Dust treatment facility

Abstract

To freely adjust a position where a processed gas vaporized in a rotary kiln is sucked in by a suction tube.SOLUTION: When a zinc-containing processed gas G produced by heating zinc-containing dust D in a rotary kiln 10 is sucked in by a suction tube 30 and is introduced into a recovery device provided at the outside of the rotary kiln, an inner circumference of a first guide part 32 of the suction tube extended from a suction port 31 of the suction tube 30 to the outside along the axial direction of the rotary kiln is provided with an inner circumferential tube 35 movably in the axial direction of the rotary kiln, the inner circumferential tube is moved by movement means 40, and a length of the inner circumferential tube to be projected from the suction port of the suction tube to an introduction side is adjusted.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a dust treatment system that introduces zinc-containing dust, such as electric furnace steel dust, into a rotating rotary kiln through an inlet on one side thereof, heats the dust, and vaporizes the zinc-containing components contained in the dust while moving the dust to the discharge side on the other side of the rotary kiln. The vaporized treatment gas is guided from the discharge side of the rotary kiln through a suction pipe inserted into the rotary kiln to a recovery device installed outside the rotary kiln, and the zinc-containing components are recovered from the vaporized treatment gas by the recovery device. In particular, the present invention is characterized by the fact that the position at which the vaporized treatment gas is sucked by the suction pipe within the rotary kiln can be freely adjusted, and that when the vaporized treatment gas is guided to the outside through the suction pipe, if the zinc-containing components contained in the vaporized treatment gas adhere to the suction pipe, the adhesions to the suction pipe can be easily removed. [Background technology]

[0002] Traditionally, rotary kilns have been used to produce anhydrous lithium hydroxide, as shown in U.S. Patent No. 5,629,992, and to recover desired materials from vehicle tires, as shown in U.S. Patent No. 5,629,992.

[0003] Furthermore, as shown in Patent Documents 3 and 4, conventionally, dust containing zinc and the like, such as electric furnace steelmaking dust, is introduced into a rotating rotary kiln from an inlet on one side of the kiln, heated, and moved to the discharge side on the other side of the kiln, vaporizing the zinc-containing components contained in the dust. The vaporized treatment gas is then led to the outside, and the zinc-containing components are recovered from the vaporized treatment gas by a recovery device.

[0004] Patent Document 4 shows a system in which components containing zinc contained in dust are vaporized in a rotary kiln as described above, a suction pipe is inserted into the rotary kiln from the discharge side of the rotary kiln, and the vaporized treatment gas is guided from the suction port of the suction pipe through the suction pipe to a recovery device installed outside the rotary kiln, whereby the components containing zinc are recovered from the vaporized treatment gas.

[0005] In the device shown in Patent Document 4, the suction pipe is inserted into the rotary kiln, and the position of the suction port through which the vaporized treatment gas is sucked by the suction pipe is fixed.However, if the position at which the zinc-containing components are vaporized changes due to changes in the conditions for heating the zinc-containing dust in the rotary kiln, there is a problem in that it is not possible to change the position at which the vaporized treatment gas is sucked by the suction pipe and suck it in at the appropriate position.

[0006] Furthermore, Patent Document 4 shows various types of deposit removal devices that remove deposits that have adhered to the inner surface of the suction tube, but there is also the problem that it is difficult to completely remove deposits that have adhered to the inner surface of the suction tube, and it takes a long time to remove the deposits. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2018-70424 [Patent Document 2] Special Publication No. 2002-538003 [Patent Document 3] Japanese Patent Publication No. 2022-123246 [Patent Document 4] Japanese Patent Application Laid-Open No. 2024-19771 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0008] The present invention aims to solve the above-mentioned problems in dust treatment equipment, in which zinc-containing dust is introduced into a rotating rotary kiln from an inlet on one side thereof and heated, and then moved to the discharge side on the opposite side of the rotary kiln, vaporizing the zinc-containing components contained in the dust; a suction tube is inserted into the rotary kiln from the discharge side of the rotary kiln; the vaporized treatment gas is guided through the suction tube from the suction port of the suction tube to a recovery device installed outside the rotary kiln; and the zinc-containing components are recovered from the vaporized treatment gas by the recovery device.

[0009] In particular, the present invention aims to make it possible to change the position at which the vaporized treatment gas is sucked in by the suction pipe so that the vaporized treatment gas can be sucked in at an appropriate position even if the position at which the zinc-containing components are vaporized changes due to a change in the conditions for heating the zinc-containing dust in the rotary kiln in the dust treatment equipment as described above, and to easily and cleanly remove any deposits that have adhered to the inner surface of the suction pipe, etc. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, in the dust treatment equipment of the present invention, dust containing zinc is introduced into the rotary kiln from an inlet on one side of the rotating rotary kiln and heated, and then moved to the discharge side on the opposite side of the rotary kiln while vaporizing the zinc-containing components contained in the dust.In this dust treatment equipment, a suction tube is inserted into the rotary kiln from the discharge side of the rotary kiln, and the vaporized treatment gas is led through the suction port of the suction tube to a recovery device provided outside the rotary kiln, and the zinc-containing components are recovered from the vaporized treatment gas by the recovery device.In this dust treatment equipment, an inner pipe is provided on the inner circumference of a first guide part of the suction pipe, which extends from the suction port to the outside of the rotary kiln along the axial direction of the rotary kiln, so that it can be moved in the axial direction of the rotary kiln, and the length of the inner pipe protruding from the suction port of the suction tube to the introduction side can be adjusted.

[0011] In the dust treatment equipment of the present invention, as described above, an inner pipe is arranged on the inner periphery of the first guide section of the suction pipe, which extends from the suction port along the axial direction of the rotary kiln to the outside of the rotary kiln, so that the inner pipe can be moved in the axial direction of the rotary kiln, and the length of the inner pipe protruding from the suction port of the suction pipe to the introduction side can be adjusted.Therefore, even if the position at which the zinc-containing components are vaporized changes due to changes in the conditions for heating the zinc-containing dust in the rotary kiln, the inner pipe can be moved to change the position at which the vaporized treatment gas is sucked in, so that the vaporized treatment gas can be sucked in at an appropriate position.

[0012] Furthermore, in the dust treatment equipment according to the present invention, an outlet for removing the inner pipe from the first guide section and a lid for opening and closing the outlet can be provided at the end of the first guide section opposite the suction port of the suction pipe. In this way, if components containing zinc contained in the vaporized treatment gas adhere to the inner surface of the inner pipe provided on the inner periphery of the first guide section of the suction pipe, the inner pipe can be moved toward the outlet, the lid can be removed from the outlet, the inner pipe can be removed from the outlet, and the removed inner pipe can be cleaned to remove the deposits, while a new inner pipe can be inserted into the first guide section through the outlet and set in a predetermined position within the first guide section, and the outlet can be closed with the lid, making maintenance easy.

[0013] Furthermore, the dust treatment facility according to the present invention can be provided with a moving means for moving the inner pipe attached to the inner periphery of the first guide section in the axial direction of the rotary kiln. By providing such a moving means, the inner pipe attached to the inner periphery of the first guide section of the suction pipe can be moved in the axial direction of the rotary kiln by the moving means, making it possible to easily adjust the length of the inner pipe that protrudes from the suction port of the suction pipe to the introduction side. Furthermore, if an outlet is provided as described above, the inner pipe can be moved to the outlet and removed from the outlet.

[0014] Here, the moving means can be, for example, a means for inserting a control rod into the first guide section from the end of the first guide section opposite the suction port of the suction pipe, attaching the tip of the control rod to the inner pipe, and sliding the control rod protruding from the end of the first guide section in the axial direction of the rotary kiln from the outside to move the inner pipe in the axial direction of the rotary kiln. Furthermore, if an outlet is provided at the end of the first guide section as described above and a lid member for opening and closing the outlet is provided, the control rod can be inserted into the first guide section through a hole in the lid member. The moving means is not limited to the above.

[0015] Furthermore, the dust treatment facility according to the present invention may be provided with a cleaning means for blowing cleaning gas into the first guide portion on the suction port side of the inner pipe while the inner pipe is moved closer to the discharge side of the rotary kiln than the suction port of the suction pipe to clean deposits adhering to the inner pipe. In this way, by moving the inner pipe closer to the discharge side of the rotary kiln than the suction port of the suction pipe and blowing cleaning gas into the first guide portion on the suction port side of the inner pipe using the cleaning means, deposits adhering to the inner pipe can be easily cleaned. [Effects of the Invention]

[0016] In the dust treatment equipment of the present invention, as described above, an inner pipe is provided on the inner circumference of the first guide section of the suction pipe, which extends from the suction port along the axial direction of the rotary kiln to the outside of the rotary kiln, so that the inner pipe can be moved in the axial direction of the rotary kiln, and the length of the inner pipe protruding from the suction port of the suction pipe to the introduction side can be adjusted.Therefore, even if the position at which the zinc-containing components are vaporized changes due to changes in the conditions for heating the zinc-containing dust in the rotary kiln, the inner pipe can be moved to change the position at which the vaporized treatment gas is sucked in, so that the vaporized treatment gas can be sucked in at an appropriate position.

[0017] In addition, in the dust treatment equipment of the present invention, if an outlet for removing the inner circumferential tube from the first guide section and a lid for opening and closing the outlet are provided at the end of the first guide section opposite the suction port of the suction tube, when zinc-containing components contained in the vaporized treatment gas adhere to the inner surface of the inner circumferential tube attached to the inner periphery of the first guide section of the suction tube, the inner circumferential tube can be moved toward the outlet, the lid can be removed from the outlet, the inner circumferential tube can be removed through the outlet, and the removed inner circumferential tube can be cleaned to remove the deposits, making it easy to clean and remove the deposits from the inner circumferential surface of the suction tube. Furthermore, maintenance time can be shortened by inserting a new inner circumferential tube into the first guide section through the outlet, setting it in a predetermined position within the first guide section, and closing the outlet with the lid. [Brief explanation of the drawings]

[0018] [Figure 1] In a dust treatment facility according to an embodiment of the present invention, dust containing zinc is heated in a rotary kiln to vaporize the zinc-containing components contained in the dust, and the vaporized treatment gas is guided to a recovery device located outside the rotary kiln through a suction pipe inserted into the rotary kiln from the discharge side of the rotary kiln.This is a schematic explanatory diagram showing a state in which an inner pipe is arranged on the inner circumference of a first guide portion of the suction pipe extended from the suction port to the outside of the rotary kiln along the axial direction of the rotary kiln, so that the inner pipe is movable in the axial direction of the rotary kiln. [Figure 2] In the dust treatment equipment according to the embodiment, in order to remove deposits adhering to the inner surface of the inner tube, an outlet is provided at the end of the first guide section opposite the suction port of the suction tube, and a lid material is provided to open and close the outlet, and this is a schematic explanatory diagram showing the state in which the lid material is opened and the inner tube is taken out from the outlet to the outside. [Figure 3] In the dust treatment equipment according to the above embodiment, (A) is a schematic explanatory diagram showing an example of a moving means for moving the inner circumferential pipe provided on the inner periphery of the first guide part of the suction pipe in the axial direction of the rotary kiln, and (B) is a cross-sectional view of the moving member mounting plate. [Figure 4] This is a schematic partial explanatory diagram showing an example of a dust processing equipment according to the above embodiment, in which the inner pipe is moved to a position away from the suction port within the first guide section of the suction pipe, cleaning gas is blown into the inner pipe through a gas ejection pipe provided between the suction port and the tip of the inner pipe to remove deposits adhering to the inner surface of the inner pipe, and the removed deposits are guided into the second guide section through an inlet connecting the first guide section and the second guide section. [Figure 5] This is a schematic partial explanatory diagram showing an example of a dust processing equipment according to the embodiment, in which the first guide section is extended further on the side opposite the suction port than the inlet connecting the first guide section and the second guide section, and the inner tube is moved into the first guide section on the side opposite the suction port than the inlet of the second guide section, and then the cover material of the removal port is opened and the inner tube is removed to the outside through the removal port. BEST MODE FOR CARRYING OUT THE INVENTION

[0019] Hereinafter, a dust treatment facility according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that the dust treatment facility according to the present invention is not limited to the embodiment shown below, and can be appropriately modified and implemented within the scope of the invention.

[0020] In the dust treatment facility according to this embodiment, as shown in FIGS. 1 and 2, a cylindrical rotary kiln 10 is rotated by a rotating device (not shown), and a material introduction section 11 is provided on one axial side of the rotary kiln 10. Dust D containing zinc, such as electric furnace steel dust, which is the material to be treated, is introduced into the rotary kiln 10 by a dust supply device 20 through the material introduction section 11 together with coke C, which serves as a reducing agent.

[0021] In addition, a heating device 12 for indirectly heating the interior of the rotary kiln 10 is provided on the outer periphery of the rotary kiln 10, and the dust D and coke C are mixed inside the rotating rotary kiln 10 while being indirectly heated by the heating device 12, and then moved to the discharge side of the rotary kiln 10, opposite the introduction side.

[0022] Here, when the dust D and coke C charged into the rotary kiln 10 are mixed and indirectly heated as described above, the dust D is reduced, and the zinc-containing components contained in the dust D are vaporized, generating treated gas G.

[0023] Then, after the dust D has been heated as described above to vaporize the zinc-containing components contained in the dust D and generate treated gas G, the residue of the dust D is discharged from an outlet 13 on the discharge side of the rotary kiln 10 to a residue recovery section 14, where the residue is recovered in a recovery container (not shown) provided below the section.

[0024] Meanwhile, a suction pipe 30 is inserted into the rotary kiln 10 from the discharge side of the rotary kiln 10, and the treated gas G containing zinc vaporized in the rotary kiln 10 as described above is sucked into the suction pipe 30 from the suction port 31 of the suction pipe 30 by a suction device (not shown).The treated gas G is then guided through the first guide section 32 and the second guide section 33 of the suction pipe 30 to a recovery device 60 such as a bag filter provided outside the rotary kiln 10, and components containing zinc are recovered from the treated gas G by this recovery device 60, and the treated gas G which no longer contains zinc is discharged.

[0025] Here, in the dust treatment equipment of this embodiment, the first guide section 32 of the suction pipe 30 is extended from inside the rotary kiln 10 to the outside along the axial direction X of the rotary kiln 10, and the first guide section 32 extended outside the rotary kiln 10 and the second guide section 33 are connected by an inlet 34, so that the treatment gas G is guided from the first guide section 32 of the suction pipe 30 through the inlet 34 to the second guide section 33, and then through this second guide section 33 to the recovery device 60.

[0026] In the dust treatment facility according to this embodiment, an inner circumferential pipe 35 is provided on the inner periphery of the first guide section 32 of the suction pipe 30 so as to be movable in the axial direction X of the rotary kiln 10, and the length of the inner circumferential pipe 35 projecting from the suction port 31 of the suction pipe 30 to the introduction side can be adjusted. The position of the inner circumferential pipe 35 may also be fixed.

[0027] In this way, by adjusting the length of the inner pipe 35 that protrudes from the suction port 31 of the suction pipe 30 to the introduction side, even if the position where the zinc-containing components are vaporized and the treatment gas G is generated changes due to a change in the conditions for heating the zinc-containing dust D in the rotary kiln 10, the position where the vaporized treatment gas G is sucked in by the inner pipe 35 can be changed, and the vaporized treatment gas G can be sucked in at an appropriate position.

[0028] In addition, in the dust processing equipment according to this embodiment, an outlet 36 for removing the inner circumferential tube 35 from the first guide section 32 is provided at the end of the first guide section 32 opposite the suction port 31 of the suction pipe 30, and a lid 37 for opening and closing this outlet 36 is provided.

[0029] Here, as described above, the inner pipe 35 sucks in the treatment gas G generated in the rotary kiln 10, guides it from the first guide section 32 through the second guide section 33 to the recovery device 60, and the recovery device 60 recovers the zinc-containing components from the treatment gas G. As a result of repeating this process, the zinc-containing components contained in the vaporized treatment gas G adhere to the inner surface of the inner pipe 35 as a deposit h, and if this deposit h accumulates on the inner surface of the inner pipe 35, as shown in Figure 2, the lid 37 provided on the outlet 36 at the end of the first guide section 32 is removed to open the outlet 36, and in this state, the inner pipe 35 is moved toward the outlet 36 and the inner pipe 35 is taken out from the outlet 36 to the outside.

[0030] Then, by cleaning the inner pipe 35 removed from the removal port 36 in this way, it becomes possible to easily remove deposits h adhering to the inner surface of the inner pipe 35. Meanwhile, although not shown, a new inner pipe 35 is inserted into the first guide part 32 from the removal port 36 and moved to a predetermined position, and the removal port 36 is closed with the lid member 37.

[0031] In this way, the inner circumferential pipe 35 having deposits h on its inner circumferential surface can be easily replaced with a new inner circumferential pipe 35.

[0032] Here, even when the lid material 37 is removed and the outlet 36 is opened as described above, the treated gas G containing zinc vaporized in the rotary kiln 10 is sucked into the suction pipe 30 through the suction port 31 of the suction pipe 30 by the suction device, and the treated gas G is guided through the first guide section 32 and the second guide section 33 in the suction pipe 30 to the recovery device 60 provided outside the rotary kiln 10, thereby preventing the treated gas G from leaking from the outlet 36.

[0033] In order to prevent the inner circumferential tube 35 from corroding due to the deposits h, the inner circumferential tube 35 may be made of ceramic.

[0034] In addition, in the dust treatment equipment according to this embodiment, various moving means can be used to move the inner circumferential pipe 35 to the inner periphery of the first guide portion 32 of the suction pipe 30 in the axial direction X of the rotary kiln 10.

[0035] 3(A) and 3(B), an operating rod 41 attached to a moving member 40 is introduced into the first guide section 32 of the suction pipe 30 through a hole 38 provided in the lid member 37, while a moving member mounting plate 42 having a plurality of ventilation holes 42a is attached to the tip of the operating rod 41. This moving member mounting plate 42 is attached to the end of the discharge side of the inner circumferential pipe 35, and the operating rod 41 attached to the moving member 40 is moved in the axial direction X of the rotary kiln 10, thereby moving the inner circumferential pipe 35 in the axial direction X of the rotary kiln 10. A sealing mechanism (not shown) may be provided in the hole 38 to prevent the treatment gas G from leaking to the outside.

[0036] In addition, in the dust treatment equipment according to this embodiment, when removing the deposits h adhering to the inner surface of the inner pipe 35 from the inner surface of the inner pipe 35, for example, as shown in FIG. 4, the inner pipe 35 is moved to a position away from the suction port 31 within the first guide section 32 of the suction pipe 30, and a gas ejection pipe 51 is attached to the first guide section 32 of the suction pipe 30 between the tip of the inner pipe 35 thus moved and the suction port 31, and a valve 52 provided on the gas ejection pipe 51 is opened to blow the cleaning gas F from the gas ejection pipe 51 into the first guide section 32.

[0037] In this way, when the cleaning gas F is blown into the first guide section 32 from the gas ejection pipe 51, the cleaning gas F is guided into the inner circumferential pipe 35, and the deposits h adhering to the inner surface of the inner circumferential pipe 35 are removed by the cleaning gas F. The removed deposits h are then guided from the first guide section 32 through the inlet 34 to the second guide section 33 and collected in the collection device 60.

[0038] Furthermore, in the dust treatment equipment according to this embodiment, as shown in FIG. 5, the first guide section 32 in the suction pipe 30 may be provided with an extension section 32a that extends further on the side opposite the suction port 31 than the inlet 34 that connects to the second guide section 33, and the inner pipe 35 may be moved into the extension section 32a.

[0039] Thereafter, the lid 37 attached to the outlet 36 at the end of the extension 32a is removed, the inner tube 35 is taken out through the outlet 36, and any deposits h adhering to the inner surface of the inner tube 35 are removed, while a new inner tube 35 is inserted into the extension 32a through the outlet 36, the outlet 36 is closed with the lid 37, and the new inner tube 35 is moved to a predetermined position.

[0040] In this way, the distance from the inlet 34 to the outlet 36 is lengthened and the resistance of the flow path is increased, so that when the zinc-containing treatment gas G generated in the rotary kiln 10 is sucked into the suction pipe 30 by the suction device (not shown) and guided to the recovery device 60 provided outside the rotary kiln 10 through the first guide section 32 and the second guide section 33 of the suction pipe 30, the treatment gas G is further prevented from leaking when guided to the outlet 36. Furthermore, although not shown, a shutter member (not shown) can be provided between the inlet 34 and the extension section 32a to reliably prevent the treatment gas G from being guided to the outlet 36. [Explanation of symbols]

[0041] 10: Rotary kiln 11: Material introduction section 12:Heating device 13: Outlet 14: Residue collection section 20: Dust supply device 30: Suction tube 31: Suction port 32: 1st information section 32a: Extension part 33:Second information section 34: Entrance 35: Inner tube 36: Removal port 37: Lid material 38: Hole 40: Moving parts 41: Operating rod (operating rod) 42: Moving parts mounting plate 42a: Ventilation hole 51: Gas ejection pipe 52: Valve 60: Recovery device C: Coke D: Dust F: Cleaning gas G: Processing gas X: Axial direction h: adhesion

Claims

1. This dust treatment equipment introduces zinc-containing dust into a rotating rotary kiln through an inlet on one side thereof and heats it, and then moves it to the discharge side on the other side of the rotary kiln while vaporizing the zinc-containing components contained in the dust. At the same time, a suction pipe is inserted into the rotary kiln from the discharge side of the rotary kiln, and the vaporized treatment gas is guided through the suction port of the suction pipe to a recovery device provided outside the rotary kiln, and the zinc-containing components are recovered from the vaporized treatment gas by the recovery device. This dust treatment equipment is characterized in that an inner pipe is provided on the inner periphery of a first guide portion of the suction pipe, which extends from the suction port to the outside of the rotary kiln along the axial direction of the rotary kiln, so as to be movable in the axial direction of the rotary kiln, and the length of the inner pipe protruding from the suction port of the suction pipe to the introduction side is adjusted.

2. 2. The dust treatment equipment according to claim 1, wherein an outlet for removing the inner circumferential tube from the first guide section and a lid for opening and closing the outlet are provided at the end of the first guide section opposite the suction port of the suction pipe.

3. 2. The dust treatment facility according to claim 1, further comprising a moving means for moving an inner peripheral pipe provided on the inner periphery of said first guide portion in the axial direction of the rotary kiln.

4. The moving means described in claim 3 is a dust processing equipment characterized in that an operating rod is inserted into the first guide part from the end of the first guide part opposite the suction port of the suction pipe, the tip of the operating rod is attached to the inner tube, and the operating rod protruding from the end of the first guide part is slid from the outside in the axial direction of the rotary kiln to move the inner tube in the axial direction of the rotary kiln.

5. 2. The dust treatment equipment according to claim 1, further comprising a cleaning means for blowing cleaning gas into the first guide section on the suction port side of the inner pipe while the inner pipe is moved closer to the discharge side of the rotary kiln than the suction port of the suction pipe, thereby cleaning off deposits adhering to the inner pipe.

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