초록 ▼

A furnace system for automatic, continuous and efficient burning of fragmented wood-type fuel incorporates a wood-type fuel combustion chamber, a fragmented wood-type fuel feeder or conveyor for trickle feeding fuel into the chamber at selected uniform rates, a heat exchanger or heat exchange plenum

A furnace system for automatic, continuous and efficient burning of fragmented wood-type fuel incorporates a wood-type fuel combustion chamber, a fragmented wood-type fuel feeder or conveyor for trickle feeding fuel into the chamber at selected uniform rates, a heat exchanger or heat exchange plenum, igniter for igniting the fuel fragments supported in the combustion chamber, a flame sensor mounted relative to the combustion chamber for sensing the presence of flames from fuel supported in the combustion chamber, one or more blowers providing forced air or forced draft, and a control circuit for controlling and sequencing operation of the elements for the furnace system and for operatively coupling the flame sensor and igniter for switching off the igniter upon sensing of flames from the wood-type fuel. An electric igniter is disclosed having a heating element for achieving flash point temperatures of fuel to be ignited, a shroud enclosing the heating element and communicating with the combustion chamber adjacent the fuel at a downwardly directed angle and a blower at the other end of the shroud for delivering air over the heating element. Two flame sensors are provided, for sensing the presence of flames from above and from the side.

대표청구항 ▼

A furnace system comprising: wood-type fuel combustion chamber means comprising an enclosure of refractory material forming a primary combustion section and an afterburner section affording flame passageway means within said enclosure, a combustion chamber surface mounted in the primary combustion s

A furnace system comprising: wood-type fuel combustion chamber means comprising an enclosure of refractory material forming a primary combustion section and an afterburner section affording flame passageway means within said enclosure, a combustion chamber surface mounted in the primary combustion section for receiving fragments of wood-type fuel and for supporting said fuel during combustion, said enclosure formed with an opening above the combustion surface for gravity delivery of fragmented wood-type fuels onto said surface, said enclosure formed with combustion air inlet means in said primary combustion section and draft outlet means in the afterburner section, electric igniter means, said electric igniter means comprising heating element means operatively formed for achieving flash point temperatures of the fuel to be ignited, shroud means enclosing said heating element means and operatively communicating at one end with the combustion chamber means above the combustion surface and adjacent wood-type fuel supported on said surface, said shroud means open at said end to expose wood-type fuel supported on the surface to radiant heat from the heating from the heating element means for ignition by radiant heat without the heating element means contacting the wood-type fuels, said shroud means mounted at an angle above the horizontal and directed downwardly toward the combustion surface, blower means coupled to the other end of said shroud means for delivering air over the heating element means thereby cooling the heating element means and delivering heated combustion air to the wood-type fuel supported on said surface, flame sensor means positioned relative to the combustion chamber means for sensing the presence of flames from wood-type fuels supported in the combustion chamber means, said flame sensor means comprising a first flame sensor positioned relative to the wood-type fuel combustion chamber means over the combustion surface looking downwardly for sensing the presence of flames from above said surface, and a second flame sensor positioned relative to the wood-type fuel combustion chamber means at the side and looking across the flame path for sensing the presence of flames passing from the primary combustion section to the afterburner section of the combustion chamber, said first and second sensors coupled in parallel in the control circuit means for concurrent control of the electric igniter means heating element means, and control circuit means operatively coupling said heating element means and flame sensor means for switching off said heating element means upon sensing of flames from the wood-type fuel, said control circuit means comprising timing means for turning off the heating element means after a specified period of time if flames are not sensed by the flame sensor means.