Control system and method for reducing converter gas emission

Abstract

The invention belongs to the technical field of converter steelmaking, and discloses a control system and method for reducing converter gas emission. The fan room is provided with a plurality of three-way valves, and any three-way valve is respectively communicated with the air inlet ends of the fan room, the diffusion tower and the converter gas holder; the gas outlet end of the converter gasholder is communicated with the inlet end of the pressurizing machine through a gas supply pipeline; the outlet end of the pressurizing machine is communicated with the converter gas header pipe and the blast furnace gas header pipe; the recovery pipeline is communicated with the gas supply pipeline through a first communicating pipe, and the converter gas header pipe is communicated with the first communicating pipe through a second communicating pipe; the recovery pipeline is provided with an air inlet valve, the air supply pipeline is provided with an air supply valve, the first communicating pipe is provided with a first pressure gauge and a first adjusting valve, the second communicating pipe is provided with a second adjusting valve, a first external supply valve is arranged at the position, close to the pressurizing machine, of the converter gas main pipe, and a second external supply valve is arranged at the position, close to the pressurizing machine, of the blast furnace gas main pipe. The utilization rate of converter gas can be effectively increased, and resource waste and environmental pollution are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of converter steelmaking, in particular to a control system and method for reducing converter gas emission. BACKGROUND

[0002] Converter steelmaking has become the mainstream technology in current steelmaking production due to its technical advantages of short smelting cycle, low cost and high efficiency.

[0003] Converter gas produced in converter steelmaking is a common byproduct, which can be applied to industrial furnaces, boilers, steel rolling heating furnaces, etc. due to its high heat. Considering the discontinuity of converter gas production, i.e. converter gas is only produced during specific steelmaking production, a converter gas tank is usually provided in the prior art to collect the indirectly produced converter gas for re-use in specific steelmaking production of the converter, so as to solve the problem that intermittent recovery of converter gas cannot match continuous gas supply in the production process.

[0004] However, in actual application, the converter gas tank needs to be regularly shut down for maintenance to ensure production safety. During the maintenance of the converter gas tank, it is in a disabled state, which leads to ineffective recovery of converter gas produced during this period and can only be emitted, resulting in energy waste and environmental pollution. SUMMARY

[0005] The present application aims to provide a control system and method for reducing converter gas emission to solve the technical problem of ineffective collection and utilization of converter gas during maintenance of the converter gas tank in the prior art, which leads to energy waste and environmental pollution.

[0006] To achieve the above-mentioned purpose, the present application proposes the following technical solutions: In a first aspect, a control system for reducing converter gas emission is provided, comprising a fan house, an emission tower, a converter gas tank and a pressurizing machine which are connected to each other based on corresponding pipelines. A plurality of three-way valves are arranged at the outlet of the fan house, the first end of any three-way valve is connected to the fan house, the second end is connected to the emission tower, and the third end is connected to the gas inlet end of the converter gas tank through a recovery pipeline; the outlet end of the converter gas tank is connected to the inlet end of the pressurizing machine through a gas supply pipeline, and the outlet end of the pressurizing machine is connected to the converter gas main pipe and the blast furnace gas main pipe; the recovery pipeline and the gas supply pipeline are connected through a first communication pipe, and the converter gas main pipe and the first communication pipe are connected through a second communication pipe. The recovery pipeline is provided with an air inlet valve near the air inlet end of the converter gas tank, the gas supply pipeline is provided with a gas supply valve near the outlet end of the converter gas tank, the first connecting pipeline is provided with a first pressure gauge and a first regulating valve, the second connecting pipeline is provided with a second regulating valve, the converter gas main pipeline is provided with a first external supply valve near the pressurizing machine, and the blast furnace gas main pipeline is provided with a second external supply valve near the pressurizing machine.

[0007] Further, an electric dust collector is arranged, and the inlet and outlet of the electric dust collector are connected with the gas supply pipeline and the pressurizing machine respectively.

[0008] Further, a non-dust-removal pipeline is arranged, and the two ends of the non-dust-removal pipeline are connected with the inlet and outlet of the electric dust collector respectively; and a dust removal control valve is arranged on the non-dust-removal pipeline.

[0009] Further, a non-pressurizing pipeline is arranged, and the two ends of the non-pressurizing pipeline are connected with the inlet end and the outlet end of the pressurizing machine respectively; and a pressurizing control valve is arranged on the non-pressurizing pipeline.

[0010] Further, a mixing station connecting pipeline is arranged, one end of the mixing station connecting pipeline is connected with the outlet end of the pressurizing machine, and the other end is connected with the blast furnace gas main pipeline.

[0011] Further, a second pressure gauge and a third pressure gauge are arranged, the second pressure gauge is arranged on the mixing station connecting pipeline, and the third pressure gauge is arranged on the blast furnace gas main pipeline.

[0012] Further, a fourth pressure gauge is arranged, and the fourth pressure gauge is arranged on the converter gas main pipeline.

[0013] In the second aspect, a control method for reducing converter gas emission is provided, which is realized based on the control system, and comprises the following steps: When the converter gas meets the recovery condition, the corresponding three-way valve is turned to the recovery pipeline direction; wherein, the second external supply valve is set to be in an open state; The converter gas generated in the converter steelmaking process is sequentially introduced into the blast furnace gas main pipeline through the fan room, the recovery pipeline, the first connecting pipeline and the pressurizing machine; Wherein, the first real-time pressure value of the first pressure gauge is acquired in real time, when the first real-time pressure value is higher than the pressure upper limit value, the pressurizing machine is adjusted to increase the real-time load value until the first real-time pressure value is not higher than the pressure upper limit value; wherein, when the real-time load value of the pressurizing machine reaches the highest load threshold value, but the first real-time pressure value is still higher than the pressure upper limit value, the corresponding three-way valve is turned to the emission tower direction until the first real-time pressure value is not higher than the pressure upper limit value. Conversely, if it is determined that the first real-time pressure value is lower than the lower pressure limit, the compressor is adjusted to reduce its real-time load value until the first real-time pressure value is not lower than the lower pressure limit value; wherein, when the real-time load value of the compressor reaches the minimum load threshold, but the first real-time pressure value is still lower than the lower pressure limit value, the second regulating valve is opened to allow external converter gas to flow in until the first real-time pressure value is not lower than the lower pressure limit value.

[0014] Furthermore, including: When it is determined that the second real-time pressure value of the second pressure gauge is lower than the third real-time pressure value of the third pressure gauge, the press is adjusted to increase its real-time load value until the second real-time pressure value is not lower than the third real-time pressure value.

[0015] Furthermore, including: Upon receiving the maintenance completion command, when the converter gas meets the recovery conditions, turn the corresponding three-way valve to the recovery pipeline direction, close the first regulating valve, the second regulating valve, and the second external supply valve; at the same time, open the gas inlet valve. The converter gas generated during the converter steelmaking process is sequentially stored in the converter gas holder through the blower room and the recovery pipeline. The converter gas supply command is obtained to open the gas supply valve and the first external supply valve, and the converter gas in the converter gas holder is fed into the converter gas main pipe through the compressor, and finally used for converter steelmaking.

[0016] Beneficial effects: As can be seen from the above technical solutions, the technical solution of the present invention provides a control system for reducing converter gas emissions, so as to avoid environmental pollution and energy waste by improving the recovery and utilization rate of converter gas.

[0017] The control system includes a fan room, a venting tower, a converter gas holder, and a compressor, all interconnected by corresponding pipelines. The fan room outlet is equipped with several three-way valves. The first end of any three-way valve is connected to the fan room, the second end to the venting tower, and the third end to the inlet of the converter gas holder via a recovery pipeline. The outlet of the converter gas holder is connected to the inlet of the compressor via a gas supply pipeline. The outlet of the compressor is simultaneously connected to both the converter gas main and the blast furnace gas main. The recovery pipeline and the gas supply pipeline are connected via a first connecting pipe, and the converter gas main and the first connecting pipe are connected via a second connecting pipe. An inlet valve is installed near the gas inlet end of the recovery pipeline and near the gas outlet end of the converter gas holder. A first pressure gauge and a first regulating valve are installed on the first connecting pipe, and a second regulating valve is installed on the second connecting pipe. A first external supply valve is installed near the compressor of the converter gas main pipe, and a second external supply valve is installed near the compressor of the blast furnace gas main pipe.

[0018] During normal operation of the converter gas holder, converter gas is stored in the holder via appropriate valves, ready to be supplied to the steelmaking converter via the main converter gas pipe when needed. During converter gas holder maintenance, the gas can be directly supplied to gas-fired power plants, heating furnaces, and other equipment with low calorific value requirements via appropriate valves. Considering the safety hazards caused by pressure fluctuations due to intermittent gas supply (e.g., low pressure in the first connecting pipe can lead to air ingress, potentially causing pipe flattening and deformation; high pressure can cause excessive fan resistance in the blower room, making external gas delivery difficult), the pressure in the first connecting pipe is also linked to the compressor load, the venting effect of the venting tower, and the supplementary function of the main converter gas pipe via appropriate valves. This allows for pressure reduction via the compressor and venting tower when pressure is too high, and pressure increase via the compressor and main converter gas pipe when pressure is too low.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0022] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the control system for reducing converter gas emissions as described in this embodiment; Figure 2 This is a flowchart of the control method for reducing converter gas venting described in this embodiment.

[0023] The attached diagram is labeled as follows: 1 is the blower room, 2 is the recovery pipeline, 3 is the converter gas holder, 4 is the gas supply pipeline, 5 is the electrostatic precipitator, 6 is the compressor, 7 is the converter gas main pipe, 8 is the inlet valve, 9 is the gas supply valve, 10 is the mixing station connecting pipe, 11 is the second external supply valve, 12 is the blast furnace gas main pipe, 13 is the three-way valve, 14 is the venting tower, 15 is the first connecting pipe, 16 is the first regulating valve, 17 is the first pressure gauge, 18 is the second connecting pipe, 19 is the second regulating valve, and 20 is the first external supply valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0025] The terms "first," "second," and similar words used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Converter gas is a byproduct generated during converter steelmaking. Due to its high calorific value, it can be used alone or mixed with other types of gas in industrial furnaces, boilers, rolling mill heating furnaces, and other equipment. Since converter steelmaking is an intermittent process, the generation of converter gas is also intermittent. Therefore, converter gas holders are typically used in the converter gas recovery and reuse process to balance the conflict between intermittent recovery and continuous external supply. However, converter gas holders require periodic shutdowns for major overhauls, during which time converter gas cannot be recovered and must be released, leading to energy waste and environmental pollution. Therefore, this embodiment aims to provide a control system for reducing converter gas release to solve the technical problem of the inability to effectively improve converter gas recovery rates in existing technologies.

[0027] The control system for reducing converter gas emissions described in this embodiment will be specifically described below with reference to the accompanying drawings.

[0028] This embodiment is applicable to steel enterprises with multiple converter gas holders located in different areas, whose inlet pipelines are not connected due to distance. Combined with... Figure 1As shown, the system includes a blower room 1, a venting tower 14, a converter gas holder 3, and a compressor 6; these components are interconnected via corresponding pipelines to achieve coordinated operation. The blower room 1 is used to acquire and release converter gas generated during the converter steelmaking process; the venting tower 14 is used to directly release the converter gas into the external environment; the converter gas holder 3 is used to collect and store the converter gas; and the compressor 6 is used to pressurize the exported converter gas. Preferably, the system also includes an electrostatic precipitator 5 to remove dust, particulate matter, and other solid particles carried by the exported converter gas.

[0029] Specifically, several three-way valves 13 are installed at the outlet of the blower room 1. The first end of any three-way valve 13 is connected to the blower room 1, the second end is connected to the venting tower 14, and the third end is connected to the inlet of the converter gas holder 3 through the recovery pipe 2. The outlet of the converter gas holder 3 is connected to the inlet of the compressor 6 through the gas supply pipe 4. Specifically, when the electrostatic precipitator 5 is installed, the gas supply pipe 2 and the inlet of the compressor 6 are connected through the electrostatic precipitator 5. The outlet of the compressor 6 is simultaneously connected to the converter gas main pipe 7 and the blast furnace gas main pipe 12. The recovery pipe 2 and the gas supply pipe 4 are connected through the first connecting pipe 15, and the converter gas main pipe 7 and the first connecting pipe 15 are connected through the second connecting pipe 18.

[0030] Meanwhile, an inlet valve 8 is installed at the inlet end of the recovery pipe 2 near the converter gas holder 3, and a supply valve 9 is installed at the outlet end of the supply pipe 4 near the converter gas holder 3. A first pressure gauge 17 and a first regulating valve 15 are installed on the first connecting pipe 15, and a second regulating valve 19 is installed on the second connecting pipe 18. A first external supply valve 20 is installed on the converter gas main pipe 7 near the compressor 6, and a second external supply valve 11 is installed on the blast furnace gas main pipe 12 near the compressor 6. In this embodiment, a mixing station connecting pipe 10 is also included, with one end connected to the outlet end of the compressor 6 and the other end connected to the blast furnace gas main pipe 12. In this case, the second external supply valve 11 is specifically located on the mixing station connecting pipe 10 near the compressor 6.

[0031] In practice, if the converter gas holder 3 is operating normally, the three-way valve 13 is turned to the direction of the recovery pipe 2, and the inlet valve 8 is opened to allow the converter gas in the blower room 1 to be stored in the converter gas holder 3 via the recovery pipe 2. During the converter steelmaking process, the gas supply valve 9 is opened to transport the converter gas in the converter gas holder 3 to the steelmaking converter via the gas supply pipe 4, the electrostatic precipitator 5, the compressor 6, and the converter gas main pipe 7.

[0032] During the maintenance phase of the converter gas holder, the inlet valve 8 and the supply valve 9 can be closed to isolate the converter gas holder 3 (in actual operation, this may also include blocking the blind plate, sealing the water seal, or closing the gate valve, etc.); and the first external supply valve 20 should be closed. At the same time, the first regulating valve 16 should be opened. At this time, the converter gas is directly supplied to gas-fired power plants, heating furnaces, and other equipment with low calorific value requirements through the first regulating valve 16, the compressor 6, the mixing station connecting pipe 10, and the blast furnace gas main pipe 11. Furthermore, considering the pressure changes caused by intermittent gas supply, and the resulting safety hazards (such as low pressure in the first connecting pipe leading to air ingress, which in severe cases can cause the pipe to flatten and deform; high pressure leading to excessive fan resistance in the fan room and difficulty in external gas delivery), the pressure value in the first connecting pipe is also linked to the load value of the compressor, the venting effect of the venting tower, and the supplementary effect of the converter gas main pipe through corresponding valve control. This allows for pressure reduction through the compressor and venting tower when the pressure is too high, and pressure increase through the converter gas main pipe when the pressure is too low.

[0033] As a specific implementation method, considering the application requirements in different scenarios, this embodiment also includes a non-dust-removing pipeline, the two ends of which are connected to the inlet and outlet of the electrostatic precipitator 5, respectively; and a dust removal control valve is installed on the non-dust-removing pipeline. In this case, the electrostatic precipitator 5 can be tripped by opening the dust removal control valve. Similarly, a non-pressurized pipeline is also included, the two ends of which are connected to the inlet and outlet of the pressurizer 6, respectively; and a pressurization control valve is installed on the non-pressurized pipeline. In this case, the pressurizer 6 can be tripped by opening the pressurization control valve.

[0034] As a preferred embodiment, considering the safety of the converter gas supply process, a second pressure gauge and a third pressure gauge are also provided. The second pressure gauge is installed on the mixing station connecting pipe 10, and the third pressure gauge is installed on the blast furnace gas main pipe 12. In this case, the pressure in the mixing station connecting pipe 10 and the blast furnace gas main pipe 12 can be monitored in real time using the second and third pressure gauges to ensure that the pressure value in the mixing station connecting pipe 10 is higher than the pressure value in the blast furnace gas main pipe 12.

[0035] Similarly, the system also includes a fourth pressure gauge, which is installed on the converter gas main pipe 7 to monitor the pressure value inside in real time.

[0036] In summary, the control system provided in this embodiment can adjust its functions according to different application stages of the converter gas holder to ensure effective recovery of converter gas in any state of the gas holder. Simultaneously, considering the safety of the recovery process during maintenance, interlocking control is implemented based on the connectivity between various equipment and pipelines to ensure both high recovery rates and the safety of converter gas reuse. Based on this control system, taking a 3*180t converter with a 120,000 m³ converter gas holder as an example, at least 40 million m³ of gas can still be recovered during a 30-day maintenance period, generating approximately 15 million yuan in benefits.

[0037] Based on the above control system, this embodiment also discloses a control method for reducing converter gas venting.

[0038] The control method for reducing converter gas emissions described in this embodiment will be specifically introduced below with reference to the accompanying drawings.

[0039] Combination Figure 2 As shown, the method includes: Step 202: Obtain maintenance instructions, close the inlet valve and the supply valve to isolate the converter gas holder, close the first external supply valve to isolate the converter gas main pipe; at the same time, open the first regulating valve, and when the converter gas meets the recovery conditions, turn the corresponding three-way valve to the recovery pipeline direction; set the second external supply valve to the normally open state.

[0040] Step S204: The converter gas generated during the converter steelmaking process is sequentially fed into the blast furnace gas main pipe through the blower room, the recovery pipeline, the first connecting pipe, and the compressor.

[0041] In the specific implementation of step 204, interlocking control is performed in the following manner: Step S20402: Obtain the first real-time pressure value of the first pressure gauge in real time. If the first real-time pressure value is higher than the pressure upper limit, adjust the press to increase its real-time load value until the first real-time pressure value is not higher than the pressure upper limit. Wherein, when the real-time load value of the press reaches the maximum load threshold, but the first real-time pressure value is still higher than the pressure upper limit, turn the corresponding three-way valve to the venting tower direction until the first real-time pressure value is not higher than the pressure upper limit.

[0042] Step S20404: When it is determined that the first real-time pressure value is lower than the lower pressure limit, the compressor is adjusted to reduce its real-time load value until the first real-time pressure value is not lower than the lower pressure limit value; wherein, when the real-time load value of the compressor reaches the minimum load threshold, but the first real-time pressure value is still lower than the lower pressure limit value, the second regulating valve is opened to allow external converter gas to flow in until the first real-time pressure value is not lower than the lower pressure limit value.

[0043] In this embodiment, the normal range of the first pressure gauge is 2 kPa to 4 kPa. The upper pressure limit is specifically 4.5 kPa, and the lower pressure limit is specifically 1.5 kPa. At this time, the pressure of the first connecting pipe can be ensured to be within the limited range through the interlocking control of the compressor, the converter gas main, and the venting tower.

[0044] Meanwhile, as a preferred implementation, considering that the pressure of the mixing station connecting pipe needs to be higher than that of the blast furnace gas main pipe to ensure the smooth external supply of converter gas, it also includes: Step S20422: When it is determined that the second real-time pressure value of the second pressure gauge is lower than the third real-time pressure value of the third pressure gauge, the pressurizer is adjusted to increase its real-time load value until the second real-time pressure value is not lower than the third real-time pressure value.

[0045] At this point, step S20422 can effectively ensure the smooth supply of converter gas to the corresponding user equipment.

[0046] Specifically, after the converter gas holder undergoes maintenance, the direct gas supply is cut off to store the converter gas inside the gas holder. This includes: Step S206: Obtain the maintenance end command. When the converter gas meets the recovery conditions, turn the corresponding three-way valve to the recovery pipeline direction, close the first regulating valve, the second regulating valve and the second external supply valve; at the same time, open the gas inlet valve.

[0047] Step S208: The converter gas generated during the converter steelmaking process is sequentially stored in the converter gas holder through the blower room and the recovery pipeline.

[0048] Step S210: Obtain the converter gas supply command to open the gas supply valve and the first external supply valve, and pump the converter gas in the converter gas holder into the converter gas main pipe through the compressor, and finally apply it to converter steelmaking.

[0049] In summary, this embodiment can adaptively adjust the application status of converter gas based on command control to ensure that the converter gas holder can effectively recover and reuse converter gas under any circumstances. It also effectively guarantees the application safety during the recovery and reuse process.

[0050] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A control system for reducing converter gas blow-off, characterized by, The fan room, the diffusion tower, the converter gas tank and the pressurizing machine are connected with each other through corresponding pipelines; A plurality of three-way valves are arranged at the outlet of the fan room, the first end of any three-way valve is connected with the fan room, the second end is connected with the diffusion tower, and the third end is connected with the gas inlet end of the converter gas tank through a recovery pipeline; the outlet end of the converter gas tank is connected with the inlet end of the pressurizing machine through a gas supply pipeline, and the outlet end of the pressurizing machine is connected with the converter gas main pipe and the blast furnace gas main pipe; the recovery pipeline and the gas supply pipeline are connected with each other through a first communication pipe, and the converter gas main pipe and the first communication pipe are connected with each other through a second communication pipe; An air inlet valve is arranged at the air inlet end of the converter gas tank close to the recovery pipeline, a gas supply valve is arranged at the outlet end of the converter gas tank close to the gas supply pipeline, a first pressure gauge and a first regulating valve are arranged on the first communication pipe, a second regulating valve is arranged on the second communication pipe, a first external supply valve is arranged on the converter gas main pipe close to the pressurizing machine, and a second external supply valve is arranged on the blast furnace gas main pipe close to the pressurizing machine.

2. The control system for reducing the blowdown of converter gas according to claim 1, characterized in that, The electric dust collector is connected with the gas supply pipeline and the pressurizing machine through an inlet and an outlet, respectively.

3. The control system for reducing the blowdown of converter gas according to claim 2, characterized in that, The non-dust-removal pipeline is connected with the inlet and the outlet of the electric dust collector through two ends, and a dust removal control valve is arranged on the non-dust-removal pipeline.

4. The control system for reducing the blowdown of converter gas of claim 1, wherein, The non-pressurizing pipeline is connected with the inlet end and the outlet end of the pressurizing machine through two ends, and a pressurizing control valve is arranged on the non-pressurizing pipeline.

5. The control system for reducing the blowdown of converter gas of claim 1, wherein, The mixing station communication pipe is connected with the outlet end of the pressurizing machine at one end and connected with the blast furnace gas main pipe at the other end.

6. The control system for reducing the blowdown of converter gas of claim 5, wherein, The second pressure gauge is arranged on the mixing station communication pipe, and the third pressure gauge is arranged on the blast furnace gas main pipe.

7. The control system for reducing the blowdown of converter gas of claim 1, wherein, The fourth pressure gauge is arranged on the converter gas main pipe.

8. A control method for reducing converter gas blow-off, characterized by, The control system is realized based on any one of claims 1 to 7, comprising: The maintenance instruction is obtained, the air inlet valve and the gas supply valve are closed to isolate the converter gas tank, the first regulating valve is opened, and when the converter gas meets the recovery condition, the corresponding three-way valve is turned to the recovery pipeline direction; wherein the second external supply valve is in a normally open state; The converter gas generated in the converter steelmaking process is sequentially introduced into the blast furnace gas main pipe through the fan room, the recovery pipeline, the first communication pipe and the pressurizing machine; The first real-time pressure value of the first pressure gauge is obtained in real time, and when the first real-time pressure value is higher than the pressure upper limit value, the pressurizing machine is adjusted to increase the real-time load value until the first real-time pressure value is not higher than the pressure upper limit value; wherein when the real-time load value of the pressurizing machine reaches the highest load threshold value, but the first real-time pressure value is still higher than the pressure upper limit value, the corresponding three-way valve is turned to the diffusion tower direction until the first real-time pressure value is not higher than the pressure upper limit value; Conversely, when the first real-time pressure value is determined to be lower than the lower pressure limit value, the pressurizing machine is adjusted to reduce its real-time load value until the first real-time pressure value is not lower than the lower pressure limit value; wherein when the real-time load value of the pressurizing machine reaches the minimum load threshold value but the first real-time pressure value is still lower than the lower pressure limit value, the second regulating valve is opened to make external converter gas flow in until the first real-time pressure value is not lower than the lower pressure limit value.

9. The control method for reducing the blowdown of converter gas according to claim 8, characterized in that, The method comprises: When the second real-time pressure value of the second pressure gauge is determined to be lower than the third real-time pressure value of the third pressure gauge, the pressurizing machine is adjusted to increase its real-time load value until the second real-time pressure value is not lower than the third real-time pressure value.

10. The control method for reducing the blowdown of converter gas according to claim 8, characterized in that, The method comprises: When the converter gas meets the recovery condition, a corresponding three-way valve is turned to the recovery pipeline direction, the first regulating valve, the second regulating valve and the second external supply valve are closed, and the air inlet valve is opened; Converter gas generated in the converter steelmaking process is sequentially stored in the converter gas tank through the fan room and the recovery pipeline; When a converter gas supply instruction is obtained, the gas supply valve and the first external supply valve are opened, the converter gas in the converter gas tank is made to flow into the converter gas main pipeline through the pressurizing machine, and finally applied to the converter steelmaking.

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