Blast furnace pulverized coal injection device

Abstract

The utility model discloses a blast furnace pulverized coal injection device which comprises a straight blowing pipe and a coal injection gun, the output end of the coal injection gun is inserted into the straight blowing pipe, the axis of the coal injection gun is intersected with the axis of the straight blowing pipe, the blast furnace pulverized coal injection device further comprises an inclined blowing mechanism, the inclined blowing mechanism comprises an inclined blowing pipe, the inclined blowing pipe comprises an inclined blowing section, the output end of the inclined blowing section is inserted into the straight blowing pipe, and the output end of the inclined blowing section is inserted into the straight blowing pipe. The jet airflow track of the inclined blowing section intersects with the jet pulverized coal flow track of the coal injection gun, and the interval angle between the inclined blowing pipe and the coal injection gun pipe in the circumferential direction of the straight blowing pipe is 180 degrees. High-pressure gas is conveyed into the straight blowing pipe through the inclined blowing pipe and directly blown to pulverized coal flow, the jet flow track of the pulverized coal flow is adjusted and corrected, the situation that the pulverized coal flow directly scours the inner wall of the straight blowing pipe when being jetted out at a high speed is avoided, abrasion of the pulverized coal flow to the straight blowing pipe is weakened, and therefore the service life of the straight blowing pipe is prolonged. The high-pressure gas sprayed out of the inclined blowing pipe can promote the mixing effect of the pulverized coal and the air, so that the pulverized coal is uniformly mixed with the air in the straight blowing pipe, and the combustion effect of the sprayed coal is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace coal injection, in particular to a blast furnace coal powder injection device. Background Art

[0002] Blast furnace injection technology is to inject finely ground coal powder directly into the blast furnace to replace the scarce and expensive metallurgical coke, which acts as a heating agent and reducing agent, thereby reducing the coke ratio and pig iron cost. It is one of the most effective measures for steel companies to save coke, increase production and improve smelting technology. 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 ordinary coal injection guns and oxygen coal guns according to the different injection media. The coal injection medium of the ordinary coal injection gun is compressed air, and the oxygen coal gun uses oxygen as the medium.

[0003] According to the way the gun is inserted, the common coal spray gun is divided into three types: oblique insertion type, straight insertion type, and fixed air outlet type. Among them, the oblique insertion type coal spray gun includes a coal spray gun and a straight blow pipe. The coal spray gun is inserted from the straight blow pipe, and the center of the spray gun forms an angle with the center of the air outlet, which is generally 12°~14°. Most oblique insertion type spray guns are made of stainless steel seamless steel pipes, which can resist high temperature oxidation and coal powder wear. Its characteristics are short direct heating section, not easy to deform and burn, simple operation, and easy to move. It is a widely used gun type at present. However, when the coal powder flow is ejected at high speed, it is easy to directly scour the inner wall of the straight blow pipe, affecting the life of the straight blow pipe, so it is necessary to improve it.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0005] Based on this, it is necessary to provide a blast furnace pulverized coal injection device to address the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a blast furnace pulverized coal injection device, including a straight blowing pipe and a coal injection gun, the output end of the coal injection gun is inserted in the straight blowing pipe, the axis of the coal injection gun intersects with the axis of the straight blowing pipe, and also includes an oblique blowing mechanism, the oblique blowing mechanism includes at least one oblique blowing pipe, the oblique blowing pipe includes an oblique blowing section, the output end of the oblique blowing section is inserted in the straight blowing pipe, the trajectory of the oblique blowing section jetting air flow intersects with the trajectory of the coal powder jetting air flow of the coal injection gun, and the oblique blowing pipe and the coal injection gun pipe are spaced at an angle of 180 degrees in the circumferential direction of the straight blowing pipe.

[0007] Preferably, the oblique blowing section is arranged to intersect with the axis of the straight blowing pipe and the axis of the coal injection gun barrel, and the axis of the oblique blowing section, the axis of the straight blowing pipe and the axis of the coal injection gun barrel are all located on the same reference plane.

[0008] Preferably, a first check valve and a first regulating valve are installed on the coal injection gun.

[0009] Preferably, the oblique blowing mechanism further comprises a main pipeline, the main pipeline is connected to the oblique blowing pipe, and a second check valve and a second regulating valve are installed on the main pipeline.

[0010] Preferably, the oblique blowing pipe further includes a bending section, a third regulating valve is installed on the bending section, and the bending section is connected to the main pipeline.

[0011] Preferably, the angle between the axis of the coal injection gun tube and the straight blowing pipe is 12° to 30°.

[0012] Preferably, the angle between the oblique blowing section and the axis of the straight blowing pipe is 12°~30°.

[0013] Beneficial effects of this technical solution:

[0014] High-pressure gas is delivered to the straight blowing pipe through the oblique blowing pipe and blown directly to the pulverized coal flow, so as to adjust and correct the jet trajectory of the pulverized coal flow, thereby improving the effect of adjusting the angle of the pulverized coal flow, avoiding the pulverized coal flow from directly scouring the inner wall of the straight blowing pipe when it is ejected at high speed, reducing the wear of the pulverized coal flow on the straight blowing pipe, and thus improving the service life of the straight blowing pipe;

[0015] The high-pressure gas sprayed from the oblique blowpipe will promote the mixing effect of coal powder and air, so that the coal powder and air are evenly mixed in the straight blowpipe, thereby improving the combustion effect of coal injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 A side view of an embodiment of the utility model;

[0018] In the figure, 1, straight blowing pipe; 2, coal injection gun; 3, oblique blowing mechanism; 31, oblique blowing pipe; 311, oblique blowing section; 312, bending section; 32, main pipeline; 33, second check valve; 34, second regulating valve; 35, third regulating valve; 4, first regulating valve; 5, first check valve. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0020] See also Figure 1 and Figure 2The embodiment of the present application provides a blast furnace pulverized coal injection device, including a straight blowing pipe 1 and a coal injection gun 2, the output end of the coal injection gun 2 is inserted in the straight blowing pipe 1, the axis of the coal injection gun 2 intersects with the axis of the straight blowing pipe 1, and also includes an oblique blowing mechanism 3, the oblique blowing mechanism 3 includes three oblique blowing pipes 31, the three oblique blowing pipes 31 are arranged equidistantly, the oblique blowing pipe 31 includes an oblique blowing section 311, the output end of the oblique blowing section 311 is inserted in the straight blowing pipe 1, the trajectory of the jet air flow of the oblique blowing section 311 intersects with the trajectory of the pulverized coal jet flow of the coal injection gun 2, and the oblique blowing pipe 31 and the coal injection gun 2 are spaced at an angle of 180 degrees in the circumferential direction of the straight blowing pipe 1. Since the trajectory of the air flow ejected by the oblique blowing section 311 intersects with the trajectory of the coal powder flow ejected by the coal injection gun 2, the high-pressure gas discharged from the oblique blowing pipe 31 will directly blow toward the coal powder flow, thereby adjusting the jet trajectory of the coal powder flow, avoiding the coal powder flow from directly scouring the inner wall of the straight blowing pipe 1 when ejected at high speed, reducing the wear of the coal powder flow on the straight blowing pipe 1, and thus increasing the life of the straight blowing pipe 1.

[0021] In order to improve the adjustment effect of the pulverized coal flow, the oblique blowing section 311 is arranged to intersect with the axis of the straight blowing pipe 1 and the axis of the coal injection gun 2, and the axis of the oblique blowing section 311 and the axis of the straight blowing pipe 1 and the axis of the coal injection gun 2 are all located on the same reference plane. In this way, the high-pressure gas discharged from the oblique blowing pipe 31 is fully in contact with the pulverized coal flow.

[0022] To prevent gas from flowing back in the coal injection gun 2, a first check valve 5 is installed on the coal injection gun 2; to facilitate regulating the gas pulverized coal flow, a first regulating valve 4 is installed on the coal injection gun 2. The first regulating valve 4 is a manual ball valve.

[0023] In order to facilitate the supply of gas to the three oblique blowing pipes 31, the oblique blowing mechanism 3 is provided to further include a main pipeline 32, which is connected to the oblique blowing pipes 31, and a second check valve 33 and a second regulating valve 34 are installed on the main pipeline 32. The second check valve 33 can prevent the coal powder from flowing back in the main pipeline 32; the second regulating valve 34 is a manual regulating valve, and the flow rate of the gas supplied to the three oblique blowing pipes 31 can be adjusted by setting the second regulating valve 34.

[0024] In order to facilitate the main pipeline 32 to supply gas to the oblique blowing section 311, the oblique blowing pipe 31 also includes a bending section 312, the bending section 312 is connected to the oblique blowing, and a third regulating valve 35 is installed on the bending section 312, and the bending section 312 is connected to the main pipeline 32. Each oblique blowing pipe 31 is provided with a third regulating valve 35, and the third regulating valve 35 is a manual regulating valve. The third regulating valve 35 can be used to adjust the gas flow of each oblique blowing pipe 31, so as to accurately adjust the direction of the coal injection flow.

[0025] The angle between the coal injection gun 2 pipe and the axis of the straight blowing pipe 1 is 10°~30°, preferably 13° in this embodiment. The angle between the oblique blowing section 311 and the axis of the straight blowing pipe 1 is 10°~30°, preferably 13° in this embodiment. The larger the angle between the coal injection gun 2 pipe and the axis of the straight blowing pipe 1, the larger the angle between the oblique blowing section 311 and the axis of the straight blowing pipe 1 should be set accordingly, thereby improving the ability to offset the impact of the coal injection flow on the inner wall of the straight blowing pipe 1. When the angle between the coal injection gun 2 pipe and the axis of the straight blowing pipe 1 and the angle between the oblique blowing section 311 and the axis of the straight blowing pipe 1 are both set to 13°, the impact force of the coal injection gun 2 pipe on the inner wall of the straight blowing pipe 1 can be smaller, and the oblique blowing section 311 has a better ability to offset the impact of the coal injection flow on the inner wall of the straight blowing pipe 1, and it will not affect the flow rate of the coal injection flow too much, ensuring the high-speed ejection of the coal injection flow.

[0026] In this embodiment, a high-pressure combustion-supporting gas, such as air, hydrogen-rich gas or oxygen-rich gas, is introduced into the straight blowing pipe 1, and a high-pressure boosting gas, such as air, hydrogen-rich gas or nitrogen, is introduced into the oblique blowing pipe 31. The high-pressure combustion-supporting gas introduced into the straight blowing pipe 1 accelerates the coal powder sprayed out from the output end of the coal injection gun 2. Although the angle of the coal powder flow can be adjusted, the adjustment effect is general due to the small angle between the two. The coal powder will still impact the inner wall of the straight blowing pipe 1, causing wear of the inner wall of the straight blowing pipe 1. By setting an oblique blowing mechanism 3, high-pressure boosting gas is introduced into the oblique blowing pipe 31 to directly blow the coal powder flow. The angle between the trajectory of the high-pressure boosting gas and the coal powder flow is large, and the jet trajectory of the coal powder flow can be efficiently adjusted and corrected, thereby improving the effect of adjusting the angle of the coal powder flow. On the other hand, the high-pressure gas sprayed from the oblique blowing pipe 31 will also promote the mixing effect of coal powder and air, so that the coal powder and air are evenly mixed, thereby improving the combustion effect of coal injection.

[0027] It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these are all within the scope of protection of the utility model. Therefore, the scope of protection of the utility model patent shall be based on the attached claims.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A blast furnace coal powder injection device, comprising a direct blowing pipe (1) and a coal injection gun (2), wherein the output end of the coal injection gun (2) is inserted into the direct blowing pipe (1), and the axis of the coal injection gun (2) intersects with the axis of the direct blowing pipe (1), characterized in that: The invention also comprises an oblique blowing mechanism (3), wherein the oblique blowing mechanism (3) comprises at least one oblique blowing pipe (31), the oblique blowing pipe (31) comprising an oblique blowing section (311), the output end of the oblique blowing section (311) being inserted into the straight blowing pipe (1), the trajectory of the air flow injected by the oblique blowing section (311) intersecting with the trajectory of the coal powder flow injected by the coal injection gun (2), and the oblique blowing pipe (31) and the coal injection gun (2) being spaced at an angle of 180 degrees in the circumferential direction of the straight blowing pipe (1).

2. The blast furnace coal powder injection device according to claim 1, characterized in that: The oblique blowing section (311) is arranged to intersect with the axis of the straight blowing pipe (1) and the axis of the coal injection gun (2) pipe, and the axis of the oblique blowing section (311) and the axis of the straight blowing pipe (1) and the axis of the coal injection gun (2) pipe are all located on the same reference plane.

3. The blast furnace coal powder injection device according to claim 1, characterized in that: The coal injection gun (2) is provided with a first check valve (5) and a first regulating valve (4).

4. The blast furnace coal powder injection device according to claim 1, characterized in that: The oblique blowing mechanism (3) further comprises a main pipeline (32), the main pipeline (32) being in communication with the oblique blowing pipe (31), and a second check valve (33) and a second regulating valve (34) being installed on the main pipeline (32).

5. The blast furnace coal powder injection device according to claim 4, characterized in that: The oblique blowing pipe (31) further comprises a bending section (312), a third regulating valve (35) is installed on the bending section (312), and the bending section (312) is connected to the main pipeline (32).

6. The blast furnace pulverized coal injection device according to claim 1, characterized in that: The angle between the axis of the coal injection gun (2) tube and the axis of the direct blowing tube (1) is 12° to 30°.

7. The blast furnace coal powder injection device according to claim 1, characterized in that: The angle between the oblique blowing section (311) and the axis of the straight blowing pipe (1) is 12° to 30°.

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