Fluidized calciner
A fluidized calciner is provided which allows a reduction in the rate of unburned fuel at an outlet of a fluidized calciner to enable sufficient calcination while preventing possible occlusion in a preheater, even when pulverized coal of coal or coke, which has low combustion quality, is used as fuel, based on calculations in accordance with computational fluid dynamics based on the shape of an actual furnace and operational conditions. The present invention provides a fluidized calciner including a tubular furnace body ( 2 ) in which an axial direction is an up-down direction, a pulverized coal blowing line ( 3 ) through which fuel is blown into the furnace body ( 2 ), a raw material chute ( 4 ) through which a cement raw material is loaded into the furnace body ( 2 ), at least one air introduction pipe ( 5 ) through which introduced air is sucked, the pulverized coal blowing line ( 3 ), the raw material chute ( 4 ), and the air introduction pipe ( 5 ) being connected to a side portion of the furnace body ( 2 ), and a fluidizing air blowing port ( 6 ) disposed at a bottom portion of the furnace body ( 2 ) and through which fluidizing air is blown into the furnace body ( 2 ), in which a blowing port of the pulverized coal blowing line ( 3 ) is disposed below a suction port of the air introduction pipe ( 5 ) and above the fluidizing air blowing port ( 6 ).
1. A fluidized calciner comprising a tubular furnace body in which an axial direction thereof is an up-down direction, a pulverized coal blowing line through which fuel is blown into the furnace body, a raw material chute through which a cement raw material is loaded into the furnace body, at least one air introduction pipe comprising an air inlet through which air enters the air introduction pipe and a suction port through which air is introduced into the calciner, the pulverized coal blowing line, the raw material chute, and the air introduction pipe being connected to a side portion of the furnace body, and a fluidizing air blowing port disposed at a bottom portion of the furnace body and through which fluidizing air is blown into the furnace body,
wherein a blowing port of the pulverized coal blowing line is connected to the furnace body perpendicular to a shaft center line thereof so as to extend toward the center of the furnace body and the center of the blowing port of the pulverized coal blowing line is disposed in alignment with the center of the air introduction pipe with respect to the vertical direction, and the blowing port of the pulverized coal blowing line is disposed below the suction port of the air introduction pipe, and wherein the center of the blowing port of the pulverized coal blowing line is disposed at a position 200 mm away from the fluidizing air blowing port and at a position of 35 to 145° from a center of a loading port of the raw material chute with respect to a circumferential direction of the furnace body.
2. A fluidized calciner comprising a tubular furnace body in which an axial direction thereof is an up-down direction, a pulverized coal blowing line through which fuel is blown into the furnace body, a raw material chute through which a cement raw material is loaded into the furnace body, at least one air introduction pipe comprising an air inlet through which air enters the air introduction pipe and a suction port through which air is introduced into the calciner, the pulverized coal blowing line, the raw material chute, and the air introduction pipe being connected to a side portion of the furnace body, and a fluidizing air blowing port disposed at a bottom portion of the furnace body and through which fluidizing air is blown into the furnace body,
wherein a blowing port of the pulverized coal blowing line is connected to the furnace body perpendicular to a shaft center line thereof so as to extend toward the center of the furnace body and the center of the blowing port of the pulverized coal blowing line is disposed in alignment with the center of the air introduction pipe with respect to the vertical direction, and the blowing port of the pulverized coal blowing line is disposed below the suction port of the air introduction pipe, and wherein the center of the blowing port of the pulverized coal blowing line is disposed at a position at least 350 mm away from the fluidizing air blowing port and at a position of 90 to 145° from a center of a loading port of the raw material chute with respect to a circumferential direction of the furnace body.
3. A fluidized calciner comprising a tubular furnace body in which an axial direction thereof is an up-down direction, a pulverized coal blowing line through which fuel is blown into the furnace body, a raw material chute through which a cement raw material is loaded into the furnace body, at least one air introduction pipe comprising an air inlet through which air enters the air introduction pipe and a suction port through which air is introduced into the calciner, the pulverized coal blowing line, the raw material chute, and the air introduction pipe being connected to a side portion of the furnace body, and a fluidizing air blowing port disposed at a bottom portion of the furnace body and through which fluidizing air is blown into the furnace body,
wherein a blowing port of the pulverized coal blowing line is connected to the furnace body perpendicular to a shaft center line thereof so as to extend toward the center of the furnace body and the center of the blowing port of the pulverized coal blowing line is disposed in alignment with the center of the air introduction pipe with respect to the vertical direction, and the blowing port of the pulverized coal blowing line is disposed below the suction port of the air introduction pipe, and wherein the center of the blowing port of the pulverized coal blowing line is disposed at a position at least 200 mm away from the fluidizing air blowing port and at a position of 100 to 120° from a center of a loading port of the raw material chute with respect to a circumferential direction of the furnace body.