Gas replacement method and device, gas pipeline system and storage medium

Abstract

The embodiment of the invention provides a gas replacement method and device, a gas pipeline system and a storage medium, and relates to the technical field of metallurgy. After the boiler is shut down, the pressure stabilizing blow-off valve and the inert gas adjusting valve are controlled according to preset pressure, so that coal gas in the coal gas pipeline system is discharged through the pressure stabilizing blow-off valve, and inert gas in the inert gas pipeline is fully mixed with the coal gas in the coal gas pipeline system after entering the coal gas pipeline system; under the condition that the coal gas and the inert gas are fully mixed, an inert gas adjusting valve is controlled to enable the system pressure of the coal gas pipeline system to reach the first system pressure; and under the condition that the system pressure of the gas pipeline system reaches the first system pressure, the two main relief valves are controlled to be opened and closed alternately, so that the system pressure of the gas pipeline system alternately changes between the first system pressure and the second system pressure. Therefore, full replacement of the coal gas can be guaranteed, the replacement time is shortened, and the consumption of the inert gas is reduced.

Description

Technical Field

[0001] The present application relates to the field of metallurgical technology, and in particular to a gas replacement method, device, gas pipeline system and storage medium. Background Art

[0002] Steel companies often use coal gas as fuel in their industrial production processes, and it is widely used in various industrial boilers. However, due to the flammable, explosive and toxic properties of coal gas, it is necessary to replace the gas in time after the boiler is shut down to ensure safety.

[0003] Related technologies often employ inert gas replacement. Inert gas is introduced into pipelines, mixed with the coal gas, and discharged from a discharge port. However, due to the complexity of gas pipelines, gas can easily accumulate at locations such as the top and bottom of the boiler, at corners, at pipe connections, and near valves due to the complex airflow. This creates dead zones for replacement, resulting in incomplete replacement and prolonged replacement time, leading to significant inert gas consumption. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a gas replacement method, device, gas pipeline system and storage medium to ensure sufficient replacement of gas, shorten the replacement time and reduce the consumption of inert gas.

[0005] In order to achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows: In a first aspect, the present application provides a gas replacement method, which is applied to a gas pipeline system, wherein the gas pipeline system includes a blast furnace gas main and a blast furnace gas branch pipe, the blast furnace gas main is provided with two main relief valves, the blast furnace gas branch pipe is provided with multiple pressure-stabilizing relief valves, the blast furnace gas main is further connected to an inert gas pipeline, and an inert gas regulating valve is provided on the pipeline connecting the blast furnace gas main and the inert gas pipeline; the method comprises: After the boiler is shut down, the pressure stabilizing and releasing valve and the inert gas regulating valve are controlled according to a preset pressure, so that the gas in the gas pipeline system is discharged through the pressure stabilizing and releasing valve, and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system; When the coal gas and the inert gas are fully mixed, controlling the inert gas regulating valve to make the system pressure of the gas pipeline system reach a first system pressure; When the system pressure of the gas pipeline system reaches a first system pressure, the two main relief valves are controlled to open and close alternately so that the system pressure of the gas pipeline system alternates between the first system pressure and a second system pressure; wherein the first system pressure is greater than the second system pressure.

[0006] In an optional embodiment, the blast furnace gas main is provided with a main control valve, the preset pressure includes a first preset pressure, a second preset pressure, and a third preset pressure, the gas pipeline system further includes a middle burner and a lower burner, and the blast furnace gas branch pipes corresponding to the middle burner and the lower burner are each provided with a plurality of pressure stabilizing and relief valves; after the boiler is shut down, adjusting the pressure stabilizing and relief valves and the inert gas regulating valve according to the preset pressure includes: After the boiler is shut down, the main control valve, the pressure stabilizing and relief valve corresponding to the lower burner, and the inert gas regulating valve are controlled according to the first preset pressure and the second preset pressure to stabilize the gas pipeline system at a small flow rate; The pressure-stabilizing relief valve and the inert gas regulating valve corresponding to the middle-level burner are controlled according to the third preset pressure to perform large-flow mixing on the gas pipeline system; wherein the first preset pressure is less than the second preset pressure, and the second preset pressure is less than the third preset pressure.

[0007] In an optional embodiment, the main control valve includes a blast furnace gas quick-cut valve and a blast furnace gas butterfly valve, and controlling the main control valve, the pressure-stabilizing relief valve corresponding to the lower burner, and the inert gas regulating valve according to the first preset pressure and the second preset pressure includes: Open the blast furnace gas quick cut-off valve and close the blast furnace gas butterfly valve. When the blast furnace gas main is water-sealed, open the pressure-stabilizing relief valve corresponding to the lower burner. If the system pressure of the gas pipeline system reaches the first preset pressure, the inert gas regulating valve is opened, and the system pressure is stabilized at the second preset pressure by adjusting the opening of the inert gas regulating valve.

[0008] In an optional embodiment, controlling the pressure stabilizing relief valve and the inert gas regulating valve corresponding to the middle burner according to the third preset pressure includes: The pressure stabilizing and relief valve corresponding to the middle burner is opened, the inert gas regulating valve is opened and controlled, and the system pressure is stabilized at the third preset pressure by adjusting the opening of the inert gas regulating valve.

[0009] In an optional embodiment, the blast furnace gas main further includes an east blast furnace gas main and a west blast furnace gas main, the main relief valve includes a first main relief valve and a second main relief valve, and the first main relief valve is arranged on the east blast furnace gas main, and the second main relief valve is arranged on the west blast furnace gas main; and the controlling the two main relief valves to open and close alternately includes: determining any one of the first master relief valve and the second master relief valve as a target master relief valve, and controlling the target master relief valve to open so as to reduce the system pressure of the gas pipeline system; When the system pressure drops to the second system pressure, the target master relief valve is closed to increase the system pressure; and when the system pressure rises to the second system pressure, the master relief valve that was not opened last time between the first and second master relief valves is determined as a new target master relief valve, and the new target master relief valve is controlled to open to reduce the system pressure of the gas pipeline system; Repeating the steps of closing the target master relief valve to increase the system pressure when the system pressure drops to the second system pressure, and determining the master relief valve that was not opened last time between the first master relief valve and the second master relief valve as a new target master relief valve when the system pressure rises to the second system pressure, and controlling the new target master relief valve to open to reduce the system pressure of the gas pipeline system.

[0010] In an optional embodiment, the method further comprises: When the number of alternations between the two main relief valves reaches a preset number, obtaining the carbon monoxide content in the gas pipeline system; If the carbon monoxide content is less than the preset content, it is determined that the gas replacement is completed, and the control of the alternating opening and closing of the two main relief valves is stopped; If the carbon monoxide content is not less than the preset content, the two main relief valves are controlled to open and close alternately until the carbon monoxide content is less than the preset content.

[0011] In a second aspect, the present application provides a gas replacement device for use in a gas pipeline system, the gas pipeline system comprising a blast furnace gas main and a blast furnace gas branch pipe, the blast furnace gas main being provided with two main relief valves, the blast furnace gas branch being provided with multiple pressure-stabilizing relief valves, the blast furnace gas main being further connected to an inert gas pipeline, and an inert gas regulating valve being provided on the pipeline connecting the blast furnace gas main and the inert gas pipeline; the device comprising: a pressure stabilizing and releasing module, configured to control the pressure stabilizing and releasing valve and the inert gas regulating valve according to a preset pressure after the boiler is shut down, so that the gas in the gas pipeline system is discharged through the pressure stabilizing and releasing valve and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system; The pressure stabilizing and releasing module is further configured to control the inert gas regulating valve so that the system pressure of the gas pipeline system reaches the first system pressure when the coal gas and the inert gas are fully mixed; The pressure-variable purge module is configured to control the two main relief valves to alternately open and close when the system pressure of the gas pipeline system reaches a first system pressure, so that the system pressure of the gas pipeline system alternates between the first system pressure and a second system pressure; wherein the first system pressure is greater than the second system pressure.

[0012] In an optional embodiment, the blast furnace gas main includes a main blast furnace gas main, the main blast furnace gas main is provided with a main control valve, the preset pressure includes a first preset pressure, a second preset pressure and a third preset pressure, the gas pipeline system further includes a middle burner and a lower burner, and the blast furnace gas branch pipes corresponding to the middle burner and the lower burner are each provided with a plurality of pressure stabilizing and relief valves; The pressure stabilizing and releasing module is further configured to, after the boiler is shut down, control the main control valve, the pressure stabilizing and releasing valve corresponding to the lower burner, and the inert gas regulating valve according to the first preset pressure and the second preset pressure, so as to perform a small-flow pressure relief on the gas pipeline system; and control the pressure stabilizing and releasing valve corresponding to the middle burner and the inert gas regulating valve according to the third preset pressure, so as to perform a large-flow pressure relief on the gas pipeline system; wherein the first preset pressure is lower than the second preset pressure, and the second preset pressure is lower than the third preset pressure.

[0013] In a third aspect, the present application provides a gas pipeline system, comprising a blast furnace gas main and a blast furnace gas branch pipe, wherein the blast furnace gas main pipe is provided with two main relief valves, and the blast furnace gas branch pipe is provided with multiple pressure-stabilizing relief valves. The blast furnace gas main pipe is also connected to an inert gas pipeline, and an inert gas regulating valve is provided on the pipeline connecting the blast furnace gas main pipe and the inert gas pipeline. The gas pipeline system also includes a controller, which is used to implement the method described in any one of the aforementioned embodiments.

[0014] In a fourth aspect, the present application provides a storage medium having a computer program stored thereon, which, when executed by a controller, can implement the method described in any one of the aforementioned embodiments.

[0015] The gas replacement method, device, gas pipeline system and storage medium provided in the embodiments of the present application can accurately control the pressure-stabilizing relief valve and the inert gas regulating valve through a preset pressure after the boiler is shut down to achieve sufficient mixing of the gas and the inert gas, and utilize the alternating opening and closing operation of the main relief valve to make the system pressure of the gas pipeline system alternate between the first system pressure and the second system pressure, thereby completely removing the residual gas in each dead corner, ensuring sufficient replacement of the gas, shortening the replacement time, and reducing the consumption of inert gas.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a gas pipeline system provided in an embodiment of the present application is shown; Figure 2 A schematic diagram of a process of a gas replacement method provided in an embodiment of the present application is shown; Figure 3 Another flow chart of the gas replacement method provided in an embodiment of the present application is shown; Figure 4 A functional module diagram of a gas replacement device provided in an embodiment of the present application is shown.

[0019] Icons: 1- blast furnace gas butterfly valve; 2- nitrogen manual valve; 3- nitrogen check valve; 4- inert gas regulating valve; 6- blast furnace gas quick cut valve; 7- burner regulating valve; 8- burner quick cut valve; 9- pressure stabilizing and releasing valve; 10- sampling valve; 11- main releasing valve; 100- pressure stabilizing and releasing module; 110- pressure changing and purge module. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present application.

[0022] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0023] Inert gases, also known as noble gases, are a group of chemically inert gases from Group 18 of the periodic table, including helium, neon, argon, krypton, xenon, and radon. These gases share a common characteristic: their outermost electron shells are saturated, rendering them virtually unreactive with other elements. This high stability makes inert gases ideal safety media in industrial applications, particularly those involving flammable and explosive atmospheres. Inert gases are typically colorless, odorless, and monatomic. Their physical properties, such as density and boiling point, increase with increasing atomic number, but chemical inertness remains their core characteristic.

[0024] Based on this, inert gas plays a key role in the gas replacement process.

[0025] Next, taking nitrogen as an inert gas as an example, the gas pipeline system provided in the embodiment of the present application is first exemplarily introduced in conjunction with the structural schematic diagram.

[0026] Specifically, Figure 1 For a schematic diagram of the structure of the gas pipeline system provided in the embodiment of this application, please refer to Figure 1 The gas pipeline system includes a blast furnace gas main and a blast furnace gas branch pipe. Two main relief valves 11 are provided on the blast furnace gas main pipe, and multiple pressure-stabilizing relief valves 9 are provided on the blast furnace gas branch pipe. The blast furnace gas main pipe is also connected to the inert gas pipeline, and an inert gas regulating valve 4 is provided on the pipeline connecting the blast furnace gas main pipe and the inert gas pipeline.

[0027] Optionally, the blast furnace gas main, serving as the primary channel for gas delivery, is equipped with two main relief valves to rapidly relieve the gas pipeline system's pressure and discharge residual gas at specific stages. Multiple pressure-stabilizing relief valves on the blast furnace gas branch pipes assist in the mixing process of gas and inert gas, ensuring sufficient gas exchange and preventing safety hazards caused by pressure fluctuations.

[0028] Alternatively, the inert gas pipeline can be connected to the blast furnace gas main by means of a flexible connection. As can be understood, this flexible connection method is not only convenient for installation and maintenance, but also can effectively cope with pressure changes under different working conditions.

[0029] In this embodiment, nitrogen (or other inert gas) in the inert gas pipeline can enter the blast furnace gas main through the inert gas regulating valve, and the flow rate of the inert gas entering the blast furnace gas main can be adjusted by controlling the opening of the gas regulating valve, thereby adjusting the pressure of the gas pipeline system and keeping the pressure of the gas pipeline system in a stable state.

[0030] Optionally, the pressure stabilizing relief valve can be controlled by a pneumatic shut-off valve to achieve automated operation according to time and pressure control, while the main relief valve can be controlled in a pressure control mode according to the pressure of the gas pipeline system.

[0031] Optionally, the gas pipeline system may further include a main controller, which may be used to execute a computer program to implement the gas replacement method provided in the embodiment of the present application.

[0032] Next, the above Figure 1 The controller in the gas pipeline system is the execution body, and the gas replacement method provided by the embodiment of the present application is exemplarily introduced in combination with the flow chart. Specifically, Figure 2 A flow chart of the gas replacement method provided in the embodiment of the present application is shown in FIG. Figure 2 , the method comprising: In step S20, after the boiler is shut down, the pressure-stabilizing relief valve and the inert gas regulating valve are controlled according to a preset pressure, so that the gas in the gas pipeline system is discharged through the pressure-stabilizing relief valve and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system.

[0033] Please continue to see Figure 1 The gas pipeline system also includes multiple burners, and a burner regulating valve 7 and a burner quick-cut valve 8 are provided on the east and west pipelines of the blast furnace gas branch pipe corresponding to each burner. A nitrogen manual valve 2 and a nitrogen check valve 3 are also provided on the pipeline connecting the blast furnace gas main and the inert gas pipeline.

[0034] Optionally, after the boiler is shut down, the burner regulating valve 7 and the burner quick-cut valve 8 are both closed to prevent gas from continuing to flow into the boiler and causing safety hazards. In addition, to facilitate gas replacement, the nitrogen manual valve and nitrogen check valve can be opened after the blast furnace gas main is soft-connected to the inert gas pipeline.

[0035] Considering that when gas replacement is carried out, if there is a lack of precise control over the input amount and pressure of the inert gas, the pressure in the gas pipeline system may rise rapidly, exceeding its designed tolerance range and eventually causing pipeline damage.

[0036] It's important to note that the design pressure of a gas pipeline system is determined based on its normal operating conditions, while gas displacement operations are a special case. Under normal operating conditions, the pressure within the gas pipeline system is relatively stable, and there are no sudden pressure increases caused by the rapid injection of external gas. However, during the gas displacement process, a certain amount of inert gas must be introduced into the gas pipeline system to ensure complete gas removal and prevent the formation of explosive mixtures. If the inert gas input pressure is too high or the flow rate is too large, the pressure within the gas pipeline system may exceed its design limit, resulting in overpressure damage to the pipeline.

[0037] In this embodiment, the pressure in the gas pipeline system can be gradually released by controlling the pressure-stabilizing relief valve and the inert gas regulating valve according to a preset pressure, so that the inert gas enters the gas pipeline system and is fully mixed with the gas, thereby ensuring that the system pressure of the gas pipeline system is precisely controlled, thereby effectively avoiding the risk of overpressure caused by pressure accumulation.

[0038] Optionally, the preset pressure can be set according to actual application conditions.

[0039] Step S21 : When the coal gas and the inert gas are fully mixed, the inert gas regulating valve is controlled to make the system pressure of the coal gas pipeline system reach the first system pressure.

[0040] In this embodiment, the controller can determine whether the coal gas and the inert gas are fully mixed according to the specific control conditions, for example, determining whether the system pressure of the gas pipeline system is at a certain pressure and reaches a certain time, or determining whether the coal gas and the inert gas are fully mixed according to the concentration of the mixed gas, etc.

[0041] In this embodiment, it is first necessary to ensure that the system pressure of the gas pipeline system has reached the first system pressure, the purpose of which is to provide a higher initial pressure condition for the subsequent pressure-changing purge operation.

[0042] Step S22 : When the system pressure of the gas pipeline system reaches the first system pressure, the two main relief valves are controlled to open and close alternately, so that the system pressure of the gas pipeline system alternates between the first system pressure and the second system pressure.

[0043] The first system pressure is greater than the second system pressure.

[0044] Optionally, the first system pressure and the second system pressure can be set according to actual application conditions. In one possible implementation, the first system pressure can be 8 kPa, and the second system pressure can be 1 kPa.

[0045] Optionally, after the system pressure of the gas pipeline system reaches the first system pressure, the controller can alternately control the opening and closing of the two main relief valves, thereby causing the system pressure of the gas pipeline system to fluctuate between the first system pressure and the second system pressure. It is understandable that this alternating opening and closing design has the following key functions: on the one hand, due to the large diameter of the main relief valve, its pressure relief capacity is relatively strong. Therefore, the rapid pressure relief function of the main relief valve can completely discharge the residual gas in the dead corners of the gas pipeline system, ensuring that each pressure relief operation can effectively remove the residual gas in the pipeline; on the other hand, through repeated pressure increase and pressure relief operations, the efficiency of gas replacement can be significantly improved, while avoiding the problem of sudden pressure drop caused by a single pressure relief operation.

[0046] In addition, since the gas replacement efficiency is improved, the replacement time can be shortened and the consumption of inert gas can be reduced.

[0047] It is understandable that this dynamic pressure regulation method can not only ensure that the pressure in the gas pipeline system is always within a controllable range, but also minimize the amount of residual gas. Especially in complex pipeline structures, the problem of difficulty in removing dead corner gas in traditional methods can be effectively solved by alternating the opening and closing operation of the main relief valve, thereby significantly improving the safety and reliability of gas replacement. The gas replacement method provided in the embodiment of the present application can accurately control the pressure-stabilizing relief valve and the inert gas regulating valve through a preset pressure after the boiler is shut down to achieve full mixing of gas and inert gas, and utilize the alternating opening and closing operation of the main relief valve to make the system pressure of the gas pipeline system alternate between the first system pressure and the second system pressure, thereby completely removing the residual gas in each dead corner, ensuring full replacement of gas, shortening the replacement time, and reducing the consumption of inert gas.

[0048] Optionally, multiple burners can be divided into upper burners, middle burners and lower burners, please continue to see Figure 1 The blast furnace gas main is provided with a main control valve, and the blast furnace gas branch pipes corresponding to the middle burner and the lower burner are provided with multiple pressure stabilizing and releasing valves 9.

[0049] In one possible implementation, the number of the pressure stabilizing and releasing valves may be four.

[0050] Optionally, the main pipe control valve can control the blast furnace gas main pipe.

[0051] Optionally, the preset pressure includes a first preset pressure, a second preset pressure and a third preset pressure, and the first preset pressure, the second preset pressure and the third preset pressure can all be set according to actual application conditions.

[0052] In this embodiment, sufficient mixing of the inert gas and the coal gas can be achieved through two stages: small flow rate pressure stabilization and large flow rate mixing.

[0053] Specifically, in Figure 2 On the basis of Figure 3 For another flow chart of the gas replacement method provided in the embodiment of the present application, please refer to Figure 3 , the above step S20 can also be implemented by the following steps: Step S20-1, after the boiler is shut down, the main control valve, the pressure stabilizing relief valve corresponding to the lower burner, and the inert gas regulating valve are controlled according to the first preset pressure and the second preset pressure to stabilize the gas pipeline system at a small flow rate.

[0054] In this embodiment, the boiler must first be shut down and all burner quick-cut valves and regulating valves must be closed to cut off the gas supply and isolate the burner area. Subsequently, the gas pipeline system is depressurized by controlling the main gas control valve, the corresponding pressure-stabilizing relief valves for the lower burners, and the inert gas regulating valve using the first and second preset pressures. This allows inert gas to enter the blast furnace gas main, maintaining a stable pressure in the gas pipeline system.

[0055] It is understandable that the flow rate of the inert gas is relatively small at this time, and its purpose is to achieve safe pressure relief of the gas pipeline system.

[0056] Step S20-2, controlling the pressure stabilizing relief valve and the inert gas regulating valve corresponding to the middle burner according to the third preset pressure to perform large-flow mixing on the gas pipeline system; wherein the first preset pressure is less than the second preset pressure, and the second preset pressure is less than the third preset pressure.

[0057] Optionally, since large-flow mixing is required at this stage, in order to ensure that the inert gas and coal gas are fully mixed at a safe pressure, it is necessary to provide a sufficient pressure relief path for the gas pipeline system by controlling the pressure-stabilizing relief valve corresponding to the middle-level burner, so that the large-flow nitrogen input can be more effectively mixed with the residual coal gas.

[0058] It's important to note that coal gas, a flammable, explosive, and toxic gas, can cause serious safety accidents if not properly handled after a boiler is shut down. When a boiler stops operating, the pressure within the gas pipeline system gradually drops. If the system pressure drops to zero or near zero, outside air may enter the gas pipeline through bleed valves or other openings, mixing with the residual coal gas to form an explosive mixture. If this mixture encounters an ignition source (such as hot components or static sparks), it is highly likely to cause an explosion, resulting in casualties and property damage.

[0059] Based on this, in order to solve this problem, the system pressure can be first released to the first preset pressure by controlling the main control valve and the pressure-stabilizing relief valve corresponding to the lower burner, and then the system pressure can be stabilized at the second preset pressure by controlling the inert gas regulating valve to ensure the safe pressure relief of small flow in the gas pipeline system.

[0060] For details, please see Figure 1 The main control valve includes a blast furnace gas quick-cut valve 6 and a blast furnace gas butterfly valve 1.

[0061] In this embodiment, the controller opens the blast furnace gas quick-cut valve and closes the blast furnace gas butterfly valve. If the blast furnace gas main is water-sealed, the controller opens the pressure-stabilizing relief valve corresponding to the lower burner. If the system pressure of the gas pipeline system reaches a first preset pressure, the controller opens the inert gas regulating valve and adjusts the opening of the inert gas regulating valve to stabilize the system pressure at a second preset pressure.

[0062] Alternatively, a water seal refers to a safety device primarily used to seal, isolate, and relieve pressure, preventing gas leakage or air intrusion, ensuring the safe operation of the gas transmission system. It uses a water column of a certain height to form a liquid seal barrier. The gas pressure in the gas pipeline must overcome the static pressure of the water column to pass through. If the gas pressure falls below the set pressure of the water seal (usually determined by the height of the water column), the gas cannot penetrate the water layer, thus achieving a one-way blockage or complete isolation effect.

[0063] In this embodiment, when the boiler has entered the shutdown state, the quick-cut valves and regulating valves on each burner floor can be closed. This operation cuts off the gas supply, providing the necessary prerequisites for subsequent replacement operations. Subsequently, the blast furnace gas quick-cut valve can be opened, and the blast furnace gas butterfly valve can be closed simultaneously, completing the water seal operation of the blast furnace gas main pipeline.

[0064] Next, the controller opens the pressure-stabilizing relief valves corresponding to the four lower corners of the boiler (i.e., the pressure-stabilizing relief valves corresponding to the lower burners), thereby starting the system pressure relief operation. Specifically, as the pressure-stabilizing relief valves gradually open, the system pressure gradually drops to the first preset pressure.

[0065] In one possible implementation, the first preset pressure may be 0.5 KPa.

[0066] In this embodiment, when the system pressure drops to the first preset pressure, the controller can open the inert gas regulating valve to allow the inert gas to enter the blast furnace gas system through the inert gas regulating valve, and stabilize the system pressure at the second preset pressure by adjusting the opening of the regulating valve.

[0067] In one possible implementation, the second preset pressure may be 1 KPa.

[0068] Optionally, the controller may first open the inert gas regulating valve according to a preset opening to make the system pressure reach a second preset pressure. After the system pressure reaches the second preset pressure, the opening of the inert gas regulating valve may be reduced to stabilize the system pressure at the second preset pressure.

[0069] It can be understood that this small-flow pressure-stabilizing operation has the following key functions: on the one hand, through the pressure relief function of the pressure-stabilizing relief valve, the pressure of the gas system can be effectively reduced and the gas can be initially released; on the other hand, through the timely replenishment and pressure regulation of inert gas, the pressure of the gas system can be stabilized within the set range, preventing air from entering the gas pipeline through the release pipe and forming an explosive mixed gas.

[0070] Because the boiler furnace is under negative pressure when the system pressure stabilizes at the second preset pressure, it is difficult for outside air to flow back into the gas pipeline through the vent pipe, significantly reducing the probability of forming an explosive gas mixture. Furthermore, by precisely controlling the opening of the inert gas regulating valve, the gas system pressure is consistently maintained near the set second preset pressure, ensuring the safety and stability of the entire low-flow pressure stabilization process.

[0071] Obviously, this application achieves small-flow pressure stabilization of the gas pipeline system by controlling the operation of relevant valves and regulating valves according to the first preset pressure and the second preset pressure, laying a solid foundation for subsequent large-flow mixing and variable-pressure purging.

[0072] Optionally, to ensure system stability, the controller may perform high-flow mixing on the gas pipeline system when the system pressure is stable at the second preset pressure for a certain period of time (eg, the first preset period of time).

[0073] In this embodiment, the controller can open the pressure-stabilizing relief valve corresponding to the middle burner, open and control the inert gas regulating valve, and stabilize the system pressure at the third preset pressure by adjusting the opening of the inert gas regulating valve.

[0074] During the above steps, it's first necessary to ensure that the pressure-stabilizing and relief valves corresponding to the boiler's middle burners are open. Specifically, when the high-flow mixing phase begins, the four pressure-stabilizing and relief valves in the middle of the boiler automatically open, while all eight pressure-stabilizing and relief valves in the middle and lower layers of the boiler are also open. This operation provides sufficient pressure relief paths for the gas pipeline system, allowing the subsequent high-flow nitrogen input to more effectively mix with the residual gas.

[0075] Next, the controller increases the opening of the inert gas regulating valve, allowing a large amount of inert gas to enter the gas pipeline system. Due to the high pressure of the inert gas, it diffuses rapidly upon entering the pipeline and mixes thoroughly with the coal gas within it. As the system pressure gradually rises to approach a third preset pressure, the controller decreases the opening of the inert gas regulating valve, ultimately stabilizing the blast furnace gas system pressure around the third preset pressure.

[0076] In one possible implementation, the third preset pressure may be 5 KPa.

[0077] Understandably, this high-flow mixing operation has the following key benefits: First, the rapid introduction of large quantities of inert gas significantly improves the efficiency of mixing between coal gas and inert gas. Second, due to the high pressure of the inert gas, it can quickly cover all areas of the gas pipeline system, effectively reducing the possibility of residual coal gas. Furthermore, by precisely controlling the opening of the inert gas regulating valve, the system pressure can be consistently maintained within the set range, avoiding safety hazards caused by excessive or insufficient pressure.

[0078] Obviously, the embodiment of the present application can achieve large-flow mixing of the gas pipeline system by controlling the operation of the relevant valves according to the third preset pressure, thereby ensuring sufficient mixing of the inert gas and the gas, laying a solid foundation for the subsequent pressure-changing purge, and ensuring the reliability of the subsequent pressure-changing purge.

[0079] In this embodiment, the controller can determine that the coal gas and inert gas are fully mixed when the system pressure remains stable at a third preset pressure for a certain period of time (e.g., a second preset period of time). Alternatively, if the third preset pressure is consistent with the first system pressure, the system can proceed directly to the pressure swing purge phase without further control of the inert gas regulating valve. If the third preset pressure is inconsistent with the first system pressure, the inert gas regulating valve must be controlled to bring the system pressure of the coal gas pipeline system back to the first system pressure.

[0080] In this embodiment, the third preset pressure is often lower than the first system pressure. In this case, the controller may first increase the opening of the inert gas regulating valve to allow the system pressure of the gas pipeline system to reach the first system pressure, and then enter the pressure change purge stage.

[0081] Next, a possible implementation method is provided for how to achieve variable pressure purge of the gas pipeline system, that is, how to control the alternating opening and closing of the two main relief valves.

[0082] For details, please see Figure 1 The blast furnace gas main also includes an east blast furnace gas main and a west blast furnace gas main. The main relief valve includes a first main relief valve and a second main relief valve. The first main relief valve is arranged on the east blast furnace gas main, and the second main relief valve is arranged on the west blast furnace gas main.

[0083] In this embodiment, the controller may determine any one of the first master relief valve and the second master relief valve as the target master relief valve, and control the target master relief valve to open so as to reduce the system pressure of the gas pipeline system.

[0084] When the system pressure drops to the second system pressure, the controller can close the target master relief valve to increase the system pressure. When the system pressure rises to the second system pressure, the controller determines the master relief valve that was not opened last time between the first master relief valve and the second master relief valve as the new target master relief valve, and controls the new target master relief valve to open to reduce the system pressure of the gas pipeline system.

[0085] Repeat the steps of closing the target master relief valve to increase the system pressure when the system pressure drops to the second system pressure, and determining the master relief valve that was not opened last time between the first and second master relief valves as the new target master relief valve when the system pressure rises to the second system pressure, and controlling the new target master relief valve to open to reduce the system pressure of the gas pipeline system, thereby achieving alternating opening and closing.

[0086] In one possible implementation, the controller may first identify the first master relief valve as the target master relief valve and open it to relieve pressure, thereby reducing the system pressure in the gas pipeline system. Because the master relief valve has a larger diameter and greater pressure-relieving capacity, the system pressure can be quickly reduced to the second system pressure, rapidly discharging gas from dead zones within the gas pipeline.

[0087] When the system pressure drops to the second system pressure, the controller can close the target master relief valve (i.e., the first master relief valve). At this point, with the continued inert gas input, the gas system pressure will rise back to the first system pressure. In this case, the controller can identify the second master relief valve on the west blast furnace gas main as the new target master relief valve and open it to reduce the system pressure to the second system pressure again.

[0088] This process is repeated to ensure that the dead-spot gas is completely exhausted.

[0089] It can be understood that by controlling the first main relief valve and the second main relief valve to open and close alternately, on the one hand, since the main relief valve has a larger pipe diameter and a stronger pressure relief capacity, the dead corner gas in the gas pipeline system can be effectively cleared through the rapid pressure relief function of the main relief valve, especially the residual gas that is difficult to discharge through conventional methods, ensuring that each pressure relief operation can effectively clear the residual gas in the pipeline; on the other hand, the efficiency of gas replacement can be significantly improved through repeated pressure increase and pressure relief operations, while avoiding the problem of sudden pressure drop caused by a single pressure relief operation.

[0090] Optionally, since the gas in the gas pipeline system can be fully replaced after the two main relief valves are controlled to open and close alternately for a period of time, the controller also needs to determine whether the replacement is completed, so as to stop the replacement in time to reduce the consumption of inert gas.

[0091] In one possible implementation, a carbon monoxide content detection device may be provided in the gas pipeline system to detect the carbon monoxide content in real time, and the controller may determine whether the replacement should be stopped based on the carbon monoxide content.

[0092] In another possible implementation, the controller may further detect the carbon monoxide content when the gas pipeline system meets certain conditions.

[0093] For example, after controlling the two main relief valves to open and close alternately for a certain period of time (e.g., a third preset period of time), the carbon monoxide content is detected again, and it is determined whether the replacement should be stopped based on the carbon monoxide content. Alternatively, when the number of alternating times between the two main relief valves reaches a preset number, the carbon monoxide content in the gas pipeline system is obtained.

[0094] It can be understood that if the carbon monoxide content is less than the preset content, it can be determined that the gas replacement is completed, and the control of the two main relief valves to open and close alternately is stopped. Conversely, if the carbon monoxide content is not less than the preset content, the two main relief valves continue to be controlled to open and close alternately until the carbon monoxide content is less than the preset content.

[0095] In one possible implementation, see Figure 1 A plurality of sampling valves 10 may also be provided on the blast furnace gas branch pipe in the gas pipeline system. For example, four sampling valves may be provided. Then, when the number of alternations between the two main relief valves reaches a preset number, the controller may open these sampling valves to perform sampling detection near the sampling valves to determine whether the carbon monoxide content is less than the preset content.

[0096] It can be understood that in this case, if the carbon monoxide content at multiple sampling valves is less than the preset content, it can be determined that the carbon monoxide content in the gas pipeline system is less than the preset content. If the carbon monoxide content at at least one sampling valve is not less than the preset content, it can be determined that the carbon monoxide content in the gas pipeline system is also not less than the preset content.

[0097] In order to execute the corresponding steps in the above embodiments and various possible methods, a method for implementing a gas replacement device is given below. Figure 4 , Figure 4 This is a functional block diagram of a gas replacement device provided in an embodiment of the present application. It should be noted that the basic principles and technical effects of the gas replacement device provided in this embodiment are the same as those in the aforementioned embodiments. For the sake of brevity, any details not mentioned in this embodiment are referenced to the corresponding content in the aforementioned embodiments. The gas replacement device includes a pressure stabilizing and dissipating module 100 and a pressure variable purge module 110.

[0098] The pressure stabilizing and releasing module 100 is used to control the pressure stabilizing and releasing valve and the inert gas regulating valve according to a preset pressure after the boiler is shut down, so that the gas in the gas pipeline system is discharged through the pressure stabilizing and releasing valve and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system.

[0099] It is understandable that the voltage stabilizing and releasing module 100 can also be used to perform the above step S20.

[0100] The pressure stabilizing and releasing module 100 is further used to control the inert gas regulating valve so that the system pressure of the gas pipeline system reaches the first system pressure when the coal gas and the inert gas are fully mixed.

[0101] It can be understood that the voltage stabilizing and releasing module 100 can also be used to perform the above step S21.

[0102] The pressure-variable purge module 110 is used to control the two main relief valves to open and close alternately when the system pressure of the gas pipeline system reaches a first system pressure, so that the system pressure of the gas pipeline system alternates between the first system pressure and the second system pressure; wherein the first system pressure is greater than the second system pressure.

[0103] It is understandable that the pressure-changing purge module 110 can also be used to perform the above-mentioned step S22.

[0104] Optionally, the pressure stabilizing and releasing module 100 is also used to control the main control valve, the pressure stabilizing and releasing valve corresponding to the lower burner, and the inert gas regulating valve according to the first preset pressure and the second preset pressure after the boiler is shut down, so as to perform small-flow pressure stabilization on the gas pipeline system; and control the pressure stabilizing and releasing valve and the inert gas regulating valve corresponding to the middle burner according to the third preset pressure, so as to perform large-flow mixing on the gas pipeline system; wherein the first preset pressure is lower than the second preset pressure, and the second preset pressure is lower than the third preset pressure.

[0105] Optionally, the pressure stabilizing and releasing module 100 is also used to open the blast furnace gas quick-cut valve and close the blast furnace gas butterfly valve, and when the blast furnace gas main is water-sealed, open the pressure stabilizing and releasing valve corresponding to the lower burner; if the system pressure of the gas pipeline system reaches a first preset pressure, open the inert gas regulating valve, and stabilize the system pressure at a second preset pressure by adjusting the opening of the inert gas regulating valve.

[0106] Optionally, the pressure stabilizing and releasing module 100 is further used to open the pressure stabilizing and releasing valve corresponding to the middle burner, open and control the inert gas regulating valve, and stabilize the system pressure at a third preset pressure by adjusting the opening of the inert gas regulating valve.

[0107] Optionally, the pressure-variable purge module 110 is further configured to determine any one of the first and second master relief valves as a target master relief valve, and control the target master relief valve to open so as to reduce the system pressure of the gas pipeline system; when the system pressure drops to the second system pressure, close the target master relief valve to increase the system pressure; and when the system pressure rises to the second system pressure, determine the last unopened master relief valve of the first and second master relief valves as a new target master relief valve, and control the new target master relief valve to open so as to reduce the system pressure of the gas pipeline system; and repeatedly perform the steps of closing the target master relief valve to increase the system pressure when the system pressure drops to the second system pressure, and when the system pressure rises to the second system pressure, determining the last unopened master relief valve of the first and second master relief valves as the new target master relief valve, and control the new target master relief valve to open so as to reduce the system pressure of the gas pipeline system.

[0108] Optionally, the pressure-variable purge module 110 is further configured to obtain the carbon monoxide content in the gas pipeline system when the number of alternating times between the two main relief valves reaches a preset number; if the carbon monoxide content is less than the preset content, it is determined that the gas replacement is completed, and the control of the alternating opening and closing of the two main relief valves is stopped; if the carbon monoxide content is not less than the preset content, the alternating opening and closing of the two main relief valves is continued until the carbon monoxide content is less than the preset content.

[0109] The gas replacement device provided in an embodiment of the present application uses a pressure-stabilizing and releasing module to control a pressure-stabilizing and releasing valve and an inert gas regulating valve according to a preset pressure after the boiler is shut down, so that the gas in the gas pipeline system is discharged through the pressure-stabilizing and releasing valve and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system. When the gas and inert gas are fully mixed, the inert gas regulating valve is controlled to ensure that the system pressure of the gas pipeline system reaches a first system pressure. When the system pressure of the gas pipeline system reaches the first system pressure, the pressure-variable purge module controls the two main release valves to alternately open and close, so that the system pressure of the gas pipeline system alternates between the first system pressure and the second system pressure, wherein the first system pressure is greater than the second system pressure. Therefore, residual gas in each dead zone can be completely removed, ensuring sufficient gas replacement, shortening the replacement time, and reducing inert gas consumption.

[0110] The present application also provides a storage medium having a computer program stored thereon. When executed by a controller, the computer program can implement the gas replacement method provided in the present application. In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of the apparatus, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagram can represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagrams and / or flowcharts, and combinations of boxes in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0111] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0112] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the existing technology, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0113] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A gas replacement method, characterized in that: The invention is applied to a gas pipeline system, wherein the gas pipeline system includes a blast furnace gas main pipe and a blast furnace gas branch pipe, the blast furnace gas main pipe is provided with two main relief valves, the blast furnace gas branch pipe is provided with multiple pressure stabilizing relief valves, the blast furnace gas main pipe is also connected to an inert gas pipeline, and an inert gas regulating valve is provided on the pipeline connecting the blast furnace gas main pipe and the inert gas pipeline; the method comprises: After the boiler is shut down, the pressure stabilizing and releasing valve and the inert gas regulating valve are controlled according to a preset pressure, so that the gas in the gas pipeline system is discharged through the pressure stabilizing and releasing valve, and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system; When the coal gas and the inert gas are fully mixed, controlling the inert gas regulating valve to make the system pressure of the gas pipeline system reach a first system pressure; When the system pressure of the gas pipeline system reaches a first system pressure, the two main relief valves are controlled to open and close alternately so that the system pressure of the gas pipeline system alternates between the first system pressure and a second system pressure; wherein the first system pressure is greater than the second system pressure.

2. The method according to claim 1, characterized in that The blast furnace gas main is provided with a main control valve, the preset pressure includes a first preset pressure, a second preset pressure and a third preset pressure, the gas pipeline system further includes a middle burner and a lower burner, and the blast furnace gas branch pipes corresponding to the middle burner and the lower burner are each provided with a plurality of pressure stabilizing and relief valves; After the boiler is shut down, regulating the pressure stabilizing relief valve and the inert gas regulating valve according to a preset pressure includes: After the boiler is shut down, the main control valve, the pressure stabilizing and relief valve corresponding to the lower burner, and the inert gas regulating valve are controlled according to the first preset pressure and the second preset pressure to stabilize the gas pipeline system at a small flow rate; The pressure-stabilizing relief valve and the inert gas regulating valve corresponding to the middle-level burner are controlled according to the third preset pressure to perform large-flow mixing on the gas pipeline system; wherein the first preset pressure is less than the second preset pressure, and the second preset pressure is less than the third preset pressure.

3. The method according to claim 2, characterized in that The main control valve includes a blast furnace gas quick-cut valve and a blast furnace gas butterfly valve. The main control valve, the pressure-stabilizing relief valve corresponding to the lower burner, and the inert gas regulating valve are controlled according to the first preset pressure and the second preset pressure, including: Open the blast furnace gas quick cut-off valve and close the blast furnace gas butterfly valve. When the blast furnace gas main is water-sealed, open the pressure-stabilizing relief valve corresponding to the lower burner. If the system pressure of the gas pipeline system reaches the first preset pressure, the inert gas regulating valve is opened, and the system pressure is stabilized at the second preset pressure by adjusting the opening of the inert gas regulating valve.

4. The method according to claim 2, characterized in that The controlling of the pressure stabilizing relief valve and the inert gas regulating valve corresponding to the middle burner according to the third preset pressure includes: The pressure stabilizing and relief valve corresponding to the middle burner is opened, the inert gas regulating valve is opened and controlled, and the system pressure is stabilized at the third preset pressure by adjusting the opening of the inert gas regulating valve.

5. The method according to claim 1, wherein The blast furnace gas main further includes an east blast furnace gas main and a west blast furnace gas main. The main relief valve includes a first main relief valve and a second main relief valve, and the first main relief valve is arranged on the east blast furnace gas main, and the second main relief valve is arranged on the west blast furnace gas main. The method of controlling the two main relief valves to open and close alternately includes: determining any one of the first master relief valve and the second master relief valve as a target master relief valve, and controlling the target master relief valve to open so as to reduce the system pressure of the gas pipeline system; When the system pressure drops to the second system pressure, the target master relief valve is closed to increase the system pressure; and when the system pressure rises to the second system pressure, the master relief valve that was not opened last time between the first and second master relief valves is determined as a new target master relief valve, and the new target master relief valve is controlled to open to reduce the system pressure of the gas pipeline system; Repeating the steps of closing the target master relief valve to increase the system pressure when the system pressure drops to the second system pressure, and determining the master relief valve that was not opened last time between the first master relief valve and the second master relief valve as a new target master relief valve when the system pressure rises to the second system pressure, and controlling the new target master relief valve to open to reduce the system pressure of the gas pipeline system.

6. The method according to claim 1, characterized in that The method further comprises: When the number of alternations between the two main relief valves reaches a preset number, obtaining the carbon monoxide content in the gas pipeline system; If the carbon monoxide content is less than the preset content, it is determined that the gas replacement is completed, and the control of the alternating opening and closing of the two main relief valves is stopped; If the carbon monoxide content is not less than the preset content, the two main relief valves are controlled to open and close alternately until the carbon monoxide content is less than the preset content.

7. A gas replacement device, characterized in that: Applicable to a gas pipeline system, the gas pipeline system includes a blast furnace gas main and a blast furnace gas branch pipe, the blast furnace gas main is provided with two main relief valves, the blast furnace gas branch pipe is provided with multiple pressure-stabilizing relief valves, the blast furnace gas main is also connected to an inert gas pipeline, and an inert gas regulating valve is provided on the pipeline connecting the blast furnace gas main and the inert gas pipeline; the device includes: a pressure stabilizing and releasing module, configured to control the pressure stabilizing and releasing valve and the inert gas regulating valve according to a preset pressure after the boiler is shut down, so that the gas in the gas pipeline system is discharged through the pressure stabilizing and releasing valve and the inert gas in the inert gas pipeline is fully mixed with the gas in the gas pipeline system after entering the gas pipeline system; The pressure stabilizing and releasing module is further configured to control the inert gas regulating valve so that the system pressure of the gas pipeline system reaches the first system pressure when the coal gas and the inert gas are fully mixed; The pressure-variable purge module is configured to control the two main relief valves to alternately open and close when the system pressure of the gas pipeline system reaches a first system pressure, so that the system pressure of the gas pipeline system alternates between the first system pressure and a second system pressure; wherein the first system pressure is greater than the second system pressure.

8. The device according to claim 7, characterized in that The blast furnace gas main comprises a main blast furnace gas main, a main control valve is provided on the main blast furnace gas main, the preset pressure comprises a first preset pressure, a second preset pressure and a third preset pressure, the gas pipeline system further comprises a middle burner and a lower burner, and a plurality of pressure stabilizing and releasing valves are provided on the blast furnace gas branch pipes corresponding to the middle burner and the lower burner; The pressure stabilizing and releasing module is further configured to, after the boiler is shut down, control the main control valve, the pressure stabilizing and releasing valve corresponding to the lower burner, and the inert gas regulating valve according to the first preset pressure and the second preset pressure, so as to perform a small-flow pressure relief on the gas pipeline system; and control the pressure stabilizing and releasing valve corresponding to the middle burner and the inert gas regulating valve according to the third preset pressure, so as to perform a large-flow pressure relief on the gas pipeline system; wherein the first preset pressure is lower than the second preset pressure, and the second preset pressure is lower than the third preset pressure.

9. A gas pipeline system, characterized in that: The invention comprises a blast furnace gas main pipe and a blast furnace gas branch pipe, wherein the blast furnace gas main pipe is provided with two main relief valves, and the blast furnace gas branch pipe is provided with multiple pressure-stabilizing relief valves. The blast furnace gas main pipe is also connected to an inert gas pipeline, and an inert gas regulating valve is provided on the pipeline connecting the blast furnace gas main pipe and the inert gas pipeline. The gas pipeline system also includes a controller, and the controller is used to implement the method described in any one of claims 1 to 6.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a controller, the method according to any one of claims 1 to 6 can be implemented.

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