Sintering material surface fuel gas spraying device and method thereof

Abstract

The invention discloses a sintering material surface fuel gas spraying device and a method thereof, and belongs to the technical field of metallurgical sintering. The device comprises a blowing cover body, a flexible positive pressure top cover is arranged at the top of the blowing cover body, and a grating type rectifying plate is mounted on the inner side of the blowing cover body; a fuel gas conveying pipeline is arranged above the flexible positive pressure top cover, dynamic and static sealing type pipe sleeves are arranged on the fuel gas conveying pipeline at intervals, the bottoms of the dynamic and static sealing type pipe sleeves are connected with rotary vertical pull pipes, and the bottoms of the rotary vertical pull pipes are connected with charge level spraying pipe rows; according to the invention, a fixed pipe row is changed into a rotary material surface spraying pipe row, and air and fuel gas are changed from forward spraying in the same direction into reverse spraying in the opposite direction, so that the mixing uniformity of the fuel gas and the air can be effectively improved, and the heat supply consistency of each area in a material layer is ensured, thereby greatly improving the effect of fuel gas injection enhanced sintering.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical sintering, and more specifically, to a sintering material surface gas spraying device and method thereof. Background Art

[0002] Sintering is an important process in the long-process ironmaking, providing more than 70% of the raw materials charged into the blast furnace. Traditional sintering is mainly heated by solid fuel, with an unreasonable heating method, resulting in high energy consumption and poor quality.

[0003] Spraying combustible gas on the sintering material surface to replace part of the solid fuel for heating is one of the most promising low-carbon sintering technologies recognized in the industry. It sprays combustible gases such as natural gas and coke oven gas above the material surface after sintering ignition, enabling them to be sucked into the sintering material layer for combustion heating, replacing part of the solid fuel for heating, and simultaneously improving the heating uniformity within the material layer, thereby achieving the effects of reducing the solid fuel consumption in the sintering process and improving the sintering output and quality. Since the density of blown gases such as natural gas is lighter than air, the gas has a tendency to escape upward under the influence of buoyancy during the spraying process. At the same time, the distribution uniformity of the sprayed gas on the material surface affects the heating consistency of the gas within the material layer. Existing spraying devices have not completely solved the two key problems of gas distribution uniformity and upward escape, affecting the further improvement of the carbon reduction effect of this technology and the further promotion of this technology.

[0004] Aiming at the defects existing in the existing sintering gas blowing technology, such as ① uneven mixing of gas and air and ② escape of gas to the outside of the hood, this patent provides a sintering material surface gas spraying device system, which can effectively solve the above defects of the existing sintering gas blowing and further reduce the carbon emissions in the sintering process.

[0005] Chinese Patent: A Metallurgical By-product Gas Spraying Device for Sintering (Chinese Patent No.: 202410011892.9, Publication Date: March 12, 2024), comprising: a gas blowing assembly and a blowing hood; gas blowing assemblies are provided on both side plates of the blowing hood along the longitudinal direction; the gas blowing assembly includes a distribution pipe and a branch pipe group, and the branch pipe group is provided on at least one side of the distribution pipe; the branch pipe group includes a plurality of blowing branch pipes arranged at intervals in the vertical direction, one end of the blowing branch pipe is communicated with the distribution pipe, and a plurality of blowing ports for spraying metallurgical by-product gas towards the middle of the blowing hood are arranged at intervals on the blowing branch pipe; from top to bottom, the spraying diameters of the blowing ports in the branch pipe group gradually increase.

[0006] Chinese Patent: A Metallurgical By-Product Gas Spraying Device for Sintering (Chinese Patent No.: 202410219486.1, Publication Date: July 5, 2024), comprising: a blowing hood body for covering the upper part of the sintering material layer on the sintering trolley; a spraying pipe row disposed inside the blowing hood body and provided with spraying openings for upwardly spraying metallurgical by-product gas; a reflecting plate disposed inside the blowing hood body and above the spraying pipe row; after the metallurgical by-product gas jet ejected from the spraying openings is reflected by the reflecting plate, it obliquely shoots downward from both sides of the reflecting plate towards the sintering material layer.

[0007] In the above patents, there are problems that the gas is ejected from the material surface when it is not sufficiently mixed with air, resulting in uneven concentration of the gas sprayed into the sintering material surface, thereby affecting the spraying effect. In addition, the above patents rely on the sintering suction negative pressure and the sealing between the hood body and the sintering trolley to form a micro-negative pressure area above the sintering material surface to ensure that the sprayed gas enters the material surface. However, when the permeability of the material layer is poor and the seal wears and leaks air after long-term operation, the gas (especially the hydrogen-rich gas) is likely to escape upward, causing potential safety hazards. Summary of the Invention

[0008] 1. Technical Problems to be Solved by the Invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a sintering material surface gas spraying device and method. By changing the fixed pipe row to a rotating material surface spraying pipe row and changing the co-directional forward spraying of air and gas to counter-directional reverse spraying, the present invention can effectively improve the mixing uniformity of gas and air, ensure the heating consistency of each area inside the material layer, thereby greatly improving the effect of gas blowing and strengthening sintering. A grid-type rectifying plate is provided between the material surface spraying pipe row and the flexible positive pressure top hood, preventing the escape of gas to the outside, improving the gas suction efficiency, and avoiding potential safety hazards caused by gas overflow.

[0010] 2. Technical Solutions

[0011] To achieve the above object, the technical solutions provided by the present invention are as follows:

[0012] A sintering material surface gas spraying device of the present invention comprises a blowing hood body, and a flexible positive pressure top hood is provided at the top of the blowing hood body, and a grid-type rectifying plate is installed inside the blowing hood body;

[0013] A gas transmission pipeline is provided above the flexible positive pressure top hood. One end of the gas transmission pipeline is connected to a gas source. Dynamic and static sealing sleeves are arranged at intervals on the gas transmission pipeline. The bottom of the dynamic and static sealing sleeve is connected to a rotating vertical pull pipe. A pull rod rotating mechanism is arranged on the pipeline of the rotating vertical pull pipe. The bottom of the rotating vertical pull pipe sequentially passes through the flexible positive pressure top hood and the grid-type rectifying plate and is connected to a material surface spraying pipe row;

[0014] The described material surface spraying pipe row includes an interface pipeline, a reducing horizontal pipe, an end spraying pipe, and a reflector. The interface pipeline is arranged at the center of the reducing horizontal pipe. Multiple groups of end spraying pipes are spaced apart at both ends of the reducing horizontal pipe. The root of the end spraying pipe is communicated with the reducing horizontal pipe, and a reflector is arranged at the top of the end spraying pipe.

[0015] Further, multiple groups of fans are distributed at intervals inside the flexible positive pressure top cover.

[0016] Further, the blowing cover body is arranged on the top of the sintering trolley, and an air box is arranged at the bottom of the sintering trolley.

[0017] Further, the grid-shaped flow rectifying plate is arranged between the flexible positive pressure top cover and the material surface spraying pipe row.

[0018] Further, the inner diameter of the reducing horizontal pipe gradually decreases from the center position to both ends.

[0019] Further, the end spraying pipes are symmetrically distributed on both sides of the reducing horizontal pipe with the central axis of the interface pipeline as the axis of symmetry.

[0020] Further, the reflector is in an inverted arc shape, and a number of air permeable holes are arranged on the reflector.

[0021] Further, one end of the rotary vertical pull pipe is installed on the gas transmission pipeline, and the other end of the rotary vertical pull pipe is communicated with the material surface spraying pipe row. The pull rod rotating mechanism drives the rotary vertical pull pipe and the material surface spraying pipe row to rotate along the central axis.

[0022] Further, the rotary vertical pull pipe is movably connected to the gas transmission pipeline through a dynamic and static sealing pipe sleeve and is relatively sealed.

[0023] A method for a sintering material surface gas spraying device:

[0024] The flexible positive pressure top cover is installed on the top of the blowing cover body, separating the inner cavity of the cover body from the upper environment of the cover body. Through the negative pressure generated by the rotation of the fans inside the flexible positive pressure top cover from top to bottom, the outside air is sucked into the inside of the blowing cover body. At the same time, a downward pressure is generated at the top of the cover to prevent the gas inside the cover from escaping to the outside;

[0025] The grid-shaped flow rectifying plate is installed below the flexible positive pressure top cover to rectify the air sucked in from the top of the cover into a vertically downward air flow, forming an overall downward air flow field;

[0026] The rotary vertical pull pipe, on the one hand, serves as a gas channel to transport the gas in the gas transmission pipeline into the material surface spraying pipe row. On the other hand, the pull rod rotating mechanism drives the rotary vertical pull pipe and the material surface spraying pipe row to rotate along the central axis, so that the gas is evenly distributed in the space inside the cover;

[0027] The described material surface spraying pipe row includes a reducing horizontal pipe. The interface pipeline is arranged at the central position of the reducing horizontal pipe. The end spray pipes are symmetrically distributed on both sides with the central axis of the interface pipeline as the symmetry axis. The roots of the end spray pipes are connected to the reducing horizontal pipe in a through manner. The inner diameter of the reducing horizontal pipe gradually decreases from the central position to both ends to balance the pressure at each spray pipe. The reflector is installed on the top of the end spray pipe. The reflector is set in an inverted arc shape. At the same time, a number of ventilation holes are provided on the reflector, so that part of the gas sprayed on the reflector flows back and then tangentially sprays out from the edge of the reflector and scatters, and part of the gas sprays upward from the openings of the reflector, further improving the dispersion degree of the gas, thereby increasing the uniformity of gas spraying, and at the same time reducing and avoiding the escape of gas to the outside of the hood.

[0028] 3. Beneficial effects

[0029] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0030] By changing the fixed pipe row to a rotating material surface spraying pipe row and changing the co-directional and forward spraying of air and gas to counter-directional and reverse spraying, the present invention can effectively improve the mixing uniformity of gas and air, ensure the heating consistency in each area inside the material layer, and thus greatly improve the effect of gas injection enhanced sintering. At the same time, a grid-shaped rectifying plate is arranged between the material surface spraying pipe row and the flexible positive pressure top hood, unifying the flow directions of gas and air into the vertical direction, strengthening the interaction between the air fluid and the gas fluid, further enhancing the isolation and suppression effect of the positive pressure top hood on the gas, preventing the escape of gas to the outside, improving the gas suction efficiency, and avoiding the safety hazards caused by gas overflow. Description of the drawings

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a structural diagram of the material surface spraying pipe row of the present invention;

[0033] Figure 3 It is a structural diagram of the prior art of the comparative example of the present invention.

[0034] In the figure: 1. Blowing hood; 2. Gas source; 3. Gas transmission pipeline; 4. Material surface spraying pipe row; 41. Interface pipeline; 42. Reducing horizontal pipe; 43. End spray pipe; 44. Reflector; 441. Ventilation hole; 5. Sintering trolley; 6. Wind box; 7. Flexible positive pressure top hood; 71. Fan; 8. Grid-shaped rectifying plate; 9. Rotary vertical pull pipe; 10. Dynamic and static sealing pipe sleeve; 11. Pull rod rotating mechanism. Specific implementation manners

[0035] The present invention will be further described below in conjunction with the drawings and embodiments:

[0036] Example 1

[0037] From Figure 1-2 It can be seen that a gas spraying device for the sintering material surface in this embodiment includes a blowing hood 1, the blowing hood 1 is arranged on the top of the sintering trolley 5, a wind box 6 is arranged at the bottom of the sintering trolley 5, a flexible positive pressure top cover 7 is arranged on the top of the blowing hood 1, and multiple groups of fans 71 are distributed at intervals inside the flexible positive pressure top cover 7. Through the negative pressure from top to bottom generated by the rotation of the flexible positive pressure top cover 7, the outside air is sucked into the inside of the blowing hood 1. At the same time, a downward pressure is generated at the top of the hood to prevent the gas inside the hood from escaping to the outside. A grid type rectifying plate 8 is installed on the inner side of the blowing hood 1, and the grid type rectifying plate 8 is arranged between the flexible positive pressure top cover 7 and the material surface spraying pipe row 4. The grid type rectifying plate 8 rectifies the air sucked from the top of the hood into a vertical downward air flow, forming an overall downward air flow field;

[0038] A gas delivery pipeline 3 is arranged above the flexible positive pressure top cover 7. One end of the gas delivery pipeline 3 is connected to a gas source 2. Dynamic and static sealing type pipe sleeves 10 are arranged at intervals on the gas delivery pipeline 3. The bottom of the dynamic and static sealing type pipe sleeve 10 is connected to a rotary vertical pull pipe 9. A pull rod rotating mechanism 11 is arranged on the pipeline of the rotary vertical pull pipe 9. The bottom of the rotary vertical pull pipe 9 sequentially penetrates through the flexible positive pressure top cover 7 and the grid type rectifying plate 8 and is connected to a material surface spraying pipe row 4;

[0039] To increase the gas spraying uniformity and at the same time reduce and avoid the escape of gas to the outside of the hood, the present invention proposes a structure of the material surface spraying pipe row 4 as shown in Figure 2 the figure;

[0040] The material surface spraying pipe row 4 includes an interface pipeline 41, a reducing cross pipe 42, end nozzles 43 and a reflector 44. The interface pipeline 41 is arranged at the center of the reducing cross pipe 42. Multiple groups of end nozzles 43 are arranged at intervals at both ends of the reducing cross pipe 42. The root of the end nozzle 43 is communicated with the reducing cross pipe 42. A reflector 44 is arranged at the top of the end nozzle 43.

[0041] The inner diameter of the reducing cross pipe 42 gradually decreases from the center position to both ends to balance the pressure at each nozzle. The end nozzles 43 are symmetrically distributed on both sides of the reducing cross pipe 42 with the central axis of the interface pipeline 41 as the symmetry axis.

[0042] The reflector 44 is in an inverted arc shape. A number of air permeable holes 441 are arranged on the reflector 44, so that part of the gas sprayed on the reflector 44 flows back and then sprays out tangentially from the edge of the reflector 44 and scatters, and part of the gas sprays upward from the holes of the reflector 44, further improving the dispersion degree of the gas.

[0043] One end of the rotary vertical pipe 9 is installed on the gas transmission pipeline 3, and the other end of the rotary vertical pipe 9 is communicated with the material surface spraying pipe row 4. The pull rod rotating mechanism 11 drives the rotary vertical pipe 9 and the material surface spraying pipe row 4 to rotate along the central axis.

[0044] The rotary vertical pipe 9 is movably connected to the gas transmission pipeline 3 through a static-dynamic sealing pipe sleeve 10 and is relatively sealed, ensuring that while the rotary vertical pipe 9 rotates along the central axis, an effective seal is still maintained between it and the gas transmission pipeline 3.

[0045] Compared with the prior art, the present invention newly adds components such as a flexible positive pressure top cover 7, a grid-shaped rectifying plate 8, a rotary vertical pipe 9, a static-dynamic sealing pipe sleeve 10, and a pull rod rotating mechanism 11. The flexible positive pressure top cover 7 is installed on the top of the blowing cover body 1, separating the internal cavity of the cover body from the upper environment of the cover body. Through the negative pressure generated by the rotation of the fan 71 in the flexible positive pressure top cover 7 from top to bottom, external air is sucked into the inside of the blowing cover body 1, and at the same time, a downward pressure is generated at the top of the cover to prevent the gas in the cover from escaping to the outside of the cover;

[0046] The grid-shaped rectifying plate 8 is arranged in the space between the flexible positive pressure top cover 7 and the material surface spraying pipe row 4, rectifying the air sucked in from the top of the cover into a vertically downward air flow, forming an overall downward air flow field;

[0047] On the one hand, the rotary vertical pipe 9 serves as a gas channel, transporting the gas in the gas transmission pipeline 3 into the material surface spraying pipe row 4. On the other hand, the rotary vertical pipe 9 drives the material surface spraying pipe row 4 to rotate along the central axis, enabling the gas to be evenly distributed in the space inside the cover;

[0048] The present invention makes the gas and air mix evenly, and effectively avoids the escape of gas to the outside of the cover body, further reducing the carbon emission in the sintering process. To increase the gas spraying uniformity and at the same time reduce and avoid the escape of gas to the outside of the cover body, the present invention proposes a structure of the material surface spraying pipe row 4 as shown in Figure 2 Figure;

[0049] Compared with the prior art, the gas blowing system of the present application has the following several remarkable advantages.

[0050] 1. The gas and air are evenly mixed

[0051] In the present application, the fuel gas is ejected through a rotating injection pipe row, forming a circular uniform fuel gas curtain on the material surface, which meets the uniform downward air flow field that is sucked in from the top of the hood and rectified by the grid-type rectifier plate 8. After the two are mixed with each other, they are finally sucked into the material layer; by changing the fixed pipe row to a rotating pipe row, and at the same time changing the air and fuel gas from the same-direction forward injection to the opposite-direction reverse injection, the mixing uniformity of the fuel gas and air can be effectively improved, and the heating consistency of each area inside the material layer can be ensured, thereby greatly improving the effect of gas injection enhanced sintering.

[0052] 2. Prevent gas from escaping outside the hood

[0053] In this application, a flexible positive pressure top cover 7 is provided at the top of the spray hood. Through the rotation of the fan 71, a downward micro-positive pressure is formed at the top of the hood, which prevents the gas from diffusing and escaping from the top of the hood to the outside of the hood. At the same time, a grid-type rectifier plate 8 is provided between the material surface spray pipe row 4 and the flexible positive pressure top cover 7, which unifies the flow direction of the gas and air into a vertical direction, strengthens the interaction between the air fluid and the gas fluid, and further enhances the isolation and suppression effect of the positive pressure top cover on the gas. It prevents the gas from escaping to the outside, improves the gas suction efficiency, and avoids the safety hazards caused by gas overflow.

[0054] Example 2

[0055] from Figure 1-2 It can be seen that a method of a sintering material surface fuel gas spraying device in this embodiment:

[0056] The flexible positive pressure top cover 7 is installed on the top of the spray cover body 1 to separate the internal cavity of the cover body from the upper environment of the cover body. The negative pressure from top to bottom generated by the rotation of the fan 71 in the flexible positive pressure top cover 7 sucks the outside air into the spray cover body, and at the same time generates a downward pressure at the top of the cover to prevent the gas in the cover from escaping to the outside of the cover.

[0057] The grid-type rectifying plate 8 is installed at the lower part of the flexible positive pressure top cover 7, rectifying the air sucked in from the top of the cover into a vertical downward wind flow, forming an overall downward air flow field;

[0058] On the one hand, the rotating vertical pull pipe 9 serves as a gas channel to transport the gas in the gas delivery pipeline 3 to the material surface spray pipe row 4. On the other hand, the pull rod rotation mechanism 11 drives the rotating vertical pull pipe 9 and the material surface spray pipe row 4 to rotate along the central axis to evenly spread the gas in the space inside the hood.

[0059] The described material surface spraying pipe row 4 includes a reducing horizontal pipe 42. The interface pipeline 41 is arranged at the central position of the reducing horizontal pipe 42. The end spray pipes 43 are symmetrically distributed on both sides with the central axis of the interface pipeline 41 as the axis of symmetry. The roots of the end spray pipes 43 are communicated with the reducing horizontal pipe 42. The inner diameter of the reducing horizontal pipe 42 gradually decreases from the central position to both ends to balance the pressure at each spray pipe. The reflecting plate 44 is installed on the top of the end spray pipe 43. The reflecting plate 44 is set as an inverted arc shape. At the same time, a number of ventilation holes 441 are arranged on the reflecting plate 44, so that part of the gas sprayed on the reflecting plate 44 flows back and is tangentially ejected from the edge of the reflecting plate 44 and spreads out, and part of the gas is ejected upward from the openings of the reflecting plate, further improving the dispersion degree of the gas, thereby increasing the uniformity of the gas spraying, and at the same time reducing and avoiding the escape of the gas to the outside of the hood.

[0060] Comparative Example 1

[0061] From Figure 3 It can be seen that Figure 3 is a structural schematic diagram of an existing sintering gas injection system. It mainly consists of six parts: 01 injection hood, 02 gas source, 03 gas transmission pipeline, 04 material surface spraying pipe row, 05 sintering trolley, and 06 bottom air box. The 01 injection hood is installed directly above the 05 sintering trolley, forming a cavity that is closed on all sides and open at the top above the trolley, separating the space above the trolley from the surrounding environment. The 04 spraying pipe row is evenly arranged above the sintering material surface and maintains a certain distance from the sintering material surface. The 02 gas source is connected to the 04 spraying pipe row through the 03 gas transmission pipeline. The 06 bottom air box is arranged directly below the 05 sintering trolley.

[0062] During the operation of the system, the mixture of sintering raw materials (such as iron ore powder) and solid fuel (such as coke powder) is arranged on the sintering trolley to form a sintering material layer with a certain height. There is a high-temperature combustion zone (about 1200°C) formed by the combustion of solid fuel inside the sintering material layer. The bottom air box sucks air, creating a slight negative pressure above the sintering material layer. Under the action of the negative pressure, the air at the top is sucked into the sintering material layer. After completing combustion support and heat transfer, the generated waste gas is discharged from the bottom of the air box. When the sintering gas injection is not enabled, almost all the heat required for sintering comes from the combustion of solid fuel in the material layer. When the gas injection is enabled, gaseous fuels such as natural gas or coke oven gas are sent from the gas source, pass through the gas transmission pipeline and reach the injection pipe row, and then are evenly sprayed into the space above the sintering material surface through the injection pipe row. The gas sprayed from the injection pipe row and the air inhaled from the hood top are mixed in the injection hood and then sucked into the sintering material layer by the bottom air box. The gas burns in the combustion zone of the sintering material layer, partially replacing the sintering solid fuel for heat supply, thereby achieving the purpose of reducing the consumption of sintering solid fuel and reducing carbon emissions. The generated waste gas is then discharged from the bottom air box.

[0063] Due to its significant carbon reduction effect, the existing gas injection technology is considered to be one of the most promising technologies for carbon emission reduction in the sintering process. However, since natural gas and coke oven gas are lighter than air, there is still a problem of gas escaping to the outside of the hood in the production process of the existing technical equipment, which affects the carbon reduction effect on the one hand and poses a safety hazard on the other hand. At the same time, the distribution of gas on the sintering material surface is not uniform, and the heat supply in each area inside the material layer is inconsistent, affecting the carbon reduction effect. All these problems have caused certain resistance to the popularization and application of the sintering gas injection technology.

[0064] Disadvantages of the existing technology:

[0065] Uneven mixing of gas and air, affecting the carbon reduction effect

[0066] In the existing technology, the gas is discharged from the spraying pipe in the form of a single jet and sprayed vertically downward onto the material surface. The mixing process of the gas and air is similar to free jet diffusion. However, the mixing effect of the free jet is very poor. In the center of the jet axis, the gas concentration is high, and the gas concentration decreases rapidly near the axis. The existing technology generally adopts the method of increasing the density of the end pipe row and the nozzle to improve the gas mixing effect, but this cannot fundamentally strengthen the interaction between the gas and air and improve the uniformity of the gas distribution above the material surface.

[0067] Gas escapes to the outside of the hood, posing a safety hazard

[0068] In the existing technology, to ensure sufficient extraction air volume (required by the sintering process), the top of the injection hood is set in an open form, and the driving force for the gas to enter the material surface mainly depends on the micro-negative pressure above the material surface. Since the gas density is lighter than air, it will be subject to an upward buoyancy force in the hood, so there is a tendency to escape upward. During the sintering production process, the negative pressure value above the material surface will fluctuate up and down. When the suction force provided by the negative pressure above the material surface is less than the upward buoyancy force received by the gas, the gas will float upward and finally diffuse into the external environment from the top of the hood. On the one hand, this leads to a reduction in the amount of gas sucked into the material layer, affecting the carbon reduction effect; on the other hand, the overflow of combustible gas will bring potential safety hazards.

[0069] The above has schematically described the present invention and its embodiments. This description is not restrictive, and what is shown in the drawings is only one of the embodiments of the present invention. The actual structure is not limited to this. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design a structural method and embodiments similar to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A sintering material surface gas spraying device, comprising a spraying hood (1), characterized in that: A flexible positive pressure top cover (7) is arranged on the top of the spray cover (1), and a grid-type rectifying plate (8) is installed on the inner side of the spray cover (1); A gas delivery pipeline (3) is arranged above the flexible positive pressure top cover (7), one end of the gas delivery pipeline (3) is connected to a gas source (2), a dynamic and static sealing pipe sleeve (10) is arranged at intervals on the gas delivery pipeline (3), the bottom of the dynamic and static sealing pipe sleeve (10) is connected to a rotating vertical pull pipe (9), a pull rod rotating mechanism (11) is arranged on the pipeline of the rotating vertical pull pipe (9), and the bottom of the rotating vertical pull pipe (9) passes through the flexible positive pressure top cover (7), the grid-type rectifier plate (8) in sequence, and is connected to a material surface spray pipe row (4); The material surface spraying pipe row (4) comprises an interface pipe (41), a variable diameter transverse pipe (42), a terminal nozzle (43) and a reflector (44); the interface pipe (41) is arranged at the center of the variable diameter transverse pipe (42); a plurality of groups of terminal nozzles (43) are arranged at intervals at both ends of the variable diameter transverse pipe (42); the root of the terminal nozzle (43) is connected to the variable diameter transverse pipe (42); and the top of the terminal nozzle (43) is provided with a reflector (44).

2. A sintering material surface fuel gas spraying device according to claim 1, characterized in that: A plurality of groups of fans (71) are spaced apart and distributed inside the flexible positive pressure top cover (7).

3. A sintering material surface fuel gas spraying device according to claim 1, characterized in that: The blowing hood (1) is arranged on the top of the sintering trolley (5), and a wind box (6) is arranged on the bottom of the sintering trolley (5).

4. A sintering material surface fuel gas spraying device according to claim 1, characterized in that: The grid-type rectifying plate (8) is arranged between the flexible positive pressure top cover (7) and the material surface spraying pipe row (4).

5. The sintering material surface fuel gas spraying device according to claim 1, characterized in that: The inner diameter of the variable diameter transverse tube (42) gradually decreases from the center to both ends.

6. A sintering material surface fuel gas spraying device according to claim 1, characterized in that: The terminal nozzles (43) are symmetrically distributed on both sides of the variable diameter transverse pipe (42) with the central axis of the interface pipe (41) as the symmetry axis.

7. The sintering material surface fuel gas spraying device according to claim 1, characterized in that: The reflecting plate (44) is in an inverted arc shape, and a plurality of air holes (441) are provided on the reflecting plate (44).

8. The sintering material surface fuel gas spraying device according to claim 1, characterized in that: One end of the rotating vertical pull pipe (9) is installed on the gas transmission pipeline (3), and the other end of the rotating vertical pull pipe (9) is connected to the material surface spray pipe row (4). The pull rod rotation mechanism (11) drives the rotating vertical pull pipe (9) and the material surface spray pipe row (4) to rotate along the central axis.

9. The sintering material surface fuel gas spraying device according to claim 1, characterized in that: The rotating vertical pull pipe (9) is movably connected to the gas transmission pipeline (3) via a dynamic and static sealing pipe sleeve (10) and is relatively sealed.

10. The method of the sintering material surface fuel gas spraying device according to claim 1, characterized in that: The flexible positive pressure top cover (7) is installed on the top of the spray cover body (1) to separate the internal cavity of the cover body from the upper environment of the cover body. The negative pressure from top to bottom generated by the rotation of the fan (71) in the flexible positive pressure top cover (7) sucks the outside air into the spray cover body, and at the same time generates a downward pressure at the top of the cover to prevent the gas in the cover from escaping to the outside of the cover. The grid-type rectifying plate (8) is installed at the lower part of the flexible positive pressure top cover (7), rectifying the air sucked in from the top of the cover into a vertical downward wind flow, thereby forming an overall downward air flow field; On the one hand, the rotating vertical pull pipe (9) serves as a gas passage to transport the gas in the gas delivery pipeline (3) to the material surface spray pipe row (4); on the other hand, the pull rod rotation mechanism (11) drives the rotating vertical pull pipe (9) and the material surface spray pipe row (4) to rotate along the central axis to evenly spread the gas in the space inside the hood; The surface spraying pipe row (4) comprises a variable diameter transverse pipe (42), an interface pipe (41) is arranged at the center of the variable diameter transverse pipe (42), and the terminal nozzles (43) are symmetrically distributed on both sides with the central axis of the interface pipe (41) as the symmetry axis, and the root of the terminal nozzle (43) is connected with the variable diameter transverse pipe (42); the inner diameter of the variable diameter transverse pipe (42) gradually decreases from the center to both ends to balance the pressure at each nozzle; a reflector (44) is installed on the top of the terminal nozzle (43), the reflector (44) is arranged in an inverted arc shape, and a plurality of air holes (441) are arranged on the reflector (44), so that part of the gas sprayed on the reflector (44) flows back and then sprays out tangentially from the edge of the reflector (44) and spreads out, and part of it sprays upward from the opening of the reflector, thereby further improving the dispersion degree of the gas, thereby increasing the uniformity of the gas spraying, and reducing and avoiding the escape of the gas to the outside of the cover body.

Images