Device for dredging blockage of coal injection pipeline of blast furnace

Abstract

The utility model provides a device for dredging blockage of a coal injection pipeline of a blast furnace, which comprises a gas source pipeline and a drainage pipeline, the coal injection pipeline is communicated with the gas source pipeline, a first valve is arranged on the gas source pipeline, and nitrogen can be filled into the coal injection pipeline through the gas source pipeline; one end of the drainage pipeline is communicated with the coal injection pipeline, the other end of the drainage pipeline is communicated with the powder return pipeline, a second valve is arranged at one end of the drainage pipeline, and a third valve is arranged at the other end of the drainage pipeline. According to the device, by utilizing the siphon backflow principle, the negative pressure formed by the pressure relief of the coal injection pipeline and the negative pressure of the powder return bin during the operation of the main exhaust fan are used for guiding the blocked coal powder in the coal injection pipeline to the powder return bin. The device is easy to manufacture and install, convenient to use, safe and environment-friendly, avoids high-altitude dangerous operation and coal powder leakage, and meanwhile greatly saves labor cost, crane and material cost, cost caused by coal stopping of a blast furnace and the like.

Description

Technical Field

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

[0002] Blast furnace coal injection is usually far away from the blast furnace, and the coal injection pipeline is long and high in the air. Coal powder is easy to accumulate in the coal injection pipeline and even block the coal injection pipeline.

[0003] Usually, a small number of purge points and relief points are set along the coal injection pipeline to dredge the coal injection pipeline, but the purge pipeline is small, the flow and pressure are insufficient. If blockage occurs, segmented backblowing and relief are required, including safety measures, environmental protection measures and dredging, which often takes more than 6 hours, long dredging time and poor dredging effect. When the blockage is serious, it needs to be dredged in sections, which takes about 7 days to recover. The workload is large, the risk is high, and it will cause environmental pollution, which cannot meet the requirements of safe, environmentally friendly and fast blockage treatment. Utility Model Content

[0004] The utility model aims to provide a device for clearing the blockage of a coal injection pipeline of a blast furnace. The device utilizes the siphon reflux principle to drain the blocked coal powder in the coal injection pipeline to the powder return bin through the negative pressure formed by the pressure relief of the coal injection pipeline.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for clearing the blockage of a blast furnace coal injection pipeline, the device can

[0007] The coal powder blocked in the coal injection pipeline is drained to the powder return bin through the powder return pipeline, and the device includes an air source pipeline and a drainage pipeline, wherein the coal injection pipeline is connected with the air source pipeline, and a first valve is arranged on the air source pipeline, and nitrogen can be filled into the coal injection pipeline through the air source pipeline; one end of the drainage pipeline is connected with the coal injection pipeline, and the other end of the drainage pipeline is connected with the powder return pipeline, a second valve is arranged at one end of the drainage pipeline, and a third valve is arranged at the other end of the drainage pipeline.

[0008] Furthermore, in the device for unblocking a coal injection pipeline in a blast furnace, the pressure of nitrogen gas filled into the coal injection pipeline through the gas source pipeline is 1.0 MPa.

[0009] Furthermore, in the device for unblocking a coal injection pipeline in a blast furnace, a purge joint is provided on the coal injection pipeline, and the gas source pipeline is connected to the coal injection pipeline through the purge joint.

[0010] Furthermore, in the device for unblocking a coal injection pipeline in a blast furnace, a check valve is provided on the gas source pipeline, and compared with the first valve, the check valve is far away from the coal injection pipeline.

[0011] Furthermore, in the device for unblocking a coal injection pipeline of a blast furnace, the drainage pipeline is made of a metal hose with a diameter of 50 mm.

[0012] Furthermore, in the device for unblocking a coal injection pipeline in a blast furnace, one end of the second valve is connected to the drainage pipeline via a quick connector, and one end of the third valve is connected to the drainage pipeline via a quick connector.

[0013] Furthermore, in the device for unblocking a blockage in a blast furnace coal injection pipeline, the quick connector is a φ50mm quick connector.

[0014] Furthermore, in the device for unblocking a coal injection pipeline in a blast furnace, a first vent pipe is provided on the coal injection pipeline, the other end of the second valve is connected to the coal injection pipeline through the first vent pipe, a second vent pipe is provided on the powder return pipeline, and the third valve is connected to the powder return pipeline through the second vent pipe.

[0015] Furthermore, in the device for unblocking a blockage in a blast furnace coal injection pipeline, the first valve, the second valve and the third valve are all DN50 manual ball valves or pneumatic ball valves.

[0016] It can be seen from the analysis that the utility model discloses a device for unblocking the coal injection pipeline of a blast furnace. The device is used to unblock the coal injection pipeline, which improves the traditional segmented blowing and venting method used when the coal injection pipeline of the blast furnace is blocked. The siphon reflux principle, the negative pressure formed by the pressure relief of the coal injection pipeline, and the negative pressure of the return powder bin when the main exhaust fan is running are used to drain the blocked coal powder in the coal injection pipeline to the return powder bin. The device is simple to manufacture and install, and easy to use. The components can be installed and the pipelines can be connected when the blast furnace is shut down. The operation is simple and convenient, and only one person is required to operate it. The blockage can be handled safely, environmentally and quickly within 30 minutes, and the normal coal injection of the blast furnace can be quickly restored. It avoids dangerous operations at high altitudes and coal powder leakage, is safe and environmentally friendly, and at the same time greatly saves labor costs, crane and material costs, and costs caused by stopping the blast furnace from coaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0019] Explanation of reference numerals: 1 gas source pipeline; 2 drainage pipeline; 3 powder return pipeline; 4 first valve; 5 second valve; 6 third valve; 7 purge joint; 8 check valve; 9 quick joint; 10 first vent pipe; 11 second vent pipe; 12 coal injection pipeline. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0021] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] One or more examples of the utility model are shown in the attached drawings. The detailed description uses numbers and letters to refer to the features in the drawings. Similar or similar marks in the drawings and descriptions have been used to refer to similar or similar parts of the utility model. As used herein, the terms "first", "second", and "third" etc. are used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of individual components.

[0023] like Figure 1As shown, according to an embodiment of the utility model, a device for unblocking a coal injection pipeline of a blast furnace is provided, the device can drain the coal powder blocked in the coal injection pipeline 12 to the powder return bin through the powder return pipeline 3, the device comprises an air source pipeline 1 and a drainage pipeline 2, wherein the coal injection pipeline 12 is connected to the air source pipeline 1, a first valve 4 is arranged on the air source pipeline 1, and nitrogen can be filled into the coal injection pipeline 12 through the air source pipeline 1; one end of the drainage pipeline 2 is connected to the coal injection pipeline 12, and the other end of the drainage pipeline 2 is connected to the powder return pipeline 3, a second valve 5 is arranged at one end of the drainage pipeline 2, and a third valve 6 is arranged at the other end of the drainage pipeline 2. When the coal injection pipeline 12 is blocked, the second valve 5 and the third valve 6 are closed, the first valve 4 is opened, and high-pressure nitrogen is filled into the coal injection pipeline 12 using the gas source pipeline 1. The high-pressure nitrogen loosens the coal powder blocked in the coal injection pipeline 12. After the coal injection pipeline 12 is filled with nitrogen and there is no air flow, the first valve 4 is closed, the second valve 5 and the third valve 6 are opened, and the coal injection pipeline 12 is depressurized to the powder return pipeline 3 through the drainage pipeline 2. When the main exhaust fan is running, the negative pressure of the powder return bin drains the coal powder blocked in the coal injection pipeline 12 through the drainage pipeline 2 and the powder return pipeline 3 to the powder return bin in turn.

[0024] Furthermore, the pressure of nitrogen filled into the coal injection pipeline 12 through the gas source pipeline 1 is 1.0 MPa.

[0025] Furthermore, a purge joint 7 is provided on the coal injection pipeline 12 , and the gas source pipeline 1 is connected to the coal injection pipeline 12 via the purge joint 7 .

[0026] Furthermore, a check valve 8 is provided on the gas source pipeline 1. Compared with the first valve 4, the check valve 8 is far away from the coal injection pipeline 12. The check valve 8 can prevent nitrogen from flowing back.

[0027] Furthermore, the drainage pipe 2 is made of a metal hose with a diameter of 50 mm. In the process of coal powder reflux, the drainage pipe 2 made of the metal hose can be seen to have obvious pulsation. When there is no gas and powder flowing in the drainage pipe 2, the dredging operation is repeated until all blockages are dredged to ensure the dredging effect.

[0028] Further, one end of the second valve 5 is connected to the drainage pipe 2 through a quick connector 9, and one end of the third valve 6 is connected to the drainage pipe 2 through a quick connector 9. The quick connector 9 is a φ50mm quick connector 9. Such an arrangement can facilitate installation or maintenance of the drainage pipe 2.

[0029] Furthermore, a first vent pipe 10 is provided on the coal injection pipeline 12, and the other end of the second valve 5 is connected to the coal injection pipeline 12 through the first vent pipe 10. A second vent pipe 11 is provided on the powder return pipeline 3, and the third valve 6 is connected to the powder return pipeline 3 through the second vent pipe 11. Such a setting facilitates the installation and maintenance of the device.

[0030] Furthermore, the first valve 4, the second valve 5 and the third valve 6 are all DN50 manual ball valves. The first valve 4, the second valve 5 and the third valve 6 can also be pneumatic ball valves, which are connected to the central control room and operated in the central control room to judge the dredging status according to the pipeline pressure and the weight change of the powder return bin.

[0031] The device can also be used to clear coal injection branch pipes, spray guns and other pipes blocked by materials.

[0032] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0033] A device for unblocking a coal injection pipeline of a blast furnace is used to unblock the coal injection pipeline 12, which improves the traditional segmented purging and release method used when the coal injection pipeline 12 of the blast furnace is blocked. The siphon reflux principle is used, and the negative pressure formed by the pressure relief of the coal injection pipeline 12 and the negative pressure of the powder return bin when the main exhaust fan is running are used to drain the blocked coal powder in the coal injection pipeline 12 to the powder return bin. The device is simple to manufacture and install, and is easy to use. The components can be installed and the pipelines can be connected during the blast furnace shutdown. The operation is simple and convenient, and only one person is required to operate it. The blockage can be handled safely, environmentally and quickly within 30 minutes, and the normal coal injection of the blast furnace can be quickly restored. It avoids dangerous operations at high altitudes and coal powder leakage, is safe and environmentally friendly, and at the same time greatly saves labor costs, crane and material costs, and costs caused by blast furnace coal shutdown.

[0034] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A device for clearing the blockage of a coal injection pipeline of a blast furnace, the device can drain the coal powder blocked in the coal injection pipeline to the coal powder return bin through the coal powder return pipeline, characterized in that: The device comprises an air source pipeline and a drainage pipeline, wherein: The coal injection pipeline is connected to a gas source pipeline, and a first valve is provided on the gas source pipeline, through which nitrogen can be filled into the coal injection pipeline; One end of the drainage pipe is connected to the coal injection pipe, and the other end of the drainage pipe is connected to the powder return pipe. A second valve is arranged at one end of the drainage pipe, and a third valve is arranged at the other end of the drainage pipe.

2. The device for clearing blockage of coal injection pipeline of blast furnace according to claim 1, characterized in that: The pressure of nitrogen filled into the coal injection pipeline through the gas source pipeline is 1.0 MPa.

3. The device for clearing blockage of coal injection pipeline in blast furnace according to claim 1, characterized in that: The coal injection pipeline is provided with a purge joint, and the gas source pipeline is communicated with the coal injection pipeline through the purge joint.

4. The device for clearing blockage of coal injection pipeline of blast furnace according to claim 1, characterized in that: A check valve is arranged on the gas source pipeline. Compared with the first valve, the check valve is far away from the coal injection pipeline.

5. The device for clearing blockage of coal injection pipeline in blast furnace according to claim 1, characterized in that: The drainage pipe is made of a metal hose with a diameter of 50 mm.

6. The device for clearing blockage of coal injection pipeline in blast furnace according to claim 1, characterized in that: One end of the second valve is connected to the drainage pipe through a quick connector. One end of the third valve is communicated with the drainage pipeline through a quick connector.

7. The device for clearing blockage of coal injection pipeline of blast furnace according to claim 6, characterized in that: The quick connector is a φ50mm quick connector.

8. The device for clearing blockage of coal injection pipeline in blast furnace according to claim 1, characterized in that: A first vent pipe is provided on the coal injection pipeline, and the other end of the second valve is connected to the coal injection pipeline through the first vent pipe. A second venting pipe is provided on the powder return pipe, and the third valve is communicated with the powder return pipe through the second venting pipe.

9. The device for clearing blockage of coal injection pipeline in blast furnace according to claim 1, characterized in that: The first valve, the second valve and the third valve are all DN50 manual ball valves or pneumatic ball valves.

Images