Online treatment method for damaged blast furnace cooling wall and nitrogen stamping protection system

Abstract

The invention discloses an online treatment method for a damaged cooling wall of a blast furnace and a nitrogen stamping protection system. The method comprises the following steps: determining a damaged cooling wall vertical pipe on line, and carrying out jumper connection on the cooling wall vertical pipe adjacent to the damaged cooling wall; the damaged cooling wall vertical pipe is in butt joint with an external nitrogen source; acquiring a pressure value in the blast furnace as a hedging cardinal number; and an external nitrogen source is controlled to inject nitrogen into the damaged cooling wall vertical pipe with the air pressure amount higher than the hedging base number, the nitrogen enters the damaged cooling wall vertical pipe and then enters the blast furnace from the damaged position, and the pressure of the nitrogen released at the damaged position is larger than the pressure in the blast furnace. The damaged vertical pipe of the cooling wall is in butt joint with an external nitrogen gas source, and the nitrogen gas pressure is controlled to be greater than the pressure in the blast furnace, so that nitrogen forms a protective gas curtain at the damaged part, substances such as coal gas in the blast furnace are effectively prevented from leaking from the damaged part, the potential safety hazard is reduced, and the cooling wall is also prevented from being further eroded; and the deterioration speed of the damaged cooling wall vertical pipe is slowed down.

Description

Technical Field

[0001] The present invention belongs to the technical field of ironmaking equipment maintenance, and particularly relates to an on-line treatment method for damaged blast furnace cooling stave and a nitrogen gas pressing protection system. Background Art

[0002] The blast furnace cooling system is a core link in ironmaking production, and its stability directly affects the service life and production efficiency of the blast furnace. In high-temperature and high-abrasion areas such as the belly, waist and lower part of the furnace body, cylindrical cooling staves are installed. However, although copper cooling staves (Cu>99.5%) gradually replace cast iron materials due to their high thermal conductivity and fast slag skin reconstruction ability (within 15 minutes), they still face severe challenges under the harsh working conditions of the blast furnace: Frequent damage problems: Copper cooling staves are installed in high-temperature and high-scouring areas inside the blast furnace. They are long-term affected by the impact of furnace charge, erosion of coal gas flow and thermal stress. The welds of the water supply and return copper pipes are easily cracked due to internal flash stress (cold surface damage) or leakage caused by wear on the hot surface. Once damaged, the cooling water seeping into the furnace will cause fluctuations in the furnace conditions, and even forced shutdown for maintenance, resulting in huge economic losses.

[0003] In addition, once the cooling stave is damaged, most traditional repair technologies require furnace shutdown for treatment, such as grouting plugging or replacing the cooling stave. This not only takes time (for example, a 4-hour shutdown of the blast furnace results in an iron loss of 1200 tons per time), but also cannot avoid the risk of secondary damage.

[0004] If the jump connection method is used to skip the damaged part and let the damaged cooling stave be out of service for a long time, the local area will be prone to accelerated wear due to the lack of cooling medium, and even collapse, further threatening the safety of the blast furnace. Although there have been attempts to introduce industrial water for temporary cooling, the water leakage still affects the pressure balance inside the furnace and it is difficult to completely solve the problem. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art, and provides an on-line treatment method for damaged blast furnace cooling stave and a nitrogen gas pressing protection system, which realizes the on-line treatment of damaged cooling wall pipes of the blast furnace, eliminates the need for mid-course shutdown maintenance, reduces the losses caused by production suspension due to damaged cooling pipes, and extends the service life of the cooling stave.

[0006] Based on the description, on one hand, the present invention provides an on-line treatment method for damaged blast furnace cooling stave, including: On-line determining the damaged cooling wall riser pipe, and making a jump connection to the cooling wall riser pipes adjacent to the damaged one; Connecting the damaged cooling wall riser pipe to an external nitrogen gas source; Obtaining the blast furnace internal pressure value as the counterpressure base number; Control the external nitrogen gas source to inject nitrogen into the damaged cooling stave riser at a gas pressure higher than the hedging base amount. After the nitrogen enters the damaged cooling stave riser, it enters the blast furnace interior from the damaged part, making the nitrogen pressure released at the damaged part greater than the blast furnace interior pressure.

[0007] In the above technical solution, by online determining the damaged cooling stave riser and solving it online, there is no need for shutdown maintenance, effectively avoiding the impact of blast furnace shutdown on production, ensuring the continuous and stable operation of the blast furnace, reducing the economic losses caused by production suspension, connecting the damaged cooling stave riser to the external nitrogen gas source, and controlling the nitrogen pressure to be greater than the blast furnace interior pressure, so that nitrogen forms a protective air curtain at the damaged part, effectively preventing substances such as gas in the blast furnace from leaking from the damaged part, reducing potential safety hazards, and at the same time avoiding further erosion of the cooling stave. Through the protection of nitrogen, the deterioration rate of the damaged cooling stave riser is slowed down, winning time for subsequent repair or replacement work, and helping to extend the overall service life of the cooling stave.

[0008] As a further technical measure, when injecting nitrogen into the damaged cooling stave riser, monitor the change of the blast furnace interior pressure and the nitrogen pressure at the damaged part of the cooling stave riser in real time, and dynamically adjust the nitrogen release pressure of the external nitrogen gas source according to the change of the blast furnace interior pressure to ensure that the nitrogen pressure at the damaged part of the cooling stave riser is always higher than the blast furnace interior pressure.

[0009] In the above technical solution, monitor the change of the blast furnace interior pressure and the nitrogen pressure at the damaged part of the cooling stave riser in real time, and dynamically adjust the nitrogen release amount of the external nitrogen gas source according to the change of the blast furnace interior pressure, so that the system can adapt to the fluctuation of the blast furnace interior pressure in real time, ensure that the nitrogen pressure at the damaged part of the cooling stave riser is always within a safe and effective range; ensure that the nitrogen pressure at the damaged part of the cooling stave riser is always higher than the blast furnace interior pressure, further enhancing the protection effect on the damaged part and improving the safety and stability of the production process.

[0010] As a further technical measure, monitoring the nitrogen pressure at the damaged part of the cooling stave riser includes: Install a gas pressure sensor inside the damaged cooling stave riser; Connect the gas pressure sensor to the controller through a wireless signal; The controller obtains the gas pressure data transmitted by the gas pressure sensor in real time, which is the internal gas pressure of the pipeline. Subtracting the internal gas pressure of the pipeline from the gas source release pressure can obtain the nitrogen pressure at the damaged part of the cooling stave riser.

[0011] In the above technical solution, a gas pressure sensor is installed inside the riser of the cooling stave and connected to the controller through a wireless signal, realizing real-time monitoring of the pressure at the damaged part, obtaining accurate pressure data in a timely manner, providing a reliable basis for subsequent regulation operations; providing data support for the automatic control system, enabling the regulation of nitrogen pressure to respond more timely and accurately to the changes in the internal pressure of the blast furnace, and improving the intelligent level and operation efficiency of the entire system.

[0012] As a further technical measure, the value of the nitrogen pressure at the damaged part of the cooling stave riser is always higher than the internal pressure of the blast furnace, and the range is between 0.5 and 1.2 MPa.

[0013] As a further technical measure, the determination of the damaged position of the cooling stave riser includes: By closing the return water valves and corresponding water supply valves of each layer of the cooling riser one by one to form a pressure-holding state, and judging whether there is damage to the cooling riser and the specific damaged layer according to the change of the pressure gauge value; If the decrease amplitude of the pressure gauge value exceeds the threshold, there is a damaged and leaking state in the cooling riser; If there is no external leakage phenomenon and the change amplitude of the pressure gauge value exceeds the threshold, it is judged as internal leakage.

[0014] In the above technical solution, by closing the return water valves and corresponding water supply valves of each layer of the cooling riser one by one to form a pressure-holding state, and judging whether there is damage to the cooling riser and the specific damaged layer according to the change of the pressure gauge value, the damaged position can be determined quickly and accurately, improving the maintenance efficiency; it can not only detect obvious external leakage situations, but also judge internal leakage problems through the change amplitude of the pressure gauge value exceeding the threshold, ensuring a comprehensive detection of the damage situation of the cooling stave riser and avoiding missed detection and misjudgment.

[0015] As a further technical measure, the jump connection of the cooling stave riser adjacent to the damaged one includes: Disconnect the valves at both ends of the damaged cooling stave riser; Open holes and weld jump connection pipe heads on the two cooling stave risers adjacent to the upper and lower of the damaged cooling stave riser, install quick connectors, and then connect the two quick connectors through pipes, avoiding the damaged cooling stave riser.

[0016] As a further technical measure, connecting the damaged cooling stave riser to an external nitrogen gas source includes: Connect one end of the damaged cooling stave riser to the output end of the external nitrogen gas source; Connect the other end of the damaged cooling stave riser to the nitrogen storage equipment of the external nitrogen gas source to form a closed loop for the nitrogen gas flow.

[0017] In the above technical solution, one end of the damaged riser of the cooling stave is connected to the output end of an external nitrogen gas source, and the other end is connected to a nitrogen gas storage device, so that the flow direction of the nitrogen gas forms a closed loop, improving the utilization efficiency of the nitrogen gas. At the same time, it also helps to stabilize the nitrogen gas pressure and ensure the continuity and reliability of the nitrogen gas supply. By recycling the nitrogen gas into the storage device, the recycling of the nitrogen gas is realized, the consumption of the nitrogen gas is reduced, and the production cost is saved.

[0018] Based on the description, on the one hand, the present invention provides a nitrogen gas stamping protection system for an on-line treatment method after the damage of a blast furnace cooling stave, including: A blast furnace pressure detection module for dynamically monitoring the internal pressure of the high pressure. A pipeline nitrogen gas pressure detection module for dynamically monitoring the nitrogen gas pressure in the pipeline after the nitrogen gas passes through the damaged part of the riser of the cooling stave. A nitrogen gas control module for dynamically controlling the release amount of the external nitrogen gas source according to the internal pressure of the high pressure and the nitrogen gas pressure at the damaged part of the riser of the cooling stave fed back by the blast furnace pressure detection module and the pipeline nitrogen gas pressure detection module, so that the nitrogen gas pressure at the damaged part of the riser of the cooling stave is always greater than the internal pressure of the blast furnace.

[0019] In the above technical solution, the nitrogen gas stamping protection system integrates functional modules such as blast furnace pressure detection, pipeline nitrogen gas pressure detection, and nitrogen gas control, providing a systematic and automated solution for the on-line treatment after the damage of the blast furnace cooling stave, greatly improving the efficiency and reliability of the treatment process. According to the data fed back by the blast furnace pressure detection module and the pipeline nitrogen gas pressure detection module, the nitrogen gas control module can dynamically control the release amount of the external nitrogen gas source in real time to ensure that the nitrogen gas pressure at the damaged part of the riser of the cooling stave is always greater than the internal pressure of the blast furnace, realizing the precise control and automated management of the whole treatment process, and further enhancing the safety and stability of production.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention determines and solves the damaged riser of the cooling stave on-line without the need for shutdown and maintenance, effectively avoiding the impact of blast furnace shutdown on production, ensuring the continuous and stable operation of the blast furnace, reducing the economic losses caused by production stoppage, connecting the damaged riser of the cooling stave to an external nitrogen gas source, and controlling the nitrogen gas pressure to be greater than the internal pressure of the blast furnace, so that the nitrogen gas forms a protective air curtain at the damaged part, effectively preventing substances such as gas in the blast furnace from leaking from the damaged part, reducing potential safety hazards, and at the same time avoiding further erosion of the cooling stave. Through the protection of the nitrogen gas, the deterioration speed of the damaged riser of the cooling stave is slowed down, gaining time for subsequent repair or replacement work, and helping to extend the overall service life of the cooling stave.

[0021] 2. The present invention monitors in real time the change in the internal pressure of the blast furnace and the nitrogen pressure at the damaged part of the riser of the cooling stave, and dynamically adjusts the nitrogen release amount of the external nitrogen gas source according to the change in the internal pressure of the blast furnace, enabling the system to adapt to the fluctuation of the internal pressure of the blast furnace in real time, ensuring that the nitrogen pressure at the damaged part of the riser of the cooling stave is always within a safe and effective range; ensuring that the nitrogen pressure at the damaged part of the riser of the cooling stave is always higher than the internal pressure of the blast furnace, further enhancing the protection effect on the damaged part and improving the safety and stability of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic flow chart of an on-line treatment method for a damaged cooling stave of a blast furnace provided by an embodiment of the present invention; Figure 2 FIG. is a schematic structural diagram of a nitrogen stamping protection system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and 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 operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0025] As Figure 1 shown, on the one hand, the present invention provides an on-line treatment method for a damaged cooling stave of a blast furnace, including: On-line determining the damaged riser of the cooling stave and performing a jump connection on the risers of the cooling staves adjacent to the damaged one; Connecting the damaged riser of the cooling stave to an external nitrogen gas source; Obtaining the numerical value of the internal pressure of the blast furnace as a hedging base number; Controlling the external nitrogen gas source to charge nitrogen into the damaged riser of the cooling stave at a gas pressure higher than the hedging base number, and after the nitrogen enters the damaged riser of the cooling stave, it enters the interior of the blast furnace from the damaged part, so that the nitrogen pressure released at the damaged part is greater than the internal pressure of the blast furnace.

[0026] In the above technical solution, by determining the damaged cooling stave riser online and solving it online, there is no need for shutdown maintenance, effectively avoiding the impact of blast furnace shutdown on production, ensuring the continuous and stable operation of the blast furnace, reducing the economic losses caused by production suspension, connecting the damaged cooling stave riser to an external nitrogen gas source, and controlling the nitrogen pressure to be greater than the pressure inside the blast furnace, so that nitrogen forms a protective air curtain at the damaged part, effectively preventing substances such as gas in the blast furnace from leaking from the damaged part, reducing potential safety hazards, and at the same time avoiding further erosion of the cooling stave. Through the protective effect of nitrogen, the deterioration rate of the damaged cooling stave riser is slowed down, gaining time for subsequent repair or replacement work, and helping to extend the overall service life of the cooling stave.

[0027] In this embodiment, when filling nitrogen into the damaged cooling stave riser, the internal pressure change of the blast furnace and the nitrogen pressure at the damaged part of the cooling stave riser are monitored in real time, and the nitrogen release pressure of the external nitrogen gas source is dynamically regulated according to the internal pressure change of the blast furnace to ensure that the nitrogen pressure at the damaged part of the cooling stave riser is always higher than the internal pressure of the blast furnace.

[0028] In the above technical solution, the internal pressure change of the blast furnace and the nitrogen pressure at the damaged part of the cooling stave riser are monitored in real time, and the nitrogen release amount of the external nitrogen gas source is dynamically regulated according to the internal pressure change of the blast furnace, enabling the system to adapt to the fluctuations of the internal pressure of the blast furnace in real time, ensuring that the nitrogen pressure at the damaged part of the cooling stave riser is always within a safe and effective range; ensuring that the nitrogen pressure at the damaged part of the cooling stave riser is always higher than the internal pressure of the blast furnace further enhances the protection effect on the damaged part and improves the safety and stability of the production process.

[0029] In this embodiment, monitoring the nitrogen pressure at the damaged part of the cooling stave riser includes: Installing a barometric pressure sensor inside the damaged cooling stave riser; Connecting the barometric pressure sensor to the controller through a wireless signal; The controller obtains the barometric pressure data transmitted by the barometric pressure sensor in real time, which is the internal pressure of the pipeline, and the nitrogen pressure at the damaged part of the cooling stave riser can be obtained by subtracting the internal pressure of the pipeline from the gas source release pressure.

[0030] In the above technical solution, a barometric pressure sensor is installed in the cooling stave riser and connected to the controller through a wireless signal, realizing real-time monitoring of the pressure at the damaged part, obtaining accurate pressure data in a timely manner, providing a reliable basis for subsequent regulation operations; providing data support for the automated control system, enabling the regulation of nitrogen pressure to respond more timely and accurately to the change of the internal pressure of the blast furnace, and improving the intelligent level and operation efficiency of the entire system.

[0031] In this embodiment, the value by which the nitrogen pressure at the damaged part of the cooling stave riser is always higher than the internal pressure of the blast furnace ranges from 0.5 to 1.2 MPa.

[0032] In this embodiment, determining the damaged position of the riser of the cooling stave includes: By closing the return water valves and corresponding water supply valves of each layer of the cooling riser one by one to form a pressure-holding state, and judging whether there is damage and the specific damaged layer of the cooling riser according to the change of the pressure gauge value; If the decrease amplitude of the pressure gauge value exceeds the threshold, there is a damaged and leaking state in the cooling riser; If there is no external leakage phenomenon and the change amplitude of the pressure gauge value exceeds the threshold, it is judged as internal leakage.

[0033] In the above technical solution, by closing the return water valves and corresponding water supply valves of each layer of the cooling riser one by one to form a pressure-holding state, and judging whether there is damage and the specific damaged layer of the cooling riser according to the change of the pressure gauge value, the damaged position can be determined quickly and accurately, improving the maintenance efficiency; it can not only detect obvious external leakage conditions, but also judge internal leakage problems through the change amplitude of the pressure gauge value exceeding the threshold, ensuring a comprehensive detection of the damaged situation of the riser of the cooling stave and avoiding missed detection and misjudgment. In this embodiment, making a jump connection to the cooling risers adjacent to the damaged cooling stave includes: Disconnect the valves at both ends of the damaged cooling riser; Open holes and weld jump connection pipe heads on the two cooling risers adjacent to the damaged cooling riser above and below, install quick connectors, and then connect the two quick connectors through pipes to avoid the damaged cooling riser.

[0034] In this embodiment, connecting the damaged cooling riser to an external nitrogen gas source includes: Connect one end of the damaged cooling riser to the output end of the external nitrogen gas source; Connect the other end of the damaged cooling riser to the nitrogen storage equipment of the external nitrogen gas source to form a closed loop for the nitrogen gas flow direction.

[0035] It should be noted here that the air pressure sensor is installed at the connection between the other end of the damaged cooling riser and the nitrogen storage equipment. Installing it here can detect the remaining air pressure in the pipeline after part of the nitrogen gas seeps out from the crack after the nitrogen gas passes through the pipeline.

[0036] In the above technical solution, connecting one end of the damaged cooling riser to the output end of the external nitrogen gas source and the other end to the nitrogen storage equipment to form a closed loop for the nitrogen gas flow direction improves the utilization efficiency of nitrogen gas, and also helps to stabilize the nitrogen gas pressure, ensuring the continuity and reliability of nitrogen gas supply; by recycling the nitrogen gas into the storage equipment, the recycling of nitrogen gas is realized, reducing the consumption of nitrogen gas and saving the production cost.

[0037] As an implementation manner of the present invention: Under the normal and stable operation of the blast furnace, the equipment section, production technology section, environmental protection and safety section of the ironworks, and the leaders of the blast furnace workshop formulated a safety leak detection and positioning plan. They organized 10 piping personnel. In the first step, they carried out a pressure holding test online to determine which section was damaged. They were divided into three groups: the first group of three people in section 14 wore gas alarms, air respirators, mobile phone headsets; the second group of three people wore gas alarms, air respirators, safety ropes, and mobile phone headsets. They were on the second platform of section 7 of the furnace body. The third group of people wore gas alarms and mobile phone headsets on the water supply platform of section 1 of the furnace base. The three groups of personnel took their positions. One person from the second group climbed down beside the water supply valve of section 7. One person on the upper platform pulled the safety rope and contacted the person below with a mobile phone headset to close the valve. One person contacted the person above with a mobile phone headset to close the valve. The person in the middle closed the valve of section 7. The person above reported that the pressure holding pressure gauge rose, and the person below reported that the pressure holding pressure gauge dropped. The three groups of personnel opened the valve to restore the normal soft water, proving that the section below section 6 was damaged. Because the gas alarm reached the top in the high-gas area, the crew temporarily retreated safely to the inclined bridge opening to get some fresh air and clear their heads.

[0038] After waking up, the crew took action again. The three groups of personnel took their positions. One person from the second group climbed down beside the water supply valve of section 6. One person on the upper platform pulled the safety rope and contacted the person below with a mobile phone headset to close the valve. One person contacted the person above with a mobile phone headset to close the valve. The person in the middle closed the water supply valve of section 6. The person above reported that the pressure holding pressure gauge rose, and the person below reported that the pressure holding pressure gauge dropped. The three groups of personnel opened the valve to restore the normal soft water. (They also pried open the Φ25 valve on the return pipe of section B29#5 with a crowbar and opened the Φ25 valve on the return water of section 5. When the soft water was clear, it proved that the valve was cleared and closed), proving that the section below section 5 was damaged. Because the gas alarm reached the top in the high-gas area, the crew temporarily retreated safely to the inclined bridge opening to get some fresh air and clear their heads.

[0039] After waking up, the crew took action again. The three groups of personnel took their positions. One person from the second group climbed down beside the water supply valve of section 5. One person on the upper platform pulled the safety rope and contacted the person below with a mobile phone headset to close the valve. One person contacted the person above with a mobile phone headset to close the valve. The person in the middle closed the water supply valve of section 5. The person above reported that the pressure holding pressure gauge dropped, and the person below reported that the pressure holding pressure gauge rose. The three groups of personnel opened the valve to restore the normal soft water. The situation of the upper dropping and the lower rising proved that the copper cooling vertical pipe of section 5 was damaged. Because the gas alarm reached the top in the high-gas area, the crew temporarily retreated safely to the inclined bridge opening to get some fresh air and clear their heads.

[0040] After determining the damaged section, under normal production conditions, a jump connection was made to the damaged copper cooling wall vertical pipe. The first group of three people in section 14 wore gas alarms, air respirators, and mobile phone headsets. They contacted the personnel on the water supply platform of section 1 of the furnace base, who wore gas alarms and mobile phone headsets, to stop the industrial water, and opened and closed the drain valves up and down. Pay attention to the wind direction below to prevent gas poisoning.

[0041] Two groups of three people wear gas alarms, air respirators, fasten safety ropes, and wear mobile phone headsets. On the second-floor corridor platform of Section 7 of the furnace body, the first person heard that the first group and the third group of personnel were operating to drain the remaining water in the B29# cooling riser. The first person instructed the second person to hold the safety rope firmly, keep the mobile phone headset on for communication, and immediately climb down to contact the personnel in Section 6 and slowly release the safety rope. The third person wears an air respirator, fastens the safety rope, and wears a mobile phone headset, then climbs down beside the water supply valve in Section 6 of B29#. And mark the place on the water supply pipe entering Section 6 for drilling a Φ50 hole, welding a jump pipe nipple valve quickly. Then contact to release the safety rope and climb down to Section 5 to close the water supply valve of B29# in Section 5 (in this way, B29# - Section 5 - Block 14 - the 4th one is disconnected separately). Mark on the Φ25 valve pipe of the return water in Section 4 of B29# to cut it off, and use a hole cutter to enlarge the hole to Φ50, weld the jump pipe nipple valve nipple quick connection. Contact the second person to pull in and take back the safety rope and climb back up the original way, until a safe retreat, and rest while blowing wind at the inclined bridge opening.

[0042] The second group of personnel put on the air respirators and go to the second-floor platform corridor of Section 7. One person holds the safety rope firmly and slowly releases it. The welder fastens the safety rope and crawls down to the place where the Φ50 hole is marked by the pipe fitter in Section 6 of B29#. One person for production support lowers the hole cutter down for the welder to operate and cut the hole. The person above takes back the upper hose and the hole cutter, then lowers the welding wire and the pipe for preparing the nipple. The welder welds the nipple well. The personnel above and below often communicate via mobile phone headset about the physical safety situation. The person above takes in and pulls the welding wire. Lower the Φ25 flange that has been welded with a Φ25 nipple quick connector, and the personnel below insist on installing it well. Make a limit safe retreat in the high-gas area, rest while blowing wind at the inclined bridge opening. Replace the welder, who wears an air respirator and safety belt, climbs up from the 9th tuyere, cuts off the original Φ25 valve pipe of the return water in Section 4 of B29#, and cuts a Φ50 hole and welds the prepared jump connection nipple valve nipple quick connection. Two people below monitor. After welding, make a safe retreat to rest while blowing wind at the inclined bridge opening.

[0043] For the online jump pipe connection of the damaged cooling riser of the copper cooling stave with a Φ50 hose, and for the separate connection in Section 5, the formal Φ25 nitrogen charging and maintenance are carried out: The first group of personnel go to Section 14 to wait for orders. The first person of the second group of personnel climbs down beside the water supply valve in Section 6. The second person on the upper platform holds the safety rope firmly and communicates with the personnel below via mobile phone headset. The third person ties the Φ50 stainless steel metal hose for jump connection with a rope and slowly lowers it for the personnel below to receive the hose, and connect it for jump connection to the welded nipple quick connection in Section 6. Then the person above lowers another Φ25 stainless steel hose and connects it quickly to the Φ25 valve on the return water main pipe of B29# - Section 5. Make a safe retreat.

[0044] Continue to lower it to the tuyere platform. The third group of personnel has climbed onto the B29#-5 section, connected a Φ50 stainless steel hose with a length of 3.8 m by jumping, and connected it to the quick coupling of the threaded end that has been welded to the return water of the B29#-4 section, and then safely retreated to the side of the B29# water supply at section 1. Contact the personnel at section 14 to close the valve, then slowly open the soft return water a little. When the personnel at section 1 see the exhaust of the sewage pipe and the water is clean water, slowly fully open the B29# soft water supply valve and close the valve. Also fully open the return water valve above. Wait for 5 minutes after the B29# resumes normal soft water cooling. Close the valves up and down and the pressure gauge rises, indicating that the jumped hose is not leaking. The jump connection of the B29#-4 section return water to the section 6 supply to resume normal soft water cooling is safely completed.

[0045] Arrange a group of personnel to connect the nitrogen gas source to the valve on the side wall at the bottom end of the damaged pipeline, and let another group of personnel install a pressure sensor inside the other end. Connect the pressure sensor to the controller signal, and then connect the nitrogen gas storage device.

[0046] The controller controls the release of the nitrogen gas source, and pays attention to the pressure value fed back by the pressure sensor in real time. The controller automatically calculates the pressure at the leakage point, and then automatically adjusts the release pressure of the gas source to ensure that the air pressure at the penetration point is greater than the internal air pressure of the blast furnace.

[0047] As Figure 2 shown, based on the same technical concept of the above-mentioned embodiment, on the one hand, the present invention provides a nitrogen gas stamping protection system for an on-line treatment method after the damage of a blast furnace cooling stave, including: A blast furnace pressure detection module for dynamically monitoring the internal pressure of the high pressure; A pipeline nitrogen gas pressure detection module for dynamically monitoring the nitrogen gas pressure in the pipeline after the nitrogen gas passes through the damaged part of the cooling stave riser; A nitrogen gas control module for dynamically controlling the release amount of the external nitrogen gas source according to the internal pressure of the high pressure and the nitrogen gas pressure at the damaged part of the cooling stave riser fed back by the blast furnace pressure detection module and the pipeline nitrogen gas pressure detection module, so that the nitrogen gas pressure at the damaged part of the cooling stave riser is always greater than the internal pressure of the blast furnace.

[0048] This system is mainly integrated in the plc controller, forming function modules such as blast furnace pressure detection, pipeline nitrogen gas pressure detection, and nitrogen gas control, providing a systematic and automated solution for the on-line treatment after the damage of the blast furnace cooling stave, greatly improving the efficiency and reliability of the treatment process; according to the data fed back by the blast furnace pressure detection module and the pipeline nitrogen gas pressure detection module, the nitrogen gas control module can dynamically control the release amount of the external nitrogen gas source in real time, ensuring that the nitrogen gas pressure at the damaged part of the cooling stave riser is always greater than the internal pressure of the blast furnace, realizing precise control and automated management of the entire treatment process, and further improving the safety and stability of production.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An on-line treatment method for a damaged blast furnace cooling stave, characterized in that Including: Online determine the damaged cooling stave riser pipe, and perform a jump connection on the cooling stave riser pipes adjacent to the damaged cooling stave; Connect the damaged cooling stave riser pipe to an external nitrogen gas source; Obtain the blast furnace internal pressure value as the hedging base number; Control the external nitrogen gas source to inject nitrogen into the damaged cooling stave riser pipe at a gas pressure higher than the hedging base number. After the nitrogen enters the damaged cooling stave riser pipe, it enters the blast furnace interior from the damaged part, so that the nitrogen pressure released at the damaged part is greater than the blast furnace internal pressure.

2. The on-line treatment method for a blast furnace cooling stave after breakage according to claim 1, characterized in that: When injecting nitrogen into the damaged cooling stave riser pipe, continuously monitor the change of the blast furnace internal pressure and the nitrogen pressure at the damaged part of the cooling stave riser pipe, and dynamically adjust the nitrogen release pressure of the external nitrogen gas source according to the change of the blast furnace internal pressure to ensure that the nitrogen pressure at the damaged part of the cooling stave riser pipe is always higher than the blast furnace internal pressure.

3. The online treatment method for a blast furnace cooling stave after breakage according to claim 2, characterized in that: Monitoring the nitrogen pressure at the damaged part of the cooling stave riser pipe includes: Install a gas pressure sensor inside the damaged cooling stave riser pipe; Connect the gas pressure sensor to the controller through a wireless signal; The controller continuously obtains the gas pressure data transmitted by the gas pressure sensor, which is the internal gas pressure of the pipeline. The nitrogen pressure at the damaged part of the cooling stave riser pipe can be obtained by subtracting the internal gas pressure of the pipeline from the gas source release pressure.

4. An online treatment method for a blast furnace cooling stave after breakage according to claim 1, characterized in that: The value that the nitrogen pressure at the damaged part of the cooling stave riser pipe is always higher than the blast furnace internal pressure ranges from 0.5 to 1.2 MPa.

5. The on-line treatment method for a blast furnace cooling stave after breakage according to claim 1, characterized in that: The determination of the damaged position of the cooling stave riser pipe includes: Form a pressure holding state by closing the return water valves and corresponding water supply valves of each layer of the cooling riser pipes one by one, and judge whether there is damage to the cooling riser pipe and the specific layer of damage according to the change of the pressure gauge value; If the decrease amplitude of the pressure gauge value exceeds the threshold value, the cooling riser pipe is in a damaged and leaking state; If there is no external leakage phenomenon and the change amplitude of the pressure gauge value exceeds the threshold value, it is judged as internal leakage.

6. The online treatment method for a blast furnace cooling stave after breakage according to claim 1, characterized in that: Performing a jump connection on the cooling stave riser pipes adjacent to the damaged cooling stave includes: Disconnect the valves at both ends of the damaged cooling stave riser pipe; Open holes and weld jump connection pipe heads on the two adjacent cooling stave riser pipes above and below the damaged cooling stave riser pipe, install quick connectors, and then connect the two quick connectors through pipes to avoid the damaged cooling stave riser pipe.

7. The on-line treatment method for a blast furnace cooling stave after breakage according to claim 1, characterized in that: Connecting the damaged cooling stave riser pipe to an external nitrogen gas source includes: Connect one end of the damaged cooling stave riser pipe to the output end of the external nitrogen gas source; Connect the other end of the damaged cooling stave riser pipe to the nitrogen storage equipment of the external nitrogen gas source to form a closed loop for the nitrogen flow direction.

8. A nitrogen pressing protection system for the on-line treatment method after the breakage of the blast furnace cooling stave according to any one of claims 1-7, characterized in that, Including: A blast furnace pressure detection module for dynamically monitoring the high-pressure internal pressure; A pipeline nitrogen pressure detection module for dynamically monitoring the nitrogen pressure in the pipeline after the nitrogen passes through the damaged part of the cooling stave riser pipe; A nitrogen control module for dynamically controlling the release amount of the external nitrogen gas source according to the high-pressure internal pressure and the nitrogen pressure at the damaged part of the cooling stave riser pipe fed back by the blast furnace pressure detection module and the pipeline nitrogen pressure detection module, so that the nitrogen pressure at the damaged part of the cooling stave riser pipe is always greater than the blast furnace internal pressure.

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