Water leakage repairing device for coiled pipe of cooling wall of blast furnace

Abstract

The utility model provides a water leakage repairing device for a coiled pipe of a cooling wall of a blast furnace, which aims at solving the technical problems that the coiled pipe of the cooling wall of the blast furnace is difficult to repair and poor in cooling effect after being repaired, and comprises a furnace shell, the cooling wall and the coiled pipe positioned in the cooling wall, the two ends of the coiled pipe are connected with a first water inlet pipe and a first water return pipe respectively, the first water inlet pipe and the first water return pipe extend out of the outer side of the furnace shell, the flexible pipes are arranged in the straight pipe sections of the coiled pipe respectively, and the two ends of each flexible pipe are fixedly connected with the furnace shell respectively; the even number of groups of connecting pipes are arranged at the joints of the straight pipe sections and the elbow sections of the coiled pipe and are connected with the hose, and the connecting pipe, the first water inlet pipe and the first water return pipe on the same straight pipe section are respectively a water inlet and a water return port of the cooling water loop; the coiled pipe cooling wall can be quickly repaired under the condition that the size of the corrugated pipe is not reduced, and the cooling effect is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to blast furnace cooling device technical field, especially a kind of blast furnace cooling wall serpentine pipe water leakage repair device. BACKGROUND

[0002] Blast furnace cooling wall is an important component of blast furnace in metallurgical industry, it is mainly used to protect the furnace shell from high temperature molten slag and hot gas flow erosion, and effectively conduct heat from the furnace, to maintain the internal temperature of blast furnace suitable operation, cooling wall is usually made of refractory material and cooling element, wherein cooling element is generally serpentine cooling water pipe, they are embedded or attached behind refractory material.

[0003] Blast furnace cooling wall water leakage has the following hidden trouble:

[0004] ① cooling wall water leakage causes furnace temperature to reduce, affect production;

[0005] ② cooling wall leaks a lot of water to furnace, high temperature gasification produces a large amount of hydrogen gas to form explosion;

[0006] ③ cooling wall breaks water, if remedy measure is not timely, easy to lead to cooling wall burnout, furnace shell burns through;

[0007] ④ damage blast furnace lining, easy to cause furnace condition not smooth, affect blast furnace life;

[0008] ⑤ cause blast furnace fuel consumption to rise, smelting cost increases;

[0009] ⑥ cause water content in coal gas to rise, blast furnace bag unloading is difficult, bag ash blocks pipeline.

[0010] Traditional treatment method of serpentine pipe water leakage in cooling wall: after finding cooling wall water leakage, reduce the cooling water volume of leakage point, but cooling capacity of cooling wall drops after water volume reduces, temperature difference rises, local boiling is easy to lead to continuous damage of cooling wall, only when blast furnace is overhauled and production is stopped, burn open leakage part, damage the overall structure of cooling wall, install cooling column to leakage part of cooling wall, similarly, there are problems in repair method of installing cooling column:

[0011] A. furnace shell opens 6-8 holes with diameter of 120mm, opening hole is too large and too much to affect strength and rigidity, lead to uneven stress distribution of furnace shell, especially form stress concentration area around hole, this stress concentration will reduce overall strength and rigidity of furnace shell, increase the risk of deformation or even rupture of furnace shell under high temperature and high pressure environment;

[0012] B. A large number of openings will damage the structural integrity of the furnace shell, reduce the effective load-bearing area, and thus reduce the furnace shell's resistance to internal pressure. This not only affects the stability of the blast furnace, but may also cause cracks or other structural damage to the furnace shell during use.

[0013] C. Installing cooling columns on damaged cooling walls requires burning corresponding holes into the intact wall. During oxygen burning, improper control of the angle and oxygen content can easily lead to the expansion of furnace shell burn-out. Excessive melting loss of the cooling wall can easily lead to furnace skin reddening and burn-through.

[0014] D. Damage to the cooling wall and subsequent installation of cooling columns may cause uneven temperature distribution, which will affect the overall stability of the blast furnace. Uneven temperature distribution may lead to uneven heating of the furnace shell, thereby affecting the operating efficiency and safety of the blast furnace.

[0015] E. The process of burning oxygen in the furnace shell and cooling walls generates high temperatures, dense smoke, and dust, leading to environmental pollution.

[0016] In addition, in the prior art, such as the blast furnace cooling wall water cooling pipe repair method disclosed in CN1204271C, corrugated pipes are laid by pressurization to replace the damaged water cooling pipes. However, the operation is complicated. Since the water pressure cannot be precisely controlled, the corrugated pipes are prone to bursting and cracking, resulting in water leakage. Moreover, since there are many bends inside the cooling wall, the size of the corrugated pipes needs to be reduced in order to pass through more than two bends. This method will lead to a reduction in the cooling intensity of the repaired cooling wall. Utility Model Content

[0017] This utility model provides a device for repairing water leakage in the serpentine tubes of blast furnace cooling walls, to solve the technical problems of difficult repair and poor cooling effect after repair. The technical solution adopted to achieve the above objective is as follows:

[0018] A device for repairing water leakage in a serpentine tube of a blast furnace cooling wall includes a furnace shell, a cooling wall, and a serpentine tube located within the cooling wall. The serpentine tube has a first inlet pipe and a first return pipe extending outside the furnace shell connected to its two ends, respectively. The device is characterized by further comprising:

[0019] Multiple sets of flexible hoses are provided, each set being installed within a straight section of the serpentine tube, and both ends of the flexible hoses are fixedly connected to the furnace shell.

[0020] The connecting pipe is provided with an even array of pipes, which are located at the connection between the straight and elbow sections of the serpentine pipe and connected to the flexible hose. The connecting pipe, the first inlet pipe and the first return pipe located on the same straight pipe section are the inlet and return ports of the cooling water circuit, respectively.

[0021] Furthermore, on the same straight pipe section, the connecting pipe, the first inlet pipe, and the first return pipe are located below the straight pipe section as the inlet of the cooling water circuit, and located above the straight pipe section as the return pipe.

[0022] Furthermore, a corrugated compensator is connected between the connecting pipe and the outer wall of the furnace shell.

[0023] Furthermore, a grouting cavity is formed between the sleeve and baffle of the corrugated compensator and the furnace shell. The grouting cavity is connected to the gap between the hose and the serpentine tube. The sleeve is provided with a grouting hole that communicates with the grouting cavity.

[0024] Furthermore, the furnace shell and cooling wall are respectively provided with a first hole and a second hole distributed corresponding to the position of the connecting pipe. The diameter of the first hole is larger than the outer diameter of the serpentine tube, and the second hole penetrates into the interior of the serpentine tube and has a diameter equal to the inner diameter of the serpentine tube.

[0025] The advantages of this utility model are:

[0026] 1. The serpentine pipe is divided into straight sections and elbow sections. The cooling water circuit is set on the straight sections to avoid the need for a smaller diameter corrugated pipe to pass through the elbow sections. Moreover, the outer diameter of the corrugated pipe in the straight section is the same as the inner diameter of the serpentine pipe, which effectively increases the cross-sectional area of ​​the cooling water circuit. In addition, the inlet and return pipes of each cooling water circuit are set at the connection between the straight and elbow sections, which increases the length of the cooling circuit. The above-mentioned cooling water circuit settings effectively increase the cooling water flow rate in the cooling water circuit, thereby improving the cooling effect of the cooling wall.

[0027] 2. Multiple sets of separate cooling water pipes are used to cool the serpentine pipe. Compared with the existing technology that uses a single continuous and curved corrugated pipe for repair, this can effectively improve the uniformity of cooling, thereby further improving the cooling effect.

[0028] 3. The upper and lower ends of the same straight pipe section are respectively the outlet pipe and the return pipe. The arrangement of low inlet and high outlet can ensure that the air bubbles generated by the cooling water in the corrugated pipe due to heating can be discharged in time, thereby improving the cooling effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present utility model.

[0030] Figure 2 for Figure 1 AA section view

[0031] Figure 3 for Figure 2 Enlarged view of part B in the middle

[0032] in:

[0033] 1-Furnace shell, 101-First hole;

[0034] 2-Cooling wall, 201-Second hole;

[0035] 3-Serpentine pipe, 301-Straight pipe section, 302-Elbow section;

[0036] 4-First inlet pipe, 5-First return pipe, 6-Insulation layer, 7-Connecting pipe, 8-Corrugated pipe;

[0037] 9-Corrugated compensator, 901-Corrugated section, 902-Outer sleeve, 903-Baffle, 904-Grouting hole;

[0038] 10-High thermal conductivity silicon carbide slurry layer. Detailed Implementation

[0039] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0040] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the view direction or positional relationship, and are only for the convenience of describing the utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0041] A blast furnace cooling wall serpentine tube repair device, such as Figures 1-3 As shown, it includes a furnace shell 1, a cooling wall 2, a serpentine pipe 3, a first water inlet pipe 4, a first water return pipe 5, and multiple sets of connecting pipes 7 and corrugated pipes 8. The first water inlet pipe 4 and the first water return pipe 5 are located at the two ends of the serpentine pipe 3, respectively, serving as the water inlet and water return pipes of the original cooling water.

[0042] Specifically, the serpentine pipe 3 consists of four sets of straight pipe sections 301 and three sets of elbow sections 302. A first hole 101 and a second hole 201 are respectively opened on the furnace shell 1 and the cooling wall 2 at the connection between the straight pipe section 301 and the elbow section 302. Furthermore, a set of connecting pipes 7 is provided at the lower end of the straight pipe section 301 where the first water inlet pipe 4 or the first water return pipe 5 is provided. A set of connecting pipes 7 is provided at the upper and lower ends of the other two sets of straight pipe sections 301. A set of corrugated pipes 8 located inside the straight pipe section 301 is connected between the first water inlet pipe 4 and the connecting pipe 7, between the first water return pipe 5 and the connecting pipe 7, and between the two sets of connecting pipes 7 located on the same set of straight pipe sections 301.

[0043] In this embodiment, the outer diameter of the serpentine tube 3 is 40mm, the diameter of the first hole 101 is 55mm, the diameter of the second hole is 40mm, the outer diameter of the corrugated tube 8 is the same as the inner diameter of the serpentine tube 3, the corrugated tube 8 is welded to the connecting pipe 7 or the original first water inlet pipe 4 or the first water return pipe 5, and the connecting pipe 7 is fixedly connected to the furnace shell 1 by the corrugated compensator 9. The gap between the outer wall of the corrugated tube 8 and the inner wall of the serpentine tube 3 is filled with a high thermal conductivity silicon carbide slurry layer 10.

[0044] In this embodiment, the outer sleeve of the corrugated compensator 9 is welded to the outer wall of the furnace shell 1 at one end near the furnace shell 1. A cavity is formed between the outer sleeve 902, the baffle 903, and the first hole 101 on the furnace shell 1. The cavity is connected to the gap between the corrugated pipe 8 and the serpentine pipe 3. A grouting hole 904 is provided on the outer sleeve. High thermal conductivity silicon carbide slurry can be filled into the gap between the corrugated pipe 8 and the serpentine pipe 3 through the grouting hole 904 to improve the thermal conductivity between the corrugated pipe 8 and the serpentine pipe 3.

[0045] In addition, the corrugated pipe 8 in each straight pipe section 301 serves as a separate cooling water circuit. That is, the first inlet pipe 4, connecting pipe 7 or the first return pipe 5 located above the straight pipe section 301 serves as a new inlet pipe and is connected to the outlet of the cooling device. The connecting pipe 7 located at the lower end of the same straight pipe section 301 serves as a new return pipe and is connected to the return outlet of the cooling device, so as to realize four separately distributed cooling water circuits with low inlet and high outlet.

[0046] The specific steps for constructing this device are as follows:

[0047] Step S1, Opening holes in furnace shell 1: Based on the positioning of the serpentine tube 3 inside the cooling wall 2, locate the positions of the multiple straight pipe sections 301 and their elbow sections 302 of the serpentine tube 3, and mark the connection positions of the straight pipe sections 301 and elbow sections 302. Drill a first hole 101 with a diameter larger than the outer diameter of the serpentine tube 3 on the surface of the furnace shell 1 corresponding to the marked position, and clean the refractory material between the furnace shell 1 and the cooling wall 2.

[0048] According to the design drawings of the cooling wall 2, the continuously distributed serpentine pipes 3 are divided into multiple groups of straight pipe sections 301 and elbow sections 302. In this embodiment, there are four straight pipe sections 301 and three elbow sections 302. The original first water inlet pipe 4 and first water return pipe 5 at both ends of the serpentine pipes 3 are located at the upper end. The refractory material between the furnace shell 1 and the cooling wall 2 is a heat insulation layer 6, and the diameter of the first hole 101 opened on the furnace shell 1 is larger than the outer diameter of the straight pipe section 301. After the hole is opened, the furnace shell 1 and the cooling wall 2 are connected. The insulation layer 6 between the furnace shell 1 and the cooling wall 2 is cleaned. In this embodiment, the first hole 101 is 15mm larger than the outer diameter of the serpentine tube 3. The purpose is to facilitate the cleaning of the insulation layer 6 between the furnace shell 1 and the cooling wall 2, and to facilitate positioning when opening the cooling wall 2, as well as to facilitate the pulling of the corrugated tube 8 into the interior of the serpentine tube 3. Compared with the traditional method of opening a hole of 150-200mm in the furnace shell 1, this ensures the strength of the furnace shell 1 and avoids cracking at the position of the first hole 101 due to stress changes in the later stage.

[0049] Step S2, opening a hole in the cooling wall: at the opening position in step S1, a second hole 201 is drilled in the cooling wall 2. The second hole 201 is connected to the interior of the serpentine tube 3, and the diameter of the second hole 201 is equal to the inner diameter of the serpentine tube 3.

[0050] A magnetic drill is used to make a hole in the cooling wall 2. The diameter of the second hole 201 is equal to the inner diameter of the straight pipe section 301. After the hole is made, the inside is cleaned.

[0051] Step S3, welding connecting pipe 7: welding connecting pipe 7 at the first hole 101 position, one end of the connecting pipe 7 is fixedly connected to the furnace shell 1, and the other end extends to the outside of the furnace shell 1;

[0052] A connecting pipe 7 with the same diameter as the straight pipe section 301 is welded to the first hole 101 on the outside of the furnace shell 1, and the connecting pipe 7 is welded and fixed to the outer wall of the furnace shell 1 through a corrugated compensator 9 to absorb the displacement of the cooling wall 2.

[0053] Step S4, Pipe insertion: Insert multiple sets of corrugated pipes 8 into multiple sets of straight pipe sections 301 inside the cooling wall 2. Connect the two ends of the corrugated pipes 8 to two sets of connecting pipes 7 on the same set of straight pipe sections 301, or connect the two ends of the corrugated pipes 8 to the connecting pipes and the original first water inlet pipe 4 or the first water return pipe 5, fix the corrugated pipes 8 to the furnace shell 1, and fill the space between the inner wall of the serpentine pipe 3 and the outer wall of the corrugated pipe 8 with high thermal conductivity silicon carbide slurry.

[0054] In the case where two sets of connecting pipes 7 are provided on the straight pipe section 301, the corrugated pipe 8 is first welded and fixed to one set of connecting pipes 7, then pulled into the straight pipe section 301 by steel wire rope, and finally welded and fixed to the other set of connecting pipes.

[0055] For the straight pipe section 301 equipped with the first inlet pipe 4 and the first return pipe 5, one end of the corrugated pipe 8 is welded to the original first inlet pipe 4 or the first return pipe 5, and then the other end is pulled into the straight pipe section 301 by a steel wire rope and welded to the connecting pipe 7.

[0056] Step S5, Water supply: Cooling water is supplied separately to the interior of multiple sets of corrugated pipes 8, and each set of corrugated pipes 8 is a separate cooling water circuit;

[0057] Each set of corrugated pipes 8 forms a separate low-inlet, high-outlet water supply circuit. That is, the first inlet pipe 4, the first return pipe 5, and the six sets of connecting pipes 7 located on the same set of straight pipe sections 301 are connected to the external cooling device in pairs. The one located at the lower end serves as the inlet pipe and is connected to the outlet of the cooling device, while the one located at the upper end serves as the return pipe and is connected to the return outlet of the cooling device, thus forming four separate cooling circuits.

[0058] The outer diameter of the corrugated pipe 8 is the same as the inner diameter of the straight pipe section 301, and the inlet and return pipes are located at the connection between the straight pipe section 301 and the elbow section 302. This avoids the need to use a smaller diameter corrugated pipe when passing through the elbow section 302, which would reduce the cooling water flow. The above arrangement ensures the cooling water flow in the cooling circuit as much as possible, thereby improving the cooling effect. Moreover, the arrangement of multiple cooling circuits and inlet and return pipes can improve the cooling effect and ensure the uniformity of cooling. In addition, the individual cooling circuit adopts a low-inlet and high-outlet water supply method, which can ensure that the air bubbles generated inside the corrugated pipe 8 due to the heating of the cooling water can be discharged in time, further improving the cooling effect.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A device for repairing water leakage in a serpentine tube of a blast furnace cooling wall, comprising a furnace shell, a cooling wall, and a serpentine tube located within the cooling wall, wherein a first water inlet pipe and a first water return pipe extending outward from the furnace shell are respectively connected to both ends of the serpentine tube, characterized in that, Also includes: Multiple sets of flexible hoses are provided, each set being installed within a straight section of the serpentine tube, and both ends of the flexible hoses are fixedly connected to the furnace shell. The connecting pipe is provided with an even array of pipes, which are located at the connection between the straight and elbow sections of the serpentine pipe and connected to the flexible hose. The connecting pipe, the first inlet pipe and the first return pipe located on the same straight pipe section are the inlet and return ports of the cooling water circuit, respectively.

2. The blast furnace cooling wall serpentine tube leakage repair device according to claim 1, characterized in that, The connecting pipe, the first inlet pipe, and the first return pipe on the same straight pipe section are located below the straight pipe section as the inlet of the cooling water circuit and above the straight pipe section as the return pipe.

3. The blast furnace cooling wall serpentine tube leakage repair device according to claim 1, characterized in that, A corrugated compensator is connected between the connecting pipe and the outer wall of the furnace shell.

4. The blast furnace cooling wall serpentine tube leakage repair device according to claim 3, characterized in that, A grouting cavity is formed between the sleeve and baffle of the corrugated compensator and the furnace shell. The grouting cavity is connected to the gap between the hose and the serpentine tube. A grouting hole connected to the grouting cavity is provided on the sleeve.

5. The blast furnace cooling wall serpentine tube leakage repair device according to claim 1, characterized in that, The furnace shell and cooling wall are respectively provided with a first hole and a second hole corresponding to the position of the connecting pipe. The diameter of the first hole is larger than the outer diameter of the serpentine pipe, and the second hole penetrates into the interior of the serpentine pipe and has a diameter equal to the inner diameter of the serpentine pipe.

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