Cement kiln tail burner for alternative fuel
By adding a replacement fuel conveying device to the pulverized coal burner at the tail of the cement kiln, and using a conical dispersing cylinder and a screw conveyor for multi-stage dispersion, the problem of high nitrogen oxide emissions has been solved, achieving low-emission and low-cost combustion effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 山东信贶节能环保有限公司
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-08
AI Technical Summary
In existing cement kiln tail pulverized coal burners, nitrogen oxide emissions account for a high proportion, leading to excessive pollutant emissions and increased pollution control costs.
A replacement fuel delivery device, including a conical dispersion cylinder, a dispersing unit, and a screw conveyor, is added to the pulverized coal burner to deliver the crushed biofuel through multi-stage dispersing operations, thereby reducing nitrogen oxide generation and emissions.
It effectively reduced the generation and emission of nitrogen oxides, reduced pollutant emissions, and lowered pollution control costs.
Smart Images
Figure CN224215799U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of burner technology, specifically to a cement kiln tail burner for alternative fuels. Background Technology
[0002] The pulverized coal burner at the tail of the cement kiln is the core thermal equipment in the cement production line. Its working principle is to mix pulverized coal with air through the conveying system and then inject it into the kiln at high speed to form a stable flame, providing the heat required for the calcination of cement clinker.
[0003] Existing cement kiln tail pulverized coal burners simply inject pulverized coal into the cement kiln through a pneumatic transmission system for combustion. However, thermal nitrogen oxides typically account for 60%-80% of nitrogen oxide emissions from pulverized coal combustion. This not only significantly increases pollution control costs but also leads to excessive pollutant emissions. Therefore, there is an urgent need for a burner that can replace the fuel. Utility Model Content
[0004] To address the technical problems existing in the background art, this utility model provides a cement kiln tail burner for alternative fuels.
[0005] The technical solution of this utility model is as follows:
[0006] A cement kiln tail burner for alternative fuel includes a pulverized coal burner body, a pulverized coal conveying device and a pneumatic conveying device connected to the pulverized coal burner body, a pulverized coal channel connected to the pulverized coal conveying device inside the pulverized coal burner body, a replacement fuel channel inside the pulverized coal burner body, and a replacement fuel conveying device outside the pulverized coal burner body.
[0007] The replacement fuel conveying device includes a cylindrical fuel dispersing chamber. The upper end of the fuel dispersing chamber is a feeding port, and the lower end is connected to the replacement fuel channel through a conveying unit. A fuel dispersing assembly is provided in the middle of the fuel dispersing chamber. The fuel dispersing assembly includes a conical dispersing cylinder and a dispersing unit arranged sequentially from top to bottom. The axis of the conical dispersing cylinder is coaxial with the axis of the fuel dispersing chamber, and the bottom diameter of the conical dispersing cylinder is larger than the top diameter. The lower part of the conical dispersing cylinder and the inner wall of the fuel dispersing chamber form an annular channel for the replacement fuel to fall. The dispersing unit is set corresponding to the annular channel.
[0008] The replacement fuel is fuel crushed to a suitable particle size. During storage and transportation, the fuel may clump or agglomerate, requiring timely dispersal. The specific structure of the dispersal unit is as follows: the dispersal unit includes a rotating shaft and a motor connected to it. The motor is installed inside a conical dispersing cylinder. The axis of the rotating shaft is coaxial with the axis of the conical dispersing cylinder. Multiple dispersing rods are arranged along the length of the rotating shaft. The end of the dispersing rod away from the rotating shaft extends directly below the annular channel.
[0009] The outer end of the dispersing rod is positioned such that the vertical distance between the bottom end of the conical dispersing cylinder and the inner wall of the fuel dispersing chamber is 0.5-5 cm greater than the vertical distance between the outer end of the dispersing rod and the inner wall of the fuel dispersing chamber, so as to facilitate the use of the outer section of the dispersing rod to disperse the replacement fuel falling from the conical dispersing cylinder.
[0010] To improve the dispersing area of the dispersing rods and the dispersing efficiency of agglomerated fuel replacement, multiple dispersing rods are perpendicularly connected to the rotating shaft, and the multiple dispersing rods are staggered.
[0011] The conveying unit is a screw conveyor, which is inclined downwards. The screw conveyor has an inlet and an outlet. The inlet is connected to the lower port of the fuel dispersing chamber, and the outlet is connected to the replacement fuel channel.
[0012] In order to pre-disperse the agglomerated replacement fuel on the conical dispersion cylinder, multiple oblique convex ridges are welded on the outer conical surface of the conical dispersion cylinder along its generatrix direction. When the replacement fuel is fed from the feed port, it can first contact the conical dispersion cylinder and the oblique convex ridges, and the oblique convex ridges will pre-disperse the agglomerated replacement fuel.
[0013] Furthermore, the oblique convex ridge has a dispersing tip on the side away from the outer conical surface, and the dispersing tip is arranged along the length direction of the oblique convex ridge.
[0014] The connection structure between the conical dispersion cylinder and the fuel dispersing chamber is such that the lower part of the conical dispersion cylinder is detachably connected to the inner wall of the fuel dispersing chamber through multiple connectors.
[0015] Furthermore, the motor is connected to the conical dispersion cylinder via an L-shaped connecting plate, and there are two L-shaped connecting plates symmetrically arranged.
[0016] To facilitate the transport of replacement fuel, the screw conveyor is tilted at an angle of 30°-40°.
[0017] The beneficial effects of this utility model are as follows:
[0018] By adding a replacement fuel delivery device connected to the original pulverized coal burner, the replacement fuel delivery device can be opened before carbon emissions exceed the standard. Replacement fuel is delivered to the burner through the replacement fuel delivery device, thereby reducing the generation and emission of nitrogen oxides. The replacement fuel can be pre-crushed biofuel.
[0019] To prevent the replacement fuel from clumping due to moisture during storage and transportation, which would affect its delivery to the burner, the replacement fuel is pre-dispersed by a conical dispersion cylinder before entering the burner, then further dispersed by the dispersing rod of the dispersing unit, and finally conveyed into the burner by a screw conveyor. Through multi-stage dispersing operations, the clumped replacement fuel is broken up, making it easier to flow through the burner via the pneumatic conveying device until it is burned in the kiln.
[0020] The outer surface of the conical dispersion cylinder is conical, which can disperse the replacement fuel fed into the feed port to various angles. Then, the dispersing tip on the upper end of the inclined convex ridge pre-disperses the agglomerated replacement fuel into small clumps or clusters. Multiple dispersing rods distributed on the upper and lower sides further disperse the small clumps or clusters. Attached Figure Description
[0021] In the attached diagram:
[0022] Figure 1 This is a structural diagram;
[0023] Figure 2 This is a front view;
[0024] Figure 3 This is a top view;
[0025] Figure 4 for Figure 3 A schematic diagram of the AA-direction cross-section structure;
[0026] Figure 5 for Figure 4 A magnified structural diagram at point A;
[0027] Figure 6 This is a schematic diagram of the conical dispersion cylinder and the dispersing unit structure;
[0028] Figure 7 for Figure 6 A magnified structural diagram at point B;
[0029] The components represented by the various reference numerals in the diagram are:
[0030] 1. Pulverized coal burner body; 2. Pulverized coal conveying device; 3. Pneumatic conveying device; 4. Replacement fuel channel; 5. Fuel dispersing chamber; 6. Conical dispersing cylinder; 7. Rotating shaft; 8. Motor; 9. L-shaped connecting plate; 10. Dispersing rod; 11. Screw conveyor; 1101. Feed inlet; 1102. Discharge outlet; 12. Slanted convex ridge; 13. Dispersing tip; 14. Connecting parts. Detailed Implementation
[0031] See Figure 1 , Figure 2 and Figure 3As shown, a cement kiln tail burner for alternative fuel includes a pulverized coal burner body 1. A pulverized coal conveying device 2 and a pneumatic conveying device 3 are connected to the pulverized coal burner body 1. The pulverized coal burner body 1, the pulverized coal conveying device 2, and the pneumatic conveying device 3 are all new technologies. The pulverized coal conveying device 2 is used to convey pulverized coal into the pulverized coal burner body 1. The pneumatic conveying device 3 is located at the injection port end away from the pulverized coal burner body 1 and is used to convey pressurized air into the pulverized coal burner body 1. The pulverized coal burner body 1 has a pulverized coal channel that is connected to the pulverized coal conveying device 2. The pulverized coal burner body 1 also has a replacement fuel channel 4. The replacement fuel conveying device is located on the outside of the pulverized coal burner body 1.
[0032] The replacement fuel conveying device includes a cylindrical fuel dispersing chamber 5. The upper end of the fuel dispersing chamber 5 is a feeding port, and the lower end is connected to the replacement fuel channel 4 through a conveying unit. A fuel dispersing assembly is provided in the middle of the fuel dispersing chamber 5. The fuel dispersing assembly includes a conical dispersing cylinder 6 and a dispersing unit arranged sequentially from top to bottom. The axis of the conical dispersing cylinder 6 is coaxial with the axis of the fuel dispersing chamber 5, and the bottom diameter of the conical dispersing cylinder 6 is larger than the top diameter. The top of the conical dispersing cylinder 6 is located at the top. The replacement material moves downward from the top along the outer conical surface of the conical dispersing cylinder 6. The lower part of the conical dispersing cylinder 6 and the adjacent inner wall of the fuel dispersing chamber 5 form an annular channel for the replacement fuel to fall. The dispersing unit is set corresponding to the annular channel.
[0033] By adding a replacement fuel delivery device connected to the original pulverized coal burner, the replacement fuel delivery device can be opened before carbon emissions exceed the standard. Replacement fuel is delivered to the burner through the replacement fuel delivery device, reducing the generation and emission of nitrogen oxides. The replacement fuel can be crushed biofuel. The three parameters of the pneumatic delivery device are adaptively adjusted according to the characteristics of the replacement fuel.
[0034] See Figure 4 , Figure 5 and Figure 6 As shown, the replacement fuel is crushed into suitable particles. During storage and transportation, the replacement fuel may clump or agglomerate, requiring timely dispersing. The dispersing unit includes a rotating shaft 7 and a motor 8 connected to it. The motor 8 can drive the rotating shaft 7 to rotate. The motor 8 is installed inside the conical dispersing cylinder 6 through two symmetrically arranged L-shaped connecting plates 9, so that the conical dispersing cylinder 6 can protect the electrodes. The axis of the rotating shaft 7 is coaxial with the axis of the conical dispersing cylinder 6. Multiple dispersing rods 10 are arranged along the length of the rotating shaft 7. The multiple dispersing rods 10 are staggered vertically. The end of the dispersing rod 10 away from the rotating shaft 7 extends to the bottom of the annular channel, so that the dispersing rod 10 can disperse the replacement fuel falling from the annular channel.
[0035] The outer end of the dispersing rod 10 is positioned such that the vertical distance between the bottom end of the conical dispersing cylinder 6 and the inner wall of the fuel dispersing chamber 5 is 0.5-5 cm greater than the vertical distance between the outer end of the dispersing rod 10 and the inner wall of the fuel dispersing chamber 5, so that the outer rod section of the dispersing rod 10 can be used to disperse the replacement fuel falling from the conical dispersing cylinder 6.
[0036] To improve the dispersing area of the dispersing rod 10 and the dispersing efficiency of the agglomerated replacement fuel, multiple dispersing rods 10 are perpendicularly connected to the rotating shaft 7, and the multiple dispersing rods 10 are staggered.
[0037] The conveying unit is a screw conveyor 11, which is inclined downwards. The screw conveyor 11 has an inlet 1101 and an outlet 1102. The inlet 1101 is connected to the lower port of the fuel dispersing chamber 5, and the outlet 1102 is connected to the replacement fuel channel 4. The outlet 1102 is not on the same side as the discharge port of the pulverized coal conveying device 2. To facilitate the conveying of replacement fuel, the inclination angle of the screw conveyor 11 is 30°-40°.
[0038] See Figure 6 and Figure 7 As shown, to pre-disperse agglomerated replacement fuel on the conical dispersion cylinder 6, multiple oblique protrusions 12 are welded to the outer conical surface of the conical dispersion cylinder 6 along its generatrix. When the replacement fuel is fed from the feed port, it can first contact the conical dispersion cylinder 6 and the oblique protrusions 12, and the oblique protrusions 12 pre-disperse the agglomerated replacement fuel. The oblique protrusion 12 has a dispersing tip 13 on the side away from the outer conical surface, and the dispersing tip 13 is arranged along the length direction of the oblique protrusion 12.
[0039] The connection structure between the conical dispersion cylinder 6 and the fuel dispersing chamber 5 is such that the lower part of the conical dispersion cylinder 6 is detachably connected to the inner wall of the fuel dispersing chamber 5 through multiple connectors 14, and the multiple connectors 14 are evenly distributed along the circumferential direction.
Claims
1. A cement kiln tail burner for alternative fuel, comprising a pulverized coal burner body (1), wherein a pulverized coal conveying device (2) and a pneumatic conveying device (3) are connected to the pulverized coal burner body (1), and a pulverized coal channel corresponding to and connected to the pulverized coal conveying device (2) is provided inside the pulverized coal burner body (1), characterized in that, The pulverized coal burner body (1) is also provided with a replacement fuel channel (4), and a replacement fuel conveying device is provided on the outside of the pulverized coal burner body (1); The replacement fuel conveying device includes a cylindrical fuel dispersing chamber (5). The upper end of the fuel dispersing chamber (5) is a feeding port, and the lower end is connected to the replacement fuel channel (4) through a conveying unit. A fuel dispersing component is provided in the middle of the fuel dispersing chamber (5). The fuel dispersing component includes a conical dispersing cylinder (6) and a dispersing unit arranged sequentially from top to bottom. The axis of the conical dispersing cylinder (6) is coaxial with the axis of the fuel dispersing chamber (5), and the bottom diameter of the conical dispersing cylinder (6) is larger than the top diameter. The lower part of the conical dispersing cylinder (6) and the inner wall of the fuel dispersing chamber (5) form an annular channel for the replacement fuel to fall. The dispersing unit is set corresponding to the annular channel.
2. The cement kiln tail burner for alternative fuel according to claim 1, characterized in that, The dispersing unit includes a rotating shaft (7) and a motor (8) connected thereto. The motor (8) is installed inside the conical dispersing cylinder (6). The axis of the rotating shaft (7) is coaxial with the axis of the conical dispersing cylinder (6). Multiple dispersing rods (10) are provided on the rotating shaft (7) along its length direction. The end of the dispersing rod (10) away from the rotating shaft (7) extends to the bottom of the annular channel.
3. A cement kiln tail burner for alternative fuel according to claim 2, characterized in that, The vertical distance between the bottom end of the conical dispersion cylinder (6) and the inner wall of the fuel dispersion chamber (5) is greater than the vertical distance between the outer end of the dispersion rod (10) and the inner wall of the fuel dispersion chamber (5) by 0.5-5 cm.
4. A cement kiln tail burner for alternative fuel according to claim 2, characterized in that, The multiple dispersing rods (10) are all perpendicularly connected to the rotating shaft (7), and the multiple dispersing rods (10) are staggered.
5. A cement kiln tail burner for alternative fuels according to claim 1, characterized in that, The conveying unit is a screw conveyor (11), which is inclined downward. The screw conveyor (11) has a feed inlet (1101) and a discharge outlet (1102). The feed inlet (1101) is connected to the lower port of the fuel dispersing chamber (5), and the discharge outlet (1102) is connected to the replacement fuel channel (4).
6. A cement kiln tail burner for alternative fuels according to claim 1, characterized in that, The outer conical surface of the conical dispersion cylinder (6) is welded with multiple oblique protrusions (12) along its generatrix direction.
7. A cement kiln tail burner for alternative fuel according to claim 6, characterized in that, The oblique convex ridge (12) has a dispersing tip (13) on the side away from the outer conical surface, and the dispersing tip (13) is arranged along the length direction of the oblique convex ridge (12).
8. A cement kiln tail burner for alternative fuels according to claim 1, characterized in that, The lower part of the conical dispersion cylinder (6) is detachably connected to the inner wall of the fuel dispersion chamber (5) via multiple connectors (14).
9. A cement kiln tail burner for alternative fuels according to claim 2, characterized in that, The motor (8) is connected to the conical dispersion cylinder (6) through an L-shaped connecting plate (9), and there are two L-shaped connecting plates (9) symmetrically arranged.
10. A cement kiln tail burner for alternative fuel according to claim 5, characterized in that, The tilt angle of the screw conveyor (11) is 30°-40°.