Sealing structure and sealing adjustment method of rotary kiln

Abstract

The invention discloses a rotary kiln sealing structure and a sealing adjustment method. The rotary kiln sealing structure comprises a kiln tail cover, a kiln body, a kiln body fixing ring, a rotating ring, and a flexible connection ring. The kiln tail cover has an opening, the kiln body is sleeved in the opening, the kiln body can rotate relative to the kiln tail cover, the kiln body fixing ring is relatively fixed to the kiln body, the rotating ring is sleeved in the opening and contacts with the inner circumference of the opening, and the flexible connection ring connects the kiln body fixing ring and the rotating ring, and the flexible connection ring is a flexible connection. The kiln body fixing ring relatively fixed on the kiln body and the rotating ring sleeved in the opening of the kiln tail cover are connected by the flexible connection ring, so that the irregular movement of the kiln body during the rotation process is absorbed, the requirement of the relative position stability of the sealing surface is ensured, and the problem of a large amount of leakage of the sealing surface caused by a short circuit of the sealing surface due to the movement is fundamentally solved.

Description

Technical Field

[0001] The invention relates to a rotary kiln sealing structure and a sealing adjustment method. Background Art

[0002] Rotary kilns are widely used in the field of industrial production due to their wide adaptability to raw materials, high reaction intensity, simple equipment structure, and easy operation and maintenance. However, due to the large size of rotary kiln equipment and the large equipment specifications, the equipment processing error is large, and the thermal expansion of the high-temperature working environment further amplifies the relative error, which makes it difficult to seal the inlet / outlet end of the equipment. Currently, the commonly used sealing methods include fish scale seals, packing seals, labyrinth seals, etc., which have average sealing effects. Therefore, most rotary kilns are currently used in scenarios with low sealing requirements, such as material drying, cement kiln calcination, and solid waste / hazardous waste incineration. In recent years, due to the increasingly stringent environmental protection requirements, new technologies represented by pyrolysis and gasification that have strict requirements on the leakage of the reaction environment have continued to emerge, and higher requirements have been placed on the sealing performance of rotary kiln equipment. There is an urgent need for an efficient sealing structure to meet the higher requirements for the development of rotary kiln equipment.

[0003] There are mainly two sealing methods in the prior art, including the traditional packing sealing method and the packing + protective gas combination sealing method. The traditional packing sealing method is to connect the rotating part of the cylinder and the fixed part of the hood tail through a sliding component to form a cavity, and fill the cavity with packing to seal. Traditional sealing packing generally has axial packing seals and radial packing seals. The radial packing arrangement overcomes the problem of the packing being tight on the top and loose on the bottom due to the gravity effect of the vertical axial seal, but the size limitation leads to a smaller sealing surface. In addition, the packing absorbs the expansion and movement of the cylinder, which easily forms a short-circuit channel on the packing sealing surface, resulting in a significant decrease in the actual sealing performance. The packing + protective gas combination sealing method is to press the packing on the cylinder through an elastic expansion sheet, but it takes time to offset the expansion and movement of the cylinder during operation by compressing the packing deformation, and the strength of the packing itself cannot be deformed at any time to fit the movement, which easily leads to leakage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the filler itself cannot be deformed at any time to fit the string, thus easily causing leakage, and provide a rotary kiln sealing structure and a sealing adjustment method.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a rotary kiln sealing structure, which comprises:

[0007] A kiln tail hood, wherein the kiln tail hood has an opening;

[0008] A kiln body, wherein the kiln body is sleeved in the opening and the kiln body can rotate relative to the kiln tail cover;

[0009] A kiln body fixing ring, wherein the kiln body fixing ring is fixed relative to the kiln body;

[0010] A rotating ring, which is sleeved in the opening and contacts with the inner circumference of the opening;

[0011] A flexible connection ring connects the kiln body fixed ring and the rotating ring, and the flexible connection ring is a flexible connection.

[0012] In the present technical solution, a kiln body fixed ring relatively fixed on the kiln body and a rotating ring sleeved in the opening of the kiln tail cover are connected by a soft connecting ring, so that irregular movement of the kiln body during rotation is absorbed, ensuring the requirement of stable relative position of the sealing surface, and fundamentally solving the problem of large leakage of the sealing surface caused by short circuit of the sealing surface due to movement.

[0013] Preferably, a radially protruding limit piece is formed at the opening, the rotating ring is in contact with the inner circumferential surface of the limit piece, an outer annular cavity and an inner annular cavity are formed between the rotating ring and the limit piece, the outer annular cavity and the inner annular cavity respectively include an inlet and an outlet, adjacent inlets and outlets are respectively located on both sides of the outer annular cavity and the inner annular cavity, the inlet and the outlet can be connected to each other, the outer annular cavity and the inner annular cavity are provided with packing and a spring for sealing, and one end of the packing is pressed by a spring.

[0014] In the present technical solution, the adjacent inlet and outlet are respectively located on both sides of the outer annular cavity and the inner annular cavity, making the leakage path more complicated and reducing the possibility of leakage. At the same time, the outer annular cavity and the inner annular cavity are provided with fillers and springs, and one end of the filler is pressed by the spring, and the filler fully fills the outer annular cavity and the inner annular cavity, so that the sealing effect is better.

[0015] Preferably, the annular cavity between the outer annular cavity and the inner annular cavity forms an oil cavity.

[0016] In the technical solution, the oil cavity formed between the outer annular cavity and the inner annular cavity realizes liquid oil sealing through oil, which further brings about cooling and lubrication of the sealing packing.

[0017] Preferably, the kiln body, the kiln body fixing ring, the flexible connection ring, the rotating ring and the kiln tail cover form an annular air chamber, and an inert gas is introduced into the annular air chamber.

[0018] In the present technical solution, the inert gas introduced into the formed annular air chamber can form an airtight state in the closed space formed between the kiln body, the kiln body fixing ring, the flexible connection ring and the kiln tail cover, further increasing the sealing effect and protecting the sealing performance.

[0019] Preferably, a stop moving ring is provided on the outer circumference of the tail end of the kiln body, a stop static ring is provided on the inner circumference of the kiln tail cover, and a seal is used between the stop moving ring and the stop static ring.

[0020] In the present technical solution, the use of a seal between the kiln body's dynamic stop ring and the kiln tail hood's static stop ring can achieve a better sealing effect, while ensuring a better sealing effect for the kiln body and kiln tail hood in different motion states.

[0021] Preferably, a heat insulating layer is provided between the kiln body and the kiln body fixing ring, the heat insulating layer is fixed to the outer peripheral surface of the kiln body, and the kiln body fixing ring is fixed to the heat insulating layer.

[0022] In this technical solution, the kiln body and the kiln body fixing ring are separated by a heat insulating layer, which can effectively isolate the high-temperature working area and the sealing area in the kiln body, thereby improving the stability and effectiveness of the entire sealing operation.

[0023] Preferably, the kiln body fixing ring comprises a radial section and an axial section, the radial section connects the axial section and the thermal insulation layer, the axial section, the radial section and the thermal insulation layer form a cavity, and the cavity is used for passing a cooling medium.

[0024] In the present technical solution, the axial section, the radial section and the heat insulation layer form a cavity, and the high temperature zone and the low temperature zone in the kiln can be further isolated by the cooling medium entering the cavity, thereby further improving the stability and effectiveness of the system.

[0025] Preferably, a plurality of rotation limiting rods are provided on the circumference of the flexible connection ring, and the plurality of rotation limiting rods are respectively connected to the kiln body fixing ring and the rotating ring.

[0026] In the technical solution, a plurality of rotation limit rods are provided around the circumference of the flexible connection ring, and the rotation limit rods can transmit the force to ensure the normal operation of the flexible connection without affecting the axial expansion and contraction performance of the flexible connection.

[0027] Preferably, the rotary kiln sealing structure includes a roundness detector and an adjustable support body, the roundness detector is fixed to the outer circumferential surface of the upper end of the limiter, the adjustable support body is fixed to the outer circumferential surface of the lower end of the limiter, and the roundness detector and the adjustable support body are located on the same vertical line.

[0028] In this technical solution, the setting of the roundness detector can ensure that the axial seal can operate within a reasonable range in the vertical direction and can be compensated and adjusted in real time through the adjustable support body, avoiding the undesirable condition of the axial seal being tight on the top and loose on the bottom due to the effect of gravity, thereby improving the service life of the system during long-term operation.

[0029] The present invention also provides a sealing adjustment method, which is performed in the aforementioned rotary kiln sealing structure, wherein the rotary kiln sealing structure further comprises an air filling port, wherein the air filling port is connected to an air chamber, wherein the air filling port is connected to an air passage, and a pressure measuring point is provided on the air passage, wherein the sealing adjustment method comprises:

[0030] Set high pressure point and low pressure point;

[0031] Detect gas seal pressure through pressure measuring points;

[0032] If the air seal pressure is lower than the low pressure point, the air is inflated through the inflation port to replenish the pressure;

[0033] If the air seal pressure reaches the high pressure point, stop blowing.

[0034] In this technical solution, a pressure measuring point is provided on the airway to regularly detect the air pressure, ensure that the air sealing pressure is between the high pressure point and the low pressure point, maintain the air sealing pressure, and ensure the stability of the seal.

[0035] The positive and progressive effect of the present invention is that the kiln body fixed ring relatively fixed on the kiln body and the rotating ring sleeved in the opening of the kiln tail cover are connected by a soft connecting ring, so that the irregular movement of the kiln body during the rotation process is absorbed, the requirement of the relative position stability of the sealing surface is ensured, and the problem of large-scale leakage of the sealing surface caused by short circuit of the sealing surface due to movement is fundamentally solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a front cross-sectional view of a preferred embodiment of the present invention.

[0037] Figure 2 for Figure 1 A partial enlarged view of part A.

[0038] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along line AA.

[0039] Figure 4 It is a side cross-sectional view of the oil chamber of a preferred embodiment of the present invention.

[0040] Description of reference numerals:

[0041] Kiln tail hood 1

[0042] Opening 101

[0043] Kiln 2

[0044] Kiln body fixing ring 3

[0045] Radial section 301

[0046] Axial section 302

[0047] Rotating ring 4

[0048] Soft connection ring 5

[0049] Rotation limit rod 6

[0050] Limiter 7

[0051] The first limiting ring 701

[0052] Fastening rod 702

[0053] Second limiting ring 703

[0054] Outer ring cavity 8

[0055] Inner ring cavity 9

[0056] Exit 10

[0057] Import 11

[0058] Packing 12

[0059] Spring 13

[0060] Oil chamber 14

[0061] Oil outlet 141

[0062] Oil inlet 142

[0063] Annular air chamber 15

[0064] Stop ring 16

[0065] Stop ring 17

[0066] Seal 18

[0067] Insulation layer 19

[0068] Cavity 20

[0069] Roundness tester 21

[0070] Adjustable support 22

[0071] Inflatable port 23

[0072] Airway 24

[0073] Pressure measuring point 25 DETAILED DESCRIPTION

[0074] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0075] like Figure 1 As shown, the present invention discloses a rotary kiln sealing structure, which includes: a kiln tail cover 1, a kiln body 2, a kiln body fixed ring 3, a rotating ring 4, and a flexible connection ring 5. The kiln tail cover 1 has an opening 101, the kiln body 2 is sleeved in the opening 101, and the kiln body 2 can rotate relative to the kiln tail cover 1. The kiln body fixed ring 3 is relatively fixed to the kiln body 2, the rotating ring 4 is sleeved in the opening 101 and contacts the inner circumference of the opening 101, and the flexible connection ring 5 connects the kiln body fixed ring 3 and the rotating ring 4, and the flexible connection ring 5 is a flexible connection. A plurality of rotation limiting rods 6 are arranged in the circumference of the flexible connection ring 5, and the plurality of rotation limiting rods 6 are respectively connected to the kiln body fixed ring 3 and the rotating ring 4.

[0076] Among them, the kiln body fixed ring 3 relatively fixed on the kiln body 2 and the rotating ring 4 sleeved in the opening 101 of the kiln tail cover 1 are connected by the soft connection ring 5, so that the irregular movement of the kiln body 2 during the rotation process is absorbed, and the relative position stability of the dynamic and static sealing surfaces is ensured, which fundamentally solves the problem of a large amount of leakage on the sealing surface caused by a short circuit on the sealing surface due to movement. In this embodiment, the soft connection ring 5 is set as a rubber soft connection, and other soft connections can also be used. A plurality of rotation limit rods 6 are arranged around the circumference of the soft connection ring 5, and the rotation limit rods 6 can transmit the force to ensure that the soft connection can operate normally when rotating with the kiln body 2, and at the same time, the axial expansion and contraction performance of the soft connection ring 5 is not affected.

[0077] like Figure 1-Figure 2 As shown, a radially protruding stopper 7 is formed at the opening 101, the rotating ring 4 contacts the inner circumference of the stopper 7, and an outer annular cavity 8 and an inner annular cavity 9 are formed between the rotating ring 4 and the stopper 7. Specifically, in this embodiment, the stopper 7 includes a first stopper ring 701, a fastening rod 702, and a second stopper ring 703. The first stopper ring 701 contacts the outer circumference of the rotating ring 4, the first stopper ring 701 and the second stopper ring 703 are connected by the fastening rod 702, and an outer annular cavity 8 and an inner annular cavity 9 are formed between the rotating ring 4 and the second stopper ring 703. The outer annular cavity 8 and the inner annular cavity 9 respectively include an inlet 11 and an outlet 10, and the adjacent inlets 11 and outlets 10 are respectively located on both sides of the outer annular cavity 8 and the inner annular cavity 9, and the inlet 11 and the outlet 10 can be connected to each other. The outer annular cavity 8 and the inner annular cavity 9 are provided with a packing 12 and a spring 13 for sealing, and one end of the packing 12 is pressed by the spring 13. Specifically, the annular cavity between the outer annular cavity 8 and the inner annular cavity 9 forms an oil cavity 14.

[0078] Among them, the adjacent inlet 11 and outlet 10 are respectively located on both sides of the outer annular cavity 8 and the inner annular cavity 9, making the leakage path more complicated and reducing the possibility of leakage. At the same time, the outer annular cavity 8 and the inner annular cavity 9 are provided with a filler 12 and a spring 13, and one end of the filler 12 is pressed by the spring 13, and the filler 12 fully fills the outer annular cavity 8 and the inner annular cavity 9, so that the sealing effect is better. In this embodiment, if Figure 4 As shown, the oil cavity 14 is also provided with an oil outlet 141 and an oil inlet 142, and the oil outlet 141 and the oil inlet 142 are evenly arranged around the end surface of the oil cavity 14, with one oil outlet 141 arranged just above the end surface, and the rest are oil inlets 142. High-temperature lubricating oil can be selected to provide lubrication, sealing and cooling for the sealing structure. The oil cavity 14 formed between the outer annular cavity 8 and the inner annular cavity 9 realizes liquid oil sealing through oil, which further brings cooling and lubrication of the sealing packing 12.

[0079] like Figure 1 As shown, the kiln body 2, the kiln body fixing ring 3, the flexible connection ring 5, the rotating ring 4 and the kiln tail cover 1 form an annular air chamber 15, and an inert gas is introduced into the annular air chamber 15.

[0080] The inert gas introduced into the annular air chamber 15 can form an airtight state in the space between the kiln body 2, the kiln body fixing ring 3, the flexible connection ring 5 and the kiln tail cover 1, further increasing the sealing effect and protecting the sealing performance.

[0081] like Figure 1 to Figure 2 As shown, a stop ring 16 is provided on the outer circumference of the tail end of the kiln body 2, and a stop ring 17 is provided on the inner circumference of the kiln tail cover 1. A seal 18 is used to seal the stop ring 16 and the stop ring 17.

[0082] The sealing member 18 between the kiln body 2 stop ring 16 and the kiln tail cover 1 can achieve better sealing effect and ensure better sealing effect of the kiln body 2 and the kiln tail cover 1 in different motion states. Specifically, the sealing member 18 is a high-temperature flexible filler 12.

[0083] like Figure 1 to Figure 2 As shown, a heat insulating layer 19 is provided between the kiln body 2 and the kiln body fixing ring 3, the heat insulating layer 19 is fixed to the outer peripheral surface of the kiln body 2, and the kiln body fixing ring 3 is fixed to the heat insulating layer 19. Specifically, the kiln body fixing ring 3 includes a radial section 301 and an axial section 302, the radial section 301 connects the axial section 302 and the heat insulating layer 19, and the axial section 302, the radial section 301 and the heat insulating layer 19 form a cavity 20, and the cavity 20 is used to pass the cooling medium.

[0084] The kiln body 2 and the kiln body fixing ring 3 are separated by a heat insulating layer 19, which can effectively isolate the high temperature area and the sealing area in the kiln body 2, thereby improving the stability and effectiveness of the entire sealing operation. The axial section 302, the radial section 301 and the heat insulating layer 19 form a cavity 20, and the high temperature area and the low temperature area in the kiln can be further isolated by the cooling medium entering the cavity 20, thereby further improving the stability and effectiveness of the system. The cooling medium can be wind, water, or other cooling media.

[0085] like Figure 1 and Figure 3 As shown, the rotary kiln sealing structure includes a roundness detector 21 and an adjustable support body 22. The roundness detector 21 is fixed to the outer circumference of the upper end of the limiter 7, and the adjustable support body 22 is fixed to the outer circumference of the lower end of the limiter 7. The roundness detector 21 and the adjustable support body 22 are located on the same vertical line.

[0086] Among them, the setting of the roundness detector 21 can ensure that the vertical direction of the seal can operate within a reasonable range and can be compensated and adjusted in real time by the adjustable support body 22, so as to avoid the unfavorable condition of tightness and looseness on the sealing surface due to gravity in the vertical direction of the seal, and improve the service life of the system during long-term operation. Specifically, by setting the alarm value, the sealing condition is checked according to the data detected by the roundness detector 21. In this embodiment, when the roundness detector 21 is installed for the first time, the beating range is ensured to be within 2mm, and the data is recorded. During the operation of the kiln body 2 of the rotary kiln, the percentage display number is checked regularly. When the range of the limiter 7 reaches the alarm value of 3mm, the state of the filler 12 has formed a working condition of tightness on the top and looseness on the bottom. It is necessary to adjust the position in time through the adjustable support body 22 on the same vertical line of the roundness detector 21, so that the beating range of the roundness detector 21 is adjusted to within the normal working condition to ensure the sealing effect of the rotary kiln.

[0087] In this embodiment, the present invention also provides a sealing adjustment method, which is performed in the aforementioned rotary kiln sealing structure. The rotary kiln sealing structure also includes an inflation port 23, which is connected to the annular air chamber 15. The inflation port 23 is connected to an air duct 24, and a pressure measuring point 25 is provided on the air duct 24. The sealing adjustment method includes: setting a high pressure point and a low pressure point; detecting the air sealing pressure through the pressure measuring point 25; if the air sealing pressure is lower than the low pressure point, inflating and compensating the pressure through the inflation port 23; if the air sealing pressure reaches the high pressure point, stopping the inflation.

[0088] Among them, by providing a pressure measuring point 25 on the air chamber airway 24 connected to the inflation port 23, the air pressure can be regularly detected to ensure that the air sealing pressure is between the high pressure point and the low pressure point, maintain the air sealing pressure, and ensure the stability of the seal. In this embodiment, nitrogen is selected as the inert protective gas, the low pressure point is set to 150Pa, the high pressure point is set to 400Pa, and the pressure of the annular air chamber 15 is monitored. When the air sealing pressure is lower than 150Pa, the air is inflated through the inflation port 23 to replenish the pressure. When the air sealing pressure reaches 400Pa, the air is stopped to maintain the air sealing pressure.

[0089] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A rotary kiln sealing structure, characterized in that: It includes: A kiln tail hood, wherein the kiln tail hood has an opening; A kiln body, wherein the kiln body is sleeved in the opening and the kiln body can rotate relative to the kiln tail cover; A kiln body fixing ring, wherein the kiln body fixing ring is fixed relative to the kiln body; A rotating ring, which is sleeved in the opening and contacts with the inner circumference of the opening; a flexible connecting ring, which connects the kiln body fixed ring and the rotating ring, and the flexible connecting ring is a flexible connection; A radially protruding limiter is formed at the opening, the rotating ring is in contact with the inner circumferential surface of the limiter, an outer annular cavity and an inner annular cavity are formed between the rotating ring and the limiter, the outer annular cavity and the inner annular cavity respectively include an inlet and an outlet, adjacent inlets and outlets are respectively located on both sides of the outer annular cavity and the inner annular cavity, the inlet and the outlet can be connected to each other, the outer annular cavity and the inner annular cavity are provided with packing and a spring for sealing, and one end of the packing is pressed by a spring.

2. The rotary kiln sealing structure according to claim 1, characterized in that: The annular cavity between the outer annular cavity and the inner annular cavity forms an oil cavity.

3. The rotary kiln sealing structure according to claim 1, characterized in that: The kiln body, the kiln body fixing ring, the flexible connection ring, the rotating ring and the kiln tail cover form an annular air chamber, and an inert gas is introduced into the annular air chamber.

4. The rotary kiln sealing structure according to claim 1, characterized in that: A stop ring is arranged on the outer circumference of the tail end of the kiln body, and a stop ring is arranged on the inner circumference of the kiln tail cover. The stop ring and the stop ring are sealed by a sealing member.

5. The rotary kiln sealing structure according to claim 1, characterized in that: A heat insulation layer is provided between the kiln body and the kiln body fixing ring. The heat insulation layer is fixed to the outer peripheral surface of the kiln body, and the kiln body fixing ring is fixed to the heat insulation layer.

6. The rotary kiln sealing structure according to claim 5, characterized in that: The kiln body fixing ring comprises a radial section and an axial section, the radial section connects the axial section and the heat insulation layer, the axial section, the radial section and the heat insulation layer form a cavity, and the cavity is used for passing a cooling medium.

7. The rotary kiln sealing structure according to claim 1, characterized in that: A plurality of rotation limiting rods are arranged around the circumference of the flexible connection ring, and the plurality of rotation limiting rods are respectively connected to the kiln body fixing ring and the rotating ring.

8. The rotary kiln sealing structure according to claim 1, characterized in that: The rotary kiln sealing structure includes a roundness detector and an adjustable support body, the roundness detector is fixed to the outer circumference of the upper end of the limiter, the adjustable support body is fixed to the outer circumference of the lower end of the limiter, and the roundness detector and the adjustable support body are located on the same vertical line.

9. A sealing adjustment method, characterized in that: The sealing adjustment method is performed in a rotary kiln sealing structure according to any one of claims 1 to 8, wherein the rotary kiln sealing structure further comprises an air filling port, the air filling port is connected to an annular air chamber, the air filling port is connected to an air passage, and a pressure measuring point is provided on the air passage, and the sealing adjustment method comprises: Set high pressure point and low pressure point; Detect gas seal pressure through pressure measuring points; If the air seal pressure is lower than the low pressure point, the air is inflated through the inflation port to replenish the pressure; If the air seal pressure reaches the high pressure point, stop blowing.

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