Submersed nozzle preheating device

Abstract

The utility model discloses a submersed nozzle preheating device which comprises air draft branch pipes, an air collecting pipeline and an exhaust fan, a plurality of air draft branch pipes are connected in parallel, one ends of the air draft branch pipes are connected to one end of the air collecting pipeline at intervals, and the other end of the air collecting pipeline is connected to an air suction opening of the exhaust fan. A preheating device is arranged at the end of the air draft branch pipe, and after the middle tank body is driven into the baking position, the submersed nozzle in the middle tank body sinks into the preheating device; each path of air draft branch pipe is provided with one filtering device; each air draft branch pipe is divided into a front section and a rear section, one end of the front section is connected with the preheating device, one end of the rear section is connected with the air collecting pipeline, and the filtering device is connected between the front section and the rear section of the air draft branch pipe. High-temperature heat generated during preheating of the intermediate tank can be used for preheating the water gap, the interior of the air draft and drainage system can be kept clean, and it is guaranteed that the air draft and drainage efficiency is stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the continuous casting technical field of metallurgical industry, concretely relates to submerged entry nozzle preheating device. BACKGROUND

[0002] Submerged entry nozzle is a refractory sleeve installed at the bottom of a tundish and inserted below the liquid surface of a crystallizer. The principle of the submerged entry nozzle preheating device is to use the heat generated by gas combustion (or use the heat of the high-temperature flame generated during the preheating combustion of the tundish) to gradually raise the temperature of the submerged entry nozzle of the tundish at room temperature to ≥900℃ within 30 minutes, while preheating the upper and lower water nozzles at the bottom of the tundish to prevent the inner walls of the submerged entry nozzle and the upper and lower water nozzles at the bottom of the tundish from forming nodules or even solidifying and blocking during the start of pouring, so as to meet the requirements of the start of pouring and casting of the continuous casting machine.

[0003] The working principle of the air extraction drainage type is to use compressed air drainage (or air extraction drainage) to extract the high-temperature flame and flue gas generated during the preheating of the tundish through the upper and lower water nozzles of the tundish and the submerged entry nozzle from the lower outlet of the submerged entry nozzle. This type of preheating device heats from the inner wall of the water nozzle, preheats the upper and lower water nozzles of the tundish at the same time, and has good use effect.

[0004] However, the preheating device of the air extraction drainage type needs to pay special attention to the problem of harmful waste gas and particulate matter generated by combustion, especially the possibility of refractory material debris, oxides on the surface of the water nozzle, or other impurities entering the air extraction system under the action of the airflow. If these solid impurity particles are not intercepted, they will enter the subsequent air extraction equipment such as the fan, and these impurities will continuously accumulate in the air extraction system, which may cause the air extraction branch pipe to be blocked or change the flow characteristics of the airflow, and even cause wear to the fan blades and other components, seriously affecting the service life of the air extraction equipment. UTILITY MODEL CONTENTS

[0005] In view of the above defects in the prior art, a submerged entry nozzle preheating device is provided, which can not only use the high-temperature heat generated during the preheating of the tundish to preheat the water nozzle, but also maintain the cleanliness of the air extraction drainage system to ensure the stability of the air extraction drainage efficiency.

[0006] The utility model discloses a technical scheme adopted to solve the above technical problems is:

[0007] The submerged entry nozzle preheating device is characterized by:

[0008] The device comprises an air extraction branch pipe, a wind collecting pipe, and an air extractor, a plurality of air extraction branch pipes are connected in parallel, one end of the air extraction branch pipe is connected to one end of the wind collecting pipe, and the other end of the wind collecting pipe is connected to the air inlet of the air extractor; the end of the air extraction branch pipe is provided with a preheating device, and after the intermediate tank body enters the baking position, the submerged entry nozzle in the intermediate tank body is placed in the preheating device;

[0009] The device further comprises a filtering device, and one filtering device is arranged for each air extraction branch pipe; each air extraction branch pipe is divided into a front section and a rear section, one end of the front section is connected to the preheating device, one end of the rear section is connected to the wind collecting pipe, and the filtering device is connected between the front section and the rear section of the air extraction branch pipe.

[0010] According to the above technical scheme, the filtering device is connected to the front section and the rear section of the air extraction branch pipe in a detachable manner; when the impurities in the filtering device reach a set volume, the filtering device is detached and the impurities are cleaned.

[0011] According to the above technical scheme, the filtering device comprises a filtering device body and a top cover, the top cover is fixed to the filtering device body by bolts, and the top cover and the filtering device body form a sealed space.

[0012] According to the above technical scheme, a knuckle bearing is further arranged on the air extraction branch pipe.

[0013] According to the above technical scheme, the knuckle bearing is fixed to the filtering device, and the end of a section of the air extraction branch pipe connected to the preheating device is connected to the filtering device.

[0014] According to the above technical scheme, the length of the front section of the pipeline is set according to the swing range of the preheating device.

[0015] According to the above technical scheme, the preheating device adopts a cup-shaped structure, the top of the preheating device is provided with an opening, and after the submerged entry nozzle is inserted into the opening, a high-temperature-resistant fireproof material is filled in the gap between the preheating device and the submerged entry nozzle.

[0016] According to the above technical scheme, the preheating device is provided in multiple specifications, and the preheating device is detachably connected to the end of the front section of the air extraction branch pipe.

[0017] According to the above technical scheme, the preheating device adopts a cup-shaped structure matched with the largest submerged entry nozzle, and different amounts of high-temperature-resistant materials are filled according to the size of the current corresponding submerged entry nozzle.

[0018] According to the above technical scheme, the preheating device is a shell formed by welding of a high-temperature-resistant and corrosion-resistant material; the air extraction pipe and the wind collecting pipe are made of a high-temperature-resistant and corrosion-resistant material; and the filtering device is a shell formed by welding of a high-temperature-resistant and corrosion-resistant material.

[0019] The device has the following beneficial effects:

[0020] 1. The filter device is additionally arranged on the basis of the existing device, which can ensure that the submerged nozzle can be fully baked, maintain the cleanliness of the internal drainage system, ensure the stability of the drainage efficiency, continuously and effectively remove the waste gas and water vapor generated in the preheating process, and ensure the normal operation of the preheating device.

[0021] 2. The filter device is connected to the front section and the rear section of the drainage branch pipe in a detachable manner; when the impurities in the filter device reach the set volume, the impurities in the filter device can be easily cleaned. Alternatively, the filter device comprises a filter device body and a top cover, the top cover is fixed on the filter device body by bolts, the top cover and the filter device body form a closed space, and the impurities in the filter device can be easily cleaned by detaching the top cover.

[0022] 3. A knuckle bearing is additionally arranged on the drainage branch pipe, which can ensure that the preheating device can freely and flexibly swing, and meet the docking with the submerged nozzle when the intermediate tank car is parked at different positions.

[0023] 4. The preheating device is provided in different specifications, or different amounts of high-temperature-resistant materials are filled in the large-size preheating device, so as to meet the docking with submerged nozzles of different sizes.

[0024] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and the content of the specification can be implemented, the following will be described in detail with the preferred embodiments of the present application and the accompanying drawings. The specific implementation of the present application is given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application, the schematic embodiments of the present application and the description are used to explain the present application, and do not constitute an improper limitation on the present application.

[0026] Fig. 1 is the plane arrangement schematic diagram of the submerged nozzle preheating device provided by the embodiment of the present application;

[0027] Fig. 2 is the elevation arrangement schematic diagram of the submerged nozzle preheating device provided by the embodiment of the present application;

[0028] Fig. 3 is the detailed arrangement schematic diagram of the filter device and the preheating device of the submerged nozzle preheating device provided by the embodiment of the present application;

[0029] In the diagram, 1. Exhaust branch pipe; 1-1. Front section; 1-2. Rear section; 2. Collector duct; 3. Exhaust fan; 4. Preheating device; 5. Baking position; 6. Intermediate tank; 7. Immersion water inlet; 8. Filter device; 9. Spherical bearing; 10. Flange. Detailed Implementation

[0030] The following is in conjunction with the appendix Figs. 1-3 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0031] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Reference Figs. 1-3 As shown, this utility model provides an immersion-type water inlet preheating device.

[0034] Example 1

[0035] It includes an exhaust branch pipe 1, a collection pipe 2, and an exhaust fan 3. Several exhaust branch pipes are connected in parallel, and one end of the exhaust branch pipe is connected to one end of the collection pipe at intervals. The other end of the collection pipe is connected to the air inlet of the exhaust fan. A preheating device 4 is provided at the end of the exhaust branch pipe. After the intermediate tank enters the baking position 5, the immersion water inlet 7 in the intermediate tank 6 is submerged in the preheating device.

[0036] The filtering device 8 is also included, and one filtering device is arranged in each air extraction branch pipe; each air extraction branch pipe is divided into a front section 1-1 and a rear section 1-2, one end of the front section is connected with the preheating device, and one end of the rear section is connected with the air collecting pipeline, and the filtering device is connected between the front section and the rear section of the air extraction branch pipe.

[0037] The filtering device is additionally arranged on the basis of the existing device, which can ensure that the submerged nozzle can be fully baked and keep the inside of the air extraction and drainage system clean, ensure the efficiency of the air extraction and drainage, continuously and effectively extract the waste gas and water vapor generated in the preheating process, and ensure the normal operation of the preheating device.

[0038] Embodiment 2

[0039] The structure and principle of Embodiment 2 are similar to those of Embodiment 1, and the difference lies in that: in order to facilitate the cleaning of impurities in the filtering device, the filtering device is connected with the front section and the rear section of the air extraction branch pipe in a detachable manner; when the impurities in the filtering device reach a set volume, the filtering device is detached and the impurities are cleaned.

[0040] Embodiment 3

[0041] The structure and principle of Embodiment 3 are similar to those of Embodiment 1, and the difference lies in that: in order to facilitate the cleaning of impurities in the filtering device, the filtering device includes a filtering device body and a top cover, the top cover is fixed on the filtering device body by bolts, and the top cover and the filtering device body form a closed space. The filtering device adopts the existing structure, such as arranging a metal filter screen in the box, placing adsorbent material, or changing the shape of the air duct to achieve the purpose of filtering.

[0042] Embodiment 4

[0043] The structure and principle of Embodiment 4 are similar to those of any one of Embodiments 1-3, and the difference lies in that: when the intermediate tank body enters the baking position from the casting position, due to the difference in parking position, the position of the submerged nozzle is different each time it enters the baking position; in order to ensure that the submerged nozzle can be inserted into the preheating device each time, a knuckle bearing 9 is also arranged on the air extraction branch pipe, which ensures that the preheating device can freely and flexibly swing.

[0044] Preferably, the knuckle bearing is fixed on the filtering device, and the end of a section of pipeline of the air extraction branch pipe connected with the preheating device is connected to the filtering device.

[0045] In order to avoid the deposition of impurities in the front section of the air extraction branch pipe, it is necessary to reduce the length of the front section pipeline as much as possible; according to the swing range of the preheating device, the length of the front section pipeline is set.

[0046] In the embodiments 1-4, the preheating device adopts a cup-shaped structure, the top of the preheating device is provided with an opening, and the water nozzle is inserted into the opening and then the gap between the preheating device and the water nozzle is filled with high-temperature-resistant fireproof material. When the preheating work of the submerged water nozzle is carried out, the high-temperature-resistant material is located in the gap between the preheating device and the submerged water nozzle, which plays a certain sealing role and ensures the normal operation of the air extractor.

[0047] Preferably, in order to cope with submerged water nozzles of different size specifications, a preferred structure of the preheating device is given; the preheating device is provided with multiple specifications, and the preheating device is detachably connected to the front end of the air extraction branch pipe.

[0048] Preferably, in order to cope with submerged water nozzles of different size specifications, another preferred structure of the preheating device is given; the preheating device adopts a cup-shaped structure matched with the largest submerged water nozzle, and different amounts of high-temperature-resistant material are filled according to the size of the current corresponding submerged water nozzle.

[0049] In the above embodiments, the preheating device is a shell formed by welding high-temperature-resistant and corrosion-resistant materials; the air extraction pipe and the air collection pipe are both made of high-temperature-resistant and corrosion-resistant materials; and the filtering device is a shell formed by welding high-temperature-resistant and corrosion-resistant materials.

[0050] In the above embodiments, in order to facilitate the replacement of the air extraction branch pipe on the air collection pipeline, the air extraction branch pipe and the air collection pipeline are connected through a flange 10.

[0051] The working principle of the utility model is as follows:

[0052] The air extractor is powered on and works, and the submerged water nozzle is subjected to air extraction through the air collection pipeline, the filtering device, the joint bearing, the air extraction branch pipe and the preheating device, so as to form a negative pressure area.

[0053] Under the action of negative pressure, the high-temperature heat in the intermediate tank car will flow along the submerged water nozzle into the preheating device, thereby completing the baking and preheating of the submerged water nozzle.

[0054] Harmful exhaust gas and particulate matter generated by combustion, such as debris of refractory material, oxides on the surface of the water nozzle or other impurities, will enter the preheating device and be intercepted in the filtering device through the air extraction branch pipe, thereby reducing the risk of particulate matter entering the air extractor and improving the stability of the equipment.

[0055] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form; any person skilled in the art can smoothly implement the present application according to the drawings shown in the specification and the above description; however, any person skilled in the art can make slight changes, modifications and equivalent changes of the present application within the scope of the technical scheme of the present application, and the equivalent embodiments of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A submerged nozzle preheating device, characterized in that: it comprises an air extraction branch pipe, a wind collecting pipeline, and an air extraction fan, a plurality of air extraction branch pipes are connected in parallel, and one end of the air extraction branch pipe is connected to one end of the wind collecting pipeline at intervals, and the other end of the wind collecting pipeline is connected to the air inlet of the air extraction fan; the end of the air extraction branch pipe is provided with a preheating device, and after the intermediate tank body enters the baking position, the submerged nozzle in the intermediate tank body sinks and is placed in the preheating device; it further comprises a filtering device, and each air extraction branch pipe is provided with one filtering device; each air extraction branch pipe is divided into a front section and a rear section, one end of the front section is connected to the preheating device, one end of the rear section is connected to the wind collecting pipeline, and the filtering device is connected between the front section and the rear section of the air extraction branch pipe.

2. The shroud preheating apparatus of claim 1, wherein: The filtering device is connected to the front section and the rear section of the air extraction branch pipe in a detachable manner; when the impurities in the filtering device reach a set volume, the filtering device is detached and the impurities are cleaned.

3. The shroud preheating apparatus of claim 1, wherein: The filtering device comprises a filtering device body and a top cover, the top cover is fixed on the filtering device body by bolts, and the top cover and the filtering device body form a closed space.

4. The shroud preheating apparatus of claim 1, wherein: A knuckle bearing is further arranged on the air extraction branch pipe.

5. The shroud preheating apparatus of claim 4, wherein: The knuckle bearing is fixed on the filtering device, and the end of a section of pipeline of the air extraction branch pipe connected to the preheating device is connected to the filtering device.

6. The shroud preheating apparatus of claim 4, wherein: The length of the front section pipeline is set according to the swing range of the preheating device.

7. The shroud preheating apparatus of claim 1, wherein: The preheating device adopts a cup-shaped structure, the top of the preheating device is provided with an opening, and after the nozzle is inserted into the opening, a high-temperature-resistant fireproof material is filled in the gap between the preheating device and the nozzle.

8. The shroud preheating apparatus of claim 7, wherein: The preheating device is provided in multiple specifications, and the preheating device is detachably connected to the end of the front section of the air extraction branch pipe.

9. The shroud preheating apparatus of claim 7, wherein: The preheating device adopts a cup-shaped structure matched with the largest submerged nozzle, and different amounts of high-temperature-resistant materials are filled according to the size of the current corresponding submerged nozzle.

10. The shroud preheating apparatus of claim 1, wherein: The preheating device is a shell welded from high-temperature-resistant and corrosion-resistant materials; the air extraction pipe and the wind collecting pipe are made of high-temperature-resistant and corrosion-resistant materials; and the filtering device is a shell welded from high-temperature-resistant and corrosion-resistant materials.

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