Online spray gun replacing equipment device for blast furnace gas spray cooling system

Abstract

The utility model provides an online spray gun replacement device for a blast furnace gas spray cooling system, which comprises a spray gun body, a spray gun barrel, a spray gun mounting assembly, an isolating valve and a gas sealing device hand hole pipe, gas sealing in the online spray gun replacement process is realized through the isolating valve and the gas sealing device hand hole pipe, gas leakage is effectively prevented, and the service life of the spray gun is prolonged. And the operation safety and stability of the system are ensured. According to the device, the spray gun can be replaced without shutdown, the production efficiency is improved, gas leakage is effectively prevented through the synergistic effect of the hand hole pipe and the isolating valve of the gas sealing device, safety is ensured, all parts are connected compactly, operation is easy and convenient, and the difficulty and cost of replacing the spray gun are reduced.

Description

Technical Field

[0001] This application relates to the field of blast furnace gas spray cooling systems, and in particular to an online spray gun replacement device for blast furnace gas spray cooling systems. Background Technology

[0002] The temperature of blast furnace gas before desulfurization must be below 90℃. Generally, the temperature of gas before entering the gas chamber is 130℃ (maximum 220℃). Therefore, a spray cooling system must be installed on the gas pipeline. The key equipment of the spray cooling system is the spray gun installed on the gas pipeline. The basic function of the spray cooling system is to automatically adjust the spray volume of the spray gun according to the change of gas temperature to ensure that the outlet temperature of the gas pipeline is maintained within the set temperature range.

[0003] During operation, cooling water is filtered from the water source tank and then pressurized by a variable frequency water pump to a certain pressure and flow rate. It is then sent to the spray gun through the outlet pipeline. Under the action of compressed nitrogen, it is atomized to produce very fine atomized particles. The water mist evaporates rapidly in the high-temperature coal gas, absorbing a large amount of heat from the coal gas, which rapidly reduces the temperature of the coal gas and maintains it within a certain temperature range. Therefore, the atomizing spray gun is a key piece of equipment in this system.

[0004] However, the pressure inside general gas pipelines is currently high. Poor sealing at the spray gun installation point or during spray gun maintenance can create a safety hazard of gas leakage. Therefore, to ensure the normal operation of the spray cooling system, an online spray gun replacement device is needed to prevent gas leakage during spray gun maintenance and replacement. Utility Model Content

[0005] This application addresses the safety hazard of gas leakage caused by high pressure in existing gas pipelines, such as poor sealing at the spray gun installation point or during spray gun maintenance. It provides an online spray gun replacement device for a blast furnace gas spray cooling system, characterized by comprising: a spray gun body;

[0006] The spray gun body is connected to the spray gun barrel, and a spray gun atomizing nozzle is provided at the end of the spray gun barrel away from the spray gun body;

[0007] A spray gun mounting assembly is provided between the spray gun body and the spray gun barrel. An isolation valve is provided on one side of the spray gun mounting assembly. One end of the spray gun mounting assembly is fixedly connected to the spray gun barrel, and the other end is provided with a manhole pipe for an air seal device. The manhole pipe for the air seal device is connected to one end of the spray gun body.

[0008] In one feasible implementation, the handhole pipe of the gas sealing device is also connected to a gas sealing compressed nitrogen pipeline.

[0009] The gas-sealed compressed nitrogen pipeline is connected to one end of the spray gun body through the manhole of the gas-sealing device, and a manual valve for the gas-sealed compressed nitrogen pipeline is provided on the gas-sealed compressed nitrogen pipeline.

[0010] In one feasible implementation, the other end of the spray gun body is also connected to an atomizing compressed nitrogen pipeline and a cooling water pipeline. The atomizing compressed nitrogen pipeline is equipped with a manual valve for the atomizing compressed nitrogen pipeline, and the cooling water pipeline is equipped with a manual valve for the cooling water pipeline.

[0011] In one feasible implementation, the spray gun mounting assembly includes a spray gun mounting sleeve, a first spray gun mounting flange, and a second spray gun mounting flange. One end of the spray gun mounting sleeve is connected and fixed to the spray gun barrel, and the other end is fixed to the manhole pipe of the air seal device through the second spray gun mounting flange.

[0012] The first spray gun mounting flange is sleeved on the spray gun mounting sleeve, and the isolation valve is located between the first spray gun mounting flange and the second spray gun mounting flange.

[0013] In one feasible implementation, the air-sealing device handhole tube is further provided with an air-sealing device air hole ring tube.

[0014] In one feasible implementation, a spray gun sealing assembly is provided between the manhole tube of the air sealing device and one end of the spray gun body;

[0015] The spray gun sealing assembly includes: a spray gun sealing plate, two spray gun mating flanges, and spray gun sealing plate fasteners;

[0016] The two spray gun docking flanges are respectively fixed to the end faces of the manhole pipe of the air sealing device and the spray gun body. The spray gun sealing plate is disposed between the two spray gun docking flanges, and the two spray gun docking flanges and the spray gun sealing plate are fixed by the spray gun sealing plate fasteners.

[0017] One feasible implementation also includes: a pressure sensor;

[0018] The pressure sensor is installed on the gas-sealed compressed nitrogen pipeline, and the pressure sensor is used to monitor whether the nitrogen pressure is maintained within a preset range.

[0019] One feasible implementation also includes: a gas leak detector;

[0020] The gas leak detector is installed between the manhole pipe of the gas sealing device and the spray gun mounting assembly. The gas leak detector is used to monitor the leakage of blast furnace gas in real time.

[0021] One feasible implementation also includes: an alarm;

[0022] The alarm is electrically connected to the gas leak detector and the pressure sensor. The alarm is used to issue an alarm signal when the gas leak detector detects a gas leak or the pressure sensor detects that the nitrogen pressure is not within a preset range.

[0023] This application provides an online spray gun replacement device for a blast furnace gas spray cooling system, comprising a spray gun body, a spray gun barrel, a spray gun mounting assembly, an isolation valve, and a manhole pipe for a gas sealing device. This device allows for spray gun replacement without shutting down the system, improving production efficiency. Through the synergistic action of the manhole pipe for the gas sealing device and the isolation valve, gas leakage is effectively prevented, ensuring safety. Furthermore, the compact connections of the components and ease of operation reduce the difficulty and cost of spray gun replacement. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 This is a schematic diagram of an online spray gun replacement device for a blast furnace gas spray cooling system, as shown in an exemplary embodiment of this application.

[0026] Figure 2 This is a cross-sectional schematic diagram of the handhole tube of the air-sealing device shown in an exemplary embodiment of this application.

[0027] Attached image annotations:

[0028] 10-Spray gun body; 20-Spray gun barrel; 30-Spray gun mounting assembly; 40-Spray gun atomizing nozzle; 50-Isolation valve; 60-Air seal device manhole pipe; 70-Spray gun sealing assembly; 11-Air seal compressed nitrogen circuit manual valve; 12-Atomizing compressed nitrogen circuit manual valve; 13-Cooling water circuit manual valve; 31-Spray gun mounting sleeve; 32-First spray gun mounting flange; 33-Second spray gun mounting flange; 61-Air seal device vent ring pipe; 71-Spray gun sealing plate; 72-Spray gun docking flange. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of the implementation of embodiments of the present invention.

[0030] Blast furnace gas needs to be cooled to below 90℃ before desulfurization, but the temperature of the gas before entering the gas chamber can reach 130℃ (up to 220℃). Therefore, a spray cooling system needs to be installed on the gas pipeline. The core equipment of this system is the spray gun, which automatically adjusts the water spray volume according to the gas temperature change to maintain the gas pipeline outlet temperature within a set range. During operation, cooling water is filtered, pressurized by a variable frequency pump, and regulated to a certain pressure and flow rate before being sent to the spray gun. Under the action of compressed nitrogen, it is atomized into fine particles, which quickly evaporate and absorb the heat of the gas, achieving cooling. However, the pressure inside the gas pipeline is high, and poor sealing at the spray gun installation point or maintenance can easily lead to gas leakage. Therefore, an online spray gun replacement device needs to be designed to ensure the safe and efficient operation of the spray cooling system and avoid the risk of gas leakage.

[0031] To solve the above problems, refer to Figure 1 As shown, this application provides an online spray gun replacement device for a blast furnace gas spray cooling system, comprising: a spray gun body 10; the spray gun body 10 is connected to a spray gun tube 20, and a spray gun atomizing nozzle 40 is provided at the end of the spray gun tube 20 away from the spray gun body 10; a spray gun mounting assembly 30 is provided between the spray gun body 10 and the spray gun tube 20, and a shut-off valve 50 is provided on one side of the spray gun mounting assembly 30; one end of the spray gun mounting assembly 30 is fixedly connected to the spray gun tube 20, and the other end is provided with a gas sealing device manhole pipe 60, which is connected to one end of the spray gun body 10.

[0032] The spray gun body 10 receives cooling water from the cooling water pipeline and mixes it with compressed nitrogen through an internal mechanism to form atomized particles. The spray gun tube 20 is connected to the spray gun body 10 and guides the atomized cooling water particles into the gas pipeline to achieve a cooling effect. The spray gun mounting assembly 30 is located between the spray gun body 10 and the spray gun tube 20, serving as a connection and fixation component. The design of the spray gun mounting assembly 30 allows for quick replacement of the spray gun without interrupting the gas flow, improving system maintenance efficiency and safety.

[0033] An isolation valve 50 is located on one side of the spray gun mounting assembly 30. The isolation valve 50 cuts off the gas flow when the spray gun is replaced, effectively preventing gas leakage. A gas sealing device manhole pipe 60 is connected to the other end of the spray gun mounting assembly 30 and communicates with one end of the spray gun body 10. The design of the gas sealing device manhole pipe 60 allows for manual replacement or maintenance of the body 10 without disassembling the entire system. Simultaneously, the gas sealing device manhole pipe 60 ensures gas tightness during replacement, further reducing the risk of gas leakage.

[0034] The device described in this application achieves gas sealing during online spray gun replacement through the isolation valve 50 and the gas sealing device manhole pipe 60, effectively preventing gas leakage and ensuring the safety and stability of system operation. Simultaneously, the design of the spray gun mounting assembly 30 allows for spray gun replacement without interrupting gas flow, significantly reducing system downtime and improving maintenance efficiency.

[0035] In some embodiments of this application, a compressed nitrogen gas pipeline is also connected to one side of the manhole pipe 60 of the gas sealing device; the compressed nitrogen gas pipeline is connected to one end of the spray gun body 10 through the manhole pipe 60 of the gas sealing device, and a manual valve 11 for the compressed nitrogen gas pipeline is provided on the compressed nitrogen gas pipeline.

[0036] The manhole pipe 60 of the gas sealing device is connected to the gas-sealed compressed nitrogen pipeline, allowing nitrogen to directly enter the sealing area of ​​the spray gun body 10 through the manhole pipe 60, forming an additional nitrogen barrier to effectively isolate coal gas. The gas-sealed compressed nitrogen pipeline is responsible for delivering compressed nitrogen to the manhole pipe 60 of the gas sealing device, and then into the sealing area of ​​the spray gun body 10.

[0037] The manual valve 11 for the gas-sealed compressed nitrogen circuit is installed on the gas-sealed compressed nitrogen circuit pipeline. Its opening and closing can precisely control the nitrogen supply. When the spray gun is replaced or repaired, the nitrogen supply can be cut off by closing the manual valve 11 for easy maintenance. During normal operation, the manual valve 11 is opened to ensure the formation of a nitrogen barrier.

[0038] By introducing the manual valve 11 for the gas-sealed compressed nitrogen line, this embodiment forms an additional nitrogen barrier at the installation location of the spray gun body 10, effectively solving the problem of gas leakage caused by poor sealing. This design not only improves the sealing performance of the system but also enhances its safety and reliability. When replacing or overhauling the spray gun, the nitrogen supply can be easily cut off by closing the manual valve 11 for the gas-sealed compressed nitrogen line, reducing the difficulty and complexity of operation. At the same time, the presence of the nitrogen barrier also reduces the risk of gas leakage during maintenance, ensuring the safety of maintenance personnel.

[0039] In some embodiments of this application, the other end of the spray gun body 10 is also connected to an atomizing compressed nitrogen pipeline and a cooling water pipeline. The atomizing compressed nitrogen pipeline is provided with an atomizing compressed nitrogen manual valve 12, and the cooling water pipeline is provided with a cooling water manual valve 13.

[0040] Specifically, the atomizing compressed nitrogen pipeline is connected to the spray gun body 10, responsible for delivering compressed nitrogen to the inside of the spray gun for atomizing cooling water particles. The compressibility and stability of nitrogen ensure the uniformity and efficiency of the atomization effect. A manual valve 12 for the atomizing compressed nitrogen pipeline is installed to precisely control the nitrogen supply, ensuring a stable and continuous supply of nitrogen during spray gun operation, while also allowing for rapid shut-off of the nitrogen supply during maintenance or replacement of the spray gun, ensuring operational safety.

[0041] The cooling water pipe is also connected to the spray gun body 10, responsible for delivering cooling water to the inside of the spray gun, where it mixes with nitrogen to form atomized particles. A manual cooling water valve 13 is installed on the cooling water pipe to regulate the flow and pressure of the cooling water to meet cooling requirements under different operating conditions. When repairing or replacing the spray gun, closing the manual cooling water valve 13 prevents cooling water leakage and keeps the system dry and clean.

[0042] The sealing performance of the spray gun body 10 is improved by using the manual valve 12 for the atomizing compressed nitrogen circuit and the manual valve 13 for the cooling water circuit. During operation, nitrogen and cooling water enter the spray gun through their respective pipes, forming atomized particles and being sprayed out, effectively cooling the coal gas. When repairing or replacing the spray gun, closing the manual valve 12 for the atomizing compressed nitrogen circuit and the manual valve 13 for the cooling water circuit cuts off the supply of nitrogen and cooling water, preventing leakage.

[0043] In some embodiments of this application, the spray gun mounting assembly 30 includes a spray gun mounting sleeve 31, a first spray gun mounting flange 32, and a second spray gun mounting flange 33. One end of the spray gun mounting sleeve 31 is connected and fixed to the spray gun barrel 20, and the other end is fixed to the manhole pipe 60 of the air seal device through the second spray gun mounting flange 33. The first spray gun mounting flange 32 is sleeved on the spray gun mounting sleeve 31, and the isolation valve 50 is located between the first spray gun mounting flange 32 and the second spray gun mounting flange 33.

[0044] One end of the spray gun mounting sleeve 31 is tightly connected to and fixed to the spray gun barrel 20, ensuring the stability and accuracy of the spray gun during operation. The other end is fixedly connected to the manhole pipe 60 of the air sealing device through the second spray gun mounting flange 33, forming a bridge between the spray gun and the air sealing system, ensuring the effective delivery and sealing effect of nitrogen.

[0045] The first spray gun mounting flange 32, fitted onto the spray gun mounting sleeve 31 and located upstream of the second spray gun mounting flange 33, primarily serves as a mounting platform for the isolation valve 50. The isolation valve 50 is positioned between the first and second spray gun mounting flanges 32 and 33. Its main function is to quickly disconnect the spray gun from the gas pipeline during spray gun replacement or maintenance, thereby preventing the risk of gas leakage. Furthermore, the isolation valve 50 is easy to open and close, greatly improving the convenience and efficiency of maintenance. The isolation valve 50 positioned between the first and second spray gun mounting flanges 32 and 33 together form a sealing barrier for the system, effectively preventing the leakage of gas and nitrogen, and ensuring the safety and reliability of the system.

[0046] In some embodiments of this application, reference is made to Figure 2 As shown, the manhole pipe 60 of the gas sealing device also includes a gas sealing device vent ring pipe 61. The manhole pipe 60 is mainly used to provide a passage for personnel or tools to enter the equipment for installation, maintenance, or inspection. It is generally made of high-strength materials to ensure its ability to withstand internal pressure and external environment. The vent ring pipe 61 is an annular pipe arranged around the inside of the manhole pipe 60, used to introduce or discharge gas to maintain stable gas pressure inside the storage tank or equipment.

[0047] The main function of the gas sealing device's vent ring pipe 61 is to regulate the internal gas pressure of the equipment. When the internal gas pressure is too high or too low, gas can be introduced or discharged through the vent ring pipe 61 to maintain the pressure within the set range. By precisely controlling the internal gas pressure, the vent ring pipe 61 helps improve the stability and operating efficiency of the equipment. In use, when compressed nitrogen enters the vent ring pipe 61 after the compressed nitrogen gas path manual valve 11 is opened, it can be accelerated out through the ring holes to form a gas seal and block the coal gas.

[0048] In some embodiments of this application, a spray gun sealing assembly 70 is provided between the manhole tube 60 of the air sealing device and one end of the spray gun body 10; the spray gun sealing assembly 70 includes: a spray gun sealing plate 71, two spray gun docking flanges 72 and a spray gun sealing plate fastener 73; the two spray gun docking flanges 72 are respectively fixed on the end faces of the manhole tube 60 of the air sealing device and the spray gun body 10, the spray gun sealing plate 71 is disposed between the two spray gun docking flanges 72, and the two spray gun docking flanges 72 and the spray gun sealing plate 71 are fixed by the spray gun sealing plate fastener 73.

[0049] The spray gun sealing plate 71 can be made of high-strength, corrosion-resistant materials, such as stainless steel or alloy steel. The function of the spray gun sealing plate 71 is to provide a flat, smooth sealing surface that fits tightly against the two spray gun mating flanges 72, thereby effectively preventing gas or liquid leakage.

[0050] Two spray gun mating flanges 72 are respectively fixed to the outlet end of the manhole pipe 60 of the air-sealing device and the mating end face of the spray gun body 10, ensuring the reliability and stability of the connection. The spray gun mating flanges 72 are provided with bolt holes for installing the spray gun sealing plate fasteners 73. The spray gun sealing plate fasteners 73 are generally bolts, nuts, and washers, used to firmly connect the spray gun sealing plate 71 and the two spray gun mating flanges 72 together. With appropriate pre-tightening force, a tight fit between the sealing surfaces can be ensured, thereby achieving the desired sealing effect.

[0051] In the specific connection process, firstly, the spray gun mating flange 72 is fixed to the mating end faces of the air sealing device manhole pipe 60 and the spray gun body 10 respectively. Then, the spray gun sealing plate 71 is placed between the two flanges, and they are firmly connected together by the spray gun sealing plate fastener 73. In this way, a complete and reliable sealing structure is formed.

[0052] The main function of the spray gun sealing assembly 70 is to ensure a tight connection between the manhole tube 60 of the gas sealing device and the spray gun body 10, preventing gas or liquid leakage. Simultaneously, during spray gun operation, changes in gas pressure and temperature may generate vibrations and impacts. The design of the spray gun sealing assembly 70 can absorb these vibrations and impacts to a certain extent, protecting other components of the system from damage.

[0053] In some embodiments of this application, a pressure sensor is also included; the pressure sensor is disposed on the gas-sealed compressed nitrogen pipeline, and the pressure sensor is used to monitor whether the nitrogen pressure is maintained within a preset range.

[0054] Gas leak detector; The gas leak detector is installed between the manhole pipe 60 of the gas sealing device and the spray gun mounting assembly 30. The gas leak detector is used to monitor the leakage of blast furnace gas in real time.

[0055] Alarm; The alarm is electrically connected to the gas leak detector and the pressure sensor. The alarm is used to issue an alarm signal when the gas leak detector detects a gas leak or the pressure sensor detects that the nitrogen pressure is not within the preset range.

[0056] The installation of pressure sensors helps prevent seal failure due to insufficient nitrogen pressure and avoids potential safety accidents caused by excessive nitrogen pressure. Once a gas leak detector detects a gas leak, it immediately activates an alarm mechanism to alert operators and prevent further escalation. The combination of pressure sensors and gas leak detectors allows the system to monitor nitrogen pressure and gas leaks in real time, ensuring the system remains in a safe and stable operating condition.

[0057] In the event of any abnormality in the unit, such as insufficient nitrogen pressure or gas leakage, the alarm will activate immediately, providing timely warning information to operators so they can take swift action to prevent accidents. By introducing these key components, the overall safety of the unit has been significantly improved. Both nitrogen pressure monitoring and gas leak detection provide strong guarantees for the safe operation of the unit.

[0058] When replacing the spray gun online, compressed nitrogen enters the gas sealing device's gas hole ring pipe through the opened manual valve of the compressed nitrogen gas line. It is then accelerated and blown out through the ring hole, forming a gas seal to block the blast furnace gas. The manual valves of the atomizing compressed nitrogen gas line and the cooling water gas line are then closed. Next, the fasteners of the spray gun sealing plate are loosened, and the spray gun body is pulled outwards to the manhole pipe of the gas sealing device. The isolation valve is then closed, and finally, the spray gun tube connecting flange bolts are unloaded, the spray gun is pulled out, and the manual valve of the compressed nitrogen gas line is closed again. This achieves online replacement of the spray gun while ensuring no risk of blast furnace gas leakage.

[0059] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the disclosure in the specification and the embodiments. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

Claims

1. A device for online replacement of a lance for a blast furnace gas spray cooling system, characterized in that Include: The spray gun body (10); The spray gun body (10) is communicated with the spray gun barrel (20), and the spray gun barrel (20) is provided with a spray gun atomizing nozzle (40) at one end away from the spray gun body (10); The spray gun body (10) and the spray gun barrel (20) are provided with a spray gun mounting assembly (30), one side of the spray gun mounting assembly (30) is provided with a cut-off valve (50), one end of the spray gun mounting assembly (30) is fixedly connected with the spray gun barrel (20), and the other end is provided with a gas seal device hand hole pipe (60), the gas seal device hand hole pipe (60) is communicated with one end of the spray gun body (10).

2. The device for online replacement of the lance for the blast furnace gas spray cooling system according to claim 1, characterized in that, One side of the gas seal device hand hole pipe (60) is also communicated with a gas seal compressed nitrogen gas path pipeline; The gas seal compressed nitrogen gas path pipeline is communicated with one end of the spray gun body (10) through the gas seal device hand hole pipe (60), and the gas seal compressed nitrogen gas path pipeline is provided with a gas seal compressed nitrogen gas path manual valve (11).

3. The device for online replacement of the lance for the blast furnace gas spray cooling system according to claim 1, characterized by the fact that, The other end of the spray gun body (10) is also communicated with an atomizing compressed nitrogen gas path pipeline and a cooling water path pipeline, the atomizing compressed nitrogen gas path pipeline is provided with an atomizing compressed nitrogen gas path manual valve (12), and the cooling water path pipeline is provided with a cooling water path manual valve (13).

4. The device for online replacement of the lance for the blast furnace gas spray cooling system according to claim 1, characterized by the fact that, The spray gun mounting assembly (30) includes a spray gun mounting sleeve (31), a first spray gun mounting flange (32) and a second spray gun mounting flange (33), one end of the spray gun mounting sleeve (31) is communicated and fixed with the spray gun barrel (20), and the other end is fixed with the gas seal device hand hole pipe (60) through the second spray gun mounting flange (33); The first spray gun mounting flange (32) is sleeved on the spray gun mounting sleeve (31), and the cut-off valve (50) is arranged between the first spray gun mounting flange (32) and the second spray gun mounting flange (33).

5. The device for online replacement of the lance for the blast furnace gas spray cooling system according to claim 1, characterized by the fact that, The gas seal device hand hole pipe (60) is also provided with a gas seal device gas hole ring pipe (61).

6. The device for online replacement of the lance for the blast furnace gas spray cooling system according to claim 1, characterized by the fact that, The gas seal device hand hole pipe (60) and one end of the spray gun body (10) are provided with a spray gun sealing assembly (70); The spray gun sealing assembly (70) comprises a spray gun sealing plate (71), two spray gun butt flanges (72) and a spray gun sealing plate fastener (73); Two spray gun butt flanges (72) are respectively fixed on the end faces of the gas seal device hand hole pipe (60) and the spray gun body (10), the spray gun sealing plate (71) is arranged between the two spray gun butt flanges (72), and the two spray gun butt flanges (72) and the spray gun sealing plate (71) are fixed by the spray gun sealing plate fastener (73).

7. The device as claimed in claim 2, wherein, Also include: Pressure sensor; The pressure sensor is arranged on the gas seal compressed nitrogen gas path pipeline, and the pressure sensor is used for monitoring whether the nitrogen pressure is kept in a preset range.

8. The device for online replacement of the lance for the blast furnace gas spray cooling system according to claim 7, characterized by the fact that, Also include: Coal gas leakage detector; The coal gas leakage detector is arranged between the gas seal device hand hole pipe (60) and the spray gun mounting assembly (30), and the coal gas leakage detector is used for monitoring the leakage of blast furnace gas in real time.

9. The device as claimed in claim 8, wherein, Also include: Alarm; The alarm is electrically connected with the gas leakage detector and the pressure sensor, and is used for sending an alarm signal when the gas leakage detector detects gas leakage or the pressure sensor detects that the nitrogen pressure is not within a preset range.

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