Coal injection gun fluidization conveying structure

Abstract

The utility model relates to the technical field of pulverized coal conveying, and discloses a fluidization conveying structure of a coal injection gun. The coal injection gun fluidization conveying structure comprises an air blower, a heating pipe is fixedly installed on the rear side of the air blower, an electric heating pipe is fixedly installed in the heating pipe, a connecting pipe is fixedly installed at the rear end of the heating pipe, a connecting flange is fixedly installed at the rear end of the connecting pipe, and a limiting frame is fixedly installed on the outer side of the heating pipe. The rear end of the connecting flange is connected with a mixing pipe, the air inlet penetrates through the end cover to be communicated with an inner cavity of the mixing pipe, the air inlet points to the lower end of the coal inlet, and in this way, pulverized coal can make contact with airflow blown out of the air inlet in the process of entering the mixing pipe from the lower end of the coal inlet to fall down. The airflow can be discharged from the air inlet at a high flow speed, so that the pulverized coal entering the mixing pipe is blown away, and the pulverized coal is fluidized and prevented from being deposited below the coal inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder transportation, in particular to a fluidized transportation structure of a coal injection gun. Background Art

[0002] The coal injection gun is one of the important equipment of the blast furnace coal injection system. It is made of heat-resistant seamless steel pipes and is divided into two types according to the different injection media: ordinary coal injection guns and oxygen coal injection guns. The coal injection medium of ordinary coal injection guns is compressed air, while that of oxygen coal guns is oxygen.

[0003] The existing referenceable Chinese utility model patent with announcement number: CN201110559Y discloses a novel fluidized conveying device, which includes a powder-gas mixing cylinder body, a powder-gas spraying pipe connected to the powder-gas mixing cylinder body, an air pipe connected to the powder-gas mixing cylinder body, an air pipe outlet arranged at the bottom of the powder-gas mixing cylinder body, a filter plate arranged at the lower part of the powder-gas mixing cylinder body, and an air flow distribution plate arranged between the filter plate and the air pipe outlet. The beneficial effects of the utility model are that the coal powder (or petroleum coke powder) and the conveying medium (compressed air or nitrogen) are fully and evenly mixed, the conveying is uniform and stable, the fluidization effect is good, the combustion is sufficient and stable, the coal powder (or petroleum coke powder) injection amount can be adjusted, and then the length and temperature of the coal powder fire pit in the industrial kiln can be adjusted, and the device is provided with an observation and inspection hole. It has a simple structure and is easy to maintain.

[0004] The existing fluidized conveying structure of the coal injection gun generally conveys air to the inside of the tubular structure through a blower. The coal powder enters the inside of the pipeline structure from above and moves forward under the guidance of the air. In this way, the airflow cannot quickly break up the coal powder during the falling process, and the coal powder may be deposited under the coal inlet, affecting the coal powder conveying efficiency and fluidization effect. At the same time, the existing fluidized conveying equipment conveys coal powder to the inside of the blast furnace through airflow, which will reduce the temperature inside the blast furnace. The coal powder cannot quickly reach the combustion temperature, affecting the coal powder combustion efficiency. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a fluidized conveying structure for a coal injection gun, which has the advantages of preventing coal powder from being deposited at the coal inlet and enabling coal powder preheating to reduce the impact on the blast furnace temperature, thereby solving the above technical problems.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fluidized conveying structure of a coal injection gun, comprising: a blower, a heating tube fixedly installed on the rear side of the blower, an electric heating tube fixedly installed inside the heating tube, a connecting tube fixedly installed at the rear end of the heating tube, a connecting flange fixedly installed at the rear end of the connecting tube, a limiting frame fixedly installed on the outer side of the heating tube, a mixing tube connected to the rear end of the connecting flange, a coal inlet insertedly installed above the mixing tube, an oxygen inlet fixedly installed on the left side of the mixing tube, an end cover fixedly installed at the front end of the mixing tube, an air inlet insertedly installed below the end cover, and a connecting frame fixedly installed below the mixing tube; the heating tube can limit the gas flow direction.

[0009] As an optimal technical solution of the present invention, the air outlet of the blower is fixedly connected to the front end of the heating tube, and the electric heating tube is installed in a ring shape on the inner wall of the heating tube at an angle of forty-five degrees with the center of the heating tube as a reference; the blower can generate an airflow blowing toward the inside of the heating tube.

[0010] As a preferred technical solution of the utility model, the connecting pipe is a rubber hose, the front end of the connecting pipe is connected to the heating pipe, and the connecting pipe is connected to the blower through the heating pipe; the connecting pipe can facilitate the connection between the heating pipe and the air inlet.

[0011] As an optimal technical solution of the utility model, the limit frame is symmetrically installed on the front and rear sides of the electric heating tube with the center of the electric heating tube as the reference, and the bottom end of the limit frame and the bottom end of the blower are in the same plane; the limit frame can support the electric heating tube.

[0012] As the preferred technical solution of the utility model, the coal inlet is installed above the mixing tube at an inclination angle of thirty degrees, the coal inlet is connected to the inner cavity of the mixing tube, the inclination angle of the front end face of the mixing tube is consistent with the inclination angle of the coal inlet; the coal inlet can facilitate the coal powder to enter the interior of the mixing tube.

[0013] As a preferred technical solution of the present invention, the angle between the axis of the oxygen inlet and the axis of the mixing tube is thirty degrees. The oxygen inlet is installed at the upper left side and the lower right side of the mixing tube in a mirror-symmetrical manner with the center of the mixing tube as a reference. The inner wall of the oxygen inlet is tangent to the inner wall of the mixing tube; the oxygen inlet can facilitate the entry of oxygen into the interior of the mixing tube.

[0014] As a preferred technical solution of the utility model, the air inlet is perpendicular to the end face of the end cover, the air inlet is connected to the connecting pipe via a connecting flange, the air inlet passes through the end cover and is connected to the inner cavity of the mixing tube, and the air inlet points to the lower end of the coal inlet; the air inlet can guide the airflow to blow toward the lower end of the coal inlet.

[0015] Compared with the prior art, the utility model provides a fluidized conveying structure of a coal injection gun, which has the following beneficial effects:

[0016] 1. The utility model sets an air inlet, in which the coal inlet is installed above the mixing tube at an inclination angle of thirty degrees, which can reduce the speed at which coal powder falls. At the same time, the inclination angle of the front end face of the mixing tube is consistent with the inclination angle of the coal inlet, the air inlet and the end face of the end cover are perpendicular to each other, the air inlet is connected with the connecting pipe through a connecting flange, the air inlet passes through the end cover and is connected with the inner cavity of the mixing tube, and the air inlet points to the lower end of the coal inlet. In this way, the coal powder can contact with the airflow blown out from the air inlet during the process of falling from the lower end of the coal inlet into the mixing tube. Since the inner diameter of the air inlet is smaller than the inner diameter of the mixing tube, the airflow will be discharged from the air inlet at a higher flow rate, thereby blowing away the coal powder entering the mixing tube, so as to facilitate the fluidization of the coal powder and avoid the coal powder being deposited below the coal inlet.

[0017] 2. The utility model adopts the arrangement of electric heating tubes, wherein the air outlet of the blower is fixedly connected to the front end of the heating tube; the electric heating tube is installed in a ring shape on the inner wall of the heating tube at an angle of forty-five degrees with the center of the heating tube as a reference; the connecting tube is a rubber hose, and the front end of the connecting tube is connected to the heating tube; the connecting tube is connected to the blower through the heating tube; the airflow generated by the blower is heated under the action of the electric heating tube after passing through the inside of the heating tube, and then is blown to the pulverized coal through the connecting tube and the air inlet. This method can make the pulverized coal drier and reduce the impact on the internal temperature of the blast furnace, so as to improve the combustion efficiency of the pulverized coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection structure between the blower and the heating pipe of the utility model;

[0020] Figure 3 This is a schematic diagram of the installation structure of the mixing tube and the connecting tube of the utility model;

[0021] Figure 4 It is a schematic diagram of the horizontal and vertical cross-section structure of the mixing tube of the utility model;

[0022] Among them: 1. blower; 11. heating tube; 12. electric heating tube; 13. connecting tube; 14. connecting flange; 15. limit frame; 2. mixing tube; 21. coal inlet; 22. oxygen inlet; 23. end cover; 24. air inlet; 25. connecting frame. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0024] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1 - Figure 4 In this embodiment, a fluidized conveying structure of a coal injection gun includes: a blower 1, a heating pipe 11 is fixedly installed on the rear side of the blower 1, an electric heating pipe 12 is fixedly installed inside the heating pipe 11, a connecting pipe 13 is fixedly installed at the rear end of the heating pipe 11, a connecting flange 14 is fixedly installed at the rear end of the connecting pipe 13, and a limiting frame 15 is fixedly installed on the outer side of the heating pipe 11.

[0027] The air outlet of the blower 1 is fixedly connected to the front end of the heating tube 11, and the electric heating tube 12 is installed in a ring shape on the inner wall of the heating tube 11 at an angle of forty-five degrees based on the center of the heating tube 11.

[0028] The connecting pipe 13 is a rubber hose, the front end of which is connected to the heating pipe 11 , and the connecting pipe 13 is connected to the blower 1 through the heating pipe 11 .

[0029] The limiting frame 15 is symmetrically installed on the front and rear sides of the electric heating tube 12 with the center of the electric heating tube 12 as a reference, and the bottom end of the limiting frame 15 and the bottom end of the blower 1 are in the same plane.

[0030] Specifically, the blower 1 can generate an airflow blowing toward the inside of the heating tube 11, the heating tube 11 can limit the gas flow direction, the electric heating tube 12 can increase the internal temperature of the heating tube 11, the connecting tube 13 can facilitate the connection between the heating tube 11 and the air inlet 24, the connecting flange 14 can facilitate the connection between the connecting tube 13 and the air inlet 24, and the limit frame 15 can support the electric heating tube 12.

[0031] The rear end of the connecting flange 14 is connected to the mixing tube 2, a coal inlet 21 is inserted and installed above the mixing tube 2, an oxygen inlet 22 is fixedly installed on the left side of the mixing tube 2, an end cover 23 is fixedly installed at the front end of the mixing tube 2, an air inlet 24 is inserted and installed below the end cover 23, and a connecting frame 25 is fixedly installed below the mixing tube 2.

[0032] The coal inlet 21 is installed above the mixing tube 2 at an inclination angle of thirty degrees. The coal inlet 21 is connected to the inner cavity of the mixing tube 2 . The inclination angle of the front end surface of the mixing tube 2 is consistent with the inclination angle of the coal inlet 21 .

[0033] The angle between the axis of the oxygen inlet 22 and the axis of the mixing tube 2 is thirty degrees. The oxygen inlet 22 is installed symmetrically on the upper left side and the lower right side of the mixing tube 2 with the center of the mixing tube 2 as the reference. The inner wall of the oxygen inlet 22 is tangent to the inner wall of the mixing tube 2.

[0034] The air inlet 24 and the end surface of the end cover 23 are perpendicular to each other. The air inlet 24 is connected to the connecting pipe 13 through the connecting flange 14. The air inlet 24 passes through the end cover 23 and is connected to the inner cavity of the mixing tube 2. The air inlet 24 points to the lower end of the coal inlet 21.

[0035] Specifically, the mixing tube 2 can limit the position of the airflow and the coal powder to facilitate the mixing and fluidization of the coal powder and the airflow, the coal inlet 21 can facilitate the coal powder to enter the interior of the mixing tube 2, the oxygen inlet 22 can facilitate the oxygen to enter the interior of the mixing tube 2, the end cover 23 can limit the position of the air inlet 24, the air inlet 24 can guide the airflow to blow toward the lower end of the coal inlet 21, and the connecting frame 25 can support the mixing tube 2.

[0036] When in use, the coal inlet 21 is installed above the mixing tube 2 at an inclination angle of thirty degrees, which can reduce the speed at which the coal powder falls. At the same time, the inclination angle of the front end face of the mixing tube 2 is consistent with the inclination angle of the coal inlet 21. The air inlet 24 and the end face of the end cover 23 are perpendicular to each other. The air inlet 24 is connected to the connecting pipe 13 through the connecting flange 14. The air inlet 24 passes through the end cover 23 and is connected to the inner cavity of the mixing tube 2. The air inlet 24 points to the lower end of the coal inlet 21. This method allows the coal powder to contact the airflow blown out of the air inlet 24 during the process of falling from the lower end of the coal inlet 21 into the mixing tube 2. Since the inner diameter of the air inlet 24 is smaller than the inner diameter of the mixing tube 2, the airflow will be discharged from the air inlet 24 at a higher flow rate, thereby blowing away the coal powder entering the mixing tube 2, so as to facilitate the fluidization of the coal powder and avoid the coal powder from being deposited below the coal inlet 21. At the same time, the angle between the axis of the oxygen inlet 22 and the axis of the mixing tube 2 is thirty degrees. The oxygen inlet 22 is installed at the upper left side and the lower right side of the mixing tube 2 in a mirror-symmetrical manner with the center of the mixing tube 2 as the reference. After passing through the oxygen inlet 22, the oxygen will move obliquely backward and, under the guidance of the inner wall of the mixing tube 2, generate a vortex rotating with the axis of the mixing tube 2 as the reference to facilitate the fluidization of the coal powder. The air outlet of the blower 1 is fixedly connected to the front end of the heating tube 11, and the electric heating tube 12 is installed in a ring shape on the inner wall of the heating tube 11 at an angle of forty-five degrees with the center of the heating tube 11 as the reference. The connecting pipe 13 is a rubber hose, and the front end of the connecting pipe 13 is connected to the heating tube 11. The connecting pipe 13 is connected to the blower 1 through the heating tube 11. The airflow generated by the blower 1 will be heated under the action of the electric heating tube 12 after passing through the inside of the heating tube 11, and then blown to the coal powder through the connecting pipe 13 and the air inlet 24. This method can make the coal powder drier and reduce the impact on the internal temperature of the blast furnace, so as to improve the combustion efficiency of the coal powder.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluidized conveying structure for a coal injection gun, characterized in that: include: A blower (1), a heating tube (11) is fixedly installed on the rear side of the blower (1), an air outlet of the blower (1) is fixedly connected to the front end of the heating tube (11), an electric heating tube (12) is fixedly installed inside the heating tube (11), the electric heating tube (12) is annularly installed on the inner wall of the heating tube (11) at an angle of forty-five degrees with the center of the heating tube (11) as a reference, a connecting tube (13) is fixedly installed on the rear end of the heating tube (11), a connecting flange (14) is fixedly installed on the rear end of the connecting tube (13), a limiting frame (15) is fixedly installed on the outer side of the heating tube (11), and the connecting flange (14) is fixedly installed on the outer side of the heating tube (11). 4) is connected to the rear end of the mixing tube (2), a coal inlet (21) is inserted and installed above the mixing tube (2), the coal inlet (21) is installed above the mixing tube (2) at an inclination angle of thirty degrees, the coal inlet (21) is connected to the inner cavity of the mixing tube (2), the inclination angle of the front end face of the mixing tube (2) is consistent with the inclination angle of the coal inlet (21), an oxygen inlet (22) is fixedly installed on the left side of the mixing tube (2), an end cover (23) is fixedly installed at the front end of the mixing tube (2), an air inlet (24) is inserted and installed below the end cover (23), and a connecting frame (25) is fixedly installed below the mixing tube (2).

2. A fluidized conveying structure for a coal injection gun according to claim 1, characterized in that: The connecting pipe (13) is a rubber hose, the front end of which is connected to the heating pipe (11), and the connecting pipe (13) is connected to the blower (1) via the heating pipe (11).

3. A fluidized conveying structure for a coal injection gun according to claim 1, characterized in that: The limiting frame (15) is symmetrically installed on the front and rear sides of the electric heating tube (12) with the center of the electric heating tube (12) as a reference, and the bottom end of the limiting frame (15) and the bottom end of the blower (1) are in the same plane.

4. A fluidized conveying structure for a coal injection gun according to claim 1, characterized in that: The angle between the axis of the oxygen inlet (22) and the axis of the mixing tube (2) is thirty degrees. The oxygen inlet (22) is installed at the upper left side and the lower right side of the mixing tube (2) in a mirror-symmetrical manner with the center of the mixing tube (2) as a reference. The inner wall of the oxygen inlet (22) is tangent to the inner wall of the mixing tube (2).

5. A fluidized conveying structure for a coal injection gun according to claim 1, characterized in that: The air inlet (24) and the end surface of the end cover (23) are perpendicular to each other. The air inlet (24) is connected to the connecting pipe (13) through the connecting flange (14). The air inlet (24) passes through the end cover (23) and is connected to the inner cavity of the mixing pipe (2). The air inlet (24) points to the lower end of the coal inlet (21).

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