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

Abstract

The utility model discloses a numerical control oxygen lance for blowing in an iron-making blast furnace, which 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; the blast furnace taphole is provided with the hole, and the tubular gun body extends into the hole, so that a sufficient gas source can be directly provided for the combustion of coke at the bottom of the blast furnace, the sufficient combustion of the coke is ensured, and the temperature of the blast furnace is quickly increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace ironmaking equipment, in particular to a digitally 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 those undergoing overhaul. It primarily involves steps such as furnace drying, charging, ignition, and transition to normal production. After charging, the coke is located at the bottom of the blast furnace, while the tuyere is in the middle. This results in a lack of sufficient air supply at the bottom of the blast furnace during ignition and transition to normal production. Therefore, the air supply for the tuyere must be transferred from the furnace interior to the bottom of the blast furnace. Utility Model Content

[0003] The utility model aims to provide a digitally controlled oxygen blowing gun for opening an ironmaking blast furnace, which can directly feed oxygen from a taphole to achieve combustion-supporting effect on coke.

[0004] The utility model adopts the following technical solution: a numerically controlled oxygen blowing lance for opening an ironmaking blast furnace, comprising a tubular lance body, the tubular lance body comprising a lance body front section and a lance body rear section; wherein the lance body front section is used to be inserted into the blast furnace taphole and extend into the blast furnace hearth, and the lance body rear section is located outside the taphole;

[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 connector;

[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 hearth.

[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 and the rear section of the lance body and is used to block the ventilation opening of the blast furnace taphole, and the ventilation opening is used for the front section of the lance body to pass through.

[0010] Furthermore, the front end of the front section of the gun body is an air outlet end;

[0011] The air outlet end is provided with a plurality of air outlet holes running through 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 provided in the tubular gun body.

[0016] Furthermore, the air inlet interface is connected to 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 flow rate of the mixed gas out 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 reinforcement plate is provided between the connecting plate and the rear section of the gun body.

[0021] The beneficial effect of the utility model is that the utility model 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a numerically controlled oxygen blowing lance for opening an ironmaking blast furnace in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the gas mixing bag in the embodiment of the present utility model;

[0024] Figure 3 It is a cross-sectional schematic diagram of the air outlet end in an embodiment of the present utility model.

[0025] Among them: 11. Gun body rear section; 12. Gun body front section; 13. Sealing layer; 14. Measuring port; 15. Air inlet port; 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; 34. Oxygen inlet; 35. Gas mixing chamber. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] The utility model discloses a digitally controlled oxygen blowing gun for opening an ironmaking blast furnace. Figure 1As shown, it includes a tubular gun body, which includes 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 taphole and extend into the blast furnace furnace, and the gun body rear section 11 is located outside the taphole; 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 utility model opens a hole on the iron outlet of the blast furnace and extends the tubular gun body into the hole, which can directly provide sufficient gas source for the combustion of coke at the bottom of the blast furnace, thereby ensuring the full combustion of the coke and quickly heating the blast furnace.

[0031] In this embodiment of the utility model, the front section 12 and rear section 11 of the lance body are integrally formed. The front section 12 extends into the blast furnace through a pre-drilled hole, ensuring that the introduced mixed combustion gas can smoothly reach the coke position to assist in its combustion. The rear section 11 of the lance body is located outside the blast furnace and is responsible for connecting to external equipment and the gas source. Furthermore, a connector 18 connects the oxygen lance to the taphole opening machine, thereby driving the oxygen lance movement through the opening machine.

[0032] A reinforcing plate 16 is provided between the connecting plate 17 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 blocking plate is provided on the outer shell of the tubular lance body; the blocking plate is located between the lance body front section 12 and the lance body rear section 11 and is used to block the vent of the blast furnace taphole, which is used to allow the lance body front section 12 to pass through. Specifically, the blocking plate is annular and is used to block the taphole opening, preventing high-temperature flue gas in the blast furnace from escaping through the gap between the oxygen lance and the hole wall, thereby increasing operational safety.

[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 lance and the hole wall, and the sealing layer can usually be made of commonly used asbestos rope.

[0035] In the present invention, the front end of the front section 12 of the gun body is the air outlet end 20; the air outlet end 20 is provided with a plurality of air outlet holes 21 running from front to back. When drilling a hole in the taphole (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 approaches the furnace, the temperature will exceed 1000°C, which will cause the strength of the drill pipe of the taphole opening machine to decrease and cause bending and deformation. 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, an air outlet end 20 is provided at the front end of the front section 12 of the lance body. The interior of the air outlet end 20 is solid, leaving only some air outlet holes 21. This will increase the mechanical strength of the front section of the oxygen lance and prevent 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. The front end tip can push iron chips or slag into the furnace, ensuring 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 frustum, with a small front end and a large rear end. Like this, the opening of the gas outlet 21 is towards the furnace, which can avoid clogging.

[0038] In the present invention, an image capture device and a temperature measurement device are provided within the tubular lance body. For example, a measuring port 14 is provided on the rear section 11 of the lance body, into which a thermocouple and a high-definition camera are installed. The thermocouple is connected to a digital thermometer, allowing real-time monitoring of the temperature within the oxygen lance. The high-definition camera captures the flame image within the furnace, which is then transmitted to a terminal via Wi-Fi. By observing the temperature and flame image, the insertion depth of the oxygen lance can be adjusted, and the oxygen-air ratio can be controlled by observing the airflow and pressure, thereby rapidly raising the furnace temperature and ensuring smooth iron tapping.

[0039] In the embodiment of the present utility model, 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, which is provided with a first air inlet 31, a second air inlet 32, an oxygen inlet 34, and an air outlet port 33. Specifically, the flow direction of the oxygen entering the oxygen inlet 34 is the same as the flow rate of the mixed gas out of the air outlet port 33; the flow direction of the air inlet is the same as the flow direction of the oxygen, and the angle between the two is less than or equal to 45 degrees.

[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 overhaul, the protective pipe can be buried in advance (to avoid the opening machine from opening holes), the gun body is wrapped with asbestos rope, and the gun body is 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 utility model oxygen blowing gun is as follows:

[0044] When a blast furnace is newly opened or opened after overhaul, a taphole opening machine is used to drill a hole in the taphole. After drilling is completed, the connector 18 of the oxygen lance is connected to the taphole opening machine, and the taphole opening machine drives the front section 12 of the oxygen lance body to extend into the opening in the taphole until the blocking plate is attached to the outer surface of the taphole. During the insertion of the oxygen lance, the gas outlet end 20 can push the iron slag near the opening of the furnace into the furnace, ensuring that the front section 12 of the oxygen lance body can smoothly enter the opening.

[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. The blown mixed gas directly enters the area where the coke is located, helping to 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 lance for opening an ironmaking blast furnace, characterized in that: The invention comprises a tubular gun body, wherein 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 hole and extend into the blast furnace hearth, and the gun body rear section (11) is located outside the tapping hole; The rear section (11) of the gun body 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 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 blast furnace hearth.

2. A numerically controlled oxygen lance for opening an ironmaking blast furnace according to 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 hole, and the ventilation opening is used for the front section (12) of the lance body to pass through.

3. A numerically controlled oxygen 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 an air outlet end (20); The air outlet end (20) is provided with a plurality of air outlet holes (21) extending from front to back.

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

5. A numerically controlled oxygen lance for opening an ironmaking 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 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 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 provided in the tubular gun body.

8. A numerically controlled oxygen 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 an air 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 lance for opening an ironmaking 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 lance for opening an ironmaking blast furnace as claimed in claim 3, characterized in that: A reinforcement plate (16) is provided between the connecting plate (17) and the rear section (11) of the gun body.

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