Quantitative pulverized coal feeding device capable of introducing tertiary air

Abstract

The utility model discloses a pulverized coal quantitative feeding device capable of introducing tertiary air, which comprises a pulverized coal bin, a quantitative bin is arranged below the pulverized coal bin, a feeding cylinder is arranged below the quantitative bin in a penetrating way, the right end of the feeding cylinder is connected with a blanking cylinder, the lower end of the blanking cylinder is provided with a coal injection pipe, and the coal injection pipe is connected with a feeding pipe. A tertiary tuyere is formed in the outer side of the discharging barrel, a Roots blower is installed on the left side of the tertiary tuyere, and a combustion-supporting device is installed between the Roots blower and the tertiary tuyere. The Roots blower is introduced to one side of the tertiary tuyere, the air outlet of the Roots blower is connected with the combustion-supporting device, when pulverized coal enters the tertiary tuyere, the igniter is used for igniting the pulverized coal, the Roots blower blows air to enable flames of the igniter to be concentrated in the same direction, combustion supporting can be accurately conducted on the pulverized coal, combustion is conducted in advance in the tertiary tuyere, and the combustion-supporting effect is good. Therefore, when the temperature in the kiln head is too low, the injected pulverized coal can be burnt instantly, and then the inlet air temperature of the kiln head boiler and the total steam evaporation capacity of the kiln head boiler are compensated.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a coal powder quantitative feeding device capable of introducing tertiary air. Background Art

[0002] When cement kilns are calcining cement clinker, coal powder is added as fuel for combustion. Controlling the ratio of coal powder can improve the combustion efficiency of coal powder. The coal powder bin is an indispensable component of the kiln head structure. Fuel is fed from the kiln head through the coal powder bin to control the temperature inside the kiln. Therefore, coal powder is an important fuel in the cement production calcination process.

[0003] The existing pulverized coal feeding device is not conducive to combustion support during the three return air during the feeding process. When the temperature difference inside the kiln head is small, the combustion point is insufficient, which reduces the inlet air temperature and the total evaporation of kiln head boiler steam, thereby reducing the combustion completeness and efficiency of the pulverized coal.

[0004] Therefore, those skilled in the art provide a coal powder quantitative feeding device capable of introducing tertiary air to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0005] The utility model aims to provide a quantitative coal powder feeding device capable of introducing tertiary air, so as to solve the problem that the existing coal powder feeding device proposed in the above background technology is not conducive to combustion support.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A pulverized coal quantitative feeding device capable of introducing tertiary air comprises: a pulverized coal bin, a quantitative bin is installed below the pulverized coal bin, and a feeding cylinder is installed below the quantitative bin, the right end of the feeding cylinder is connected to a lowering cylinder, and a coal injection pipe is installed at the lower end of the lowering cylinder, a tertiary air port is installed on the outer side of the lowering cylinder, a Roots blower is installed on the left side of the tertiary air port, and a combustion aid is installed between the Roots blower and the tertiary air port, an air duct is installed on the side of the combustion aid facing the inside of the tertiary air port, and a vent is provided on the right side of the air duct, and an igniter for ignition is installed on the outer side of the air duct.

[0008] As a further solution of the present invention, a feeding auger for feeding materials is installed inside the feeding barrel, and a driving motor is installed at one end of the feeding auger, and an opening is opened on the surface of the feeding barrel.

[0009] As a further solution of the present invention, an inner cavity is installed inside the quantitative bin, and a feed port is arranged above the inner cavity, and a discharge port is arranged below the inner cavity.

[0010] As a further solution of the present invention, a rotating shaft is installed inside the inner cavity, and the center line of the rotating shaft is connected to a servo motor for driving, and a rotating bucket is installed on the surface of the rotating shaft.

[0011] As a further solution of the present invention, the rotating bucket is distributed in a ring shape with respect to the center line of the rotating shaft, and the inlet width of the rotating bucket is consistent with the width of the opening.

[0012] As a further solution of the utility model, a kiln head pipe is connected to the right side of the tertiary air port, and the interior of the tertiary air port is connected to the air outlet of the Roots blower through an air duct.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] A Roots blower is introduced on one side of the tertiary air inlet, and the air outlet of the Roots blower is connected to the combustion aid. When the pulverized coal enters the tertiary air inlet, the igniter is used to ignite the pulverized coal. The Roots blower blows air to make the flame of the igniter concentrate in one direction, which can accurately assist the combustion of the pulverized coal and carry out early combustion inside the tertiary air inlet. In this way, when the temperature inside the kiln head is too low, the injected pulverized coal can burn instantly, thereby compensating for the kiln head boiler inlet air temperature and the total evaporation of kiln head boiler steam. This is beneficial for combustion compensation when the total evaporation of kiln head boiler steam cannot meet the rated demand of the steam turbine unit and the kiln head waste heat temperature is low, thereby improving the combustion completeness and combustion efficiency of the pulverized coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The diagram is a structural diagram of a pulverized coal quantitative feeding device capable of introducing tertiary air.

[0016] Figure 2 The diagram is a structural diagram of a Roots blower in a pulverized coal quantitative feeding device capable of introducing tertiary air.

[0017] Figure 3 The present invention is a schematic diagram of the structure of the connection between the feeding cylinder and the lower cylinder in a pulverized coal quantitative feeding device capable of introducing tertiary air.

[0018] Figure 4 The figure is a schematic diagram of the internal structure of the inner cavity of a pulverized coal quantitative feeding device capable of introducing tertiary air.

[0019] In the figure: 1. Pulverized coal bin; 2. Dosing bin; 3. Feeding barrel; 4. Driving motor; 5. Tertiary air inlet; 6. Kiln head pipe; 7. Roots blower; 8. Combustion aid; 9. Air duct; 10. Ignitor; 11. Ventilation port; 12. Opening; 13. Feeding auger; 14. Feeding barrel; 15. Coal injection pipe; 16. Inner cavity; 17. Servo motor; 18. Rotating shaft; 19. Rotating bucket; 20. Feed inlet; 21. Discharge port. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 to Figure 4 The embodiment of the utility model provides a pulverized coal quantitative feeding device capable of introducing tertiary air, comprising: a pulverized coal bin 1, a quantitative bin 2 is installed below the pulverized coal bin 1, and a feeding cylinder 3 is inserted below the quantitative bin 2, an inner cavity 16 is installed inside the quantitative bin 2, and a feed port 20 is arranged above the inner cavity 16, and a discharge port 21 is arranged below the inner cavity 16, a rotating shaft 18 is installed inside the inner cavity 16, and a servo motor 17 for driving is connected to the center line of the rotating shaft 18, a rotating bucket 19 is installed on the surface of the rotating shaft 18, and the rotating bucket 19 is distributed in a ring shape with respect to the center line of the rotating shaft 18, and the inlet width of the rotating bucket 19 is consistent with the width of the opening 12;

[0022] Specifically, through the setting of the metering bin 2, the coal powder can be quantitatively put in, and the rotating bucket 19 is used to quantitatively load the coal powder. The outer wall of the rotating head 19 is close to the inner wall of the inner cavity 16. When the rotating bucket 19 rotates clockwise, the rotating bucket rotates from the position of the feed port 20 to the position of the discharge port 21, and then the coal powder inside the bucket is put into the inside of the feeding tube 3, and then the feeding tube 3 is used to transport the coal powder.

[0023] The right end of the feeding barrel 3 is connected to a lowering barrel 14, and a coal injection pipe 15 is installed at the lower end of the lowering barrel 14. A tertiary air port 5 is installed on the outer side of the lowering barrel 14. A feeding auger 13 for feeding is installed inside the feeding barrel 3, and a driving motor 4 is installed at one end of the feeding auger 13. An opening 12 is opened on the surface of the feeding barrel 3.

[0024] Specifically, the pulverized coal can be sprayed into the tertiary tuyere 5 through the lower barrel 14 and the coal injection pipe 15 inside the tertiary tuyere 5 .

[0025] A Roots blower 7 is installed on the left side of the tertiary air port 5, and a combustion aid 8 is installed between the Roots blower 7 and the tertiary air port 5. A kiln head pipe 6 is connected to the right side of the tertiary air port 5. The interior of the tertiary air port 5 is connected to the air outlet of the Roots blower 7 through an air duct 9. An air duct 9 is installed on the side of the combustion aid 8 facing the interior of the tertiary air port 5, and a vent 11 is provided on the right side of the air duct 9. An igniter 10 for ignition is installed on the outside of the air duct 9;

[0026] Specifically, the Roots blower 7 and the combustion aid 8 form a combustion chamber inside the tertiary air port 5. When the coal powder is sprayed into the tertiary air port 5, the igniter 10 on the combustion aid 8 is used to instantly ignite the coal powder. The Roots blower 7 blows air to concentrate the flame of the igniter 10 in one direction, which can accurately assist the combustion of the coal powder and carry out early combustion inside the tertiary air port 5.

[0027] The working principle of the utility model is:

[0028] When the utility model is used, the coal powder in the coal powder bin 1 enters the rotating bucket 19 in the quantitative bin 2 through the feed port 20. The rotating bucket 19 and the rotating shaft 18 are connected to each other. The servo motor 17 drives the rotating shaft 18 to rotate. The outer wall of the rotating head 19 is close to the inner wall of the inner cavity 16. When the rotating bucket 19 rotates clockwise, the rotating bucket rotates from the position of the feed port 20 to the position of the discharge port 21, and then the coal powder in the rotating bucket 19 is put into the inside of the feeding barrel 3 through the opening 12. The discharge port 21 in the feeding barrel 3 is connected to the rotating bucket 19. The material auger 13 pushes the coal powder toward the lower material barrel 14, and the coal powder enters the coal injection pipe 15 from the lower material barrel 14. Secondly, the coal powder is sprayed into the tertiary air port 5 by the coal injection pipe 15, and the coal powder is instantly ignited by the igniter 10 on the combustion aid 8. At the same time, the Roots blower 7 allows the flame of the igniter 10 to be concentrated in one direction through the air duct 9, which can accurately assist the combustion of the coal powder and carry out early combustion inside the tertiary air port 5, thereby compensating for the kiln head boiler inlet air temperature and the total evaporation of kiln head boiler steam, and assisting combustion at the air inlet.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pulverized coal quantitative feeding device capable of introducing tertiary air, characterized in that: include: A pulverized coal bin (1), wherein a metering bin (2) is installed below the pulverized coal bin (1), and a feeding cylinder (3) is installed below the metering bin (2), the right end of the feeding cylinder (3) is connected to a lowering cylinder (14), and a coal injection pipe (15) is installed at the lower end of the lowering cylinder (14), a tertiary air port (5) is installed on the outer side of the lowering cylinder (14), a Roots blower (7) is installed on the left side of the tertiary air port (5), and a combustion aid (8) is installed between the Roots blower (7) and the tertiary air port (5), an air duct (9) is installed on the side of the combustion aid (8) facing the inside of the tertiary air port (5), and a vent (11) is provided on the right side of the air duct (9), and an igniter (10) for ignition is installed on the outer side of the air duct (9).

2. A pulverized coal quantitative feeding device capable of introducing tertiary air according to claim 1, characterized in that: A feeding auger (13) for feeding materials is installed inside the feeding barrel (3), and a driving motor (4) is installed at one end of the feeding auger (13). An opening (12) is provided on the surface of the feeding barrel (3).

3. The pulverized coal quantitative feeding device capable of introducing tertiary air according to claim 1, characterized in that: An inner cavity (16) is installed inside the quantitative bin (2), and a feed port (20) is arranged above the inner cavity (16), and a discharge port (21) is arranged below the inner cavity (16).

4. A pulverized coal quantitative feeding device capable of introducing tertiary air according to claim 3, characterized in that: A rotating shaft (18) is installed inside the inner cavity (16), and a servo motor (17) for driving is connected to the center line of the rotating shaft (18), and a rotating bucket (19) is installed on the surface of the rotating shaft (18).

5. A pulverized coal quantitative feeding device capable of introducing tertiary air according to claim 4, characterized in that: The rotating bucket (19) is distributed in a ring shape about the center line of the rotating shaft (18), and the inlet width of the rotating bucket (19) is consistent with the width of the opening (12).

6. The pulverized coal quantitative feeding device capable of introducing tertiary air according to claim 1, characterized in that: The right side of the tertiary air port (5) is connected to a kiln head pipe (6), and the interior of the tertiary air port (5) is connected to an air outlet of a Roots blower (7) via an air duct (9).

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