Blast furnace slag flue gas treatment device

Abstract

The invention relates to the technical field of blast furnace slag flue gas treatment, and discloses a blast furnace slag flue gas treatment device which comprises a flue gas treatment tank body, a tank cover is fixedly connected to the upper end of the flue gas treatment tank body, and a spraying mechanism is jointly arranged on the right side and in the flue gas treatment tank body. A support ring is fixedly connected to the inner surface of the flue gas treatment tank body, and a plurality of filter plates are mounted above the support ring in the flue gas treatment tank body; a heat exchange box is mounted on the left side of the flue gas treatment tank body, a plurality of heat exchange pipes are mounted in the heat exchange box from front to back, and an ash removal mechanism is arranged on the upper surface of the heat exchange box; slag flue gas enters the heat exchange box before entering the flue gas treatment tank body, heat exchange media in the heat exchange pipes are heated, heat in the slag flue gas is recycled, a motor in the ash removal mechanism drives a storage rod to rotate, an ash removal piece is driven to ascend and descend through a storage rope, and the ash removal effect is improved. And the surface of the heat exchange tube is cleaned by a scraping pad in the dust removal piece.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace slag fume treatment, in particular to a blast furnace slag fume treatment device. Background Art

[0002] During the blast furnace smelting process, high-temperature liquid slag (usually at 1350-1500°C) is one of the main solid wastes produced. In order to effectively utilize these slags, water-washing slag process is usually used to granulate them and use them as cement raw materials. However, this process will produce a large amount of flue gas, which contains fine particles, dust and other pollutants. If it is directly discharged into the atmosphere, it will cause serious pollution to the environment.

[0003] A flue gas treatment device is disclosed in the existing Chinese patent database, and its patent application number is: CN202021990011.6, the application date is: 2020.09.11, the publication number is CN213132530U, and the publication date is: 2020.05.07. The utility model application discloses a flue gas treatment device, including a preprocessor and a flue gas processor. The top of the preprocessor is fixedly connected to an air intake pipe, and the lower end is fixedly connected to an air supply pipe. After the other end of the air supply pipe passes through the flue gas treatment tower, the end thereof is arranged at the bottom of the water tank at the lower end of the flue gas treatment tower. The utility model can only filter the flue gas, but cannot effectively filter the fine particles in the flue gas, resulting in substandard emissions.

[0004] A Chinese patent discloses a blast furnace slag flue gas treatment device (authorization announcement number CN216778349U). The three filter units inside the patented technology will filter the flue gas in turn, so that the fine particles in the flue gas are adsorbed by the filter units;

[0005] The flue gas passes through the primary filter, secondary filter and tertiary filter from bottom to top and then enters the connecting air duct. While the primary filter, secondary filter and tertiary filter are filtering the flue gas in turn, the spray components around the inner wall will spray at all times. At this time, the sprayed water source further filters the flue gas;

[0006] The device has a simple structure and can filter the fine particles in the flue gas in time, thus improving the cleanliness of the filtered flue gas, thereby meeting the emission standards. At the same time, it is more convenient to repair the device body or clean the inside later.

[0007] However, it has certain disadvantages: the temperature of slag flue gas is usually high. If the sensible heat it carries is not recovered, it is equivalent to losing a large amount of low-grade thermal energy in vain. In addition, the high-temperature flue gas directly impacts the spray layer, causing a sharp increase in the evaporation of the absorption liquid (such as water, alkali solution), requiring frequent water or agent replenishment, which increases the treatment cost. Summary of the invention

[0008] The object of the present invention is to provide a blast furnace slag flue gas treatment device to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A blast furnace slag flue gas treatment device includes a flue gas treatment tank body. The upper end of the flue gas treatment tank body is fixedly connected with a tank cover, and the lower end of the flue gas treatment tank body is fixedly connected with a valve communicating with the inside of the flue gas treatment tank body. The upper surface of the tank cover is fixedly connected with an exhaust pipe communicating with the inside of the tank cover. A spraying mechanism is jointly arranged on the right side and inside of the flue gas treatment tank body. A support ring is fixedly connected to the inner surface of the flue gas treatment tank body, and a plurality of filter plates are installed above the support ring inside the flue gas treatment tank body. The outer edges of the plurality of filter plates are jointly movably penetrated and connected with a plurality of support rods. The lower end of the support rod is fixedly connected with a support block;

[0011] A heat exchange box is installed on the left side of the flue gas treatment tank body. The lower end of the left surface of the heat exchange box is fixedly connected with a flue gas inlet pipe communicating with the inside of the heat exchange box, and the upper end of the right surface of the heat exchange box is fixedly connected with a flue gas outlet pipe communicating with the inside of the heat exchange box. A plurality of heat exchange tubes are installed in the heat exchange box from front to back, and an ash removal mechanism is arranged on the upper surface of the heat exchange box.

[0012] As a further scheme of the present invention: The spraying mechanism includes a water pump. The water inlet end of the water pump is fixedly connected with a water pipe one, and the water outlet end of the water pump is fixedly connected with a water pipe two. A spraying part is arranged at the upper end of the water pipe two.

[0013] As a further scheme of the present invention: The spraying part includes a plurality of spray rings distributed from outside to inside. A plurality of through water pipes communicating with their interiors are fixedly connected between adjacent two spray rings. Spray holes are opened on the lower surface of the spray ring.

[0014] As a further scheme of the present invention: The ash removal mechanism includes an L-shaped plate. A motor is fixedly connected to the rear surface of the L-shaped plate. The output end of the motor is fixedly connected with a storage rod. A plurality of storage ropes are wound around the outside of the storage rod from front to back. A sealing block is movably connected to the outside of the storage rope, and an ash removal part is arranged at the lower end of the storage rope.

[0015] As a further scheme of the present invention: The ash removal part includes a plurality of connecting sleeves distributed from left to right. A connecting block is fixedly connected between adjacent two connecting sleeves. A connecting bolt is threadedly penetrated through the front surface of the connecting sleeve, and a scraping sleeve is movably connected to the inside of the connecting sleeve. A scraping pad is fixedly connected to the inside of the scraping sleeve.

[0016] As a further solution of the present invention: The support block is fixedly connected to the inner surface of the flue gas treatment tank body. The flue gas outlet pipe is fixedly connected to the left surface of the flue gas treatment tank body and communicates with the inside of the flue gas treatment tank body. The connection part of the flue gas outlet pipe and the flue gas treatment tank body is located below the support ring. The end of the heat exchange pipe penetrates and is fixedly connected to the upper surface of the heat exchange box.

[0017] As a further solution of the present invention: The second water pipe penetrates and is fixedly connected to the right surface of the flue gas treatment tank body, and the spraying member is placed on the upper surface of the support ring.

[0018] As a further solution of the present invention: The upper end of the second water pipe is fixedly connected to the outer surface of the outermost spray ring and communicates with the inside of the outermost spray ring.

[0019] As a further solution of the present invention: The lower end of the L-shaped plate is fixedly connected to the upper surface of the heat exchange box. The number of the storage ropes is equal to the number of the heat exchange pipes. The sealing block penetrates and is fixedly connected to the upper surface of the heat exchange box.

[0020] As a further solution of the present invention: The lower end of the storage rope is fixedly connected to the upper surface of the connection block. The rear end of the connection bolt is attached to the scraping sleeve, and the scraping pad is movably attached to the outer surface of the heat exchange pipe.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. In the present invention, the water pump in the spraying mechanism extracts the absorption liquid from the outside. First, the absorption liquid is used to absorb and treat the slag flue gas. After absorption, the slag flue gas floats upward and is filtered when passing through the filter plate. By combining absorption and filtration, the treatment effect of the slag flue gas is improved.

[0023] 2. Before the slag flue gas enters the flue gas treatment tank body, it first enters the heat exchange box to heat the heat exchange medium inside the heat exchange pipes in the heat exchange box, realizing the recovery of the heat in the slag flue gas and avoiding the waste of heat.

[0024] 3. In the present invention, by providing an ash removal mechanism, the motor in the ash removal mechanism drives the storage rod to rotate, and the ash removal part is driven to lift through the storage rope, so that the scraping pad in the ash removal part cleans the surface of the heat exchange pipe, removing the accumulated dust and preventing it from forming a heat insulation layer and affecting the heat exchange efficiency of the heat exchange pipe. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a blast furnace slag flue gas treatment device;

[0026] Figure 2 It is a schematic structural diagram of the spraying mechanism in a blast furnace slag flue gas treatment device;

[0027] Figure 3 It is a schematic structural diagram of a spraying component in a blast furnace slag flue gas treatment device;

[0028] Figure 4 It is a bottom view of a spray hole in a blast furnace slag flue gas treatment device;

[0029] Figure 5 It is a partial cross-sectional view of the body of a flue gas treatment tank in a blast furnace slag flue gas treatment device;

[0030] Figure 6 It is a partial schematic diagram of a blast furnace slag flue gas treatment device;

[0031] Figure 7 It is a schematic structural diagram of an ash removal mechanism in a blast furnace slag flue gas treatment device;

[0032] Figure 8 It is a schematic structural diagram of an ash removal component in a blast furnace slag flue gas treatment device.

[0033] In the figure: 1, the body of the flue gas treatment tank; 2, the tank cover; 3, the valve; 4, the exhaust pipe; 5, the spraying mechanism; 6, the water pump; 7, the first water pipe; 8, the second water pipe; 9, the spraying component; 10, the spray ring; 11, the water through pipe; 12, the spray hole; 13, the support ring; 14, the filter plate; 15, the support rod; 16, the support block; 17, the heat exchange box; 18, the flue gas inlet pipe; 19, the flue gas outlet pipe; 20, the heat exchange pipe; 21, the ash removal mechanism; 22, the L-shaped plate; 23, the motor; 24, the storage rod; 25, the storage rope; 26, the sealing block; 27, the ash removal component; 28, the connecting sleeve; 29, the connecting block; 30, the connecting bolt; 31, the scraping sleeve; 32, the scraping pad. Specific embodiments

[0034] Please refer to Figures 1 to 5 , in an embodiment of the present invention, a blast furnace slag flue gas treatment device includes a body 1 of the flue gas treatment tank. A tank cover 2 is fixedly connected to the upper end of the body 1 of the flue gas treatment tank, and a valve 3 communicating with the inside of the body 1 of the flue gas treatment tank is fixedly connected to the lower end of the body 1 of the flue gas treatment tank. A smoke exhaust pipe 4 communicating with the inside of the tank cover 2 is fixedly connected to the upper surface of the tank cover 2;

[0035] On the right side and inside the body 1 of the flue gas treatment tank, a spraying mechanism 5 is jointly arranged. The spraying mechanism 5 includes a water pump 6. The water inlet end of the water pump 6 is fixedly connected with a first water pipe 7, and the water outlet end of the water pump 6 is fixedly connected with a second water pipe 8. The second water pipe 8 penetrates and is fixedly connected to the right surface of the body 1 of the flue gas treatment tank. At the upper end of the second water pipe 8, a spraying part 9 is arranged. The spraying part 9 is placed on the upper surface of the support ring 13. The spraying part 9 includes a plurality of spraying rings 10 distributed from outside to inside. The upper end of the second water pipe 8 is fixedly connected to the outer surface of the outermost spraying ring 10, and the second water pipe 8 communicates with the inside of the outermost spraying ring 10. A plurality of communicating pipes 11 communicating with their interiors are fixedly connected between two adjacent spraying rings 10. Spray holes 12 are formed on the lower surface of the spraying ring 10. The inner surface of the body 1 of the flue gas treatment tank is fixedly connected with a support ring 13, and a plurality of filter plates 14 are installed above the support ring 13 inside the body 1 of the flue gas treatment tank. A plurality of support rods 15 are movably and penetratingly connected to the outer edges of the plurality of filter plates 14. The lower end of the support rod 15 is fixedly connected with a support block 16, and the support block 16 is fixedly connected to the inner surface of the body 1 of the flue gas treatment tank;

[0036] The body 1 of the flue gas treatment tank and the tank cover 2 are detachable;

[0037] The first water pipe 7 is connected to an external absorbent. The absorbent can be clean water, an alkaline absorbent, an oxidation absorbent, a composite additive, etc., and is used for absorbing and treating the slag flue gas;

[0038] The spraying rings 10 distributed from outside to inside are all hollow cylinders, and the radii decrease in turn. The absorbent finally entering the spraying rings 10 is finally sprayed out through the spray holes 12;

[0039] The filter plates 14 are used for filtering the slag flue gas and filtering out the particulate impurities therein. They can be ceramic filter plates, PTFE-coated filter plates;

[0040] Moving the filter plate 14 upward to disengage it from the outside of the support rod 15 allows it to be disassembled and replaced;

[0041] In Figure 1 and Figure 6 : On the left side of the body 1 of the flue gas treatment tank, a heat exchange box 17 is installed. At the lower end of the left surface of the heat exchange box 17, a flue gas inlet pipe 18 communicating with the inside of the heat exchange box 17 is fixedly connected. At the upper end of the right surface of the heat exchange box 17, a flue gas outlet pipe 19 communicating with the inside of the heat exchange box 17 is fixedly connected. The flue gas outlet pipe 19 is fixedly connected to the left surface of the body 1 of the flue gas treatment tank, and the flue gas outlet pipe 19 communicates with the inside of the body 1 of the flue gas treatment tank. The connection part between the flue gas outlet pipe 19 and the body 1 of the flue gas treatment tank is located below the support ring 13. A plurality of heat exchange pipes 20 are installed in the heat exchange box 17 from front to back. The ends of the heat exchange pipes 20 penetrate and are fixedly connected to the upper surface of the heat exchange box 17;

[0042] The heat exchange box 17 includes a box body and a box cover, and the heat exchange tubes 20 penetrate and are fixedly connected to the box cover;

[0043] The flue gas inlet pipe 18 is used for discharging flue gas, and the flue gas outlet pipe 19 is used for discharging flue gas;

[0044] The left and right ends of the heat exchange tubes 20 are respectively used for discharging and discharging the heat exchange medium, and the heat exchange medium is used to absorb the heat in the slag flue gas; the heat exchange medium can be water, air, etc.;

[0045] The heat exchange tubes 20 are S-shaped coiled tubes, which can increase the contact time between the heat exchange medium and the slag flue gas, thereby improving the heat exchange efficiency; the heat exchange tubes 20 have high thermal conductivity.

[0046] In Figure 1 , Figures 6 to 8 : An ash removal mechanism 21 is provided on the upper surface of the heat exchange box 17. The ash removal mechanism 21 includes an L-shaped plate 22. The lower end of the L-shaped plate 22 is fixedly connected to the upper surface of the heat exchange box 17. A motor 23 is fixedly connected to the rear surface of the L-shaped plate 22. The output end of the motor 23 is fixedly connected to a storage rod 24. A plurality of storage ropes 25 are wound around the outside of the storage rod 24 from front to back. The number of the storage ropes 25 is equal to the number of the heat exchange tubes 20. A sealing block 26 is movably connected to the outside of the storage rope 25. The sealing block 26 penetrates and is fixedly connected to the upper surface of the heat exchange box 17. An ash removal member 27 is provided at the lower end of the storage rope 25. The ash removal member 27 includes a plurality of connecting sleeves 28 distributed from left to right. A connecting block 29 is fixedly connected between two adjacent connecting sleeves 28. The lower end of the storage rope 25 is fixedly connected to the upper surface of the connecting block 29. A connecting bolt 30 is threadedly connected through the front surface of the connecting sleeve 28, and a scraping sleeve 31 is movably connected to the inside of the connecting sleeve 28. The rear end of the connecting bolt 30 abuts against the scraping sleeve 31. A scraping pad 32 is fixedly connected to the inside of the scraping sleeve 31. The scraping pad 32 is movably attached to the outer surface of the heat exchange tube 20;

[0047] The motor 23 is connected to a forward and reverse circuit and is equipped with a brake, that is, after power-off, the motor shaft cannot rotate;

[0048] The storage rod 24 can rotate clockwise or counterclockwise to respectively store or release the storage ropes 25, thereby driving the ash removal member 27 to lift and lower outside the heat exchange tubes 20;

[0049] The ash removal member 27 is heavy enough to descend normally outside the heat exchange tubes 20;

[0050] The material of the scraping pad 32 is preferably sponge, which is used to clean the outer surface of the heat exchange tubes 20 and remove the dust accumulated on its surface, so as to avoid the formation of a heat insulation layer due to excessive dust accumulation, resulting in the influence of the heat exchange efficiency;

[0051] The material of the sealing block 26 is preferably rubber, which has a certain extrusion pressure on the storage rope 25. When the dust removal mechanism 21 is not running, it seals the connection between the storage rope 25 and the heat exchange box 17.

[0052] The working principle of the present invention is as follows: When in use, the slag flue gas generated by the treatment of blast furnace slag is discharged into the interior of the heat exchange box 17 through the flue gas inlet pipe 18. After heating the medium in the heat exchange tube 20, the slag flue gas is discharged into the interior of the flue gas treatment tank body 1 through the flue gas outlet pipe 19; the water pump 6 pumps water from the outside through the first water pipe 7, and pumps the absorbent liquid into the spraying member 9 through the second water pipe 8, and finally sprays it out through the spray holes 12 to absorb and treat the slag flue gas; the slag flue gas treated by the absorbent liquid floats upward, and is adsorbed and filtered when passing through the filter plate 14. Finally, the slag flue gas that has undergone heat exchange, absorption and filtration is discharged through the exhaust pipe 4; when the flue gas treatment is not carried out, the motor 23 drives the storage rod 24 to rotate, first releases the storage rope 25, thereby driving the ash removal member 27 to descend, and then winds up the storage rope 25, thereby driving the ash removal member 27 to descend, so that the scraping pad 32 in the ash removal member 27 cleans the surface of the heat exchange tube 20 and removes the adhered dust to prevent excessive accumulation and affect the heat exchange performance.

[0053] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0054] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A blast furnace slag flue gas treatment device, comprising a flue gas treatment tank body (1), the upper end of the flue gas treatment tank body (1) is fixedly connected to a tank cover (2), and the lower end of the flue gas treatment tank body (1) is fixedly connected to a valve (3) connected to the interior of the flue gas treatment tank body (1), the upper surface of the tank cover (2) is fixedly connected to a smoke exhaust pipe (4) connected to the interior of the tank cover (2), a spray mechanism (5) is commonly provided on the right side and the interior of the flue gas treatment tank body (1), a support ring (13) is fixedly connected to the inner surface of the flue gas treatment tank body (1), and a plurality of filter plates (14) are installed inside the flue gas treatment tank body (1) above the support ring (13), and a plurality of support rods (15) are commonly movably penetrated and connected at the outer edges of the plurality of filter plates (14), and a support block (16) is fixedly connected to the lower end of the support rod (15); It is characterized in that A heat exchange box (17) is installed on the left side of the flue gas treatment tank body (1), a flue gas inlet pipe (18) connected to the interior of the heat exchange box (17) is fixedly connected to the lower end of the left side surface of the heat exchange box (17), and a flue gas outlet pipe (19) connected to the interior of the heat exchange box (17) is fixedly connected to the upper end of the right side surface of the heat exchange box (17), a plurality of heat exchange tubes (20) are installed inside the heat exchange box (17) from front to back, and an ash removal mechanism (21) is provided on the upper surface of the heat exchange box (17).

2. A blast furnace slag flue gas treatment device according to claim 1, characterized in that: The spray mechanism (5) comprises a water pump (6), the water inlet end of the water pump (6) is fixedly connected to a water pipe 1 (7), and the water outlet end of the water pump (6) is fixedly connected to a water pipe 2 (8), and a spray component (9) is provided at the upper end of the water pipe 2 (8).

3. A blast furnace slag flue gas treatment device according to claim 2, characterized in that: The spraying element (9) comprises a plurality of spray rings (10) distributed from the outside to the inside, a plurality of water pipes (11) connected to the inside of two adjacent spray rings (10) are fixedly connected, and a spray hole (12) is provided on the lower surface of the spray ring (10).

4. A blast furnace slag flue gas treatment device according to claim 1, characterized in that: The dust removal mechanism (21) comprises an L-shaped plate (22), a motor (23) is fixedly connected to the rear surface of the L-shaped plate (22), a storage rod (24) is fixedly connected to the output end of the motor (23), a plurality of storage ropes (25) are wound around the outside of the storage rod (24) from front to back, a sealing block (26) is movably connected to the outside of the storage rope (25), and a dust removal component (27) is provided at the lower end of the storage rope (25).

5. A blast furnace slag flue gas treatment device according to claim 4, characterized in that: The dust removal component (27) comprises a plurality of connecting sleeves (28) distributed from left to right, a connecting block (29) being fixedly connected between two adjacent connecting sleeves (28), a connecting bolt (30) being threadedly connected through the front surface of the connecting sleeve (28), and a scraping sleeve (31) being movably connected inside the connecting sleeve (28), and a scraping pad (32) being fixedly connected inside the scraping sleeve (31).

6. A blast furnace slag flue gas treatment device according to claim 1, characterized in that: The support block (16) is fixedly connected to the inner surface of the flue gas treatment tank body (1), the flue gas outlet pipe (19) is fixedly connected to the left side surface of the flue gas treatment tank body (1), and the flue gas outlet pipe (19) is connected to the inside of the flue gas treatment tank body (1), the connection between the flue gas outlet pipe (19) and the flue gas treatment tank body (1) is located below the support ring (13), and the end of the heat exchange pipe (20) passes through and is fixedly connected to the upper surface of the heat exchange box (17).

7. A blast furnace slag fume treatment device according to claim 2, characterized in that: The second water pipe (8) penetrates and is fixedly connected to the right side surface of the flue gas treatment tank body (1), and the spraying member (9) is placed on the upper surface of the support ring (13).

8. The blast furnace slag fume treatment device according to claim 3, characterized in that: The upper end of the second water pipe (8) is fixedly connected to the outer surface of the outermost spray ring (10), and the second water pipe (8) is connected to the interior of the outermost spray ring (10).

9. A blast furnace slag fume treatment device according to claim 4, characterized in that: The lower end of the L-shaped plate (22) is fixedly connected to the upper surface of the heat exchange box (17), the number of the storage ropes (25) is equal to the number of the heat exchange tubes (20), and the sealing block (26) passes through and is fixedly connected to the upper surface of the heat exchange box (17).

10. The blast furnace slag fume treatment device according to claim 5, characterized in that: The lower end of the storage rope (25) is fixed to the upper surface of the connection block (29), the rear end of the connection bolt (30) is in contact with the scraper sleeve (31), and the scraper pad (32) is movably in contact with the outer surface of the heat exchange tube (20).

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