Pressure control pipeline for charging bucket

Abstract

The utility model discloses a pressure control pipeline for a charging bucket. The pressure control pipeline for the charging bucket comprises a first pressure pipeline, a first pressure equalizing valve and a first on-off valve. The first pressure pipeline is communicated with the material tank, and the first pressure equalizing valve is connected to the first pressure pipeline in series and detachably connected with the first pressure pipeline. The first on-off valves are connected to the first pressure pipeline in series and detachably connected with the first pressure pipeline, and the at least two first on-off valves are located on the two sides of the first pressure equalizing valve correspondingly. And when the charging bucket stops discharging, the first electromagnetic valve and the second electromagnetic valve which are located on the two sides of the first pressure equalizing valve are closed correspondingly. And a connecting bolt on a flange plate connecting structure between the first pressure equalizing valve and the first pressure pipeline is detached, and the first pressure equalizing valve is detached and replaced. Therefore, when the charging bucket stops discharging and the blast furnace operates normally, online replacement of the first pressure equalizing valve can be realized, uncertain factors can be prevented from being introduced into the blast furnace under the conditions of air reduction and air stopping, and continuous and stable operation of the blast furnace is ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of blast furnace metallurgy, and specifically relates to a pressure control pipeline for a material tank. Background Art

[0002] The blast furnace uses material tanks to unload materials. Before the material tanks on the top of the furnace are unloaded into the blast furnace, a pressure equalizing valve is used to pressurize the inside of the material tanks to balance the pressure in the material tanks with the pressure in the blast furnace.

[0003] In the related art, when a pressure equalizing valve fails, it takes a long time to replace it, and there will be a wind stoppage, which affects the continuous and stable operation of the blast furnace. Utility Model Content

[0004] In order to solve the technical problem in the related art that when the equalizing valve fails, it takes a long time to replace it, there is a wind stoppage, and the continuous and stable operation of the blast furnace is affected, the present application provides a pressure control pipeline for a material tank, and the pressure control pipeline for the material tank includes:

[0005] A first pressure pipe connected to the material tank;

[0006] a first pressure equalizing valve, connected in series to the first pressure pipeline and detachably connected to the first pressure pipeline;

[0007] a first on-off valve, connected in series to the first pressure pipeline and detachably connected to the first pressure pipeline;

[0008] There are at least two first on-off valves, which are respectively located on both sides of the first pressure equalizing valve.

[0009] In some embodiments, the pressure control pipeline for the tank further includes:

[0010] The telescopic pipe and the joint pipe are connected in series to the first pressure pipeline, located on both sides of the first pressure equalizing valve and respectively located between the first on-off valve and the first pressure equalizing valve.

[0011] In some embodiments, the pressure control pipeline for the tank further includes:

[0012] The second on-off valve is connected in series to the first pressure pipeline and is close to the inlet of the first pressure pipeline.

[0013] In some embodiments, the pressure control pipeline for the tank further includes:

[0014] The first dust collector is connected between the first pressure pipe and the material tank, and the first pressure pipe is connected to the material tank through the first dust collector.

[0015] In some embodiments, the pressure control pipeline for the tank further includes:

[0016] a recovery pipe, connected to the first dust collector, for discharging the gas recovered by the first dust collector;

[0017] The recovery valve is connected in series to the recovery pipeline and is detachably connected to the recovery pipeline.

[0018] In some embodiments, the pressure control pipeline for the tank further includes:

[0019] An ejector, connected in series to the recovery pipeline;

[0020] The ejection valve connects the first pressure pipeline with the ejector, and the first pressure pipeline is connected with the ejector through the ejection valve.

[0021] In some embodiments, the pressure control pipeline for the tank further includes:

[0022] The second dust collector and the alkali spraying tower are connected in series to the recovery pipeline, and the gas in the recovery pipeline is discharged through the ejector, the second dust collector and the alkali spraying tower in sequence.

[0023] In some embodiments, the pressure control pipeline for the tank further includes:

[0024] a second pressure pipeline, the second pressure pipeline is connected to the first dust collector, and the second pressure pipeline is connected to the material tank through the first dust collector;

[0025] The second pressure equalizing valve is connected in series to the second pressure pipeline and is detachably connected to the second pressure pipeline.

[0026] In some embodiments, the pressure control pipeline for the tank further includes:

[0027] A third pressure equalizing valve is connected in series between the first dust collector and the material tank, and the first pressure pipeline is connected to the material tank through the first dust collector and the second pressure equalizing valve.

[0028] In some embodiments, the pressure control pipeline for the tank further includes:

[0029] a discharge pipe, connected to the first dust collector;

[0030] The relief valve and the muffler are respectively connected in series to the relief pipe, and the relief valve is located between the muffler and the first dust collector.

[0031] According to the pressure control pipeline for a material tank provided by one or more embodiments of the present application, the pressure control pipeline for a material tank includes a first pressure pipeline, a first equalizing valve and a first on-off valve. The first pressure pipeline is communicated with the material tank, and the first equalizing valve is connected in series with the first pressure pipeline and is detachably connected to the first pressure pipeline. The first on-off valve is connected in series with the first pressure pipeline and is detachably connected to the first pressure pipeline. The first on-off valve is at least provided with two pieces and is respectively located on both sides of the first equalizing valve. During the period when the material tank stops unloading, the first solenoid valve and the second solenoid valve on both sides of the first equalizing valve are closed respectively. The connecting bolts on the flange connection structure between the first equalizing valve and the first pressure pipeline are removed, and the first equalizing valve is removed and replaced. In this way, during the period when the material tank stops unloading, in the case of normal operation of the blast furnace (without reducing wind and stopping wind), the online replacement of the first equalizing valve can be realized, which can prevent the blast furnace from introducing uncertain factors into the blast furnace when reducing wind and stopping wind, and ensure the continuous and stable operation of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a pressure control pipeline for a material tank in one or more embodiments of the present application;

[0033] Figure 2 A schematic diagram of the structure of the coordination of the first pressure equalizing valve, the first solenoid valve, the second solenoid valve and the first pressure pipeline in one or more embodiments of the present application;

[0034] Figure 3 for Figure 2 Schematic diagram of the cross section at AA in the middle.

[0035] Description of reference numerals:

[0036] 01. First pressure pipeline; 02. Second pressure pipeline; 03. Recovery pipeline; 04. Release pipeline; 05. Connecting branch pipe; 1. Material tank; 2. Sealing valve; 3. Third pressure equalizing valve; 16. Second pressure equalizing valve; 5. First dust collector; 6. First solenoid valve; 61. Telescopic pipe; 62. Sectional pipe; 63. Blind plate; 7. First pressure equalizing valve; 8. Second solenoid valve; 9. Recovery valve; 10. Second on-off valve; 11. Release valve; 12. Muffler; 14. Ejector valve; 15. Ejector; 17. Second dust collector; 18. Soda spray tower; 19. Gas pipeline network. DETAILED DESCRIPTION

[0037] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] The blast furnace uses material tanks for unloading. Before the material tanks on the top of the furnace are unloaded into the blast furnace, they need to be pressed with an equalizing valve to balance the pressure in the material tank with the pressure in the blast furnace. When pressing the material tank, you can use the gas equalizing system and the nitrogen equalizing system connected to the material tank. The gas equalizing system uses gas for equalizing pressure, and the nitrogen equalizing system uses nitrogen for equalizing pressure. In daily production, the gas equalizing valve in the gas equalizing system is usually used to equalize the pressure of the material tank, and the nitrogen equalizing system is used as a backup. When the material tank has unloaded a batch of materials into the blast furnace, when it is necessary to load the material tank, the pressure in the material tank must be released first and the gas must be recovered so that the pressure in the material tank is the same as the atmospheric pressure, which is convenient for loading the material tank.

[0039] Taking the gas pressure equalizing system as an example, the valve body used in the gas pressure equalizing process and the gas recovery process is called a pressure equalizing recovery valve. When the pressure equalizing recovery valve is used online for a long time, it will cause failure of the pressure equalizing recovery valve.

[0040] In the related art, the blast furnace is usually equipped with a first material tank and a second material tank. When the first material tank on the top of the blast furnace cannot be pressure-equalized, the pressure recovery valve needs to be replaced online. In order not to affect production, it is necessary to remove the pressure recovery valve and replace it, use the second material tank to pull the material to the blast furnace, and reduce the wind of the blast furnace. If the replacement time is too long, the wind will be forced to stop. Because of the continuity of blast furnace production, reducing or stopping the wind in a short period of time will affect the furnace condition in the blast furnace and affect the operating stability of the blast furnace.

[0041] To solve the above technical problems, please refer to Figure 1 to Figure 2 The present application provides a pressure control pipeline for a material tank, which includes a first pressure pipeline 01, a first pressure equalizing valve 7 and a first on-off valve. The first pressure pipeline 01 transports coal gas.

[0042] The outlet of the first pressure pipeline 01 is connected to the material tank 1, and the first pressure equalizing valve 7 is connected in series to the first pressure pipeline 01 and is detachably connected to the first pressure pipeline 01 through a flange structure. The first on-off valve is connected in series to the first pressure pipeline 01 and is detachably connected to the first pressure pipeline 01 through a flange structure. There are at least two first on-off valves, which are respectively located on both sides of the first pressure equalizing valve 7. The two first on-off valves can be respectively recorded as a first solenoid valve 6 and a second solenoid valve 8.

[0043] The first solenoid valve 6 and the second solenoid valve 8 can be detachably connected to the first pressure pipe 01 through a flange structure, and can also be detachably connected to the inlet and outlet of the first equalizing pressure valve 7 through a flange structure, and can be set according to actual conditions, which is not limited in this application. It should be noted that the first on-off valve can be an electromagnetic valve such as an electric ball valve, which is not limited in this application and can be set according to actual needs.

[0044] The reaction of materials in the blast furnace takes time. During the reaction of materials in the blast furnace, the material tank 1 stops unloading. When the first pressure equalizing valve 7 fails, the first solenoid valve 6 and the second solenoid valve 8 on both sides of the first pressure equalizing valve 7 are closed respectively during the period when the material tank 1 stops unloading. Remove the connecting bolts on the flange connection structure between the first pressure equalizing valve 7 and the first pressure pipeline 01, and remove and replace the first pressure equalizing valve 7. In this way, the first pressure equalizing valve 7 can be replaced online when the material tank 1 stops unloading and the blast furnace is operating normally (without reducing or stopping the wind). This can prevent the introduction of uncertain factors into the blast furnace when the blast furnace is reducing or stopping the wind, and ensure the continuous and stable operation of the blast furnace.

[0045] In order to improve the convenience of replacing the first pressure equalizing valve 7, please refer to Figure 1 to Figure 2 , the pressure control pipeline for the material tank also includes a telescopic tube 61 and a joint tube 62, which are respectively connected in series to the first pressure pipeline 01. The telescopic tube 61 and the joint tube 62 are respectively located on both sides of the first equalizing pressure valve 7, the telescopic tube 61 is located between the first solenoid valve 6 and the first equalizing pressure valve 7, and the joint tube 62 is located between the second solenoid valve 8 and the first equalizing pressure valve 7. When replacing the first equalizing pressure valve 7, adjust the telescopic length of the telescopic tube 61 and remove the joint tube 62. Further, remove the first equalizing pressure valve 7, install the new first equalizing pressure valve 7 in place, and then reinstall the joint tube 62 in place. Finally, tighten the bolts for connecting the flange at all connection positions to achieve the replacement of the first equalizing pressure valve 7. Through the cooperation between the telescopic tube 61 and the joint tube 62, the disassembly and installation space of the first equalizing pressure valve 7 is set, and the convenience of disassembly and replacement of the first equalizing pressure valve 7 is improved.

[0046] It should be noted that the telescopic tube 61 can be a corrugated compensator, and the joint tube 62 can be a short joint, which can be selected according to actual needs and is not limited in this application.

[0047] In some embodiments, the joint tube 62 is located between the first solenoid valve 6 and the first pressure equalizing valve 7, and the telescopic tube 61 is located between the second solenoid valve 8 and the first pressure equalizing valve 7. It can be set according to implementation requirements and is not limited in this application.

[0048] In some embodiments, the telescopic tube 61 and the joint tube 62 may be arranged in groups, and two groups of the telescopic tube 61 and the joint tube 62 may be arranged and located on both sides of the first pressure equalizing valve 7, wherein the telescopic tube 61 in the first group and the joint tube 62 in the second group may be located between the first solenoid valve 6 and the first pressure equalizing valve 7, and the telescopic tube 61 in the second group and the joint tube 62 in the first group may be located between the second solenoid valve 8 and the first pressure equalizing valve 7. In this way, according to the arrangement path of the first pressure pipeline 01 and the installation angle of the first pressure equalizing valve 7, the telescopic tube 61 and the joint tube 62 of the first group or the telescopic tube 61 and the joint tube 62 of the second group can be selected to realize the disassembly and replacement of the first pressure equalizing valve 7, and the convenience of disassembly and replacement of the first pressure equalizing valve 7 can be improved.

[0049] In the process of transporting gas in the first pressure pipeline 01, in order to improve the convenience of controlling the gas flow in the first pressure pipeline 01, please refer to Figure 1 to Figure 2 The pressure control pipeline for the material tank also includes a second on-off valve 10, which is connected in series to the first pressure pipeline 01 and is close to the inlet of the first pressure pipeline 01. By controlling the opening of the first on-off valve, the gas flow rate of the gas transported from the first pressure pipeline 01 to the material tank 1 is controlled to prevent the pressure-equalizing gas flow from blowing the coke in the material tank 1 to form a vortex, thereby damaging the liner of the material tank 1 and improving the service life of the material tank 1.

[0050] The pressure control pipeline for the material tank also includes a first dust collector 5, which is connected between the first pressure pipeline 01 and the material tank 1. The first pressure pipeline 01 is connected to the material tank 1 through the first dust collector 5. The first dust collector 5 can remove impurities such as dust in the coal gas to prevent impurities such as dust in the coal gas from affecting the operation of the material tank 1. It can also prevent dust from being transported into the blast furnace through the material tank 1 and affecting the reaction effect between materials in the blast furnace, thereby improving the continuity and stability of the blast furnace operation.

[0051] The pressure control pipeline for the material tank also includes a third pressure equalizing valve 3, see Figure 1 to Figure 2 , the third pressure equalizing valve 3 is connected in series between the first dust collector 5 and the material tank 1, the first pressure pipeline 01 is connected to the material tank 1 through the first dust collector 5 and the second pressure equalizing valve 16, and the gas delivered to the material tank 1 by the first dust collector 5 can be controlled by the third pressure equalizing valve 3 to realize the stamping of the material tank 1. A connecting branch pipe 05 is also provided between the first dust collector 5 and the material tank 1, and the first dust collector 5 is connected to the material tank 1 through the connecting branch pipe 05. When the third pressure equalizing valve 3 fails, the first dust collector 5 can be connected to the material tank 1 through the connecting branch pipe 05 to ensure the continuity of the stamping of the material tank 1.

[0052] The blast furnace usually uses a belt to transport the raw materials needed for the blast furnace. After the material tank 1 has finished putting a batch of materials into the blast furnace, the gas in the material tank 1 needs to be released to make the pressure in the material tank 1 the same as the atmospheric pressure, so as to facilitate the feeding of materials into the material tank 1. When the gas in the material tank 1 is released, the released gas can be recovered.

[0053] In order to recover the gas in tank 1, please refer to Figure 1 to Figure 2 The pressure control pipeline for the material tank also includes a recovery pipeline 03 and a recovery valve 9. The recovery pipeline 03 is connected to the first dust collector 5 and is used to discharge the coal gas recovered by the first dust collector 5. The recovery valve 9 is connected in series to the recovery pipeline 03 and is detachably connected to the recovery pipeline 03. The recovery valve 9 can control the on-off of the recovery pipeline 03, thereby conveniently controlling the discharge of the coal gas recovered by the first dust collector 5 in the material tank 1.

[0054] In order to discharge the gas recovered in the first dust collector 5 through the recovery pipeline 03, the pressure control pipeline for the material tank also includes an ejector 15, which is connected in series to the recovery pipeline 03. The ejector 15 can use the pressure difference to lead the gas recovered in the first dust collector 5 to the recovery pipeline 03, and the recovery pipeline 03 discharges the recovered gas. The pressure control pipeline for the material tank also includes an ejector valve 14, which connects the first pressure pipeline 01 and the ejector 15. The first pressure pipeline 01 is connected to the ejector 15 through the ejector valve 14. In this way, when the gas in the first pressure pipeline 01 needs to be recovered, the ejector valve 14 can be opened, and under the action of the ejector 15, the gas in the first pressure pipeline 01 is led to the recovery pipeline 03, and the recovery pipeline 03 discharges the recovered gas.

[0055] The coal gas discharged from the recovery pipeline 03 can be recovered into the gas network 19. In order to improve the cleanliness of the coal gas recovered into the gas network 19, the pressure control pipeline for the material tank also includes a second dust collector 17 and an alkali spray tower 18. The coal gas recovered from the material tank 1 through the first dust collector 5 is processed by the second dust collector 17 and the alkali spray tower 18, which can improve the cleanliness of the recovered coal gas and facilitate the recovery of the coal gas and transport it to the gas network 19 for recycling.

[0056] The pressure control pipeline for the material tank also includes a release pipe 04, a release valve 11 and a muffler 12, and the release pipe 04 is connected to the first dust collector 5. The release valve 11 and the muffler 12 are respectively connected in series to the release pipe 04, and the release valve 11 is located between the muffler 12 and the first dust collector 5. The recovered coal gas in the first dust collector 5 is also released through the release valve 11 and the muffler 12, so that the pressure in the material tank 1 is the same as the atmospheric pressure, which is convenient for feeding into the material tank 1.

[0057] When the pressure equalizing recovery valve on the first pressure pipeline 01 fails, the pressure control pipeline for the material tank also includes a nitrogen pressure equalizing system, and the nitrogen pressure equalizing system can be used to pressurize the material tank 1.

[0058] The nitrogen pressure equalizing system includes a second pressure pipeline 02 and a second pressure equalizing valve 16. The second pressure pipeline 02 is communicated with the first dust collector 5. The second pressure pipeline 02 is communicated with the material tank 1 through the first dust collector 5. The second pressure equalizing valve 16 is connected in series to the second pressure pipeline 02 and is detachably connected to the second pressure pipeline 02 using a flange structure through bolts. The second pressure equalizing valve 16 is used to control the nitrogen in the second pressure pipeline 02 to be transported to the material tank 1 for stamping. The first solenoid valve 6 and the second solenoid valve 8 can be connected to both sides of the second pressure equalizing valve 16, respectively. When the second pressure equalizing valve 16 fails, it is convenient to disassemble and replace the second pressure equalizing valve 16. The second pressure equalizing valve 16 can also be connected to both sides of the telescopic pipe 61 and the joint pipe 62 to improve the convenience of replacing the second pressure equalizing valve 16.

[0059] After ensuring that the pressure in the tank 1 is the same as the atmospheric pressure, open the sealing valve 2 on the tank 1 to allow the charge to flow from the machine head discharge warehouse into the tank 1 along the flap valve discharge chute until the tank is loaded with charge and the sealing valve 2 is closed.

[0060] When replacing the first pressure equalizing valve 7 on the first pressure pipeline 01, it is necessary to ensure the sealing of the first pressure pipeline 01 while controlling the second pressure equalizing valve 16 on the second pressure pipeline 02 to pressurize the material tank 1. When the sealing of the second solenoid valve 8 is not tight, please refer to Figures 1 to 3 , the pressure control pipeline for the material tank also includes a blind plate 63. When replacing the first pressure equalizing valve 7, the second on-off valve 10 on the first pressure pipeline 01 is closed, and the second pressure equalizing valve 16 is opened at the same time, and the material tank 1 is punched with nitrogen through the second pressure pipeline 02. Then remove the joint pipe 62 and the first pressure equalizing valve 7. If the first pressure pipeline 01 is found to be leaking, it can be determined that the sealing of the first solenoid valve 6 is not strict. The blind plate 63 can be installed on the side of the telescopic tube 61 away from the first solenoid valve 6 to prevent the material tank 1 from leaking through the first solenoid valve 6 on the first pressure pipeline 01, thereby ensuring the sealing of the pressure control pipeline for the material tank, and then ensuring the accuracy of the punching control of the material tank 1 through the second pressure pipeline 02.

[0061] It should be noted that the blind plate 63 may be provided with bolt holes. When the blind plate 63 is installed on one side of the telescopic tube 61 , it may be connected via the flange structure on the telescopic tube 61 through studs, thereby improving the sealing stability and tightness of the blind plate 63 .

[0062] Before the material tank 1 is unloaded into the blast furnace, it is necessary to pressurize the material tank 1 through the first pressure pipe 01 or the second pressure pipe 02 to balance the pressure in the material tank 1 with the pressure in the blast furnace, so as to facilitate the transportation of the furnace charge in the material tank 1 to the blast furnace.

[0063] It should be noted that the pressure recovery valve used in the gas pressure equalization process and the gas recovery process can be connected to the first solenoid valve 6 and the second solenoid valve 8 on both sides of the pressure recovery valve, which is convenient for disassembly and replacement of the pressure recovery valve. At the same time, the two sides of the pressure recovery valve can also be connected with a telescopic pipe 61 and a joint pipe 62, which improves the convenience of replacing the pressure recovery valve, has a wide range of applications, and is highly practical.

[0064] During the period when material tank 1 stops unloading, under the condition of normal operation of the blast furnace (without reducing or stopping the air flow), the equalizing pressure recovery valve can be replaced online to prevent the introduction of uncertain factors into the blast furnace when the blast furnace is in the state of reducing or stopping the air flow, thereby ensuring the continuous and stable operation of the blast furnace.

[0065] When the first pressure equalizing valve 7 fails, the first pressure equalizing valve 7 is replaced during the period when the material tank 1 stops unloading. Figures 1 to 3 , the steps of replacing the first pressure equalizing valve 7 include:

[0066] 1. Close the stop valve on the first pressure pipeline 01, which is used to directly control the on-off of the first pressure pipeline 01. At the same time, open the recovery valve 9 (or the relief valve 11) to release the pressure in the tank 1.

[0067] It should be noted that, for the sake of operational safety, before replacing the first pressure equalizing valve 7, it is necessary to complete the relevant procedures for dangerous operations and obtain an operation card to ensure construction safety.

[0068] 2. Close the first solenoid valve 6 and the second solenoid valve 8 at the same time, adjust the length of the telescopic tube 61, and remove the joint tube 62.

[0069] It should be noted that, if the sealing of the first solenoid valve 6 is not tight, it is necessary to install a blind plate 63 on the side of the telescopic tube 61 away from the first solenoid valve 6. The blind plate 63 prevents the tank 1 from leaking through the first solenoid valve 6 on the first pressure pipeline 01, thereby ensuring the accuracy of stamping the tank 1 through the second pressure pipeline 02.

[0070] 3. The second pressure equalizing valve 16 on the second pressure pipe 02 connected to the material tank 1 is opened, and the material tank 1 is punched through the second pressure pipe 02, thereby ensuring that the material tank 1 can be normally discharged into the blast furnace and the normal operation of the blast furnace is ensured. Nitrogen is used to replace the gas in the material tank 1 so that the pressure in the material tank 1 is the same as the pressure in the blast furnace.

[0071] 4. Remove the bolts connected to the flange structure of the first pressure equalizing valve 7 away from the joint pipe 62 one by one, use a fall chain to stably bolt the first pressure equalizing valve 7, and prepare for installing the blind plate 63 on the side of the telescopic tube 61 away from the first solenoid valve 6.

[0072] 5. When the material tank 1 stops unloading, remove the bolts connected to the flange structure of the first pressure equalizing valve 7 away from the joint pipe 62, and disassemble the first pressure equalizing valve 7. At the same time, use the fall chain to lift the first pressure equalizing valve 7.

[0073] At the same time, the tightness of the first electromagnetic valve 6 is detected. When the tightness of the first electromagnetic valve 6 is not tight, the blind plate 63 is installed. It should be noted that in order to ensure safety during the operation, the blind plate installation process requires the operator to wear a gas mask.

[0074] 6. Install the blind plate 63 in place and resume the material pulling of the material tank 1. Transport the disassembled first pressure equalizing valve 7 out, and at the same time transport the new first pressure equalizing valve 7 to place, connect the oil cylinder of the new first pressure equalizing valve 7 to the oil pipe, and close the valve plate.

[0075] 7. When the material tank 1 stops unloading, the operator wears an anti-blocking mask to remove the blind plate 63 and transport the new first pressure equalizing valve 7 to the place. The flange structure of the first pressure equalizing valve 7 away from the joint pipe 62 is connected to the first pressure pipeline 01 through connecting bolts.

[0076] 8. Adjust the telescopic length of the telescopic tube 61 and reinstall the disassembled joint tube 62.

[0077] 9. Tighten the bolts used to connect the flanges at all connection positions to replace the first pressure equalizing valve 7.

[0078] Replacing the first equalizing valve 7 by the above steps meets the standardized operation standard, and is quick and safe compared to replacing the first equalizing valve 7 in the state of reducing wind and stopping wind of the blast furnace. The replacement method of the first equalizing valve 7 is simple, with few carrying tools and light weight. During the period when the material tank 1 stops unloading, when the blast furnace is operating normally (without reducing wind and stopping wind), the online replacement of the first equalizing valve 7 is realized online, which can prevent the blast furnace from introducing uncertain factors into the blast furnace when it is in the state of reducing wind and stopping wind, and ensure the continuous and stable operation of the blast furnace.

[0079] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0080] In the description of the present application, 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" and "counterclockwise" 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 application 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 application.

[0081] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pressure control pipeline for a material tank, characterized in that: include: A first pressure pipe connected to the material tank; a first pressure equalizing valve, connected in series to the first pressure pipeline and detachably connected to the first pressure pipeline; a first on-off valve, connected in series to the first pressure pipeline and detachably connected to the first pressure pipeline; There are at least two first on-off valves, which are respectively located on both sides of the first pressure equalizing valve.

2. The pressure control pipeline for a material tank according to claim 1, characterized in that: Also includes: The telescopic pipe and the joint pipe are connected in series to the first pressure pipeline, located on both sides of the first pressure equalizing valve and respectively located between the first on-off valve and the first pressure equalizing valve.

3. The pressure control pipeline for a material tank according to claim 1, characterized in that: Also includes: The second on-off valve is connected in series to the first pressure pipeline and is close to the inlet of the first pressure pipeline.

4. The pressure control pipeline for a material tank according to any one of claims 1 to 3, characterized in that: Also includes: The first dust collector is connected between the first pressure pipe and the material tank, and the first pressure pipe is connected to the material tank through the first dust collector.

5. The pressure control pipeline for a material tank according to claim 4, characterized in that: Also includes: a recovery pipe, connected to the first dust collector, for discharging the gas recovered by the first dust collector; The recovery valve is connected in series to the recovery pipeline and is detachably connected to the recovery pipeline.

6. The pressure control pipeline for a material tank according to claim 5, characterized in that: Also includes: An ejector, connected in series to the recovery pipeline; The ejection valve connects the first pressure pipeline with the ejector, and the first pressure pipeline is connected with the ejector through the ejection valve.

7. The pressure control pipeline for a material tank according to claim 6, characterized in that: Also includes: The second dust collector and the alkali spraying tower are connected in series to the recovery pipeline, and the gas in the recovery pipeline is discharged through the ejector, the second dust collector and the alkali spraying tower in sequence.

8. The pressure control pipeline for a material tank according to claim 4, characterized in that: Also includes: a second pressure pipeline, the second pressure pipeline being connected to the first dust collector, and the second pressure pipeline being connected to the material tank through the first dust collector; The second pressure equalizing valve is connected in series to the second pressure pipeline and is detachably connected to the second pressure pipeline.

9. The pressure control pipeline for a material tank according to claim 8, characterized in that: Also includes: A third pressure equalizing valve is connected in series between the first dust collector and the material tank, and the first pressure pipeline is connected to the material tank through the first dust collector and the second pressure equalizing valve.

10. The pressure control pipeline for a material tank according to claim 4, characterized in that: Also includes: a discharge pipe, connected to the first dust collector; The relief valve and the muffler are respectively connected in series to the relief pipe, and the relief valve is located between the muffler and the first dust collector.

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