Wood fuelled heating stove

Abstract

A wood fuelled heating stove including: a stove portion having a stove chamber therein and an fine mesh charcoal basket dividing the stove chamber into upper and lower chambers; a reduction portion having a primary combustion chamber therein and at least partly within the upper chamber of the stove chamber and having a primary grating vertically separating the primary combustion chamber from the upper chamber; an air jacket surrounding at least some of the primary combustion chamber and having a plurality of ports providing fluid communication between the primary combustion chamber and the air jacket and a primary grating providing limited flow of mobile solids and fluid between the primary combustion chamber and the stove chamber; an air passage providing fluid communication from the outside of the stove chamber to the air jacket and to the inside of the stove chamber; and a flue passage providing fluid communication from the lower chamber of the stove chamber to a flue outlet at a level above the primary combustion chamber and upper level of the stove chamber.

1 . A wood fuelled heating stove including:
 a stove chamber having a floor, a side wall extending upwardly from the periphery of the floor and a top wall extending across the top of the side wall;   a primary combustion chamber at least a part of which extends at least part way into the stove chamber through an opening penetrating the top wall, the primary combustion chamber having a base wall interposed between the floor and the top wall of the stove chamber and having a primary grating provided comprising at least a part of the base wall, a curtain wall extending upwardly from the base wall through the opening in the top wall and having a plurality of ports penetrating the curtain wall and a closure wall extending across the top of the curtain wall to enclose the primary combustion chamber;   an air jacket wall circumscribing at least part of the curtain wall at least partly below the opening to provide an air jacket circumscribing the primary combustion chamber but separated therefrom by the curtain wall, the curtain wall having a plurality of ports distributed about and penetrating therethrough to provide fluid communication between the air jacket and the primary combustion chamber, the air jacket wall and/or the curtain wall substantially sealing the opening through the top wall and separating the air jacket from the stove chamber;   an air inlet opening through the floor or the side wall at or near the floor and a stove chamber air inlet into the stove chamber through or near to the top wall;   a primary air duct, a secondary air duct and a tertiary air duct the primary air duct extending along the floor of the stove chamber and providing fluid communication from the air inlet to the secondary air duct, the secondary air duct extending upwardly from the primary air duct and the tertiary air duct providing fluid communication between the secondary air duct and the air jacket and the stove chamber air inlet;   a charcoal grating partition interposed between the floor of the stove chamber and the base wall of the primary combustion chamber; and   a flue passage extending from a flue opening to the stove chamber lower than the grating wall and upwardly to a flue outlet higher than the top and closure walls.   
     
     
         2 . A wood fuelled heating stove including:
 a stove portion having a stove chamber therein and an fine mesh charcoal basket dividing the stove chamber into upper and lower chambers;   a reduction portion having a primary combustion chamber therein and at least partly within the upper chamber of the stove chamber and having a primary grating vertically separating the primary combustion chamber from the upper chamber;   an air jacket surrounding at least some of the primary combustion chamber and having a plurality of ports providing fluid communication between the primary combustion chamber and the air jacket and a primary grating providing limited flow of mobile solids and fluid between the primary combustion chamber and the stove chamber;   an air passage providing fluid communication from the outside of the stove chamber to the air jacket and to the inside of the stove chamber; and   a flue passage providing fluid communication from the lower chamber of the stove chamber to a flue outlet at a level above the primary combustion chamber and upper level of the stove chamber.   
     
     
         3 . The wood fuelled heating stove according to  claim 2 , wherein a portion of the grating wall comprises a grating through which ash or such like may fall to rest upon the floor of the stove chamber. 
     
     
         4 . The wood fuelled heating stove according to  claim 1 , wherein the side wall includes four side wall portions, each substantially planar which, together with the floor and top wall, provide a substantially rectangular prism form for the outside walls of the stove chamber, one of the side wall portions having a door opening through and a door being moveable between an open attitude permitting the access to the stove chamber and a closed attitude substantially sealing the stove chamber against air flow through the door opening as well as sealing the upper chamber from the lower chamber. 
     
     
         5 . The wood fuelled heating stove according to  claim 4 , wherein the air jacket surrounds the lower portion of the primary combustion chamber in rectangular prism form, part of the air chamber wall being provided as an extension of the base wall or extending outwardly from the chamber wall. 
     
     
         6 . The wood fuelled heating stove according to  claim 4 , wherein the air jacket wall extends upwardly from its attachment to the base wall or curtain wall to the inside edges of the opening through the top wall of the stove chamber. 
     
     
         7 . The wood fuelled heating stove according to  claim 4 , wherein the air jacket wall ends short of the top wall and rejoins the curtain wall. 
     
     
         8 . The wood fuelled heating stove according to  claim 1 , wherein the air inlet to the primary air duct is provided substantially centrally through the front wall of the stove below the door such that the primary air duct extends horizontally along the floor and front of the stove chamber to the secondary air duct, which comprises two rising ducts which run along each side of the front wall from the ends of the primary air duct. 
     
     
         9 . The wood fuelled heating stove according to  claim 8 , wherein the primary air duct has a damper interposed between the air inlet and the secondary air duct for damping or restricting airflow through the primary air duct. 
     
     
         10 . The wood fuelled heating stove according to  claim 1 , wherein the plurality of ports are arranged to provide limited air flow to the primary combustion chamber, but the majority of the air pressure drop thereto. 
     
     
         11 . The wood fuelled heating stove according to  claim 1  which, in use, provides a reverse flow, progressive oxidation wood fuel heating stove encompassing an improved combustion process. 
     
     
         12 . The wood fuelled heating stove according to  claim 11 , wherein oxidation of wood fuel in the stove is progressive, the wood moving by gravity to locations of increasing oxidation with a gas and flame flow which is the reverse of that which may be regarded as “normal”. 
     
     
         13 . The wood fuelled heating stove according to  claim 2 , wherein the plurality of ports are arranged to provide limited air flow to the primary combustion chamber, but the majority of the air pressure drop thereto. 
     
     
         14 . The wood fuelled heating stove according to  claim 2  which, in use, provides a reverse flow, progressive oxidation wood fuel heating stove encompassing an improved combustion process.