardly from said primary combustion chamber into a vortex secondary combustion chamber,
- mixing secondary air with said combustion vapor prior to introduction of the gases into said vortex secondary combustion chamber,
- swirling said combustion vapor and said secondary air in said vortex chamber at a high speed to burn substantially all of said combustion vapor and for elevating the mixed secondary air and combustion vapor to its highest temperature within said stove,
- exchanging the heat of said combustion gases with room air within a heat exchanger, and
- said steps of drawing said primary air, said secondary air and said combustion gases through said combustion chambers and heat exchanger is accomplished with exhaust fan means.
Dependencies are inferred from the claim text.