A natural gas spray gun for copper smelting top-blown melting furnace

Abstract

The present invention relates to a natural gas spray gun for a copper smelting top-blown melting furnace, comprising a gun body and a gas pipe, the gas pipe is coaxially installed in the gun body, the gun body comprises an end mounting tube, a diffusion tube and a middle connecting tube, an air interface is arranged at the rear end of the end mounting tube, the front end of the end mounting tube is connected to the diffusion tube, the front end of the diffusion tube is connected to the middle connecting tube, a burn control end is arranged at the front end of the middle connecting tube, a gas joint is arranged at the rear end of the gas pipe, a gas source connection hole is arranged on the end mounting tube corresponding to the gas joint, and a cyclone is arranged between the middle connecting tube and the gas pipe. The present invention realizes the use of natural gas as a heating and heat preservation fuel for an Isa furnace, and can improve the combustion efficiency of natural gas, supplement the necessary heat for the copper smelting process, and take into account the accurate measurement of the pressure at the end of the spray gun. Using clean energy can reduce costs while avoiding the generation of toxic and harmful gases such as nitrogen oxides, improving the flue gas conditions during the oil burning of the Isa furnace, and ensuring the smooth operation of the sulfuric acid process.

Description

Technical Field

[0001] The invention relates to the technical field of copper smelting, and in particular to a natural gas spray gun used in a top-blown smelting furnace for copper smelting. Background Art

[0002] At present, during the daily production and shutdown of the Isa furnace of Yunnan Central Company, 0# diesel is used as a heating and insulation fuel. Due to the high market price of diesel, the use of diesel is not conducive to production cost control. In addition, when the fuel is supplied to the Isa spray gun, it is sprayed onto the inner wall of the barrel under the action of the cyclone, causing burn damage to the spray gun, shortening the life of the spray gun and reducing the operation rate of the Isa furnace. Secondly, diesel, as a complex hydrocarbon mixture, contains sulfide ester additives, which produce toxic and harmful gases such as nitrogen oxides during the combustion process, affecting the stable operation of sulfuric acid equipment. At the same time, it has an adverse effect on the company's environmental protection production and the occupational health of employees.

[0003] Natural gas is a relatively cheap clean energy. Its application in Isa furnace smelting can further reduce production costs, effectively reduce pollution sources, and promote the harmonious development of enterprises. Therefore, it is very necessary to carry out research and development on the use of natural gas in Isa furnaces. Summary of the invention

[0004] In order to overcome the problems existing in the background technology, the present invention provides a natural gas spray gun for a copper smelting top-blown melting furnace, which can effectively use natural gas as a temperature raising and heat preservation fuel for an Isa furnace, and can improve the natural gas combustion efficiency, and supplement the necessary heat for the copper smelting process. At the same time, the accurate measurement of the pressure at the end of the spray gun is taken into account.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the natural gas spray gun for a copper smelting top-blown smelting furnace comprises a gun body and a gas pipe, the gas pipe is coaxially installed in the gun body, the gun body comprises an end mounting tube, a diffusion tube and a middle connecting tube, an air interface is arranged at the rear end of the end mounting tube, the front end of the end mounting tube is connected to the diffusion tube, the front end of the diffusion tube is connected to the middle connecting tube, a burn control end is arranged at the front end of the middle connecting tube, the front end of the gas pipe extends to the inside of the rear end of the burn control end, a gas joint is arranged on the rear end of the gas pipe, a gas source connection hole is arranged on the end mounting tube corresponding to the gas joint, and a swirler is arranged between the middle connecting tube and the gas pipe.

[0006] Preferably, an end pressure tube is provided on the coaxial sleeve on the outer side of the gas pipe, and the end pressure tube is fixed to the inner wall of the gun body through a support block, and the outer wall of the gas pipe and the inner wall of the end pressure tube are connected by a support tube; it also includes an end pressure cap, which includes an end pressure cap interface, a gas pipe sleeve hole and an end pressure taking hole. The end pressure cap is installed on the front end of the end pressure tube through the end pressure cap interface, and the front end of the gas pipe extends to the outside through the gas pipe sleeve hole. The end pressure taking hole is arranged on the side wall of the end pressure cap, and the end pressure taking hole is obliquely connected from the outer wall of the end pressure cap to the inner cavity at the front end of the end pressure cap interface. A pressure taking port is arranged on the rear end of the end pressure tube, and a pressure taking tube is arranged on the gun body corresponding to the pressure taking port, and the pressure taking tube is connected to the pressure taking port.

[0007] Preferably, the gas connector includes a gas interface and a gas connecting port, the gas interface is vertically arranged at the top of the gas connector, the position of the gas interface corresponds to the gas source connection hole, the gas connecting port is horizontally arranged at the left end of the gas connector, the gas connecting port is connected to the gas interface through the gas turning inner cavity, the gas connecting port is connected to the rear end of the gas pipe, and the rear end of the end pressure tube is sleeved on the outer wall of the gas connecting port.

[0008] Preferably, a conical end is provided at the right end of the gas connector.

[0009] Preferably, a gas transition connector is further included, wherein an inverted cone-shaped inner hole is arranged in the gas transition connector, the outer shape of the gas transition connector is arranged in a stepped shape, an upper gas source joint is arranged at the upper part of the gas transition connector, and a lower gas source joint is arranged at the lower part of the gas transition connector, and the lower gas source joint is connected to the gas interface.

[0010] Preferably, the cyclone comprises swirl blades and a mounting sleeve, wherein the mounting sleeve is arranged in the middle of the cyclone and the swirl blade array is arranged around the mounting sleeve.

[0011] Preferably, the swirl blade is a variable pitch spiral with a left-hand rotation direction, an inlet angle of 0° and an outlet angle of 45°.

[0012] Preferably, a trumpet-shaped nozzle is provided at the front end of the gas pipe.

[0013] Preferably, a spray gun mounting bracket is provided on the gun body.

[0014] Beneficial effects of the present invention:

[0015] The present invention can effectively use natural gas as a fuel for heating and heat preservation of the Isa furnace, and can improve the combustion efficiency of natural gas, and supplement the necessary heat for the copper smelting process. At the same time, it takes into account the accurate measurement of the pressure at the end of the spray gun. Introducing clean energy into the copper smelting of the Isa furnace can reduce costs while avoiding the generation of toxic and harmful gases such as nitrogen oxides, improve the flue gas conditions during the oil burning of the Isa furnace, and ensure the smooth operation of the sulfuric acid process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall internal structure coordination of the present invention;

[0018] Figure 3 It is a schematic diagram of the appearance structure of the gun body of the present invention;

[0019] Figure 4 It is a schematic diagram of the internal structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the end pressure tube structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the gas pipe of the present invention;

[0022] Figure 7 It is a schematic diagram of the end pressure cap structure of the present invention;

[0023] Figure 8 for Figure 7 Left view of;

[0024] Fig. 9 It is a schematic diagram of the coordination of the end pressure cap, the end pressure pipe and the gas pipe of the present invention;

[0025] Fig.10 It is a schematic diagram of the gas connector of the present invention;

[0026] Fig.11 It is an enlarged view of part A of the present invention;

[0027] Fig.12 It is a schematic diagram of the structure of the gas transition connector of the present invention;

[0028] Fig.13 It is a schematic diagram of the structure of the cyclone of the present invention;

[0029] Fig.14 for Fig.13 Left view of;

[0030] The reference numerals in the figure are: gun body 1; end mounting tube 2; diffusion tube 3; middle connecting tube 4; burn control end 5; air interface 6; gas connector 7; end pressure tube 8; gas pipe 9; swirler 10; end pressure cap 11; support block 12; gas source connection hole 13; pressure taking tube 14; spray gun mounting frame 15; mounting sleeve 16; end pressure cap interface 17; gas pipe sleeve hole 18; end pressure taking hole 19; support tube 20; trumpet-shaped nozzle 21; pressure taking port 22; gas connecting port 23; gas interface 24; gas turning inner cavity 25; gas transition connector 26; inverted cone inner hole 27; gas source upper joint 28; swirl blade 29; conical end 30. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and beneficial effects of the present invention more clear, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding by technicians.

[0032] Please combine Figures 1 to 14 For reference, the natural gas spray gun for copper smelting top-blown melting furnace comprises a gun body 1 and a gas pipe 9, the gas pipe 9 is coaxially installed in the gun body 1, the gun body 1 comprises an end mounting pipe 2, a diffusion pipe 3 and a middle connecting pipe 4, an air interface 6 is arranged at the rear end of the end mounting pipe 1, the front end of the end mounting pipe 2 is connected to the diffusion pipe 3, the front end of the diffusion pipe 3 is connected to the middle connecting pipe 4, the front end of the middle connecting pipe 4 is arranged with a burn control end 5, the front end of the gas pipe 9 extends to the rear end of the burn control end 5, a gas connector 7 is arranged on the rear end of the gas pipe 9, a gas source connection hole 13 is arranged on the end mounting pipe 1 corresponding to the gas connector 7, and a cyclone 10 is arranged between the middle connecting pipe 4 and the gas pipe 9. Among them, the air interface 6 is used to connect the oxygen-enriched air source to provide oxygen-enriched air for the gun body 1. The inner wall of the diffusion pipe 3 is trumpet-shaped, and the oxygen-enriched air is diffused into the middle connecting pipe 4 to provide sufficient air volume for the cyclone 10. The burn control end 5 is used to insert the slag layer and bear the burn of the gun body 1. After the burn control end 5 is burned to a certain length, it needs to be repaired and replaced. The gas source connection hole 13 is used to insert the natural gas source hose, so that the natural gas source hose can be connected to the gas connector 7 to provide natural gas for the gas pipe 9. When working, the cyclone 10 injects oxygen-enriched air into the furnace and stirs the molten pool. At the same time, the natural gas supplied by the gas pipe 9 is fully burned to supplement the necessary heat for the copper smelting process and effectively improve the natural gas combustion efficiency. In this example, the gun body 1 and the gas pipe 9 are both made of stainless steel. The total length of the gas pipe is 15736 mm to 15886 mm, and the diameter is ∅70 / ∅62.

[0033] Furthermore, an end pressure tube 8 is coaxially sleeved on the outer side of the gas pipe 9, and the end pressure tube 8 is fixed to the inner wall of the gun body 1 through a support block 12, and the outer wall of the gas pipe 9 is connected to the inner wall of the end pressure tube 8 through a support tube 20; it also includes an end pressure cap 11, and the end pressure cap 11 includes an end pressure cap interface 17, a gas pipe sleeve hole 18 and an end pressure taking hole 19. The end pressure cap 11 is installed at the front end of the end pressure tube 8 through the end pressure cap interface 17, and the front end of the gas pipe 9 extends to the outside through the gas pipe sleeve hole 18. The end pressure taking hole 19 is arranged on the side wall of the end pressure cap 11, and the end pressure taking hole 19 is obliquely connected from the outer wall of the end pressure cap 11 to the inner cavity at the front end of the end pressure cap interface 17. A pressure taking port 22 is arranged on the rear end of the end pressure tube 8, and a pressure taking pipe 14 is arranged on the gun body 1 corresponding to the pressure taking port 22, and the pressure taking pipe 14 is connected to the pressure taking port 22. Among them, the end pressure pipe 8 is made of 20# carbon steel pipe, with a total length of 15576 mm to 15726 mm and a diameter of ∅95 / ∅87. The support block 12 is rectangular in shape and is made of 6 mm thick steel plate. The support pipe 20 is made of ∅6 round steel and welded between the outer wall of the gas pipe 9 and the inner wall of the end pressure pipe 8 to form a support. The end pressure cap 11 is a machined part made of round steel with cylindrical pipe threads, with a length of 95 mm and a diameter of ∅90 / ∅70. There are a total of 6 pressure holes 19 with a diameter of ∅6, and the angle between the pressure hole 19 and the axis of the end pressure cap 11 is 45°. The distance between the end pressure cap 11 and the front end of the gun body 1 is controlled within 600mm to 900mm. The pressure pipe 14 is used to connect to a remote pressure gauge. During operation, the gun body 1 and the gas pipe 9 continuously take in air and gas to form air pressure at the end of the gun body 1. The air pressure enters the cavity formed between the outer wall of the gas pipe 9 and the inner wall of the end pressure pipe 8 through the pressure hole 19, and then is transmitted to the remote pressure gauge through the pressure port 22 and the pressure pipe 14 for real-time monitoring, so as to achieve accurate measurement of the pressure at the end of the spray gun, which is used as an important basis for judging the working state of the spray gun and the blockage of the pressure hole 19. In addition, the support pipe 20 is kept parallel to the end pressure pipe 8 in the axial direction, so that the support pipe 20 is easy to circulate air, reduce air resistance and ensure the accuracy of pressure detection.

[0034] Further, the gas connector 7 includes a gas interface 24 and a gas connection port 23. The gas interface 24 is vertically arranged at the top of the gas connector 7. The position of the gas interface 24 corresponds to the gas source connection hole 13. The gas connection port 23 is horizontally arranged at the left end of the gas connector 7. The gas connection port 23 is connected to the gas interface 24 through the gas turning inner cavity 25. The gas connection port 23 is connected to the rear end of the gas pipe 9. The gas interface 24 is used to access natural gas. The natural gas is sent to the gas pipe 9 through the gas turning inner cavity 25 and the gas connection port 23, so that the natural gas is transported from the vertical direction to the horizontal direction. In addition, a conical end 30 is provided at the right end of the gas connector 7 to reduce the resistance of the oxygen-rich air introduced into the rear end of the gun body 1. In addition, the rear end of the end pressure pipe 8 is welded to the outer wall of the gas connection port 23, and the front end of the end pressure pipe 8 is connected to the end pressure cap interface 17 of the end pressure cap 11 by threads. The rear end of the gas pipe 9 is connected to the gas connection port 23 by threads. Ensure that the connection structure is stable and reliable, has good airtightness and is easy to disassemble, so that the gas delivery and end pressure detection are closely combined and remain independent.

[0035] Furthermore, the present invention also includes a gas transition connector 26, in which an inverted conical inner hole 27 is arranged, the gas transition connector 26 is arranged in a stepped shape, a gas source upper joint 28 is arranged at the upper part of the gas transition connector 26, and a gas source lower joint 29 is arranged at the lower part of the gas transition connector 26, and the gas source lower joint 29 is connected to the gas interface 24. The middle part of the gas transition connector 26 is welded to the gas source connection hole 13, the upper gas source upper joint 28 is threadedly connected to the metal hose of the natural gas source, and the gas source lower joint 29 at the bottom is threadedly connected to the gas interface 24. Among them, the inverted conical inner hole 27 realizes the contraction and acceleration of the supplied natural gas, so that the natural gas can easily enter the gas pipe 9.

[0036] Furthermore, the cyclone 10 includes swirl blades 29 and a mounting sleeve 16, wherein the mounting sleeve 16 is arranged in the middle of the cyclone 10, and the swirl blades 29 array is arranged around the mounting sleeve 16. The cyclone 10 is connected to the outer wall of the end pressure pipe 8 through the mounting sleeve 16. Among them, the swirl blades 29 are variable pitch spirals, the rotation direction is left-handed, the inlet angle is 0°, and the outlet angle is 45°. It can generate swirl for the oxygen-enriched air and fully mix it with the natural gas, and play the role of stirring the molten pool to ensure the full combustion of the natural gas. In addition, a trumpet-shaped nozzle 21 is provided at the front end of the gas pipe 9, which can diffuse and send the natural gas at the outlet, ensure that the open gas is evenly sprayed and fully mixed with the oxygen-enriched air, and further improve the combustion efficiency of the natural gas.

[0037] Furthermore, a spray gun mounting bracket 15 is provided on the gun body 1, and the gun body 1 as a whole is actually mounted on the Isa furnace through the spray gun mounting bracket 15, so that installation and fixation can be easily realized.

[0038] The present invention can effectively use natural gas as a fuel for heating and heat preservation of the Isa furnace, and can improve the combustion efficiency of natural gas, and supplement the necessary heat for the copper smelting process. At the same time, it takes into account the accurate measurement of the pressure at the end of the spray gun. Introducing clean energy into the copper smelting of the Isa furnace can reduce costs while avoiding the generation of toxic and harmful gases such as nitrogen oxides, improve the flue gas conditions during the oil burning of the Isa furnace, and ensure the smooth operation of the sulfuric acid process.

[0039] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A natural gas spray gun for a top-blown copper smelting furnace, characterized in that: The invention comprises a gun body (1) and a gas pipe (9), wherein the gas pipe (9) is coaxially mounted in the gun body (1), the gun body (1) comprises an end mounting pipe (2), a diffusion pipe (3) and a middle connecting pipe (4), an air interface (6) is arranged at the rear end of the end mounting pipe (1), the front end of the end mounting pipe (2) is connected to the diffusion pipe (3), the front end of the diffusion pipe (3) is connected to the middle connecting pipe (4), a burnout control end (5) is arranged at the front end of the middle connecting pipe (4), the front end of the gas pipe (9) extends to the inside of the rear end of the burnout control end (5), a gas connector (7) is arranged at the rear end of the gas pipe (9), a gas source connection hole (13) is arranged on the end mounting pipe (1) corresponding to the gas connector (7), and a swirler (10) is arranged between the middle connecting pipe (4) and the gas pipe (9); A terminal pressure tube (8) is coaxially sleeved on the outer side of the gas pipe (9), and the terminal pressure tube (8) is fixed to the inner wall of the gun body (1) through a support block (12); The invention also comprises an end pressure cap (11), the end pressure cap (11) comprising an end pressure cap interface (17), a gas pipe sleeve hole (18) and an end pressure tapping hole (19); the end pressure cap (11) is installed at the front end of the end pressure pipe (8) through the end pressure cap interface (17); the front end of the gas pipe (9) extends outward through the gas pipe sleeve hole (18); the end pressure tapping hole (19) is arranged on the side wall of the end pressure cap (11); the end pressure tapping hole (19) is connected obliquely from the outer wall of the end pressure cap (11) to the inner cavity at the front end of the end pressure cap interface (17); a pressure tapping port (22) is arranged on the rear end of the end pressure pipe (8); a pressure tapping pipe (14) is arranged on the gun body (1) corresponding to the pressure tapping port (22); the pressure tapping pipe (14) is connected to the pressure tapping port (22).

2. The natural gas lance for a top-blown copper smelting furnace according to claim 1, characterized in that: The outer wall of the gas pipe (9) and the inner wall of the end pressure pipe (8) are connected via a support pipe (20); The support tube (20) is arranged between the end pressure taking hole (19) and the pressure taking tube (14), and the support tube (20) is axially kept parallel to the end pressure tube (8).

3. The natural gas lance for a top-blown copper smelting furnace according to claim 1 or 2, characterized in that: The gas connector (7) comprises a gas interface (24) and a gas connecting port (23). The gas interface (24) is vertically arranged at the top of the gas connector (7). The position of the gas interface (24) corresponds to the gas source connection hole (13). The gas connecting port (23) is horizontally arranged at the left end of the gas connector (7). The gas connecting port (23) is connected to the gas interface (24) through a gas turning inner cavity (25). The gas connecting port (23) is connected to the rear end of the gas pipe (9). The rear end of the end pressure pipe (8) is sleeved on the outer wall of the gas connecting port (23).

4. The natural gas lance for a top-blown copper smelting furnace according to claim 3, characterized in that: The right end of the gas connector (7) is configured as a conical end (30).

5. The natural gas lance for a top-blown copper smelting furnace according to claim 1, 2 or 4, characterized in that: The invention also comprises a gas transition connector (26), wherein an inverted conical inner hole (27) is arranged in the gas transition connector (26), the outer shape of the gas transition connector (26) is arranged in a stepped shape, an upper gas source joint (28) is arranged at the upper part of the gas transition connector (26), and a lower gas source joint (29) is arranged at the lower part of the gas transition connector (26), and the lower gas source joint (29) is connected to the gas interface (24).

6. The natural gas lance for a top-blown copper smelting furnace according to claim 1, 2, 4 or 5, characterized in that: The cyclone (10) comprises swirl blades (29) and a mounting sleeve (16). The mounting sleeve (16) is arranged in the middle of the cyclone (10), and an array of swirl blades (29) is arranged around the mounting sleeve (16).

7. The natural gas lance for a top-blown copper smelting furnace according to claim 6, characterized in that: The swirl blade (29) is a variable pitch spiral with a left-handed rotation direction, an inlet angle of 0°, and an outlet angle of 45°.

8. The natural gas lance for a top-blown copper smelting furnace according to claim 1, 2, 4 or 7, characterized in that: A trumpet-shaped nozzle (21) is arranged at the front end of the gas pipe (9).

9. The natural gas lance for a top-blown copper smelting furnace according to claim 8, characterized in that: A spray gun mounting frame (15) is arranged on the gun body (1).

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