A special internal mixing double-medium evaporation cooling spray gun for steel plant converters

Abstract

The present invention discloses a special internal mixing dual-medium evaporation cooling spray gun for steel plant converters, belonging to the technical field of metallurgical equipment. A special internal mixing dual-medium evaporation cooling spray gun for steel plant converters includes a spray gun head at the output end of a first pipeline and a second pipeline. The spray gun head includes a spray gun core and a spray gun nozzle. The spray gun core includes a deepening head extending into the spray gun nozzle and a diffusion channel arranged around the deepening head. The deepening head is communicated with the second pipeline, and the diffusion channel is communicated with the first pipeline. It also includes a conical sleeve atomization sheet sleeved on the deepening head. The conical sleeve atomization sheet and the deepening head form a longitudinally arranged annular channel through clearance fit. A shunt hole is transversely arranged on the deepening head. Both the annular channel and the shunt hole are arranged in the spray gun nozzle. The internal mixing dual-medium spray gun of the present invention solves the problems of poor cooling effect caused by large atomization particle size of the external mixing spray gun and easy scaling of soot. And the internal mixing dual-medium spray gun solves the problem of large nitrogen consumption of the external mixing spray gun, and can effectively reduce costs.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical equipment, and particularly to an internal mixing dual-medium evaporation cooling spray gun specially used for a steel plant converter. Background Art

[0002] Protecting the environment and keeping the atmosphere fresh and clean is the common responsibility of mankind. Controlling soot emissions should start from the source. The atomizing spray gun is applied to the dust removal system of the steelmaking converter, and its function is to reduce the temperature of the converter flue gas (the starting temperature is about 1500°C, and the temperature after cooling is 150 - 250°C), and to purify the flue gas and collect dust. The main components of the converter flue gas are CO and the dust contains metallic iron, both of which need to be recycled. The double-medium spray gun is used for spraying water to cool the evaporator in the converter. To prevent the oxidation of CO and Fe elements in the flue gas, nitrogen gas is required for the double-medium atomizing spray gun to ensure the stability of the flue gas components.

[0003] In the prior art, the double-medium external mixing spray gun mostly has the following deficiencies:

[0004] 1. The atomized particles are large, the heat absorption speed is slow, and they are not vaporized within the effective distance, which easily causes the phenomenon of soot scaling;

[0005] 2. The atomization requires a high nitrogen pressure and a large consumption, resulting in a certain increase in cost. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems that the particle size of the double-medium atomizing spray gun in the prior art cannot meet the requirements and the use cost is relatively high, and to propose an internal mixing dual-medium evaporation cooling spray gun specially used for a steel plant converter.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] An internal mixing dual-medium evaporation cooling spray gun specially used for a steel plant converter, including a first pipe for transporting gas and a second pipe for transporting liquid. The first pipe is sleeved on the second pipe, and the output ends of the first pipe and the second pipe are provided with a spray gun head. The spray gun head includes a spray gun core and a spray gun nozzle. Among them, the spray gun core includes a deepening head extending into the spray gun nozzle and a diffusion channel surrounding the deepening head. The deepening head is communicated with the second pipe, and the diffusion channel is communicated with the first pipe; it also includes a conical sleeve atomizing sheet sleeved on the deepening head. The conical sleeve atomizing sheet and the deepening head form a longitudinally arranged annular channel through clearance fit. The annular channel is communicated with the diffusion channel, and the deepening head is provided with a laterally arranged shunt hole. Both the annular channel and the shunt hole are arranged in the spray gun nozzle.

[0009] Preferably, the inner cavity of the output end of the conical sleeve atomizing sheet forms a diffusion surface, and the diffusion surface extends around the shunt hole.

[0010] Furthermore, the radius of the rounded corner of the diffusion surface ranges from 2 to 5 mm.

[0011] Preferably, it further includes: a base fixedly connected to the output end of the first pipeline, wherein a first drainage channel communicating with the second pipeline and the diversion holes is provided on the base, and a second drainage channel communicating with the diffusion channel is provided 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.

[0012] Furthermore, a boss is formed at the open end of the spray gun nozzle, the boss abuts against the annular platform of the conical sleeve atomization sheet, the output end of the spray gun nozzle has a conical platform, spray holes are circumferentially and equidistantly arranged on the conical surface of the conical platform, and the protective sleeve extends around the spray holes.

[0013] Preferably, a support for fixing the spray gun is installed on the first pipeline.

[0014] In order to ensure the sealing stability of the spray gun installation, furthermore, the support includes: a support sleeve sleeved on the first pipeline, a sealing ring is arranged at one end of the support sleeve, and a sealing flange for encapsulating the sealing ring is installed on the support sleeve; an installation flange fixedly connected to the support sleeve, and a first gasket is arranged on the installation flange.

[0015] Preferably, multiple groups of diversion holes are provided, and the multiple groups of diversion holes are circumferentially and equidistantly distributed on the cylindrical surface of the deepening head.

[0016] Preferably, the materials of the spray gun core and the spray gun nozzle are INCOLOY 800H / HT or 321H.

[0017] Preferably, the ratio of the clearance dimension between the conical sleeve atomization sheet and the deepening head to the diameter dimension of the diffusion channel is 1:10.

[0018] Compared with the prior art, the present invention provides an internal mixing dual-medium evaporation cooling spray gun special for steel plant converters, which has the following beneficial effects:

[0019] 1. For the internal mixing dual-medium evaporation cooling spray gun special for steel plant converters, the gas flow direction at the spray gun nozzle is perpendicular to the liquid flow direction, the pressure around the diversion holes is lower, forcing the liquid to form a mixed state with the gas in a more uniform and finer form, thereby greatly reducing the atomization particle size, making the subsequent heat absorption speed faster, and when the fine atomization particles are discharged from the spray gun nozzle, gasification occurs within the effective distance, making it easier to reduce the phenomenon of soot scaling;

[0020] 2. For the internal mixing dual-medium evaporation cooling spray gun special for steel plant converters, an arc-shaped diffusion surface is formed in the inner cavity at the output end of the conical sleeve atomization sheet, which can reduce the air flow fluctuation generated at the outer ring of the conical sleeve atomization sheet when the air flow flows out of the annular channel, making the mixing effect controllable;

[0021] 3. The special internal mixing dual-medium evaporation cooling spray gun for the converter of this steel plant, by adding a sealing and fastening form to the internal mixing dual-medium spray gun, the structure of the protective sleeve reduces the degree of oxidation of CO and Fe elements in the flue gas, improves the service life of the nozzle head, reduces costs and at the same time reduces the probability of air pollution caused by flue gas leakage.

[0022] 4. The special internal mixing dual-medium evaporation cooling spray gun for the converter of this steel plant, the sealing ring between the support sleeve and the first pipeline can prevent the gas in the converter from escaping to the outside. While fixing the pipeline, the installation flange also ensures the sealing effect with the furnace wall through the first gasket.

[0023] The parts not involved in this 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 soot 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, and can effectively reduce costs. Brief Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention;

[0025] Figure 2 It is a schematic structural diagram of the nozzle head of a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention;

[0026] Figure 3 It is a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention Figure 2 Schematic structural diagram of part A therein;

[0027] Figure 4 It is a schematic structural diagram of the support of a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention;

[0028] Figure 5 It is a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention Figure 4 Schematic structural diagram of B-B therein;

[0029] Figure 6 It is a schematic structural diagram of the spray gun core of a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention;

[0030] Figure 7 It is a special internal mixing dual-medium evaporation cooling spray gun for the converter of a steel plant proposed by the present invention Figure 6 Schematic structural diagram of C-C therein;

[0031] Figure 8Schematic diagram of the conical sleeve atomizing sheet structure of a special internal mixing dual-medium evaporation cooling spray gun for steel plant converters proposed by the present invention;

[0032] Figure 9 Schematic diagram of the spray gun nozzle structure of a special internal mixing dual-medium evaporation cooling spray gun for steel plant converters proposed by the present invention.

[0033] 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. Shunt hole; 5. Conical sleeve atomizing sheet; 501. Diffusion surface; 6. Spray gun nozzle; 601. Spray hole; 7. Protective sleeve; 8. Connecting seat; 9. Installation flange; 901. First gasket; 902. Support sleeve; 903. Sealing ring; 10. Second gasket. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation to the present invention.

[0036] Embodiment:

[0037] Refer to Figures 1-7, A special internal mixing dual-medium evaporation cooling spray gun for steelmaking converters, which includes a first pipe 1 for transporting gas and a second pipe 2 for transporting liquid. The first pipe 1 is sleeved on the second pipe 2. Specifically, the gas supply and liquid supply methods are as follows: The annular chamber formed between the first pipe 1 and the second pipe 2 is connected through a pipe on the side. This pipe has a flange structure and can be connected to the gas supply equipment. The end of the second pipe 2 is fixedly connected with a transition pipe, and this transition pipe has a threaded structure and can be connected to the liquid supply equipment. The two have independent paths and are not connected during the transportation stage. At the output ends of the first pipe 1 and the second pipe 2, there is a spray gun head. Here, the gas and liquid are sprayed out in an atomized form. Specifically, the 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 pipe 2, and the diffusion channel 402 is connected to the first pipe 1, respectively guiding the flow of the two fluids and finally mixing at the spray gun nozzle 6; Here, there is also a conical sleeve atomization sheet 5 sleeved on the deepening head 403. The conical sleeve atomization sheet 5 and the deepening head 403 form a longitudinally arranged annular channel through clearance fit. The annular channel is connected to the diffusion channel 402. That is, when the path of the gas flow passes through the conical sleeve atomization sheet 5, the cross-sectional area of the flow-through area decreases sharply. Under the condition that the pressure remains unchanged, the flow rate at this place increases. The deepening head 403 is provided with a shunt hole 404 arranged horizontally. Both the annular channel and the shunt hole 404 are arranged in the spray gun nozzle 6. When the supply pressures of the gas and the liquid are equal, since the cross-sectional area of the annular channel through which the gas flows decreases sharply, the gas flow rate can be increased, and the total area of the shunt holes 404 is basically the same as that of the deepening head 403. Therefore, the flow rate of the gas is greater than that of the liquid. And because the gas flow direction and the liquid flow direction at the spray gun nozzle 6 are perpendicular to each other, the pressure around the shunt hole 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 atomization particle size, making the subsequent heat absorption speed faster. And when the fine atomization particles are discharged from the spray gun nozzle 6, gasification occurs within an effective distance, making it easier to reduce the phenomenon of soot scaling.

[0038] In the converter, the above-mentioned internal mixing dual-medium spray gun solves the problems of poor cooling effect, high water consumption, and easy soot scaling 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, and can effectively reduce costs.

[0039] Specifically, an arc-shaped diffusion surface 501 is formed in the inner cavity of the output end of the conical sleeve atomizing sheet 5. The diffusion surface 501 extends around the diversion holes 404, and the arc-shaped structure extends away from the diversion holes 404. The fillet radius range of the diffusion surface 501 is 2-5 mm, preferably 5 mm here. This structural form can reduce the air flow fluctuations generated at the outer ring of the conical sleeve atomizing sheet 5 when the air flow flows out of the annular channel, making the mixing effect controllable.

[0040] In addition, it further includes a base 3 fixedly connected to the output end of the first pipeline 1. A first drainage channel communicating with the second pipeline 2 and the diversion holes 404 is provided on the base 3. A second drainage channel communicating with the diffusion channel 402 is provided around the drainage channel. The base 3 is welded to both the first pipeline 1 and the second pipeline 2, playing a role of transfer connection. A second gasket 10 is provided between the base 3 and the support table 401 to ensure the sealing effect of the transition connection; A connecting seat 8 is sleeved on the outer periphery of the upper part of the base 3. The connecting seat 8 is welded to the outer wall of the first pipeline 1. A protective sleeve 7 is connected to the connecting seat 8. The protective sleeve 7 extends to the output end of the spray gun nozzle 6. The overall internal mixing dual-medium spray gun increases the sealing and fastening forms. 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 flue gas leakage.

[0041] A boss is formed at the open end of the spray gun nozzle 6. The boss abuts against the annular platform of the conical sleeve atomizing sheet 5, and it forms a clamping and fixing of the conical sleeve atomizing sheet 5 with the bottom of the support table 401. The output end of the spray gun nozzle 6 has a conical platform. Spray holes 601 are circumferentially and equidistantly arranged on the conical surface of the conical platform, forming a spraying path with a spraying angle with respect to the axis of the spray gun nozzle 6. This spraying angle is between 15° and 45°, preferably 30° here. And the protective sleeve 7 extends around the spray holes 601, reducing the degree of oxidation by CO and Fe elements in the flue gas, thereby prolonging the service life of the spray gun head and reducing costs.

[0042] A support for fixing the spray gun is installed on the first pipeline 1. The support includes: a support sleeve 902 sleeved on the first pipeline 1. One end of the support sleeve 902 is provided with a sealing ring 903. A sealing flange 904 for encapsulating the sealing ring 903 is installed on the support sleeve 902; An installation flange 9 fixedly connected to the support sleeve 902. A first gasket 901 is provided on the installation 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 pipeline 1. While fixing the pipeline, the installation flange 9 also ensures the sealing effect with the furnace wall through the first gasket 901.

[0043] The sealing structure of the connection between the spray gun and the flange prevents partial oxidation of the flue gas under negative pressure in the pipeline and also prevents flue gas leakage and air pollution under positive pressure in the pipeline.

[0044] Specifically, there are 3 - 6 flow - dividing holes 404, preferably 4 here, and the 4 groups of flow - dividing holes 404 are evenly distributed in a circular pattern on the cylindrical surface of the deepening head 403, ensuring the uniformity of liquid spraying.

[0045] The materials of the spray gun core 4 and the spray gun nozzle 6 are INCOLOY 800H / HT iron - nickel - chromium alloy, which has excellent high - temperature oxidation resistance and thermal shock resistance, or 321H chromium - nickel stainless steel containing titanium element, which has excellent high - temperature oxidation resistance and thermal shock resistance. Using this material, through its excellent high - temperature resistance, corrosion resistance and creep resistance, it ensures safe use in the converter and extends the service life of the spray gun head.

[0046] The ratio of the clearance size between the conical sleeve atomizing sheet 5 and the deepening head 403 to the diameter size of the diffusion channel 402 is 1:10, thereby further ensuring a rapid increase in the speed of the gas flow when passing through, and ensuring that the particle size of the subsequent atomization meets the requirements.

[0047] In the present invention, the dual - medium 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 replenishment is outside 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. The gas supply structure with a sharp change in area can make the atomized particles of the spray gun lower, thereby increasing the heat absorption speed and quickly gasifying within the effective distance, reducing the phenomenon of soot scaling. This method also significantly reduces the nitrogen consumption and the cost. At the same time, 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 flue gas leakage. The selection of high - temperature - resistant materials for the spray gun head also increases the service life of the spray head. Specifically, the steps of mixing and refining the particle size are as follows:

[0048] Primary liquid fragmentation: The cross - shaped holes formed by the flow - dividing holes 404 divide the liquid flow into four smaller fluid streams.

[0049] Secondary liquid fragmentation: The four fluid streams are sheared by the air coming out of the conical sleeve atomizing sheet 5 when leaving the cross - shaped holes.

[0050] Final mixing: The function of the spray gun nozzle 6 is to form the final mixing, that is, when the liquid droplets are ejected through the multiple small spray holes 601 on the spray gun nozzle 6, there is another pressure drop, thereby generating a third atomization effect.

[0051] The above - mentioned is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A steel plant converter-specific internal 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 the output ends of the first pipeline (1) and the second pipeline (2) are provided with spray gun heads, 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); The invention also comprises a cone sleeve atomizing piece (5) sleeved on the deepening head (403), wherein the cone sleeve atomizing piece (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 transversely on the deepening head (403), wherein the annular channel and the diverter hole (404) are both arranged in the spray gun nozzle (6), and a diffusion surface (501) is formed in the inner cavity of the output end of the cone sleeve atomizing piece (5), wherein the diffusion surface (501) extends to the surrounding of the diverter hole (404).

2. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 1 is characterized in that: The rounding radius of the diffusion surface (501) is in the range of 2-5 m.

3. 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).

4. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 3 is 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).

5. 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 pipeline (1).

6. The internal mixed dual-medium evaporative cooling spray gun for converter in steel plant according to claim 5, 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) is fixedly connected to the support sleeve (902), and a first sealing gasket (901) is arranged on the mounting flange (9).

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

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

9. 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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