Internal mixing double-medium evaporation cold spray gun special for steel mill converter

Abstract

The invention discloses an internal mixing double-medium evaporation cold spray gun special for a steel mill converter, and belongs to the technical field of metallurgical equipment. An inner mixing double-medium evaporation cold spray gun special for a steel mill converter comprises a first pipeline and a spray gun head at the output end of a second pipeline, the spray gun head comprises a spray gun core and a spray gun nozzle, the spray gun core comprises a deepening head extending into the spray gun nozzle and a diffusion channel surrounding the deepening head, and the deepening head is communicated with the second pipeline. The diffusion channel is communicated with the first pipeline; the spray gun further comprises a taper sleeve atomization piece arranged on the deepening head in a sleeving mode, the taper sleeve atomization piece and the deepening head are in clearance fit to form a longitudinally-arranged annular channel, flow dividing holes are transversely formed in the deepening head, and the annular channel and the flow dividing holes are both arranged in the spray gun nozzle. According to the internal mixing double-medium spray gun, the problems that the cooling effect is poor and soot is prone to scaling due to the fact that an external mixing spray gun is large in atomization granularity are solved; and the inner mixing double-medium spray gun solves the problem of large nitrogen consumption of an outer mixing spray gun, and the cost can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment, in particular to an internally mixed dual-medium evaporative cold spray gun special for a converter in a steel plant. Background Art

[0002] It is our common responsibility to protect the environment and make the atmosphere fresh and clean. Controlling smoke emissions should start from the source. Atomizing spray guns are used in steelmaking converter dust removal systems. Their function is to reduce the converter flue gas temperature (starting temperature is about 1500℃, 150-250℃ after cooling), purify the flue gas and collect dust. The main components of converter flue gas are C0 and metallic iron in the dust, which need to be recycled. The cooling evaporator in the converter uses a dual-media spray gun for water spraying and cooling. In order to prevent the CO and Fe elements in the flue gas from being oxidized, the dual-media atomizing spray gun is required to use nitrogen to ensure the stability of the flue gas composition.

[0003] In the prior art, dual-medium external mixing spray guns often have the following shortcomings: 1. The atomized particles are large, the heat absorption speed is slow, and they are not gasified within the effective distance, which easily causes ash scaling; 2. Atomization requires high nitrogen pressure and large consumption, which results in a certain increase in costs. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the particle size of the dual-medium atomizing spray gun in the prior art cannot meet the requirements and the use cost is high, and to propose an internally mixed dual-medium evaporative cooling spray gun specially used for the converter of a steel plant.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A special internal mixed dual-medium evaporative cooling spray gun for a steel plant converter comprises a first pipeline for conveying gas and a second pipeline for conveying liquid, wherein the first pipeline is sleeved on the second pipeline, and a spray gun head is arranged at the output ends of the first pipeline and the second pipeline, and the spray gun head comprises a spray gun core and a spray gun nozzle, wherein the spray gun core comprises a deepening head extending into the spray gun nozzle and a diffusion channel arranged around the deepening head, the deepening head is connected with the second pipeline, and the diffusion channel is connected with the first pipeline; it also comprises a cone sleeve atomizing sheet sleeved on the deepening head, the cone sleeve atomizing sheet and the deepening head are clearance-matched to form a longitudinally arranged annular channel, the annular channel is connected with the diffusion channel, a diverter hole is arranged transversely on the deepening head, and the annular channel and the diverter hole are both arranged in the spray gun nozzle.

[0006] Preferably, a diffusion surface is formed in the inner cavity of the output end of the cone sleeve atomizer, and the diffusion surface extends to the periphery of the diversion hole.

[0007] Furthermore, the rounding radius of the diffusion surface is in the range of 2-5m.

[0008] Preferably, it also includes: a base fixedly connected to the output end of the first pipeline, wherein a first drainage channel connected to the second pipeline and the diversion hole is opened on the base, and a second drainage channel connected to the diffusion channel is opened around the drainage channel; a connecting seat sleeved on the base, wherein a protective sleeve is connected to the connecting seat, and the protective sleeve extends to the output end of the spray gun nozzle.

[0009] Furthermore, a boss is formed at the open end of the spray gun nozzle, which abuts against the annular platform of the cone sleeve atomizer. The output end of the spray gun nozzle has a conical platform, and spray holes are equidistantly arranged on the conical surface of the conical platform. The protective sleeve extends around the spray holes.

[0010] Preferably, a support for fixing the spray gun is installed on the first pipe.

[0011] In order to ensure the sealing stability of the spray gun installation, the support further includes: a support sleeve mounted on the first pipe, a sealing ring is provided at one end of the support sleeve, and a sealing flange for encapsulating the sealing ring is installed on the support sleeve; a mounting flange fixedly connected to the support sleeve, and a first sealing gasket is provided on the mounting flange.

[0012] Preferably, the flow diversion holes are provided in a plurality of groups, and the plurality of flow diversion holes are circumferentially and equidistantly distributed on the cylindrical surface of the deepening head.

[0013] Preferably, the spray gun core and the spray gun nozzle are made of INCOLOY 800H / HT or 321H.

[0014] Preferably, the ratio of the gap size between the cone sleeve atomizer and the deepening head to the diameter size of the diffusion channel is 1:10.

[0015] Compared with the prior art, the present invention provides a special internal mixed dual-medium evaporative cold spray gun for steel plant converter, which has the following beneficial effects: 1. The steel plant's converter-specific internally mixed dual-medium evaporative cooling spray gun has the gas flow direction at the spray gun nozzle perpendicular to the liquid flow direction, and the pressure around the diversion hole is lower, forcing the liquid to form a mixed state with the gas in a more uniform and finer form, thereby greatly reducing the atomized particle size and making the subsequent heat absorption faster. When the fine atomized particles are discharged from the spray gun nozzle, they are gasified within the effective distance, which makes it easier to reduce the phenomenon of soot scaling; 2. The steel plant's special internally mixed dual-medium evaporative cold spray gun for converters forms a diffuser surface with an arc structure in the inner cavity at the output end of the cone sleeve atomizer, which can reduce the airflow fluctuations generated by the outer ring of the cone sleeve atomizer when the airflow flows out of the annular channel, making the mixing effect controllable; 3. The steel plant's converter-specific internally mixed dual-medium evaporative cooling spray gun increases sealing and fastening forms on the internally mixed dual-medium spray gun. The structure of the protective cover reduces the degree of oxidation of CO and Fe elements in the flue gas, increases the service life of the nozzle, reduces costs, and reduces the probability of flue gas leakage and air pollution; 4. The steel plant's special internal mixed dual-medium evaporative cold spray gun for the converter can prevent the gas in the converter from escaping to the outside through the sealing ring between the support sleeve and the first pipe. The mounting flange not only fixes the pipe, but also ensures the sealing effect between the pipe and the furnace wall through the first sealing gasket.

[0016] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The internal mixing dual-medium spray gun of the present invention solves the problems of poor cooling effect, high water consumption and easy scaling of ash caused by large atomization particle size of the external mixing spray gun; and the internal mixing dual-medium spray gun solves the problem of large nitrogen consumption of the external mixing spray gun, which can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a special internal mixed dual-medium evaporative cold spray gun for a steel plant converter proposed by the present invention; Figure 2 This is a schematic diagram of the structure of a spray gun head for a steel plant converter-specific internally mixed dual-medium evaporative cooling spray gun proposed by the present invention; Figure 3 The invention proposes a special internal mixed dual-medium evaporative cold spray gun for steel plant converter Figure 2 The structural diagram of part A in the figure; Figure 4 This is a schematic diagram of the support structure of a steel plant converter-specific internally mixed dual-medium evaporative cold spray gun proposed by the present invention; Figure 5 The invention proposes a special internal mixed dual-medium evaporative cold spray gun for steel plant converter Figure 4 Schematic diagram of the structure of the medium BB; Figure 6 This is a schematic diagram of the spray gun core structure of a steel plant converter-specific internally mixed dual-medium evaporative cooling spray gun proposed by the present invention; Figure 7 The invention proposes a special internal mixed dual-medium evaporative cold spray gun for steel plant converter Figure 6 Schematic diagram of the structure of CC; Figure 8 This is a schematic diagram of the structure of a cone sleeve atomizing piece of an internally mixed dual-medium evaporative cold spray gun for a steel plant converter proposed by the present invention; Fig. 9 The present invention is a schematic diagram of the nozzle structure of a steel plant converter-specific internally mixed dual-medium evaporative cooling spray gun.

[0018] In the figure: 1. first pipeline; 2. second pipeline; 3. base; 4. spray gun core; 401. support platform; 402. diffusion channel; 403. deepening head; 404. diverter hole; 5. cone sleeve atomizer; 501. diffusion surface; 6. spray gun nozzle; 601. spray hole; 7. protective cover; 8. connecting seat; 9. mounting flange; 901. first sealing gasket; 902. support sleeve; 903. sealing ring; 10. second sealing gasket. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0021] Reference Figure 1-Figure 7A steel plant converter-specific internal mixed dual-medium evaporative cold spray gun comprises a first pipeline 1 for conveying gas and a second pipeline 2 for conveying liquid. The first pipeline 1 is sleeved on the second pipeline 2. The specific gas and liquid supply methods are as follows: the annular chamber formed between the first pipeline 1 and the second pipeline 2 is communicated through a pipeline on the side. The pipeline has a flange structure that can be connected to a gas supply device. The end of the second pipeline 2 is fixedly connected with a transfer pipe, which has a threaded structure and can be connected to a liquid supply device. The two have independent paths and are not connected in the conveying stage. In the first The output ends of the pipeline 1 and the second pipeline 2 are provided with a spray gun head, where the gas and liquid are sprayed out in an atomized form from the spray gun head. The specific spray gun head includes a spray gun core 4 and a spray gun nozzle 6. The spray gun core 4 includes a deepening head 403 extending into the spray gun nozzle 6 and a diffusion channel 402 arranged around the deepening head 403. The deepening head 403 is connected to the second pipeline 2, and the diffusion channel 402 is connected to the first pipeline 1, respectively guiding the two fluids to flow and finally mixing at the spray gun nozzle 6; here, there is also a set of cone sleeve atomizing sheets 5 arranged on the deepening head 403, and the cone sleeve atomizing sheet 5 is provided on the second pipeline 2. The sheet 5 and the deepening head 403 form a longitudinally arranged annular channel through clearance fit, and the annular channel is connected to the diffusion channel 402, that is, the path through which the gas flows is sharply reduced when passing through the cone sleeve atomizing sheet 5. Under the condition that the pressure remains unchanged, the flow velocity at this point increases. A diverter hole 404 is provided transversely on the deepening head 403. The annular channel and the diverter hole 404 are both arranged in the spray gun nozzle 6. Under the condition that the supply pressure of the gas and the liquid is equal, the area of ​​the annular channel through which the gas flows is sharply reduced, so that the gas flow The speed increases, and the total area of ​​the diverter holes 404 is basically the same as that of the deepening head 403, so the flow rate of the gas is greater than the flow rate of the liquid. Since the gas flow direction at the spray gun nozzle 6 is perpendicular to the liquid flow direction, the pressure around the diverter holes 404 is lower at this time, forcing the liquid to form a mixed state with the gas in a more uniform and finer form, thereby greatly reducing the particle size of the atomized particles and making the subsequent heat absorption speed faster. When the fine atomized particles are discharged from the spray gun nozzle 6, they are gasified within the effective distance, which makes it easier to reduce the phenomenon of soot scaling.

[0022] In the converter, the internal mixing dual-medium spray gun solves the problems of poor cooling effect, high water consumption and easy scaling of ash caused by large atomization particle size of the external mixing spray gun; and the internal mixing dual-medium spray gun solves the problem of large nitrogen consumption of the external mixing spray gun, which can effectively reduce costs.

[0023] Specifically, the inner cavity of the output end of the cone sleeve atomizer 5 is formed with an arc-shaped diffusion surface 501, which extends to the surrounding of the diverter hole 404, and the arc-shaped structure extends far away from the diverter hole 404. The fillet radius of the diffusion surface 501 is in the range of 2-5 mm, preferably 5 mm here. This structural form can reduce the airflow fluctuation generated by the outer ring of the cone sleeve atomizer 5 when the airflow flows out of the annular channel, so that the mixing effect can be controlled.

[0024] In addition, it also includes a base 3 fixedly connected to the output end of the first pipe 1, a first drainage channel connected to the second pipe 2 and the diversion hole 404 is opened on the base 3, and a second drainage channel connected to the diffusion channel 402 is opened around the drainage channel. The base 3 and the first pipe 1 and the second pipe 2 are all welded, and play the role of transit connection. A second sealing gasket 10 is arranged between the base 3 and the support platform 401 to ensure the sealing effect of the transition connection; a connecting seat 8 is arranged on the outer periphery of the upper part of the base 3, and the connecting seat 8 is welded to the outer wall of the first pipe 1. A protective sleeve 7 is connected to the connecting seat 8, and the protective sleeve 7 extends to the output end of the spray gun nozzle 6. The entire internal mixed dual-medium spray gun has increased sealing and fastening forms, and the structure of the protective sleeve 7 reduces the degree of oxidation of CO and Fe elements in the flue gas, and reduces the probability of air pollution caused by smoke leakage.

[0025] A boss is formed at the open end of the spray gun nozzle 6, which abuts against the annular platform of the cone sleeve atomizing piece 5, and forms a clamping and fixing of the cone sleeve atomizing piece 5 with the bottom of the support platform 401. The output end of the spray gun nozzle 6 has a conical platform, and the conical surface of the conical platform is provided with spray holes 601 equidistantly arranged in a circle, forming an injection path with an injection angle with the axis of the spray gun nozzle 6, and the injection angle is 15°-45°, preferably 30° here, and the protective cover 7 extends to the four sides of the spray hole 601, reducing the degree of oxidation by CO and Fe elements in the flue gas, thereby increasing the service life of the spray gun head and reducing costs.

[0026] A support for fixing the spray gun is installed on the first pipe 1, and the support includes: a support sleeve 902 mounted on the first pipe 1, a sealing ring 903 is arranged at one end of the support sleeve 902, and a sealing flange 904 for encapsulating the sealing ring 903 is installed on the support sleeve 902; a mounting flange 9 fixedly connected to the support sleeve 902, and a first sealing gasket 901 is arranged on the mounting flange 9. When the entire spray gun extends into the corresponding chamber of the converter, the support sleeve 902 can prevent the gas in the converter from escaping to the outside through the sealing ring 903 between the support sleeve 902 and the first pipe 1, and the mounting flange 9 not only fixes the pipe, but also ensures the sealing effect between the pipe and the furnace wall through the first sealing gasket 901.

[0027] The sealing structure of the spray gun and the flange connection prevents partial flue gas oxidation when the pipeline is under negative pressure, and prevents flue gas leakage and air pollution when the pipeline is under positive pressure.

[0028] Specifically, 3 to 6 diversion holes 404 are provided, preferably 4 here, and the 4 groups of diversion holes 404 are equidistantly distributed on the cylindrical surface of the deepening head 403 to ensure uniformity of liquid spraying.

[0029] The material of the spray gun core 4 and the spray gun nozzle 6 is INCOLOY 800H / HT iron-nickel-chromium alloy, which has excellent high-temperature oxidation resistance and thermal shock resistance, or 321H chromium-nickel stainless steel, which contains titanium and has excellent high-temperature oxidation resistance and thermal shock resistance. The use of this material, through its excellent high-temperature resistance, corrosion resistance and creep resistance, ensures safe use in the converter and improves the service life of the spray gun head.

[0030] The ratio of the gap size between the cone sleeve atomizing sheet 5 and the deepening head 403 to the diameter size of the diffusion channel 402 is 1:10, thereby further ensuring that the speed of the gas flowing through is rapidly increased and ensuring that the particle size of the subsequent atomization meets the requirements.

[0031] In the present invention, the dual-media spray gun is connected to the furnace wall of the converter through the mounting flange 9, the spray gun head extends into the converter, the fluid supply is external, and is connected to the corresponding liquid and gas. The sealing structure on the mounting flange 9 makes the spray gun safer and more environmentally friendly to use. The air supply structure with a sharply changed area can make the spray gun atomized particles lower, thereby increasing the heat absorption speed, quickly gasifying within an effective distance, and reducing the phenomenon of soot scaling. This method also greatly reduces the nitrogen consumption and lowers the cost. At the same time, the protective cover 7 reduces the degree of oxidation of CO and Fe elements in the flue gas, reduces the probability of air pollution caused by flue gas leakage, and the selection of high-temperature resistant materials for the spray gun head also increases the service life of the nozzle. The specific steps of mixing and refining the particle size are as follows: Primary liquid fragmentation: the cross hole formed by the diversion hole 404 divides the liquid flow into four smaller fluids; Secondary liquid breakage: the four liquid streams are sheared by the air coming out of the cone sleeve atomizer 5 when leaving the cross hole; Final mixing: The function of the spray gun nozzle 6 is to form the final mixing, that is, when the liquid droplets are sprayed out through the multiple small spray holes 601 on the spray gun nozzle 6, there is another pressure drop, thereby producing a third atomization effect.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steel mill converter-specific internally mixed dual-medium evaporative cooling spray gun, comprising a first pipeline (1) for conveying gas and a second pipeline (2) for conveying liquid, wherein the first pipeline (1) is sleeved on the second pipeline (2), and spray gun heads are arranged at the output ends of the first pipeline (1) and the second pipeline (2), characterized in that: The spray gun head comprises a spray gun core (4) and a spray gun nozzle (6). The spray gun core (4) comprises a deepening head (403) extending into the spray gun nozzle (6) and a diffusion channel (402) arranged around the deepening head (403), the deepening head (403) is connected to the second pipeline (2), and the diffusion channel (402) is connected to the first pipeline (1); It also includes a cone sleeve atomizing sheet (5) sleeved on the deepening head (403), wherein the cone sleeve atomizing sheet (5) and the deepening head (403) are fitted with a clearance to form a longitudinally arranged annular channel, wherein the annular channel is connected to the diffusion channel (402), and a diverter hole (404) is provided in the deepening head (403) in a transverse direction, wherein the annular channel and the diverter hole (404) are both arranged in the spray gun nozzle (6).

2. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1 is characterized in that: The inner cavity at the output end of the cone sleeve atomizer (5) is formed with a diffusion surface (501), and the diffusion surface (501) extends to the periphery of the diversion hole (404).

3. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 2 is characterized in that: The rounding radius of the diffusion surface (501) is in the range of 2-5 m.

4. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1, characterized in that: Also includes: A base (3) fixedly connected to the output end of the first pipeline (1), The base (3) is provided with a first drainage channel connected to the second pipe (2) and the diversion hole (404), and a second drainage channel connected to the diffusion channel (402) is provided around the drainage channel; A connecting seat (8) sleeved on the base (3), Wherein, a protective sleeve (7) is connected to the connecting seat (8), and the protective sleeve (7) extends to the output end of the spray gun nozzle (6).

5. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 4, characterized in that: The open end of the spray gun nozzle (6) is formed with a boss, which abuts against the annular platform of the cone sleeve atomizing plate (5). The output end of the spray gun nozzle (6) has a cone-shaped platform, and the cone surface of the cone-shaped platform is provided with spray holes (601) at equal intervals in a circle. The protective sleeve (7) extends to the surrounding of the spray holes (601).

6. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1, characterized in that: A support for fixing the spray gun is installed on the first pipe (1).

7. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 6, characterized in that: The support comprises: A support sleeve (902) sleeved on the first pipe (1), a sealing ring (903) being provided at one end of the support sleeve (902), and a sealing flange (904) encapsulating the sealing ring (903) being installed on the support sleeve (902); A mounting flange (9) fixedly connected to the support sleeve (902), wherein a first sealing gasket (901) is provided on the mounting flange (9).

8. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1, characterized in that: The flow diversion holes (404) are provided in a plurality of groups, and the plurality of flow diversion holes (404) are circumferentially and equidistantly distributed on the cylindrical surface of the deepening head (403).

9. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1, characterized in that: The spray gun core (4) and the spray gun nozzle (6) are made of INCOLOY 800H / HT or 321H.

10. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1, characterized in that: The ratio of the gap size between the cone sleeve atomizing sheet (5) and the deepening head (403) to the diameter size of the diffusion channel (402) is 1:10.

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