Gas blast furnace smelting and combustion power generation combined management method and system

Abstract

The invention belongs to the field of metallurgical gas management and utilization, and relates to a gas blast furnace smelting and combustion power generation combined management method and system. In the low electricity price peak period and the normal period, under the condition that the smelting requirement is met, a part of coal gas is used for blast furnace smelting, and the remaining coal gas is stored; and in the peak period of electricity price, the stored gas is used for blast furnace smelting, and the rest gas is used for combustion power generation. Based on the combined management method, the combined management system comprises a gas main pipe, and the gas main pipe comprises a first gas supply branch connected with a blast furnace and a second gas supply branch connected with a gas generator set; gas storage equipment is arranged on the first gas supply branch, a gas bypass branch is arranged between an inlet and an outlet of the gas storage equipment, and the source of gas introduced into the blast furnace is switched by controlling opening and closing of the gas bypass branch. The coal gas resource is reasonably configured according to the electricity price structure of the industrial electricity, and the maximization of the coal gas value and the economic benefit of the iron and steel enterprise is realized.

Description

Technical Field

[0001] The invention belongs to the field of metallurgical gas management and utilization, and relates to a combined management method and system for gas blast furnace smelting and combustion power generation. Background Art

[0002] In industrial production, the steel industry occupies an important position, but it also faces challenges in energy efficiency and environmental protection. In particular, in my country, 90% of the steel industry adopts the blast furnace-converter long process production process, which relies heavily on fossil energy, especially coal. In this case, the transformation technology from carbon to hydrogen or other energy sources is difficult and costly, so the steel industry can only achieve low-carbon transformation by improving the utilization efficiency of existing coal gas resources and optimizing the energy structure.

[0003] As an important by-product in the steel production process, coal gas has various ways of comprehensive utilization, but the added value varies significantly. At present, in addition to the processes of hydrogen production from coke oven gas and liquefied natural gas (LNG), which have high added value, other utilization methods such as blast furnace gas, converter gas or mixed gas are mainly limited to being used as fuel gas or for gas steam combined cycle (CCPP) power generation, etc., and the added value of these utilization methods is relatively low. In recent years, the technology of using the chemical energy of coal gas and injecting it into the blast furnace as a reducing gas has gradually attracted attention. This technology can not only reduce the coke ratio of the blast furnace and improve the comprehensive utilization value of coal gas in the steel industry, but also has positive significance for reducing the carbon emissions of steel enterprises.

[0004] In addition, with the development of my country's power industry and the adjustment of electricity price structure, the time-of-use electricity price system has been implemented for industrial electricity consumption. In order to maximize the value and economic benefits of gas, how to match a better gas management method according to the electricity price structure of industrial electricity consumption has become an urgent problem to be solved. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method and system for joint management of gas blast furnace smelting and combustion power generation, so as to maximize the gas value and economic benefits of steel enterprises through reasonable allocation of gas resources.

[0006] To achieve the above-mentioned purpose, the present invention provides a joint management method for gas blast furnace smelting and combustion power generation. During the low-peak and normal periods of electricity prices, while meeting the smelting needs, a portion of the coal gas is used for blast furnace smelting, and the remaining coal gas is stored; during the peak period of electricity prices, the stored coal gas is used for blast furnace smelting, and the remaining coal gas is used for combustion power generation; wherein the amount of coal gas stored during the low-peak and normal periods of electricity prices meets the smelting gas consumption of the blast furnace during the peak period of electricity prices.

[0007] Optionally, during low-peak and normal electricity price periods, if the smelting demand is met, a portion of the coal gas is introduced into the blast furnace for blast furnace smelting, and the remaining coal gas is introduced into the gas storage equipment for storage in the form of low pressure or high pressure; during peak electricity price periods, the coal gas in the gas storage equipment is released and introduced into the blast furnace for blast furnace smelting, and the remaining coal gas is introduced into the gas generator set for combustion and power generation. Introducing into the gas storage equipment in the form of low pressure means that the coal gas pressure is less than 30kPa, and introducing into the gas storage equipment in the form of high pressure means that the coal gas pressure is greater than 0.50MPa.

[0008] Based on the above-mentioned coal gas blast furnace smelting and combustion power generation joint management method, the present invention also provides a coal gas blast furnace smelting and combustion power generation joint management system, the joint management system includes a gas main, the gas main includes a first gas supply branch connected to the blast furnace and a second gas supply branch connected to the gas generator set; wherein, a gas storage device is arranged on the first gas supply branch, and a gas bypass branch is arranged between the inlet and outlet of the gas storage device, and the source of gas entering the blast furnace is switched by controlling the opening and closing of the gas bypass branch.

[0009] Optionally, the gas bypass branch, the inlet section and outlet section of the gas storage device, the second gas supply branch and the inlet of the blast furnace are all provided with control valves for controlling the interruption of gas flow.

[0010] Optionally, the gas storage equipment is a low-pressure gas storage cabinet, and a gas compressor unit for pressurizing the low-pressure gas to form high-pressure gas is arranged between the low-pressure gas storage cabinet and the blast furnace; the gas bypass branch is a low-pressure gas bypass branch arranged between the inlet and outlet of the low-pressure gas storage cabinet.

[0011] Optionally, the design pressure of the low-pressure gas storage tank is greater than or equal to the design pressure of the gas pipeline network of the entire plant, and the operating pressure of the low-pressure gas storage tank is equal to the gas pipeline network pressure.

[0012] Optionally, the design temperature of the low-pressure gas storage tank is greater than or equal to 60°C.

[0013] Optionally, the gas storage equipment is a high-pressure gas storage tank, and the part of the first gas supply branch located in front of the inlet of the high-pressure gas storage cabinet is provided with a gas compression unit for pressurizing low-pressure gas to form high-pressure gas; the gas bypass branch is a high-pressure gas bypass branch arranged between the inlet and outlet of the high-pressure gas storage tank.

[0014] Optionally, the outlet pressure of the gas compressor unit is not less than 0.5 MPa, the outlet temperature is not greater than 90° C., and the design flow rate is greater than or equal to 150% of the injection flow rate.

[0015] Optionally, the design pressure of the high-pressure gas storage tank is equal to the design pressure of the gas compressor unit, and the design temperature of the high-pressure gas storage tank is not less than 90°C.

[0016] The beneficial effects of the present invention are:

[0017] The combined management method and system for gas blast furnace smelting and combustion power generation proposed in the present invention significantly improves the utilization efficiency and economic value of gas resources by intelligently allocating the use of gas between smelting and power generation.

[0018] Through market research and analysis, the present invention finds that using coal gas for power generation during the peak period of electricity prices can obtain higher economic benefits, while using coal gas for blast furnace smelting during the low period of electricity prices and peacetime is more effective. Therefore, when the electricity price is at a low point and in peacetime, while meeting the gas consumption of blast furnace smelting, a portion of the coal gas is stored, and the stored amount is equal to the amount of coal gas required for low-carbon smelting of the blast furnace during the peak period, and this portion of coal gas is released for blast furnace smelting during the peak period of electricity prices. The management method provided by the present invention not only ensures the continuity of blast furnace smelting, but also optimizes the use period of coal gas, realizes the optimal use of coal gas in different electricity price periods, and matches it with the price fluctuations of the electricity market. It not only helps enterprises reduce production costs and improve economic benefits, but also indirectly contributes to environmental protection by reducing the waste of fossil energy.

[0019] In addition, the joint management system proposed by the present invention ensures the stability and safety of the smelting and power generation process by accurately controlling the flow direction and pressure of coal gas. The gas storage equipment, coal gas bypass branch and control valve in the system enable the coal gas to be flexibly allocated under different needs, further improving the operating efficiency and response speed of the entire system.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 A schematic diagram of the structure of a gas blast furnace smelting and combustion power generation joint management system provided by the present invention;

[0023] Figure 2 A schematic diagram of the structure of a gas blast furnace smelting and combustion power generation joint management system provided in Example 1 of the present invention;

[0024] Figure 3 A schematic diagram of the structure of a gas blast furnace smelting and combustion power generation joint management system provided in Example 2 of the present invention.

[0025] Reference numerals:

[0026] 100-gas main; 110-first gas supply branch; 120-second gas supply branch; 200-gas storage equipment; 210-low-pressure gas storage cabinet; 220-high-pressure gas storage tank; 300-gas bypass branch; 310-low-pressure gas bypass branch; 320-high-pressure gas bypass branch; 400-control valve; 500-gas compressor unit; 600-blast furnace. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] According to the situation of my country's power industry, industrial electricity consumption is generally divided into three periods, namely peak period, normal period and valley period, each period is 8 hours, and different periods correspond to different electricity prices. In the steel industry, the value of coal gas used in blast furnace smelting is not divided by time period.

[0031] Take a steel company's blast furnace for 18000Nm 3 / h coke oven gas was used as a sample for analysis. The properties of the coke oven gas are shown in the following table:

[0032]

[0033] The peak electricity price for industrial electricity is 0.78 yuan / kwh, 0.59 yuan / kwh during normal times, and 0.39 yuan / kwh during off-peak times. The value of electricity generated by burning coke oven gas is converted according to the above electricity prices, which is 1.20 yuan / Nm 3 , 0.88 yuan / Nm in normal times 3 , low period 0.55 yuan / Nm 3 The value of coke oven gas used in blast furnace smelting is not divided into time periods, and the converted price is basically stable at 0.90 yuan / Nm 3 From the above data, it can be seen that during the peak period of electricity prices, the efficiency of coal gas for combustion power generation is higher, while during the valley period and normal period, the efficiency of coal gas for blast furnace smelting is higher. Therefore, the most favorable way to manage coal gas is: during the valley period of electricity prices and normal period, on the premise of meeting the gas consumption required for blast furnace smelting, a part of the coal gas is stored, and the amount of stored coal gas can meet the gas consumption required for blast furnace smelting during the peak period of electricity prices. During the peak period of electricity prices, the stored coal gas is released for blast furnace smelting, in order to maximize the value of coal gas and economic benefits.

[0034] Based on this, the present invention provides a method for joint management of gas blast furnace smelting and combustion power generation. Specifically, during the low-peak and normal periods of electricity prices, a portion of the coal gas is introduced into the blast furnace 600 for blast furnace smelting while meeting the smelting demand, and the remaining coal gas is introduced into the gas storage device 200 for storage in the form of low pressure or high pressure. During the peak period of electricity prices, the coal gas in the gas storage device 200 is released and introduced into the blast furnace 600 for blast furnace smelting, and the remaining coal gas is introduced into the coal gas generator set for combustion and power generation.

[0035] Based on the above-mentioned coal gas blast furnace smelting, combustion power generation joint management method, the present invention also provides a coal gas blast furnace smelting, combustion power generation joint management system, such as Figure 1 As shown, the joint management system includes a gas main 100, and the gas main 100 includes a first gas supply branch 110 connected to the blast furnace 600 and a second gas supply branch 120 connected to the gas generator set. A gas storage device 200 is arranged on the first gas supply branch 110, and a gas bypass branch 300 is arranged between the inlet and outlet of the gas storage device 200. The gas main 100, the gas bypass branch 300, the inlet section and outlet section of the gas storage device 200, the second gas supply branch 120 and the inlet of the blast furnace 600 are all provided with a control valve 400 for controlling the flow of gas. The source of gas entering the blast furnace 600 is switched by controlling the opening and closing of the gas bypass branch 300 and the opening and closing of the connecting pipeline between the gas storage device 200 and the blast furnace 600. Each control valve 400 is electrically controlled by remote transmission.

[0036] Furthermore, according to different types of gas storage equipment 200, the present invention provides two implementation methods: low-pressure gas storage and high-pressure gas storage.

[0037] Example 1

[0038] like Figure 2 As shown, the present invention adopts a low-pressure gas storage cabinet 210 as a gas storage device 200, and provides a joint management system for coal gas blast furnace smelting, combustion and power generation. Specifically, the coal gas main 100 is led out from the existing plant-wide official website and is divided into a first gas supply branch 110 leading to the blast furnace 600 and a second gas supply branch 120 leading to the coal gas generator set. A low-pressure gas storage cabinet 210 is provided on the first gas supply branch 110, and a coal gas compressor unit 500 for pressurizing low-pressure coal gas to form high-pressure coal gas is provided between the low-pressure gas storage cabinet 210 and the blast furnace 600. The coal gas compressor unit 500 has the ability to adjust the flow rate and outlet pressure. Furthermore, a low-pressure coal gas bypass branch 310 is also provided between the inlet and outlet of the low-pressure gas storage cabinet 210. Control valves 400 are provided at the outlets of the first gas supply branch 110 , the second gas supply branch 120 , the low-pressure gas bypass branch 310 , the low-pressure gas storage cabinet 210 , and the inlet of the blast furnace 600 .

[0039] During the low electricity price period and the peacetime period, the control valve 400 of the second gas supply branch 120 is closed, and the control valve 400 of the first gas supply branch 110 is opened, and all the coal gas is passed into the first gas supply branch 110 for smelting in the blast furnace 600. The control valve 400 on the low-pressure coal gas bypass branch 310 is opened, and the control valve 400 at the outlet of the low-pressure gas storage tank 210 is closed, so that part of the coal gas enters the low-pressure gas storage tank 210 for storage, and the remaining coal gas is transported to the coal gas compressor unit 500 through the low-pressure coal gas bypass branch 310, and is pressurized by the coal gas compressor unit 500 to form high-pressure coal gas, and then transported to the blast furnace 600 for blast furnace smelting. In this process, the coal gas used for smelting in the blast furnace 600 needs to meet the gas consumption required for blast furnace smelting in the current period, and the coal gas stored in the low-pressure gas storage tank 210 needs to meet the gas consumption required for blast furnace smelting during the peak electricity price period.

[0040] During the peak period of electricity price, the control valve 400 of the second gas supply branch 120 is opened, and the control valve 400 of the first gas supply branch 110 is closed, and all the coal gas is passed into the second gas supply branch 120 for combustion and power generation. The control valve 400 on the low-pressure coal gas bypass branch 310 is closed, and the control valve 400 at the outlet of the low-pressure gas storage tank 210 is opened to release the coal gas in the low-pressure gas storage tank 210. The low-pressure coal gas is transported to the coal gas compressor unit 500, and is pressurized by the coal gas compressor unit 500 to form high-pressure coal gas, and then transported to the blast furnace 600 for blast furnace smelting.

[0041] In some optional embodiments, the outlet pressure of the gas compressor unit 500 is not less than 0.5 MPa, the outlet temperature is not greater than 90°C, and the design flow rate is greater than or equal to 150% of the injection flow rate. The low-pressure gas storage tank 210 has a cylindrical shape in urban regulations, the design pressure of the low-pressure gas storage tank 210 is greater than or equal to the design pressure of the gas pipeline network of the entire plant, and the operating pressure of the low-pressure gas storage tank 210 is equal to the gas pipeline network pressure. The design temperature of the low-pressure gas storage tank 210 is greater than or equal to 60°C.

[0042] Based on the joint management system provided in this embodiment, the amount of coke oven gas required for blast furnace smelting per hour is 18000Nm 3 / h is the data sample for analysis. The volume of the low-pressure gas storage tank needs to meet the gas consumption required for blast furnace smelting during the peak electricity price period (8 hours), that is, 144,000 Nm 3 , it is necessary to build 150,000 m 3 Low-pressure gas storage tank. When the electricity price is low or in peacetime, the gas flow on the first gas supply branch is adjusted to 27000Nm 3 / h, of which 18000Nm 3 / h gas is pressurized by the gas compressor unit and sent to the blast furnace injection system, 9000Nm 3 / h of coal gas is stored in low-pressure gas storage tanks. During the peak period of electricity prices, the first gas supply branch is closed, and the coal gas released from the low-pressure gas storage tank is pressurized by the gas compressor unit and used for blast furnace smelting. According to preliminary calculations, the annual revenue is increased by about 19.5 million yuan. The use of coal gas for blast furnace smelting and combustion power generation combined cycle reduces the investment payback period by 1 year compared with pure blast furnace smelting, and the economic benefits are good.

[0043] Example 2

[0044] like Figure 3 As shown, the present invention adopts a high-pressure gas storage tank as a gas storage device, and provides a gas blast furnace smelting, combustion and power generation joint management system. Specifically, the gas main 100 is drawn from the existing plant-wide official website and is divided into a first gas supply branch 110 leading to the blast furnace 600 and a second gas supply branch 120 leading to the gas generator set. A high-pressure gas storage tank 220 is arranged on the first gas supply branch 110, and a gas compressor unit 500 for pressurizing low-pressure coal gas to form high-pressure coal gas is arranged in the first gas supply branch 110 located in front of the inlet of the high-pressure gas storage tank 220. The gas compressor unit 500 has the ability to adjust the flow rate and outlet pressure. Further, a high-pressure coal gas bypass branch 320 is also arranged between the inlet and outlet of the high-pressure gas storage tank 220. A control valve 400 is arranged at the first gas supply branch 110, the second gas supply branch 120, the high-pressure coal gas bypass branch 320, the inlet and outlet of the high-pressure gas storage tank 220, and the inlet of the blast furnace 600.

[0045] During the low electricity price period and peacetime, the control valve 400 of the second gas supply branch 120 is closed, and the control valve 400 of the first gas supply branch 110 is opened, and all the coal gas is passed into the first gas supply branch 110 for smelting in the blast furnace 600. The control valve 400 on the high-pressure coal gas bypass branch 320 and the control valve 400 at the inlet of the high-pressure gas storage tank 220 are opened, and the control valve 400 at the outlet of the high-pressure gas storage tank 220 is closed. A part of the high-pressure coal gas formed after pressurization by the coal gas compressor unit 500 enters the high-pressure gas storage tank 220 for storage, and the remaining coal gas is transported to the blast furnace 600 through the high-pressure coal gas bypass branch 320 for blast furnace smelting. In this process, the coal gas used for smelting in the blast furnace 600 needs to meet the gas consumption required for blast furnace smelting in the current period, and the coal gas stored in the high-pressure gas storage tank 220 needs to meet the gas consumption required for blast furnace smelting during the peak electricity price period.

[0046] During the peak period of electricity price, the control valve 400 of the second gas supply branch 120 is opened, and the control valve 400 of the first gas supply branch 110 is closed, and all the coal gas is passed into the second gas supply branch 120 for combustion and power generation. The control valve 400 on the high-pressure gas bypass branch 320 is closed, and the control valve 400 at the outlet of the high-pressure gas storage tank 220 is opened to release the coal gas in the high-pressure gas storage tank 220, and the high-pressure coal gas is transported to the blast furnace 600 for blast furnace smelting.

[0047] In some optional embodiments, the outlet pressure of the gas compressor unit 500 is not less than 0.5 MPa, the outlet temperature is not greater than 90°C, and the design flow rate is greater than or equal to 150% of the injection flow rate. The high-pressure gas storage tank 220 has a spherical shape. The design pressure of the high-pressure gas storage tank 220 is greater than or equal to the design pressure of the gas pipeline network of the entire plant, and the operating pressure of the high-pressure gas storage tank 220 is equal to the gas pipeline network pressure. The design temperature of the high-pressure gas storage tank 220 is greater than or equal to 60°C.

[0048] Based on the joint management system provided in this embodiment, the amount of coke oven gas required for blast furnace smelting per hour is 18000Nm 3 / h is the data sample for analysis. The volume of the high-pressure gas storage tank needs to meet the gas consumption required for blast furnace smelting during the peak electricity price period (8 hours), that is, 144,000 Nm 3 , 144,000 Nm 3 Gas requires construction of 25,000 m 3 When the electricity price is low or in peacetime, the gas flow on the first gas supply branch is adjusted to 27000Nm 3 / h, of which 18000Nm 3 / h gas is pressurized by the gas compressor unit and sent to the blast furnace injection system, 9000Nm 3 / h of coal gas is stored in high-pressure gas tanks. During peak electricity prices, the first gas supply branch is closed, and the coal gas released from the high-pressure gas tank is pressurized by the gas compressor unit and used for blast furnace smelting. According to preliminary calculations, the annual revenue is increased by about 19.5 million yuan. The use of coal gas for blast furnace smelting and combustion power generation combined cycle reduces the investment payback period by 1 year compared with pure blast furnace smelting, and the economic benefits are good.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A combined management method for gas blast furnace smelting and combustion power generation, characterized in that: During the low-peak and normal electricity price periods, a portion of the coal gas is used for blast furnace (600) smelting while meeting the smelting demand, and the remaining coal gas is stored; During the peak period of electricity price, the stored gas is used for blast furnace (600) smelting, and the remaining gas is used for combustion to generate electricity; The amount of coal gas stored during the low-peak period and normal period of electricity price can meet the smelting gas consumption of the blast furnace (600) during the peak period of electricity price.

2. The joint management method according to claim 1, characterized in that: During the low-peak and normal periods of electricity prices, a portion of the coal gas is introduced into the blast furnace (600) for blast furnace smelting while meeting the smelting demand, and the remaining coal gas is introduced into the gas storage device (200) in the form of low pressure or high pressure for storage; wherein, introducing the coal gas into the gas storage device (200) in the form of low pressure means that the coal gas pressure is less than 30 kPa, and introducing the coal gas into the gas storage device (200) in the form of high pressure means that the coal gas pressure is greater than 0.50 MPa; During the peak period of electricity prices, the coal gas in the gas storage device (200) is released and introduced into the blast furnace (600) for blast furnace smelting, and the remaining coal gas is introduced into the coal gas generator set for combustion and power generation.

3. A coal gas blast furnace smelting and combustion power generation joint management system, using the joint management method of claim 1 or 2, characterized in that: The joint management system comprises a gas main (100), wherein the gas main (100) comprises a first gas supply branch (110) connected to a blast furnace (600) and a second gas supply branch (120) connected to a gas generator set; wherein: A gas storage device (200) is provided on the first gas supply branch (110), and a gas bypass branch (300) is provided between the inlet and outlet of the gas storage device (200). The source of gas introduced into the blast furnace (600) is switched by controlling the opening and closing of the gas bypass branch (300).

4. The joint management system according to claim 3, characterized in that: The gas bypass branch (300), the inlet section and outlet section of the gas storage device (200), the second gas supply branch (120) and the inlet of the blast furnace (600) are all provided with a control valve (400) for controlling the interruption of gas flow.

5. The joint management system according to claim 3, characterized in that: The gas storage device (200) is a low-pressure gas storage tank (210), and a gas compressor unit (500) for pressurizing low-pressure gas to form high-pressure gas is arranged between the low-pressure gas storage tank (210) and the blast furnace (600); the gas bypass branch (300) is a low-pressure gas bypass branch (310) arranged between the inlet and outlet of the low-pressure gas storage tank (210).

6. The joint management system according to claim 5, characterized in that: The design pressure of the low-pressure gas storage tank (210) is greater than or equal to the design pressure of the gas pipeline network of the entire plant, and the operating pressure of the low-pressure gas storage tank (210) is equal to the pressure of the gas pipeline network.

7. The joint management system according to claim 5, characterized in that: The design temperature of the low-pressure gas storage cabinet (210) is greater than or equal to 60°C.

8. The joint management system according to claim 3, characterized in that: The gas storage device (200) is a high-pressure gas storage tank (220); the first gas supply branch (110) is provided with a gas compressor unit (500) for pressurizing low-pressure gas to form high-pressure gas at a portion located in front of the inlet of the high-pressure gas storage cabinet; the gas bypass branch (300) is a high-pressure gas bypass branch (320) provided between the inlet and outlet of the high-pressure gas storage tank (220).

9. The joint management system according to claim 8, characterized in that: The outlet pressure of the coal gas compressor unit (500) is not less than 0.5 MPa, the outlet temperature is not greater than 90°C, and the design flow rate is greater than or equal to 150% of the injection flow rate.

10. The joint management system according to claim 9, characterized in that: The design pressure of the high-pressure gas storage tank (220) is equal to the design pressure of the coal gas compressor unit (500), and the design temperature of the high-pressure gas storage tank (220) is not less than 90°C.

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