An on-line cleanable blast furnace tuyere and on-line cleaning device

Abstract

The utility model relates to a kind of blast furnace tuyere straight blow pipe and online cleaning device that can be cleaned online, including straight blow pipe and detachable fixed installation end cap in the end of straight blow pipe, end cap has central through-hole, detachable fixed installation plug is equipped on end cap, plug has through-hole, when plug is installed to end cap, the axis of through-hole and central through-hole coincides, the front end of ball valve is sealedly connected with through-hole, the rear end of ball valve is detachably sealed and fixedly connected camera head assembly, online cleaning device includes for replacing camera head assembly under the condition of online cleaning state marble valve and for cleaning blockage pipe fitting.When cleaning is needed, first close the ball valve, quickly remove the camera head assembly and install the marble valve, pass the pipe through the connecting hole and push up the valve core of the marble valve, open the ball valve, continuously push the pipe forward to make it enter the straight blow pipe, realize online cleaning of coking or blockage in the straight blow pipe, and ensure the stability of blast furnace operation.

Description

Technical Field

[0001] This utility model relates to a technology for treating blockages in the direct blowing pipe of a blast furnace tuyere platform, specifically to a blast furnace tuyere direct blowing pipe that can be cleaned online and an online cleaning device. Background Technology

[0002] In blast furnace production, stable and smooth operation of the tuyere area is crucial for ensuring efficient smelting. On the one hand, during pulverized coal injection, some pulverized coal fails to burn completely at the tuyere tip, forming coke deposits. The pulverized coal flow impacts these coke deposits, causing refraction. The deflected coal flow continuously and at high speed erodes the inner wall of the tuyere sleeve, leading to localized burn-out. On the other hand, refractory material falling off from the direct-fired pipe or inside the tuyere can block the pipe channel, affecting the stability of airflow and pressure, disrupting the normal airflow distribution in the blast furnace, and impacting furnace operation. The blockage can also cause abnormal local wind speeds, and over time, this can lead to serious accidents such as burn-through of the direct-fired pipe or tuyere sleeve.

[0003] Traditional methods require waiting until the blast furnace is shut down before replacement or cleaning can be carried out, which not only delays the process but also seriously affects the technical and economic indicators and stable operation of the blast furnace.

[0004] Based on this, in order to clear the blockage of the blast furnace tuyeres without stopping the blast when it is observed to be blocked, an online cleaning device for the blast furnace tuyeres and an online cleaning system were designed to maintain the stability of blast furnace operation. Summary of the Invention

[0005] This utility model provides an online cleaning device for a blast furnace tuyere direct-blowing pipe. When cleaning is required, first close the ball valve, then quickly remove the camera assembly and install the ball valve. After passing the pipe through the connection hole, push up the valve core of the ball valve, open the ball valve, and continuously push the pipe forward to enter the direct-blowing pipe. This enables online cleaning of coke or blockages in the direct-blowing pipe, ensuring the stable operation of the blast furnace.

[0006] The technical solution adopted by this utility model is: a blast furnace tuyeres direct blowing pipe that can be cleaned online, including a direct blowing pipe and an end cap that is detachably and fixedly installed at the end of the direct blowing pipe. The end cap has a central through hole, and a plug is detachably and fixedly installed on the end cap. The plug has a through hole. When the plug is installed on the end cap, the axis of the through hole coincides with the axis of the central through hole. The through hole seals and connects to the front end of a ball valve, and the rear end of the ball valve is detachably, sealed, and fixedly connected to a camera assembly.

[0007] Based on the above scheme, as a preferred option, the through hole is an internally threaded hole.

[0008] Based on the above scheme, as a preferred option, the plug includes an integrally formed first connecting block and a second connecting block. The thickness of the first connecting block decreases linearly from top to bottom, and the end face of the first connecting block facing away from the second connecting block contacts and fits with the outer end face of the end cap.

[0009] Based on the above scheme, as a preferred option, a first L-shaped connector and a second L-shaped connector are fixedly installed on the outer end face of the end cap. The first L-shaped connector and the second L-shaped connector are symmetrically arranged to form a T-shaped groove. The first L-shaped connector includes a first connector fixed to the outer end face of the end cap and a second connector fixed to the end of the first connector. The distance between the second connector and the outer end face of the end cap decreases linearly from top to bottom.

[0010] Based on the above scheme, as a preferred option, the minimum distance between the second connector and the outer end face of the end cap is at least less than the maximum thickness of the first connector, and after the plug is inserted into the T-groove from the top, a sealed surface contact is formed between the plug and the end cap.

[0011] Based on the above scheme, as a preferred option, one right-angled side of the reinforcing angle plate is fixedly connected to the outer end face of the end cap, and the other right-angled side is fixedly connected to the first connector and the second connector, thereby reinforcing the connection between the first connector and the upper end face of the end cap, as well as the connection between the first connector and the second connector.

[0012] Based on the above scheme, as a preferred option, a crossbar is fixedly installed on the plug.

[0013] An online cleaning device is applied to the online cleaning blast furnace tuyere direct blowing pipe, including a ball valve for replacing the camera assembly in the online cleaning state and a pipe fitting for cleaning blockages. The front end of the ball valve is detachably sealed and fixedly connected to the rear end of a ball valve. A graphite packing is fixedly installed inside the rear end of the ball valve. The graphite packing has a connection hole for inserting the pipe fitting. The axis of the connection hole is in the front-back direction. The rear end of the pipe fitting is a solid body.

[0014] The present invention has the following technical advantages: The end cap features a detachable fixed-installation plug. The heavy stainless steel plug forms a wedge / pull-back structure with the end cap, achieving a tight and sealed connection with excellent sealing performance.

[0015] The first L-shaped connector, the second L-shaped connector, and the reinforcing angle plate that form the inverted groove are all components that are welded and fixed to the outer end face of the end cover afterward, without compromising the strength of the end cover itself and ensuring the service life of the product.

[0016] A crossbar is fixedly installed on the end cap to facilitate manual movement of the end cap for installation on site.

[0017] When cleaning is required, first close the ball valve, then quickly remove the camera assembly and install the ball valve. After passing the pipe through the connection hole, push up the valve core of the ball valve, open the ball valve, and continue to push the pipe forward to allow it to enter the direct-blown pipe. This enables online cleaning of coke or blockages in the direct-blown pipe, ensuring the stable operation of the blast furnace. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the interaction between the ball valve and the camera assembly; Figure 2 This is a schematic diagram of the combination of a ball valve and a ball valve; Figure 3 This is a schematic diagram of the fit between the end cap and the plug; Figure 4 It is a picture of the end cap and plug fitting together; Figure 5 This is a picture of the actual end cap; Figure 6 This is a picture of the actual plug; Figure 7 These are actual pictures of ball valves and spring valves; Figure 8 These are actual photos of the end caps, ball valves, and camera components. Detailed Implementation

[0019] To further understand this utility model, the following detailed description is provided in conjunction with embodiments. However, this is not intended to limit the scope of the utility model. It should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, and not for limiting the scope of the claims. Any equivalent substitutions made in the art based on the disclosure of this utility model are within the protection scope of this utility model.

[0020] like Figure 1-8 As shown, a blast furnace tuyere direct blowing pipe includes a direct blowing pipe 1 and an end cap 2 that is detachably fixedly installed at the end of the direct blowing pipe.

[0021] The end cap has a central through hole 3, and a plug 4 is detachably and fixedly installed on the end cap. The plug has a through hole 5, and when the plug is installed on the end cap, the axis of the through hole coincides with that of the central through hole.

[0022] The through hole is an internally threaded hole.

[0023] The front end of the ball valve 6 is sealed with a through hole, and the rear end of the ball valve is detachably sealed and fixedly connected to the camera assembly 7 (viewing hole assembly). When in use, the ball valve is in the open state, and the camera of the camera assembly takes pictures of the situation inside the blast furnace through the direct blow pipe.

[0024] The plug includes an integrally formed first connecting block 8 and a second connecting block 9. The thickness of the first connecting block decreases linearly from top to bottom, and the end face of the first connecting block facing away from the second connecting block contacts and fits with the outer end face of the end cap.

[0025] A first L-shaped connector and a second L-shaped connector are fixedly installed on the outer end face of the end cap. The first L-shaped connector and the second L-shaped connector are symmetrically arranged to form a T-shaped groove 10. The first L-shaped connector includes a first connector 11 fixed to the outer end face of the end cap and a second connector 12 fixed to the end of the first connector. The distance between the second connector and the outer end face of the end cap decreases linearly from top to bottom.

[0026] The minimum distance between the second connector and the outer end face of the end cap is less than the maximum thickness of the first connector. After the plug is inserted into the T-groove from the top, the plug is hammered down from the top with a hammer so that a sealed surface contact is formed between the plug and the end cap to prevent air leakage.

[0027] One right-angled side of the reinforcing angle plate 13 is fixedly connected to the outer end face of the end cap, and the other right-angled side is fixedly connected to the first connector and the second connector. This reinforces the connection between the first connector and the upper end face of the end cap, as well as the connection between the first connector and the second connector, to prevent damage to the first connector, the second connector, and the corresponding connection during the hammering of the plug.

[0028] Because the plug is made of stainless steel and is heavy, a crossbar is fixedly installed on the plug to facilitate manual movement.

[0029] In the scheme of this application, where fixed connections are involved, unless otherwise specified, the fixed connection method can be welding, bolting, etc. Detachable sealing fixation refers to threaded connection, and in the threaded connection, PTFE tape is wrapped around the external thread before connecting with the internal thread to form a seal. The PTFE tape is polytetrafluoroethylene (PTFE) PTFE tape, etc.

[0030] During use, when the camera detects blockage inside the direct blow pipe, an online cleaning device is used to clean it, avoiding shutdowns due to coking or blockage of the air outlet, significantly improving work efficiency and reducing the shutdown rate.

[0031] The online cleaning device includes a ball valve 14 and a pipe fitting. The front end of the ball valve is used to fix and seal the rear end of the ball valve. A graphite packing 15 is fixedly installed inside the rear end of the ball valve. The graphite packing has a connection hole for inserting the pipe fitting. The axis of the connection hole is in the front-to-back direction. The diameter of the connection hole is slightly larger than the diameter of the pipe fitting, such as 0.1 or 0.05 mm larger. The rear end of the pipe fitting is a solid body.

[0032] When cleaning is required, close the ball valve, remove the inspection port assembly, install the ball valve at the rear end of the ball valve, push up the valve core of the ball valve after the fitting passes through the connection hole, and a seal is formed between the graphite packing and the fitting to prevent gas leakage. Open the ball valve and continue to push the fitting forward to allow it to enter the direct blow pipe and clean the coking or blockage in the direct blow pipe.

[0033] Graphite packing is flexible, and the pipe can be up to 3 meters long. It can tilt within a small range using the graphite packing as a fulcrum, thereby achieving localized cleaning inside the direct-flow pipe.

[0034] The detachable and fixed inspection hole assembly at the rear end of the pipe fitting is used to observe whether the coking or blockage inside the direct blow pipe has been cleared. It is not necessary to completely remove the coking or blockage inside the direct blow pipe; cleaning only a portion is sufficient to keep the direct blow pipe running normally.

[0035] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that the above description is for illustrative purposes only and does not constitute any limitation on the scope of this utility model. Those skilled in the art can make substitutions or changes to certain features of this utility model without departing from the spirit and scope of this utility model, and such substitutions or changes should be considered to fall within the protection scope of the claims of this utility model.

Claims

1. A blast furnace tuyere direct-blowing pipe that can be cleaned online, characterized in that, It includes a direct blow pipe and a detachable end cap fixedly installed at the end of the direct blow pipe. The end cap has a central through hole and a plug is detachably fixedly installed on the end cap. The plug has a through hole. When the plug is installed on the end cap, the axis of the through hole coincides with the axis of the central through hole. The through hole seals the front end of the ball valve, and the rear end of the ball valve is detachably sealed and fixedly connected to the camera assembly.

2. The online-cleanable blast furnace tuyere direct-blowing pipe as described in claim 1, characterized in that, The through hole is an internally threaded hole.

3. The online-cleanable blast furnace tuyere direct-blowing pipe as described in claim 1, characterized in that, The plug includes an integrally formed first connecting block and a second connecting block. The thickness of the first connecting block decreases linearly from top to bottom. The end face of the first connecting block facing away from the second connecting block contacts and fits with the outer end face of the end cap.

4. The online-cleanable blast furnace tuyere direct-blowing pipe as described in claim 3, characterized in that, A first L-shaped connector and a second L-shaped connector are fixedly installed on the outer end face of the end cap. The first L-shaped connector and the second L-shaped connector are symmetrically arranged to form a T-shaped groove. The first L-shaped connector includes a first connector fixed to the outer end face of the end cap and a second connector fixed to the end of the first connector. The distance between the second connector and the outer end face of the end cap decreases linearly from top to bottom.

5. The online-cleanable blast furnace tuyere direct-blowing pipe as described in claim 4, characterized in that, The minimum distance between the second connector and the outer end face of the end cap is at least less than the maximum thickness of the first connector, and after the plug is inserted into the T-groove from above, a sealed surface contact is formed between the plug and the end cap.

6. The online-cleanable blast furnace tuyere direct-blowing pipe as described in claim 1, characterized in that, One right-angled side of the reinforcing angle plate is fixedly connected to the outer end face of the end cap, and the other right-angled side is fixedly connected to the first connector and the second connector, thereby reinforcing the connection between the first connector and the upper end face of the end cap, as well as the connection between the first connector and the second connector.

7. The online-cleanable blast furnace tuyere direct-blowing pipe as described in claim 1, characterized in that, A crossbar is fixedly installed on the end cap.

8. An online cleaning device, applied to the online-cleanable blast furnace tuyere direct-blowing pipe as described in any one of claims 1-7, characterized in that, It includes a ball valve for replacing camera components during online cleaning and a tube for clearing blockages. The front end of the ball valve is detachably sealed and fixedly connected to the rear end of the ball valve. A graphite packing is fixedly installed inside the rear end of the ball valve. The graphite packing has a connection hole for inserting the tube. The axis of the connection hole is in the front-back direction. The rear end of the tube is a solid body.

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