A sintering machine wind box negative pressure control device

Abstract

The present invention discloses a sintering machine bellows negative pressure control device, comprising a partition plate arranged between two adjacent bellows and a pressure-reducing combination arranged on a bellows branch pipe of the sintering machine, characterized in that the pressure-reducing combination is connected with the bellows correspondingly, and the bellows are connected with a large flue through the bellows branch pipes respectively, wherein the pressure-reducing combination arranged on the bellows branch pipe comprises a throttle pipe, a negative pressure fine-tuning bypass pipe is arranged on the bellows branch pipe between the bellows and the throttle pipe, connecting the large flue and the bellows branch pipe, a negative pressure fine-tuning bypass pipe is arranged on the negative pressure fine-tuning bypass pipe, and the negative pressure fine-tuning bypass pipe cooperates with the throttle pipe to control the negative pressure in the bellows; the present invention realizes low-negative-pressure ignition by controlling the negative pressure in the bellows under the igniter of the sintering machine and the negative pressure level of the adjacent bellows, and then gradually increases the negative pressure in the subsequent bellows to the negative pressure level of the large flue, thereby ensuring the air permeability of the sintering material layer and improving the output of the sintering machine.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy and ironmaking, in particular to an iron ore sintering process, which is used for controlling the negative pressure in a sintering machine wind box. Background Art

[0002] In existing technology, the sintering machine trolley carries the sintering mix into the chamber beneath the igniter. The negative pressure within the bellows beneath the igniter is similar to that within the sintering machine's main flue, reaching a range of 14,000 Pa to 17,500 Pa. This high negative pressure rapidly compacts the sintering mix on the trolley, causing the material level on the trolley to drop by 5% to 10%. This directly impacts the permeability of the sintering material bed and, in turn, the sintering machine's production capacity. While most sintering technicians now recognize the importance of controlling the negative pressure within the several bellows at the front of the sintering machine, there is currently no feasible solution for controlling this negative pressure. Summary of the Invention

[0003] In response to the problems existing in the prior art, the purpose of the present invention is to provide a sintering machine bellows negative pressure control device, which realizes low-negative-pressure ignition by controlling the negative pressure in the bellows below the igniter of the sintering machine and the negative pressure level of the adjacent bellows, and then gradually increases the negative pressure in the subsequent bellows to the large flue negative pressure level, thereby ensuring the permeability of the material layer during the sintering process.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A sintering machine bellows negative pressure control device comprises a partition plate arranged between two adjacent bellows and a pressure reducing combination arranged on a bellows branch pipe of a sintering machine, wherein the bellows are respectively connected to a large flue through the bellows branch pipes, and is characterized in that the pressure reducing combination is respectively connected to the bellows through the bellows branch pipes, wherein the pressure reducing combination arranged on the bellows branch pipe comprises a throttle pipe, and a negative pressure fine-tuning bypass pipe is arranged between the throttle pipe and the bellows to connect the large flue and the bellows branch pipe, and a negative pressure fine-tuning bypass pipe is provided on the negative pressure fine-tuning bypass pipe, and the negative pressure fine-tuning bypass pipe cooperates with the throttle pipe to control the negative pressure in the bellows.

[0006] Furthermore, the pressure-reducing combination is respectively arranged at the lower part of the wind box below the sintering machine igniter and the lower parts of several wind boxes close to the wind box, and controls the negative pressure in the wind box to gradually increase to the negative pressure level of the large flue from near to far near the sintering machine igniter, wherein the negative pressure in the wind box under the sintering machine igniter is 5500-9000Pa.

[0007] Furthermore, the negative pressure control device in the sintering machine wind box is suitable for adjusting and controlling the negative pressure in the wind boxes in other parts of the sintering machine.

[0008] Furthermore, the diameter of the negative pressure regulating valve on the negative pressure fine-tuning bypass pipe is 120-400 mm, and the diameter of the negative pressure regulating valve matches the size of the sintering machine and the required negative pressure in the wind box.

[0009] Furthermore, the bellows branch pipe is sequentially provided with a compensator, a connecting pipe, a maintenance hand hole, a tapered contraction transition section and a throttling pipe.

[0010] Furthermore, the throttling tube includes a contraction section, a throttling section and an expansion section.

[0011] Furthermore, the cone angle of the contraction section of the throttling tube is 25°-90°, the throttling section is tubular, and its cross section is a shape that can realize the throttling function of the throttling tube, and the cone angle of the expansion section is 5°-20°.

[0012] Furthermore, the tubular cross-section of the throttling section is circular, square or elliptical.

[0013] Furthermore, the cross-sectional area of ​​the throttling section of the throttling tube is 0.03m 2 -0.3m 2 The cross-sectional area of ​​the throttling section matches the negative pressure that needs to be reduced in the wind box and the size of the sintering machine.

[0014] Furthermore, the negative pressure control device in the sintering machine bellows is provided with a partition between two adjacent bellows, the upper surface of the partition is close to the bottom beam of the sintering machine trolley, wherein the width of the upper surface of the partition is greater than the distance between two adjacent bottom beams of the sintering machine trolley.

[0015] Furthermore, the partition provided between two adjacent wind boxes has an upper surface at a distance of 0-30 mm from the bottom beam of the sintering machine trolley.

[0016] The invention provides a negative pressure control device in the wind box of a sintering machine, which is mainly used to realize low-negative-pressure ignition of the igniter of the sintering machine and prevent the sintering material layer from being suddenly compacted by the high negative pressure in the wind box, thereby reducing the permeability of the sintering material layer and achieving the purpose of increasing the output of the sintering machine.

[0017] The specific working principle is as follows: by installing a partition between adjacent bellows, cross-drafting between them is reduced. A bellows pressure-reducing assembly is installed on the bellows branch pipe, which reduces the negative pressure in the corresponding bellows by throttling, while simultaneously discharging dust and debris from the bellows. The negative pressure in the flue is used to discharge ash into the flue, preventing dust from accumulating in the bellows. A negative pressure fine-tuning bypass pipe is installed between the bellows and the throttle pipe, connecting the bellows to the flue. A negative pressure regulating valve is installed on the negative pressure fine-tuning bypass pipe. The negative pressure fine-tuning bypass pipe and the throttle pipe on the bellows branch pipe work together to precisely adjust the negative pressure in the bellows. Because each bellows in the sintering machine requires a different negative pressure, starting from the bellows below the igniter and moving forward, the negative pressure in the bellows must gradually increase to the negative pressure level in the flue. Therefore, the bellows pressure-reducing assembly installed on each bellows must match the required negative pressure in the bellows. During the forward transmission of the sintering mixture, the negative pressure increases gradually and the material surface height does not drop suddenly, ensuring that the permeability of the sintering material layer does not change much during the sintering process, thereby increasing the output of the sintering machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the sintering machine of the present invention;

[0019] Figure 2 This is a top view of the sintering machine of the present invention;

[0020] Figure 3 Schematic diagram of the cross section of the bellows of the present invention;

[0021] Figure 4 Schematic diagram of the structure of the negative pressure control device of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the throttle tube on the bellows branch pipe of the present invention.

[0023] Figure numerals: 1: bellows No. 1, 2: partition between bellows No. 1 and bellows No. 2, 3: bellows No. 2, 4: partition between bellows No. 2 and bellows No. 3, 5: bellows No. 3, 6: igniter, 7: bellows No. 4, 8 sintering machine trolley, 9 bellows branch pipe, 9-1 compensator, 9-2 connecting pipe, 9-3 maintenance hand hole, 9-4 conical contraction transition section, 9-5 throttling pipe, 9-5-1 contraction section, 9-5-2 throttling section, 9-5-3 expansion section, 10 negative pressure fine-tuning bypass pipe, 10-1 negative pressure regulating valve, 11 large flue. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the examples of the present invention. Obviously, the examples described are only part of the examples of the present invention, not all of the examples. Based on the examples in the present invention, all other implementation methods obtained by those skilled in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0025] In the description of this embodiment, terms such as "inner," "outer," "front," "rear," "left," and "right" indicating directions or positions are based on the directions or positions shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific manner. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely to distinguish similar objects and are not to be construed as implying a specific order or precedence. It should be understood that such terms are interchangeable where appropriate.

[0026] The present invention is described below with reference to examples.

[0027] A negative pressure control device in a sintering machine bellows, comprising a partition plate arranged between two adjacent bellows and a pressure-reducing combination arranged on a bellows branch pipe of a sintering machine, characterized in that the pressure-reducing combination is connected to the bellows in correspondence, and the bellows are connected to a large flue through bellows branch pipes respectively, wherein the pressure-reducing combination arranged on the bellows branch pipe comprises a throttle pipe, and a negative pressure fine-tuning bypass pipe is arranged on the bellows branch pipe between the bellows and the throttle pipe to connect the large flue and the bellows branch pipe, and a negative pressure fine-tuning bypass pipe is provided on the negative pressure fine-tuning bypass pipe, and the negative pressure fine-tuning bypass pipe cooperates with the throttle pipe to control the negative pressure in the bellows.

[0028] The present invention provides a device for controlling negative pressure within the bellows of a sintering machine. To achieve low negative pressure within the bellows below the igniter of the sintering machine, a negative pressure fine-tuning bypass pipe is installed on the bellows branch pipe near one end of the bellows, connecting the bellows to the main flue. The negative pressure fine-tuning bypass pipe is equipped with a negative pressure regulating valve. The negative pressure fine-tuning bypass pipe cooperates with a throttle pipe on the bellows branch pipe to adjust the negative pressure within the bellows. Furthermore, since the negative pressure required by each bellows of the sintering machine varies, the negative pressure within the bellows gradually increases from the first bellows at the head of the sintering machine to the level of the negative pressure within the main flue. During the forward transmission of the sintering mixture, the negative pressure gradually increases, preventing the material level from being suddenly reduced. This ensures that the permeability of the sintering material layer does not change significantly, thereby increasing the output of the sintering machine. Furthermore, the throttle pipe installed on the bellows branch pipe can reduce the negative pressure within the corresponding bellows by throttling, while simultaneously discharging dust and debris from the bellows and utilizing the negative pressure within the main flue to discharge ash into the main flue. Example

[0029] like Figure 1 、 Figure 2 、 Figure 3 As shown, the present invention provides a negative pressure control device for a sintering machine bellows, comprising a partition provided between two adjacent bellows and a pressure reducing assembly provided on a bellows branch pipe of the sintering machine. The pressure reducing assembly is connected to the bellows and is also connected to a large flue. The bellows are respectively connected to a large flue 11 through a bellows branch pipe 9, wherein the pressure reducing assembly provided on the bellows branch pipe 9 includes a throttle pipe 9-5, and a negative pressure fine-tuning bypass pipe 10 is provided near one end of the bellows branch pipe 9, which passes through the throttle pipe 9-5 and connects the large flue 11 with the bellows branch pipe 9. A negative pressure regulating valve 10-1 is provided on the negative pressure fine-tuning bypass pipe 10, and the negative pressure fine-tuning bypass pipe 10 cooperates with the throttle pipe 9-5 to control the negative pressure in the bellows.

[0030] In the above example, several windboxes and a large flue 11 are installed beneath the sintering machine trolley. Each windbox is connected to the large flue 11 via a windbox branch pipe 9. A throttle pipe 9-5 is installed near the large flue 11 on the windbox branch pipe 9, which is required to control the negative pressure within the windbox. A negative pressure fine-tuning bypass pipe 10 is installed at one end of this windbox branch pipe 9, near the windbox, and passes through the throttle pipe 9-5 to connect the large flue 11 with the windbox branch pipe 9.

[0031] In the above example, the first set of pressure reduction combinations is set at the corresponding wind box below the sintering machine igniter, which is used to control the negative pressure in the 1# wind box 1. The 2#, 3#, and 4# wind boxes close to the 1# wind box are respectively controlled and adjusted by the wind box pressure reduction combination, so that the negative pressure in the wind box gradually increases to the negative pressure level of the large flue 11. Among them, the wind box pressure reduction combination of each embodiment also includes wind box No. 1 1, wind box No. 2 3, the partition 2 between wind box No. 1 and wind box No. 2, wind box No. 3 5, the partition 4 between wind box No. 2 and wind box No. 3, and wind box No. 4 7, the partition between wind box No. 3 and wind box No. 4, and the partition between wind box No. 4 and wind box No. 5. The upper surface of the partition between the wind boxes is close to the bottom beam of the sintering machine trolley, generally leaving a gap of 0-30mm. In this embodiment, the gap between the trolley bottom beam and the surface of the wind box partition is 10mm.

[0032] In the present invention, Figure 1 、 Figure 2 As shown, the left end of the sintering machine trolley 8 is equipped with a silo, a distributor, and an igniter 6. The sintering mixture, the subsequent combustion zone, and the sintered ore are placed in the sintering machine trolley 8. Multiple bellows are arranged from left to right below the sintering machine trolley 8. Some bellows that require negative pressure reduction are equipped with a pressure reduction assembly on the bellows branch pipe. These bellows are connected to the main flue 11 through a bellows branch pipe 9 with a throttle tube and a negative pressure fine-tuning bypass pipe 10. Bellows that do not require negative pressure control are connected to the main flue 11 through the bellows branch pipe 9. The negative pressure in these bellows is basically the same as that in the main flue 11.

[0033] In the above example, a partition 2 is provided between two adjacent bellows below the sintering machine trolley 8, and the upper surface of the partition 2 is close to the bottom beam of the sintering machine trolley 8, with a gap of 10 mm between the two. The width of the partition 2 is greater than the distance between the two adjacent bottom beams of the sintering machine trolley 8. Furthermore, in this embodiment, the distance between the two adjacent bottom beams of the sintering machine trolley 8 is 450 mm, and the width of the partition 2 is 600 mm. The upper surface of the partition 2 is close to the two bottom beams, which can effectively isolate the two adjacent bellows and prevent excessive cross-flow of wind between the bellows.

[0034] The previous negative pressure in the No. 1 sintering machine windbox, corresponding to the igniter, was 17,000 Pa. In this embodiment, the negative pressure in the No. 1 sintering machine windbox, located below the igniter, was controlled between 5,500 and 9,000 Pa by throttling the flow through the throttle tube 9-5 on the windbox branch pipe 9 and adjusting the negative pressure regulating valve 10-1 on the negative pressure fine-tuning bypass pipe 10 connecting the upper end of the windbox branch pipe 9 to the main flue 11. In this embodiment, the negative pressure in the No. 1 windbox was 7,000 Pa. The negative pressure in the windboxes was adjusted similarly to 10,000 Pa in the No. 2 windbox, 13,000 Pa in the No. 3 windbox, and 15,000 Pa in the No. 4 windbox.

[0035] like Figure 3 、 Figure 4 As shown, the bellows structure in the bellows pressure reduction combination takes bellows No. 1 as an example. The upper opening of the bellows corresponds to the bottom of the sintering machine trolley 8. The axial size of the overall opening of the bellows gradually decreases from top to bottom. The bellows is connected to the large flue 11 through the bellows branch pipe 9. In this embodiment, Figure 3 As shown, the bellows as a whole is tilted to one side, and a negative pressure fine-tuning bypass pipe 10 is provided above the bellows branch pipe 9. One end of the negative pressure fine-tuning bypass pipe 10 is connected to the large flue 11, and the other end is provided at the connection between the bellows branch pipe 9 and the bellows. The negative pressure fine-tuning bypass pipe 10 is provided above the outer side of the bellows branch pipe 9. In this embodiment, the large flue 11 is provided below the bellows floor platform, and the bellows branch pipe 9 and the negative pressure fine-tuning bypass pipe 10 are connected to the large flue 11 through the bellows floor platform. In this embodiment, the structures of bellows No. 2 3, bellows No. 3 5 and bellows No. 4 7 are consistent with those of bellows No. 1 1. In the same way, the negative pressure in any bellows on the sintering machine can be controlled, for example, the negative pressure in the three bellows at the tail of the machine can be controlled.

[0036] In the above example, in order to achieve low-negative-pressure ignition of the sintering machine igniter, a negative-pressure fine-tuning bypass pipe 10 is provided on the wind box branch pipe 9 near one end of the wind box to connect the wind box and the large flue 11. A negative-pressure regulating valve 10-1 is provided on the negative-pressure fine-tuning bypass pipe 10. The negative-pressure fine-tuning bypass pipe 10 cooperates with the wind box branch pipe 9 to adjust the negative pressure in the wind box. At the same time, the negative pressure required in each wind box is different. From close to the sintering machine igniter 6 to far away from the sintering machine igniter 6, the negative pressure in the wind box gradually increases to the negative pressure level of the large flue. In the process of conveying the sintering mixture forward, the material surface height will not drop suddenly, step by step, thereby ensuring the air permeability of the sintering material layer and the production capacity of the sintering machine. In addition, installing a throttle tube on the bellows branch pipe can reduce the negative pressure in the corresponding bellows by throttling, and at the same time discharge dust and debris in the bellows. The negative pressure in the large flue is used to discharge ash into the large flue, so that dust will not be retained and compacted in the bellows, reducing the workload of cleaning the bellows. At the same time, placing the negative pressure fine-tuning bypass pipe 10 above the outer side of the bellows branch pipe 9 can reduce the wear of the negative pressure fine-tuning bypass pipe 10 by dust.

[0037] like Figure 4 、 Figure 5 As shown, the bellows branch pipe 9 is provided with a compensator 9-1, a connecting pipe 9-2, an inspection hand hole 9-3, a tapered contraction transition section 9-4 and a throttle pipe 9-5 in sequence from top to bottom, wherein the throttle pipe 9-5 includes a contraction section 9-5-1, a throttle section 9-5-2 and an expansion section 9-5-3. The throttle pipe 9-5 is provided with a throttle pipe contraction section 9-5-1 along the central axis direction. The cone angle of the throttle section 9-5-1 is 25°-90°. The throttle section 9-5-2 in this embodiment is a circular tube, and its cross-sectional area matches the required negative pressure in the bellows, and its cross-sectional area range is 0.01m 2 -0.3m 2The cone angle of the expansion section 9-5-3 is 5°-20°. In this embodiment, the cone angle a of the contraction section 9-5-1 of the throttle tube on the upper bellows branch pipe 9 of bellows No. 1 to No. 5 is 35°, the cone angle b of the expansion section 9-5-3 is 9°, the cross-sectional area of ​​the throttle section of the throttle tube is 0.03m²-0.3m², the throttle section 9-5-2 of the throttle tube of bellows No. 1 is a round tube with a diameter of 280mm and a cross-sectional area of ​​0.06m², the throttle section 9-5 of the throttle tube 9-5 of bellows No. 2 is 280mm in diameter and has a cross-sectional area of ​​0.06m². The diameter of section 9-5-2 is 340mm, and the cross-sectional area is 0.09m². The diameter of the throttling section 9-5-2 of the throttling tube of bellows No. 3 5 is 390mm, and the cross-sectional area is 0.12m². The diameter of the throttling section 9-5-2 of the throttling tube of bellows No. 4 7 is 440mm, and the cross-sectional area is 0.15m². In addition, the cross-section of the throttling section can be set to other shapes, such as rectangular or elliptical, so that the cross-sectional area of ​​the throttling section is within the range of 0.03m²-0.3m². In addition, the negative pressure regulating valve 10-1 provided on the negative pressure fine-tuning bypass pipe 10 is used to assist in adjusting the negative pressure in the bellows. In this embodiment, the diameter of the negative pressure regulating valve 10-1 on bellows No. 1 and bellows No. 2 3 is 180mm, and the diameter of the negative pressure regulating valve 10-1 on bellows No. 3 5 and bellows No. 4 7 is 250mm.

[0038] In this embodiment, during operation of the sintering machine, the sintering exhaust gas generated under the sintering machine trolley 8 is throttled by the throttle pipe 9-5 on the windbox branch pipe 9 before reaching the main flue 11. Since the throttle pipe 9-5 functions as a throttling and pressure-reducing device, the negative pressure within the windbox is reduced. For example, when the negative pressure regulating valve 10-1 on the negative pressure fine-tuning bypass pipe 10 of windbox No. 1 is closed, the negative pressure within the windbox is 7500 Pa. To increase the negative pressure within windbox No. 1 to 7000 Pa, the negative pressure regulating valve 10-1 is opened 40%, allowing some sintering exhaust gas to flow through the negative pressure regulating valve 10-1 into the main flue 11, increasing the exhaust volume of windbox No. 1 and bringing the negative pressure within windbox No. 1 to 7000 Pa. The negative pressure regulation method for other windboxes is the same as that for windbox No. 1. For windboxes that do not require pressure reduction, the windbox branch pipe 9 directly connects the windbox to the main flue, and the negative pressure within the windbox remains consistent with that of the main flue.

[0039] It should be noted that, in addition to the specific examples given above, some of the structures may have different options. For example, the cross-section of the throttle tube can be circular, square, elliptical, or other shapes, as long as the shape can achieve the throttling function of the throttle tube. These are all shapes that can be made by those skilled in the art based on their understanding of the principles of the present invention and their basic skills, so they will not be listed here one by one.

[0040] Finally, it should be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the principles and essence of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A negative pressure control device for a sintering machine windbox, comprising a partition disposed between two adjacent windboxes and a pressure reducing assembly disposed on a windbox branch pipe of the sintering machine, wherein the windboxes are connected to a large flue through the windbox branch pipes, and characterized in that: The pressure-reducing combination is respectively connected to the bellows through the bellows branch pipe, wherein the pressure-reducing combination arranged on the bellows branch pipe includes a throttle pipe, and the throttle pipe includes a contraction section, a throttle section and an expansion section. The bellows branch pipe is provided with a negative pressure fine-tuning bypass pipe at one end close to the bellows, and the large flue is connected to the bellows branch pipe via the throttle pipe. The negative pressure fine-tuning bypass pipe is arranged above the outer side of the bellows branch pipe, and a negative pressure regulating valve is provided on the negative pressure fine-tuning bypass pipe. Cooperating with the throttle tube to control the negative pressure in the bellows, the throttle tube is used for throttling and reducing pressure as well as discharging dust in the bellows. The cone angle of the contraction section of the throttle tube is 25°-90°, and the tubular cross-section of the throttle section is a shape that can realize the throttling function of the throttle tube. The cone angle of the expansion section is 5°-20°; the partition arranged between the two adjacent bellows has its upper surface close to the bottom beam of the sintering machine trolley, wherein the width of the upper surface of the partition is greater than the distance between the two adjacent bottom beams of the sintering machine trolley.

2. The sintering machine wind box negative pressure control device according to claim 1, characterized in that: The pressure-reducing assembly is respectively arranged at the lower part of the wind box below the sintering machine igniter and the lower parts of several wind boxes close to the wind box, and controls the negative pressure in the wind box to gradually increase to the negative pressure level of the large flue from near to far near the sintering machine igniter, wherein the negative pressure in the wind box under the sintering machine igniter is 5500-9000Pa.

3. The sintering machine wind box negative pressure control device according to claim 1, characterized in that: The negative pressure control device for the sintering machine wind box is also applicable to wind boxes in other parts of the sintering machine, and is used to control the negative pressure in the wind boxes in other parts.

4. The sintering machine wind box negative pressure control device according to claim 1, characterized in that: The diameter of the negative pressure regulating valve is 120-400 mm, and the diameter of the negative pressure regulating valve matches the size of the sintering machine and the required negative pressure in the wind box.

5. The sintering machine wind box negative pressure control device according to claim 1, characterized in that: The bellows branch pipe is sequentially provided with a compensator, a connecting pipe, a maintenance hand hole, a tapered contraction transition section and a throttling pipe.

6. The sintering machine wind box negative pressure control device according to claim 1, characterized in that: The tubular cross-section of the throttling section is in the shape of a circle, a rectangle or an ellipse.

7. The sintering machine wind box negative pressure control device according to claim 6, characterized in that: The cross-sectional area of ​​the throttling section of the throttling tube is 0.03m 2 -0.3m 2 The cross-sectional area of ​​the throttling section matches the size of the sintering machine and the negative pressure that needs to be reduced in the wind box.

8. The sintering machine wind box negative pressure control device according to claim 1, characterized in that: The partition provided between the two adjacent wind boxes has an upper surface and a distance from the bottom beam of the sintering machine trolley of 0-30 mm.

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