A special oxygen lance device for blast furnace blow-in

Abstract

This utility model discloses a special oxygen lance device for blast furnace start-up. The lance body consists of an oxygen pipe and a cooling air pipe. The end away from the lance head is closed. The cooling air pipe is sleeved on the outside of the oxygen pipe, leaving an air flow channel between them. Inclined air inlets are symmetrically arranged on the left and right sides of the cooling air pipe. The other end of the air inlets is connected to a gas source through a pipeline. Inclined oxygen inlets are symmetrically connected on the left and right sides of the oxygen pipe. One end of the oxygen inlet passes through the cooling air pipe and is connected to the oxygen pipe at its top. The other end is connected to an oxygen storage tank through a pipeline. A thermocouple tube is connected to the end of the oxygen pipe near the lance head. This device solves the problem of severe heat deficiency in the hearth during the initial start-up and restart of blast furnaces that have been shut down. It enables rapid heating inside the hearth, ensuring sufficient temperature for the first batch of slag and iron, and smooth removal of slag and iron from the furnace. This greatly reduces the labor intensity in front of the furnace and provides a strong guarantee for the safe, rapid, and efficient production of the blast furnace.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace equipment technology, specifically to a special oxygen lance device for blast furnace start-up. Background Technology

[0002] In the initial stages of commissioning a new blast furnace and restarting a blast furnace that has been shut down, the severe lack of heat in the hearth becomes a key constraint on the recovery of blast. Oxygen lance technology, through localized heating in the taphole area, effectively solves the problem of insufficient heat in the hearth during the initial blast, ensuring the smooth discharge of the first batch of molten iron and the separation of slag and iron. This significantly reduces the labor intensity in front of the furnace, accelerates the furnace condition recovery process, and helps the blast furnace reach production quickly and efficiently, creating significant economic benefits for the enterprise. In the traditional furnace start-up process, after blast is supplied, it is necessary to wait for coke and lightly loaded materials to arrive in the hearth for heating, generating sufficient slag and iron, and then gradually increasing the blast. This process is particularly lengthy for blast furnaces that have been shut down and restarted, severely delaying the start-up progress and leading to the stagnation of the entire production process and economic losses. Utility Model Content

[0003] The purpose of this utility model is to provide a special oxygen lance device for blast furnace start-up, so as to solve the problem in the traditional start-up process that after the air is supplied, it is necessary to wait for coke and light load materials to arrive at the hearth for heating, generate sufficient slag and iron and discharge before gradually increasing the air supply. This process is particularly long for blast furnaces that have been shut down for restarting production, which seriously delays the start-up progress and leads to the stagnation of the entire production process and the loss of economic benefits.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a special oxygen lance device for blast furnace start-up, wherein a lance head is connected to the top of the lance body, the lance head is conical, and gas delivery holes are evenly spaced on its conical end; a drill bit is connected to the other end of the lance body, and the drill bit is connected to the connecting sleeve of the starter machine.

[0005] The gun body consists of an oxygen pipe and a cooling air pipe, which are integrally formed. The end away from the gun head is closed. The cooling air pipe is sleeved on the outside of the oxygen pipe, leaving an air flow channel between them. Inclined air inlets are symmetrically arranged on the left and right sides of the cooling air pipe. The other end of the air inlets is connected to a gas source through a pipeline. Inclined oxygen inlets are symmetrically connected on the left and right sides of the oxygen pipe. The oxygen inlets and air inlets are staggered. One end of the oxygen inlet passes through the cooling air pipe and is connected to the oxygen pipe at the top. The other end is connected to an oxygen storage tank through a pipeline. A thermocouple tube is connected to the end of the oxygen pipe near the gun head for monitoring the gun head temperature.

[0006] It also includes an air pressure gauge and an air flow meter, which are connected to the air intake pipe and the air source.

[0007] It also includes an oxygen pressure gauge and an oxygen flow meter, and pipelines connecting the oxygen inlet pipe and the oxygen storage tank.

[0008] It also includes a camera tube, whose body is embedded in the annular channel formed by the outer wall of the oxygen tube and the inner wall of the cooling air tube. Its monitoring end is located 10cm behind the nozzle of the oxygen tube. A high-temperature resistant infrared lens is connected to the monitoring end to monitor the coke combustion status through infrared thermal imaging.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] This technology addresses the severe heat shortage and lack of heat in the hearth during the initial stage of restarting newly opened and closed blast furnaces. It enables rapid heating inside the hearth, ensuring sufficient temperature for the first batch of slag and iron, which is then smoothly discharged from the furnace. This significantly reduces the labor intensity in front of the furnace and provides a strong guarantee for the safe, rapid, and efficient production of the blast furnace. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the gun head structure of this utility model.

[0013] Figure 3 This is a schematic diagram of the nozzle gas source outlet distribution structure of this utility model.

[0014] In the diagram: 1. Oxygen tube; 2. Cooling air tube; 3. Air inlet tube; 4. Oxygen inlet tube; 5. Nozzle; 6. Camera tube; 7. Thermocouple tube. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Please refer to Figure 1-3 This utility model provides an embodiment of a special oxygen lance device for blast furnace start-up, comprising a lance body and a lance head 5. The lance head 5 is connected to the top of the lance body and is conical in shape with a hollow internal structure for premixing oxygen with air. The conical structure optimizes penetration power to penetrate the clay layer. The oxygen-air mixture is injected through the gas delivery holes to ignite the coke. The gas delivery holes are equidistantly arranged to facilitate the delivery of the oxygen-air mixture into the furnace, ensuring uniform combustion. The conical end of the lance body has equidistant gas delivery holes. The other end of the lance body is connected to a drill bit, which is connected to the starter machine connecting sleeve.

[0020] The gun body consists of an oxygen pipe 1 and a cooling air pipe 2, which are integrally formed. The oxygen pipe 1 delivers pure oxygen and is made of a high-temperature resistant material. The outer circumference of the oxygen pipe 1 is supported and connected to the inner wall of the cooling air pipe 2 by a support block, forming an annular cooling channel. The end away from the gun head 5 is closed. The cooling air pipe 2 is fitted over the oxygen pipe 1, leaving an airflow channel between them. Inclined air inlets 3 are symmetrically arranged on both sides of the cooling air pipe 2 at an angle of 45°. The inclined, staggered air inlets 3 and oxygen inlets 4 are pre-mixed within the hollow structure of the gun head 5 to prevent internal combustion. The staggered arrangement promotes turbulent mixing of the gases. The other end of the air inlet 3 is connected to a gas source via a pipeline. The air inlet 3 is located near the closed end of the gun body. Air is supplied into the cooling air pipe 2. After entering the cooling air pipe 2 from the end near the closed end of the gun body, the air circulates throughout the entire air circulation channel and mixes at the gun head 5, thereby reducing the temperature of the gun body and the camera tube 6. The oxygen pipe 1 is symmetrically connected to the left and right sides with inclined oxygen inlet pipes 4. The oxygen inlet pipes 4 and the air inlet pipe 3 are staggered. One end of the oxygen inlet pipe 4 passes through the cooling air pipe 2 and supplies oxygen into the oxygen pipe 1. At the same time, the oxygen inlet pipe 4 is located near the closed end of the gun body, with an inclination angle of 45° and its top end is connected to the oxygen pipe 1. The other end is connected to the oxygen storage tank through a pipeline. The end of the oxygen pipe 1 near the gun head 5 is connected to a thermocouple tube 7 for monitoring the temperature of the gun head 5. The thermocouple monitors the temperature of the gun head 5 to prevent gun burn-out accidents. When the temperature is too high, an early warning is issued, and the oxygen supply can be manually cut off.

[0021] It also includes an air pressure gauge and an air flow meter, connected to the air inlet pipe 3 and the air source. The air pressure gauge monitors the air pipeline pressure in real time, and the air flow meter precisely controls the air flow to regulate the cooling air volume. It also includes an oxygen pressure gauge and an oxygen flow meter, connected to the oxygen inlet pipe 4 and the oxygen storage tank. The oxygen pressure gauge monitors the oxygen pipeline pressure in real time, and the oxygen flow meter precisely controls the oxygen flow to prevent pipe bursts and is linked with the camera pipe 6 to dynamically adjust the oxygen delivery flow.

[0022] It also includes a camera tube 6, whose body is embedded in the annular channel formed by the outer wall of the oxygen tube 1 and the inner wall of the cooling air tube 2. Its monitoring end is located 10cm behind the nozzle 5 of the oxygen tube 1. A high-temperature resistant infrared lens is connected to the monitoring end to monitor the coke combustion status through infrared thermal imaging, and at the same time dynamically adjust the oxygen flow to ensure the temperature of the combustion zone.

[0023] In operation, the taphole channel is drilled using a taphole opening machine. Oxygen is then blown into the furnace to ignite the coke inside, producing red-hot coke and providing sufficient space for the oxygen lance to be inserted and successfully ignited. A small amount of water-filled clay, approximately 80-100 kg, is then injected using a hydraulic cannon. After the cannon is withdrawn, the tail end of the oxygen lance is inserted into the taphole opening machine's connecting sleeve and directly injected into the furnace hearth. Oxygen and air are then connected. The oxygen and air are mixed at the lance head 5 via cooling air pipe 2 and oxygen pipe 1, and then delivered into the furnace through the air outlet. Thermocouple tube 7 monitors the temperature at the lance head 5, thereby adjusting the air flow rate. Camera tube 6 monitors the coke combustion in the furnace and sends feedback to the terminal, which then dynamically adjusts the oxygen flow rate.

[0024] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A special oxygen lance device for blast furnace start-up, characterized in that: The gun includes a gun body and a gun head (5). The gun head (5) is connected to the top of the gun body. The gun head (5) is conical and has air supply holes evenly spaced on its conical end. The other end of the gun body is connected to a drill bit, which is connected to the connecting sleeve of the opening machine. The gun body is composed of an oxygen pipe (1) and a cooling air pipe (2). The oxygen pipe (1) and the cooling air pipe (2) are integrally formed and the end away from the gun head (5) is closed. The cooling air pipe (2) is sleeved on the outside of the oxygen pipe (1) and an air flow channel is left between them. Inclined air inlet pipes (3) are symmetrically arranged on the left and right sides of the cooling air pipe (2). The other end of the air inlet pipe (3) is connected to the air source through a pipeline. Inclined oxygen inlet pipes (4) are symmetrically connected on the left and right sides of the oxygen pipe (1). The oxygen inlet pipe (4) and the air inlet pipe (3) are staggered. One end of the oxygen inlet pipe (4) passes through the cooling air pipe (2) and the top end is connected to the oxygen pipe (1). The other end is connected to the oxygen storage tank through a pipeline. A thermocouple tube (7) is connected to the end of the oxygen pipe (1) near the gun head (5) for monitoring the temperature of the gun head (5).

2. The oxygen lance device for blast furnace start-up according to claim 1, characterized in that: It also includes an air pressure gauge and an air flow meter, which are connected to the air intake pipe (3) and the air source.

3. The oxygen lance device for blast furnace start-up according to claim 1, characterized in that: It also includes an oxygen pressure gauge and an oxygen flow meter, which are connected to the oxygen inlet pipe (4) and the oxygen storage tank.

4. The oxygen lance device for blast furnace start-up according to claim 1, characterized in that: It also includes a camera tube (6), whose body is embedded in the annular channel formed by the outer wall of the oxygen tube (1) and the inner wall of the cooling air tube (2). Its monitoring end is located 10cm behind the nozzle (5) of the oxygen tube (1). A high-temperature resistant infrared lens is connected to the monitoring end to monitor the coke combustion status through infrared thermal imaging.

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