Sintering flue gas recycling system

Abstract

The utility model relates to the technical field of flue gas, in particular to a sintering flue gas recycling system which comprises a sintering machine trolley, a closed hot air cover is arranged above the sintering machine trolley, a plurality of air boxes are sequentially connected below the sintering machine trolley, and the air boxes are connected with a chimney through smoke exhaust pipelines. The multiple air boxes located at the two ends of the sintering machine trolley form a circulation section, and the multiple air boxes located at the circulation section are connected with the closed hot air cover through circulation smoke pipelines. Reversing devices are arranged on the air boxes; and the air boxes are connected with the smoke exhaust pipeline and the circulating smoke pipeline through the reversing devices. Through the arrangement of the reversing device and the circulating smoke pipeline, waste gas generated by sintering operation of the sintering machine trolley is discharged into the circulating smoke pipeline through the air bellow under the reversing action of the reversing device, and part of sintering smoke returns to the sintering machine trolley again, so that the sintering waste gas is recycled; the reversing device can avoid corrosion of sintering flue gas, and the service life of the reversing device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a sintering flue gas recycling system. Background Art

[0002] A large amount of waste gas is generated during the iron ore sintering production process of steel enterprises. The waste gas contains a variety of complex environmental pollutants, such as dust, sulfides, heavy metals, etc. At present, most of the hot waste gas generated in the sintering production is discharged through the chimney for dust removal. In actual use, the temperature of the waste gas in the sintering production is 100-200℃, and the temperature of the wind box at the end of the sintering production reaches above 200℃. At present, the sintering flue gas recycling system is commonly used to recycle the sintering flue gas.

[0003] For example, the sintering waste gas emission reduction treatment system disclosed in Patent No. CN203810948U, although it can make part of the sintering waste gas re-participate in the sintering process through the circulation system, so that the sintering flue gas can be recycled and the energy-saving effect is obvious, in actual use, the bellows mostly use a three-way pipe to connect the two sintering main dust reduction pipes, and valves will be installed on the two outlet ends of the three-way pipe for control and adjustment to control the sintering flue gas entering the flue gas circulation system. Since the sintering flue gas contains a lot of dust and corrosive gases such as sulfur dioxide, it will corrode the three-way pipe and the valve, thereby reducing the service life of the three-way pipe and the valve, so it needs to be improved. Utility Model Content

[0004] The utility model aims to provide a reversing device for a sintering flue gas circulation wind box to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The sintering flue gas recycling system comprises a sintering machine trolley. A closed hot air hood is arranged above the sintering machine trolley. A plurality of bellows are sequentially connected to the bottom of the sintering machine trolley. The plurality of bellows are connected to the chimney through smoke exhaust ducts. The plurality of bellows located at both ends of the sintering machine trolley form a circulation section. The plurality of bellows located in the circulation section are connected to the closed hot air hood through the circulating smoke duct. A reversing device is arranged on the bellows, and the bellows are connected to the smoke exhaust duct and the circulating smoke duct through the reversing device.

[0007] Preferably, the reversing device comprises a box body, one side of which is connected to the wind box through a smoke inlet pipe, and the other side of the box body is provided with a smoke exhaust pipe for connecting the smoke exhaust pipe and the circulating smoke pipe, and a reversing component for switching the two smoke exhaust pipes is provided in the box body;

[0008] The reversing assembly includes a rotating shaft rotatably arranged in a box body, one end of the rotating shaft is provided with a blocking plate for blocking the smoke exhaust pipe, the other end of the rotating shaft is arranged outside the box body, and an outer wall of the box body is provided with a fixing part for fixing the rotating shaft, and the fixing part is used to enable the blocking plate to block the corresponding smoke exhaust pipe.

[0009] Preferably, the fixing member includes a sleeve which is sleeved on the protruding end of the rotating shaft, and a locking member is relatively provided on the outer wall of the sleeve. The locking member includes a locking cylinder, in which a retractable locking pin is provided, one end of which extends into the sleeve, and a locking hole is provided on the outer wall of the rotating shaft for one end of the locking pin to extend into.

[0010] Preferably, a locking chamber opening outward is provided in the locking cylinder, a blocking ring is provided at the opening of the locking chamber for the other end of the locking pin to extend out, a retaining ring is provided on the side wall of the locking pin located in the locking chamber, and a spring for driving one end of the locking pin to extend into the sleeve is provided on the locking pin located between the blocking ring and the retaining ring.

[0011] Preferably, the inner side walls of the box body are provided with limiting protrusions located on both sides of the rotating shaft and used to limit the blocking plate.

[0012] Preferably, a hand-cranked wheel is provided at the other end of the rotating shaft.

[0013] Preferably, one end of the sleeve extends outward to form a mounting portion, and the mounting portion is fixed to the outer side wall of the box body by screws.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model, through the arrangement of the reversing device and the circulating smoke duct, enables the waste gas generated by the sintering operation of the sintering machine trolley to be discharged into the circulating smoke duct through the reversing action of the reversing device, so that part of the sintering smoke returns to the sintering machine trolley again, thereby recycling the sintering waste gas. At the same time, the reversing device can avoid the corrosion of the sintering smoke and increase its service life.

[0016] 2. The utility model, by lifting up a shorter locking pin and driving the blocking plate to rotate through the rotating shaft, blocks different smoke exhaust pipes, that is, the reversing device controls whether the sintering smoke enters the circulating smoke duct. The operation is simple and convenient, making the use of the reversing device more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the sintering flue gas recycling system in the utility model.

[0018] Figure 2 This is one of the structural schematic diagrams of the reversing device in the utility model.

[0019] Figure 3This is the second structural schematic diagram of the reversing device in the utility model.

[0020] Figure 4 It is a structural schematic diagram of the fixing member in the utility model.

[0021] Figure 5 It is a cross-sectional schematic diagram of the fixing member in the utility model.

[0022] The meaning of the symbols in the figure is:

[0023] 100, sintering machine trolley; 101, closed hot air hood; 102, bellows; 110, chimney; 120, high-efficiency multi-cyclone dust collector; 130, booster fan; 140, dust collector; 150, spindle fan;

[0024] 200, box body; 201, smoke inlet pipe; 202, smoke exhaust pipe; 210, fixing parts;

[0025] 300, rotating shaft; 301, blocking plate; 311, limiting convex column;

[0026] 400, sleeve; 401, mounting portion; 410, locking cylinder; 420, locking pin; 431, hand wheel; 501, locking hole; 511, locking cavity; 520, blocking ring; 531, retaining ring; 540, spring. DETAILED DESCRIPTION

[0027] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to explain the utility model but not to limit it.

[0028] The following is combined with Figure 1-Figure 5 This embodiment is described in further detail.

[0029] like Figure 1 As shown, the sintering flue gas recycling system in this embodiment includes a sintering machine trolley 100, a closed hot air hood 101 is provided above the sintering machine trolley 100, and a plurality of bellows 102 are sequentially connected to the bottom of the sintering machine trolley 100, and the plurality of bellows 102 are connected to the chimney 110 through a smoke exhaust duct. The plurality of bellows 102 located at both ends of the sintering machine trolley 100 form a circulation section, and the plurality of bellows 102 located in the circulation section are connected to the closed hot air hood 101 through a circulating smoke duct; a reversing device is provided on the bellows 102, and the bellows 102 are connected to the smoke exhaust duct and the circulating smoke duct through the reversing device.

[0030] In actual use of this embodiment, the number of wind boxes 102 is 25, which are numbered 0-24 from left to right, wherein the sintering flue gas in the wind boxes 102 No. 0-6 and No. 20-24 is transported to the closed hot air hood 101 again through the circulating flue gas duct, that is, the sintering flue gas discharged from the wind boxes 102 in the circulation section can be returned to the sintering machine trolley 100, so that the sintering flue gas is used again for hot air sintering operation, thereby making part of the sintering flue gas generated by the sintering machine trolley 100 during sintering be recycled;

[0031] The circulating smoke duct is provided with a high-efficiency multi-cyclone dust collector 120 and a booster fan 130 in sequence. The booster fan 130 is used to transport the sintering smoke in the circulating smoke duct, and the high-efficiency multi-cyclone dust collector 120 is used to remove large dust particles in the sintering smoke flowing in the circulating smoke duct, so that the sintering smoke circulating into the sintering machine trolley 100 is dust-free for use in hot air sintering.

[0032] In this embodiment, a dust collector 140 and a spindle fan 150 are sequentially arranged on the smoke exhaust duct. The spindle fan 150 can be used to transport the sintering flue gas in the smoke exhaust duct. During this process, the dust collector 140 can remove large particles of dust in the sintering flue gas flowing in the smoke exhaust duct, so that the sintering flue gas entering the chimney 110 is dust-free. The chimney 110 is an existing structure, which can desulfurize the sintering flue gas entering therein so as to directly discharge the sintering flue gas.

[0033] Among them, through the setting of the reversing device, the bellows 102 is connected to the smoke exhaust duct and the circulating smoke duct through the reversing device, which facilitates the switching of the sintering flue gas discharged by the bellows 102 between the smoke exhaust duct and the circulating smoke duct. Even the sintering flue gas discharged by the bellows 102 can be discharged to the chimney or returned to the sintering machine trolley for circulation, thereby ensuring the normal production of the sintering flue gas recycling system.

[0034] Combination Figure 2 and Figure 3 As shown, in this embodiment, the reversing device includes a box body 200, one side of the box body 200 is connected to the wind box 102 through a smoke inlet pipe 201, and the other side of the box body 200 is oppositely provided with a smoke exhaust pipe 202 for connecting the smoke exhaust pipe and the circulating smoke pipe, and a reversing component for switching the two smoke exhaust pipes 202 on and off is arranged in the box body 200;

[0035] The reversing assembly includes a rotating shaft 300 rotatably arranged in the box body 200, one end of the rotating shaft 300 is provided with a blocking plate 301 for blocking the smoke exhaust pipe 202, the other end of the rotating shaft 300 is arranged to extend outside the box body 200, and an outer wall of the box body 200 is provided with a fixing part 210 for fixing the rotating shaft 300, and the fixing part 210 is used to enable the blocking plate 301 to block the corresponding smoke exhaust pipe 202.

[0036] In this embodiment, one end of the smoke inlet pipe 201 is fixedly connected to the outer wall of the box body 200 so that it is connected to the inside of the box body 200, and the other end extends outward to form a flange portion, and the flange portion is preferably used to facilitate the connection between the reversing device and the wind box 102; wherein, one end of the smoke exhaust pipe 202 is fixedly connected to the outer wall of the box body 200 so that it is connected to the inside of the box body 200, and the other end is used to connect the smoke exhaust pipe and the circulating smoke pipe respectively;

[0037] Through the structure in this embodiment, the blocking plate 301 is driven to rotate around the rotating shaft 300 through the rotation of the rotating shaft 300, so that it blocks the end of the corresponding smoke exhaust pipe 202 connected to the box body 200, that is, the smoke exhaust pipe 202 is blocked. Therefore, the opening and closing switching of the two smoke exhaust pipes 202 can be realized through the rotation of the rotating shaft 300, that is, the sintering smoke discharged from the bellows 102 is controlled to enter the smoke exhaust pipe or the circulating smoke pipe; wherein, the blocking plate 301 is tightly slidably fitted with the inner wall of the box body 200 to ensure the sealing effect of the blocking plate 301 on the smoke exhaust pipe 202, wherein, the inner wall of the box body 200 is provided with a wear-resistant lining plate matched with the blocking plate 301, thereby reducing the wear between the blocking plate 301 and the inner wall of the box body 200;

[0038] The other end of the rotating shaft 300 is extended out of the box body 200, and a hand-cranked wheel 431 is provided at the extended end, so that in actual use, the rotating shaft 300 can be driven to rotate by the hand-cranked wheel 431, which is convenient for the operator to manually control the opening and closing of the smoke exhaust pipe 202;

[0039] The fixing member 210 is provided so that the fixing member 210 can fix the rotation of the rotating shaft 300, thereby keeping the blocking plate 301 fixed to the end of the corresponding exhaust pipe 202 connected to the box body 200, so as to achieve the sealing of the exhaust pipe 202 by the blocking plate 301;

[0040] Among them, the box body 200, the rotating shaft 300, the blocking plate 301, the smoke inlet pipe 201 and the smoke exhaust pipe 202 are all made of corrosion-resistant materials, such as stainless steel, so that the reversing device has strong corrosion resistance to reduce the corrosion of sintering flue gas, thereby increasing the service life of the reversing device.

[0041] Combination Figure 4 and Figure 5 As shown, in this embodiment, the fixing member 210 includes a sleeve 400 which is sleeved on the outer side of the protruding end of the rotating shaft 300, and a locking member is relatively provided on the outer side wall of the sleeve 400. The locking member includes a locking cylinder 410, and a retractable locking pin 420 is provided in the locking cylinder 410 and one end of the locking pin 420 extends into the sleeve 400. A locking hole 501 is provided on the outer side wall of the rotating shaft 300 for one end of the locking pin 420 to extend into.

[0042] In this embodiment, the sleeve 400 is opened at both ends so that the other end of the rotating shaft 300 can extend through it, and one end of the sleeve 400 extends outward to form a mounting portion 401, which is fixed to the outer wall of the box body 200 by screws, thereby preferably realizing the fixed installation of the sleeve 400 on the box body 200; wherein the locking cylinder 410 is relatively fixed to the outer wall of the sleeve 400, and the locking pin 420 can be telescopically arranged in the corresponding locking cylinder 410, and one end of the locking pin 420 can penetrate the locking cylinder 410 and extend into the sleeve The locking hole 501 is arranged inside the sleeve 400, wherein the rotation of the rotating shaft 300 inside the sleeve 400 can make the locking hole 501 correspond to one of the two locking pins 420. When the locking pin 420 extends into the locking hole 501, the fixing of the rotating shaft 300 can be better achieved. By retracting the locking pin 420 into the locking sleeve 410, it can be disengaged from the locking hole 501, that is, the fixing of the rotating shaft 300 is released. At this time, the opening and closing switching of the smoke exhaust pipe 202 can be achieved by rotating the rotating shaft 300.

[0043] In this embodiment, a locking cavity 511 opening outward is provided in the locking cylinder 410, and a blocking ring 520 is provided at the opening of the locking cavity 511 for the other end of the locking pin 420 to extend out, a retaining ring 531 is sleeved on the side wall of the locking pin 420 located in the locking cavity 511, and a spring 540 for driving one end of the locking pin 420 to extend into the sleeve 400 is sleeved on the locking pin 420 located between the blocking ring 520 and the retaining ring 531.

[0044] In this embodiment, the blocking ring 520 is threadedly connected to the opening of the locking cavity 511, so that the spring 540 is installed in the locking cavity 511; wherein, through the setting of the retaining ring 531, one end of the spring 540 can abut against the blocking ring 520, and the other end abuts against the retaining ring 531, thereby driving one end of the locking pin 420 to extend into the sleeve 400, that is, keeping the locking pin 420 extending into the locking hole 501 to lock the rotating shaft 300;

[0045] In this embodiment, the other end of the locking pin 420 extends through the blocking ring 520, so that in actual use, the user can lift the extended end of the locking pin 420 to disengage it from the locking hole 501 and release the locking of the rotating shaft 300;

[0046] Among them, only one locking hole 501 is provided. When it cooperates with one of the two locking pins 420, the other locking pin 420 abuts against the outer wall of the rotating shaft 300 under the action of the spring 540. As a result, the two locking pins 420 extend out of the locking cylinder 410 to different lengths. Therefore, when releasing the fixation of the rotating shaft 300, it is sufficient to lift up the locking pin 420 with a shorter extension length, thereby facilitating the actual use of the fixing part 210.

[0047] In this embodiment, limiting protrusions 311 are disposed on the inner side walls of the box body 200 and are located on both sides of the rotating shaft 300 and are used to limit the blocking plate 301 .

[0048] In this embodiment, the limiting boss 311 is provided to limit the rotation of the blocking plate 301, thereby preventing the rotating shaft 300 from rotating too much, causing the locking pin 420 to be unable to extend into the locking hole 501, thereby affecting the use effect of the fixing member 210;

[0049] Among them, by setting the position of the limiting boss 311, when it limits the blocking plate 301, the locking hole 501 can better correspond to the locking pin 420, that is, when the rotating shaft 300 is rotated to the point where it cannot rotate, the corresponding locking pin 420 can automatically extend into the locking hole 501 to fix the rotating shaft 300, thereby facilitating the use of the fixing member 210.

[0050] Working principle: by lifting up the shorter locking pin 420 to disengage it from the locking hole 501, the rotation of the rotating shaft 300 has been released. At this time, the rotating shaft 300 drives the blocking plate 301 to rotate, so that the blocking plate 301 blocks the other smoke exhaust pipe 202, thereby realizing the opening and closing switching of the smoke exhaust pipe 202. Therefore, it can better achieve that the sintering flue gas discharged from the corresponding bellows 102 can re-enter the sintering machine trolley 100 through the circulating smoke duct, so that the sintering flue gas can be used again for hot air sintering operations, thereby allowing part of the sintering flue gas generated by the sintering machine trolley 100 during sintering to be recycled.

[0051] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. Sintering flue gas recycling system, characterized by: The invention comprises a sintering machine trolley (100), wherein a sealed hot air hood (101) is provided above the sintering machine trolley (100), and a plurality of wind boxes (102) are sequentially connected to the bottom of the sintering machine trolley (100), and the plurality of wind boxes (102) are connected to a chimney (110) via a smoke exhaust pipe. The plurality of wind boxes (102) located at both ends of the sintering machine trolley (100) form a circulation section, and the plurality of wind boxes (102) located in the circulation section are connected to the sealed hot air hood (101) via a circulating smoke pipe. A reversing device is provided on each wind box (102), and the wind box (102) is connected to the smoke exhaust pipe and the circulating smoke pipe via the reversing device. The reversing device comprises a box body (200), one side of the box body (200) is connected to the wind box (102) via a smoke inlet pipe (201), the other side of the box body (200) is provided with a smoke exhaust pipe (202) for connecting the smoke exhaust pipe and the circulating smoke pipe, and a reversing component for switching the two smoke exhaust pipes (202) on and off is provided in the box body (200); The reversing assembly comprises a rotating shaft (300) rotatably arranged in a box body (200); a blocking plate (301) for blocking a smoke exhaust pipe (202) is provided at one end of the rotating shaft (300); the other end of the rotating shaft (300) is arranged to extend outside the box body (200); a fixing member (210) for fixing the rotating shaft (300) is provided on an outer wall of the box body (200); the fixing member (210) is used to enable the blocking plate (301) to block the corresponding smoke exhaust pipe (202).

2. The sintering flue gas recycling system according to claim 1, characterized in that: The fixing member (210) comprises a sleeve (400) sleeved on the outside of the protruding end of the rotating shaft (300), a locking member is arranged on the outer side wall of the sleeve (400), and the locking member comprises a locking cylinder (410), a retractable locking pin (420) is arranged in the locking cylinder (410) and one end of the locking pin extends into the sleeve (400), and a locking hole (501) is arranged on the outer side wall of the rotating shaft (300) for one end of the locking pin (420) to extend into.

3. The sintering flue gas recycling system according to claim 2, characterized in that: A locking chamber (511) opening outward is provided in the locking cylinder (410); a blocking ring (520) for the other end of the locking pin (420) to extend outward is provided at the opening of the locking chamber (511); a retaining ring (531) is sleeved on the side wall of the locking pin (420) located in the locking chamber (511); and a spring (540) for driving one end of the locking pin (420) to extend into the sleeve (400) is sleeved on the locking pin (420) located between the blocking ring (520) and the retaining ring (531).

4. The sintering flue gas recycling system according to claim 1, characterized in that: The inner side walls of the box body (200) are provided with limiting convex columns (311) located on both sides of the rotating shaft (300) and used to limit the blocking plate (301).

5. The sintering flue gas recycling system according to claim 1, characterized in that: A hand-cranked wheel (431) is provided at the other end of the rotating shaft (300).

6. The sintering flue gas recycling system according to claim 2, characterized in that: One end of the sleeve (400) extends outward to form a mounting portion (401), and the mounting portion (401) is fixed to the outer side wall of the box body (200) by means of screws.

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