Cooling device for converter flue oxygen lance opening

Abstract

The utility model discloses a cooling device for a converter flue oxygen lance opening, which belongs to the technical field of converter equipment and comprises a shell, a plurality of water inlet runners and a plurality of water outlet runners. A water inlet header and a water outlet header are annularly arranged on the periphery of the shell, and a communicating box is annularly arranged at the inclined opening end of the shell. The multiple water inlet flow channels are arranged in the circumferential direction of the shell and located in the side, close to the inner wall, of the shell. The multiple water outlet flow channels are arranged in the circumferential direction of the shell and located in the side, close to the outer wall, of the shell. As the water inlet runner, the water outlet runner and the shell are formed by integral casting, the oxygen lance opening has few structural weak parts, and the oxygen lance opening is strong in integral structure and is not easily damaged by external impact. The water inlet runner and the water outlet runner are separated in the inner wall and the outer wall of the shell respectively, so that the overall cooling uniformity of the oxygen lance opening is high, a heat concentration area is avoided, the structure of the oxygen lance opening is effectively protected, the service life of the oxygen lance opening is remarkably prolonged, and the maintenance rate is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of converters, in particular to a cooling device for an oxygen gun mouth of a converter flue. Background Art

[0002] Converter steelmaking is a process that uses a converter for high-temperature smelting. The basic principle is to put pig iron or scrap steel and steelmaking agents into a converter at high temperature, blow oxygen and other oxidants into the converter through an oxygen lance to carry out redox reactions, so that the carbon content and other impurities can be controlled, and finally obtain molten steel that meets the requirements. An oxygen lance is set on the side wall of the converter flue above the metallurgical furnace, and the oxygen lance protects the oxygen lance through its own cooling function.

[0003] Since the oxygen lance is close to the converter mouth, the inner wall of the oxygen lance will be impacted by high-temperature flue gas, slag liquid splashes and condensed steel slag attached to the oxygen lance during use, and the working conditions are very harsh. Under the influence of these multiple factors, the oxygen lance is prone to deformation, damage and even leakage.

[0004] At present, there are two main cooling structures used in oxygen lances. One is to evenly distribute multiple seamless steel pipes along the circumferential direction of the oxygen lance, and multiple pipes are clamped between two shells. The gaps between the pipes are reinforced with flat steel or round steel to form a cylindrical structure surrounded by pipes. The manufacturing process of this structure is relatively simple, but due to the thickness of the seamless steel pipe itself, the wall thickness of the oxygen lance shell cannot be too large considering the problem of heat transfer efficiency, but this will also cause the thin-walled part to easily leak under external impact. The other is to cast multiple cooling pipelines as a whole inside the oxygen lance shell. In order to avoid the cooling water in the flue cooling pipe, the external pipeline needs to take away the heat from top to bottom and then turn and discharge from bottom to top. The oxygen lance structure of this structure has fewer weak points, but the cooling uniformity of the oxygen lance shell is low, and a high-temperature concentration area is easily formed on the surface, which is also easy to cause structural damage. Utility Model Content

[0005] The utility model aims to provide a cooling device for the oxygen lance mouth of a converter flue to solve the problems raised in the prior art.

[0006] A cooling device for a converter flue oxygen lance is provided, comprising:

[0007] A shell, one end of which is a flat opening and the other end is an inclined opening connected to the flue, a water inlet manifold and a water outlet manifold are arranged around the periphery of the shell, and a connecting box is arranged around the inclined opening end of the shell;

[0008] A plurality of water inlet channels, wherein the plurality of water inlet channels are arranged along the circumference of the shell and are located inside one side of the shell close to the inner wall, and after being connected with the water inlet manifold, the water inlet channels extend from the inside of the flat end of the shell to the inside of the inclined end and are connected with the connecting box;

[0009] A plurality of water outlet channels are arranged along the circumference of the shell and located inside one side of the shell close to the outer wall. After being connected with the water outlet manifold, the water outlet channels extend from the inside of the flat end of the shell to the inside of the inclined end and are connected with the connecting box.

[0010] Furthermore, the plurality of water inlet channels and the plurality of water outlet channels are arranged in an interval arrangement in the circumferential direction of the shell.

[0011] Furthermore, the height of the water inlet header on the radial horizontal plane of the shell is greater than the height of the water outlet header on the radial horizontal plane of the shell.

[0012] Furthermore, a plurality of the water inlet channels extend toward the interior of the shell so that the inner wall of the shell forms a continuous wave-shaped structure.

[0013] Furthermore, a scale-inhibiting coating layer or a non-metallic heat exchange surface layer is provided on the inner wall of the connecting box.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The oxygen lance is cooled by a number of coolant flow pipes arranged circumferentially inside the shell. Since the water inlet and outlet channels are integrally cast with the shell, the oxygen lance has fewer structural weaknesses, a strong overall structure, and is not easily damaged by external impact. The water inlet and outlet channels are separated in the inner and outer walls of the shell, respectively, so that the overall cooling uniformity of the oxygen lance is high, and there will be no heat concentration area, which effectively protects the structure of the oxygen lance, significantly increases the service life of the oxygen lance, and reduces the maintenance rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 The overall structural schematic diagram of a cooling device for a converter flue oxygen lance is shown;

[0018] Figure 2 It is a cross-sectional schematic diagram of a cooling device for the oxygen lance mouth of a converter flue.

[0019] In the figure: 1. Shell; 2. Water inlet manifold; 3. Water outlet manifold; 4. Connecting box; 5. Water inlet flow channel; 6. Water outlet flow channel. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-2 As shown, in an embodiment of the utility model, a cooling device for the oxygen gun mouth of a converter flue comprises a shell 1, a plurality of water inlet channels 5 and a plurality of water outlet channels 6. One end of the shell 1 is a flat mouth and the other end is an inclined mouth connected to the flue. The outer periphery of the shell 1 is ringed with a water inlet manifold 2 and a water outlet manifold 3, and the inclined mouth end of the shell 1 is ringed with a connecting box 4. A plurality of water inlet channels 5 are arranged along the circumference of the shell 1 and are located inside one side of the shell 1 close to the inner wall. After the water inlet channels 5 are connected with the water inlet manifold 2, they extend from the inside of the flat end of the shell 1 to the inside of the inclined mouth end and are connected to the connecting box 4. A plurality of water outlet channels 6 are arranged along the circumference of the shell 1 and are located inside one side of the shell 1 close to the outer wall. After the water outlet channels 6 are connected with the water outlet manifold 3, they extend from the inside of the flat end of the shell 1 to the inside of the inclined mouth end and are connected to the connecting box 4.

[0023] When the oxygen gun nozzle is cooled, firstly, the coolant is introduced into the water inlet header 2 through the water inlet pipe. The water inlet header 2 is respectively connected with a plurality of water inlet channels 5. After the coolant in the water inlet header 2 is replenished to a certain amount, it enters from each water inlet channel 5 and takes away the heat on the shell 1. When the coolant flows to the inclined port at the bottom of the shell 1, it will converge into the connecting box 4. Since the inclined port is located inside the flue after installation, the oxygen gun nozzle is subjected to the highest heat here, so the annular continuous connecting box 4 can greatly improve the heat dissipation efficiency here.

[0024] Since the oxygen gun nozzle is an overall conical structure, the lengths of the water inlet channels 5 are different, resulting in different amounts of absorbed heat, so the temperature of the coolant flowing out of each water inlet channel 5 is different. The connecting box 4 gathers and mixes the coolant from each water inlet channel 5, which can balance the overall temperature of the coolant in the connecting box 4 to a certain extent, avoiding the appearance of a heat concentration area at the inclined mouth end. The coolant after temperature balance further enters each water outlet channel 6, and the return coolant is input into the water outlet manifold 3 through the water outlet channel 6. The water outlet manifold 3 gathers the coolant and discharges it through the water outlet pipe.

[0025] A plurality of water inlet channels 5 and a plurality of water outlet channels 6 are arranged in an interval arrangement in the circumferential direction of the shell 1. On the one hand, this structural arrangement can make full use of the internal space of the shell 1, and in addition to reducing the overall wall thickness of the shell 1, it also avoids the problem of low heat transfer efficiency caused by excessive wall thickness of part of the shell 1. On the other hand, the water outlet channels 6 can also allow the coolant to continue to fully absorb the heat on the shell 1, and perform heat exchange with the connecting wall between two adjacent water inlet channels 5, so that the heat absorbed by the coolant reaches saturation, improve the utilization rate of the coolant, and further improve the uniformity of cooling.

[0026] After the oxygen lance is installed on the flue, the whole is arranged vertically relative to the horizontal plane. The height of the water inlet manifold 2 is set higher than that of the water outlet manifold 3, and the height difference between the two can be used to provide a certain pressure difference for the coolant, which is conducive to the flow of the coolant in the water inlet flow channel 5, the connecting box 4 and the water outlet flow channel 6, thereby improving the fluidity of the coolant.

[0027] See also Figure 2 As shown, the cross-section of the water inlet channel 5 can be set to a standard circle or an arc shape with different curvatures on both sides. Several water inlet channels 5 extend into the interior of the shell 1 so that the inner wall of the shell 1 forms a continuous wave-shaped structure. This structure can increase the contact area between the inner wall of the shell 1 and the surrounding heat, reduce the wall thickness of the connecting wall between two adjacent water inlet channels 5, and thus improve the heat exchange efficiency between the water inlet channel 5 and the surrounding environment. In addition, since the wall thickness of the connecting wall between two adjacent water inlet channels 5 is reduced, the heat exchange efficiency between the water outlet channel 6 and the inside of the shell 1 is also improved, so that the shell 1 can adjust the internal thermal uniformity through the water outlet channel 6.

[0028] Since the oxygen gun nozzle is a conical structure and the inclined mouth has a conical tip, the coolant fluidity in the connecting box 4 is not strong, which easily leads to scale accumulation. If scale accumulates inside the connecting box 4, it will affect the heat exchange efficiency of the connecting box 4, and then cause water leakage in the connecting box 4. Therefore, coating the inner wall of the connecting box 4 with anti-scale coating or setting a non-metallic heat exchange surface can effectively prevent scale accumulation. The anti-scale coating can prevent or reduce scale adhesion through special chemical components. The non-metallic heat exchange surface uses non-metallic materials as heat exchange layers attached to the inner wall of the connecting box 4, such as polytetrafluoroethylene materials or ceramic materials, which can effectively prevent scale accumulation.

[0029] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A cooling device for a converter flue oxygen lance, characterized in that: include: A shell (1), one end of the shell (1) is a flat opening and the other end is an inclined opening connected to a flue, a water inlet manifold (2) and a water outlet manifold (3) are arranged around the outer periphery of the shell (1), and a connecting box (4) is arranged around the inclined opening end of the shell (1); A plurality of water inlet channels (5), the plurality of water inlet channels (5) being arranged along the circumference of the shell (1) and being located inside one side of the shell (1) close to the inner wall, the water inlet channels (5) being connected to the water inlet manifold (2), extending from the inside of the flat end of the shell (1) to the inside of the inclined end and being connected to the connecting box (4); A plurality of water outlet channels (6) are arranged along the circumference of the shell (1) and are located inside one side of the shell (1) close to the outer wall. After being connected to the water outlet manifold (3), the water outlet channels (6) extend from the inside of the flat end of the shell (1) to the inside of the inclined end and are connected to the connecting box (4).

2. The cooling device for the oxygen lance of a converter flue according to claim 1, characterized in that: The plurality of water inlet channels (5) and the plurality of water outlet channels (6) are arranged in an intermittent manner in the circumferential direction of the shell (1).

3. The cooling device for the oxygen lance of a converter flue according to claim 1, characterized in that: The height of the water inlet header (2) on the radial horizontal plane of the shell (1) is greater than the height of the water outlet header (3) on the radial horizontal plane of the shell (1).

4. The cooling device for the oxygen lance of a converter flue according to claim 1, characterized in that: The plurality of water inlet channels (5) extend toward the interior of the shell (1) so that the inner wall of the shell (1) forms a continuous wave-shaped structure.

5. The cooling device for converter flue oxygen lance according to claim 1, characterized in that: The inner wall of the connecting box (4) is provided with a scale-inhibiting coating layer or a non-metallic heat exchange surface layer.

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