阅读说明：本技术 一种转炉冶炼火点区温度连续监测氧枪系统及监测方法 (Converter smelting fire point area temperature continuous monitoring oxygen lance system and monitoring method ) 是由 朱荣 冯超 魏光升 董凯 韩宝臣 朱长富 武文合 姜娟娟 董建锋 吴学涛 苏荣芳 于 2019-10-10 设计创作，主要内容包括：本发明提供一种转炉冶炼火点区温度连续监测氧枪系统及监测方法,属于钢铁冶金技术领域。该氧枪系统包括氧枪、红外温度监测系统、红外温度传感器保护系统、氧枪供氧系统和氧枪冷却水系统。氧枪供氧系统和氧枪冷却水系统与氧枪连接,红外温度监测系统安装在氧枪内部,红外温度传感器保护系统与红外温度监测系统连接。冶炼开始,氧枪冷却系统、氧枪供氧系统和红外温度传感器保护系统开始运行,冶炼时,红外温度传感器监测火点区温度,并返回4-20mA信号,经处理后反馈,实现火点区温度的连续监测。本发明适用于30-400t转炉冶炼火点区温度的连续监测,可实现转炉冶炼过程复杂情况条件下的火点区温度连续监测,为转炉冶炼模型和冶炼工艺提供实时精确的数据。(The invention provides a system and a method for continuously monitoring the temperature of a converter smelting fire point area, belonging to the technical field of ferrous metallurgy. The oxygen lance system comprises an oxygen lance, an infrared temperature monitoring system, an infrared temperature sensor protection system, an oxygen lance oxygen supply system and an oxygen lance cooling water system. The oxygen lance oxygen supply system and the oxygen lance cooling water system are connected with the oxygen lance, the infrared temperature monitoring system is arranged inside the oxygen lance, and the infrared temperature sensor protection system is connected with the infrared temperature monitoring system. When smelting is started, the oxygen lance cooling system, the oxygen lance oxygen supply system and the infrared temperature sensor protection system start to operate, and during smelting, the infrared temperature sensor monitors the temperature of a fire point area and returns a 4-20mA signal, and the signal is processed and then fed back to realize continuous monitoring of the temperature of the fire point area. The invention is suitable for continuously monitoring the temperature of the smelting fire point area of the converter of 30-400t, can realize the continuous monitoring of the temperature of the fire point area under the condition of complex smelting process of the converter, and provides real-time and accurate data for a smelting model and a smelting process of the converter.)

1. The utility model provides a converter smelting fire point district temperature continuous monitoring oxygen rifle system which characterized in that: the oxygen lance oxygen supply system and the oxygen lance cooling water system are respectively connected with the oxygen lance, the infrared temperature monitoring system is arranged in the oxygen lance, and the infrared temperature sensor protection system is connected with the infrared temperature monitoring system;

the oxygen lance comprises an oxygen lance nozzle (1-1) and an oxygen lance body (1-2), wherein the oxygen lance nozzle (1-1) is arranged at the front end of the oxygen lance body (1-2); the infrared temperature monitoring system comprises an infrared temperature sensor (2-1), a signal transmission cable (2-2), a protective sleeve (2-3) and a computer processing system (2-4), wherein the infrared temperature sensor (2-1) is arranged inside the oxygen lance nozzle (1-1), the infrared temperature sensor (2-1) is connected with the computer processing system (2-4) through the signal transmission cable (2-2), and the protective sleeve (2-3) is wrapped outside the signal transmission cable (2-2); the infrared temperature sensor protection system comprises a first air storage tank (3-1) and a first air transmission pipeline (3-2), wherein the first air storage tank (3-1) is connected with the first air transmission pipeline (3-2), and the first air transmission pipeline (3-1) is connected with an air inlet of the protection sleeve (2-3); the oxygen lance oxygen supply system comprises a second gas storage tank (4-1) and a second gas transmission pipeline (4-2), one end of the second gas transmission pipeline (4-2) is connected with the second gas storage tank (4-1), and the other end of the second gas transmission pipeline is connected with a central pipe of the oxygen lance; the oxygen lance cooling water system comprises a cooling water circulation system (5-1), a water inlet pipeline (5-2) and a water return pipeline (5-3), wherein one end of each of the water inlet pipeline (5-2) and the water return pipeline (5-3) is connected with the cooling water circulation system (5-1), and the other end of each of the water inlet pipeline (5-2) and the water return pipeline (5-3) is connected with an oxygen lance.

2. The system of claim 1, wherein the system comprises: the material of the oxygen lance nozzle (1-1) is one of T1 copper, T2 copper or Tu1 copper, the material of the oxygen lance body (1-2) is one of steel or a mixed material of steel and stainless steel, and the outer pipe of the oxygen lance body (1-2) is a straight pipe or a conical pipe.

3. The system of claim 1, wherein the system comprises: the gas flow range of the infrared temperature sensor protection system is 100-30000Nm³/h。

4. The system of claim 1, wherein the system comprises: the gas in the second gas storage tank (4-1) is O₂Or O₂、CO₂And N₂The gas flow range of the oxygen lance oxygen supply system is 5000-95000Nm³The gas pressure range is 0.5-2.0 MPa.

5. The system of claim 1, wherein the system comprises: the water flow range of the oxygen lance cooling water system is 50-800m³The temperature of the inlet water is less than 35 ℃ and the temperature rise is less than 20 ℃.

6. The system of claim 1, wherein the system comprises: the spray hole arrangement form of the oxygen lance spray head (1-1) is one of porous uniform arrangement + central hole, porous multi-angle arrangement + central hole, porous layered arrangement + central hole, and the included angle between the central hole angle and the porous axis is 0-90 degrees.

7. The system of claim 1, wherein the system comprises: the gas in the gas storage tank I (3-2) is N₂、Ar、CO₂Or N₂、Ar、CO₂The mixed gas of (1).

8. The method for monitoring the temperature of the converter smelting fire point zone continuously monitoring oxygen lance system according to the claim 1 is characterized in that: an infrared temperature sensor (2-1) arranged in an oxygen lance nozzle (1-2) is used for testing a high-temperature fire point area of a reaction liquid level of a high-speed jet flow and a molten pool, an infrared signal transmits a 4-20mA signal to a computer processing system (2-4) through a signal transmission cable (2-2) to be processed into a digital signal, real-time continuous measurement of the temperature of the fire point area is realized, and a protective sleeve (2-3) sprays protective gas in the using process to play a role in cooling and protecting the infrared temperature sensor (2-1).

9. The method for continuously monitoring the temperature of the converter smelting fire point area according to claim 8, characterized by comprising the following steps: the method comprises the following specific steps:

s1: after the converter is charged with iron, the converter mouth is shaken, an oxygen lance cooling water system is opened and an oxygen lance is descended, after the oxygen lance descends to the lower part of the converter mouth, an infrared temperature monitoring system, an infrared temperature sensor protection system and an oxygen lance oxygen supply system are opened, and the oxygen lance is descended to the smelting lance position continuously;

s2: the temperature of a fire point area at different periods of smelting is measured by an infrared temperature sensor (2-1), a 4-20mA electric signal is transmitted to a computer processing system (2-4) through a signal transmission cable (2-2) to be processed into a digital signal, and data is recorded;

s3: after smelting, when the oxygen lance is lifted to the position below a furnace mouth, the infrared temperature monitoring system, the infrared temperature sensor protection system and the oxygen lance oxygen supply system are closed, and after the oxygen lance is lifted to the position above the cooling smoke cover, the oxygen lance cooling water system is closed.

Technical Field

The invention relates to the technical field of ferrous metallurgy, in particular to a system and a method for continuously monitoring an oxygen lance in a converter smelting fire point area.

Background

In the converter steelmaking process, the high-speed oxidizing gas and the high-temperature molten metal are subjected to physical and chemical reactions, iron in a high-temperature ignition region is evaporated, a large amount of converter smoke is generated, and timely and accurate regulation and control measures cannot be taken.

The temperature change of the high-temperature fire point area has great influence on the generation of converter smoke dust, the establishment and optimization of a smelting automatic model and the stable control of a smelting process, but the environment in the converter is very complex due to the physicochemical change of high-temperature gas-slag-gold multiphase in the smelting process of the converter, and the temperature of the fire point area is difficult to measure.

The temperature changes of the fire point areas of different smelting processes are different, so that the temperature changes of the fire point areas are measured, the charging system, the slagging system and the oxygen supply system are adjusted, the temperature of the fire point areas can be effectively controlled, the burning loss of metal materials is reduced, and meanwhile, real-time and accurate data support can be provided for the establishment of a converter smelting model and the optimization of the smelting process.

Disclosure of Invention

The invention provides a system and a method for continuously monitoring the temperature of a converter smelting fire point area, which aim to solve the problem that the fire point area is difficult to monitor in the converter smelting process.

The oxygen lance system comprises an oxygen lance, an infrared temperature monitoring system, an infrared temperature sensor protection system, an oxygen lance oxygen supply system and an oxygen lance cooling water system, wherein the oxygen lance oxygen supply system and the oxygen lance cooling water system are respectively connected with the oxygen lance;

the oxygen lance comprises an oxygen lance nozzle and an oxygen lance body, and the oxygen lance nozzle is arranged at the front end of the oxygen lance body; the infrared temperature monitoring system comprises an infrared temperature sensor, a signal transmission cable, a protective sleeve and a computer processing system, wherein the infrared temperature sensor is arranged inside the oxygen lance nozzle, the infrared temperature sensor is connected with the computer processing system through the signal transmission cable, and the protective sleeve is wrapped outside the signal transmission cable; the infrared temperature sensor protection system comprises a first gas storage tank and a first gas transmission pipeline, wherein the first gas storage tank is connected with the first gas transmission pipeline which is connected with a gas inlet of the protection sleeve; the oxygen lance oxygen supply system comprises a second gas storage tank and a second gas transmission pipeline, wherein one end of the second gas transmission pipeline is connected with the second gas storage tank, and the other end of the second gas transmission pipeline is connected with a central pipe of the oxygen lance; the oxygen lance cooling water system comprises a cooling water circulation system, a water inlet pipeline and a water return pipeline, wherein one end of each of the water inlet pipeline and the water return pipeline is connected with the cooling water circulation system, and the other end of each of the water inlet pipeline and the water return pipeline is connected with the oxygen lance.

Wherein the material of the oxygen lance nozzle is one of T1 copper, T2 copper or Tu1 copper, the material of the oxygen lance body is one of steel or a mixed material of steel and stainless steel, and the outer pipe of the oxygen lance body is a straight pipe or a conical pipe.

The gas flow range of the infrared temperature sensor protection system is 100-30000Nm³/h。

The gas in the second gas storage tank is O₂Or O₂、CO₂And N₂The gas flow range of the oxygen lance oxygen supply system is 5000-95000Nm³H, gas pressureThe range is 0.5-2.0 MPa.

The water flow range of the oxygen lance cooling water system is 50-800m³The temperature of the inlet water is less than 35 ℃ and the temperature rise is less than 20 ℃.

The spray hole arrangement form of the oxygen lance spray head is one of porous uniform arrangement + central hole, porous multi-angle arrangement + central hole, porous layered arrangement + central hole, and the included angle between the central hole angle and the axis of the porous is 0-90 degrees.

The gas in the gas storage tank I is N₂、Ar、CO₂Or N₂、Ar、CO₂The mixed gas of (1).

The monitoring method applying the oxygen lance system is roughly as follows: the high-temperature fire point region of the reaction liquid level of the high-speed jet flow and the molten pool is tested by utilizing the infrared temperature sensor arranged in the oxygen lance nozzle, 4-20mA signals are transmitted to a computer processing system through a signal transmission cable to be processed into digital signals, the real-time continuous measurement of the temperature of the fire point region is realized, and protective sleeve jets protective gas in the using process to play a role in cooling and protecting the infrared temperature sensor.

The method comprises the following specific steps:

s1: after the converter is charged with iron, the converter mouth is shaken, an oxygen lance cooling water system is opened and an oxygen lance is descended, after the oxygen lance descends to the lower part of the converter mouth, an infrared temperature monitoring system, an infrared temperature sensor protection system and an oxygen lance oxygen supply system are opened, and the oxygen lance is descended to the smelting lance position continuously;

s2: measuring the temperature of the fire point area in different smelting periods by using an infrared temperature sensor, transmitting a 4-20mA electric signal to a computer processing system through a signal transmission cable, processing the electric signal into a digital signal, and recording data;

s3: after smelting, when the oxygen lance is lifted to the position below a furnace mouth, the infrared temperature monitoring system, the infrared temperature sensor protection system and the oxygen lance oxygen supply system are closed, and after the oxygen lance is lifted to the position above the cooling smoke cover, the oxygen lance cooling water system is closed.

The technical scheme of the invention has the following beneficial effects:

in the scheme, a method and an oxygen lance system are provided for measuring the temperature of a converter smelting fire point area; the scheme is changed according to the temperature of the fire point areaThe monitoring data of the smelting is optimized for the charging system and the slagging system of the converter smelting, the selection of the smelting process, the reduction of the metal material burning loss and the iron evaporation and the CO of the converter smelting₂Or N₂The mixing proportion provides data support, and an effective method is adopted by combining monitoring data, so that the emission of smelting smoke and dust and the consumption of steel materials are reduced.

Drawings

FIG. 1 is a schematic structural view of an oxygen lance system for continuously monitoring the temperature of a converter smelting fire point zone according to the present invention;

FIG. 2 is a schematic view of the structure of an oxygen lance nozzle in the oxygen lance system for continuously monitoring the temperature of the converter smelting fire point zone.

Wherein: 1-1: an oxygen lance nozzle; 1-2: an oxygen lance body; 2-1: an infrared temperature sensor; 2-2: a signal transmission cable; 2-3: protecting the sleeve; 2-4: a computer processing system; 3-1: a first gas storage tank; 3-2: a gas transmission pipeline I; 4-1: a second gas storage tank; 4-2: a gas transmission pipeline II; 5-1: a cooling water circulation system; 5-2: a water inlet pipeline; 5-3: a water return pipeline.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides an oxygen lance system and a monitoring method for continuously monitoring the temperature of a converter smelting fire point area.

As shown in figure 1, the oxygen lance system comprises an oxygen lance, an infrared temperature monitoring system, an infrared temperature sensor protection system, an oxygen lance oxygen supply system and an oxygen lance cooling water system, wherein the oxygen lance oxygen supply system and the oxygen lance cooling water system are respectively connected with the oxygen lance, the infrared temperature monitoring system is arranged in the oxygen lance, and the infrared temperature sensor protection system is connected with the infrared temperature monitoring system;

wherein the oxygen lance comprises an oxygen lance nozzle 1-1 and an oxygen lance body 1-2, and the oxygen lance nozzle 1-1 is arranged at the front end of the oxygen lance body 1-2; the infrared temperature monitoring system comprises an infrared temperature sensor 2-1, a signal transmission cable 2-2, a protective sleeve 2-3 and a computer processing system 2-4, as shown in figure 2, the infrared temperature sensor 2-1 is arranged inside the oxygen lance nozzle 1-1, the infrared temperature sensor 2-1 is connected with the computer processing system 2-4 through the signal transmission cable 2-2, and the protective sleeve 2-3 is wrapped outside the signal transmission cable 2-2; the infrared temperature sensor protection system comprises a first air storage tank 3-1 and a first air transmission pipeline 3-2, wherein the first air storage tank 3-1 is connected with the first air transmission pipeline 3-2, and the first air transmission pipeline 3-1 is connected with an air inlet of the protection sleeve 2-3; the oxygen lance oxygen supply system comprises a second gas storage tank 4-1 and a second gas transmission pipeline 4-2, one end of the second gas transmission pipeline 4-2 is connected with the second gas storage tank 4-1, and the other end of the second gas transmission pipeline is connected with a central pipe of the oxygen lance; the oxygen lance cooling water system comprises a cooling water circulation system 5-1, a water inlet pipeline 5-2 and a water return pipeline 5-3, wherein one end of each of the water inlet pipeline 5-2 and the water return pipeline 5-3 is connected with the cooling water circulation system 5-1, and the other end of each of the water inlet pipeline 5-2 and the water return pipeline 5-3 is connected with an oxygen lance.

The method for applying the oxygen lance system is roughly as follows: an infrared temperature sensor 2-1 arranged in an oxygen lance nozzle 1-2 is used for testing a high-temperature fire point area of a reaction liquid level of a high-speed jet flow and a molten pool, an infrared signal transmits a 4-20mA signal to a computer processing system 2-4 through a signal transmission cable 2-2 to be processed into a digital signal, real-time continuous measurement of the temperature of the fire point area is realized, and a protective sleeve 2-3 blows protective gas in the using process to play a role in cooling protection on the infrared temperature sensor 2-1.

The following description is given with reference to specific examples.

1) The method is applied to monitoring the temperature of a 300t converter smelting fire point area, and an oxygen lance is selected, wherein the diameter of an outer pipe of the oxygen lance is 402mm, the outer diameter of a central pipe is 273mm, and O is₂With CO₂Gas flow 53000Nm of the mixture³/h，CO₂The mixing proportion is 5 percent, the gas supply pressure is 1.0MPa, 5 holes of the oxygen lance nozzle are uniformly distributed and are provided with a central hole, the angle of the central hole is parallel to the axis of the spray hole, the angle is 15 degrees, the diameter of the central hole is 20mm, and CO is₂Flow 2000Nm³/h；

2) After the converter is added with iron, the furnace mouth is shaken to the vertical position to prepare for smelting operation;

3) switching on an infrared temperature sensor 24VDC power supply, after data signals are displayed normally, opening an oxygen lance cooling water system, starting to descend the oxygen lance to a position 500mm below a furnace mouth, opening an oxygen lance oxygen supply system and infrared temperature sensor protective gas, continuing to descend the oxygen lance and confirming ignition, adjusting the oxygen lance position according to smelting process requirements, and turning to redThe outer temperature sensor transmits the signal to the fire point area, the 0-20mA electric signal is transmitted to the computer processing system through the signal transmission cable, the signal is converted into a digital signal after being processed and automatically stored, the real-time continuous monitoring of the temperature of the fire point area is realized, and the CO is dynamically adjusted according to the temperature change condition of the fire point area₂The mixing proportion, the oxygen lance position and the slag former adding time point and the adding amount realize the reduction of iron burning loss and the improvement of the metal material yield.

4) After smelting, lifting the oxygen lance to a furnace mouth for 500mm, closing protective gas of an oxygen supply system of the oxygen lance and an infrared temperature sensor, continuously lifting the oxygen lance to the position above the cooling smoke hood, closing a cooling water system of the oxygen lance and disconnecting a 24VDC power supply of the infrared temperature sensor, shaking the converter to a tapping angle, and preparing to tap steel.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.