Device and method for online treatment of spray gun fault

Abstract

The device comprises a long-rod-shaped spray gun, the front end of the long-rod-shaped spray gun is a spraying opening, the rear end of the long-rod-shaped spray gun is connected with an alkali liquor conveying pipe, a sleeve is arranged on the periphery of the long-rod-shaped spray gun, an isolation rotating core valve is arranged on the sleeve, and the long-rod-shaped spray gun can penetrate through a through hole in the middle of a valve element of the isolation rotating core valve; the sleeve is divided into a sleeve front section and a sleeve rear section by the isolation ball valve, the head of the sleeve front section extends into the blast furnace gas conveying pipeline, the side wall of the sleeve front section is fixedly and hermetically connected with the side wall of the blast furnace gas conveying pipeline, and a shaft sealing facility capable of penetrating through the long-rod-shaped spray gun is arranged at the tail end of the sleeve rear section. The characteristic that the spray gun can penetrate through the through hole in the middle of the isolation rotary core valve is utilized, and a shaft sealing facility is matched, so that the spray gun can enable a gas pipe to be drawn out and inserted into a gas supply gas channel in an on-line gas supply state, the spray gun can be maintained or replaced on line at any time, the spray gun can be kept in the optimal working state, the detoxification efficiency is improved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to an online processing device and method for gun failure, an auxiliary device and method for environmental protection facilities, and an auxiliary device and method for a gas pipeline detoxification facility of a blast furnace gas desulfurization system. BACKGROUND

[0002] The blast furnace gas dry method fine desulfurization agent detoxification device is installed on the gas pipeline after the bag-type dust collector, and a newly developed alkaline complex liquid detoxification agent is sprayed in through a high-pressure atomizing fine nozzle for uninterrupted spraying and high-efficiency reaction with chlorine-containing substances and related acidic salt substances in the gas. Meanwhile, the adsorption characteristics of the dust in the blast furnace gas are utilized to remove most of the acidic toxic substances before the dechlorination agent, thereby maximizing the service life of the desulfurization agent. However, during the spraying of the alkaline complex liquid detoxification agent, the alkali gun body and the nozzle are always corroded and worn by the gas and affected by alkali crystallization, which cannot be safely and effectively operated for a long period, and the gun cannot be processed online during the blast furnace operation, but can only be processed during the limited blast furnace shutdown, which greatly affects the service life guarantee of the desulfurization agent. SUMMARY

[0003] In order to overcome the problems of the prior art, the present application provides an online processing device and method for gun failure. The device is provided with a set of pipeline and valve system, and the method is operated, so that the gun can be installed or removed online during the blast furnace operation, thereby improving the production efficiency and reducing the cost.

[0004] The purpose of the present application is achieved by an online processing device for gun failure, which comprises a long rod-shaped gun with a flat and smooth outer surface, a alkali injection port at the front end of the long rod-shaped gun, a alkali valve connected with a alkali conveying pipe at the rear end of the long rod-shaped gun, a sleeve provided around the long rod-shaped gun, an isolation core valve provided on the sleeve, a through hole in the middle of the valve core of the isolation core valve capable of penetrating the long rod-shaped gun, the isolation core valve dividing the sleeve into a front section and a rear section, the head of the front section of the sleeve inserted into the blast furnace gas conveying pipeline, the side wall of the front section of the sleeve fixedly and airtightly connected with the side wall of the blast furnace gas conveying pipeline, the tail end of the rear section of the sleeve provided with a shaft sealing device capable of penetrating the long rod-shaped gun, and a diffusion pipe provided on the side wall of the rear section of the sleeve and provided with a diffusion valve.

[0005] Further, the isolation core valve is a ball valve.

[0006] Further, a pressure gauge is further provided on the side wall of the rear section of the sleeve.

[0007] Further, the connection between the front section wall of the sleeve and the side wall of the blast furnace gas conveying pipeline is that the side wall of the blast furnace gas conveying pipeline is tightly welded with a flange plate as an interface base, the front section wall of the sleeve is welded with a corresponding butt flange plate, and a sealing device is arranged between the two flange plates and fastened with bolts.

[0008] Further, the lye valve and the diffusion valve are ball valves.

[0009] Further, the front end of the lye conveying pipe connected with the lye valve is a flexible hose.

[0010] Further, the shaft sealing device comprises a sealing cover and a sealing ring.

[0011] Further, the long rod-shaped spray gun is provided with an insertion limiter.

[0012] Further, the long rod-shaped spray gun is provided with a half-insertion and half-withdrawal position marker.

[0013] A method for processing an online spray gun fault using the above device, the method comprising an insertion process and a withdrawal process, and the specific steps are as follows: Online insertion process: Step 1, confirming the valve state: confirming that the isolation valve and the lye valve are in a closed state, and the diffusion valve is in an open state; Step 2, half-inserting the long rod-shaped spray gun: inserting the long rod-shaped spray gun from the hole of the shaft sealing device at the tail end of the rear section of the sleeve, so that the front end nozzle of the long rod-shaped spray gun approaches the valve core of the isolation valve, half-fastening the shaft sealing device, and closing the diffusion valve; Step 3, fully inserting the long rod-shaped spray gun: confirming that the diffusion valve is closed, opening the isolation valve, aligning the through hole in the valve core with the valve flow channel, quickly inserting the long rod-shaped spray gun through the through hole of the valve core of the isolation valve, inserting the long rod-shaped spray gun into the front section of the sleeve, so that the nozzle of the long rod-shaped spray gun enters the working position in the blast furnace gas conveying pipeline, and locking the shaft sealing device; Step 4, normal working: opening the lye valve, injecting lye, and spraying lye in the blast furnace gas conveying pipeline; Online withdrawal process: Step 5, preparing for operation: confirming the working state of each valve: the isolation valve is kept in an open state, the diffusion valve is in a closed state, and the lye valve is in an open state; performing valve operation: closing the lye valve and preparing to loosen the locked shaft sealing device; Step 6, half-extracting long rod-shaped spray gun: loosening shaft sealing device, once reaching the long rod-shaped spray gun can be extracted state, stop loosening shaft sealing device, extraction action cannot stop, continue to extract the long rod-shaped spray gun outward, when the head of the long rod-shaped spray gun is extracted to the valve core of the isolation valve core valve, immediately rotate the valve core, make the isolation valve core valve become closed state, at this time stop extracting the long rod-shaped spray gun, and lock the shaft sealing device; Step 7, completely extracting long rod-shaped spray gun: opening the diffuser valve, releasing the gas in the sleeve pipe rear section to the atmosphere, then loosening the shaft sealing device, completely extracting the long rod-shaped spray gun from the sleeve pipe rear section, completing the online extraction process of the long rod-shaped spray gun.

[0014] The advantages and beneficial effects of the present application are: the present application uses the through hole in the middle of the isolation valve core valve to pass through the characteristics of the spray gun, cooperates with the shaft sealing device, so that the spray gun can be extracted and inserted into the gas supply gas in the state of online gas supply of the gas pipe, realizes the online maintenance or replacement of the spray gun at any time, makes the spray gun maintain in the best working state, improves the detoxification efficiency, and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in conjunction with the drawings and examples.

[0016] Figure 1 It is a structural schematic diagram of the device described in embodiment one of the present application, which is a full insertion state of the long rod-shaped spray gun; Figure 2 It is a structural schematic diagram of the device described in embodiment one of the present application, which is a half insertion state of the long rod-shaped spray gun; Figure 3 It is a flow chart of the method described in embodiment ten of the present application. DETAILED DESCRIPTION

[0017] Embodiment one: The present embodiment is a device for online processing spray gun failure, as shown in Figure 1 , 2 The present embodiment includes: long rod-shaped spray gun 1 with flat, smooth and straight outer surface, the front end 101 of the long rod-shaped spray gun is a lye injection port, the rear end 102 is connected with lye conveying pipe 3 through lye valve 2, the periphery of the long rod-shaped spray gun is provided with sleeve 4, the sleeve is provided with isolation valve core valve 5, the through hole 501 in the middle of the valve core of the isolation valve core valve can pass through the long rod-shaped spray gun, the sleeve is divided into sleeve front section 401 and sleeve rear section 402 by the isolation valve core valve, the head of the sleeve front section is inserted into blast furnace gas conveying pipeline 6, the sleeve front section wall is fixedly and tightly connected with the side wall of the blast furnace gas conveying pipeline, the tail end of the sleeve rear section is provided with shaft sealing device 7 which can pass through the long rod-shaped spray gun, the side wall of the sleeve rear section is further provided with diffuser pipe 8, the diffuser pipe is provided with diffuser valve 9, as shown in Figure 1、 2 is shown in FIG. 1, Figure 1 is a full insertion state of the long rod-shaped spray gun into the blast furnace gas conveying pipeline, Figure 2 is a state of the long rod-shaped spray gun half inserted into the sleeve, i.e. the front section of the long rod-shaped spray gun reaches a position before the isolation rotating valve core, at which time the valve core of the isolation rotating valve is in a closed state.

[0018] The "long rod, long tube" in the embodiment refers to a long rod member or a long tube member with a length-diameter ratio exceeding 5. The long rod-shaped spray gun is an elongated metal tube, the front end of the tube is a liquid injection port, and the tube is used to inject lye in the blast furnace gas conveying pipeline. In order to be well inserted and pass through the hole in the middle of the valve core of the isolation rotating valve, the front end of the tube is preferably conical. The rear end of the tube is connected to a lye input tube at the end face or the side face. The outer circular surface of the tube of the long rod-shaped spray gun is smooth and straight, and the outer surface is consistent, which can be well matched with the sealing member of the shaft sealing device to form a tight sealing structure, and the long tube can be smoothly moved in the sealing member of the shaft sealing device without damaging the sealing member.

[0019] The key facility of the embodiment is the sleeve. The sleeve is a metal tube with a diameter larger than that of the spray gun tube, the front section of the sleeve is inserted into the blast furnace gas conveying pipeline, and a isolation rotating valve is arranged in the middle of the sleeve to enable the spray tube to pass through the through hole in the middle of the isolation rotating valve and enter the gas pipeline. The rear section of the sleeve is provided with a sealing device to minimize gas leakage. The sleeve is usually inserted into the blast furnace gas conveying pipeline in a manner that the central axis is perpendicular to the central axis of the gas pipeline, as shown in FIG. 2, Figure 1 、 2 as shown in FIG. 3, or in a manner slightly larger or smaller than 90 degrees, which is mainly based on the installation situation on site and whether other equipment interferes with the spray gun.

[0020] The isolation rotating valve can be a general ball valve or a cylindrical valve, i.e. the valve core is spherical or cylindrical. The principle of the rotating valve is that a hole is arranged in the middle of the valve core, the valve core can rotate, and the flow passage in the valve seat can be aligned with the hole in the valve core or completely blocked by the valve core, which forms the opening and closing of the valve. The hole in the middle of the valve core in the embodiment is used as the opening and closing valve and as the passage through which the spray gun passes, thereby realizing the online disassembly and assembly of the spray tube. The valve core of the isolation rotating valve can be spherical or cylindrical. A pressure gauge or a pressure sensor is further arranged on the side wall of the rear section of the sleeve to monitor the pressure in the rear section of the sleeve.

[0021] The sleeve front section side wall and the blast furnace gas conveying pipeline side wall can be flanges. The lye valve and the diffusion valve can be ball valves or screw pressure valves.

[0022] The front end of the lye conveying pipe connected to the lye valve is a flexible hose. The lye conveying pipe can be connected to the side wall of the spray gun or mounted on the end face of the tail section of the spray gun.

[0023] Shaft sealing devices come in various forms, such as using a threaded clamping cap as a sealing and locking device. The clamping cap has an elastic sealing ring inside, and the spray gun rod passes through the sealing ring and is clamped by the sealing and locking device to form a fixed seal.

[0024] To ensure the long-handled spray gun is quickly and accurately inserted, a limit switch can be installed on the gun rod. This allows the operator to quickly determine if the gun is fully inserted, improving efficiency while preventing gas leaks and reducing safety hazards. Similarly, a half-insertion / withdrawal position mark can be added to the long-handled spray gun. This mark is made when the gun is inserted or withdrawn before reaching the valve core of the isolation rotary valve, enabling rapid opening or closing of the valve.

[0025] Example 2: This embodiment is an improvement upon Embodiment 1, a refinement of the isolation rotary valve described in Embodiment 1. The isolation rotary valve in this embodiment is a ball valve, such as... Figure 1 , 2 As shown.

[0026] The ball valve seat has a medium flow channel, and the ball valve core is positioned in the center of this channel. The ball valve core also has a medium flow channel. When the channel on the valve seat aligns with the channel on the valve core, such as... Figure 1 As shown, the valve is in the open position; when the handle is moved (or rotated by a motor), the valve core rotates 90 degrees, and the axis of the valve seat channel differs from that of the valve core channel by 90 degrees. The valve core completely blocks the channel on the valve seat, as shown. Figure 2 As shown, the valve is in the closed state. This embodiment cleverly utilizes the channel in the middle of the ball valve core as the channel for the spray gun to enter the gas pipeline, thereby realizing the function of online disassembly and assembly of the spray gun.

[0027] Example 3: This embodiment is an improvement on the above embodiment, and is a refinement of the above embodiment regarding the rear section of the casing. In this embodiment, a pressure gauge is also provided on the side wall of the rear section of the casing.

[0028] Pressure gauges are the most common pressure display devices and can be installed on the back of the casing in a very simple way.

[0029] Example 4: This embodiment is an improvement upon the above embodiment, detailing the aspect of the front section wall of the casing. In this embodiment, the connection between the front section wall of the casing and the side wall of the blast furnace gas transmission pipeline is as follows: a flange plate 601 serving as the interface base is welded to the side wall of the blast furnace gas transmission pipeline in a sealed manner; a corresponding mating flange plate 403 is welded to the side wall of the front section of the casing; a sealing device is provided between the two flange plates, and they are secured with bolts 602. Figure 1 , 2as shown.

[0030] One disc of the flange is welded on the gas pipeline, and the other disc is welded with the sleeve, so that the entire online processing lance failure device can be disassembled as a whole by disassembling the bolts of the flange in case of problems, of course, such disassembly can only be carried out in the state of stopping gas supply.

[0031] Example Five: This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the lye valve and the diffusion valve. The lye valve and the diffusion valve described in this embodiment are ball valves.

[0032] Ball valves are the most common valves, with the advantages of small size and mature technology. They can be directly connected with the sleeve through the pipe threads on the valve seat, with good processability.

[0033] Example Six: This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the lye delivery pipe. The front end of the lye delivery pipe connected with the lye valve is a flexible hose.

[0034] The flexible hose is used at the front end of the lye delivery pipe connected with the lye valve, in order to facilitate the connection with the long rod-shaped lance during the insertion and extraction process, to facilitate use and improve work efficiency.

[0035] Example Seven: This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the shaft sealing device. The shaft sealing device described in this embodiment includes a sealing cover 701 and a sealing ring 702, as shown in Figure 1 , 2 .

[0036] This embodiment is provided with threads around the tail of the rear section of the sleeve, and a threaded sealing cover is provided. The elastic sealing ring is fitted on the lance rod, and is pressed against the cross section of the tail of the rear section of the sleeve. By rotating the sealing cover, the sealing ring can be tightened or loosened, achieving the function of locking or loosening the long rod-shaped lance.

[0037] Example Eight: This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the long rod-shaped lance. The long rod-shaped lance described in this embodiment is provided with an insertion limiter.

[0038] The limiter can be a circular ring that can be fixed on the outer circular surface of the long rod-shaped lance, and can be fixed in place.

[0039] Example Nine: This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment about the long rod-shaped lance. The long rod-shaped lance described in this embodiment is provided with a half-insertion and extraction position mark.

[0040] The half-insertion and extraction position mark is a notch line provided on the outer cylindrical surface of the long rod-shaped lance. During the insertion and extraction process, once the notch line is reached, it means that the head of the long rod-shaped lance has reached a position before the valve core of the isolation rotating core valve, and the isolation rotating core valve can be opened or closed.

[0041] Embodiment Ten This embodiment is a method for online processing of lance faults using the device described in the above-mentioned embodiments. The method includes an insertion process and an extraction process, as shown in Figure 3 The focus of this embodiment is to dismount and install the long rod-shaped lance while the blast furnace is still normally supplied with gas. Before this, a flange plate serving as a mounting interface base needs to be seal-welded at a suitable position on the sidewall of the blast furnace gas pipeline in a gas-stopped state. A corresponding flange plate is seal-welded with the front section of the sleeve, and the two plates are then seal-coupled using bolts, so that the front section of the sleeve, as well as a series of facilities such as the isolation rotating core valve, the diffuser pipe and diffuser valve, and the pressure gauge, are installed on the sidewall of the gas pipeline. The specific steps are as follows: Online insertion process: Step 1: Confirm the valve state: confirm that the isolation rotating core valve and the caustic soda valve are in the closed state, and the diffuser valve is in the open state. Since gas is a flammable and explosive gas and is also toxic, once a person inhales it, dizziness, nausea, and even oxygen deficiency and death may occur. Therefore, special care must be taken to prevent gas leakage. Even if leakage occurs in an emergency, the amount of leakage must be strictly controlled. The operator must wear a positive pressure respirator, and special attention must be paid to the diffusion space of the leaked gas to avoid deflagration and personal injury.

[0042] Since this embodiment is to install or dismount the long rod-shaped lance online, it is very important to prevent gas leakage during the process of dismounting and installing the long rod-shaped lance, and the safety of the equipment and personnel. Before the long rod-shaped lance is inserted into the pipeline, the most critical thing is that the isolation rotating core valve must be closed to prevent gas from leaking from the blast furnace gas delivery pipeline through the sleeve. At this time, since the long rod-shaped lance has not been inserted into the sleeve, the shaft sealing facility at the end of the rear end of the sleeve is open, and the diffuser valve is also open. If the isolation rotating core valve is not closed, a large amount of gas will leak. This situation must be avoided at all costs, so the isolation rotating core valve must be closed before the long rod-shaped lance is inserted.

[0043] Step 2: Half-insert the long rod-shaped lance: insert the long rod-shaped lance from the hole of the shaft sealing facility at the end of the rear end of the sleeve, so that the front end of the long rod-shaped lance approaches the valve core of the isolation rotating core valve, half-fasten the shaft sealing facility, and close the diffuser valve. When the nozzle of the long rod-shaped lance approaches the valve core of the isolation valve, the installer cannot see it if there is no mark on the long rod-shaped lance, so a mark should be made on the long rod of the long rod-shaped lance at an appropriate position to indicate the position of the long rod-shaped lance when it is inserted. When the mark is reached, stop inserting, so as to avoid the head of the lance colliding with the valve core of the isolation valve, damaging the equipment, and make the head of the long rod-shaped lance approach the valve core as much as possible, so that the long rod can be inserted into the front section of the sleeve in the shortest time, and the shaft sealing device is locked as soon as possible to minimize gas leakage.

[0044] When the long rod-shaped lance is inserted, if the diffuser valve is closed and the shaft sealing device has good sealing effect, the space in the rear section of the sleeve is in a closed state, and the air in the rear section of the sleeve will prevent the long rod-shaped lance from being inserted. Therefore, during the process of inserting the long rod-shaped lance into the rear section of the sleeve, the diffuser valve needs to be opened to make the air in the rear section of the sleeve flow, so that the long rod-shaped lance can be easily inserted into the rear section of the sleeve, but before the ball valve is opened, it is necessary to detect whether the diffuser valve is closed.

[0045] The shaft sealing device can be in a relaxed state when the long rod-shaped lance is inserted into the rear section of the sleeve, so that the long rod-shaped lance can be easily inserted into the rear section of the sleeve, but when the head (nozzle) of the long rod-shaped lance approaches the valve core of the isolation valve, in order to minimize the leakage of gas through the sleeve when the isolation valve is opened, the shaft sealing device must be in a semi-sealing state, that is, the long rod-shaped lance can easily pass through the hole in the center of the valve core of the isolation valve and enter the blast furnace gas conveying pipeline through the front section of the sleeve, and prevent gas from leaking along the gap between the front section of the sleeve, the valve core of the opened isolation valve, the rear section of the sleeve and the hole in the center of the shaft sealing device and the long rod. Therefore, the shaft sealing device can only be in a semi-sealing state. Once the long rod is in place, the shaft sealing device must be immediately locked to cut off the leakage path.

[0046] Step 3, fully insert the long rod-shaped lance: confirm that the diffuser valve is closed, open the isolation valve to align the through hole in the valve core with the valve flow passage, quickly pass the long rod-shaped lance through the through hole in the valve core of the isolation valve, and insert it into the front section of the sleeve, so that the nozzle of the long rod-shaped lance enters the working position in the blast furnace gas conveying pipeline, and the shaft sealing device is locked. Because the shaft sealing device is in a semi-locked state during insertion, gas may leak due to the not very tight locking, so the insertion process should try to minimize the waste of time. Therefore, an insertion limiter needs to be provided on the long rod, and once the long rod-shaped lance is inserted in place, that is, the insertion limiter is positioned at the tail end of the sleeve (shaft sealing device), the shaft sealing device is immediately locked to minimize gas leakage.

[0047] This step is the key step of this embodiment. In this step, the long rod-shaped spray gun passes through the through hole in the center of the isolation rotating valve core, and the isolation state of the front and rear sections of the sleeve pipe is changed into a passage, and the passage is changed into isolation when the long rod-shaped spray gun is repaired, so that the on-line replacement and repair of the long rod-shaped spray gun in the non-stop state are successfully realized.

[0048] Step 4, normal operation: open the lye valve, put the lye into operation, and spray the lye in the blast furnace gas conveying pipeline; At this point, the on-line insertion process is completed, the isolation rotating valve is kept open, the diffuser valve is closed, and the lye valve is kept open to supply lye. At this time, the head of the long rod-shaped spray gun is in the blast furnace gas conveying pipeline, and the entire long rod-shaped spray gun is completely inserted into the sleeve pipe, as shown in Figure 1 .

[0049] On-line extraction process: after a period of normal lye spraying operation, the long rod-shaped spray gun needs to be repaired. At this time, the isolation rotating valve is open, and the valve core cannot be rotated because the long rod passes through the valve core. At this time, the diffuser valve is closed, and the shaft sealing device is also in a completely locked state to prevent gas leakage in the sleeve pipe. At the same time, the lye valve is open, and the lye is sprayed normally.

[0050] Step 5, preparation operation: confirm the working state of each valve: the isolation rotating valve is kept open, the diffuser valve is closed, and the lye valve is open; valve operation: close the lye valve and prepare to loosen the locked shaft sealing device; Since it is an on-line operation, great care must be taken to prevent gas leakage, so the working state of each valve must be confirmed before operation, and then other operations are performed. At the same time, the on-site operator must wear a positive pressure respirator. The first operation to be performed is to close the lye valve to stop spraying lye in the gas pipeline. Then prepare to loosen the shaft sealing device, such as checking the surrounding environment, whether there are unsafe factors, whether there are fire sources, whether the air is flowing, etc. At the same time, the position of the long rod-shaped spray gun should be grasped so that once the locked shaft sealing device is opened, the long rod-shaped spray gun can be pulled out as soon as possible.

[0051] Step 6, half extraction of the long rod-shaped spray gun: loosen the shaft sealing device, and once the long rod-shaped spray gun can be extracted, stop loosening the shaft sealing device, continue to extract the long rod-shaped spray gun, and when the head of the long rod-shaped spray gun is extracted to be separated from the valve core of the isolation rotating valve, immediately rotate the valve core to change the isolation rotating valve into a closed state. At this time, stop extracting the long rod-shaped spray gun and lock the shaft sealing device; When the long rod-shaped lance is being pulled out, the shaft sealing device prevents the long rod-shaped lance from being pulled out, so that the long rod-shaped lance cannot be pulled out. Therefore, the shaft sealing device needs to be loosened before the long rod-shaped lance is pulled out, but this will also cause gas leakage. Therefore, the time when the shaft sealing device is loosened before the isolation valve is closed should be monitored, that is, the possibility of gas leakage should be reduced.

[0052] This step is opposite to step 3. Step 3 changes the front end and the rear section of the sleeve into a channel, and this step changes the front section and the rear section of the sleeve into isolation. At this time, the rotation of the valve core of the isolation valve is 90 degrees, the center axis of the hole in the valve core is 90 degrees with the axis of the flow channel on the valve seat, and the valve core completely blocks the flow channel, that is, the isolation valve is in a completely closed state, and the leakage channel of the gas through the sleeve is blocked. However, at this time, the rear section of the sleeve is still full of gas, and cannot be opened at will.

[0053] Step 7: completely pull out the long rod-shaped lance: open the diffuser valve to release the gas in the rear section of the sleeve to the atmosphere, then loosen the shaft sealing device, and completely pull out the long rod-shaped lance from the rear section of the sleeve, to complete the process of pulling out the long rod-shaped lance online.

[0054] If a pressure gauge is arranged in the rear section of the sleeve, the pressure gauge can be observed after the isolation valve is closed. When the pressure drops, the diffuser valve is opened, the internal gas is safely discharged until the pressure gauge is zero and no gas is discharged from the diffuser. At this time, the amount of gas in the rear section of the sleeve is very small, the shaft sealing device can be opened, and the lance can be pulled out as a whole, and the inside of the lance can be inspected, cleaned and repaired to restore the normal state of the lance.

[0055] Finally, it should be noted that the above is only used to illustrate the technical solutions of the present application and is not limited. Although the present application has been described in detail with reference to the preferred arrangement, those skilled in the art should understand that the technical solutions of the present application (such as the form of the lance, the use environment of the lance, the sequence of steps, etc.) can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An apparatus for online handling of spray gun malfunctions, comprising: A long, rod-shaped spray gun with a smooth, flat outer surface, has an alkali injection nozzle at its front end and is connected to an alkali delivery pipe via an alkali valve at its rear end. The spray gun is characterized by a sleeve surrounding it, with an isolation valve on the sleeve. The through-hole in the valve core of the isolation valve allows the spray gun to pass through. The isolation valve divides the sleeve into a front section and a rear section. The head of the front section extends into the blast furnace gas delivery pipe, and its sidewall is fixedly and sealed to the sidewall of the blast furnace gas delivery pipe. The tail end of the rear section is equipped with a shaft seal that allows the spray gun to pass through. A vent pipe with a vent valve is also provided on the sidewall of the rear section.

2. The apparatus according to claim 1, characterized in that, The isolation rotary valve mentioned above is a ball valve.

3. The apparatus according to claim 2, characterized in that, A pressure gauge is also provided on the side wall of the rear section of the casing.

4. The apparatus according to claim 3, characterized in that, The connection between the front section wall of the casing and the side wall of the blast furnace gas transmission pipeline is as follows: the side wall of the blast furnace gas transmission pipeline is sealed and welded with a flange as the interface base, and the front section wall of the casing is welded with a corresponding butt flange. A sealing device is provided between the two flanges and they are fastened with bolts.

5. The apparatus according to claim 4, characterized in that, The alkaline valve and the vent valve are ball valves.

6. The apparatus according to claim 5, characterized in that, The front end of the alkali delivery pipe connected to the alkali valve is a flexible hose.

7. The apparatus according to claim 6, characterized in that, The shaft sealing device includes a sealing cover and a sealing ring.

8. The apparatus according to claim 7, characterized in that, The long rod-shaped spray gun is equipped with an insertion limiter.

9. The apparatus according to claim 8, characterized in that, The long rod-shaped spray gun is marked with a half-insertion / withdrawal position mark.

10. A method for online handling of spray gun malfunctions using the apparatus of claim 9, characterized in that, The method includes an insertion process and an extraction process, and the specific steps are as follows: Online insertion process: Step 1, confirm valve status: confirm that the isolation rotary valve and alkali valve are in the closed position, and the vent valve is in the open position; Step 2, partially insert the long rod-shaped spray gun: Insert the long rod-shaped spray gun into the hole of the shaft seal at the end of the rear section of the sleeve, so that the front nozzle of the long rod-shaped spray gun is close to the valve core of the isolation rotary valve, partially tighten the shaft seal, and close the vent valve. Step 3, fully insert the long rod-shaped spray gun: Confirm that the vent valve is closed, open the isolation rotary valve, align the through hole in the valve core with the valve flow channel, quickly pass the long rod-shaped spray gun through the through hole of the isolation rotary valve core, insert it into the front section of the sleeve, so that the nozzle of the long rod-shaped spray gun enters the working position in the blast furnace gas transmission pipeline, and lock the shaft seal. Step 4, Normal Operation: Open the alkali valve, start the alkali supply, and spray the alkali into the blast furnace gas transmission pipeline; Online extraction process: Step 5, Preparation for Operation: Confirm the working status of each valve: keep the isolation rotary valve open, the vent valve closed, and the alkali valve open; Perform valve operation: close the alkali valve and prepare to loosen the locked shaft seal. Step 6, partially withdraw the long rod-shaped spray gun: Loosen the shaft seal. Once the long rod-shaped spray gun can be withdrawn, stop loosening the shaft seal. The withdrawal action cannot be stopped. Continue to withdraw the long rod-shaped spray gun outward. When the head of the long rod-shaped spray gun has been withdrawn to the point where it has separated from the valve core of the isolation rotary valve, immediately rotate the valve core to close the isolation rotary valve. At this point, stop withdrawing the long rod-shaped spray gun and tighten the shaft seal. Step 7, Completely remove the long rod-shaped spray gun: Open the vent valve to release the gas filling the rear section of the casing into the atmosphere, then loosen the shaft seal and completely remove the long rod-shaped spray gun from the rear section of the casing, completing the online removal process of the long rod-shaped spray gun.

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