Stoker actuated coal burning apparatus

Claim 2

Stoker actuated coal burning apparatus comprising: a feed box having a generally horizontal intake port for connection to a fuel-feeding stoker mechanism and a generally vertical discharge port for transmission of coal to a burning zone; an annular burner body mounted on the feed box and having a central annular vertically directed delivery ring in coaxial communication with the discharge port, and an annular burner grid connected to the upper end of the delivery ring and sloping outward and downward; and an annular ash ring having an inner marginal portion overlying the outer marginal portion of the burner grid and an outer portion extending outward beyond the grid, with the upper surface sloping outward and upward to define with the grid surface an annular recess for retaining burning coal; the inner marginal portion of the ash ring resting directly on the outer marginal portion of the grid to prevent discharge of ashes at their juncture, and the outer marginal portion of the grid serving as a bearing for rotational support of the ring; the burner body being restrained against rotation; and the ash ring being rotatable about the vertical axis of the burner body.

Claim 3

Apparatus as claimed in claim 1; in which the inner marginal edge of the ash ring is formed as a substantially vertical wall to intercept and delay the outward movement of the fuel on the grid.

Claim 4

Apparatus as claimed in claim 2; in which a plurality of peripherally spaced upstanding ribs are provided on the upper surface of the ash ring and extend between the inner and outer margins and down the inner marginal wall to intercept clinkers and break them down.

Claim 5

Apparatus as claimed in claim 3; in which the ribs extend substantially radially on the upper surface of the ring.

Claim 6

Apparatus as claimed in claim 3; in which at least one breaker tooth is provided on the upper surface of the burner grid with its radially outer edge adjacent to the path of movement of the ribs on the ash ring to coact with them in breaking down clinkers.

Claim 7

Apparatus as claimed in claim 5; in which the breaker tooth has a substantially vertical leading edge upstanding from the grid surface to confront the oncoming ribs on the ash ring; the upper surface of the tooth sloping downward and rearward to the surface of the ring.

Claim 8

Apparatus as claimed in claim 1; in which the grid is formed with a plurality of peripherally spaced radially extending apertures through its thickness for upward passage of combustion air; and the ash ring is imperforate to carry all ashes to its outer margin for discharge.

Claim 9

Apparatus as claimed in claim 1; in which the outer marginal portion of the grid which serves as a bearing for the ring lies in a horizontal plane; and its juncture with the sloping portion of the grid defines a guide to maintain the ring in coaxial relation with the grid.

Claim 10

Apparatus as claimed in claim 8; in which a fuel supply tube is connected to the intake port of the feed box and a conveyor shaft with a conveyor screw mounted thereon extends into the feed box; the shaft extends through the feed box to its exterior; a drive sprocket is mounted on the free end of the shaft; and the outer marginal portion of the ash ring is provided with a plurality of peripherally spaced depending teeth engageable by the sprocket to cause rotation of the ash ring.

Claim 11

Apparatus as claimed in claim 1; in which the slopes of the burner grid and the ash ring surfaces are each of the order of twenty degrees.

Claim 12

Stoker actuated coal burning apparatus comprising: a feed box having a generally horizontal intake port for connection to a fuel-feeding stoker mechanism, a vertical discharge port for transmission of coal to a burning zone, and a curved fuel passage between the ports; the upper end of the feed box comprising a horizontal supporting plate surrounding the exit of the discharge port; an annular upstanding guide ridge on the plate having at least one interruption in its continuity; an annular burner body mounted on the supporting plate and having a central annular vertically directed delivery ring in coaxial communication with the discharge port, an annular burner grid connected to the upper end of the delivery ring, and an annular stabilizing flange depending from the outer perimeter of the burner grid resting on the supporting plate and in substantially positioning contact with the guide ridge; the stabilizing flange having an abutment engaging in the interruption in the guide ridge to prevent rotation of the burner body with respect to the feed box; and an annular ash ring having an inner marginal portion overlying the outer marginal portion of the burner grid and an outer portion extending outward beyond the grid; the ash ring being rotatable about the vertical axis of the burner body.

Claim 13

Stoker actuated coal burning apparatus comprising: a feed box having a generally horizontal intake port for connection to a fuel-feeding stoker mechanism, a vertical discharge port for transmission of coal to a burning zone, and a curved fuel passage between the ports; the upper end of the feed box comprising a horizontal supporting plate surrounding the exit of the discharge port; an annular upstanding guide ridge on the plate having at least one interruption in its continuity; an annular burner body mounted on the supporting plate and having a central annular vertically directed delivery ring in coaxial communication with the discharge port, an annular burner grid connected to the upper end of the delivery ring, and an annular stabilizing flange depending from the outer perimeter of the burner grid resting on the supporting plate and in substantially positioning contact with the guide ridge; the stabilizing flange having an abutment engaging in the interruption in the guide ridge to prevent rotation of the burner body with respect to the feed box; and an annular ash ring having an inner marginal portion overlying the outer marginal portion of the burner grid and an outer portion extending outward beyond the grid; the ash ring being rotatable about the vertical axis of the burner body.

Claim 14

Apparatus as claimed in claim 11; in which the upper surface of the burner grid slopes outward and downward and the upper surface of the ash ring slopes outward and upward to define between them an annular recess for retaining burning coal.

Claim 15

Apparatus as claimed in claim 12; in which a plurality of peripherally spaced upstanding ribs are provided on the upper surface of the ash ring and extend between the inner and outer margins and down the inner marginal edge to intercept clinkers and break them down.

Claim 16

Apparatus as claimed in claim 13; in which at least one breaker tooth is provided on the upper surface of the burner grid with its radially outer edge adjacent to the path of movement of the ribs on the ash ring to coact with them in breaking down clinkers.

Claim 17

Apparatus as claimed in claim 11; in which the inner marginal portion of the ash ring rests directly on the outer marginal portion of the grid to prevent discharge of ashes at their juncture, and the outer marginal portion of the grid lies in a horizontal plane to serve as a bearing for rotational support of the ring; and its juncture with the sloping portion of the grid defines a guide to maintain the ring in coaxial relation with the grid.

Claim 18

Apparatus as claimed in claim 11; in which a fuel supply tube is connected to the intake port of the feed box and a conveyor shaft with a conveyor screw mounted thereon extends into the feed box; the shaft extends through the feed box to its exterior; a drive sprocket is mounted on the free end of the shaft; and the outer marginal portion of the ash ring is provided with a plurality of peripherally spaced depending teeth engageable by the sprocket to cause rotation of the ash ring.

Claim 19

Apparatus as claimed in claim 16; in which an air supply conduit surrounds the fuel supply tube and is connected to a source of pressurized air at a first end and connected at the second end to the intake portion of the feed box; an air passage is formed in the feed box at each side of the fuel passage with an intake end communicating with the air supply conduit and a discharge end terminating in the supporting plate in the area beneath the burner grid and between the delivery ring and the stabilizing flange to supply combustion air to the grid.