Iron notch oxygen lance device

Abstract

The utility model relates to an iron notch oxygen lance device, and belongs to the technical field of blast furnace equipment in the metallurgical industry. According to the technical scheme, a second pipe section (15) is arranged in an oxygen lance outer pipe (2), and a first pipe section (14) and a third pipe section (16) extend out of the oxygen lance outer pipe; a copper pipe (13) is arranged in the front end of the second pipe section, and an anti-deviation support (3) is welded to the outer surface of the second pipe section. A gap is formed between the pipe section II and the oxygen lance outer pipe and is filled with an iron runner pouring material (5); the front end of the K-type thermocouple (4) is arranged in the gap, and the rear end of the K-type thermocouple (4) extends out of the oxygen lance outer tube and is connected with a digital display instrument (12); the front end of the third pipe section is connected with a pressure gauge (6), the middle is connected with a compressed air pipeline and an oxygen pipeline through high-pressure rubber pipes, and the rear end is provided with a tuyere sight glass. The furnace cylinder can be rapidly heated, smoothness of a blast furnace tuyere and an iron notch is guaranteed, an oxygen lance is prevented from burning refractory materials and cooling equipment at the iron notch, slag iron can permeate into the furnace cylinder in time, and molten slag iron is prevented from being accumulated in front of the tuyere and burning out the tuyere.

Description

Technical Field

[0001] The utility model relates to a taphole oxygen lance device, belonging to the technical field of blast furnace equipment in the metallurgical industry. Background Art

[0002] Due to environmental protection restrictions, a certain ironmaking plant had a blast furnace that was stuffy. After the furnace was opened and air was supplied, the physical heat of the furnace was low, and the slag and iron at the tuyere could not quickly penetrate into the furnace, causing the tuyere to burn, making iron tapping difficult, and prolonging the recovery time, which was not conducive to safe production. Secondly, the original oxygen lance was easily burned after the slag and iron penetrated the furnace, and the status of the oxygen lance could not be detected, resulting in burning of the iron mouth refractory, and in severe cases, burning of the cooling wall at the iron mouth and other serious consequences, which could not guarantee safe production. Utility Model Content

[0003] The utility model aims to provide a taphole oxygen lance device, in which an oxygen lance is buried at the taphole, which not only improves production efficiency and can quickly increase the furnace temperature, but also ensures that the blast furnace tuyere and taphole are unobstructed, so that slag and iron can penetrate into the furnace in time, and also prevents the taphole refractory and cooling equipment from being burned, thereby ensuring safe production and solving the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A iron mouth oxygen lance device comprises an oxygen lance inner tube, an oxygen lance outer tube, an anti-deviation bracket, a K-type thermocouple, a pressure gauge, an air outlet sight glass, a digital display and a copper tube, wherein the oxygen lance inner tube comprises a pipe section 1, a pipe section 2 and a pipe section 3 which are connected in sequence, and the pipe sections 1, 2 and 3 are made as one body; the pipe section 2 is arranged inside the oxygen lance outer tube, and the pipe section 1 and the pipe section 3 extend out of the oxygen lance outer tube; a plurality of copper tubes are arranged inside the front end of the pipe section 2, and a plurality of anti-deviation brackets are welded on the outer surface of the pipe section 2; a gap is arranged between the pipe section 2 and the oxygen lance outer tube, and the gap is filled with iron ditch casting material; the front end of the K-type thermocouple is arranged in the gap, and the rear end extends out of the oxygen lance outer tube and is connected to the digital display; the front end of the pipe section 3 is connected to the pressure gauge, and the middle part is connected to a compressed air pipeline and an oxygen pipeline through a high-pressure rubber hose, and the rear end is provided with an air outlet sight glass, and compressed air and oxygen are respectively introduced into the compressed air pipeline and the oxygen pipeline.

[0006] The high-pressure rubber hose comprises a main line, branch line 1 and branch line 2. One end of the main line is connected to the pipe section 3, and the other end is divided into two branches, namely branch line 1 and branch line 2. Branch line 1 and branch line 2 are respectively connected to the compressed air pipeline and the oxygen pipeline.

[0007] A ball valve is arranged on the pipe section three between the high-pressure rubber hose and the air port sight glass, a compressed air valve is arranged between the branch line one and the compressed air pipeline, and an oxygen valve is arranged between the branch line two and the oxygen pipeline.

[0008] The front end of the pipe section 3 is connected to the pressure gauge through a short pipe.

[0009] The ball valve, compressed air valve and oxygen valve are all DN20 manual ball valves.

[0010] The inner tube of the oxygen lance is a DN20×3.5mm stainless steel tube; the outer tube of the oxygen lance is a DN50×5mm thick-walled seamless steel tube; the copper tube is a DN20×3.5mm copper tube with a length of 200mm; and the short tube is a DN20×3.5mm stainless steel tube.

[0011] The compressed air pipeline and oxygen pipeline are both Φ20mm short sections with wire.

[0012] The K-type thermocouple has a temperature measurement range of 0-1200°C and a length of 5m.

[0013] The gap between the pipe section 1 of the inner pipe of the oxygen lance and the iron mouth channel is filled with mud sheath material.

[0014] The utility model is installed at the iron mouth, inserted into the furnace cylinder from the iron mouth, the gap between the outer tube of the oxygen gun and the iron mouth channel is filled with mud sheathing, and the part entering the furnace cylinder is wrapped with mud to prevent burning; the oxygen pipeline and the compressed air pipeline are connected with a high-pressure hose on the outside of the furnace cylinder, and a small amount of oxygen and compressed air are introduced before air supply, and the compressed air is used to prevent the oxygen gun from burning, and oxygen is gradually added in combination with the blast furnace wind pressure and air volume and the blast furnace unloading amount; according to the temperature displayed by the K-type thermocouple inside the oxygen gun and the display of the pressure gauge, the iron tapping is determined, when the temperature of the K-type thermocouple reaches 400°C, or the pressure gauge pointer vibrates, the oxygen gun ball valve is closed, the air port sight glass is removed, and the oxygen amount is continuously increased to reduce the compressed air amount entering the blast furnace; when the temperature of the K-type thermocouple reaches 700°C, or the vibration force of the pressure gauge is relatively large, the iron tapping condition is met, the compressed air valve is closed, the ball valve is opened, the oxygen valve is closed, and the slag iron flows out along the oxygen gun.

[0015] The beneficial effects of the utility model are: it can quickly increase the temperature of the blast furnace hearth, ensure the smooth flow of the blast furnace tuyere and the iron mouth, prevent the oxygen lance from burning the iron mouth refractory and cooling equipment, and the slag can penetrate into the furnace hearth in time to prevent the molten slag from accumulating in front of the tuyere and burning the tuyere, reduce the labor intensity of the workers in front of the furnace, and save the oxygen burning pipe in front of the furnace; it has the characteristics of simple processing, low cost, easy operation and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] In the figure: oxygen lance inner tube 1, oxygen lance outer tube 2, anti-deviation bracket 3, K-type thermocouple 4, iron ditch casting material 5, pressure gauge 6, ball valve 7, compressed air 8, oxygen 9, high-pressure hose 10, air vent sight glass 11, digital display 12, copper tube 13, pipe section 1 14, pipe section 2 15, pipe section 3 16, compressed air pipeline 17, oxygen pipeline 18, compressed air valve 19, oxygen valve 20, main pipeline 21, branch 1 22, branch 2 23, short pipe 24. DETAILED DESCRIPTION

[0018] The present invention will be further described below through examples in conjunction with the accompanying drawings.

[0019] A iron mouth oxygen lance device comprises an oxygen lance inner tube 1, an oxygen lance outer tube 2, an anti-deviation bracket 3, a K-type thermocouple 4, a pressure gauge 6, an air inlet sight glass 11, a digital display 12 and a copper tube 13. The oxygen lance inner tube 1 comprises a pipe section 14, a pipe section 2 15 and a pipe section 3 16 which are connected in sequence. The pipe section 14, the pipe section 2 15 and the pipe section 3 16 are made as one body. The pipe section 2 15 is arranged inside the oxygen lance outer tube 2, and the pipe section 1 14 and the pipe section 3 16 extend out of the oxygen lance outer tube 2. A plurality of copper tubes 13 are arranged inside the front end of the pipe section 2 15. A plurality of anti-deviation brackets 3 are welded on the outer surface of the pipe section 2 15; a gap is provided between the pipe section 2 15 and the oxygen lance outer tube 2, and the gap is filled with iron ditch casting material 5; the front end of the K-type thermocouple 4 is arranged in the gap, and the rear end extends out of the oxygen lance outer tube 2 and is connected to the digital display 12; the front end of the pipe section 3 16 is connected to the pressure gauge 6, and the middle part is connected to the compressed air pipeline 17 and the oxygen pipeline 18 through the high-pressure rubber hose 10, and the rear end is provided with an air vent sight glass 11, and the compressed air pipeline 17 and the oxygen pipeline 18 are respectively introduced with compressed air 8 and oxygen 9.

[0020] The high-pressure hose 10 comprises a main line 21, a branch line 1 22 and a branch line 2 23. One end of the main line 21 is connected to the pipe section 3 16, and the other end is divided into two branches, namely, branch line 1 22 and branch line 2 23. Branch line 1 22 and branch line 2 23 are connected to the compressed air pipeline 17 and the oxygen pipeline 18 respectively.

[0021] A ball valve 7 is provided on the pipe section three 16 between the high-pressure rubber hose 10 and the air vent sight glass 11, a compressed air valve 19 is provided between the branch one 22 and the compressed air pipeline 17, and an oxygen valve 20 is provided between the branch two 23 and the oxygen pipeline 18.

[0022] The front end of the pipe section 3 16 is connected to the pressure gauge 6 through a short pipe 24, and the pressure gauge 6 is a 1MPa pressure gauge.

[0023] The ball valve 7, the compressed air valve 19 and the oxygen valve 20 are all DN20 manual ball valves.

[0024] The oxygen lance inner tube 1 is a DN20×3.5mm stainless steel tube; the oxygen lance outer tube 2 is a DN50×5mm thick-walled seamless steel tube; the copper tube 13 is a DN20×3.5mm copper tube with a length of 200mm; and the short tube 24 is a DN20×3.5mm stainless steel tube.

[0025] The compressed air pipeline 17 and the oxygen pipeline 18 are both Φ20mm short sections with wire.

[0026] The K-type thermocouple 4 has a measuring temperature range of 0-1200° C. and a length of 5 m.

[0027] The gap between the pipe section 14 of the oxygen lance inner pipe 1 and the iron mouth channel is filled with mud sheath material.

[0028] In this embodiment, the length of the oxygen lance outer tube 2 is determined according to the thickness of the furnace wall at the iron mouth of the blast furnace, and it enters the furnace and extends out of the iron mouth by 1500 mm. The gap between the iron mouth channel and the oxygen lance outer tube 2 is filled with mud sleeve material, and the gap between the oxygen lance outer tube 2 and the oxygen lance inner tube 1 is filled with iron groove casting material 5. The iron mouth mud bag is tightly covered, and the compressed air pipeline 17 and the oxygen pipeline 18 leak out. The compressed air pipeline 17 and the oxygen pipeline 18 are both connected to the high-pressure hose 10, and the compressed air valve 19 and the oxygen valve 20 are respectively connected to the compressed air pipeline 17 and the oxygen pipeline 18. Air 8 and oxygen 9 enter through compressed air pipeline 17 and oxygen pipeline 18 respectively; 1MPa pressure gauge is installed on short tube 24, tuyere sight glass 11 is connected to the rear end of oxygen gun inner tube 1, copper tube 13 is installed at 500mm inside the front end of oxygen gun inner tube 1 entering the furnace, 0-1200℃ K-type thermocouple 4 is installed between oxygen gun outer tube 2 and oxygen gun inner tube 1, digital display 12 is connected to 0-1200℃ K-type thermocouple 4, anti-deviation bracket 3 is welded on oxygen gun inner tube 1 to ensure that oxygen gun inner tube 1 is in the middle of oxygen gun outer tube 2. After oxygen and compressed air are mixed and enter the furnace, when the amount of oxygen is too large, it burns to the position of copper tube 13, which plays a flame retardant role. Secondly, tuyere sight glass 11 can observe the internal situation of the furnace. Close ball valve 7 before iron is tapped and remove tuyere sight glass 11.

[0029] The utility model is installed at the iron mouth position, inserted into the furnace from the iron mouth, the gap between the oxygen gun outer tube 2 and the iron mouth channel is filled with mud sleeve material, and the part entering the furnace is wrapped with mud to prevent burning; the oxygen pipeline 18 and the compressed air pipeline 17 are connected with a high-pressure hose 10 outside the furnace, and a small amount of oxygen and compressed air are introduced before air supply. The compressed air is used to prevent the oxygen gun from burning, and oxygen is gradually added in combination with the blast furnace wind pressure and air volume and the blast furnace unloading amount; according to the temperature displayed by the K-type thermocouple 4 inside the oxygen gun and the pressure gauge display, the iron tapping is determined. When the temperature of the K-type thermocouple reaches 400°C, or the pointer of the pressure gauge 6 vibrates, the oxygen gun ball valve 7 is closed, the air port sight glass 11 is removed, and the oxygen amount is continuously increased to reduce the compressed air amount entering the blast furnace; when the temperature of the K-type thermocouple reaches 700°C, or the vibration force of the pressure gauge is large, the iron tapping condition is met, the compressed air valve 19 is closed, the ball valve 7 is opened, the oxygen valve 20 is closed, and the slag iron flows out along the oxygen gun. The utility model plays the role of quickly heating the furnace cylinder, preventing the oxygen lance from burning the iron mouth refractory and cooling equipment, changing the difficulty of first iron tapping during the recovery period of opening the furnace and supplying air after the blast furnace is stuffy, and solving the problem of easy burning of the iron mouth refractory and cooling equipment.

Claims

1. A taphole oxygen lance device, characterized in that: The oxygen lance comprises an inner tube (1), an outer tube (2), an anti-deviation bracket (3), a K-type thermocouple (4), a pressure gauge (6), an air inlet sight glass (11), a digital display (12) and a copper tube (13). The inner tube (1) of the oxygen lance comprises a pipe section 1 (14), a pipe section 2 (15) and a pipe section 3 (16) which are connected in sequence. The pipe section 1 (14), the pipe section 2 (15) and the pipe section 3 (16) are integrally formed. The pipe section 2 (15) is arranged inside the outer tube (2) of the oxygen lance, and the pipe section 1 (14) and the pipe section 3 (16) extend out of the outer tube (2) of the oxygen lance. A plurality of copper tubes (13) are arranged inside the front end of the pipe section 2 (15). A plurality of anti-deviation brackets (3) are welded on the outer surface of the second pipe section (15); a gap is provided between the second pipe section (15) and the oxygen lance outer tube (2), and the gap is filled with iron ditch casting material (5); the front end of a K-type thermocouple (4) is arranged in the gap, and the rear end extends out of the oxygen lance outer tube (2) and is connected to a digital display instrument (12); the front end of the third pipe section (16) is connected to a pressure gauge (6), and the middle part is connected to a compressed air pipeline (17) and an oxygen pipeline (18) through a high-pressure rubber hose (10); a tuyere sight glass (11) is provided at the rear end, and compressed air (8) and oxygen (9) are introduced into the compressed air pipeline (17) and the oxygen pipeline (18), respectively.

2. A taphole oxygen lance device according to claim 1, characterized in that: The high-pressure rubber hose (10) comprises a main line (21), a branch line 1 (22) and a branch line 2 (23). One end of the main line (21) is connected to the pipe section 3 (16), and the other end is divided into two branches, namely, branch line 1 (22) and branch line 2 (23). Branch line 1 (22) and branch line 2 (23) are respectively connected to the compressed air pipeline (17) and the oxygen pipeline (18).

3. A taphole oxygen lance device according to claim 2, characterized in that: A ball valve (7) is provided on the pipe section three (16) between the high-pressure rubber hose (10) and the air vent sight glass (11), a compressed air valve (19) is provided between the branch line one (22) and the compressed air pipeline (17), and an oxygen valve (20) is provided between the branch line two (23) and the oxygen pipeline (18).

4. A taphole oxygen lance device according to claim 1 or 2, characterized in that: The front end of the pipe section three (16) is connected to the pressure gauge (6) via a short pipe (24).

5. A taphole oxygen lance device according to claim 1 or 2, characterized in that: The K-type thermocouple (4) has a temperature measurement range of 0-1200° C. and a length of 5 m.

6. A taphole oxygen lance device according to claim 1 or 2, characterized in that: The gap between the pipe section 1 (14) of the oxygen lance inner pipe (1) and the iron mouth channel is filled with mud sheath material.

Images