Emergency continuous injection device for coal injection pipeline

Abstract

This utility model discloses an emergency continuous pulverized coal injection device for blast furnace pulverized coal injection pipelines. It includes main injection pipelines #1 and #2, and several injection tanks connected to these pipelines. Flexible connecting pipes are installed on the pipelines connecting the injection tanks to the main injection pipelines. A pulverized coal intelligent regulating valve is installed at the upper end of each flexible connecting pipe, and a pulverized coal shut-off valve is installed at the lower end of each flexible connecting pipe. An emergency pipeline is installed between the #3 injection tank (closest to the #2 injection pipeline and connected to the #1 injection pipeline) and the #2 injection pipeline. The emergency pipeline is located at the lower end of the flexible connecting pipes. A first manual valve, a gas replenishment manual valve, and a second manual valve are sequentially installed on the emergency pipeline. A manual valve for the #2 pipeline is installed at the front end of the connection between the #2 injection pipeline and the emergency pipeline. This utility model eliminates blast furnace pulverized coal injection shutdowns caused by damage to flexible connecting pipes, pipelines, or valves, ensuring uninterrupted pulverized coal injection into the blast furnace.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace pulverized coal technology, and in particular to an emergency continuous pulverized coal injection device for pulverized coal pipelines. Background Technology

[0002] In the blast furnace pulverized coal injection system, the connection between the injection tank (also known as the pulverized coal tank or injection tank) and the main injection pipeline is one of the core links in the entire injection process. Its design must ensure that the pulverized coal is transported stably, continuously, controllably and safely from the tank to the blast furnace tuyeres.

[0003] The bottom of the pulverized coal injection tank is typically designed in a conical or streamlined shape to facilitate the flow of pulverized coal towards the outlet under gravity and prevent bridging. A critical valve is installed at the outlet, which is the first step in connecting to the main pipeline. The upper ball valve (or upper gate valve, upper slide gate valve) is the main isolation valve. When the injection tank needs to stop injection (such as for maintenance, replacement, or pressure relief), the upper ball valve closes, completely isolating the injection tank from the downstream system. The intermediate connecting short pipe is a short pipe section (usually a metal flexible hose) connecting the upper and lower valves. The lower ball valve (or lower gate valve, lower slide gate valve) is located below the upper ball valve. During normal injection, both the upper and lower ball valves are usually open. Their main function is to close the lower ball valve for isolation when maintenance or replacement of the feeder (mixer) located below it is required, without affecting the injection tank itself. It also provides additional safety assurance. The feeder (mixer) is the core component of the connection, located below the lower ball valve. Its function is to uniformly mix pulverized coal with the conveying gas (carrier gas, usually nitrogen or compressed air) to form a stable gas-solid two-phase flow, which is then sent into the main injection pipeline.

[0004] The main injection pipeline is a main pipe that extends from the injection tank group area to the annular distributor around the blast furnace body, and is directly connected to the outlet of the feeder (mixer). The main pipeline is usually made of wear-resistant steel pipe (such as ceramic-lined steel pipe or wear-resistant alloy steel pipe) to withstand the scouring of high-speed pulverized coal particles. Near the feeder outlet on the main pipeline, supplementary conveying gas (carrier gas) is usually connected to regulate the total carrier gas volume and conveying speed, ensuring that the pulverized coal is stably suspended and conveyed in the pipeline and preventing sedimentation and blockage.

[0005] Currently, in the process of pulverized coal injection into blast furnaces, fixed injection tanks are required to continuously supply pulverized coal to the blast furnace. The metal hoses between the injection tanks and the main injection pipeline are prone to wear and tear, such as leakage and cracking, due to the wear of pulverized coal and high-pressure gas. When the metal hoses are damaged, the blast furnace must be shut down for coal and air supply before repair and replacement can be carried out, which is a technical challenge for the stable operation of the blast furnace.

[0006] In the existing technology, each blast furnace is equipped with three injection tanks to continuously circulate pulverized coal to the blast furnace. If any of the metal hoses, pipes, or valves at the bottom of the injection tanks are damaged, the blast furnace will need to be shut down for coal and air supply before repairs and replacements can be carried out. This will prevent the normal supply of pulverized coal to the blast furnace, thereby affecting the normal production of the blast furnace.

[0007] Therefore, it is necessary to design an emergency continuous pulverized coal injection device for pulverized coal pipelines, which can use the injection tanks of two blast furnaces to transport pulverized coal to each other, while neither blast furnace needs to stop injecting pulverized coal and can carry out maintenance and replacement. Utility Model Content

[0008] The technical problem this utility model aims to solve is to provide an emergency continuous pulverized coal injection device for pulverized coal pipelines, which prevents blast furnace operation from being affected by blast furnace coal shutdown due to metal hose, pipeline damage, or valve body damage. It can use the injection tanks of two blast furnaces to mutually transport pulverized coal, and at the same time, neither blast furnace needs to stop injecting pulverized coal, and maintenance and replacement can be carried out, ensuring uninterrupted injection of pulverized coal into the blast furnace, guaranteeing the pulverized coal injection volume requirement of the blast furnace, and improving the stability of the blast furnace condition.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] An emergency continuous pulverization device for pulverized coal pipelines includes a No. 1 pulverization main pipeline, several pulverization tanks connected to the No. 1 pulverization main pipeline, a No. 2 pulverization main pipeline, and several pulverization tanks connected to the No. 2 pulverization main pipeline. Flexible connecting pipes are installed on the pipelines connecting the pulverization tanks to the pulverization main pipelines, and intelligent coal powder regulating valves are installed at the upper ends of the flexible connecting pipes. Coal powder shut-off valves are installed at the lower ends of the flexible connecting pipes. An emergency pipeline is installed between the No. 3 pulverization tank (closest to the No. 2 pulverization main pipeline) connected to the No. 1 pulverization main pipeline and the No. 2 pulverization main pipeline. The emergency pipeline is located at the lower end of the flexible connecting pipes and above the coal powder shut-off valves. A first manual valve, a gas replenishment manual valve, and a second manual valve are sequentially installed on the emergency pipeline. A No. 2 pipeline manual valve is installed at the front end of the connection between the No. 2 pulverization main pipeline and the emergency pipeline.

[0011] A further improvement of this utility model is that both the first manual valve and the second manual valve are DN100 manual ball valves.

[0012] A further improvement of this utility model is that the manual gas replenishment valve is connected to an inert gas replenishment pipeline.

[0013] A further improvement of this utility model is that the manual valve of the No. 2 pipeline is a DN65 manual ball valve.

[0014] A further improvement of this utility model is that the flexible connecting pipe is a metal corrugated flexible hose.

[0015] A further improvement of this utility model is that the emergency pipeline is welded between the No. 3 spray tank and the No. 2 spray main pipeline.

[0016] A further improvement of this utility model is that the diameter of the emergency pipeline is 1 / 3 to 1 / 2 of the diameter of the No. 2 jetting main pipeline.

[0017] A further improvement of this utility model is that the angle between the emergency pipeline and the horizontal plane is 30° to 60°.

[0018] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0019] 1. This utility model, by adding an emergency pipeline and configuring a manual valve group and a gas replenishment device, enables the mutual transportation of pulverized coal between the injection tanks of two blast furnaces. At the same time, neither blast furnace needs to stop injecting pulverized coal, and maintenance and replacement can be carried out. This ensures continuous injection of pulverized coal, avoids the risk of blast furnace coal shortage, and guarantees the stability of production.

[0020] 2. This utility model solves the problem of production stoppage caused by single-pipe failure in traditional injection systems through emergency pipeline design and key valve group optimization. At the same time, through gas replenishment regulation and rigid welding structure, it takes into account both the continuity and safety of pulverized coal transportation, and is suitable for harsh industrial scenarios such as blast furnace smelting.

[0021] 3. This utility model uses DN100 manual ball valve and DN65 manual ball valve as key shut-off components, combined with the flexible connection of metal hose, to effectively absorb pipeline vibration, reduce leakage risk, enhance system sealing and safety, and facilitate maintenance and operation.

[0022] 4. In this utility model, the emergency pipeline is fixed between the No. 3 spray tank and the No. 2 spray main pipeline by welding, avoiding the loosening or powder leakage problems that may occur in the flange connection, and is suitable for high pressure and high dust conditions.

[0023] 5. This utility model has a simple and reliable structure and low maintenance cost. The entire emergency system mainly relies on manual valves (ball valves). Manual valves have a simple structure, reliable operation, low failure rate, convenient maintenance and low cost, making them particularly suitable for scenarios that require rapid response in emergency situations.

[0024] 6. This utility model can utilize existing facilities, and after modification, stabilizes the operation and ensures smooth and high production of the blast furnace. It is a simple and convenient facility for injecting pulverized coal in the injection system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an emergency continuous pulverization device for a pulverized coal pipeline provided in an embodiment of this utility model;

[0027] Among them, 1 and 3# injection tanks; 2. 1# injection main pipeline; 3. 2# injection main pipeline; 3-1 and 2# pipeline manual valves; 4. emergency pipeline; 4-1, first manual valve; 4-2, gas replenishment manual valve; 4-3, second manual valve; 5. flexible connection pipe; 5-1, pulverized coal shut-off valve; 5-2, pulverized coal intelligent regulating valve. Detailed Implementation

[0028] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0031] like Figure 1As shown, an emergency continuous pulverized coal injection device includes a No. 1 pulverized coal injection main pipeline 2, several injection tanks (generally three, namely No. 1 injection tank, No. 2 injection tank, and No. 3 injection tank, responsible for supplying coal to No. 1 blast furnace) connected to the No. 1 pulverized coal injection main pipeline 2, a No. 2 pulverized coal injection main pipeline 3, and several injection tanks (generally three, namely No. 1 injection tank, No. 2 injection tank, and No. 3 injection tank, responsible for supplying coal to No. 2 blast furnace) connected to the No. 2 pulverized coal injection main pipeline 3; flexible connecting pipes 5 are installed on the pipelines connecting the injection tanks to the pulverized coal injection main pipeline, and at the upper end of the flexible connecting pipes 5... A pulverized coal intelligent regulating valve 5-2 is installed; a pulverized coal shut-off valve 5-1 is installed at the lower end of each flexible connecting pipe 5; an emergency pipeline 4 is installed between the No. 3 injection tank 1, which is closest to the No. 2 injection main pipeline 3 and connected to the No. 1 injection main pipeline 2, and the No. 2 injection main pipeline 3; the emergency pipeline 4 is located at the lower end of the flexible connecting pipe 5 and above the pulverized coal shut-off valve 5-1; a first manual valve 4-1, a gas replenishment manual valve 4-2, and a second manual valve 4-3 are installed sequentially on the emergency pipeline 4; a No. 2 pipeline manual valve 3-1 is installed at the front end of the connection between the No. 2 injection main pipeline 3 and the emergency pipeline 4.

[0032] Specifically, if any of the three injection tanks connected to the No. 2 injection main line 3 malfunctions due to damage to the metal hose, pipe, or valve body, forcing the No. 2 blast furnace to interrupt its coal supply, the on-site operators will quickly switch to emergency measures. They will rapidly connect the No. 3 injection tank (selected based on the actual site conditions) connected to the No. 1 injection main line 2, which is closest to the No. 2 injection main line, to the No. 2 injection main line 3. This will ensure the coal supply from the No. 2 injection main line 3 to the No. 2 blast furnace (since the No. 1 blast furnace is also being supplied with coal by two other injection tanks, this will not affect the coal supply to the No. 1 blast furnace). Similarly, if any of the injection tanks connected to the No. 1 injection main pipeline 2 malfunctions due to damage to the metal hose, pipe, or valve body, and the No. 1 blast furnace has to be shut off from coal supply, the on-site operators can also use emergency measures to quickly switch to the injection tanks connected to the No. 2 injection main pipeline 3 that are closest to the No. 1 injection main pipeline 2 (selected according to the actual situation on site) to the No. 1 injection main pipeline 2, so as to ensure the coal supply from the No. 1 injection main pipeline 2 to the No. 1 blast furnace (since the No. 2 blast furnace also has two other injection tanks supplying coal, it will not affect the coal supply of the No. 2 blast furnace).

[0033] Furthermore, both the first manual valve 4-1 and the second manual valve 4-3 are DN100 manual ball valves. The arrangement of the first manual valve 4-1 and the second manual valve 4-3 forms a reliable double isolation, ensuring that the emergency pipeline 4 is completely isolated from the No. 2 jetting main pipeline 3 in non-emergency situations, preventing cross-contamination or misoperation.

[0034] Furthermore, the manual gas replenishment valve 4-2 is connected to an inert gas replenishment pipeline. The replenishment gas pressure (generally 0.3-0.5 MPa) helps overcome pipeline resistance, ensuring smooth flow of pulverized coal in the emergency pipeline and preventing pulverized coal deposition or blockage due to insufficient pressure; nitrogen replenishment can improve the fluidization state of pulverized coal, reduce the transport concentration, and reduce pipeline wear and blockage risks.

[0035] Furthermore, the manual valve 3-1 for pipeline #2 is a DN65 manual ball valve. As a dedicated access point for main pipeline #2 (3), manual valve 3-1 isolates the switching operation from the impact on other equipment that may be connected to main pipeline #2 (3), making the switching more precise and controllable.

[0036] Furthermore, the flexible connecting pipe 5 is a metal corrugated hose. Metal corrugated hoses possess excellent flexibility, pressure resistance, and sealing properties, and can adapt to certain vibrations and displacements.

[0037] Furthermore, emergency pipeline 4 is welded between the No. 3 purging tank 1 and the No. 2 purging main pipeline 3. This welded connection ensures the strength and sealing of the pipeline interface, minimizing leakage points and improving the overall reliability of the system.

[0038] Furthermore, the diameter of emergency pipeline 4 is 1 / 3 to 1 / 2 of the diameter of main jet pipeline 3.

[0039] Furthermore, the angle between the emergency conduit 4 and the horizontal plane is 30° to 60°. The aforementioned settings for the diameter and angle of the emergency conduit 4 facilitate its installation.

[0040] In summary, the emergency continuous pulverized coal injection device provided by this utility model solves the problem of production stoppage caused by single-pipeline failure in traditional injection systems through emergency pipeline design and key valve group optimization. It eliminates the impact on blast furnace operation caused by blast furnace coal shutdown due to metal hose, pipe damage, or valve body failure, ensuring uninterrupted pulverized coal injection into the blast furnace, guaranteeing the required pulverized coal injection volume, and improving the stability of blast furnace conditions. It allows for the mutual transfer of pulverized coal between the injection tanks of two blast furnaces, while both blast furnaces can perform maintenance and replacement without stopping pulverized coal injection.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An emergency continuous pulverization device for pulverized coal pipelines, comprising a No. 1 pulverization main pipeline (2), a plurality of pulverization tanks connected to the No. 1 pulverization main pipeline (2), a No. 2 pulverization main pipeline (3), and a plurality of pulverization tanks connected to the No. 2 pulverization main pipeline (3); a flexible connecting pipe (5) is provided on each pipeline connecting the pulverization tanks and the pulverization main pipeline, and a coal powder intelligent regulating valve (5-2) is provided at the upper end of each flexible connecting pipe (5); a coal powder shut-off valve (5-1) is provided at the lower end of each flexible connecting pipe (5); characterized in that: An emergency pipeline (4) is provided between the No. 3 injection tank (1), which is closest to the No. 2 injection main pipeline (3) and connected to the No. 1 injection main pipeline (2), and the No. 2 injection main pipeline (3); the emergency pipeline (4) is located at the lower end of the flexible connecting pipe (5) and at the upper end of the pulverized coal shut-off valve (5-1); a first manual valve (4-1), a gas replenishment manual valve (4-2), and a second manual valve (4-3) are sequentially provided on the emergency pipeline (4); a No. 2 pipeline manual valve (3-1) is provided at the front end of the connection between the No. 2 injection main pipeline (3) and the emergency pipeline (4).

2. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: Both the first manual valve (4-1) and the second manual valve (4-3) are DN100 manual ball valves.

3. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: The manual gas replenishment valve (4-2) is connected to an inert gas replenishment pipeline.

4. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: The manual valve (3-1) of pipeline #2 is a DN65 manual ball valve.

5. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: The flexible connecting pipe (5) is a metal corrugated hose.

6. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: The emergency pipeline (4) is welded between the No. 3 spray tank (1) and the No. 2 spray main pipeline (3).

7. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: The diameter of the emergency pipeline (4) is 1 / 3 to 1 / 2 of the diameter of the No. 2 jetting main pipeline (3).

8. The emergency continuous injection device for pulverized coal pipelines according to claim 1, characterized in that: The emergency pipeline (4) has an angle of 30° to 60° with the horizontal plane.

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