Numerical control oxygen lance for blow-in of iron-making blast furnace

Abstract

The numerical control oxygen lance comprises a tubular lance body, and the tubular lance body comprises a lance body front section and a lance body rear section; wherein the gun body front section is used for being inserted into a blast furnace tap hole and stretching into a blast furnace hearth, and the gun body rear section is located outside the tap hole; an air inlet connector is formed in the rear section of the gun body; the rear section of the tubular gun body is provided with a connecting plate, the front end of the connecting plate blocks the rear section of the tubular gun body, and the rear end of the connecting plate is provided with a connector; wherein the tubular gun body is used for conveying mixed gas introduced from the gas inlet connector into a blast furnace hearth from the front section of the gun body; according to the blast furnace tapping hole, the hole is formed in the blast furnace tapping hole, and the tubular gun body extends into the hole, so that a sufficient gas source can be directly provided for combustion of coke at the bottom of the blast furnace, sufficient combustion of the coke is ensured, and the temperature of the blast furnace is rapidly increased.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace ironmaking equipment, and in particular relates to a numerically controlled oxygen blowing gun for opening an ironmaking blast furnace. Background Art

[0002] Blast furnace start-up is a necessary operation for newly built blast furnaces and blast furnaces after overhaul, which is mainly divided into the steps of furnace baking, charging, ignition, and transition to normal production. After the blast furnace is charged, the coke is at the bottom of the blast furnace, and the tuyere is in the middle of the blast furnace. This results in insufficient gas source at the bottom of the blast furnace during ignition and transition to normal production. The gas source of the tuyere needs to be transferred from the furnace to the bottom of the blast furnace. Summary of the invention

[0003] The purpose of the present invention is to provide a numerically controlled oxygen blowing gun for opening an iron-making blast furnace, which can directly feed oxygen from a tap hole to achieve combustion-supporting of coke.

[0004] The present invention adopts the following technical scheme: a numerically controlled oxygen blowing lance for opening an iron-making blast furnace, comprising a tubular lance body, wherein the tubular lance body comprises a lance body front section and a lance body rear section; wherein the lance body front section is used to be inserted into a blast furnace tapping hole and extend into the blast furnace, and the lance body rear section is located outside the tapping hole;

[0005] An air intake port is provided at the rear section of the gun body;

[0006] The rear section of the tubular gun body is provided with a connecting plate, the front end of the connecting plate blocks the rear section of the tubular gun body, and the rear end of the connecting plate is provided with a connecting head;

[0007] The tubular gun body is used to transport the mixed gas introduced from the gas inlet interface from the front section of the gun body to the blast furnace.

[0008] Furthermore, a blocking plate is provided on the outer shell of the tubular gun body;

[0009] The blocking plate is located between the front section of the gun body and the rear section of the gun body, and is used to block the ventilation hole of the blast furnace tapping port, and the ventilation hole is used for the front section of the gun body to pass through.

[0010] Furthermore, the front end of the front section of the gun body is a gas outlet end;

[0011] The air outlet end is provided with a plurality of air outlet holes which penetrate from front to back.

[0012] Furthermore, the air outlet end is tapered, with a small front end and a large rear end.

[0013] Furthermore, the air outlet end is in a frustum shape, with a small front end and a large rear end.

[0014] Furthermore, a sealing layer is provided on the outer shell of the front section of the gun body.

[0015] Furthermore, an image capturing device and a temperature measuring device are arranged in the tubular gun body.

[0016] Furthermore, the air inlet interface is connected with an air mixing bag;

[0017] The gas mixing bag comprises a gas mixing chamber, which is provided with an air inlet, an oxygen inlet and a gas outlet interface.

[0018] Furthermore, the flow direction of the oxygen entering the oxygen inlet is the same as the mixed gas outlet flow rate of the gas outlet interface;

[0019] The air flow direction of the air inlet is the same as the oxygen flow direction, and the angle between the two is less than or equal to 45°.

[0020] Furthermore, a reinforcing plate is provided between the connecting plate and the rear section of the gun body.

[0021] The beneficial effect of the present invention is that by opening a hole on the iron outlet of the blast furnace and extending the tubular gun body into the hole, sufficient gas source can be directly provided for the combustion of coke at the bottom of the blast furnace to ensure full combustion of the coke and quickly heat up the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a numerically controlled oxygen blowing lance for opening an iron-making blast furnace in an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the gas mixing bag in an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the cross section of the gas outlet end in the embodiment of the present invention.

[0025] Among them: 11. Gun body rear section; 12. Gun body front section; 13. Sealing layer; 14. Measuring port; 15. Air inlet interface; 16. Reinforcement plate; 17. Connecting plate; 18. Connector;

[0026] 20. Air outlet end; 21. Air outlet hole;

[0027] 31. First air inlet; 32. Second air inlet; 33. Air outlet interface; 34. Oxygen inlet; 35. Air mixing chamber. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The invention discloses a numerically controlled oxygen blowing gun for opening an iron-making blast furnace. Figure 1As shown, it comprises a tubular gun body, and the tubular gun body comprises a gun body front section 12 and a gun body rear section 11; wherein, the gun body front section 12 is used to be inserted into the blast furnace tapping port and extend into the blast furnace furnace, and the gun body rear section 11 is located outside the tapping port; the gun body rear section 11 is provided with an air inlet interface 15; the rear section of the tubular gun body is provided with a connecting plate 17, the front end of the connecting plate 17 blocks the rear section of the tubular gun body, and the rear end of the connecting plate 17 has a connector 18; wherein, the tubular gun body is used to transport the mixed gas introduced from the air inlet interface 15 from the gun body front section 12 to the blast furnace furnace.

[0030] The present invention can directly provide sufficient gas source for the combustion of coke at the bottom of the blast furnace by opening a hole on the iron outlet of the blast furnace and extending the tubular gun body into the hole, so as to ensure the full combustion of the coke and quickly heat up the blast furnace.

[0031] In the embodiment of the present invention, the front section 12 of the gun body and the rear section 11 of the gun body are integrally formed, and the front section 12 of the gun body extends into the blast furnace through a pre-opened hole, thereby ensuring that the mixed combustion-supporting gas sent in can smoothly reach the location of the coke to achieve combustion-supporting of the coke. The rear section 11 of the gun body is located outside the blast furnace and is responsible for connecting with external equipment and connecting the gas source. At the same time, the oxygen lance and the tapping opening machine can be connected through the connector 18, so that the oxygen lance is driven to move through the tapping opening machine.

[0032] A reinforcing plate 16 is provided between the connecting plate 18 and the rear section 11 of the lance body. The working environment temperature of the oxygen lance is relatively high, and the reinforcing plate 16 can increase the connection strength and keep the overall structure of the oxygen lance from deformation.

[0033] In one embodiment, a plugging plate is provided on the outer shell of the tubular lance body; the plugging plate is located between the front section 12 of the lance body and the rear section 11 of the lance body, and is used to block the vent of the blast furnace tapping hole, and the vent is used for the front section 12 of the lance body to pass through. Specifically, the plugging plate is annular, and is used to block the opening of the tapping hole to prevent the high-temperature flue gas in the blast furnace from being discharged from the gap between the oxygen lance and the hole wall, thereby increasing the safety of operation.

[0034] More preferably, a sealing layer 13 is provided on the outer shell of the front section 12 of the lance body. The sealing layer is used to seal the gap between the oxygen blowing lance and the hole wall, and the sealing layer can usually adopt a common asbestos rope.

[0035] In the present invention, the front end of the front section 12 of the gun body is an air outlet end 20; the air outlet end 20 is provided with a plurality of air outlet holes 21 that penetrate from front to back. When drilling a hole on the tap hole (a hole for the oxygen lance to pass through), the temperature of the drill pipe rises from 200°C to 1400°C as the drill pipe goes deeper, especially when it is close to the furnace, the temperature will exceed 1000°C, which will cause the strength of the drill pipe of the tap hole opening machine to decrease and bend and deform. Therefore, some iron filings or slag may remain near the furnace in the drilled hole. Due to the obstruction of these iron filings or slag, the front end of the tubular gun body will be deformed. Figure 3 As shown, in the present invention, a gas outlet end 20 is provided at the front end of the front section 12 of the lance body. The inside of the gas outlet end 20 is solid, leaving only some gas outlet holes 21, which increases the mechanical strength of the front section of the oxygen blowing lance and prevents the front section from deformation.

[0036] As a specific implementation, the gas outlet end 20 is tapered, with a small front end and a large rear end, such as a cone or pyramid, and its front end tip can push iron filings or slag into the furnace to ensure that the front section 12 of the gun body can be smoothly inserted.

[0037] In addition, the gas outlet end 20 can also be a truncated cone, with a small front end and a large rear end. In this way, the opening of the gas outlet 21 faces the furnace to avoid blockage.

[0038] In the present invention, an image capturing device and a temperature measuring device are provided in the tubular gun body. For example, a measuring port 14 is provided on the rear section 11 of the gun body, a thermocouple and a high-definition camera are installed, and the thermocouple is connected to a digital thermometer, so that the temperature in the oxygen lance can be detected in real time, and the flame image in the furnace can be captured by the high-definition camera, and the flame image is transmitted to the terminal via WIFI connection. The insertion depth of the oxygen lance can be adjusted by observing the display of the temperature and the flame image, and the oxygen-air ratio can be controlled by observing the airflow and pressure, so as to quickly increase the furnace temperature and smoothly tap iron.

[0039] In the embodiment of the present invention, the air inlet interface 15 is connected to a gas mixing bag. Figure 2 As shown, the gas mixing bag includes a gas mixing chamber 35, and the gas mixing chamber 35 is provided with a first air inlet 31, a second air inlet 32, an oxygen inlet 34 and a gas outlet interface 33. Specifically, the flow direction of the oxygen entering the oxygen inlet 34 is the same as the mixed gas outlet flow rate of the gas outlet interface 33; the air flow direction of the air inlet is the same as the oxygen flow direction, and the angle between the two is less than or equal to 45°.

[0040] The high-pressure air and high-pressure oxygen can be mixed in a predetermined ratio through the gas mixing bag, and the ratio of air and oxygen in the mixed gas can be adjusted in time according to the combustion conditions of coke in the furnace.

[0041] In addition, a control valve group is added to the pipeline of the mixing bag, and a flow display, pressure gauge, safety valve, etc. are installed.

[0042] If the blast furnace is put into use after an overhaul, the protective pipe can be buried in advance (to avoid the opening machine from opening holes), the gun body can be wrapped with asbestos rope, and the gun body can be installed on the opening machine to push the iron mouth deep into the material layer to supply air; if it is a short-term furnace maintenance, first use a Φ55 drill bit to pre-open, and then use the opening machine to send in the oxygen blowing gun.

[0043] The use process of the oxygen blowing gun of the present invention is as follows:

[0044] When a blast furnace is newly opened or opened after overhaul, a hole is punched at the tap hole using a tap hole opening machine. After the hole is punched, the connecting head 18 of the oxygen lance is connected to the tap hole opening machine, and the tap hole opening machine drives the front section 12 of the oxygen lance to extend into the hole on the tap hole until the plugging plate is attached to the outer surface of the tap hole. During the insertion of the oxygen lance, the gas outlet end 20 can push the iron slag near the opening into the furnace, ensuring that the front section 12 of the oxygen lance enters the opening smoothly.

[0045] When the front section 12 of the gun body gradually approaches the furnace, the gas outlet end 20 will be heated and melted. At this time, the mixed gas will directly enter the furnace through the front section 12 of the gun body, and the blown mixed gas will directly enter the area where the coke is located to help burn the coke, thereby achieving the effect of directly supplying gas to the coke.

[0046] After use, the iron mouth opening machine drives the oxygen blowing gun to withdraw from the opening, and the mud gun machine seals the opening at the same time, completing the oxygen supply process.

Claims

1. A numerically controlled oxygen blowing gun for opening an iron-making blast furnace, characterized in that: The invention comprises a tubular lance body, wherein the tubular lance body comprises a lance body front section (12) and a lance body rear section (11); wherein the lance body front section (12) is used to be inserted into a blast furnace tapping hole and extend into the blast furnace, and the lance body rear section (11) is located outside the tapping hole; The rear section (11) of the gun body is provided with an air intake interface (15); The rear section of the tubular gun body is provided with a connecting plate (17), the front end of the connecting plate (17) blocks the rear section of the tubular gun body, and the rear end of the connecting plate (17) has a connecting head (18); The tubular gun body is used to transport the mixed gas introduced from the gas inlet interface (15) from the front section (12) of the gun body to the furnace of the blast furnace.

2. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 1, characterized in that: A blocking plate is provided on the outer shell of the tubular gun body; The blocking plate is located between the front section (12) of the lance body and the rear section (11) of the lance body and is used to block the ventilation opening of the blast furnace tapping port, and the ventilation opening is used for the front section (12) of the lance body to pass through.

3. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 2, characterized in that: The front end of the gun body front section (12) is a gas outlet end (20); The air outlet end (20) is provided with a plurality of air outlet holes (21) penetrating from front to back.

4. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 3, characterized in that: The air outlet end (20) is conical, with a small front end and a large rear end.

5. A numerically controlled oxygen blowing lance for opening an iron-making blast furnace as claimed in claim 3, characterized in that: The air outlet end (20) is in the shape of a truncated cone, with a small front end and a large rear end.

6. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 2, 3 or 4, characterized in that: A sealing layer (13) is provided on the outer shell of the front section (12) of the gun body.

7. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 2, characterized in that: An image capturing device and a temperature measuring device are arranged in the tubular gun body.

8. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 4 or 5, characterized in that: The air inlet interface (15) is connected to a gas mixing bag; The gas mixing bag comprises a gas mixing chamber (35), and the gas mixing chamber (35) is provided with an air inlet, an oxygen inlet (34) and a gas outlet interface (33).

9. A numerically controlled oxygen blowing lance for opening an iron-making blast furnace as claimed in claim 8, characterized in that: The flow direction of the oxygen entering the oxygen inlet (34) is the same as the mixed gas outlet flow rate of the gas outlet interface (33); The air flow direction of the air inlet is the same as the oxygen flow direction, and the angle between the two is less than or equal to 45°.

10. A numerically controlled oxygen blowing lance for opening an ironmaking blast furnace as claimed in claim 3, characterized in that: A reinforcing plate (16) is provided between the connecting plate (18) and the rear section (11) of the gun body.

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