Iron notch oxygen lance for starting up blast furnace
By using a sleeve structure and thermocouple-monitored oxygen lance at the taphole, the risks of hearth overheating and equipment damage during blast furnace start-up were resolved, achieving cost savings and rapid start-up.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANYANG IRON & STEEL
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-05
AI Technical Summary
The existing oxygen lances used for blast furnace start-up have problems such as hearth overheating, insufficient heating of furnace body and furnace charge, increased risk of equipment damage and increased operational difficulty, and are also costly.
The iron taphole oxygen lance, which adopts a sleeve structure, uses compressed air to cool the inner tube and mix it with oxygen by setting up a first gas supply pipe, a second gas supply pipe and a connecting pipe. Combined with a thermocouple monitoring device, the temperature is monitored in real time, and the oxygen concentration is flexibly controlled to meet the smelting requirements.
Reduce oxygen consumption, lower costs, quickly heat the furnace hearth, shorten start-up time, and improve operational safety and equipment lifespan.
Smart Images
Figure CN224325355U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of oxygen lance technology, and more specifically, to an oxygen lance for blast furnace start-up. Background Technology
[0002] Blast furnace shutdowns and restarts are frequent and are complex and risky operations that consume large amounts of fuel and flux, resulting in high startup costs.
[0003] The prior art CN 213172421U discloses an oxygen lance for starting a blast furnace, which has an oxygen pipe installed inside the lance body. A nitrogen pipe for cooling and a thermocouple for monitoring are added to the outside of the oxygen pipe. The oxygen blowing status can be judged by combining the temperature data monitored by the thermocouple. The oxygen blowing can safely and effectively melt the slag and iron in the furnace hearth and achieve the purpose of rapidly heating the furnace hearth.
[0004] However, the oxygen lance in the aforementioned existing technology only has a single oxygen channel. When the blast furnace is started, only oxygen is supplied, which may lead to defects such as overheating of the hearth, insufficient heating of the furnace body and furnace charge, increased risk of equipment damage, increased difficulty in operation, and increased cost. Utility Model Content
[0005] The purpose of this application is to provide an oxygen lance for blast furnace start-up, thereby reducing start-up costs.
[0006] This application provides an oxygen lance for starting a blast furnace, employing the following technical solution:
[0007] An oxygen lance for blast furnace start-up includes a lance body and an inner tube. The inner tube is disposed inside the lance body. The lance body is connected to a first gas supply pipe, which is equipped with a first control valve and a second control valve. The inner tube is connected to a second gas supply pipe, which is equipped with a third control valve. A connecting pipe is disposed between the first gas supply pipe and the second gas supply pipe, which is located between the first control valve and the second control valve. A fourth control valve is disposed on the connecting pipe. A thermocouple monitoring device is disposed on the outside of the inner tube, which is located inside the lance body.
[0008] Preferably, a first check valve is provided on the first air supply pipe.
[0009] Preferably, a first pressure gauge is installed on the first air supply pipe.
[0010] Preferably, a second check valve is provided on the second air supply pipe.
[0011] Preferably, a second pressure gauge is installed on the second air supply pipe.
[0012] Preferably, the first control valve, the second control valve, the third control valve, and the fourth control valve are all flow control valves.
[0013] Preferably, both the gun body and the inner tube are made of stainless steel.
[0014] Compared with the prior art, the beneficial effects of this application are as follows:
[0015] The oxygen lance provided in this application adopts a sleeve structure. By setting up a first air supply pipe, a second air supply pipe, and a connecting pipe, and opening the first, second, third, and fourth control valves, one path of compressed air directly enters the interior of the lance body and is used to cool the inner tube. Another path of compressed air enters the interior of the second air supply pipe through the connecting pipe. The compressed air mixes with oxygen and then enters the interior of the inner tube, thereby reducing the amount of oxygen used and saving costs. By adjusting the ratio of oxygen to compressed air, the oxygen concentration during the blowing process can be flexibly controlled, thus adapting to different smelting needs and furnace condition changes.
[0016] The oxygen blowing operation can be judged based on the temperature data monitored by the thermocouple monitoring device, thereby monitoring the temperature change and burn-off of the inner tube in real time. By using the new type of oxygen blowing lance at the taphole of the blast furnace, the preheating of the hearth can be accelerated in the early stage, the ventilation opening and taphole channel can be opened quickly, and the air volume and load can be quickly followed up, further shortening the furnace condition recovery and start-up production time, thus greatly reducing the start-up cost. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] The reference numerals in the attached figures are as follows:
[0020] 1. Gun body; 2. Inner tube; 3. First gas supply pipe; 4. First control valve; 5. Second control valve; 6. Second gas supply pipe; 7. Third control valve; 8. Connecting pipe; 9. Fourth control valve; 10. Thermocouple monitoring device; 11. First check valve; 12. First pressure gauge; 13. Second check valve; 14. Second pressure gauge. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0027] Example
[0028] like Figure 1 As shown in the embodiment of this application, the oxygen lance for blast furnace start-up includes a lance body 1 and an inner tube 2. The inner tube 2 is disposed inside the lance body 1. The lance body 1 is connected to a first air supply pipe 3, which is used to supply compressed air into the interior of the lance body 1. A first control valve 4 and a second control valve 5 are disposed on the first air supply pipe 3. The inner tube 2 is connected to a second air supply pipe 6, which is used to supply oxygen into the interior of the inner tube 2. A third control valve 7 is disposed on the second air supply pipe 6. A connecting pipe 8 is disposed between the first air supply pipe 3 and the second air supply pipe 6. The connecting pipe 8 is located between the first control valve 4 and the second control valve 5. A fourth control valve 9 is disposed on the connecting pipe 8. A thermocouple monitoring device 10 is disposed on the outside of the inner tube 2. The thermocouple monitoring device 10 is located on the inside of the lance body 1.
[0029] In use, the first control valve 4, the second control valve 5, the third control valve 7, and the fourth control valve 9 are opened. One stream of compressed air directly enters the interior of the lance body 1 and is used to cool the inner tube. Another stream of compressed air enters the interior of the second air supply pipe 6 through the connecting pipe 8. The compressed air mixes with oxygen and then enters the interior of the inner tube 2, thereby reducing the amount of oxygen used and saving costs. By adjusting the ratio of oxygen to compressed air, the oxygen concentration during the blowing process can be flexibly controlled to adapt to different smelting needs and furnace condition changes. At the same time, the temperature data monitored by the thermocouple monitoring device 10 can be used to determine the oxygen blowing operation status, thereby monitoring the temperature change and burn-out of the inner tube in real time. By using the new type of oxygen blowing lance at the taphole of the blast furnace, the preheating of the hearth can be accelerated in the early stage, the ventilation opening and taphole channel can be opened quickly, and the air volume and load can be quickly followed up, further shortening the furnace condition recovery and start-up production time, thus greatly reducing the start-up cost.
[0030] In this embodiment, a first check valve 11 is provided on the first air supply pipe 3. The first check valve 11 is used to prevent the backflow of the medium inside the first air supply pipe 3.
[0031] In this embodiment, a first pressure gauge 12 is provided on the first gas supply pipe 3. The first pressure gauge 12 is used to detect the gas pressure inside the first gas supply pipe 3.
[0032] In this embodiment, a second check valve 13 is provided on the second air supply pipe 6. The second check valve 13 is used to prevent the backflow of the medium inside the second air supply pipe 6.
[0033] In this embodiment, a second pressure gauge 14 is provided on the second gas supply pipe 6. The second pressure gauge 14 is used to detect the gas pressure inside the second gas supply pipe 6.
[0034] In this embodiment, the first control valve 4, the second control valve 5, the third control valve 7, and the fourth control valve 9 are all flow control valves. Flow control valves have the characteristics of high control accuracy, which makes it easy to accurately regulate the mixing ratio of oxygen and compressed air.
[0035] In this embodiment, both the gun body 1 and the inner tube 2 are made of stainless steel. Stainless steel has good corrosion resistance and high temperature resistance, which can extend the service life of the oxygen lance.
[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An oxygen lance for starting a blast furnace, characterized in that: The gun includes a gun body and an inner tube. The inner tube is disposed inside the gun body. The gun body is connected to a first gas supply pipe. The first gas supply pipe is equipped with a first control valve and a second control valve. The inner tube is connected to a second gas supply pipe. The second gas supply pipe is equipped with a third control valve. A connecting pipe is disposed between the first gas supply pipe and the second gas supply pipe. The connecting pipe is located between the first control valve and the second control valve. A fourth control valve is disposed on the connecting pipe. A thermocouple monitoring device is disposed on the outside of the inner tube. The thermocouple monitoring device is located on the inside of the gun body.
2. The oxygen lance for blast furnace start-up according to claim 1, characterized in that: A first check valve is installed on the first air supply pipe.
3. The oxygen lance for blast furnace start-up according to claim 2, characterized in that: A first pressure gauge is installed on the first air supply pipe.
4. The oxygen lance for blast furnace start-up according to claim 1, characterized in that: A second check valve is installed on the second air supply pipe.
5. The oxygen lance for blast furnace start-up according to claim 4, characterized in that: A second pressure gauge is installed on the second air supply pipe.
6. The oxygen lance for blast furnace start-up according to claim 1, characterized in that: The first control valve, the second control valve, the third control valve, and the fourth control valve are all flow control valves.
7. The oxygen lance for blast furnace start-up according to claim 1, characterized in that: Both the gun body and the inner tube are made of stainless steel.