Chaotic stirring spray gun with premixing, reducing, side-blowing and multi-pore-channel structure

Abstract

The invention discloses a premixing gradually-shrinking side-blowing multi-pore-channel structure chaos stirring spray gun, and relates to the technical field of thermometallurgy, the premixing gradually-shrinking side-blowing multi-pore-channel structure chaos stirring spray gun comprises a gradually-shrinking type pulverized coal pipeline, a spraying nozzle and a spraying nozzle, the first spray gun outer pipe is arranged on the outer sides of the multiple flow guide ridges in a sleeving mode, every two adjacent flow guide ridges, the outer side face of the gradually-shrunk pulverized coal pipeline and the inner side face of the first spray gun outer pipe define a gradually-shrunk gas flow channel, and the sectional area of the gradually-shrunk gas flow channel is gradually reduced from the inlet end to the outlet end; the oxygen-enriched gas disperses airflow through a plurality of tapered gas flow channels to form fine and uniform bubble groups, and the flow speed is increased; the oxygen-enriched gas in the bubble state is beneficial to increasing the gas-liquid and gas-solid contact area in the molten pool and improving the mass transfer effect, the oxygen-enriched gas with the high flow rate can penetrate through a slag layer after being sprayed into the molten pool, fluid is guided to do chaotic motion in the molten pool, the gas-slag mixing uniformity is improved, and therefore the stirring effect and the reaction rate are improved.

Description

Technical Field

[0001] The invention relates to the technical field of pyrometallurgy, in particular to a premixed tapered side-blowing chaotic stirring lance with a multi-porous structure. Background Art

[0002] In the pyrometallurgical process, oxygen-enriched spray guns are used to spray oxygen-enriched gas into the molten pool to increase the oxygen concentration in the molten pool, thereby significantly increasing the reaction rate. Existing oxygen-enriched spray guns have the following shortcomings:

[0003] 1. Insufficient penetration depth of the slag layer, uneven mixing of gas and slag, and insufficient stirring effect of the slag layer lead to limited reaction rate.

[0004] 2. Oxygen-enriched spray guns generally spray oxygen-enriched gas and pulverized coal into the molten pool together, and compensate the molten pool temperature through the combustion of pulverized coal. However, the pulverized coal and oxygen-enriched gas are not mixed evenly, and some pulverized coal is not burned fully, resulting in problems such as residual pulverized coal and insufficient compensation temperature.

[0005] In view of this, how to provide an oxygen-enriched lance that can partially or completely solve the above-mentioned deficiencies is a problem that those skilled in the art urgently need to solve. Summary of the Invention

[0006] The purpose of the present invention is to provide a premixed, tapered, side-blowing, multi-porous structure chaotic stirring spray gun to solve the problems existing in the prior art.

[0007] To achieve the above object, the present invention provides a premixed, tapered, side-blowing, multi-porous structure chaotic stirring spray gun, comprising:

[0008] The inner diameter of the tapered pulverized coal pipeline gradually decreases from the inlet end to the outlet end;

[0009] A plurality of guide ridges are provided on the outside of the tapered pulverized coal pipeline along the length direction of the tapered pulverized coal pipeline, and the plurality of guide ridges are arranged along the circumference of the tapered pulverized coal pipeline;

[0010] The first lance outer tube is sleeved on the outer side of the plurality of guide ridges, and two adjacent guide ridges, the outer side surface of the tapered pulverized coal pipe, and the inner side surface of the first air injection outer tube form a tapered gas flow channel, wherein the cross-sectional area of ​​the tapered gas flow channel gradually decreases from the inlet end to the outlet end;

[0011] The second spray gun outer tube is connected to the tail end of the first spray gun outer tube. A premixing flow channel is defined in the second spray gun outer tube. The premixing flow channel is connected to the outlet end of the tapered pulverized coal pipeline and the outlet end of the tapered gas flow channel respectively.

[0012] Furthermore, it also includes:

[0013] an inner tube of the lance, one end of which is connected to the inlet end of the tapered pulverized coal pipeline and the other end of which extends away from the tapered pulverized coal pipeline;

[0014] The third spray gun outer tube has one end connected to the head end of the first spray gun outer tube, and the other end extends in a direction away from the first spray gun outer tube; an oxygen-rich gas flow channel is defined between the third spray gun outer tube and the spray gun inner tube, and the oxygen-rich gas flow channel is connected to the inlet end of the tapered gas flow channel.

[0015] Furthermore, it also includes:

[0016] The spray gun sleeve has the same outer diameter as the first spray gun outer tube, the second spray gun outer tube and the third spray gun outer tube, and the spray gun sleeve is sleeved on the outer sides of the first spray gun outer tube, the second spray gun outer tube and the third spray gun outer tube.

[0017] Furthermore, it also includes:

[0018] The flange is sleeved on the outer side of the spray gun sleeve and close to the other end of the third spray gun outer tube.

[0019] Furthermore, the premixing flow channel corresponds to the molten pool and is used to blow a mixed gas of oxygen-rich gas and coal powder into the molten pool and form turbulence in the molten pool.

[0020] Furthermore, the cross section of the tapered gas flow channel is fan-shaped, and the width of the guide ridge gradually increases from the inlet end to the outlet end of the tapered gas flow channel.

[0021] Furthermore, the tapered gas flow channel and the tapered pulverized coal pipeline are provided with 3-5 guide ribs along the length direction.

[0022] Furthermore, the inner diameter ratio of the inlet end and the outlet end of the tapered pulverized coal pipe is 1.2-1.5; the cross-sectional area ratio of the inlet end and the outlet end of the tapered gas flow channel is 1.2-1.5.

[0023] The present invention discloses the following technical effects:

[0024] 1. Oxygen-enriched gas disperses the airflow through multiple tapered gas flow channels, forming a small and uniform bubble group and increasing the flow rate. The oxygen-enriched gas in the bubble state is beneficial to increasing the gas-liquid and gas-solid contact areas in the molten pool, improving the mass transfer effect. After being sprayed into the molten pool, the high-flow oxygen-enriched gas can deeply penetrate the slag layer, guide the chaotic motion of the fluid in the molten pool, improve the uniformity of gas-slag mixing, and thus improve the stirring effect and reaction rate.

[0025] 2. The pulverized coal increases its flow rate through the tapered pulverized coal pipeline. After the oxygen-enriched gas and pulverized coal increase their flow rate, they collide at high speed in the premixing channel, quickly completing the mixing and improving the mixing uniformity. After mixing, they are sprayed into the molten pool and form turbulence in the molten pool, which can reduce the flow dead zone, enhance the mixing uniformity, improve the pulverized coal combustion effect, and avoid the problem of insufficient pulverized coal combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 Schematic diagram of the internal structure of the present invention;

[0029] Figure 3 Schematic diagram of the tapered pulverized coal pipeline and the tapered gas flow channel;

[0030] Figure 4 It is a cross-sectional view of the structure of the present invention;

[0031] Among them, 1. Flange; 2. Spray gun sleeve; 3. Third spray gun outer tube; 4. Oxygen-enriched gas flow channel; 5. Spray gun inner tube; 6. Gradual-convergent coal powder pipeline; 7. Gradual-convergent gas flow channel; 8. Guide ridge; 9. First spray gun outer tube; 10. Premix flow channel; 11. Second spray gun outer tube. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-4 As shown, an embodiment of the present invention provides a premixed tapered side-blowing multi-porous structure chaotic stirring spray gun, comprising:

[0035] The inner diameter of the tapered pulverized coal pipe 6 gradually decreases from the inlet end to the outlet end;

[0036] A plurality of guide ridges 8 are provided on the outside of the tapered pulverized coal pipe 6 along the length direction of the tapered pulverized coal pipe 6, and the plurality of guide ridges 8 are arranged along the circumference of the tapered pulverized coal pipe 6;

[0037] The first lance outer tube 9 is sleeved on the outside of the plurality of guide ridges 8. Two adjacent guide ridges 8, the outer side surface of the tapered pulverized coal pipe 6, and the inner side surface of the first jet outer tube form a tapered gas flow channel 7. The cross-sectional area of ​​the tapered gas flow channel 7 gradually decreases from the inlet end to the outlet end.

[0038] The second lance outer tube 11 is connected to the tail end of the first lance outer tube 9. A premixing flow channel 10 is defined in the second lance outer tube 11. The premixing flow channel 10 is connected to the outlet end of the tapered pulverized coal pipe 6 and the outlet end of the tapered gas flow channel 7 respectively.

[0039] In this embodiment, it also includes:

[0040] The lance inner tube 5 has one end connected to the inlet end of the tapered pulverized coal pipe 6 and the other end extending away from the tapered pulverized coal pipe 6;

[0041] One end of the third spray gun outer tube 3 is connected to the head end of the first spray gun outer tube 9, and the other end extends in the direction away from the first spray gun outer tube 9; an oxygen-rich gas flow channel 4 is defined between the third spray gun outer tube 3 and the spray gun inner tube 5, and the oxygen-rich gas flow channel 4 is connected to the inlet end of the tapered gas flow channel 7.

[0042] In this embodiment, it also includes:

[0043] The spray gun sleeve 2 , the first spray gun outer tube 9 , the second spray gun outer tube 11 and the third spray gun outer tube 3 have the same outer diameter, and the spray gun sleeve 2 is sleeved on the outside of the first spray gun outer tube 9 , the second spray gun outer tube 11 and the third spray gun outer tube 3 .

[0044] In this embodiment, it also includes:

[0045] The flange 1 is sleeved on the outside of the spray gun sleeve 2 and is close to the other end of the third spray gun outer tube 3.

[0046] In this embodiment, the premixing channel 10 corresponds to the molten pool and is used to blow a mixed gas of oxygen-rich gas and pulverized coal into the molten pool and form turbulence in the molten pool.

[0047] In this embodiment, six tapered gas flow channels 7 are provided in total, and their cross sections are fan-shaped. The width of the guide ridges 8 gradually increases from the inlet end to the outlet end of the tapered gas flow channel 7 .

[0048] In this embodiment, the tapered gas flow channel 7 and the tapered pulverized coal pipe 6 are provided with 3-5 guide ribs along the length direction. The guide ribs can suppress the separation of the airflow boundary layer and reduce the pressure loss.

[0049] In this embodiment, the inner diameter ratio of the inlet and outlet ends of the tapered pulverized coal pipe 6 is 1.2-1.5; the cross-sectional area ratio of the inlet and outlet ends of the tapered gas flow channel 7 is 1.2-1.5.

[0050] The specific working process is as follows:

[0051] The pulverized coal is input through the inner tube 5 of the spray gun by gas blowing. The pulverized coal enters the tapered pulverized coal pipe 6 through the inner tube 5 of the spray gun. Since the inner diameter of the tapered pulverized coal pipe 6 gradually decreases from the inlet end to the outlet end, the pulverized coal is accelerated in the tapered pulverized coal pipe 6 and finally enters the premixing channel 10 from the outlet end of the tapered pulverized coal pipe 6.

[0052] Oxygen-enriched gas is introduced through oxygen-enriched gas flow channel 4 and distributed to multiple tapered gas flow channels 7, forming a cluster of small, uniform bubbles. Because the inner diameter of each tapered gas flow channel 7 decreases gradually from the inlet to the outlet, the oxygen-enriched gas is accelerated within the tapered gas flow channel 7 and ultimately enters the premixing flow channel 10 from the outlet of the tapered gas flow channel 7. The oxygen-enriched gas and pulverized coal collide at high speed within the premixing flow channel 10 and are rapidly mixed.

[0053] The mixed gas of oxygen-rich gas and pulverized coal is sprayed into the molten pool from the premixing flow channel 10, and forms turbulent flow in the molten pool.

[0054] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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.

[0055] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A premixed tapered side-blowing multi-porous structure chaotic stirring spray gun, characterized in that: include: a tapered pulverized coal pipe (6) whose inner diameter gradually decreases from the inlet end to the outlet end; A plurality of guide ridges (8) are provided on the outside of the tapered pulverized coal pipe (6) along the length direction of the tapered pulverized coal pipe (6), and the plurality of guide ridges (8) are arranged along the circumference of the tapered pulverized coal pipe (6); The first spray gun outer tube (9) is sleeved on the outer sides of the plurality of guide ridges (8), and two adjacent guide ridges (8), the outer side surface of the tapered pulverized coal pipe (6), and the inner side surface of the first spray outer tube form a tapered gas flow channel (7), wherein the cross-sectional area of ​​the tapered gas flow channel (7) gradually decreases from the inlet end to the outlet end; The second spray gun outer tube (11) is connected to the tail end of the first spray gun outer tube (9), and a premixing flow channel (10) is defined in the second spray gun outer tube (11). The premixing flow channel (10) is respectively connected to the outlet end of the tapered pulverized coal pipeline (6) and the outlet end of the tapered gas flow channel (7).

2. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 1, characterized in that: Also includes: An inner tube (5) of the lance, one end of which is connected to the inlet end of the tapered pulverized coal pipeline (6) and the other end of which extends in a direction away from the tapered pulverized coal pipeline (6); A third spray gun outer tube (3) has one end connected to the head end of the first spray gun outer tube (9), and the other end extending in a direction away from the first spray gun outer tube (9); an oxygen-enriched gas flow channel (4) is defined between the third spray gun outer tube (3) and the spray gun inner tube (5), and the oxygen-enriched gas flow channel (4) is connected to the inlet end of the tapered gas flow channel (7).

3. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 2, characterized in that: Also includes: The spray gun sleeve (2) has the same outer diameter as the first spray gun outer tube (9), the second spray gun outer tube (11) and the third spray gun outer tube (3), and the spray gun sleeve (2) is sleeved on the outer sides of the first spray gun outer tube (9), the second spray gun outer tube (11) and the third spray gun outer tube (3).

4. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 3, characterized in that: Also includes: The flange (1) is sleeved on the outside of the spray gun sleeve (2) and is close to the other end of the third spray gun outer tube (3).

5. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 1, characterized in that: The premixing channel (10) corresponds to the molten pool and is used for blowing a mixed gas of oxygen-rich gas and coal powder into the molten pool and forming turbulence in the molten pool.

6. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 1, characterized in that: The cross section of the tapered gas flow channel (7) is fan-shaped, and the width of the guide ridge (8) gradually increases from the inlet end to the outlet end of the tapered gas flow channel (7).

7. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 6, characterized in that: The tapered gas flow channel (7) and the tapered coal powder pipeline (6) are provided with 3-5 flow guide ribs along the length direction.

8. The premixed tapered side-blowing multi-porous structure chaotic stirring spray gun according to claim 1, characterized in that: The ratio of the inner diameters of the inlet and outlet ends of the tapered pulverized coal pipe (6) is 1.2-1.5; and the ratio of the cross-sectional areas of the inlet and outlet ends of the tapered gas flow channel (7) is 1.2-1.5.

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