Rotary kiln

Abstract

The cylindrical sealing members, which are sequentially arranged in stages along the axial direction of the kiln body, can be connected without difficult work, thereby achieving excellent sealing performance. [Solution] The kiln comprises a kiln body 1 and a fixing part 2, and the space between the kiln body 1 and the fixing part 2 is sequentially sealed in stages by a first sealing part 10 and a second sealing part 20. The first sealing part 10 is configured to include a first cylindrical body 11 provided at a distance from the outer circumference of the kiln body 1 as a member of the fixing part 2, and a gland packing 12 interposed between the first cylindrical body 11 and the kiln body 1. The second sealing part 20 is configured to include a second cylindrical body 21 arranged in series with respect to the first cylindrical body 11 in the axial direction of the kiln body 1 as a member of the fixing part 2, and a lip packing 22 interposed between the second cylindrical body 21 and the kiln body 1. The first cylindrical body 10 and the second cylindrical body 20 are connected via an expansion joint 30 that expands and contracts in the axial direction of the kiln body 1 and is flexible in the radial direction.

Description

【Technical Field】 【0001】 This invention relates to a rotary kiln for heat-treating supplied raw materials. 【Background Art】 【0002】 A rotary kiln is a device that heat-treats supplied raw materials and takes them out as solids. As shown in FIG. 3, a kiln body 51 that transfers raw materials while rotating is installed above a gantry 50. Entrance-side fixed hoods 52a and exit-side fixed hoods 53a are provided at fixed parts 52 and 53 at both ends of the kiln body 51, respectively, and an external heating device 54 is provided so as to cover the outer periphery of the kiln body 51. 【0003】 In this rotary kiln, annular tire parts 55, 55 are provided on the outer peripheral surfaces on both end sides of the kiln body 51, and the kiln body 51 is rotatably supported by two rollers 56, 56 that are brought into contact with the lower sides of the respective tire parts 55. Further, this rotary kiln can rotate the kiln body 51 by driving a sprocket 57 provided on the outer peripheral surface of the kiln body 51 with a motor (not shown). 【0004】 In such a rotary kiln, raw materials are supplied to the kiln body 51 that has been heated to a high temperature by the external heating device 54 and transferred to the exit-side fixed hood 53a of the fixed part 53, and reaction gas is supplied to the kiln body 51 through the exit-side fixed hood 53a. At this time, the generated solids are discharged through the exit-side fixed hood 53a, and the generated gas and unreacted gas are discharged through the entrance-side fixed hood 52a. 【0005】 Further, the rotary kiln is provided with a seal part 58 at the connection parts between the kiln body 51 and the fixed parts 52, 53 in order to prevent the generated gas and unreacted gas from leaking to the outside. 【0006】 As a sealing portion 58, Patent Document 1 discloses a configuration in which a gland packing and a lip packing are arranged sequentially in steps along the axial direction of the kiln body 51. The gland packing contacts cylindrical members on the rotating side and the stationary side provided on the outer circumference of the kiln body 51, while the lip packing is attached to a lip packing retainer, which is a cylindrical member on the stationary side, and contacts the cylindrical member on the rotating side. [Prior art documents] [Patent Documents] 【0007】 [Patent Document 1] Japanese Patent Publication No. 2010-236800 [Overview of the Initiative] [Problems that the invention aims to solve] 【0008】 However, in the rotary kiln described above, the cylindrical member on the fixed side that the gland packing contacts and the lip packing retainer to which the lip packing is attached are mechanically connected by bolts, which presents a problem in that it is difficult to align these parts individually. 【0009】 Furthermore, if the kiln body 51 is installed at an angle, adjusting these heights becomes difficult, and centering becomes extremely challenging. 【0010】 Furthermore, because a simple disc with a circular hole punched out is used as the lip packing, installation defects frequently occur where the lip packing does not flex in the intended direction relative to the contact surface during installation, but instead flips inside out, resulting in unstable sealing performance. 【0011】 Therefore, the object of this invention is to provide a rotary kiln that can achieve excellent sealing performance by connecting cylindrical members of the sealing section, which are sequentially arranged in stages along the axial direction of the kiln body, without requiring difficult work. [Means for solving the problem] 【0012】 To solve the above problems, this invention provides a kiln body that transfers raw materials while rotating, and a fixing part located at its end, wherein the space between the kiln body and the fixing part is sequentially sealed in stages by a first sealing part and a second sealing part. The first sealing portion comprises a first cylindrical body provided at intervals on the outer circumference of the kiln body as a member of the fixing portion, and a gland packing interposed between the first cylindrical body and the kiln body. The second sealing portion comprises a second cylindrical body arranged in series with respect to the first cylindrical body in the axial direction of the kiln body as a member of the fixing portion, and a lip packing interposed between the second cylindrical body and the kiln body. The invention provides a rotary kiln in which the first cylindrical body and the second cylindrical body are connected via an expansion joint that expands and contracts in the axial direction of the kiln body and is flexible in the radial direction (Configuration 1). 【0013】 Furthermore, in the rotary kiln of configuration 1, multiple gland packings are provided in the axial direction of the kiln body, and the gland packings at both ends are of higher hardness than the gland packing in the middle (configuration 2). 【0014】 Furthermore, in the rotary kiln of configuration 2, the gland packing at both ends in the axial direction of the kiln body contains carbon fiber, while the gland packing in the middle contains aramid fiber (configuration 3). 【0015】 Furthermore, in the rotary kiln described in any of configurations 1 to 3, the lip packing used is one that has been pre-formed to bend at an intermediate portion between the attachment portion to the second cylinder and the contact portion to the kiln body (configuration 4). 【0016】 Furthermore, in the rotary kiln of configuration 4, a mounting adapter that conforms to the bent shape of the lip packing formed by molding was used to attach the lip packing to the second cylindrical body (configuration 5). 【Advantages of the Invention】 【0017】 In the rotary kiln according to this invention, even if the heights of the first cylinder of the first seal part and the second cylinder of the second seal part are slightly different in the assembly process, by appropriately expanding and contracting and bending the expansion and contraction pipe, the axial centers of the first cylinder and the second cylinder can be separately finely adjusted without being affected by the other, so as to absorb the deviation of the axial center with respect to the axis of the kiln body. Therefore, excellent sealing performance can be easily obtained. 【0018】 Also, by changing the hardness of the gland packing at both ends and the middle part in the axial direction of the kiln body, and using the gland packing at both ends containing carbon fiber or the like, the hardness is made higher than that of the gland packing in the middle part containing aramid fiber or the like. Therefore, the sealing performance of the first seal part is maintained for a long time. 【0019】 Furthermore, since the lip packing is preformed into a bent shape, it is possible to prevent the phenomenon that the lip packing is turned inside out when it is attached to the second cylinder of the second seal part or during the operation of the rotary kiln, and the desired sealing performance of the second seal part can be obtained. 【0020】 Also, since the preformed lip packing is attached to the second cylinder using a mounting adapter along its bent shape, the attachment of the lip packing to the second seal part becomes easy, the occurrence of attachment defects is prevented, the lip packing can be surely prevented from turning inside out, and a reduction in claims due to leakage of powder and gas from inside the kiln is expected. [[ID=二十]]【Brief Description of the Drawings】 【0021】 [Figure 1] Partial enlarged cross-sectional view showing the vicinity of the first seal part and the second seal part of the rotary kiln according to this invention [Figure 2] Perspective view showing the appearance of the first seal part and the second seal part as described above [Figure 3] Overall front view of the rotary kiln described in Patent Document 1 【Best Mode for Carrying Out the Invention】 【0022】 Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. 【0023】 This rotary kiln has the same overall basic configuration as that shown in FIG. 3, but the configuration of the seal part is different from that shown in FIG. 3. 【0024】 As shown in FIGS. 1 and 2, this rotary kiln has a first seal part 10 and a second seal part 20 as a seal part for sealing between the kiln body 1 and the member of the fixed part 2 located on the end part side. The first seal part 10 and the second seal part 20 are sequentially arranged in the axial direction of the kiln body 1 from the hood 2a side of the fixed part 2, supported by the support frame 3 on the gantry, and the height is adjusted by the shim plate 3a. 【0025】 The inside 1a of the kiln of the kiln body 1 and the fixed part 2 communicate with each other, and a seal base 1b is provided on the outer peripheral side of the kiln body 1. And the first seal part 10 and the second seal part 20 are configured such that the member on the fixed part 2 side surrounds the outer peripheral surface of the seal base 1b. 【0026】 The member on the fixed part 2 side of the first seal part 10 is a first cylindrical body 11 provided at an interval from the outer periphery of the seal base 1b of the kiln body 1, and the member on the fixed part 2 side of the second seal part 20 is a second cylindrical body 21 arranged in series in the axial direction of the kiln body 1 with respect to the first cylindrical body 11 at an interval from the outer periphery of the seal base 1b of the kiln body 1. 【0027】 The first cylindrical body 11 and the second cylindrical body 21 are connected via a bellows-shaped metal expansion tube 30 that expands and contracts in the axial direction of the kiln body 1 and has flexibility in the radial direction. 【0028】 The first seal section 10 has a gland packing 12 interposed between the first cylindrical body 11 and the seal base 1b. The gland packing 12 prevents leakage of raw material powder and gas from the kiln body 1. 【0029】 The gland packing 12 is provided in four adjacent turns in the axial direction of the kiln body 1. The gland packing 12a at both ends in the axial direction of the kiln body 1 contains carbon fiber, and the gland packing 12b in the middle contains aramid fiber, so that the ends in the axial direction of the kiln body 1 are harder than the middle section. 【0030】 These gland packings 12 are sandwiched between lantern rings 13 and pressed axially against the kiln body 1 by packing retainers 14 of the first cylindrical body 11 via the lantern rings 13. The lantern rings 13 are provided with a grease inlet 13a. 【0031】 By injecting grease through the grease inlet 13a of the lantern ring 13, lubrication and sealing performance between the gland packing 12, the seal base 1b, and the first cylindrical body 11 are improved, and wear of the gland packing 12 is suppressed. 【0032】 Furthermore, the second seal portion 20 has a lip packing 22 interposed between the second cylindrical body 21 and the seal base 1b. The lip packing 22 prevents gas leakage from the kiln body 1, and two lip packings 22 are attached to the inside of the second cylindrical body 21, closer to the first seal portion 10, using fixing members 23a and 23b, and two lip packings 22 are attached to the outside, on the opposite side, using fixing members 24a and 24b. 【0033】 The lip packing 22 is pre-formed to bend at an intermediate point between the attachment portion to the second cylindrical body 21 and the contact portion to the seal base 1b of the kiln body 1. 【0034】 The two inner lip packings 22 and the two outer lip packings 22 are bent in a direction that brings them closer together on the side that contacts the sealing base 1b, and the space between adjacent lip packings 22 is wider than necessary to prevent interference due to bending. 【0035】 Furthermore, a mounting adapter 25 is used to attach the lip packing 22 to the second cylindrical body 21, and this adapter conforms to the curved shape of the lip packing 22 formed by its molding. The two lip packings 22 are attached to the second cylindrical body 21 in an assembled state. 【0036】 In the second cylindrical body 21 of the second seal portion 20, a gas inlet 26 is provided between the two inner lip packings 22 and the two outer lip packings 22 for supplying nitrogen gas to the space formed between the seal base 1b and the second cylindrical body 21. 【0037】 The nitrogen gas injected through the gas inlet 26 increases the contact pressure between the two inner lip packings 22 and the two outer lip packings 22 and the seal base 1b. In addition to nitrogen gas, other inert gases such as argon gas may also be supplied. 【0038】 In a rotary kiln as described above, even if the heights of the first cylinder 11 of the first seal section 10 and the second cylinder 21 of the second seal section 20 differ slightly during the assembly process, the axes of the first cylinder 11 and the second cylinder 21 can be finely adjusted separately without being affected by the other by appropriately extending and flexing the telescopic tube 30, thereby absorbing the axial misalignment with respect to the axis of the kiln body 1, and thus excellent sealing performance can be easily obtained. 【0039】 Furthermore, by varying the hardness of the gland packing 12 at both ends and in the middle of the kiln body 1 in the axial direction, and making the hardness of the gland packing 12a at both ends higher than the hardness of the gland packing 12b in the middle, the sealing performance of the first seal section 10 is maintained for a long period of time. 【0040】 Furthermore, since the lip packing 22 is pre-formed into a bent shape, it is possible to prevent the lip packing 22 from turning inside out when the second seal portion 20 is attached to the second cylindrical body 21 or when the rotary kiln is in operation, thereby achieving the desired sealing performance of the second seal portion 20. 【0041】 Furthermore, since the pre-formed lip packing 22 is attached to the second cylindrical body 21 using a mounting adapter 25 that conforms to its curved shape, the attachment of the lip packing 22 to the second sealing portion 20 becomes easier, preventing the occurrence of attachment defects and reliably preventing the lip packing 22 from turning inside out. 【0042】 Furthermore, the two lip packings 22 can be attached to the second cylindrical body 21 in an assembled state, which reduces the man-hours required for replacing the lip packings 22 when they wear out. [Explanation of symbols] 【0043】 1. Kiln body 1a Inside the kiln 1b Sticker stand 2 Fixed part 2a Food 3. Support frame 3a Shim plate 10. First seal section 11 First cylinder 12, 12a, 12b Gland Packing 13 Lantern Rings 13a Grease inlet 14. Packing retainer 20 Second seal section 21 Second cylinder 22 Lip packing 23a, 23b, 24a, 24b Fixing members 25 Mounting Adapters 26 Gas inlet 30 Telescopic tube

Claims

[Claim 1] The kiln comprises a rotating kiln body (1) that transports raw materials and a fixed part (2) located at its end, and the space between the kiln body (1) and the fixed part (2) is sequentially sealed in stages by a first seal part (10) and a second seal part (20). The first sealing portion (10) is configured to include a first cylindrical body (11) provided at intervals on the outer circumference of the kiln body (1) as a component of the fixing portion (2), and a gland packing (12) interposed between the first cylindrical body (11) and the kiln body (1). The second sealing portion (20) is configured to include a second cylindrical body (21) arranged in series with respect to the first cylindrical body (11) in the axial direction of the kiln body (1) as a member of the fixing portion (2), and a lip packing (22) interposed between the second cylindrical body (21) and the kiln body (1). A rotary kiln in which the first cylindrical body (11) and the second cylindrical body (21) are connected via an expansion joint (30) that expands and contracts in the axial direction of the kiln body (1) and is flexible in the radial direction. [Claim 2] The rotary kiln according to claim 1, characterized in that a plurality of gland packings (12) are provided in the axial direction of the kiln body (1), and the gland packings (12a) at both ends are harder than the gland packing (12b) in the middle. [Claim 3] The rotary kiln according to claim 2, characterized in that, of the gland packing (12), the gland packing (12a) at both ends in the axial direction of the kiln body (1) contains carbon fiber, and the gland packing (12b) in the middle part contains aramid fiber. [Claim 4] The rotary kiln according to any one of claims 1 to 3, characterized in that the lip packing (22) used is pre-formed to bend at an intermediate portion between the attachment portion to the second cylindrical body (21) and the contact portion to the kiln body (1). [Claim 5] The rotary kiln according to claim 4, characterized in that a mounting adapter (25) for attaching the lip packing (22) to the second cylindrical body (21) is used that conforms to the bent shape of the lip packing (22) formed by molding.

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