A swirling immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace

Abstract

The utility model discloses a swirl immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace, comprising a spray gun body, an oil-gas mixing tube arranged in the spray gun body, and further comprising: a Laval tube structure mixing unit arranged inside the spray gun body, used for accelerating the mixing of the oil and gas entering the spray gun body; a swirl unit, comprising an internal thread swirl groove arranged in the spray gun body and located at the discharge end of the Laval tube structure mixing unit for increasing the oil and gas range. By arranging the oil inlet pipe, the air inlet pipe, and the oil-gas mixing tube in a Y-shaped layout, it is ensured that the nitrogen and the liquid fuel collide when they flow into the oil-gas mixing tube to complete the preliminary mixing work, and then the oil-gas mixture after the preliminary mixing is further pressurized and collided at the contraction section, and the oil and gas flow at a high speed in the pressure stabilizing section with a smaller aperture than the oil-gas mixing tube, and then stably released at the expansion section, further improving the mixing effect between the liquid fuel and the gas, so that the fuel burns more fully.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to a swirl immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace. Background Art

[0002] The use of lean coal or low calorific value fuels has become a common phenomenon in industrial production processes. However, due to the uneven composition of these fuels and the instability of their combustion characteristics, traditional combustion equipment often faces many challenges when handling these fuels. Lean furnace is a common combustion equipment used to handle lean coal or low calorific value fuels such as biomass, coke waste, etc. Its main function is to convert these fuels into thermal energy for heating or other industrial production processes.

[0003] However, in a depleted electric furnace, the uneven composition of the fuel and the possible uneven gas flow during the combustion process often lead to problems such as low combustion efficiency, low thermal energy utilization and increased emissions. Especially in the traditional spray gun structure, a single nozzle design is usually adopted, and the mixing effect of fuel and nitrogen is poor, resulting in incomplete combustion and serious energy waste. In addition, the low fuel flow rate leads to unstable combustion, which affects production efficiency and equipment life.

[0004] Therefore, there is an urgent need for a new type of spray gun structure that can effectively improve the combustion characteristics of lean coal or low calorific value fuels and improve combustion efficiency and stability. For the optimization of the lean electric furnace spray gun, many factors need to be considered, including the mixing efficiency of fuel and nitrogen, flow rate increase, combustion stability, equipment durability, etc. Therefore, through the optimization design of the spray gun structure and working principle, a more efficient, stable and environmentally friendly combustion process can be achieved, thereby improving the energy utilization and economic benefits of industrial production.

[0005] The utility model relates to an optimized structure of a lean electric furnace spray gun, aiming to solve the problems of low fuel mixing efficiency, insufficient flow rate and unstable combustion existing in traditional spray guns, and to provide a more effective solution for the combustion of lean coal or low calorific value fuel. Utility Model Content

[0006] The purpose of the utility model is to provide a swirl immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace, so as to solve the problem that the existing depletion furnace spray gun proposed in the above background technology usually adopts a single nozzle design, the mixing effect of fuel and nitrogen is poor, resulting in incomplete combustion and serious energy waste. In addition, due to the low fuel flow rate, the combustion is unstable, which affects the production efficiency and equipment life.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A cyclone immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace comprises a spray gun body, an oil-gas mixing pipe is arranged in the spray gun body, and further comprises:

[0009] A Laval tube structure mixing unit is arranged inside the spray gun body and is used to accelerate the mixing of oil and gas entering the spray gun body;

[0010] The swirl unit comprises an internal thread swirl groove which is arranged in the spray gun body and located at the discharge end of the Laval tube structure mixing unit and is used to increase the oil and gas range.

[0011] Furthermore, the feed end of the spray gun body is provided with an air inlet pipe for feeding nitrogen into the mixing tube and an oil inlet pipe for feeding liquid fuel into the mixing tube;

[0012] The air inlet pipe, the oil inlet pipe and the spray gun body are arranged in a Y shape, so that the liquid fuel and the gas collide when entering the oil-gas mixing pipe.

[0013] Further, the Laval tube structure mixing unit comprises:

[0014] An embedded block is fixedly inserted in the oil-gas mixing pipe, and a contraction section, a pressure stabilizing section, and an expansion section are sequentially arranged inside the embedded block along the oil-gas conveying direction, and the contraction section, the pressure stabilizing section, and the expansion section are used to increase the pressure inside the gun to increase the flow rate of the mixed fluid;

[0015] The total length L1 of the Laval tube structure mixing unit ranges from 500mm to 2000mm, the length L3 of the pressure stabilizing section ranges from 100mm to 250mm, and the sum of the lengths L2 of the contraction section, the pressure stabilizing section, and the expansion section ranges from 150mm to 400mm.

[0016] Furthermore, the pitch of the internal thread swirl groove gradually decreases along the conveying direction of the liquid fuel and the gas;

[0017] The length L4 of the cyclone unit ranges from 1000 mm to 5000 mm;

[0018] The pitch of the internal thread swirl groove is arranged in a geometric series, the inner diameter φ of the oil-gas mixing tube is 16-40mm, and the thread depth range is 1.5mm-4.0mm, which is used to change the swirl effect of the fluid and enhance the mixing effect of the gas-liquid two phases in the fluid.

[0019] Furthermore, an isolation sleeve for heat insulating the spray gun body is provided on the outside of the spray gun body and on the fixed sleeve outside the nozzle of the oil-gas mixing pipe;

[0020] The end length L5 of the spray gun body ranges from 600 mm to 2000 mm.

[0021] Furthermore, a first connecting portion is provided inside the spray gun body and between the air inlet pipe and the Laval tube structure mixing unit;

[0022] A second connecting portion is provided inside the spray gun body and between the Laval tube structure mixing unit and the swirl unit;

[0023] A third connecting portion is provided inside the spray gun body and between the swirl unit and the outlet of the oil-gas mixing pipe;

[0024] The first connection part, the second connection part and the third connection part are all connected by threaded connection.

[0025] The nitrogen gas is introduced for stirring to make the reaction more complete.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] 1. The utility model inputs liquid fuel from an oil inlet pipe into an oil-gas mixing pipe, and at the same time, inputs nitrogen from an air inlet pipe into the oil-gas mixing pipe. By arranging the oil inlet pipe, the air inlet pipe and the oil-gas mixing pipe in a Y shape, it is ensured that the nitrogen and the liquid fuel collide when they flow into the oil-gas mixing pipe, thereby completing a preliminary mixing work. Subsequently, the oil-gas mixture after the preliminary mixing is further pressurized and collided at a contraction section, and the oil and gas flow at a high speed in a pressure stabilizing section whose aperture is smaller than that of the oil-gas mixing pipe, and then stably released at an expansion section, thereby further improving the mixing effect between the liquid fuel and the gas, and making the fuel burn more fully.

[0028] 2. The utility model increases the flow rate of liquid fuel and gas in the pressure stabilizing section and releases them in the expansion section, and then the mixed oil and gas enter the internal thread swirl groove. By gradually decreasing the pitch of the internal thread swirl groove, the mixed oil and gas rotates in the internal thread swirl groove to form multiple streams and then spray out of the nozzle, so that the diffusion range of the mixed oil and gas after being sprayed into the depletion furnace is further expanded, and it is stirred and mixed with the slag layer in the depletion furnace, thereby promoting the chemical reaction of the metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0030] Figure 2 For the utility model Figure 1 The enlarged view of point A in the middle;

[0031] Figure 3 This is a distribution diagram of the internal thread swirl grooves of the utility model inside the oil-gas mixing pipe.

[0032] Figure numerals: 100, spray gun body; 101, air inlet pipe; 102, oil inlet pipe; 103, isolation sleeve; 104, oil-gas mixing pipe; 105, first connecting part; 106, second connecting part; 107, third connecting part; 1, Laval tube structure mixing unit; 11, embedded block; 12, contraction section; 13, pressure stabilizing section; 14, expansion section; 2, swirl unit; 21, internal thread swirl groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figure 1-3 , the utility model provides a technical solution:

[0035] A cyclone immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace comprises a spray gun body 100, wherein an oil-gas mixing pipe 104 is provided in the spray gun body 100, and further comprises:

[0036] The Laval tube structure mixing unit 1 is arranged inside the spray gun body 100 and is used to accelerate the mixing of oil and gas entering the spray gun body 100;

[0037] The swirl unit 2 includes an internal thread swirl groove 21 which is arranged in the spray gun body 100 and located at the discharge end of the Laval tube structure mixing unit 1 for increasing the oil and gas range.

[0038] As an improvement, Figure 1 As shown, the feed end of the spray gun body 100 is provided with an air inlet pipe 101 for feeding nitrogen into the mixing pipe and an oil inlet pipe 102 for feeding liquid fuel into the mixing pipe;

[0039] The air inlet pipe 101 , the oil inlet pipe 102 and the spray gun body 100 are arranged in a Y shape, so that the liquid fuel and the gas collide when entering the oil-gas mixing pipe 104 .

[0040] Further, such as Figure 1-2 As shown, the Laval tube structure mixing unit 1 comprises:

[0041] The embedded block 11 is fixedly inserted in the oil-gas mixing pipe 104. The inside of the embedded block 11 is provided with a contraction section 12, a pressure stabilizing section 13, and an expansion section 14 in sequence along the oil-gas delivery direction. The contraction section 12, the pressure stabilizing section 13, and the expansion section 14 are used to increase the pressure in the gun to increase the flow rate of the mixed fluid.

[0042] The total length L1 of the Laval tube structure mixing unit 1 ranges from 500mm to 2000mm, the length L3 of the pressure stabilizing section 13 ranges from 100mm to 250mm, and the sum of the lengths L2 of the contraction section 12, the pressure stabilizing section 13, and the expansion section 14 ranges from 150mm to 400mm.

[0043] Furthermore, if Figure 1 , Figure 3 As shown, the pitch of the internal thread swirl groove 21 gradually decreases along the conveying direction of the liquid fuel and the gas;

[0044] The length L4 of the cyclone unit 2 is in the range of 1000mm-5000mm;

[0045] The pitch of the internal thread swirl groove 21 is arranged in a geometric series, the inner diameter φ of the oil-gas mixing tube 104 is 16-40mm, and the thread depth range is 1.5mm-4.0mm, which is used to change the swirl effect of the fluid and enhance the mixing effect of the gas-liquid two phases in the fluid.

[0046] Wherein, an isolation sleeve 103 for heat insulation of the spray gun body 100 is provided on the outside of the spray gun body 100 and on the outside of the nozzle of the oil-gas mixing pipe 104;

[0047] The end length L5 of the spray gun body 100 ranges from 600 mm to 2000 mm.

[0048] The material of the isolation sleeve 103 has high temperature wear resistance and corrosion resistance, and the material of the isolation sleeve 103 is a magnesium-chromium casting material.

[0049] With this design, when the spray gun body 100 is installed in the depletion furnace, the nozzle of the spray gun body 100 is immersed in the depletion furnace. The protection of the nozzle by the isolation sleeve 103 effectively prevents the nozzle of the spray gun body 100 located in the depletion furnace from being melted or corroded, thereby extending the service life of the spray gun body 100.

[0050] In addition, if Figure 1 As shown, a first connecting portion 105 is provided inside the spray gun body 100 and between the air inlet pipe 101 and the Laval tube structure mixing unit 1;

[0051] A second connecting portion 106 is provided inside the spray gun body 100 and between the Laval tube structure mixing unit 1 and the cyclone unit 2;

[0052] A third connecting portion 107 is provided inside the spray gun body 100 and between the swirl unit 2 and the outlet of the oil-gas mixing pipe 104;

[0053] The first connection portion 105 , the second connection portion 106 , and the third connection portion 107 are all connected by threaded connection.

[0054] With this design, when the oil-gas mixing pipe 104 needs to be cleaned and maintained, the first connection part 105, the second connection part 106, and the third connection part 107 can be disassembled separately, and then the oil-gas mixing pipe 104 can be cleaned and maintained in sections, which makes it easier for staff to clean and maintain the oil-gas mixing pipe 104.

[0055] It should be noted that: in the specific implementation process of the utility model, Figure 1-2 As shown, liquid fuel is input from the oil inlet pipe 102 into the oil-gas mixing pipe 104, and at the same time, nitrogen is input from the air inlet pipe 101 into the oil-gas mixing pipe 104. By arranging the oil inlet pipe 102, the air inlet pipe 101, and the oil-gas mixing pipe 104 in a Y-shaped layout, it is ensured that the nitrogen and the liquid fuel collide when they flow into the oil-gas mixing pipe 104, completing the preliminary mixing work. Subsequently, the oil-gas mixture after the preliminary mixing is further pressurized and collided at the contraction section 12, and the oil and gas flow at a high speed in the pressure stabilizing section 13 with a smaller aperture than the oil-gas mixing pipe 104, and then stably released at the expansion section 14, further improving the mixing effect between the liquid fuel and the gas, so that the fuel burns more fully;

[0056] like Figure 1 , Figure 3 As shown, after the liquid fuel and gas increase their flow rate in the pressure stabilizing section 13 and are released in the expansion section 14, the mixed oil and gas enter the internal thread swirl groove 21. By gradually decreasing the pitch of the internal thread swirl groove 21, the mixed oil and gas rotate in the internal thread swirl groove 21 to form multiple streams and then spray out of the nozzle, so that the diffusion range of the mixed oil and gas after being sprayed into the depletion furnace is further expanded, and it is stirred and mixed with the slag layer in the depletion furnace, thereby promoting the chemical reaction of the metal.

[0057] In summary, in the utility model, since a Laval tube structure mixing unit 1 is provided in the spray gun body 100, the flow rate of the liquid fuel is accelerated, the mixing effect of the liquid fuel and nitrogen is promoted, and the fuel is ensured to be fully burned; in addition, an internal thread swirl groove 21 with a gradually decreasing pitch is provided inside the spray gun body 100 and at the discharge end of the Laval tube structure mixing unit 1, which increases the range of the fuel, makes the liquid fuel diffuse more widely in the depletion furnace, and improves the reduction rate of the magnetic iron in the depletion furnace.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cyclone immersion spray gun for an oxygen-enriched molten pool smelting copper slag depletion furnace, comprising a spray gun body (100), wherein an oil-gas mixing pipe (104) is provided in the spray gun body (100), characterized in that: Also includes: A Laval tube structure mixing unit (1), arranged inside the spray gun body (100), and used for accelerating the mixing of oil and gas entering the spray gun body (100); The swirl unit (2) comprises an internal thread swirl groove (21) which is arranged in the spray gun body (100) and located at the discharge end of the Laval tube structure mixing unit (1) and is used to increase the oil and gas range.

2. The swirling submerged spray gun for the oxygen-enriched molten pool copper slag depletion furnace according to claim 1, characterized in that: The feed end of the spray gun body (100) is provided with an air inlet pipe (101) for feeding nitrogen into the mixing pipe and an oil inlet pipe (102) for feeding liquid fuel into the mixing pipe; The air inlet pipe (101), the oil inlet pipe (102) and the spray gun body (100) are arranged in a Y shape, so that the liquid fuel and the gas collide when entering the oil-gas mixing pipe (104).

3. The swirling submerged spray gun for the oxygen-enriched molten pool copper slag depletion furnace according to claim 1, characterized in that: The Laval tube structure mixing unit (1) comprises: An embedded block (11) is fixedly inserted in the oil-gas mixing pipe (104); a contraction section (12), a pressure stabilizing section (13), and an expansion section (14) are sequentially arranged inside the embedded block (11) along the oil-gas conveying direction; the contraction section (12), the pressure stabilizing section (13), and the expansion section (14) are used to increase the pressure inside the gun, so as to increase the flow rate of the mixed fluid.

4. The swirling submerged spray gun for the oxygen-enriched molten pool copper slag depletion furnace according to claim 3, characterized in that: The total length L1 of the Laval tube structure mixing unit (1) ranges from 500 mm to 2000 mm, the length L3 of the pressure stabilizing section (13) ranges from 100 mm to 250 mm, and the total length L2 of the contraction section (12), the pressure stabilizing section (13), and the expansion section (14) ranges from 150 mm to 400 mm.

5. The swirling submerged spray gun for the oxygen-enriched molten pool copper slag depletion furnace according to claim 1, characterized in that: The pitch of the internal thread swirl groove (21) gradually decreases along the conveying direction of the liquid fuel and the gas; The length L4 of the cyclone unit (2) is in the range of 1000 mm to 5000 mm; The pitch of the internal thread swirl groove (21) is arranged in a geometric series, the inner diameter φ of the oil-gas mixing tube (104) is 16-40 mm, and the thread depth range is 1.5 mm-4.0 mm, which is used to change the swirl effect of the fluid and enhance the mixing effect of the gas-liquid two phases in the fluid.

6. The swirling submerged spray gun for the oxygen-enriched molten pool copper slag depletion furnace according to claim 1, characterized in that: An isolation sleeve (103) for heat insulating the spray gun body (100) is provided on the outside of the spray gun body (100) and on the outside of the nozzle of the oil-gas mixing pipe (104); The end length L5 of the spray gun body (100) ranges from 600 mm to 2000 mm.

7. The swirling submerged spray gun for the oxygen-enriched molten pool copper slag depletion furnace according to claim 2, characterized in that: A first connecting portion (105) is provided inside the spray gun body (100) and between the air inlet pipe (101) and the Laval tube structure mixing unit (1); A second connecting portion (106) is provided inside the spray gun body (100) and between the Laval tube structure mixing unit (1) and the swirl unit (2); A third connecting portion (107) is provided inside the spray gun body (100) and between the swirl unit (2) and the outlet of the oil-gas mixing pipe (104); The first connection part (105), the second connection part (106) and the third connection part (107) are all connected by threaded connection.

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