Cement kiln burner device and method for operating the same

A method for operating the cement kiln burner device including a plurality of flow channels partitioned by a plurality of concentric cylindrical members, wherein the cement kiln burner device comprises:

• a powdered-solid-fuel flow channel including means for swirling a powdered solid fuel flow;
• a first air flow channel placed inside the powdered-solid-fuel flow channel to be adjacent to the powdered-solid-fuel flow channel, the first air flow channel including means for swirling an air flow;
• an outer air flow-channel group placed concentrically in an outermost side outside the powdered-solid-fuel flow channel, the outer air flow-channel group including three or more second air flow channels adapted to form means for straightly forwarding an air flow;
• and
• a combustible-solid-waste flow channel placed inside the first air flow channel, wherein the three or more second air flow channels constituting the outer air flow-channel group are placed proximally to each other in a radial direction within a range where air flows ejected from the respective second air flow channels are merged to form a single air flow, and are configured to control flow rates of the air flows ejected from the respective second air flow channels, independently for each second air flow channel,
• said method comprising ejecting an air flow from at least one second air flow channel, out of the second air flow channels constituting the outer air flow-channel group, wherein air flows ejected from all the second air flow channels have a flow velocity of 400 m/s or less at a burner tip
• the air flow containing the powdered solid fuel which is ejected from the powdered-solid-fuel flow channel has a flow velocity of 30 m/s to 80 m/s at the burner tip,
• the air flow ejected from the first air flow channel has a flow velocity of 5 m/s to 240 m/s at the burner tip, and
• an air flow containing a combustible solid waste which is ejected from the combustible-solid-waste flow channel has a flow velocity of 30 m/s to 80 m/s at the burner tip.

A method for operating the cement kiln burner device including a plurality of flow channels partitioned by a plurality of concentric cylindrical members, wherein the cement kiln burner device comprises:

• a powdered-solid-fuel flow channel including means for swirling a powdered solid fuel flow;
• a first air flow channel placed inside the powdered-solid-fuel flow channel to be adjacent to the powdered-solid-fuel flow channel, the first air flow channel including means for swirling an air flow;
• an outer air flow-channel group placed concentrically in an outermost side outside the powdered-solid-fuel flow channel, the outer air flow-channel group including three or more second air flow channels adapted to form means for straightly forwarding an air flow;
• and
• a combustible-solid-waste flow channel placed inside the first air flow channel, wherein the three or more second air flow channels constituting the outer air flow-channel group are placed proximally to each other in a radial direction within a range where air flows ejected from the respective second air flow channels are merged to form a single air flow, and are configured to control flow rates of the air flows ejected from the respective second air flow channels, independently for each second air flow channel,
• said method comprising ejecting an air flow from at least one second air flow channel, out of the second air flow channels constituting the outer air flow-channel group, wherein
• air flows ejected from all the second air flow channels have a flow velocity of 400 m/s or less at a burner tip,
• the cement kiln burner device further includes a third air flow channel placed outside the powdered-solid-fuel flow channel and inside the outer air flow-channel group, the third air flow channel including means for swirling an air flow, and
• an air flow ejected from the third air flow channel has a swirl angle of 1 degree to 50 degrees at the burner tip, and further has a flow velocity of 60 m/s to 240 m/s at the burner tip.

A method for operating the cement kiln burner device including a plurality of flow channels partitioned by a plurality of concentric cylindrical members, wherein the cement kiln burner device comprises:

• a powdered-solid-fuel flow channel including means for swirling a powdered solid fuel flow;
• a first air flow channel placed inside the powdered-solid-fuel flow channel to be adjacent to the powdered-solid-fuel flow channel, the first air flow channel including means for swirling an air flow;
• an outer air flow-channel group placed concentrically in an outermost side outside the powdered-solid-fuel flow channel, the outer air flow-channel group including three or more second air flow channels adapted to form means for straightly forwarding an air flow;
• and
• a combustible-solid-waste flow channel placed inside the first air flow channel, wherein the three or more second air flow channels constituting the outer air flow-channel group are placed proximally to each other in a radial direction within a range where air flows ejected from the respective second air flow channels are merged to form a single air flow, and are configured to control flow rates of the air flows ejected from the respective second air flow channels, independently for each second air flow channel,
• said method comprising ejecting an air flow from at least one second air flow channel, out of the second air flow channels constituting the outer air flow-channel group, wherein
• air flows ejected from all the second air flow channels have a flow velocity of 400 m/s or less at a burner tip, and
• a combustible solid waste ejected from the combustible-solid-waste flow channel has a particle size of 30 mm or less.