A sintering material surface gas spraying device and method

Abstract

This invention discloses a sintering material surface gas spraying device and method, belonging to the field of metallurgical sintering technology. The invention includes a spraying hood, the top of which is equipped with a flexible positive pressure top cover, and a grid-type flow straightener installed inside the spraying hood. A gas delivery pipeline is arranged above the flexible positive pressure top cover, with dynamic and static sealing sleeves spaced apart on the gas delivery pipeline. A rotating vertical pull pipe is connected to the bottom of the dynamic and static sealing sleeves, and the bottom of the rotating vertical pull pipe is connected to a material surface spraying pipe array. By replacing the fixed pipe array with a rotating material surface spraying pipe array, and changing the air and gas spraying from co-current to counter-current, this invention effectively improves the mixing uniformity of gas and air, ensures consistent heating in all areas of the material layer, and thus significantly improves the effect of gas spraying to enhance sintering.

Description

Technical Field

[0001] This invention relates to the field of metallurgical sintering technology, and more specifically, to a sintering material surface gas spraying device and method thereof. Background Technology

[0002] Sintering is a crucial step in long-process ironmaking, providing over 70% of the raw materials fed into the blast furnace. Traditional sintering primarily relies on solid fuel for heating, which is inefficient, resulting in high energy consumption and poor quality.

[0003] Spraying combustible gases onto the sintering bed to replace part of the solid fuel for heating is currently recognized as one of the most promising low-carbon sintering technologies in the industry. This involves spraying combustible gases such as natural gas or coke oven gas onto the bed after ignition, drawing them into the sintering bed for combustion and heating, thus replacing some of the solid fuel for heating. This also improves the uniformity of heating within the bed, thereby reducing solid fuel consumption and improving sintering product quality. However, because the density of injected gases such as natural gas is lighter than air, the gases tend to escape upwards due to buoyancy during spraying. Furthermore, the uniformity of the sprayed gas distribution on the bed affects the consistency of heating within the bed. Existing spraying devices have not completely solved the two key problems of uniform gas distribution and upward escape, hindering further improvement in the carbon reduction effect and the wider adoption of this technology.

[0004] In response to the shortcomings of existing sintering gas injection technology, such as ① uneven mixing of gas and air and ② gas escaping to the outside of the hood, this patent provides a sintering material surface gas spraying device system, which can effectively solve the above-mentioned defects of existing sintering gas injection technology and further reduce the carbon emissions of the sintering process.

[0005] Chinese Patent: A Sintering Metallurgical By-product Gas Spraying Device (Chinese Patent No.: 202410011892.9, Publication Date: March 12, 2024), comprising: a gas injection assembly and a spray hood, wherein the spray hood is provided with a gas injection assembly on both longitudinally arranged side plates; the gas injection assembly includes a distribution pipe and a branch pipe group, wherein at least one side of the distribution pipe is provided with a branch pipe group; the branch pipe group includes a plurality of spray branch pipes arranged vertically at intervals, one end of the spray branch pipe is connected to the distribution pipe and the spray branch pipe is provided with a plurality of spray nozzles at intervals to spray metallurgical by-product gas toward the center of the spray hood; from top to bottom, the spray diameter of the spray nozzles in the branch pipe group gradually increases.

[0006] Chinese Patent: A Spraying Device for Metallurgical By-product Gas in Sintering (Chinese Patent No.: 202410219486.1, Publication Date: July 5, 2024), comprising: a spray hood for covering the sintering material layer on a sintering trolley; a spray pipe array disposed inside the spray hood and having spray nozzles for spraying metallurgical by-product gas upwards; and a reflector plate disposed inside the spray hood and above the spray pipe array; the jet of metallurgical by-product gas ejected from the spray nozzles is reflected by the reflector plate and then obliquely downwards from both sides of the reflector plate toward the sintering material layer.

[0007] All of the aforementioned patents suffer from the problem of insufficient mixing of the gas with air before it is ejected from the sintering surface, resulting in uneven concentration of the gas injected into the sintering surface and thus affecting the injection effect. Furthermore, these patents all rely on the negative pressure of the sintering exhaust and the sealing of the hood and sintering table workshop to create a slightly negative pressure area above the sintering surface to ensure the injected gas enters the surface. However, due to poor permeability of the material layer and wear and tear of the seals after prolonged operation, the gas (especially medium-hydrogen-rich gas) can easily escape upwards, posing a safety hazard. Summary of the Invention

[0008] 1. The technical problem that the invention aims to solve

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sintering material surface gas spraying device and method. This invention improves the uniformity of gas and air mixing by changing the fixed pipe array to a rotating material surface spraying pipe array and changing the air and gas spraying from co-current to counter-current. This ensures consistent heating in all areas of the material layer, thereby significantly improving the effect of gas injection to enhance sintering. A grid-type flow rectifier is installed between the material surface spraying pipe array and the flexible positive pressure top cover to prevent gas from escaping to the outside, which improves gas extraction efficiency and avoids safety hazards caused by gas overflow.

[0010] 2. Technical Solution

[0011] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0012] The present invention provides a sintering material surface gas spraying device, comprising a spray hood, wherein a flexible positive pressure top cover is provided on the top of the spray hood, and a grid-type rectifier plate is installed on the inner side of the spray hood.

[0013] A gas delivery pipeline is installed above the flexible positive pressure top cover. One end of the gas delivery pipeline is connected to a gas source. Dynamic and static sealing sleeves are installed at intervals on the gas delivery pipeline. A rotating vertical pull pipe is connected to the bottom of the dynamic and static sealing sleeves. A pull rod rotation mechanism is installed on the rotating vertical pull pipe. The bottom of the rotating vertical pull pipe passes through the flexible positive pressure top cover and the grid-type flow rectifier plate in sequence and is connected to the material surface spray pipe row.

[0014] The material spraying pipe array includes an interface pipe, a variable diameter horizontal pipe, end spray pipes and a reflector plate. An interface pipe is provided at the center of the variable diameter horizontal pipe. Multiple sets of end spray pipes are provided at intervals at both ends of the variable diameter horizontal pipe. The root of the end spray pipe is connected to the variable diameter horizontal pipe. A reflector plate is provided at the top of the end spray pipe.

[0015] Furthermore, multiple sets of fans are spaced apart inside the flexible positive pressure top cover.

[0016] Furthermore, the blowing hood is installed on the top of the sintering trolley, and an air box is installed at the bottom of the sintering trolley.

[0017] Furthermore, the grid-type rectifier plate is disposed between the flexible positive pressure top cover and the material surface spray pipe array.

[0018] Furthermore, the inner diameter of the variable-diameter horizontal tube gradually decreases from the center to both ends.

[0019] Furthermore, the terminal nozzles are symmetrically distributed on both sides of the variable-diameter horizontal pipe with the central axis of the interface pipe as the axis of symmetry.

[0020] Furthermore, the reflector is in the shape of an inverted arc, and several ventilation holes are provided on the reflector.

[0021] Furthermore, one end of the rotary vertical pipe is installed in the gas transmission pipeline, and the other end of the rotary vertical pipe is connected to the material surface spray pipe array. The pull rod rotation mechanism drives the rotary vertical pipe and the material surface spray pipe array to rotate along the central axis.

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

[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 spray hood, which isolates the internal cavity of the hood from the environment above the hood. The negative pressure generated by the rotation of the fan inside the flexible positive pressure top cover draws outside air into the spray hood, while 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.

[0025] The grid-type rectifier is installed at the bottom of the flexible positive pressure top cover, which rectifies the air drawn in from the top of the cover into a vertical downward airflow, forming an overall downward airflow field;

[0026] The rotating vertical pipe serves as a gas channel, delivering gas from the gas pipeline to the feed surface spray pipe array. On the other hand, the pull rod rotation mechanism drives the rotating vertical pipe and the feed surface spray pipe array to rotate along the central axis, so that the gas is evenly distributed in the space inside the hood.

[0027] The aforementioned material spraying pipe array includes a variable-diameter horizontal pipe, with the interface pipe located at the center of the variable-diameter horizontal pipe. The end spray pipes are symmetrically distributed on both sides with the central axis of the interface pipe as the axis of symmetry, and the root of the end spray pipe is connected to the variable-diameter horizontal pipe. The inner diameter of the variable-diameter horizontal pipe gradually decreases from the center to both ends to balance the pressure at each spray pipe. A reflector plate is installed on the top of the end spray pipe. The reflector plate is set in an inverted arc shape, and at the same time, several vent holes are set on the reflector plate. This allows part of the gas sprayed on the reflector plate to flow back and be sprayed tangentially from the edge of the reflector plate, spreading out in all directions. Part of the gas is sprayed upward from the openings of the reflector plate, further improving the dispersion of the gas and thus increasing the uniformity of the gas spray, while reducing and preventing the gas from escaping to the outside of the hood.

[0028] 3. Beneficial effects

[0029] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0030] This invention improves the uniformity of gas-air mixing by replacing fixed pipe arrays with rotating surface spray pipe arrays and changing the air and gas spraying from co-current to counter-current. This ensures consistent heating across all areas of the material layer, significantly enhancing the sintering-strengthening effect of gas injection. Furthermore, a grid-type flow straightener is installed between the surface spray pipe arrays and the flexible positive pressure hood, unifying and straightening the gas and air flow into a vertical direction. This strengthens the interaction between the air and gas fluids, further enhancing the isolation and suppression effect of the positive pressure hood on the gas. This prevents gas escape, improving gas extraction efficiency and avoiding safety hazards caused by gas spillage. Attached Figure Description

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

[0032] Figure 2 This is a structural diagram of the material spraying pipe array of the present invention;

[0033] Figure 3 This is a comparative example of the prior art structure of the present invention.

[0034] In the diagram: 1. Spray nozzle; 2. Gas source; 3. Gas delivery pipeline; 4. Material surface spraying pipe array; 41. Interface pipeline; 42. Variable diameter horizontal pipe; 43. End spray pipe; 44. Reflector plate; 441. Vent hole; 5. Sintering trolley; 6. Air box; 7. Flexible positive pressure top cover; 71. Fan; 8. Grille-type rectifier plate; 9. Rotary vertical pull pipe; 10. Dynamic and static sealing pipe sleeve; 11. Pull rod rotation mechanism. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0036] Example 1

[0037] from Figure 1-2 As can be seen, the sintering material surface gas spraying device of this embodiment includes a spray hood 1, which is set on the top of the sintering trolley 5. A wind box 6 is set at the bottom of the sintering trolley 5. A flexible positive pressure top cover 7 is set on the top of the spray hood 1. Multiple sets of fans 71 are distributed at intervals inside the flexible positive pressure top cover 7. The negative pressure generated by the rotation of the flexible positive pressure top cover 7 draws outside air into the spray hood 1. 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. A grid-type rectifier plate 8 is installed on the inner side of the spray hood 1. The grid-type rectifier plate 8 is set between the flexible positive pressure top cover 7 and the material surface spraying pipe row 4. The grid-type rectifier plate 8 rectifies the air drawn in from the top of the cover into a vertical downward airflow, forming an overall downward airflow field.

[0038] A gas delivery pipeline 3 is installed 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 pipe sleeves 10 are installed at intervals on the gas delivery pipeline 3. A rotating vertical pull pipe 9 is connected to the bottom of the dynamic and static sealing pipe sleeve 10. A pull rod rotating mechanism 11 is installed on the pipe of the rotating vertical pull pipe 9. The bottom of the rotating vertical pull pipe 9 passes through the flexible positive pressure top cover 7 and the grid-type flow plate 8 in sequence and is connected to the material surface spray pipe row 4.

[0039] To increase the uniformity of gas spraying and reduce and prevent gas escape to the outside of the enclosure, this invention proposes the following... Figure 2 The material spraying pipe array 4 shown is structurally complete;

[0040] The material surface spray pipe array 4 includes an interface pipe 41, a variable diameter horizontal pipe 42, an end spray pipe 43, and a reflector plate 44. The interface pipe 41 is provided at the center of the variable diameter horizontal pipe 42. Multiple sets of end spray pipes 43 are provided at intervals at both ends of the variable diameter horizontal pipe 42. The root of the end spray pipe 43 is connected to the variable diameter horizontal pipe 42. The top of the end spray pipe 43 is provided with a reflector plate 44.

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

[0042] The reflector plate 44 is an inverted arc shape, and several vent holes 441 are provided on the reflector plate 44. This allows part of the gas injected onto the reflector plate 44 to flow back and be ejected tangentially from the edge of the reflector plate 44, spreading out in all directions. Another part is ejected upward from the openings of the reflector plate 44, further improving the dispersion of the gas.

[0043] One end of the rotary vertical pipe 9 is installed in the gas transmission pipeline 3, and the other end of the rotary vertical pipe 9 is connected to the material surface spray pipe 4. The pull rod rotation mechanism 11 drives the rotary vertical pipe 9 and the material surface spray pipe 4 to rotate along the central axis.

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

[0045] Compared with the prior art, the present invention adds a flexible positive pressure top cover 7, a grid-type rectifier plate 8, a rotary vertical pull tube 9, a dynamic and static sealing pipe sleeve 10, 11, and a pull rod rotation mechanism, etc. The flexible positive pressure top cover 7 is installed on the top of the spray hood 1, separating the internal cavity of the hood from the environment above the hood. The negative pressure generated by the rotation of the fan 71 inside the flexible positive pressure top cover 7 draws outside air into the spray hood 1, while generating a downward pressure at the top of the hood to prevent the gas inside the hood from escaping to the outside.

[0046] The grid-type rectifier plate 8 is set in the space between the flexible positive pressure top cover 7 and the material surface spray pipe row 4. It rectifies the air drawn in from the top of the cover into a vertical downward airflow, forming an overall downward airflow field.

[0047] The rotating vertical pull pipe 9 serves as a gas passage, delivering gas into the gas delivery pipeline 3 and spraying it onto the feed surface 4. On the other hand, the rotating vertical pull pipe 9 drives the feed surface spraying pipe 4 to rotate along the central axis, so that the gas is evenly distributed in the space inside the hood.

[0048] This invention ensures uniform mixing of fuel gas and air, effectively preventing fuel gas escape from the enclosure and further reducing carbon emissions during the sintering process. To increase the uniformity of fuel gas spraying while reducing and preventing fuel gas escape from the enclosure, this invention proposes the following... Figure 2 The material spraying pipe array 4 shown is structurally complete;

[0049] Compared with the prior art, the gas injection system of this application has the following significant advantages.

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

[0051] In this application, the gas is ejected through a rotating jet pipe array, forming a circular and uniform gas curtain on the material surface. This curtain encounters the uniform downward airflow drawn in from the top of the hood and rectified by the grid-type rectifier plate 8. After mixing, the gas is finally drawn into the interior of the material layer. By changing the fixed pipe array to a rotating pipe array, and changing the co-current injection of air and gas to counter-current injection, the uniformity of the mixing of gas and air can be effectively improved, ensuring the heat supply consistency of each area inside the material layer, thereby significantly improving the effect of gas injection to strengthen sintering.

[0052] 2. Prevents the escape of gas from the outside of the enclosure.

[0053] In this application, a flexible positive pressure hood 7 is installed on the top of the spray hood. A fan 71 rotates, creating a downward micro-positive pressure on the top of the hood, preventing the gas from diffusing and escaping from the top of the hood. Simultaneously, a grid-type flow straightener 8 is installed between the material surface spray pipe array 4 and the flexible positive pressure hood 7, unifying and straightening the flow of gas and air into a vertical direction. This strengthens the interaction between the airflow and the gas flow, further enhancing the isolation and suppression effect of the positive pressure hood on the gas. This prevents the gas from escaping to the outside, improving gas extraction efficiency and avoiding safety hazards caused by gas overflow.

[0054] Example 2

[0055] from Figure 1-2 As can be seen, this embodiment describes a method for a sintering material surface gas spraying device:

[0056] The flexible positive pressure top cover 7 is installed on the top of the spray hood 1, which separates the internal cavity of the hood from the environment above the hood. The negative pressure generated by the rotation of the fan 71 inside the flexible positive pressure top cover 7 draws outside air into the spray hood, while generating a downward pressure on the top of the hood to prevent the gas inside the hood from escaping to the outside.

[0057] The grid-type rectifier plate 8 is installed at the lower part of the flexible positive pressure top cover 7, which rectifies the air drawn in from the top of the cover into a vertical downward airflow, forming an overall downward airflow field.

[0058] The rotating vertical pipe 9 serves as a gas passage, delivering gas into the gas delivery pipeline 3 and spraying the feed surface pipe 4. On the other hand, the pull rod rotating mechanism 11 drives the rotating vertical pipe 9 and the feed surface spraying pipe 4 to rotate along the central axis, so that the gas is evenly distributed in the space inside the hood.

[0059] The material spraying pipe array 4 includes a variable diameter horizontal pipe 42, an interface pipe 41 located at the center of the variable diameter horizontal pipe 42, and end spray pipes 43 symmetrically distributed on both sides with the central axis of the interface pipe 41 as the axis of symmetry. The root of the end spray pipes 43 is connected to the variable diameter horizontal pipe 42. The inner diameter of the variable diameter horizontal pipe 42 gradually decreases from the center to both ends to balance the pressure at each spray pipe. A reflector plate 44 is installed on the top of the end spray pipes 43. The reflector plate 44 is set in an inverted arc shape. At the same time, several vent holes 441 are provided on the reflector plate 44 so that part of the gas sprayed on the reflector plate 44 flows back and is sprayed out tangentially from the edge of the reflector plate 44, spreading out in all directions. Part of the gas is sprayed upward from the opening of the reflector plate, further improving the dispersion of the gas and thus increasing the uniformity of the gas spray, while reducing and preventing the gas from escaping to the outside of the hood.

[0060] Comparative Example 1

[0061] from Figure 3 It can be seen that, Figure 3 This is a simplified structural diagram of an existing sintering gas injection system. It mainly consists of six parts: 01 injection hood, 02 gas source, 03 gas delivery pipeline, 04 material surface spray pipe array, 05 sintering trolley, and 06 bottom air box. The 01 injection hood is installed directly above the 05 sintering trolley, forming a closed cavity with an open top, isolating the space above the trolley from the surrounding environment. The 04 spray pipe array is evenly distributed above the sintering material surface, maintaining a certain distance from it. The 02 gas source is connected to the 04 spray pipe array via the 03 gas delivery pipeline. The 06 bottom air box is located directly below the 05 sintering trolley.

[0062] During system operation, a mixture of sintering raw materials (such as iron concentrate) and solid fuels (such as coke powder) is arranged on the sintering trolley, forming a sintering material layer of a certain height. Inside the sintering material layer, there exists a high-temperature combustion zone (approximately 1200℃) formed by the combustion of solid fuels. Air is drawn in from the bottom bellows, creating a slight negative pressure above the sintering material layer. Under this negative pressure, air from the top is drawn into the sintering material layer, completing combustion and heat transfer, and the resulting exhaust gas is discharged from the bottom of the bellows. When sintering gas injection is not activated, almost all the heat required for sintering comes from the combustion of solid fuels in the material layer. When gas injection is activated, natural gas or coke oven gas, or other gaseous fuels, are supplied from the gas source, pass through the gas delivery pipeline to the injection pipe array, and are then evenly sprayed into the space above the sintering material surface via the injection pipe array. The gas ejected from the injection pipe array and the air drawn in from the top of the hood mix inside the injection hood and are then drawn into the sintering material layer by the bottom bellows. The combustion gas burns within the combustion zone of the sintering material layer, partially replacing the sintering solid fuel for heating, thereby reducing the consumption of sintering solid fuel and carbon emissions. The resulting exhaust gas is discharged from the bottom air box.

[0063] Existing gas injection technology is considered one of the most promising carbon reduction technologies in the sintering process due to its significant carbon reduction effect. However, since natural gas and coke oven gas are lighter than air, existing equipment still suffers from gas escape from the sintering chamber during production. This affects both the carbon reduction effect and poses safety hazards. Furthermore, the uneven distribution of gas on the sintering material surface and inconsistent heat supply within the material layer further hinder carbon reduction. These issues have created obstacles to the promotion and application of sintering gas injection technology.

[0064] Disadvantages of existing technology:

[0065] Uneven mixing of fuel gas and air affects carbon reduction.

[0066] In existing technologies, fuel gas is injected downwards into the material surface in the form of a single jet from a spray nozzle array. The mixing process of the fuel gas and air approximates free jet diffusion. However, the mixing effect of free jets is poor; the fuel gas concentration is high at the center of the jet axis, but drops rapidly near the axis. Existing technologies generally improve the fuel gas mixing effect by increasing the density of the end nozzle array and nozzles, but this does not fundamentally enhance the interaction between the fuel gas and air or improve the uniformity of fuel gas distribution above the material surface.

[0067] Gas escapes outside the enclosure, posing a safety hazard.

[0068] In existing technologies, to ensure sufficient airflow (as required by the sintering process), the top of the blower hood is designed as an opening, and the power for the gas to enter the material surface mainly relies on the slight negative pressure above the material surface. Since the gas is less dense than air, it experiences an upward buoyancy within the hood, thus tending to escape upwards. During the sintering process, the negative pressure above the material surface fluctuates. When the suction force provided by the negative pressure above the material surface is less than the upward buoyancy of the gas, the gas will float upwards and eventually diffuse from the top of the hood into the external environment. This results in a reduction in the amount of gas drawn into the material layer, affecting carbon reduction; furthermore, the spillage of combustible gases poses a potential safety hazard.

[0069] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A sintering material surface gas spraying device, comprising a spray hood (1), characterized in that: The top of the blow hood (1) is provided with a flexible positive pressure top cover (7), and a grid-type rectifier plate (8) is installed on the inner side of the blow hood (1). A gas delivery pipeline (3) is provided 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 sleeves (10) are provided at intervals on the gas delivery pipeline (3). A rotating vertical pull pipe (9) is connected to the bottom of the dynamic and static sealing sleeve (10). A pull rod rotating mechanism (11) is provided on the pipeline of the rotating vertical pull pipe (9). The bottom of the rotating vertical pull pipe (9) passes through the flexible positive pressure top cover (7) and the grid-type rectifier plate (8) in sequence and is connected to the material surface spray pipe row (4). The material surface spray pipe array (4) includes an interface pipe (41), a variable diameter horizontal pipe (42), an end spray pipe (43), and a reflector plate (44). The interface pipe (41) is provided at the center of the variable diameter horizontal pipe (42). Multiple sets of end spray pipes (43) are provided at intervals at both ends of the variable diameter horizontal pipe (42). The root of the end spray pipe (43) is connected to the variable diameter horizontal pipe (42). The top of the end spray pipe (43) is provided with a reflector plate (44).

2. The sintering material surface gas spraying device according to claim 1, characterized in that: The flexible positive pressure top cover (7) has multiple sets of fans (71) distributed at intervals inside.

3. The sintering material surface gas spraying device according to claim 1, characterized in that: The blower hood (1) is set on the top of the sintering trolley (5), and the bottom of the sintering trolley (5) is provided with a blower box (6).

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

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

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

7. The sintering material surface gas spraying device according to claim 1, characterized in that: The reflector (44) is an inverted arc shape, and several ventilation holes (441) are provided on the reflector (44).

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

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

10. The method of a sintering material surface 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 hood (1) to separate the internal cavity of the hood from the upper environment of the hood. The negative pressure generated by the rotation of the fan (71) inside the flexible positive pressure top cover (7) draws the outside air into the spray hood and generates a downward pressure on the top of the hood to prevent the gas inside the hood from escaping to the outside. The grid-type rectifier (8) is installed at the lower part of the flexible positive pressure top cover (7), which rectifies the air drawn in from the top of the cover into a vertical downward airflow, forming an overall downward airflow field; The rotating vertical pipe (9) serves as a gas passage, delivering gas into the gas delivery pipeline (3) and spraying the feed surface pipe (4). On the other hand, the pull rod rotating mechanism (11) drives the rotating vertical pipe (9) and the feed surface spraying pipe (4) to rotate along the central axis, so that the gas is evenly distributed in the space inside the cover. The material spray pipe array (4) includes a variable diameter horizontal pipe (42), an interface pipe (41) is set at the center of the variable diameter horizontal pipe (42), and the end spray pipe (43) is symmetrically distributed on both sides with the central axis of the interface pipe (41) as the axis of symmetry. The root of the end spray pipe (43) is connected to the variable diameter horizontal pipe (42). The inner diameter of the variable diameter horizontal pipe (42) gradually decreases from the center to both ends to balance the pressure at each spray pipe. The reflector plate (44) is installed on the top of the end spray pipe (43). The reflector plate (44) is set in an inverted arc shape. At the same time, several vent holes (441) are set on the reflector plate (44) so ​​that part of the gas sprayed on the reflector plate (44) flows back and sprays out tangentially from the edge of the reflector plate (44) and disperses. Part of the gas sprays out upward from the opening of the reflector plate, further improving the dispersion of the gas and thus increasing the uniformity of the gas spray, while reducing and avoiding the escape of the gas to the outside of the cover.

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