JP2019011924A - Rotary kiln equipment - Google Patents

Abstract

To provide rotary kiln equipment capable of preventing the reservoir of raw material powder in a space between a seal member and a seal face.SOLUTION: Rotary kiln equipment 1 comprises: a cylindrical retort 11, by being rotated, treating raw material powder 400 fed to the primary side and moving the same to the secondary side; a feed device 12 covering the primary side of the retort 11 and feeding the raw material powder 400 to the retort 11; an exhaust device 13 covering the secondary side of the retort 11 and exhausting the raw material powder 400 treated in the retort 11 to the secondary side; and a seal structure 14 having a pair of mirror image-shaped seal members 44 and 45 provided between the feed device 12 and the retort 11 and between the retort 11 and the exhaust device 13, respectively, and provided at the outer circumferential face of the retort 11 and seal plates 42 provided at the feed device 12 and the exhaust device 13, respectively, arranged between the pair of seal members 44 and 45, and further, against which the pair of seal members 44 and 45 are slid at both the main faces.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotary kiln facility for processing raw material powder.

  Conventionally, rotary kilns such as a rotary kiln that heats raw material powder to perform drying treatment and firing processing and a rotary cooler that cools raw material powder have been known as equipment for processing powdery raw material powder (for example, , See Patent Document 1). In addition, as a rotary kiln facility, a combination of a plurality of rotary kilns and rotary coolers is also known in order to continuously process the drying, firing and cooling of raw material powder.

  The rotary kiln facility includes a retort called a core tube that contains and rotates raw material powder to be processed, and a heater that heats the retort. The rotary kiln equipment includes an annular seal member that hermetically seals the inside and outside of the retort by tightly attaching a lip to a flange having a seal surface orthogonal to the rotation center of the retort. The seal member prevents the raw material powder from leaking to the outside and prevents foreign matter from entering the retort. Moreover, in order to make a lip contact | adhere to a sealing surface, the rotary kiln installation is reducing the pressure of the internal space of a retort from atmospheric pressure.

JP 2003-307388 A

  The above-described rotary kiln facility has the following problems. That is, the lip of the seal member extends in an inclined manner with respect to the seal surface of the flange, thereby being in close contact with the seal surface, and the retort is arranged with the rotation center along the horizontal direction. For this reason, a frustoconical space is formed between the lip and the seal surface, but the raw material powder enters the lower part of the space and the raw material powder accumulates. However, when a certain amount of raw material powder accumulates in the lower part of the space, there is a possibility that the raw material powder will push the lip and leak to the outside. Further, when the accumulated raw material powder is positioned between the sealing surface and the lip and the retort rotates, the lip is worn, and the life of the sealing member may be reduced.

  Further, in the rotary kiln equipment, the pressure in the internal space of the retort has to be reduced from the atmospheric pressure in order to bring the lip of the seal member into close contact with the seal surface. For this reason, raw material powder was able to be processed only in an environment lower than atmospheric pressure. For this reason, there has been a demand for a rotary kiln that can seal the sealing member regardless of whether the pressure in the retort is negative or positive.

  Accordingly, an object of the present invention is to provide a rotary kiln facility that can prevent raw powder from accumulating in a space between a seal member and a seal surface and can seal regardless of the pressure in the retort.

  According to one aspect of the present invention, the rotary kiln equipment covers the primary side of the retort, a cylindrical retort that processes the raw material powder supplied to the primary side by rotating and moves it to the secondary side, A supply device for supplying the raw material powder to the retort, a discharge device for covering the secondary side of the retort and discharging the raw material powder processed by the retort to the secondary side, and between the supply device and the retort And a pair of mirror image-shaped seal members provided between the retort and the discharge device, respectively, and provided on the supply device and the discharge device, respectively. And a seal structure having a seal plate disposed between the seal members and having seal surfaces on both main surfaces on which the pair of seal members slide.

  The present invention can provide a rotary kiln facility that can prevent raw powder from accumulating in a space between a seal member and a seal surface.

Sectional drawing which shows the structure of the rotary kiln installation which concerns on one Embodiment of this invention. Sectional drawing which shows the structure of the primary side of the rotary kiln installation from a part side surface. Sectional drawing which shows the structure of the seal structure provided in the primary side of the rotary kiln installation. Sectional drawing which shows the structure of the secondary side of the rotary kiln installation. Sectional drawing which shows the structure of the seal structure provided in the secondary side of the rotary kiln installation. Sectional drawing which shows the structure of the testing apparatus which performed the evaluation test of the rotary kiln installation. Explanatory drawing which shows the result of the same evaluation test.

Hereinafter, the structure of the rotary kiln equipment 1 which concerns on one Embodiment of this invention is demonstrated using FIG. 1 thru | or FIG.
FIG. 1 is a cross-sectional view schematically showing a configuration of a rotary kiln 1 that is a rotary kiln facility according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a configuration of a primary side of the rotary kiln 1 from a part of the side, and FIG. 3 is an enlarged cross-sectional view showing a configuration of a seal structure 14 provided on the primary side of the rotary kiln 1. 4 is a cross-sectional view showing the configuration of the secondary side of the rotary kiln 1, and FIG. 5 is an enlarged cross-sectional view of the configuration of the seal structure 14 provided on the secondary side of the rotary kiln 1. As shown in FIG. In addition, in this embodiment, the side which supplies the raw material powder 400 processed with the rotary kiln 1 is made into a primary side, and the side which discharges the raw material powder 400 processed with the rotary kiln 1 is made into a secondary side below, and is demonstrated.

  The rotary kiln facility 1 is used for facilities for processing the raw material powder 400. The rotary kiln facility 1 is a rotary kiln that heats the raw material powder 400 to perform a drying process or a baking process, a rotary cooler that cools the raw material powder 400, or the like. In the present embodiment, the rotary kiln 1 will be described below as the rotary kiln facility 1. Here, the raw material powder 400 is a powdery material, for example, a water-containing powder or an unfired powder, and is dehydrated, dried, or fired by the rotary kiln 1. As an example, the raw material powder 400 is a lithium hydroxide anhydride.

  As shown in FIG. 1, the rotary kiln 1 includes a base 10, a retort 11, a supply device 12, a discharge device 13, a seal structure 14, and a heating device 15. Further, the rotary kiln 1 has a drive source for rotating the retort 11.

  The base 10 is configured in a rectangular plate shape whose upper surface is configured as a plane. The base 10 is fixed to the floor of a factory where the rotary kiln 1 is installed.

  The retort 11 rotates to convey the raw material powder 400 accommodated therein from the primary side to the secondary side and process the raw material powder 400 accommodated in the conveyance process. As shown in FIGS. 2 and 4, the retort 11 is called, for example, a furnace core tube, and together with the supply device 12, the discharge device 13, and the seal structure 14, the retort 11 is made of the raw material powder 400 blocked from the external space 200 of the rotary kiln 1. An internal space 100 for processing is configured. Here, the external space 200 is a space in the factory where the rotary kiln 1 is installed.

  The retort 11 is configured in a cylindrical shape, and is rotatably supported on the base 10 by a support member 10a or the like such that its axis is slightly inclined downward from the primary side to the secondary side. The retort 11 has a plurality of lifting plates extending in the axial direction on the inner peripheral surface.

  The supply device 12 is fixed on the base 10. The supply device 12 is provided on the primary side of the retort 11. The supply device 12 is configured to be able to supply the raw material powder 400 to the primary side of the retort 11. As shown in FIG. 2, the supply device 12 includes, for example, a first hood 21 that covers an open end on the primary side of the retort 11, and a supply feeder 22 that is provided in the first hood 21 and supplies the raw material powder 400. , And an exhaust pipe 23 for exhausting the gas that has passed through the retort 11.

  The inner diameter of the first hood 21 is configured to be larger than the outer diameter of the retort 11. The first hood 21 is fixed on the base 10 with a predetermined gap between the inner peripheral surface and the outer peripheral surface of the retort 11.

  The discharge device 13 is fixed on the base 10. The discharge device 13 discharges the processed raw material powder 400 to the secondary side of the retort 11, and collects the discharged raw material powder 400, for example. As shown in FIG. 4, for example, the discharging device 13 is provided in the bottomed cylindrical second hood 31 that covers the open end on the secondary side of the retort 11, and the second hood 31, and the raw powder 400 A discharge pipe 32 provided on the secondary side, a supply pipe 33 that supplies gas into the retort 11, and a collection device 34 that is connected to the discharge pipe 32 and collects the processed raw material powder 400 are provided.

  The inner diameter of the second hood 31 is configured to be larger than the outer diameter of the retort 11. The second hood 31 is fixed on the base 10 with an inner circumferential surface leaving a predetermined gap from the outer circumferential surface of the retort 11.

  As shown in FIGS. 2 to 5, the seal structure 14 is provided between the retort 11 and the supply device 12 and between the retort 11 and the discharge device 13. The two seal structures 14 hermetically seal between the internal space 100 and the external space 200 of the retort 11.

  Specifically, as shown in FIGS. 5 and 6, the seal structure 14 includes a first support member 41, a seal plate 42, a second support member 43, a first seal member 44, and a second seal member. 45.

  The first support member 41 is provided on the first hood 21 or the second hood 31. That is, one first support member 41 of the two seal structures 14 is fixed to the opening of the first hood 21, and the other first support member 41 of the two seal structures 14 is an opening of the second hood 31. Fixed to.

  The first support member 41 fixed to the first hood 21 fixes the seal plate 42. The first support member 41 fixed to the first hood 21 is airtightly fixed between the first hood 21 and between the first support member 41 and the seal plate 42.

  The first support member 41 fixed to the second hood 31 fixes the seal plate 42. The first support member 41 fixed to the second hood 31 is airtightly fixed between the second hood 31 and between the first support member 41 and the seal plate 42.

  The seal plate 42 is configured in an annular plate shape. Both main surfaces of the seal plate 42 are in contact with the first seal member 44 and the second seal member 45, respectively, and constitute a seal surface on which the first seal member 44 and the second seal member 45 slide. The seal plate 42 is supported by the first hood 21 or the second hood 31 via the first support member 41 in a posture in which the surface directions of both main surfaces are orthogonal to the rotation center of the retort 11. The

  The second support member 43 is configured in a cylindrical shape and is provided on the outer peripheral surface of the end portion of the retort 11. That is, the second support members 43 of the two seal structures 14 are respectively fixed to the outer peripheral surfaces of both end portions of the retort 11 so as to be rotatable with the rotation of the retort 11. The second support member 43 fixes the first seal member 44 and the second seal member 45 to the outer peripheral surface. The second support member 43 is disposed at a position where the axial intermediate portion faces the seal plate 42. The outer diameter of the second support member 43 is configured to be smaller than the inner diameter of the seal plate 42. The second support member 43 is airtightly fixed directly on the outer peripheral surface of the retort 11 or on an annular rib provided on the outer peripheral surface of the retort 11.

  The first seal member 44 is formed in an annular shape and is made of a resin material or the like. The first seal member 44 is airtightly fixed to the outer peripheral surface of the second support member 43. The first seal member 44 includes an annular base 44a fixed to the second support member 43, and an annular lip which is one main surface of the base 44a and is integrally provided at the end on the axial center side. 44b.

  The lip 44b projects in an oblique direction outward in the radial direction from the axial end of the base portion 44a. The tip of the lip 44 b comes into contact with the seal surface of the seal plate 42 when the first seal member 44 is fixed to the second support member 43.

  The second seal member 45 is formed in an annular shape and is made of a resin material or the like. The second seal member 45 is airtightly fixed to the outer peripheral surface of the second support member 43. The second seal member 45 includes an annular base portion 45a fixed to the second support member 43, and an annular lip 45b provided integrally on one main surface on the axial center side of the base portion 45a.

  The lip 45b protrudes obliquely outward in the radial direction from the end on the axial center side of the base portion 44a. The tip of the lip 45 b comes into contact with the seal surface of the seal plate 42 when the second seal member 45 is fixed to the second support member 43. The lip 45b is fixed to the second support member 43, and when the first seal member 44 and the second seal member 45 face each other, the side facing the lip 44b provided on the base portion 44a of the first seal member 44. Is provided on the main surface of the base portion 45a.

  In other words, the first seal member 44 and the second seal member 45 are fixed to the second support member 43 and have different main surfaces on which the lips 44b and 45b of the base portions 44a and 45a are provided. In other words, the first seal member 44 and the second seal member 45 are configured in a mirror image shape.

  The seal structure 14 having such a configuration is such that the first seal member 44 and the second seal member 45 are in contact with the seal surfaces of both main surfaces of the seal plate 42, respectively, so that the retort 11, the first hood 21, and the second hood The internal space 100 for processing the raw material powder 400 composed of 31 is cut off from the external space 200. In the seal structure 14, the first seal member 44 is disposed on the inner space 100 side, and the second seal member 45 is disposed on the outer space 200 side.

  The heating device 15 is provided around the retort 11 and heats the retort 11 to heat the internal space 100 in which the raw material powder 400 is processed.

  In the rotary kiln 1 configured as described above, the pair of the first seal member 44 and the second seal member 45 of the seal structure 14 are mirror images, and the lip 44b of the first seal member 44 and the lip 45b of the second seal member 45 are formed. Are brought into contact with the seal surfaces of both main surfaces of the seal plate 42, respectively. The seal structure 14 having such a configuration blocks the internal space 100 of the rotary kiln 1 where the raw material powder 400 is processed and the external space 200 of the rotary kiln 1.

  For example, when the internal space 100 is set to a pressure lower than the atmospheric pressure of the external space 200, the internal space 100 in which the raw material powder 400 composed of the retort 11, the first hood 21, and the second hood 31 is processed, and The space 110 between the first seal member 44 and the second seal member 45 has a negative pressure. As a result, the lip 44b of the first seal member 44 abuts against the seal surface of the seal plate 42 by its own elastic force, and the lip 45b of the second seal member 45 abuts by the external pressure.

  Further, when the internal space 100 is set to a pressure higher than the atmospheric pressure of the external space 200, the internal space 100 in which the raw powder 400 composed of the retort 11, the first hood 21, and the second hood 31 is processed, and the first A space 110 between the first seal member 44 and the second seal member 45 has a positive pressure. Thereby, the lip 45b of the second seal member 45 abuts on the seal surface of the seal plate 42 by its own elastic force, and the lip 44b of the first seal member 44 abuts by the internal pressure of the internal space 100.

  As a result, the rotary kiln 1 can reliably block the internal space 100 in which the raw material powder 400 composed of the retort 11, the first hood 21, and the second hood 31 is processed from the external space 200 and seal it airtight. It becomes possible. Thereby, it can prevent that a foreign material mixes into the internal space 100 which processes the raw material powder 400 from the outside, and can prevent that the raw material powder 400 leaks from the internal space 100 to the external space 200 side.

  Further, in the seal structure 14, the shapes of the first seal member 44 and the second seal member 45 are mirror images, and the lip 44 b of the first seal member 44 and the lip 45 b of the second seal member 45 are both main surfaces of the seal plate 42. It is the structure which contacts. For this reason, when the raw material powder 400 is processed, the raw material powder 400 that has moved to the seal structure 14 does not accumulate in the space between the lip 44 b and the seal surface of the seal plate 42.

  More specifically, by configuring the seal structure 14 as described above, the first seal member 44 located on the inner space 100 side has the main surface on the side facing the base portion 44a of the lip 44b disposed on the inner space 100 side. Is done.

  For this reason, even if the raw material powder 400 moves to the upper surface side of the 1st sealing member 44, the 1st sealing member 44 moves to the space between the base 44a and the lip 44b. And since the 1st seal member 44 also rotates with rotation of the retort 11, the raw material powder 400 adhering to the 1st seal member 44 is spaced apart from the 1st seal member 44 at the time of rotation of the retort 11, and falls. Thus, since the raw material powder 400 does not move to the space between the lip 44b and the sealing surface, but moves to the base 44a and the lip 44b and falls, it accumulates between the base 44a and the lip 44b. There is no. In addition, since the seal structure 14 is configured to drop the raw material powder 400, the raw material powder 400 can be prevented from entering between the lip 44 b and the sealing surface of the seal plate 42.

  Further, even if the raw material powder 400 accumulates in the space between the base portion 44a and the lip 44b for some reason, the accumulated raw material powder 400 presses the lip 44b toward the sealing surface, in other words, the first seal member. The lip 44b is pressed in the direction in which the sealing performance of 44 is improved.

  For this reason, since the seal structure 14 can reliably prevent the raw material powder 400 from leaking from the internal space 100 to the outside, the raw material powder 400 moves to the space 110 between the first seal member 44 and the second seal member 45. As a result, the raw material powder 400 can be prevented from accumulating in the space between the sealing surface of the sealing plate 42 and the lip 44b.

  Further, since the raw material powder 400 can be prevented from entering between the lip 44b and the seal surface, the lip 44b slides on the seal surface with the raw material powder 400 interposed between the lip 44b and the seal surface. Can be prevented. As a result, since the wear of the lip 44b can be suppressed, it is possible to prevent the life of the first seal member 44 from being reduced.

  Moreover, the rotary kiln 1 is made into the seal structure 14 which has the 1st seal member 44 and the 2nd seal member 45, The raw material powder 400 comprised by the retort 11, the 1st hood 21, and the 2nd hood 31 is processed. The pressure in the internal space 100 may be negative or positive with respect to the external space 200. That is, according to the conventional seal structure using only one seal member, the internal space 100 needs to be negative with respect to the external space 200 in order to ensure the airtightness of the seal structure. According to 1, the pressure in the internal space 100 can be set as appropriate. As a result, the rotary kiln 1 has a high degree of freedom with respect to the internal pressure.

  For this reason, the rotary kiln 1 can arbitrarily set the pressure of the internal space 100 to the processing conditions of the raw material powder 400, and also against internal pressure fluctuations during backwashing of a filter used on the secondary side of the rotary kiln 1. External leakage from the seal structure 14 can be prevented.

Next, the evaluation test and test results of such a rotary kiln facility 1 will be described with reference to FIGS.
As an evaluation test of the rotary kiln facility 1, the raw material powder before processing is fed into a space located on the inner space 100 side of the retort 11 of the first seal member 44 of the seal structure 14 using a test apparatus 300 shown in FIG. 6. And the test apparatus 300 is driven. Further, as a comparative example, the configuration 310 having only the second seal member 45 is provided in the test apparatus 300 as in the conventional rotary kiln facility 1, and similarly, the space located on the internal space 100 side of the retort 11 of the configuration 310. The raw material powder 400 was put in and the test apparatus 300 was similarly driven. In addition, the raw material powder 400 to be used is first tested with the raw material powder 400 before the treatment, and after the test has passed for 50 hours, the raw material powder 400 before the treatment is removed, how the raw material powder 400 after the treatment is filled in the space, Similarly, the test apparatus 300 was driven. In addition, after the test apparatus 300 was driven, the weight of the raw material powder 400 leaked from the first seal member 44 and the second seal member 45 was measured periodically to determine the cumulative leak amount (g).

  As shown in FIG. 6, the test apparatus 300 used for the evaluation test includes a pseudo retort 301, a drive mechanism 302 that rotates the pseudo retort 301, a seal structure 14 provided on the outer peripheral surface of the pseudo retort 301, and a comparative example. A configuration 310.

  The seal structure 14 provided in the pseudo-retort 301 is configured such that the first seal member 44 and the second seal member 45 are provided with the seal plates 42, respectively.

  The result of the evaluation test is shown in FIG. As shown by the one-dot chain line in FIG. 7, in the configuration 310 provided with only the second seal member 45 of the comparative example, a large amount of raw material powder 400 could be confirmed in 50 hours from the start of the test. Moreover, when 50 hours passed from the start of the test, the raw material powder 400 was replaced with a raw material powder after the treatment, but the amount of leakage of the raw material powder 400 was increased by using the raw material powder 400 after the treatment.

  On the other hand, in the case of the seal structure 14 corresponding to the present embodiment, in FIG. 7, the first seal member 44 is indicated by a broken line and a triangular mark, and the second seal member 45 is indicated by a solid line. As shown in FIG. 7, the seal structure 14 has almost no leakage in both the first seal member 44 and the second seal member 45, and the first seal member 44 has 0.03 g of the first seal member after 400 hours. In the 2 seal member 45, since the raw material powder 400 has hardly leaked in the 1st seal member 44, it was 0g. Moreover, when 50 hours passed from the start of the test, the raw material powder 400 was changed from the pre-treatment to the post-treatment, but almost no leakage occurred.

  From such an evaluation test, the rotary kiln facility 1 having the seal structure 14 of the present embodiment can prevent the raw material powder 400 from leaking and can prevent the first seal member 44 and the second seal member 45 from deteriorating in life. Became clear.

  As described above, according to the rotary kiln 1 according to the embodiment of the present invention, each lip 44b, 45b of the pair of first seal member 44 and second seal member 45 on both main surfaces of one seal plate 42 is provided. It is set as the structure which contacts. Thereby, the rotary kiln 1 has high airtightness, prevents foreign matter from entering from the outside, and can prevent the raw material powder 400 from accumulating in the space between the seal surfaces of the seal plate 42.

  The present invention is not limited to the above embodiment. For example, although the above-described configuration has been described using the rotary kiln 1 as the rotary kiln facility 1 including the seal structure 14, the configuration is not limited thereto. In other words, the rotary kiln facility 1 rotates to accommodate and process the raw material powder 400 therein, and to transfer members such as the retort 11 that convey the stored raw material powder 400 from the primary side to the secondary side. , 31 so long as the outer space 200 and the inner space 100 to be processed are blocked by the seal structure 14, it can be used for other similar equipment. That is, for example, the rotary kiln facility 1 may be a rotary cooler that does not have the heating device 15.

  That is, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the embodiments may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the present invention includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and an effect can be obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 1 ... Rotary kiln equipment (rotary kiln), 10 ... Base, 10a ... Supporting member, 11 ... Retort, 12 ... Feeding device, 13 ... Discharge device, 14 ... Seal structure, 15 ... Heating device, 21 ... 1st hood, 22 DESCRIPTION OF SYMBOLS Supply feeder, 23 ... Exhaust pipe, 31 ... Second hood, 32 ... Discharge pipe, 33 ... Supply pipe, 41 ... First support member, 42 ... Seal plate, 43 ... Second support member, 44 ... First seal member 44a ... base, 44b ... lip, 45 ... second seal member, 45a ... base, 45b ... lip, 100 ... inner space, 200 ... outer space, 300 ... test device, 301 ... pseudo-retort, 302 ... drive mechanism, 310 ... Composition, 400 ... Raw material powder.

Claims (3)

A cylindrical retort that processes the raw material powder supplied to the primary side by rotating and moves it to the secondary side,
A supply device that covers a primary side of the retort and supplies the raw powder to the retort;
A discharge device that covers the secondary side of the retort and discharges the raw material powder treated with the retort to the secondary side;
A pair of mirror image-shaped seal members provided between the supply device and the retort, and between the retort and the discharge device, and provided on the outer peripheral surface of the retort, and the supply device and the discharge device And a seal structure that is disposed between the pair of seal members and has a seal plate on both main surfaces on which the pair of seal members slide.
Rotary kiln equipment with. The seal structure has a support member that is fixed to the outer peripheral surface of the retort and fixes the pair of seal members;
2. The rotary according to claim 1, wherein the seal member includes a base portion fixed to the support member, and a lip that is provided on the base portion and that is slidable on the seal surface and is inclined radially outward. Kiln facilities. The supply device includes a first hood that covers one end of the retort and has an inner diameter larger than an outer diameter of the retort,
The discharge device covers the other end of the retort, and has a second hood whose inner diameter is larger than the outer diameter of the retort,
The rotary kiln facility according to claim 2, wherein the seal plate is provided in each of the first hood and the second hood.