Gas injection side sealing device of sintering machine

Abstract

The invention discloses a sintering machine gas injection side sealing device which comprises a sintering trolley and an injection cover, the injection cover covers the sintering trolley, combustion gas is introduced into the top of the injection cover through an injection device, and a top sealing device and a lower sealing device are arranged on the two sides of the injection cover and used for sealing the injection cover and the sintering trolley. Displacement allowance is arranged between the top sealing device and the sintering pallet, and the lower sealing device and the sintering pallet are in flexible sealing connection. According to the coal gas injection side sealing device of the sintering machine, the corresponding defects in the prior art can be effectively overcome through the coal gas injection cover side sealing device, and compared with the prior art, the coal gas injection side sealing device is more stable, more reliable, convenient to replace and better in sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering, and specifically to a sealing device for the gas injection side of a sintering machine. Background Art

[0002] The sintering process is a key link in the iron-making process. Its principle is to mix various powdered iron-containing raw materials with appropriate amounts of fuel and flux, add an appropriate amount of water, and after mixing and pelletizing, make the materials undergo a series of physical and chemical changes on the sintering equipment to sinter into blocks, which are then sent to the blast furnace for the next process.

[0003] In order to reduce the coke ratio and smelting cost of blast furnace iron-making, the blast furnace usually requires high strength and high reducibility of sinter. In the sintering process, it is generally required that the sinter has high strength, high yield, low return ore rate, and low fuel consumption. Sinter with high strength and high reducibility consumes less coke during the blast furnace smelting process, thereby reducing carbon dioxide emissions. Considering from a long-term perspective, the requirement for carbon dioxide emission reduction will become one of the bottlenecks restricting the development of the steel industry. According to relevant information, the carbon dioxide emissions of the sintering and blast furnace processes account for about 60% of the total industrial emissions. Therefore, whether considering from the perspective of enterprises reducing costs or from environmental protection, reducing the proportion of solid fuel consumption in sintering and reducing the fuel ratio of blast furnace burden have become urgent needs in iron-making technology.

[0004] In this general environment, the "gas fuel injection technology for sintering material surface" developed by JFE Company in Japan emerged as the times require. Its principle is to inject gas fuel diluted below the lower limit of the combustible concentration above the sintering pallet at a certain distance behind the ignition furnace through an injection device, so that it burns and supplies heat in the sintering material layer. This technology can reduce the consumption of solid carbon and CO2 emissions in sinter production. At the same time, since the combustion of gas fuel widens the width of the high-temperature zone during sinter production, the sintering temperature time at 1200 - 1400 °C is extended, thus effectively enhancing the strength of the sinter and the porosity of 5 - 10 mm. Currently, this technology has good energy-saving, emission-reduction, and quality-improving effects, and will have good market development potential in the future. The present invention also elaborates on this technology.

[0005] The structure of the injection device under the existing technology is shown in Figure 1As shown in the figure: The injection device consists of an injection main pipe, injection branch pipes, an injection pipe row, an injection hood and side seals. One end of the injection main pipe is connected to the plant gas pipeline, and the other end is connected to the injection pipe row through the injection branch pipes. The injection pipe row is located inside the injection hood and above the sintering machine trolley. During production, gas enters the injection main pipe from the plant gas pipeline, then enters the injection branch pipes, and finally enters the injection pipe row and is ejected. It mixes with air inside the injection hood to form a mixed gas with the designed concentration, enters the sintering material layer to assist sintering. The side seals can effectively ensure that the mixed gas of gas and air inside the hood will not overflow outside the hood. Figure 4 and Figure 5 Summary of the Invention

[0006] The purpose of the present invention is to provide a side seal device for sintering machine gas injection to solve the problems raised in the above background technology.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A side seal device for sintering machine gas injection, including a sintering trolley and an injection hood covering the sintering trolley. Combustion gas is introduced into the injection hood through an injection device at the top of the injection hood. It is characterized in that: Both sides of the injection hood are provided with a top seal device and a lower seal device for sealing the injection hood and the sintering trolley. There is a displacement allowance between the top seal device and the sintering trolley, and the lower seal device is flexibly sealed and connected to the sintering trolley.

[0008] Preferably, there are guardrails on both sides of the sintering trolley. The guardrail includes a small guardrail and a large guardrail that are fixedly connected to each other. The small guardrail is located at the top of the large guardrail. There are side columns on both sides of the injection cover, and there are two opposite side walls inside the injection cover. The injection device includes a gas injection branch pipe that penetrates the injection hood and is connected to a gas injection pipe row. The gas injection pipe row is located inside the injection hood and the gas delivery end of the gas injection pipe row is connected to a nozzle.

[0009] Preferably, the top seal device includes a horizontal bottom plate and an inclined plate. One end of the inclined plate and the horizontal bottom plate are fixedly connected to each other, and the other ends are both fixed to the side wall.

[0010] Preferably, the height of the bottom of the horizontal bottom plate from the top surface of the small guardrail is greater than the δ value (the maximum displacement value δ of the change in the top surface height of the small guardrail of the trolley caused by arching of the sintering trolley inside the injection hood, unit: mm), and there is a clearance allowance of 5 - 7 mm.

[0011] The horizontal distance between the horizontal bottom plate and the fixed end of the side wall from the inner wall of the small railing is greater than the ζ value (the maximum displacement value ζ of the unilateral deviation of the sintering trolley, unit: mm), and there is a margin of 5 - 8 mm;

[0012] The distance between the inner wall of the side wall and the outer wall of the top edge of the small railing is greater than the γ value (the maximum displacement value γ of the unilateral deviation of the sintering trolley plus the inclination of the small railing, unit: mm);

[0013] The included angle between the inclined plate and the horizontal bottom plate is set to be 45° - 55°.

[0014] Preferably, the lower sealing device includes a three - dimensional super membrane brush sealing mechanism and a spring pressing mechanism. The three - dimensional super membrane brush sealing mechanism includes a three - dimensional super membrane brush sealing body. The top of the three - dimensional super membrane brush sealing body is fixed to the rib plate on the side wall, and the bottom is pressed against the connection between the small railing and the large railing by the spring pressing mechanism.

[0015] Preferably, the three - dimensional super membrane brush sealing mechanism further includes a connecting angle steel and a plurality of connecting ear plates. The three - dimensional super membrane sealing body is fixed on one long side of the connecting angle steel, and the connecting ear plates are fixed on the other long side of the connecting angle steel. The middle of the connecting angle steel is fixed to the side wall by bolt one, and a wedge is inserted into the connecting ear plate to prevent the connecting angle steel from loosening.

[0016] Preferably, the three - dimensional super membrane brush sealing body is a combination of multiple layers of steel brushes and high - temperature resistant cloth.

[0017] Preferably, the spring pressing mechanism includes a base fixed to the side column by bolt two, a pressing device chamber fixed to the base, a spring and a piston body inserted into the pressing device chamber. One side of the piston body is fixed with a connecting rod one, and the other side abuts against the spring. The connecting rod one is fixedly connected to the connecting rod two by bolt three, and the other end of the connecting rod two is fixedly connected with a pressing plate, and the pressing plate presses against the connection between the small railing and the large railing.

[0018] Preferably, the two ends of the pressing plate are provided with arcs.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] A side sealing device for gas injection of a sintering machine according to the present invention can effectively solve the corresponding defects of the prior art through the side sealing device of the gas injection hood. While ensuring the sealing effect, it can realize the diversion and shaping of the injection flow fields on both sides ( Figure 5 as shown), effectively reducing the edge effect on both sides during the sintering process. It is more stable, reliable and convenient to replace compared with the prior art, and has a better sealing effect. Compared with the case without a side sealing device, after implementation, the drum strength of the sintered ore is improved; the finished product rate of the sintered ore is increased, and the solid fuel consumption of sintering is reduced year - on - year, and the effect of improving quality and reducing consumption is more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a side view of the present invention;

[0022] Figure 2 is Figure 1 a partial schematic view of;

[0023] Figure 3 a schematic view of a three-dimensional super film brush sealing mechanism;

[0024] Figure 4 is the velocity vector cloud diagram effect of the blowing flow field on the sintering material surface without a side sealing device;

[0025] Figure 5 is the velocity vector cloud diagram effect of the blowing flow field on the sintering material surface with a side sealing device;

[0026] Figure 6 is a schematic view of the pressing plate structure;

[0027] Figure 7 is a schematic view of the side sealing device for gas injection on a conventional sintering machine.

[0028] In the figure: 1, gas injection branch pipe; 2, gas injection pipe row; 3, nozzle; 4, side wall; 5, top sealing device; 501, inclined plate; 502, horizontal bottom plate; 6, lower sealing device; 7, side column; 8, spring pressing mechanism; 9, railing; 10, small railing; 11, large railing; 12, rib plate; 13, bolt 1; 14, connecting ear plate; 15, wedge; 16, three-dimensional super film brush sealing body; 17, connecting angle steel; 18, base; 19, bolt 2; 20, spring; 21, pressing device chamber; 22, piston body; 23, connecting rod 1; 24, connecting rod 2; 25, bolt 3; 26, pressing plate. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Such as Figure 1 and 2As shown in the figure, the coke oven gas injection device for the sintering material surface mainly includes a sintering trolley, an injection hood, and an injection device. The injection device includes a coke oven gas injection branch pipe 1 and a gas injection pipe row 2. The sintering trolley is located inside the injection hood. The gas injection branch pipe 1 is arranged outside the injection hood and connected to the external main pipe, and the gas injection pipe row 2 is arranged inside the injection hood above the sintering trolley. One end of the gas injection branch pipe 1 is connected to the coke oven gas injection main pipe and the other end is connected to the gas injection pipe row 2. There are 6 - 20 injection holes arranged on each gas injection pipe row, and nozzles 3 are installed on the injection holes. Generally, the above-mentioned coke oven gas injection area is set at a safe distance of one wind box length behind the ignition and heat preservation furnace. The area covered by the coke oven gas injection is set within the range of 15% - 40% (from the head to the tail) of the effective length L of the sintering machine.

[0031] The above-mentioned side sealing device for the sintering machine gas injection includes a top sealing device 5 fixed to the inner sides of the side walls 4 on both sides of the injection hood and a lower sealing device 6 fixed to the inner sides of the side walls 4 on both sides of the injection hood.

[0032] Specifically, the top sealing device 5 is composed of a horizontal bottom plate 502 welded to the side walls 4 on both sides of the injection hood and an inclined plate 501. The inclined plate 501 is welded to the other end of the horizontal bottom plate 502 as a whole.

[0033] Obtain the maximum displacement value δ (unit: mm) of the top surface height change of the trolley small railing 10 due to arching inside the injection hood of the sintering trolley, the maximum displacement value ζ (unit: mm) of the unilateral deviation of the sintering trolley, and the maximum displacement value γ (unit: mm) of the unilateral deviation of the sintering trolley and the inclination of the small railing 10.

[0034] Furthermore, the distance between the inner wall of the side wall 4 of the injection hood and the outer wall of the top edge of the small railing 10 of the sintering trolley is greater than the value of γ.

[0035] The bottom height of the horizontal bottom plate 502 of the top sealing device 5 is greater than the value of δ from the top surface of the small railing 10 of the sintering trolley (when there is no arching normally) and there is a clearance margin of 5 - 7 mm.

[0036] Furthermore, the horizontal distance between the other end of the horizontal bottom plate 502 of the top sealing device 5 and the inner wall of the small railing 10 is greater than the value of ζ and there is a margin of 5 - 8 mm.

[0037] Furthermore, the included angle between the upper inclined plate 501 and the horizontal bottom plate 502 of the above-mentioned top sealing device 5 is set to 45° - 55°.

[0038] The top sealing device 5 can play a certain sealing function, and at the same time can shunt and shape the injection flow fields at both edges, effectively reducing the edge effects on both sides during the sintering process.

[0039] Such as Figure 3As shown, the lower sealing device 6 is composed of a three-dimensional super membrane brush sealing mechanism and a spring pressing mechanism 8.

[0040] In the three-dimensional super membrane brush sealing mechanism, there is a three-dimensional super membrane brush sealing body 16. The three-dimensional super membrane brush sealing body 16 is fixed on the connecting angle steel 17. A plurality of connecting ear plates 14 are arranged on the connecting angle steel 17.

[0041] The connecting angle steel 17 is fixedly connected to the rib plates 12 on both sides of the inner side wall 4 of the blowing hood through bolts 13. The wedge 15 is inserted into the connecting ear plate 14 to completely fix the position of the connecting angle steel 17.

[0042] The three-dimensional super membrane brush sealing body 16 is a combination of multiple layers of steel brushes and high-temperature resistant cloth, with good sealing performance and wear resistance. The bottom of the three-dimensional super membrane brush sealing body 16 is fixedly connected to one side edge of the connecting angle steel 17. A number of connecting ear plates 14 are evenly distributed below the connecting angle steel 17, facilitating the fastening of the entire sealing device during installation.

[0043] The lower end of the three-dimensional super membrane brush sealing body 16 presses against the outer side of the joint surface of the trolley small railing 10 and the trolley large railing 11 through the action of the spring pressing mechanism 8 on the pressing plate 26, realizing the side sealing on both sides of the blowing hood.

[0044] The length of the pressing plate 26 is equal to the length of the sintering trolley, and both ends of the pressing plate 26 are transitioned by arc plates of 10° - 15°, so that the sintering trolley will not be lifted when it runs due to the misalignment of adjacent trolleys.

[0045] The height of the pressing plate 26 is consistent with the height of the joint surfaces at both ends of the sintering trolley small railing 10 and the sintering trolley large railing 11.

[0046] The spring pressing device is composed of a base 18, a pressing device chamber 21, a spring 20, and a piston body 22.

[0047] One pressing device corresponds to each end of each pressing plate 26.

[0048] The base of the above-mentioned pressing device is fixedly connected to the corresponding blowing hood side column 7 through bolts 19.

[0049] The other end of the piston body 22 of the above-mentioned pressing device is connected to the connecting rod 1 23, and is connected to the connecting rod 2 24 through bolts 25. The other end of the connecting rod 2 24 is welded to the pressing plate 26.

[0050] The stroke of the above-mentioned spring pressing mechanism 8 is greater than the maximum displacement value ζ of the unilateral deviation of the sintering trolley and has a margin of 5 - 10 mm. In the case of the deviation of the sintering trolley, the lower ends of the three-dimensional super membrane brush sealing body 16 can be pressed on both sides to achieve side sealing.

[0051] By removing the bolt three 25 at the connecting rod one 23 and the connecting rod two 24, the connecting rod two 24 and the pressing plate 26 can be removed. At the same time, the above-mentioned inclined wedge 15 and the bolt one 13 are removed for replacement after wear of the three-dimensional super film brush seal body 16. It can achieve online replacement and the operation is relatively simple.

[0052] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing device for the gas injection side of a sintering machine, comprising a sintering trolley, a blowing hood covering the outside of the sintering trolley, and a combustion gas being introduced into the top of the blowing hood through a blowing device, characterized in that: Top sealing devices (5) and lower sealing devices (6) are provided on both sides of the blowing hood for sealing the blowing hood and the sintering trolley. A displacement allowance is provided between the top sealing device (5) and the sintering trolley, and a flexible sealing connection is provided between the lower sealing device (6) and the sintering trolley.

2. The sintering machine gas injection side sealing device according to claim 1, characterized in that: On both sides of the sintering trolley, there are retaining plates (9). The retaining plate (9) includes a small retaining plate (10) and a large retaining plate (11) that are fixed to each other. The small retaining plate (10) is located at the top of the large retaining plate (11). On both sides of the blowing cover, there are side columns (7). Inside the blowing cover, there are two opposite side walls (4). The blowing device includes a gas blowing branch pipe (1). The gas blowing branch pipe (1) penetrates through the blowing hood and is connected to a gas blowing pipe row (2). The gas blowing pipe row (2) is located inside the blowing hood, and the gas supply end of the gas blowing pipe row (2) is connected to a nozzle (3).

3. The sintering machine gas injection side sealing device according to claim 2, characterized in that: The top sealing device includes a horizontal bottom plate (502) and an inclined plate (501). One end of the inclined plate (501) and the horizontal bottom plate (502) are fixed to each other, and the other ends are both fixed to the side wall (4).

4. The sintering machine gas injection side sealing device according to claim 3, characterized in that: The height of the bottom of the horizontal bottom plate (502) from the top surface of the small retaining plate (10) (when there is no arching normally) is greater than the δ value (the maximum displacement value δ of the height change of the top surface of the trolley small retaining plate caused by arching of the sintering trolley in the blowing hood, unit: mm), and a clearance allowance of 5 - 7 mm is left. The horizontal distance between the fixed end of the horizontal bottom plate (502) and the side wall (4) from the inner wall of the small retaining plate (10) is greater than the ζ value (the maximum displacement value ζ of the unilateral deviation of the sintering trolley, unit: mm), and a margin of 5 - 8 mm is left. The distance between the inner wall of the side wall (4) and the outer wall of the top edge of the small retaining plate (10) is greater than the γ value (the maximum displacement value γ of the unilateral deviation of the sintering trolley plus the inclination of the small retaining plate, unit: mm). The included angle between the inclined plate (501) and the horizontal bottom plate (502) is set to 45° - 55°.

5. The sintering machine gas injection side sealing device according to claim 2, wherein: The lower sealing device (6) includes a three-dimensional super membrane brush sealing mechanism and a spring pressing mechanism (8). The three-dimensional super membrane brush sealing mechanism includes a three-dimensional super membrane brush sealing body (16). The top of the three-dimensional super membrane brush sealing body (16) is fixed to the rib plate (12) on the side wall (4), and the bottom is pressed against the connection part of the small retaining plate (10) and the large retaining plate (11) by the spring pressing mechanism (8).

6. The sintering machine gas injection side sealing device according to claim 5, characterized in that: The three-dimensional super membrane brush sealing mechanism further includes a connecting angle steel (17) and a plurality of connecting ear plates (14). The three-dimensional super membrane sealing body (16) is fixed on one long side of the connecting angle steel (17), and the connecting ear plates (14) are fixed on the other long side of the connecting angle steel (17). The middle part of the connecting angle steel (17) is fixed to the side wall (4) by a bolt one (13). A wedge (15) is inserted into the connecting ear plate (14) to prevent the connecting angle steel (17) from loosening.

7. The sintering machine gas injection side sealing device according to claim 6, characterized in that: The three-dimensional super membrane brush sealing body (16) is a combination of multiple layers of steel brushes and high-temperature resistant cloth.

8. The sintering machine gas injection side sealing device according to any one of claims 7, characterized in that: The spring pressing mechanism (8) includes a base (18) fixed to the side column (7) by the second bolt (19), a pressing device chamber (21) fixed to the base (18), a spring (20) and a piston body (22) inserted into the pressing device chamber (21). One side of the piston body (22) is fixed with a first connecting rod (23), and the other side abuts against the spring (20). The first connecting rod (23) is fixedly connected to the second connecting rod (24) by the third bolt (25). The other end of the second connecting rod (24) is fixedly connected with a pressing plate (26), and the pressing plate (26) presses against the connection part between the small railing (10) and the large railing (11).

9. The sintering machine gas injection side sealing device according to claim 8, characterized in that: Both ends of the pressing plate (26) are provided with arcs.

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