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A furnace having a primary heat exchange unit also providing a combustion chamber, a secondary heat exchange unit connected by an upper crossover conduit to the primary heat exchange unit, and a tertiary heat exchange unit connected by a lower V-shaped crossover conduit to the secondary heat exchang

A furnace having a primary heat exchange unit also providing a combustion chamber, a secondary heat exchange unit connected by an upper crossover conduit to the primary heat exchange unit, and a tertiary heat exchange unit connected by a lower V-shaped crossover conduit to the secondary heat exchange unit. A third crossover conduit connects the V-shaped crossover conduit with the primary heat exchange unit. Vibrating means are provided between the secondary and tertiary heat exchange units to vibrate the walls thereof and dislodge clinging fly ash so that it falls into the V-shaped crossover conduit for removal by the screw conveyor. A burner assembly of a furnace includes a combustion air housing carrying a circular, stationary grate with an annular valley for carrying fuel during combustion. A central opening is connected to a fuel conveyor for introduction of fuel to the grate through the lower portion of the housing. Combustion air introduction conduits on the housing are remote from the fuel introduction passages and introduce air under pressure at the lower portion of the grate. An agitator and discharge ring is provided on the grate and is rotated on the grate by a suitable drive sprocket mechanism to agitate the fuel for more complete burning thereof and to remove burned ash. A horizontal burner plate is supported by a plurality of legs connected to the agitator and discharge ring over the grate to promote more complete combustion of the fuel.

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A solid fuel burning assembly comprising: a combustion air housing having walls defining a chamber and a generally flat top surface for support of a grate, and having a central fuel opening at a first central location connected to a central fuel port for passage of solid fuel from a location beneath

A solid fuel burning assembly comprising: a combustion air housing having walls defining a chamber and a generally flat top surface for support of a grate, and having a central fuel opening at a first central location connected to a central fuel port for passage of solid fuel from a location beneath the housing to a location above the housing; a fuel grate located on the top surface of the housing, said fuel grate having an inner annular wall disposed in surrounding relationship to said central fuel opening of the housing with a lower edge in generally sealing relationship to the housing top surface, an outer annular wall radially spaced from the inner annular wall and having a lower edge in generally sealing relationship to the housing top surface, a grate surface extending between the inner annular wall and the outer annular wall and spaced from the top surface of the housing, said grate surface configured sloping gently downward from the upper edge of the inner annular wall to a trough bottom and sloping steeply upward from the trough bottom to the upper edge of the outer annular wall to form an annular solid fuel burning trough, said outer annular wall having an upper horizontal ledge, said grate surface having a plurality of air circulation openings extended between the upper edges of the inner annular wall and the outer annular wall open to the space between the grate surface and the housing top surface; a rotatable annular agitator and discharge ring mounted coaxially on the grate having an inner edge supported on the horizontal ledge of the outer annular wall of the grate, a horizontal planar upper surface for conveying ashes to the periphery of said agitator and discharge ring for discharge of the ashes, a vertical sidewall disposed in straddling relationship to the outer annular wall of the grate, and a plurality of peripherally spaced, vertical teeth outwardly extended from the sidewall for substantially the height of the sidewall; a fuel screw conveyor assembly including a tubular screw conveyor housing assembled to the fuel entry port of the combustion air housing, a conveyor shaft located in the tubular screw conveyor housing and a conveyor flight on the conveyor shaft to deliver fuel to the fuel entry port to be moved through the fuel opening to the grate; said conveyor shaft having a portion extending through the combustion air housing beyond the fuel opening; means to rotate the agitator and discharge ring including a ring rotating sprocket assembled to the end of the conveyor shaft for rotation with the conveyor shaft, said sprocket having at least one outwardly extended sprocket tooth positioned for engagement ship to the housing top surface, a grate surface extending between the inner annular wall and the outer annular wall and spaced from the top surface of the housing, said grate surface configured sloping gently downward from the upper edge of the inner annular wall to a trough bottom and sloping steeply upward from the trough bottom to the upper edge of the outer annular wall to form an annular solid fuel burning trough, said outer annular wall having an upper horizontal ledge, said grate surface having a plurality of air circulation openings extended between the upper edges of the inner annular wall and the outer annular wall open to the space between the grate surface and the housing top surface; a rotatable annular agitator and discharge ring mounted coaxially on the grate having an inner edge supported on the horizontal ledge of the outer annular wall of the grate, a horizontal planar upper surface for conveying ashes to the periphery of said agitator and discharge ring for discharge of the ashes, a vertical sidewall disposed in straddling relationship to the outer annular wall of the grate, and a plurality of peripherally spaced, vertical teeth outwardly extended from the sidewall for substantially the height of the sidewall; a fuel screw conveyor assembly including a tubular screw conveyor housing assembled to the fuel entry port of the combustion air housing, a conveyor shaft located in the tubular screw conveyor housing and a conveyor flight on the conveyor shaft to deliver fuel to the fuel entry port to be moved through the fuel opening to the grate; said conveyor shaft having a portion extending through the combustion air housing beyond the fuel opening; means to rotate the agitator and discharge ring including a ring rotating sprocket assembled to the end of the conveyor shaft for rotation with the conveyor shaft, said sprocket having at least one outwardly extended sprocket tooth positioned for engagement with the agitator and discharge ring teeth upon rotation of the sprocket, said sprocket tooth of sufficient length to result in said engagement at a point higher than a median line between the top and bottom of said agitator and discharge ring teeth to rotate said agitator and discharge ring; means for rotation of the sprocket and conveyor shaft; said housing having at least one air supply opening in the top surface thereof communicating with said chamber and located beneath the grate surface to supply air under pressure to the grate surface through the grate openings for purposes of combustion with solid fuel introduced to the grate through the fuel opening; and means to supply combustion air under pressure to said chamber including a combustion air duct connected to the combustion air housing at a second location remote from the first central location of the fuel entry port. A solid fuel burning assembly for installation in a furnace, comprising: a combustion air housing having walls defining a chamber and a generally flat top surface for support of a grate, and having a central fuel opening at a first central location connected to a central fuel port for passage of solid fuel from a location beneath the housing to a location above the housing; a fuel grate located on the top surface of the housing, said fuel grate having an inner annular wall disposed in surrounding relationship to said central fuel opening of the housing with a lower edge in generally sealing relationship to the housing top surface, an outer annular wall radially spaced from the inner annular wall and having a lower edge in generally sealing relationship to the housing top surface, a grate surface extending between the inner annular wall and the outer annular wall and spaced from the top surface of the housing to support fuel during combustion in a combustion area located above the grate surface, said grate surface configured sloping gently downward from the upper edge of the inner annular wall to a trough bottom and sloping steeply upward from the trough bottom to the upper edge of the outer annular wall to form an annular solid fuel burning trough, said outer annular wall having an upper horizontal ledge, said grate surface having a plurality of air circulation openings extended between the upper edges of the inner annular wall and the outer annular wall open to the space between the grate surface and the housing top surface; a rotatable annular agitator and discharge ring mounted coaxially on the grate having an inner edge supported on the horizontal ledge of the outer annular wall of the grate and a horizontal planar upper surface for conveying ashes to the periphery of said agitator and discharge ring for discharge of the ashes; means to rotate the agitator and discharge ring; said housing having at least one air supply opening in the top surface thereof communicating with said chamber and located beneath the grate surface to supply air under pressure to the grate surface through the grate openings for purposes of combustion with solid fuel introduced to the grate through the fuel opening; means to supply combustion air under pressure to said chamber including a combustion air duct connected to the combustion air housing at a second location remote from the first central location of the fuel entry port; means to supply fuel to the grate for combustion; a combustion burner plate assembly including a relatively horizontal combustion burner plate member located vertically spaced above the grate surface and combustion area, said burner plate member of sufficient horizontal dimension and positioned to deflect rising products of combustion back toward the combustion area of the grate assembly; and leg means supporting the combustion burner plate member above the combustion area of the grate assembly.