Nitrogen recovery device for pulverized coal injection

Abstract

The utility model discloses a kind of nitrogen recovery devices for coal powder injection, including gas supply pipeline, three pressure-charging valves are installed on the gas supply pipeline, nitrogen tank is connected to the pressure-charging valve outlet end, injection valve is installed on the nitrogen tank, injection pipeline is equipped on the gas supply pipeline side, the injection valve outlet end is connected with injection pipeline, regulating valve is installed on the nitrogen tank, three regulating valves are connected by connecting pipeline, drive frame is installed on the connecting pipeline, the specified regulating valve can be opened and closed by the drive frame.The beneficial effects of the utility model are that the device can alternately spray, recover and fill three nitrogen tanks, which can facilitate nitrogen recovery, reduce costs, and also improve the addition efficiency of coal powder.

Description

Technical Field

[0001] This utility model relates to the technical field of blast furnace ironmaking equipment, and more specifically, to a nitrogen recovery device for pulverized coal injection. Background Technology

[0002] The steel industry is currently facing multiple pressures, including capacity upgrading, green transformation, and market competition. In industrial production, the amount of nitrogen used in injection tanks is large. By placing pulverized coal in the injection tank, filling it with nitrogen, and then releasing the nitrogen, the pulverized coal can be added to the blast furnace through the flow of nitrogen.

[0003] In the existing technology, in order to ensure that all the coal powder is blown out, an excessive amount of nitrogen is placed in the injection tank. As a result, after the coal powder is blown out of the injection tank, some nitrogen often remains in the injection tank. The nitrogen needs to be completely discharged before new coal powder can be added to the injection tank, which will cause nitrogen waste. Utility Model Content

[0004] The purpose of this invention is to solve the problem of nitrogen waste when adding pulverized coal, and to design a nitrogen recovery device for pulverized coal injection.

[0005] To achieve the above objectives, the technical solution of this utility model is a nitrogen recovery device for pulverized coal injection, comprising a gas supply pipeline, three pressurization valves installed on the gas supply pipeline, a nitrogen tank connected to the outlet end of each pressurization valve, a jet valve installed on the nitrogen tank, a jet pipe provided on one side of the gas supply pipeline, the outlet end of each jet valve connected to the jet pipe, a regulating valve installed on the nitrogen tank, the three regulating valves connected by a connecting pipeline, a drive frame installed on the connecting pipeline, and the drive frame capable of opening and closing designated regulating valves.

[0006] Furthermore, the drive frame includes three control buttons mounted on the connecting pipe. The three control buttons can control the opening and closing of three regulating valves respectively. An electric telescopic rod mounted on the connecting pipe is provided on one side of the control buttons, and a pressing rod is installed at the telescopic end of the electric telescopic rod.

[0007] Furthermore, a storage tank is installed on one side of the connecting pipe, a suction pump is installed at the upper end of the storage tank, the outlet end of the suction pump is connected to the storage tank through a vent pipe, an air exchange valve is installed at the upper end of the connecting pipe, and the suction pump is connected to the air exchange valve through a suction pipe.

[0008] Furthermore, the nitrogen tank is equipped with a pressure sensor and a coal charging valve.

[0009] The beneficial effects of this utility model are as follows: It is equipped with three nitrogen tanks, each filled with pulverized coal. One tank serves as the main injection tank, one as a backup injection tank, and one as a recovery tank. After the main injection tank sprays out pulverized coal, opening the corresponding regulating valve allows the nitrogen in the main injection tank to enter the recovery tank, thus recovering some of the nitrogen and reducing waste. After the nitrogen in the main injection tank is discharged, pulverized coal is added, and nitrogen is filled into the recovery tank. During this process, pulverized coal can be sprayed through the backup injection tank, improving work efficiency. After the pulverized coal in the backup injection tank is blown out, opening the corresponding regulating valve allows the nitrogen in the backup injection tank to enter the main injection tank. This process is repeated, allowing the three nitrogen tanks to alternately perform spraying, recovery, and filling operations, facilitating nitrogen recovery, reducing costs, and improving the efficiency of pulverized coal addition. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a nitrogen recovery device for pulverized coal injection according to the present invention; In the diagram, 1. Gas supply pipeline; 2. Pressurization valve; 3. Nitrogen tank; 4. Purge valve; 5. Purge pipeline; 6. Regulating valve; 7. Connecting pipeline; 8. Drive frame; 9. Control button; 10. Electric telescopic rod; 11. Pressing rod; 12. Storage tank; 13. Suction pump; 14. Air exchange valve; 15. Air pressure sensor; 16. Coal charging valve. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0012] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0013] This utility model provides, for example Figure 1 The nitrogen recovery device for pulverized coal injection shown includes a gas supply pipeline 1, three pressurization valves 2 installed on the gas supply pipeline 1, a nitrogen tank 3 connected to the outlet end of the pressurization valves 2, a blow-off valve 4 installed on the nitrogen tank 3, a blow-off pipeline 5 provided on one side of the gas supply pipeline 1, the outlet end of the blow-off valve 4 connected to the blow-off pipeline 5, a regulating valve 6 installed on the nitrogen tank 3, the three regulating valves 6 connected by a connecting pipeline 7, a drive frame 8 installed on the connecting pipeline 7, and the drive frame 8 can open and close the specified regulating valve 6.

[0014] The protection process for the electrical components of this device is as follows: First, pulverized coal is filled into three nitrogen cylinders 3, and the three nitrogen cylinders 3 are respectively designated as the main injection cylinder, the standby injection cylinder, and the recovery cylinder. Then, nitrogen is added to the main injection cylinder and the standby injection cylinder through the gas supply pipe 1 and the pressurization valve 2. Then, the pressurization valve 2 is closed. When it is necessary to add pulverized coal to the blast furnace, the injection valve 4 on the main injection cylinder is opened first, allowing the nitrogen and pulverized coal in the main injection cylinder to enter the injection pipe 5, thus allowing the addition of pulverized coal. Then, the injection valve 4 is closed, and the regulating valve 6 of the main injection cylinder and the recovery cylinder is opened through the drive frame 8. Since the gas pressure in the main injection cylinder is greater than the gas pressure in the recovery cylinder, it can... Nitrogen gas from the main injection tank enters the recovery tank through connecting pipe 7, facilitating nitrogen recovery. Once the pressure in the main injection tank and the recovery tank is balanced, the regulating valve 6 is closed via the drive frame 8. After the residual nitrogen in the main injection tank is discharged, pulverized coal is added. The pressurization valve 2 on the recovery tank is opened to add nitrogen, completing the cycle of pressurization, injection, recovery, depressurization, pulverized coal replenishment, and repressurization. At this point, the original main injection tank becomes the recovery tank, the original standby injection tank becomes the main injection tank, and the original recovery tank becomes the standby injection tank. The above process is repeated to facilitate pulverized coal injection and nitrogen recovery.

[0015] Refer to the instruction manual appendix Figure 1 The drive frame 8 includes three control buttons 9 installed on the connecting pipe 7. The three control buttons 9 can control the opening and closing of three regulating valves 6 respectively. An electric telescopic rod 10 installed on the connecting pipe 7 is provided on one side of the control button 9. A pressing rod 11 is installed at the telescopic end of the electric telescopic rod 10.

[0016] The process of the drive frame 8 opening and closing the designated regulating valve 6 is as follows: Activate the electric telescopic rod 10 to shorten it. The electric telescopic rod 10 can drive the pressing rod 11 to press the control button 9. Through the electrical connection between the control button 9 and the regulating valve 6, the designated regulating valve 6 can be opened. Activate the electric telescopic rod 10 to extend it. The electric telescopic rod 10 can drive the pressing rod 11 away from the control button 9. The control button 9 automatically resets. Then, through the electrical connection between the control button 9 and the regulating valve 6, the regulating valve 6 can be closed.

[0017] Refer to the instruction manual appendix Figure 1A storage tank 12 is installed on one side of the connecting pipe 7. A suction pump 13 is installed on the upper end of the storage tank 12. The outlet end of the suction pump 13 is connected to the storage tank 12 through a vent pipe. A ventilation valve 14 is installed on the upper end of the connecting pipe 7. The suction pump 13 is connected to the ventilation valve 14 through a suction pipe. After the nitrogen in the main injection tank is recovered, a small amount of nitrogen remains inside. At this time, the ventilation valve 14 and the regulating valve 6 on the main injection tank are opened, and the suction pump 13 is started. The suction pump 13 can drain the nitrogen from the connecting pipe 7 and the main injection tank through the suction pipe. The residual nitrogen is extracted into storage tank 12. After extraction, the regulating valve 6 and the ventilation valve 14 are closed, and then pulverized coal is added into the main injection tank. After the addition is completed, the regulating valve 6 on this nitrogen tank 3 and the next nitrogen tank 3 after pulverized coal injection is opened to recover the nitrogen. Then the regulating valve 6 is closed, the ventilation valve 14 and the regulating valve 6 on this nitrogen tank 3 are opened, and the suction pump 13 is started to run in reverse. This allows the nitrogen in storage tank 12 to be added to the original nitrogen tank 3, which can reduce nitrogen waste and save costs.

[0018] Refer to the instruction manual appendix Figure 1 The nitrogen tank 3 is equipped with a pressure sensor 15 and a coal charging valve 16. The pressure sensor 15 can detect the internal pressure of the nitrogen tank 3. When the internal pressure of the nitrogen tank 3 is at normal pressure, the coal charging valve 16 can be opened to facilitate the addition of coal powder into the nitrogen tank 3.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nitrogen recovery device for pulverized coal injection, comprising a gas supply pipeline (1), characterized in that, Three pressurizing valves (2) are installed on the gas supply pipeline (1). The outlet end of the pressurizing valve (2) is connected to a nitrogen tank (3). A blow valve (4) is installed on the nitrogen tank (3). A blow pipe (5) is provided on one side of the gas supply pipeline (1). The outlet end of the blow valve (4) is connected to the blow pipe (5). A regulating valve (6) is installed on the nitrogen tank (3). The three regulating valves (6) are connected by a connecting pipe (7). A drive frame (8) is installed on the connecting pipe (7). The drive frame (8) can open and close the specified regulating valve (6).

2. The nitrogen recovery device for pulverized coal injection according to claim 1, characterized in that, The drive frame (8) includes three control buttons (9) installed on the connecting pipe (7). The three control buttons (9) can control the opening and closing of three regulating valves (6) respectively. An electric telescopic rod (10) is installed on one side of the control button (9) on the connecting pipe (7). A pressing rod (11) is installed at the telescopic end of the electric telescopic rod (10).

3. A nitrogen recovery device for pulverized coal injection according to claim 1, characterized in that, A storage tank (12) is installed on one side of the connecting pipe (7). A suction pump (13) is installed at the upper end of the storage tank (12). The outlet end of the suction pump (13) is connected to the storage tank (12) through a vent pipe. An air exchange valve (14) is installed at the upper end of the connecting pipe (7). The suction pump (13) is connected to the air exchange valve (14) through a suction pipe.

4. A nitrogen recovery device for pulverized coal injection according to claim 3, characterized in that, The nitrogen tank (3) is equipped with a pressure sensor (15) and a coal charging valve (16).

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