JP2017087132A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector for a furnace top gas in a blast furnace capable of suppressing a state that dust is not discharged from the dust collector even when a material such as a massive castable refractory and the like is fallen onto the dust collector.SOLUTION: In a dust collector 20 including a hopper 24 storing dust 70, a discharge port 36 disposed at the lower part of the hopper 24, a dust valve 40 opening and closing the discharge port 36 and a cylindrical structure 50 whose side surface is at least a screening surface,: the hopper 24 has a portion becoming wider according to separation from the discharge port 36; one end of the structure 50 is sealed and the other end is open; the other open end of the structure 50 is connected so as to cover the discharge port 36 and the structure 50 is disposed so as to be extended in the hopper 24; and the dust 70 contained in a furnace top gas is separated from the gas and discharged.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dust remover that separates and discharges dust contained in a gas from the gas.

  Various techniques are known as methods for removing dust from gas containing dust. For example, the furnace top gas discharged from the blast furnace contains a relatively large amount of dust, and is led out from the furnace top gas outlet of the blast furnace to the dust remover through the riser pipe and the downcomer pipe. The furnace top gas led to the dust remover separates the furnace top gas and dust in the dust remover. The dust separated from the furnace top gas is stored in the dust remover and is periodically discharged, for example, once a day from an outlet provided in the lower portion of the dust remover. The amount of dust discharged from the dust remover per day is as much as 40 t.

  The riser pipe and downcomer pipe through which the furnace top gas passes are lined with a castable (refractory material) that can withstand high temperatures. A high temperature blast furnace gas close to 1000 ° C. may flow due to blast furnace gas blow-off, etc., and part of the castable (hereinafter sometimes referred to simply as “castable”) is caused by the influence of the high temperature gas or aging. May fall off the inner surface and fall into the dust remover. The dust remover has no problem when discharging dust in powder form, but when discharging a lump such as a castable, it may be caught in the discharge route and may cause shelves. When the castable is shelved on the discharge route, dust accumulates on the castable shelves and the dust is not discharged from the dust remover. When such a situation occurs, the dust valve at the discharge port is opened and closed, or an impact is applied from the outside, so that the shelf hanging state is eliminated. However, if the shelving state is not resolved even if the dust valve is opened or closed or an impact is applied from the outside, it is necessary to open the dust remover and remove the shelved castable. While removing the castable from the dust remover, the blast furnace is suddenly rested (hereinafter, suddenly resting the blast furnace is simply referred to as a sudden rest), so the productivity of the blast furnace decreases.

  A dry dust remover having a bifurcated discharge portion at the bottom is known (Patent Document 1) against dust clogging caused by castable shelves. The dry dust remover provided with such a bifurcated discharge portion can discharge dust from the other discharge portion even if one discharge portion is clogged with a castable shelf. For this reason, even if castable shelves occur in one discharge section, it is not necessary to make the blast furnace suddenly stop.

Japanese Utility Model Publication No. 4-78253

  However, in a blast furnace that has been used for a long period of time, it is known that the amount of castable falling from the piping of the top gas increases. In this case, even in the case of a dry dust remover provided with a bifurcated discharge portion, when castable shelves are generated at both discharge portions, dust is not discharged from the dry dust remover. When such a situation occurs, it is necessary to make the blast furnace suddenly shut down in order to remove castable shelves in at least one discharge section, so that the productivity of the blast furnace decreases.

  Further, when the dust valve is operated while the castable is caught by the dust valve, the castable bites into the dust valve. Engaging the castable dust valve makes it difficult to open and close the dust valve, and makes it impossible to use the dust remover. Even when such a situation occurs, it is necessary to suddenly stop the blast furnace in order to replace the dust valve, and the productivity of the blast furnace decreases. Even if the gas contains dust other than the blast furnace top gas, if the lump is separated from the gas together with the dust in the dust remover, operation will occur if the lump is trapped in the shelves or the valve. The above problem occurs and is not preferable.

  The present invention has been made in view of the above problems, and the object of the present invention is to prevent dust from being discharged from the dust remover even if a massive castable substance or the like falls on the dust remover. An object of the present invention is to provide a dust remover capable of suppressing biting of a substance such as a castable into a dust valve.

The dust remover according to the present invention for solving the above problems is as follows.
(1) A dust remover that separates and discharges dust contained in a gas,
A hopper for storing dust, a dust valve for opening and closing a discharge port formed below the hopper, and a cylindrical structure having at least a side surface as a sieve surface, the hopper from the discharge port The structure has a portion that becomes wider as it goes upward. One end of the structure is sealed and the other end is open. The other open end of the structure is connected to cover the discharge port. A dust remover characterized in that the structure is provided so as to extend into the hopper.
(2) The dust remover according to (1), wherein the structure is provided such that a central axis of the structure is in a vertical direction.
(3) The dust remover according to (1) or (2), wherein the hopper has a side surface inclined so as to become narrower toward the discharge port.
(4) A plurality of discharge ports are provided below the hopper, and the height of the structure is higher than the lowest position among the upper ends of the side surfaces. Dust remover.
(5) The dust-removing device according to any one of (1) to (4), wherein the sealed end surface of the structure is inclined at an angle larger than the repose angle of the dust. vessel.
(6) The discharge port and the structure are both cylindrical, and the structure is provided so as to be coaxial with the discharge port. The inner diameter of the structure is larger than the inner diameter of the discharge port. The dust remover according to any one of (1) to (5), which is large.
(7) The dust remover according to any one of (1) to (6), wherein holes are provided in a staggered pattern on the sieve surface.
(8) The hole is a square, and the length of the long side of the square is 1/3 or less of the diameter of the discharge port. (1) to (7) Dust remover.
(9) The dust remover according to any one of (1) to (7), wherein the hole is a circle, and the diameter of the circle is 1/3 or less of the diameter of the discharge port. .
(10) The dust remover according to any one of (1) to (9), wherein the gas is a top gas generated from a blast furnace.

  According to the present invention, the discharge port of the dust remover is connected to a cylindrical structure whose at least side surface is a sieve surface. Accordingly, even if a material such as castable falls on the dust remover, the structure connected to the discharge port can prevent the material such as castable from entering the discharge port. Thereby, the biting of a substance such as castable into the dust valve is suppressed. In addition, since the cylindrical structure is provided so as to extend into the hopper, even if shelves are generated by a material such as castable, the sieve surface is higher than the position where shelves are generated. Dust is discharged through. Thereby, since it can suppress that dust is no longer discharged | emitted from a dust remover, generation | occurrence | production of the sudden rest wind of a blast furnace can also be suppressed, for example in a blast furnace, As a result, the fall of productivity of a blast furnace can be suppressed.

It is sectional drawing which shows the structure of a blast furnace and its periphery. It is sectional drawing which shows an example of the dust remover. The top view of the structure 50, a side view, and the elements on larger scale of the side are shown. The top view of the structure 60, a side view, and the elements on larger scale of the side are shown. It is sectional drawing which shows the dust remover. It is the elements on larger scale of the dust remover.

Hereinafter, an example of a dust remover according to the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a configuration of a blast furnace 10 and its surroundings. The blast furnace 10 is a furnace for producing hot metal by reducing iron ore using coke. In the blast furnace 10, the iron ore that has been heated and reduced becomes hot metal and is discharged from a tap outlet provided at the bottom of the blast furnace 10. Blast furnace gas generated by the combustion of coke and reduction of iron ore is discharged from the top of the blast furnace as the top gas. The main components of the furnace top gas are N ₂ , CO ₂ , CO, and H ₂ . Further, the furnace top gas contains a large amount of dust 70 composed of fine particles of raw material charged into the blast furnace 10. In addition, the arrow in FIG. 1 has shown the ventilation route of tuyere blowing gas, blast furnace gas, and furnace top gas.

  The furnace top gas is introduced into the dust remover 20 through the riser pipe 14 and the downcomer pipe 16 from the furnace top gas outlet 12 of the blast furnace. The temperature of the furnace top gas is usually about 150 ° C., but sometimes close to 1000 ° C. For this reason, the insides of the ascending pipe 14 and the descending pipe 16 are lined with a castable (refractory material) that can withstand high temperatures.

  The furnace top gas introduced into the dust remover 20 is separated into the furnace top gas and the dust 70 in the dust remover 20. The dust 70 separated from the furnace top gas is stored in the dust remover 20. The dust 70 stored in the dust remover 20 is discharged to the outside from below the dust remover 20 once a day. The discharged dust 70 is collected and reused as, for example, a sintering raw material. On the other hand, the furnace top gas from which the dust 70 has been removed is exhausted from the exhaust pipe 26. The exhausted top gas is transferred to a gas cleaning process and cleaned, and then used for a relatively low temperature combustion application such as fuel for a steam boiler.

  FIG. 2 is a cross-sectional view showing an example of the dust remover 20. The dust remover 20 includes an introduction pipe 22 that introduces the furnace top gas into the dust remover 20, a hopper 24 that stores the dust 70, and an exhaust pipe 26 that exhausts the furnace top gas from which the dust 70 has been separated. The hopper 24 includes a central portion 28 that is a hollow cylinder, an upper portion 30 that is hollow and narrows upward through the cylinder in two stages, and is hollow and narrows downward. The lower part 32 which is a cone is connected and comprised. The introduction pipe 22 is provided so as to enter the hopper 24 from the outside of the upper center of the upper portion 30. The exhaust pipe 26 is provided connected to the side surface of the cylindrical portion of the upper portion 30 located above the lower end position of the introduction pipe 22. Two manholes 34 are provided on the peripheral surface of the lower portion 32. The manhole 34 seals a work hole for performing work in the hopper 24. In addition, the arrow in FIG. 2 has shown the ventilation route of the furnace top gas.

  A discharge port 36 is formed at the lowermost portion of the lower portion 32. A dust valve 40 that seals the discharge port 36 is provided below the discharge port 36. The dust valve 40 includes three valves arranged side by side in the vertical direction.

  The discharge port 36 is provided with a cylindrical structure 50. The cylindrical structure 50 has a shape in which one end is sealed and the other end is opened. The inner diameter of the structure 50 is larger than the inner diameter of the discharge port 36, and the other end of the structure 50 is connected so as to cover the discharge port 36. In the dust remover 20 shown in FIG. 2, the inner diameter of the discharge port 36 is, for example, 40.0 (mm), and the inner diameter of the structure 50 is, for example, 406.4 (mm).

  The structure 50 is provided so as to extend from the discharge port 36 into the hopper 24 so that the central axis is in the vertical direction. Furthermore, the peripheral surface of the structure 50 and the sealed one end surface are sieve surfaces. Therefore, in the dust remover 20 shown in FIG. 2, the dust 70 stored in the hopper 24 is discharged from the discharge port 36 through the sieve surface of the structure 50 due to the weight of the dust 70.

  The furnace top gas introduced into the dust remover 20 is introduced into the dust remover 20 through the introduction pipe 22. The furnace top gas introduced from the introduction pipe 22 is discharged downward from the introduction pipe 22. Since the lower end position of the introduction pipe 22 is located below the exhaust pipe 26 from which the furnace top gas is exhausted, the flow of the furnace top gas discharged downward changes toward the exhaust pipe 26. That is, the flow direction of the furnace top gas changes by 180 ° from below to above. On the other hand, since the dust 70 contained in the furnace top gas moves downward together with the furnace top gas discharged downward, it continues to move downward due to its inertial force. Thus, while the direction of the flow of the furnace top gas changes by 180 ° from below to above, the dust 70 continues to move downward, so that the dust 70 is separated from the furnace top gas. The furnace top gas is exhausted from the exhaust pipe 26, and the dust 70 is deposited below the hopper 24. The dust 70 accumulated below the hopper 24 is discharged from the discharge port 36 by opening the dust valve 40.

  By the way, the castable debris which is a part of the castable provided in the above-described ascending pipe 14 or descending pipe 16 falls off the ascending pipe 14 or descending pipe 16 and falls into the dust remover 20. This is because the castable spalling occurs due to the passage of the high-temperature furnace top gas, causing the castable to crack, and the castable debris generated thereby falls to the dust remover 20. The castable that has fallen on the dust remover 20 is caught in the narrowed region of the lower portion 32, and shelving due to the castable occurs. Here, the shelf suspension refers to a phenomenon in which the castable is caught in a narrow area of the hopper 24, and the dust 70 is accumulated on the castable and does not fall. In this way, when shelving by castable occurs, the dust 70 does not fall by its own weight. For this reason, when shelving by castable occurs, the dust 70 stored in the hopper 24 is not discharged from the discharge port 36 even if the dust valve 40 is opened.

  In the dust remover 20 in the present embodiment, the structure 50 is connected so as to cover the discharge port 36. The structure 50 is provided in the hopper 24 so as to extend upward from the discharge port. Therefore, even if shelving due to castable occurs, if the position of the side surface of the structure 50 or the sealed one end surface is higher than the position where the shelving of the castable occurs, the side surface or end surface of the structure 50 Since dust can pass through the provided sieve surface, it can be discharged from the dust discharge port 36 stored in the hopper 24. In order to exhibit this effect suitably, it is preferable that the maximum height of the sieving surface of the structure 50 is at least three times the diameter of the discharge port.

  Further, the lower portion 32 has a conical shape that narrows downward, and becomes wider from the discharge port 36 upward. For this reason, as the distance from the discharge port 36 increases, it becomes difficult for the rack to be cast by the castable.

  The structure 50 is provided so as to extend into the hopper 24, and the hopper 24 is formed so as to become wider as the distance from the discharge port 36 increases, so that the side surface of the structure 50 and the sealed one end surface are discharged. The rack can be placed at a position where it is difficult for the rack to be lifted away from the outlet 36 by the castable. Thereby, since it is possible to suppress the occurrence of castable shelves above the side surface of the structure 50 and the sealed one end surface, the dust 70 is not discharged from the discharge port 36 by using the dust remover 20. Can be suppressed.

  Further, in the dust remover 20, the structure 50 is provided so as to extend into the hopper 24, and the hopper 24 has a side surface that is inclined so as to become narrower toward the discharge port. Thereby, the gravity of the dust which the sieve surface of the structure 50 receives can be reduced. When the sieve surface of the structure 50 is clogged, the inside of the structure 50 is emptied, so that the side surface and one end surface of the structure 50 receive the gravity of the dust 70 stored in the hopper 24. In this case, the gravity generated by the dust 70 stored in the hopper 24 is supported not only by the side surface of the structure 50 but also by the inclined side surface of the lower portion 32. That is, of the gravity generated by the dust 70, the gravity received by the structure 50 is the gravity in which the vertical drag received by the dust 70 from the inclined side surface of the lower portion 32 is reduced.

  On the other hand, when the sieve surface is horizontally provided above the discharge port 36, when the dust surface 70 is clogged and the lower side of the sieve surface is empty, dust 70 accumulates on the sieve surface. Receives all of the gravity generated by the dust 70. For this reason, even if the amount of dust 70 deposited on the sieve surface is the same as when the structure 50 is provided, the sieve surface may buckle. As described above, the structure 50 is provided so as to extend into the hopper 24, and the hopper 24 has a side surface that is inclined so as to become narrower toward the discharge port. The gravity of 70 is reduced. Thereby, it can suppress that the sieve surface of the structure 50 buckles by the gravity of the dust 70. FIG. In addition, it is preferable that the inclination angle of the side surface inclined so as to narrow toward the discharge port in the hopper 24 is larger than the repose angle of the dust 70.

  FIG. 3 shows a top view, a side view, and a partially enlarged view of the side surface of the structure 50. The structure 50 has a cylindrical shape as described above, and has one end sealed and the other end open. In the example shown in FIG. 3, the upper side of the structure 50 is one end sealed, and the lower side is the other end opened. Moreover, the surface of the sealed one end is inclined with respect to the horizontal direction, and the inclination angle of the surface is, for example, 50 ° with respect to the horizontal plane. It is preferable that the inclination angle of the one end surface is larger than the repose angle of the dust 70. Thereby, when the sieve surface of one end surface is clogged, it can suppress that the dust 70 accumulates on the said one end surface.

  In addition, square holes 52 are provided in a staggered pattern on the sieve surface of the structure 50. Thus, by providing the holes 52 in a staggered manner, the buckling strength of the circumferential surface and one end surface of the structure 50 can be improved as compared with the case where the holes 52 are provided in a lattice shape.

  Furthermore, it is preferable that the dimension of the long side in the square hole 52 provided in the sieve surface is 1/3 or less of the diameter of the discharge port 36. For example, when the diameter of the discharge port 36 in the dust remover 20 is 40.0 (mm), the long side of the hole 52 is preferably 133.3 (mm) or less, and in the example shown in FIG. The horizontal dimension 54 that is the long side is, for example, 100.0 (mm). In addition, the vertical dimension 55 which is a short side is 80.0 (mm), for example.

  When the size of the castable was changed to check whether shelves were generated, it was confirmed that if the size of the castable was 1/3 or less of the diameter of the outlet, it could be discharged from the outlet without the occurrence of shelves. ing. For this reason, if the dimension of the long side of the hole 52 is set to 1/3 or less of the diameter of the discharge port 36, it is possible to prevent a castable larger than 1/3 of the diameter of the discharge port 36 from entering the discharge port 36. Thereby, it is possible to prevent the shelf from being castable from being generated at the discharge port 36 and the dust valve 40 below it, and further, the biting of the castable into the dust valve 40 can be suppressed.

  In the structure 50, the material of the structure 50 is SUS304, the horizontal interval 56 between the holes 52 and 52 is 58.0 (mm), and the vertical interval 57 is 45.0 (mm). It was. The thickness of the side surface of the structure was 21.4 mm. These dimensions are merely examples, and the dust 70 generated in one day operation of the blast furnace 10 is stored in the hopper 24 in consideration of the material and thickness of the structure 50. What is necessary is just to set in the range which the structure 50 does not buckle and deform | transform by the gravity received from 70, and the collision of the castable which fell. In addition, if the thickness of the side surface of the structure is too thin, there is a concern about insufficient strength or abrasion due to dust, and if it is too thick, the structure becomes excessively heavy. A preferable thickness range is 10 mm to 50 mm, and more preferably 20 mm to 40 mm. In addition, if the distance between the holes is too small, the strength of the structure becomes insufficient or there is a concern about abrasion due to dust. Therefore, the distance between the holes is preferably 20 mm or more, and particularly preferably 45 mm or more. . Moreover, since the area of an opening will reduce when the space | interval of a hole is too large, the space | interval of a preferable hole and a hole is 20 mm-100 mm, More preferably, it is 45 mm-100 mm.

  In the present embodiment, an example in which a rectangular hole 52 is provided in the structure 50 is shown. However, the hole 52 is not limited to a rectangle, and may be a square. When the hole is square, the dimension of one side may be 1/3 or less of the discharge port diameter. Moreover, in order to prevent corrosion, the example which used SUS304 as a material of the structure 50 was shown. However, the material of the structure 50 is not limited to SUS304, and stainless steel other than SUS304, or ordinary steel may be used if it is not a corrosive atmosphere.

  Moreover, in this embodiment, the example in which the rectangular hole 52 was provided in the structure 50 was shown. However, the hole 52 is not limited to a rectangle, and may be a circle. FIG. 4 shows a top view, a side view, and a partially enlarged view of the side surface of the structure 60. Circular holes 62 are provided in a staggered pattern on the sieve surface of the structure 60. The circular hole 62 provided in the sieving surface preferably has a diameter 64 of 1/3 or less of the discharge port diameter. In the example shown in FIG. 4, the diameter 64 of the hole 62 is 100 (mm). In the example shown in FIG. 4, the hole 62 is circular, but the hole is not limited to a circle and may be an ellipse. When the hole is an ellipse, the major axis of the ellipse may be 1/3 or less of the discharge port diameter.

  Moreover, in this embodiment, the example of the structure 50 and the structure 60 which made the sealed one end surface the sieve surface was shown. However, one end surface of the structure 50 and the structure 60 may not be a sieve surface, and at least the peripheral surface of the structure 50 may be a sieve surface. By making the one end surface of the structure 50 and the structure 60 into a sieve surface, the area of a sieve surface can be enlarged and the passage amount of the dust 70 can be increased. Further, the entire side surface of the structure does not have to be a sieve surface. For example, the upper part of the structure is highly likely to collide directly with the castable that has fallen. Therefore, in order to secure the strength of the upper part of the structure, the upper part of the structure may have a structure without a hole. You may make it reduce a number.

  Moreover, in this embodiment, the structure 50 and the structure 60 showed the example which is a cylinder. However, the structure 50 and the structure 60 are not limited to cylinders, and may be cylinders having a polygonal cross section.

  Furthermore, in this embodiment, the example which has the side surface which inclined so that the hopper 24 might become narrow toward the discharge port 36 was shown. However, the fact that the hopper 24 has a side surface that is inclined so as to narrow toward the discharge port 36 is merely an example of a preferable configuration, and the hopper 24 is a portion that becomes wider from the discharge port 36 upward. As long as it has. Therefore, the hopper 24 may be formed so as to widen, for example, in a stepped manner as it goes upward from the discharge 36.

  Next, another embodiment of the dust remover will be described with reference to FIG. FIG. 5 is a cross-sectional view showing the dust remover 100. In FIG. 5, the same components as those in FIG. In the dust remover 100, the hopper 24 has a lower cone region 102 formed at the bottom. In addition, two discharge ports 104 and 106 are formed in the lower cone region 102. In the dust remover 100, the structure 50 is provided so as to cover the discharge port 104 that is one of the discharge ports 104 and 106.

  FIG. 6 is a partially enlarged view of the dust remover 100. The lower cone region 102 in the dust remover 100 has a side surface 108 and a side surface 110 which are inclined so as to narrow toward the two discharge ports 104 and 106 formed at the lowermost portion.

  In the dust remover 100, the height of the structure 50 is higher than the lowest position among the upper ends of the side surface 108 and the side surface 110. Here, the lowest position among the upper ends of the side surface 108 and the side surface 110 is the upper end position of the side surface 108 and is a position indicated by a dotted line 112 in FIG. The dimension 114 from the discharge port 104 indicating the upper end position of the side surface 108 to the upper end position of the side surface 108 is, for example, 960.0 (mm), and the discharge port 104 indicating the height of the structure 50 has a structure 50. The dimension 116 up to the upper end of the one end face is, for example, 1694.0 (mm).

  The area below the dotted line 112 in the lower cone area 102 is a narrow area. For this reason, when a castable falls to the hopper 24, the shelf suspension by the castable mainly occurs below the dotted line 112. For this reason, if the height of the structure 50 is higher than the dotted line 112, even if shelves are generated below the dotted line 112, the dust 70 accumulated thereon passes through the sieve surface of the structure 50. Can be discharged. As described above, even if shelf-shelfing due to castability occurs, the dust 70 can be discharged from the discharge port 104, so that it is possible to prevent the dust 70 from being discharged from the discharge port 104.

  In the example shown in FIG. 6, since the entire peripheral surface and one end surface of the structure 50 are sieve surfaces, the height of the structure is set to the height 114. However, when the sieving surface is not provided on all the structures 50, the highest position of the portion where the sieving surface is provided may be the height of the structure 50.

  Further, in the present embodiment, an example in which both the dust remover 20 and the dust remover 100 are applied to a blast furnace top gas dust remover has been described. However, the dust remover described in this embodiment is not limited to the dust remover of the top gas of the blast furnace, and can be applied to various dust removers that separate dust and lump from gas. For example, the present invention can also be applied to a dust remover that separates dust and lump from air in a dust collector that sucks dust and lump.

  Using the dust remover 100 shown in FIG. 5, the blast furnace was operated once a day while discharging the dust 70 from the two discharge ports 104 and 106 for two years. As a result, in the dust remover 100 provided with the structure 50, the dust 70 was not discharged from the dust remover 100 after two years of blast furnace operation. When the inside of the dust remover 100 was confirmed, castables having a size exceeding 100 mm were scattered around the structure 50. Thereby, it was confirmed that the clogging of the discharge port 104 was suppressed by the structure 50. Further, the castable dust valve 40 was not caught in the discharge port 104.

  On the other hand, in the dust remover before the structure 50 is provided, the state in which the dust 70 is not discharged from the dust remover occurs 12 times in one year of operation, and two of them are subjected to impact from the outside or Even if the dust valve 40 was opened or closed, it did not recover, and the blast furnace was suddenly suspended. Thus, by using the dust remover 100 provided with the structure 50, it is possible to suppress the dust 70 from being discharged, thereby suppressing the sudden blast of the blast furnace, resulting in a decrease in productivity of the blast furnace. It was confirmed that it can be suppressed.

DESCRIPTION OF SYMBOLS 10 Blast furnace 12 Furnace top gas extraction port 14 Climbing pipe 16 Descent pipe 20 Dust remover 22 Introducing pipe 24 Hopper 26 Exhaust pipe 28 Center part 30 Upper part 32 Lower part 34 Manhole 36 Exhaust port 40 Dust valve 50 Structure 52 Hole 54 Horizontal dimension 55 Vertical dimension 56 Spacing 57 Spacing 60 Structure 62 Hole 64 Diameter 70 Dust 100 Dust remover 102 Lower cone area 104 Discharge port 106 Discharge port 108 Side surface 110 Side surface 112 Dotted line 114 Size 116 Size

Claims (10)

A dust remover that separates and discharges dust contained in a gas,
A hopper for storing the dust;
A dust valve for opening and closing a discharge port formed below the hopper;
A cylindrical structure having at least a side surface as a sieve surface;
With
The hopper has a portion that becomes wider from the outlet to the upper side,
One end of the structure is sealed and the other end is open. The other open end of the structure is connected to cover the discharge port and the structure extends into the hopper. A dust remover characterized by being provided.   The dust remover according to claim 1, wherein the structure is provided such that a central axis of the structure is in a vertical direction.   The dust remover according to claim 1 or 2, wherein the hopper has a side surface that is inclined so as to become narrower toward the discharge port.   4. The dust remover according to claim 3, wherein a plurality of discharge ports are provided below the hopper, and the height of the structure is higher than a lowest position among upper ends of the side surfaces. .   The dust remover according to any one of claims 1 to 4, wherein a surface of the sealed one end of the structure is inclined at an angle larger than a repose angle of the dust.   The discharge port and the structure are both cylindrical, and the structure is provided so as to be coaxial with the discharge port, and the inner diameter of the structure is larger than the inner diameter of the discharge port. The dust remover according to any one of claims 1 to 5, characterized in that:   The dust remover according to any one of claims 1 to 6, wherein holes are provided in a staggered pattern on the sieve surface.   8. The dust remover according to claim 1, wherein the hole is a square, and a dimension of a long side of the square is 1/3 or less of a diameter of the discharge port. .   The dust removing device according to any one of claims 1 to 7, wherein the hole is a circle, and the diameter of the circle is 1/3 or less of the diameter of the discharge port.   The dust remover according to any one of claims 1 to 9, wherein the gas is a top gas generated from a blast furnace.

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