JP7741379B2 - dust remover - Google Patents

Description

The present invention relates to a dust remover.

The fluid generated from the equipment may contain dust, and the dust is separated from the fluid through a dust collector. In this case, the dust is discharged from an outlet provided in the dust collector.
For example, blast furnace gas generated in a blast furnace is passed through a dust collector (dust collection device) and reused as clean gas. The dust collected by the dust collector is periodically discharged from an outlet located at the bottom of the dust collector.
However, the outlet can become blocked for a variety of reasons, including:
(1) For example, when the refractory material installed on the inner surface of the duct of a dust collector falls off due to deterioration over time or poor installation.
(2) For example, when the refractory falls off due to a blast furnace trouble such as a blow-through.
(3) For example, if a large mass (a mass caused by the adhesion of dust, fumes, etc.) present inside the duct falls.
Therefore, in order to catch the falling large blocks (including refractories) and prevent them from blocking the discharge outlet, a structure has conventionally been provided above the discharge outlet.
For example, in Patent Document 1 below, a tube with a sieve-like side is placed at the discharge port to prevent a large lump from directly blocking the discharge port when it falls. In this invention, the side of the tube is made into a sieve surface so that dust can pass through not only the top of the tube but also the side. This allows dust to be discharged normally.

JP 2017-87132 A

However, with the above-mentioned conventional dust collectors, the tube is required to be placed at the discharge outlet, and it is not possible to install the tube at any other position on the dust collector. Furthermore, because the tube is located near the discharge outlet, if, for example, the meshes on the sieve surface become clogged with dust, the dust will only be discharged from the upper part of the tube. As a result, the number of times dust needs to be discharged increases, and in the worst case scenario, operations may have to be halted.

The present invention was made in consideration of the above-mentioned circumstances, and aims to smoothly discharge dust while preventing the discharge outlet from being blocked by clumps falling into the dust collector.

<1> One aspect of the present invention relates to a dust remover that collects dust contained in a fluid, and includes an inlet section that introduces fluid into the dust remover, a fluid outlet section that discharges the fluid introduced from the inlet section from which dust has been separated, a dust outlet that is provided at the bottom of the dust remover and discharges the dust collected in the dust remover, and a sieve that is located below the inlet section and above the dust outlet and has a plurality of openings, the sieve being positioned across the entire bottom of the dust remover, and the minimum cross-sectional length of at least one of the plurality of openings being smaller than the maximum cross-sectional length of the dust outlet.

The sieve is disposed below the introduction section and above the dust outlet. The sieve is then disposed across the entire lower surface of the dust collector. Therefore, objects falling from the introduction section must pass through the sieve to reach the dust outlet. Here, the minimum cross-sectional length of at least one of the multiple openings is smaller than the maximum cross-sectional length of the dust outlet. Therefore, clumps large enough to block the dust outlet are likely to get caught in the sieve. If a clump gets caught in the sieve, it will not pass through the sieve. Therefore, clumps are prevented from blocking the dust outlet.
In this dust collector, to prevent clumps from clogging the dust outlet, the sieve is positioned below the introduction section and above the dust outlet. In other words, unlike the conventional dust collector, there is no need to erect a tube at the outlet. Therefore, for example, the sieve can be installed at a position sufficiently far from the outlet. Therefore, even if the sieve becomes clogged, the flow near the outlet is unlikely to be obstructed. This allows for smooth dust discharge.

<2> In the dust collector according to <1> above, the sieve may be configured to be inclined relative to the horizontal direction.

The sieve is inclined relative to the horizontal. This makes it easier for clumps caught on the sieve to gather in specific areas along the inclination of the sieve. This makes it easier to remove clumps, for example.

<3> The dust collector according to <1> or <2> above may be configured so that a manhole is provided on the side of the dust collector and positioned above the sieve.

The manhole is located above the sieve, allowing workers to remove lumps on the sieve through the manhole. If the sieve is tilted relative to the horizontal, tilting the sieve toward the manhole will make it easier for lumps to collect in the manhole.

<4> In the dust remover according to any one of <1> to <3> above, the sieve may include a plurality of rod-shaped members, and at least some of the plurality of openings may be formed between the plurality of rod-shaped members that are adjacent in the horizontal direction.

The sieve comprises multiple rod-shaped members. Furthermore, at least some of the openings are formed between horizontally adjacent rod-shaped members. This allows for a high degree of freedom in setting the cross-sectional length and area of the openings, for example.

<5> In the dust remover according to <4> above, at least some of the rod-shaped members may be pipes.

At least some of the rod-shaped members are pipes. This makes the sieve lightweight. The sieve is also made from common materials. As a result, the sieve can be manufactured inexpensively.

<6> The dust collector according to <5> above may be configured to further include a steam supply unit that supplies steam into the pipe.

In dry or electric dust collectors used for blast furnace top gas, if the dust that comes into contact with the sieve is wet, the dust adheres to the sieve and accumulates. If the dust adhered to the sieve grows large, it may clog the sieve openings. Furthermore, high-temperature top gas is introduced into the dust collector (the temperature of the top gas is approximately 100-200°C during normal operation and approximately 600-1200°C during blow-through). Therefore, if dust adheres to the sieve, the heat from the top gas causes the dust to harden, as if sintered. As a result, the dust becomes more difficult to remove from the sieve, making the openings more susceptible to clogging.
If the openings in the sieve become blocked, it may be necessary, for example, to stop operation of a blast furnace and clean the dust that has adhered to the sieve.
Here, the steam supply unit supplies steam (for example, at about 100°C to 300°C) into the pipe. This promotes drying of the dust adhering to the sieve. This prevents the dust from growing on the surface of the sieve. As a result, the openings of the sieve are less likely to be clogged with dust.

<7> In the dust remover according to any one of <4> to <6> above, at least some of the rod-shaped members may be configured to penetrate the dust remover horizontally.

At least some of the rod-shaped members penetrate horizontally through the dust collector. Therefore, for example, if a rod-shaped member becomes worn or damaged, an operator can remove or install the rod-shaped member from outside the dust collector, making replacement work easy.

<8> In the dust remover according to any one of <1> to <7> above, when the dust remover is viewed from above and below, each of the multiple openings may be smaller than the dust discharge outlet.

When the dust collector is viewed from above and below, each of the multiple openings is smaller than the dust discharge outlet. This makes it easier for clumps to get caught in the sieve.

This invention allows for smooth discharge of dust while preventing clumps from falling into the dust collector and blocking the discharge outlet.

1 is a vertical cross-sectional view of a dust remover according to an embodiment of the present invention. FIG. 2 is a perspective view of a sieve constituting the dust remover shown in FIG. 1 . FIG. 3 is a top view showing a main part of the sieve shown in FIG. 2 . FIG. 10 is a vertical cross-sectional view of a dust remover according to a comparative example of the present invention, showing a state in which a dust discharge valve is closed. FIG. 5 is a vertical cross-sectional view of the dust remover shown in FIG. 4, showing a state in which the dust discharge valve is open. FIG. 5 is a vertical cross-sectional view of the dust remover shown in FIG. 4, showing a state in which a lump is blocking the discharge port. 2 is a vertical cross-sectional view of the dust remover shown in FIG. 1, showing a state in which the lump is supported on the sieve and the dust discharge valve is closed; FIG. 2 is a vertical cross-sectional view of the dust remover shown in FIG. 1, showing a state in which the lump is supported on the sieve and the dust discharge valve is open; FIG. FIG. 10 is a vertical cross-sectional view of a dust remover according to a first modified example of the present invention. FIG. 10 is a vertical cross-sectional view of a dust remover according to a second modified example of the present invention. FIG. 10 is a vertical cross-sectional view of a dust remover according to a third modified example of the present invention. FIG. 12 is a cross-sectional view of the dust remover shown in FIG. 11 . FIG. 10 is a cross-sectional view of a dust remover according to a fourth modified example of the present invention. FIG. 10 is a vertical cross-sectional view of a dust remover according to a fifth modified example of the present invention. FIG. 10 is a vertical cross-sectional view of a dust remover according to a sixth modified example of the present invention.

A dust remover 10 according to one embodiment of the present invention will be described below with reference to Figures 1 to 8. The dust remover 10 is used, for example, for the top gas of a blast furnace.
A blast furnace is a furnace that produces molten iron by reducing iron ore using coke. In the blast furnace, iron ore is heated and reduced to produce molten iron, which is then tapped from a taphole at the bottom of the blast furnace. Blast furnace gas generated by the combustion of coke and the reduction of iron ore is discharged from the top of the blast furnace as top gas 1 (fluid). The main components of top gas 1 are N ₂ , CO ₂ , CO, and H ₂ . Top gas 1 also contains a large amount of dust 2, which consists of fine particles of the raw materials charged into the blast furnace.

The furnace top gas 1 is introduced into the dust collector 10 through a furnace top gas introduction pipe 11 (introduction section, downcomer, downcomer). The inside of the furnace top gas introduction pipe 11 is lined with a refractory 12 (castable, refractory material).
The furnace gas 1 introduced into the dust collector 10 is separated into the furnace gas 1 and dust 2 in the dust collector 10. The dust collector 10 may be of various types, such as a dry type, a wet type, or an electric type.

The dust collector 10 has a hopper 13 (dust collector body) to which blast furnace top gas 1 is supplied from a furnace top gas inlet pipe 11. The hopper 13 has a central section 14 which is a hollow cylinder, an upper section 15 which is a hollow cone that narrows toward the top, and a lower section 16 which is a hollow cone that narrows toward the bottom.

In this embodiment, the lower end of the furnace top gas introduction pipe 11 forms an inner tube 17 (diffuser). The inner tube 17 is located within the hopper 13. The diameter of the inner tube 17 increases downward. No refractory material 12 is provided on the inner surface of the inner tube 17. The lower end of the inner tube 17 is located in the center portion 14.

The hopper 13 is provided with an exhaust pipe 21 (fluid discharge section) for discharging the furnace gas 1 from which the dust 2 has been separated, a dust discharge outlet 22 arranged below the furnace gas inlet pipe 11, and a sieve 24 arranged below the furnace gas inlet pipe 11 (inner cylinder 17) and above the dust discharge outlet 22, and having a plurality of openings 23 formed therein.
The exhaust pipe 21 exhausts the furnace top gas 1 from the hopper 13. The exhaust pipe 21 is located above the lower end of the inner pipe (furnace top gas inlet pipe 11). The exhaust pipe 21 is provided on the side surface of the upper part 15.

The dust discharge outlet 22 discharges dust 2 (dust 2 collected in the dust collector 10) from the hopper 13. The dust discharge outlet 22 is located at the bottom of the dust collector 10 (hopper 13). The dust discharge outlet 22 is located at the bottom end of the lower section 16. The dust discharge outlet 22 opens downward from the bottom end of the lower section 16. The dust discharge outlet 22 has a circular shape (a perfect circle) in plan view. As shown in Figure 3, the dust discharge outlet 22 is a circle with an inner diameter L0. Therefore, the minimum cross-sectional length L0min of the dust discharge outlet 22 is the same as the maximum cross-sectional length L0max of the dust discharge outlet 22.

The cross-sectional length of an opening (for example, the dust outlet 22, or the first opening 31 or second opening 32 described below) refers to the length of the cross section of the opening passing through the center of the opening. The minimum cross-sectional length of an opening refers to the smallest cross-sectional length of the opening. The maximum cross-sectional length of an opening refers to the largest cross-sectional length of the opening.

As shown in Figure 1, an exhaust pipe 25 is connected to the dust exhaust port 22. The exhaust pipe 25 is provided with a dust exhaust valve 26 that opens and closes the exhaust pipe 25.

The sieve 24 is disposed over the entire lower portion of the dust collector 10. The sieve 24 is disposed over the entire cross section of the hopper 13 when the hopper 13 is viewed from the vertical direction Z. The sieve 24 is disposed over the entire cross section intersecting the axis of the hopper 13. The sieve 24 is provided in the lower portion 16 of the hopper 13. As shown in FIG. 2, the sieve 24 has a mesh shape. The sieve 24 includes a plurality of rod-shaped members 27. In this embodiment, the rod-shaped members 27 are all pipes (e.g., round pipes, square pipes, etc.). The rod-shaped members 27 may be hollow pipes as in this embodiment, or may be solid rods. In the illustrated example, each rod-shaped member 27 extends linearly, but they may also extend curvedly.

The multiple rod-shaped members 27 include multiple first rod-shaped members 28 and multiple second rod-shaped members 29. In the illustrated example, there are the same number of first rod-shaped members 28 and second rod-shaped members 29. However, the number of first rod-shaped members 28 and second rod-shaped members 29 does not have to be the same. For example, when the opening shape of the first opening 31 described below is rectangular, there does not have to be the same number of first rod-shaped members 28 and second rod-shaped members 29.

The multiple first rod-shaped members 28 each extend in a first direction D1 in the horizontal direction. The multiple first rod-shaped members 28 are arranged at intervals in a second direction D2 that is perpendicular to the first direction D1 in the horizontal direction. The multiple second rod-shaped members 29 each extend in the second direction D2. The multiple second rod-shaped members 29 are arranged at intervals in the first direction D1. The multiple rod-shaped members 27 are arranged in a grid pattern.

In this embodiment, the multiple first rod-shaped members 28 are arranged at equal intervals in the second direction D2, and the multiple second rod-shaped members 29 are arranged at equal intervals in the first direction D1. However, the multiple first rod-shaped members 28 may be arranged at unequal intervals in the second direction D2. The multiple second rod-shaped members 29 may be arranged at unequal intervals in the first direction D1.

The multiple first rod-shaped members 28 and the multiple second rod-shaped members 29 are offset in the vertical direction Z. In this embodiment, all of the first rod-shaped members 28 are arranged on the same plane (hereinafter referred to as the first plane). All of the second rod-shaped members 29 are arranged on the same plane (hereinafter referred to as the second plane). The first plane and the second plane are offset in the vertical direction Z.

Each first rod-shaped member 28 is not in contact with or joined to each second rod-shaped member 29 from one side (upper or lower) in the vertical direction Z. Because each first rod-shaped member 28 is not joined to each second rod-shaped member 29, it becomes easier to replace each first rod-shaped member 28 and each second rod-shaped member 29 individually. However, each first rod-shaped member 28 may be in contact with each second rod-shaped member 29. Furthermore, each first rod-shaped member 28 may be joined to each second rod-shaped member 29 by welding or the like.

An annular member 30 to which the ends of the rod-shaped members 27 are fixed may be provided on the outer periphery of the sieve 24. In this case, the annular member 30 is fitted into the hopper 13, thereby fixing the sieve 24 to the hopper 13.
On the other hand, the annular member 30 may not be provided on the outer peripheral edge of the sieve 24. In this case, for example, the end of the rod-shaped member 27 may be directly joined to the hopper 13 by, for example, welding.

In the sieve 24, some of the multiple openings 23 (hereinafter referred to as first openings 31) are formed between horizontally adjacent rod-shaped members 27. The first openings 31 are formed throughout the entire area of the sieve 24 except for the outer periphery. All of the first openings 31 have the same shape and size. Each first opening 31 is formed between adjacent first rod-shaped members 28 in the second direction D2 and between adjacent second rod-shaped members 29 in the first direction D1. Each first opening 31 is rectangular (square in the illustrated example).

The remaining openings 23 (hereinafter referred to as second openings 32) of the multiple openings 23 are formed along the entire outer periphery (entire circumference) of the sieve 24. If the sieve 24 includes the annular member 30, the second openings 32 are formed between the rod-shaped member 27 and the annular member 30. If the sieve 24 does not include the annular member 30, the second openings 32 are formed between the rod-shaped member 27 and the hopper 13. When the hopper 13 is viewed from the vertical direction Z, the second openings 32 are smaller than the first openings 31. However, the second openings 32 may be larger than the first openings 31.

As shown in FIG. 3, the minimum cross-sectional length L1min and maximum cross-sectional length L1max of the first opening 31 are both smaller than the inner diameter L0 of the dust discharge outlet 22. When the hopper 13 is viewed from the vertical direction Z, the first opening 31 is smaller than the dust discharge outlet 22. In this embodiment, when the hopper 13 is viewed from the vertical direction Z, all of the openings 23 (first openings 31 and second openings 32) are smaller than the dust discharge outlet 22.

On the other hand, all of the openings 23 are larger than the dust 2 (see FIG. 4, etc.). The dust 2 can pass through the sieve 24 (openings 23).
The diameter of the dust 2 contained in the top gas 1 of the blast furnace is, for example, 0.01 to 0.5 mm. The inner diameter L0 of the dust discharge port 22 is, for example, 150 to 300 mm. The minimum cross-sectional length L1min of the first opening 31 is preferably, for example, less than 150 mm.

In this embodiment, the first rod-shaped member 28 and the second rod-shaped member 29 are not on the same plane, so strictly speaking, the cross-sectional length of the opening 23 must also take into account the distance in the vertical direction Z. However, as in this embodiment, when the first rod-shaped member 28 and the second rod-shaped member 29 are only slightly offset in the vertical direction Z (for example, by less than the thickness of the rod-shaped member 27) and can be considered to be essentially on the same plane, the cross-sectional length of the opening 23 can be considered as if the first rod-shaped member 28 and the second rod-shaped member 29 were located on the same plane. In this embodiment, the sieve 24 is mesh-shaped, and the cross-sectional length of the opening 23 is the mesh size of the opening 23.

4 shows a dust collector 10A according to a comparative example. This dust collector 10A does not have a sieve 24. In the dust collector 10A, the top gas 1 and the dust 2 are separated, the dust 2 is stored in a hopper 13, and the top gas 1 is exhausted from an exhaust pipe 21. At this time, the dust discharge valve 26 is closed (the fact that the dust discharge valve 26 is painted black means that the dust discharge valve 26 is closed).
5, the accumulated dust 2 is discharged to the outside from the lower part of the dust collector 10A, for example, about once a day. At this time, the dust discharge valve 26 is open (the dust discharge valve 26 is painted white, which means that the dust discharge valve 26 is open). The discharged dust 2 is collected.
6, in the dust remover 10A according to the comparative example, when lumps 3 fall from the furnace top gas inlet pipe 11, the lumps 3 tend to clog the dust outlet 22. In this case, it becomes difficult for the dust 2 to be discharged from the dust outlet 22. The falling lumps 3 include (1) parts of the refractory material 12 peeled off from the furnace top gas inlet pipe 11, and (2) solidified dust 2 and fumes.

On the other hand, as shown in FIG. 7 , in the dust remover 10 according to this embodiment, the sieve 24 is disposed below the furnace gas inlet pipe 11 and above the dust outlet 22. The sieve 24 is disposed across the entire cross section of the hopper 13 when viewed from the vertical direction Z. Therefore, to reach the dust outlet 22, materials falling from the furnace gas inlet pipe 11 must pass through the sieve 24. As shown in FIG. 3 , the minimum cross-sectional length L1min of the first opening 31 is smaller than the maximum cross-sectional length L0max of the dust outlet 22. Therefore, lumps 3 large enough to block the dust outlet 22 are likely to be caught by the sieve 24. Moreover, in this embodiment, when the hopper 13 is viewed from the vertical direction Z, all of the openings 23 are smaller than the dust outlet 22. Therefore, the lumps 3 are more likely to be caught by the sieve 24. 7, when the lump 3 gets caught on the sieve 24, the lump 3 does not pass through the sieve 24. Therefore, the lump 3 is prevented from blocking the dust discharge port 22.
In this dust collector 10, in order to prevent clogging of the dust discharge port 22 by the lumps 3, the sieve 24 is simply disposed below the furnace gas inlet pipe 11 and above the dust discharge port 22. In other words, unlike the conventional dust collector 10, it is not necessary to erect a tube at the discharge port. Therefore, for example, the sieve 24 can be disposed at a position sufficiently far from the discharge port (for example, 600 mm or more above the dust discharge port 22). Therefore, even if the sieve 24 becomes clogged, the flow near the discharge port is unlikely to be obstructed. Therefore, the dust 2 can be discharged smoothly.

On the other hand, as shown in Figure 8, dust 2 can pass through the sieve 24 (openings 23). Therefore, when the dust discharge valve 26 is opened, the dust 2 passes through the sieve 24 and is discharged from the hopper 13.

2, the sieve 24 includes a plurality of rod-shaped members 27. Moreover, the first openings 31 are formed between the plurality of horizontally adjacent rod-shaped members 27. Therefore, for example, the cross-sectional length and cross-sectional area of the first openings 31 can be set with a high degree of freedom.
Furthermore, the rod-shaped members 27 are pipes, which makes the sieve 24 lightweight. Also, the sieve 24 is made of common materials, which makes it possible to manufacture the sieve 24 inexpensively.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

As in a dust remover 10B according to a first modified example shown in Fig. 9, the sieve 24 may be inclined relative to the horizontal direction. The sieve 24 is inclined relative to a plane perpendicular to the axis of the hopper 13. In the example shown in the figure, the sieve 24 slopes downward toward the right side of the page.
In this case, the lumps 3 received by the sieve 24 tend to gather at a specific location (the right side of the page in the illustrated example) along the inclination of the sieve 24. This makes it easier to remove the lumps 3, for example.

As in a dust remover 10C according to a second modified example shown in Fig. 10C, a manhole 40 may be provided on the side of the hopper 13. The manhole 40 is provided in the lower portion 16. The manhole 40 is disposed above the sieve 24. In the illustrated example, the sieve 24 is inclined toward the manhole 40.
In this case, the worker can remove the lumps 3 on the sieve from the manhole 40. Incidentally, by tilting the sieve 24 toward the manhole 40 as in this embodiment, the lumps 3 become more easily collected in the manhole 40.

As in a dust remover 10D according to a third modified example shown in Figures 11 and 12, a plurality of rod-shaped members 27 may penetrate horizontally through the hopper 13. In the illustrated example, all of the rod-shaped members 27 penetrate horizontally through the hopper 13, but only some of the rod-shaped members 27 may penetrate horizontally through the hopper 13. The rod-shaped members 27 that penetrate horizontally through the hopper 13 can be pulled out horizontally from the hopper 13 and can also be inserted horizontally into the hopper 13 from outside.
In this case, for example, when the rod-shaped member 27 becomes worn or damaged, an operator can remove or attach the rod-shaped member 27 from outside the hopper 13, making replacement work easy.

Furthermore, as in the dust remover 10E according to the fourth modified example shown in FIG. 13, the multiple rod-shaped members 27 may include only first rod-shaped members 28 and not second rod-shaped members 29. In the illustrated example, the sieve 24 is composed only of first rod-shaped members 28. In this case, the first direction D1 is the extension direction of the first rod-shaped members 28. The second direction D2 is the direction perpendicular to the extension direction (hereinafter also referred to as the perpendicular extension direction). The openings 23 are formed either (1) between adjacent first rod-shaped members 28 in the second direction D2 (perpendicular extension direction), or (2) between the first rod-shaped member 28 positioned outermost along the second direction D2 (perpendicular extension direction) and the hopper 13. In this case, the minimum cross-sectional length Lmin of the openings 23 can be defined as the cross-sectional length of the openings 23 in the second direction D2 (perpendicular extension direction).

14, a dust remover 10F according to a fifth modification may further include a steam supply unit 41 and a steam discharge unit 42. The steam supply unit 41 supplies steam into the pipe. The steam discharge unit 42 discharges the steam supplied into the pipe.
In a dry or electric dust remover 10F, if the dust 2 that comes into contact with the sieve 24 is wet, the dust 2 adheres to the sieve 24 and accumulates. If the dust 2 that adheres to the sieve 24 grows large, it may clog the openings 23 of the sieve 24. Furthermore, high-temperature top gas 1 is introduced into the hopper 13 (the temperature of the top gas 1 is approximately 100 to 200°C during normal operation and approximately 600 to 1200°C during blow-through). Therefore, if dust 2 adheres to the sieve 24, the dust 2 receives heat from the top gas 1 and hardens, as if sintered. As a result, the dust 2 becomes more difficult to remove from the sieve 24, making the openings 23 more likely to become clogged.
When the opening 23 of the sieve 24 is blocked, for example, it may be necessary to stop the operation of the blast furnace and clean the dust 2 adhering to the sieve 24 .
Here, the steam supply unit 41 supplies steam (for example, at about 100°C to 300°C) into the pipe. This can promote drying of the dust 2 adhering to the sieve 24. This prevents the dust 2 from growing on the surface of the sieve 24. As a result, the openings 23 of the sieve 24 are less likely to be blocked by the dust 2.

Furthermore, as in the dust remover 10G according to the sixth modified example shown in Figure 15, the sieve 24 may be formed of a chain instead of a rod-shaped member 27. In other words, even if a member such as a chain is deformable, a member that extends linearly when tension is applied will exert the same effect as the rod-shaped member 27. The sieve 24 may also be configured to combine pipes (rod-shaped members 27) and chains. Furthermore, the rod-shaped members 27 may be members other than pipes (for example, round bars, structural steel, etc.).

In the dust collectors 10B to 10G according to the above-described variations, the sieve 24 is inclined, but the sieve 24 does not have to be inclined.

The lower end of the furnace gas introduction pipe 11 does not have to be the inner cylinder 17. For example, the lower end of the furnace gas introduction pipe 11 may be configured to straighten the furnace gas 1 so that the top gas 1 becomes a swirling flow within the hopper 13.

The sieve 24 is not limited to the above configuration. For example, the sieve 24 may be formed from a punched steel plate or mesh. Furthermore, for example, the planar shape of the openings 23 may be circular, polygonal, rectangular, or diamond-shaped. Specifically, the sieve 24 may be a punched steel plate with circular or polygonal punched holes, or a woven mesh with rectangular or diamond-shaped openings 23.

In the above embodiment, when the hopper 13 is viewed from above and below, all of the openings 23 are smaller than the dust discharge outlet 22. However, the present invention can also be appropriately adopted in other configurations in which at least one of the multiple openings 23 is smaller than the dust discharge outlet 22. Furthermore, the present invention can also be appropriately adopted in other configurations in which the minimum cross-sectional length of at least one of the multiple openings 23 is smaller than the maximum cross-sectional length of the dust discharge outlet 22. For example, of the multiple openings 23, the opening 23 located directly below the hopper 13 may be smaller than the dust discharge outlet 22, and the remaining openings 23 may be larger than the dust discharge outlet 22. Furthermore, the minimum cross-sectional length of the opening 23 located directly below may be smaller than the maximum cross-sectional length of the dust discharge outlet 22, and the minimum cross-sectional lengths of the remaining openings 23 may be larger than the maximum cross-sectional length of the dust discharge outlet 22.

The shape of the dust outlet 22 in a plan view does not have to be circular. For example, the shape of the dust outlet 22 in a plan view does not have to be rectangular. In this case, a configuration is appropriately adopted in which the minimum cross-sectional length of the opening 23 is smaller than the maximum cross-sectional length of the dust outlet 22. For example, the minimum cross-sectional length of the opening 23 may or may not be smaller than the minimum cross-sectional length of the dust outlet 22.

In the above embodiment, the dust collector 10 is exemplified as a dust collector 10 for the top gas of a blast furnace. However, the dust collector 10 can also be used for purposes other than the top gas of a blast furnace. Other dust collectors that capture dust 2 contained in the fluid 1 may also be used as the dust collector 10.

In addition, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate, without departing from the spirit of the present invention.

1 Furnace gas 2 Dust 10 Dust collector 11 Furnace gas inlet pipe (inlet section)
13 Hopper 21 Exhaust pipe (fluid discharge section)
22 Dust discharge port 23 Opening 24 Sieve 27 Rod-shaped member 41 Steam supply section Z Up-down direction

Claims (8)

A dust collector for collecting dust contained in a fluid,
an introduction section for introducing a fluid into the dust remover;
a fluid discharge section that discharges the fluid from which dust has been separated out of the fluid introduced from the introduction section;
a dust outlet provided at the bottom of the dust remover for discharging dust collected in the dust remover;
a sieve having a plurality of openings, the sieve being disposed below the introduction portion and above the dust discharge port;
The sieve is disposed over the entire lower surface of the dust collector,
a minimum cross-sectional length of at least one of the plurality of openings is smaller than a maximum cross-sectional length of the dust discharge port;
The sieve includes a plurality of rod-shaped members,
At least some of the openings are formed between the rod-shaped members adjacent to each other in the horizontal direction,
A dust remover , wherein at least some of the rod-shaped members are pipes . A dust collector for collecting dust contained in a fluid,
an introduction section for introducing a fluid into the dust remover;
a fluid discharge section that discharges the fluid from which dust has been separated out of the fluid introduced from the introduction section;
a dust outlet provided at the bottom of the dust remover for discharging dust collected in the dust remover;
a sieve having a plurality of openings, the sieve being disposed below the introduction portion and above the dust discharge port;
The sieve is disposed over the entire lower surface of the dust collector,
a minimum cross-sectional length of at least one of the plurality of openings is smaller than a maximum cross-sectional length of the dust discharge port;
The sieve includes a plurality of first rod-shaped members extending in a first direction among horizontal directions, and a plurality of second rod-shaped members extending in a second direction perpendicular to the first direction,
the plurality of first rod-shaped members are arranged at intervals in the second direction, and the plurality of second rod-shaped members are arranged at intervals in the first direction,
At least some of the openings are formed between adjacent first rod members and adjacent second rod members . The dust remover according to claim 2 , wherein at least some of the first rod-shaped members and the second rod-shaped members are pipes. The dust remover according to claim 1 or 3 , further comprising a steam supply unit that supplies steam into the pipe. The dust remover according to any one of claims 1 to 4 , wherein the sieve is inclined relative to the horizontal direction. The dust remover according to claim 1 , wherein a manhole is provided on a side surface of the dust remover and is positioned above the sieve. The dust remover according to claim 1 , wherein at least some of the rod-shaped members extend horizontally through the dust remover. A dust collector according to any one of claims 1 to 7, wherein each of the multiple openings is smaller than the dust discharge outlet when the dust collector is viewed from above and below.