RH off-line baking device

Abstract

The utility model relates to an RH off-line baking device, and belongs to the technical field of RH vacuum refining devices. Comprising an RH vacuum tank, a blowing gun at the top of the RH vacuum tank and a moving trolley at the bottom of the RH vacuum tank, the gas collection tank is connected with a waste gas exhaust pipeline through a movable expansion joint; the movable trolley drives the gas collection tank and the cold steel slag disc to move between the treatment position and the hoisting position; when the vacuum tank is used for baking, the movable trolley transports the gas collecting box to a treatment position; when the vacuum tank melts cold steel, the movable trolley transports a cold steel slag disc to a treatment position; when the cold steel slag disc is replaced, the movable trolley transports the cold steel slag disc to a hoisting position. And oxygen and fuel gas are introduced into the blowing gun to carry out baking or cold steel melting treatment on the vacuum tank. According to the RH off-line baking station, system improvement and function improvement are carried out on an existing RH off-line baking station, occupation of an on-line top gun or a baking gun in RH cold steel melting operation is eliminated, the operation rate is improved, and the operation environment is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to RH vacuum refining device technical field relates to a kind of RH off-line baking device. BACKGROUND

[0002] As important equipment in the steel smelting process, the running state of RH vacuum tank directly affects the quality of liquid steel and production efficiency. However, in the long-term use process, the inner wall of RH vacuum tank will inevitably bond with cold steel. The formation of these cold steels is mainly due to the splashing of liquid steel during vacuum treatment caused by intense reaction or alloy feeding. The existence of cold steel not only leads to nitrogen increase in liquid steel, affecting the quality of steel, but also causes additional burden to the refractory of vacuum tank, shortening its service life.

[0003] To deal with this problem, steel enterprises usually use the way of blowing oxygen with top gun to remove cold steel in the vacuum tank. During the processing gap, the top gun cooperates with high-calorific-value gas to melt and remove the cold steel bonded to the inner wall of the tank through high-temperature oxidation. This process is crucial to maintaining the good state of the vacuum tank. Similarly, before the maintenance of the vacuum tank refractory, cold steel treatment must also be carried out to avoid more extensive damage to the refractory due to the attachment of cold steel when the vacuum tank is disassembled or the refractory is repaired, thereby increasing the maintenance cost and time.

[0004] The length of the cold steel removal operation depends on the degree of cold steel bonding. If the cold steel bonding is light, the processing time may only take about half an hour; but if the bonding is severe, the processing time may last for several hours. For RH arrangement forms with two cars and three or five positions, the baking gun of the standby position can be used for cold steel removal, so that the operation time of the top gun of the processing position is not occupied, improving the utilization rate of the equipment.

[0005] However, there are some problems in melting cold steel at the standby position. Since the cold steel slag pan is usually set on the ground, far from the vacuum tank immersion pipe, the melted cold steel is easy to scatter and splash, and cannot be completely collected by the cold steel slag pan. This not only causes waste of resources, but also may bring burning risk to the operator, affecting the operation safety.

[0006] For single-car single-position, two-car three-position or two-car four-position RH arrangement types, due to the limitation of equipment configuration, only online top gun can be used for cold steel removal. In this case, the top gun will be occupied for a long time, seriously affecting the overall operation rate of RH. Especially in the current background of steel enterprises transforming from ordinary steel to high-quality steel products, the new RH vacuum refining device becomes a key measure to improve product competitiveness. However, under the premise that the original plant does not reserve space for RH vacuum refining device, similar three-car five-position vacuum refining device arrangement cannot be implemented.

[0007] Therefore, the on-line top lance will inevitably affect the production rhythm and reduce the production efficiency when the vacuum ladle is used for the cold steel. In order to solve this technical problem, a new vacuum ladle cold steel method is needed to meet the needs of the transformation and upgrading of the steel enterprises. Content of the utility model

[0008] Therefore, the on-line top lance will inevitably affect the production rhythm and reduce the production efficiency when the vacuum ladle is used for the cold steel. In order to solve this technical problem, a new vacuum ladle cold steel method is needed to meet the needs of the transformation and upgrading of the steel enterprises.

[0009] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0010] A RH offline baking device, comprising a RH vacuum ladle, wherein the top of the vacuum ladle is provided with a blowing gun, and the bottom of the vacuum ladle is provided with a movable trolley, the movable trolley carries a gas collecting box and a cold steel slag tray, the gas collecting box is connected with a waste gas discharge pipeline through a movable telescopic joint, and the movable trolley drives the gas collecting box and the cold steel slag tray to move between a processing position and a lifting position.

[0011] When the vacuum ladle is baked, the movable trolley transports the gas collecting box to the processing position, the telescopic joint is connected with the gas collecting box to meet the exhaust requirement, when the gas collecting box leaves the processing position, the telescopic joint is retracted and disconnected with the gas collecting box to meet the movement requirement of the gas collecting box, when the vacuum ladle is used for cold steel, the movable trolley transports the cold steel slag tray to the processing position, and when the cold steel slag tray is replaced, the movable trolley transports the cold steel slag tray to the lifting position.

[0012] Optionally, oxygen and fuel gas are introduced into the blowing gun to bake the vacuum ladle or treat the cold steel.

[0013] Optionally, the cold steel slag tray is a flat bottom cast iron tray.

[0014] Optionally, the movable trolley is provided with a frequency speed regulator for speed regulation.

[0015] Optionally, the movable trolley is provided with a laser range finder.

[0016] Optionally, the lifting position is provided with a crane for lifting and replacing the cold steel slag tray.

[0017] Optionally, the movable trolley comprises movable wheels arranged at the bottom of the movable trolley.

[0018] The utility model has the advantages of:

[0019] The utility model discloses the function of the cold steel is added to the baking gun of the existing RH vacuum tank offline baking station, and is equipped with the cold steel slag tray of trolley bearing, so that the RH offline baking station has the function of cold steel, and the RH cold steel does not have to be handled on line, and the long time occupation of the cold steel to the on-line top gun is released, and the effective operation time of RH is improved.

[0020] In order to meet the switching of the baking and cold steel functions of the offline vacuum tank baking station, a movable trolley is arranged to carry a gas collecting box and a cold steel slag tray.When the vacuum tank needs to be baked, the trolley transports the gas collecting box to a processing station to collect and discharge baking waste gas, and the waste gas is used to bake the immersion pipe, and at this time, the telescopic joint is connected with the gas collecting box to meet the exhaust requirement; when the gas collecting box leaves the processing station (that is, when the cold steel is melted or the cold steel slag tray is replaced), the telescopic joint is retracted and disconnected with the gas collecting box to meet the movement requirement of the gas collecting box; when the vacuum tank needs to melt the cold steel, the trolley transports the cold steel slag tray to the processing station; when the cold steel slag tray is full and needs to be replaced, the trolley transports the cold steel slag tray to a crane hoisting station. The utility model improves the system and function of the existing RH offline baking station, releases the occupation of the RH cold steel operation to the on-line top gun or baking gun, improves the operation rate of RH, and improves the operation environment of RH.

[0021] Other advantages, objects and features of the present utility model will be explained in the following description to some extent, and will be obvious to those skilled in the art based on the study of the following description or can be taught from the practice of the present utility model. The objects and other advantages of the present utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the objects, technical schemes and advantages of the present utility model more clear, the preferred detailed description of the present utility model will be described below in combination with the drawings, in which:

[0023] Fig. 1 It is the front view of the device of the utility model;

[0024] Fig. 2 It is the side view of the device of the utility model.

[0025] Reference signs:

[0026] 1 blow gun, 2 vacuum tank, 3 gas collecting box, 4 cold steel slag tray, 5 movable trolley, 6 telescopic joint, 7 waste gas discharge pipeline. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below with specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only schematically illustrate the basic concept of the present application, and the following examples and features in the examples can be combined with each other without conflict.

[0028] In the drawings, only the schematic representation is shown, and the actual physical drawing cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings can be omitted, enlarged or reduced, and do not represent the actual product size; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings can be omitted.

[0029] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the positional relationship described in the drawings is only used for illustrative purposes, and cannot be understood as a limitation of the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Please refer to Figs. 1-2 It is an RH offline baking device, including RH vacuum tank 2, vacuum tank 2 top is equipped with blowing gun 1, bottom is equipped with mobile trolley 5, mobile trolley 5 carries gas collecting box 3 and cold steel slag tray 4 on; gas collecting box 3 is connected with exhaust gas pipeline 7 through movable expansion joint 6; mobile trolley 5 drives gas collecting box 3, cold steel slag tray 4 moves between treatment position, hoisting position, ensures that the exhaust gas is smoothly discharged during baking and facilitates the position switching of gas collecting box 3 and cold steel slag tray 4.

[0031] The cold steel slag tray 4 is preferably a flat bottom cast iron tray. The mobile trolley 5 is provided with a frequency converter for speed regulation and a laser range finder for accurate positioning, to ensure accurate positioning when switching the positions of the gas collecting box 3 and the cold steel slag tray 4.

[0032] The mobile trolley 5 comprises a plurality of mobile wheels arranged at the bottom thereof.

[0033] In some embodiments of this invention, the vacuum chamber 2 is used for baking, and oxygen and fuel gas are introduced into the blowtorch 1 to bake the vacuum chamber 2. The blowtorch 1 is designed to have a maximum oxygen flow rate of 1000 Nm³. 3 / h, used for full oxygen or oxygen-enriched combustion during baking. The mobile trolley 5 moves the gas collection box 3 to the processing position to insulate the vacuum tank impregnation tube, collect gas, and exhaust gas. The expansion joint 6 of the exhaust gas pipe 7 extends and connects to the gas collection box 3 to discharge baking exhaust gas. When baking is over and the gas collection box 3 needs to leave the processing position, the expansion joint 6 retracts and disengages from the gas collection box 3 to facilitate the movement of the trolley and meet the movement requirements of the gas collection box 3.

[0034] In some other embodiments of this utility model, when the vacuum tank 2 is used for melting and cooling steel, gas and oxygen are simultaneously introduced into the blow gun 1 to treat the vacuum tank 2 for melting and cooling steel. The mobile trolley 5 moves the cold steel slag tray 4 to the processing position to receive the cold steel melted in the vacuum tank 2 and prevent the cold steel from flowing disorderly on the ground of the baking station.

[0035] When the vacuum tank 2 is used for baking or cooling steel treatment, the gas introduced into the blow gun 1 is all high-calorific-value coal gas, such as coke oven gas or natural gas.

[0036] In some other embodiments of this utility model, the cold steel slag pan 4 needs to be replaced. The mobile trolley 5 moves the cold steel slag pan 4 to the hoisting position, where a crane is provided to facilitate the hoisting and replacement of the cold steel slag pan 4.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An RH offline baking device, characterized in that: The system includes an RH vacuum tank (2), which has a blow gun (1) at the top and a mobile trolley (5) at the bottom. The mobile trolley (5) carries a gas collection box (3) and a cold steel slag tray (4). The gas collection box (3) is connected to a waste gas exhaust pipe (7) via a movable telescopic joint (6). The mobile trolley (5) moves the gas collection box (3) and the cold steel slag tray (4) between the processing position and the hoisting position. When the vacuum tank (2) is being baked, the mobile trolley (5) transports the gas collection box (3) to the processing position, and the telescopic joint (6) is connected to the gas collection box (3) to meet the exhaust requirements; when the gas collection box (3) leaves the processing position, the telescopic joint (6) retracts and disconnects from the gas collection box (3) to meet the movement requirements of the gas collection box (3); when the vacuum tank (2) is melting cold steel, the mobile trolley (5) transports the cold steel slag tray (4) to the processing position; when the cold steel slag tray (4) is replaced, the mobile trolley (5) transports the cold steel slag tray (4) to the hoisting position.

2. The RH offline baking apparatus according to claim 1, characterized in that: Oxygen and gas are introduced into the blow gun (1) to bake or melt-cool the vacuum tank (2).

3. The RH offline baking apparatus according to claim 1, characterized in that: The cold steel slag pan (4) is a flat-bottomed cast iron pan.

4. The RH offline baking apparatus according to claim 1, characterized in that: The mobile trolley (5) is equipped with a frequency converter for speed adjustment.

5. The RH offline baking apparatus according to claim 1, characterized in that: The mobile trolley (5) is equipped with a laser rangefinder.

6. The RH offline baking apparatus according to claim 1, characterized in that: The hoisting position is equipped with a crane for hoisting and replacing the cold steel slag pan (4).

7. The RH offline baking apparatus according to claim 1, characterized in that: The mobile trolley (5) includes wheels located at its bottom.

Images