Combustible waste injection device and method for operating the same

Patent metadata

Field	Value
Publication number	US-11029025-B2
Application number	US-201916976724-A
Country	US
Kind code	B2
Filing date	Aug 14, 2019
Priority date	Aug 14, 2019
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

There is provided a combustible waste injection device and a method for operating the same which can suppress a landing combustion of a combustible waste and suppress excessive change of a flame state from a cement kiln burner even if a rate of using the combustible waste fluctuates. A combustible waste injection device according to the present invention has a combustible waste flow channel which is arranged in an inner side of the air flow channel in an innermost shell, is installed in parallel to an axial direction of the cement kiln burner device and is provided for flow feeding a combustible waste flow, and the combustible waste flow channel has an inclined surface having a rising slope toward the injection port near the injection port in such a manner that a flow channel width in a vertical direction is narrowed toward the injection port.

First claim

What is claimed is:

1. A combustible waste injection device which can be attached to a cement kiln burner device having at least one air flow channel in an inner side of a powdered-solid-fuel flow channel, the combustible waste injection device comprising:
a combustible waste flow channel which is arranged in an inner side of the air flow channel in an innermost shell, is installed in parallel to an axial direction of the cement kiln burner device and is provided for feeding a combustible waste flow,
wherein the combustible waste flow channel has an inclined surface formed near the injection port, the inclined surface having a rising slope toward the injection port in such a manner that a combustible waste flow channel width in a vertical direction is narrowed toward the injection port with a combustible waste flow channel width in a horizontal direction being maintained.

2. The combustible waste injection device according to claim 1 , wherein the inclined surface is positioned at a position where an opposite end portion to the injection port of the combustible waste flow channel in the axial direction is between 150 mm and 2000 mm away from the injection port, and an elevation angle thereof is between 1 degree and 4 degrees.

3. The combustible waste injection device according to claim 1 , further comprising an assist air inflow port which can flow an assist air flow into the combustible waste flow channel toward the axis center of the combustible waste flow channel at a position where the inclined surface is formed in the combustible waste flow channel, wherein the assist air inflow port is arranged at a plurality of positions in a circumferential direction.

4. The combustible waste injection device according to claim 3 , wherein the assist air inflow port is arranged at a plurality of positions sandwiching in a vertical direction a horizontal plane including the axis center of the combustible waste flow channel when cutting with a plane orthogonal to the axis center of the combustible waste flow channel.

5. The combustible waste injection device according to claim 4 , wherein the combustible waste flow channel is adapted to be capable of ejecting the combustible waste flow upward in the vertical direction after a width of the combustible waste flow is reduced in the direction toward the axis center by the assist air flow flowing into the combustible waste flow channel from the assist air inflow port.

6. The combustible waste injection device according to claim 3 , wherein the assist air inflow port is installed in a range between 10 mm and 600 mm from the injection port of the combustible waste flow channel.

7. A method for operating the combustible waste injection device according to claim 1 , wherein the method comprises ejecting the combustible waste flow from the combustible waste flow channel vertically upward from the horizontal plane.

8. The method for operating the combustible waste injection device according to claim 7 , further comprising an assist air inflow port which can flow an assist air flow into the combustible waste flow channel toward the axis center of the combustible waste flow channel at a position where the inclined surface is formed in the combustible waste flow channel, wherein the assist air inflow port is arranged at a plurality of positions in a circumferential direction, and wherein an upward assist air flow rate flowed into the combustible waste flow channel from the vertically lower side of the horizontal plane is equal to or more than a downward assist air flow rate flowed into the combustible waste flow channel from the vertically upper side of the horizontal plane.

9. The method for operating the combustible waste injection device according to claim 8 , wherein a total amount of the air flow rates flowed into the combustible waste flow channel from the assist air inflow port is between 5 volume % to 65 volume % of a primary air flow rate flowing in the combustible waste flow channel.

10. The method for operating the combustible waste injection device according to claim 8 , wherein a rate of the downward assist air flow rate with respect to the upward assist air flow rate is between 0.5 and 1.0.

11. The method for operating the combustible waste injection device according to claim 8 , wherein an inflow angle of the assist air flow flowed into the combustible waste flow channel is greater than 0 degrees and equal to or less than 90 degrees with respect to the flow feeding direction of the combustible waste flow which flow feeds within the combustible waste flow channel.

Assignees

• Taiheiyo Cement Corp

Inventors

• Sano Yuya
• Naitou Kouichi
• Tsukidate Hidenori
• Sugaya Hideyuki

Classifications

• F27B7/34 Primary

  Arrangements of heating devices · CPC title

• F23G5/033 Primary

  comminuting or crushing · CPC title

• F23G2205/20

  using airblast or pneumatic feeding · CPC title

• F23G5/444

  for solid waste (F23G5/448 takes precedence) · CPC title

• F23G5/50

  Control or safety arrangements · CPC title