SEALING DEVICE FOR OXY-FUEL ROTARY CALCINATION KILN

Abstract

A sealing device for an oxy-fuel rotary calcining kiln arranged on the outer side of a rotating cylinder (5) comprises a tensioning device (1), a rotating cover (4), a fixed cover (14) and a static friction ring cover (18); a brush (8) and a sealing flap steel sheet (6) are arranged on the inner side of a sleeve of the fixed cover; dynamic friction rings (3, 13) are respectively fixed on the upper part and the right side of the rotating cover; static friction rings (2, 12) are respectively arranged on the left and right sides of the ring cover; the tensioning device (1) external to the ring cover presses against the fixed cover; packings (9, 10) are arranged on the outer side of the sleeve of the fixed cover, and the pressure is adjusted by a packing pressure adjusting device. Figure 2

Description

Title of the invention: SEALING DEVICE FOR AN OXY-FUEL ROTARY CALCINATION KILN Technical field

[0001] The present disclosure relates to a sealing device for an oxy-fuel rotary calcination kiln and belongs to the technical field of rotary kilns. Background

[0002] Oxy-fuel calcination technology is one of the technologies that currently achieve significant energy savings in the cement industry. It can reduce the ignition point of the fuel, accelerate the calcination speed of the fuel, promote the complete calcination of the fuel, increase the flame temperature, reduce the smoke after calcination, improve the heat utilization rate, and reduce the emission of nitrogen oxides in the exhaust gas. An oxy-fuel calcination rotary kiln is a kiln into which high-concentration oxygen and carbon dioxide are blown, and no air can enter in order to prevent nitrogen from participating in chemical reactions in this kiln, thereby reducing the production of nitrogen oxides. In order to realize the oxy-fuel calcination technology in cement calcination, the sealing aspect of the rotary kiln is a key technology.Due to the high temperature at the seal during the operation of the rotary kiln and the rotation of the cylinder at the seal accompanied by swinging and axial movement, it is very difficult to ensure the sealing and airtight effect. Invention presentation.

[0003] In order to overcome the technical problems mentioned in the context, the present disclosure provides a sealing device for an oxy-fuel rotary calcining kiln, which adopts a sealing method in which carbon dioxide is used to fill gaps and isolate air. It can effectively ensure the use of the oxy-fuel rotary calcining kiln and solve the sealing problem of the oxy-fuel rotary calcining kiln.

[0004] In order to solve the above-mentioned technical problem, the present disclosure proposes the following technical solution.

[0005] A sealing device for an oxy-fuel rotary calcining kiln is provided, arranged on the outer side of a rotating cylinder. The sealing device comprises a tension device, a rotating cover, a fixed cover and a static friction ring cover; a brush and a sealing flap steel sheet are respectively arranged on the inner side of a sleeve of the fixed cover; the rotating cover is also fixed on the outer side of the rotating cylinder and has a dynamic friction ring a fixed on its upper part and a dynamic friction ring b fixed on its right side; the static friction ring cover is also arranged on the outer side of the rotating cover, and a static friction ring a and a static friction ring b are respectively arranged on the left and right sides of the static friction ring cover; the static friction ring a and the dynamic friction ring a are press-fitted and the static friction ring b and the dynamic friction ring b are press-fitted;the tensioning device is installed on the outer side of the static friction ring cover, one end of the tensioning device presses against the fixed cover, and the tensioning device has a certain tension to provide the static friction ring cover with a force causing a tendency to move away from the fixed cover; a seal a and a seal b are also arranged on the outer side of the sleeve of the fixed cover, and a spacer ring is arranged between the seal a and the seal b, and the pressure is adjusted by a seal pressure adjusting device; and outer peripheries of the seal a and the seal b are connected to the right bottom of the static friction ring cover located on the upper side thereof, and slide axially together with the static friction ring cover. ;

[0006] In addition, the static friction ring cover is also connected to a slight positive pressure (overpressure) carbon dioxide source, and the carbon dioxide enters the static friction ring cover through an air inlet.

[0007] Furthermore, a vent hole c and a vent hole b are further provided in the static friction ring cover and the spacer ring is provided with a vent hole a; the vent hole c is located at the top of the static friction ring b on the right side of the static friction ring cover, and the vent hole b is located between the seal a and the seal b at the bottom of the static friction ring cover.

[0008] Furthermore, carbon dioxide reaches the packing a and the packing b through the vent hole c, the vent hole b and the vent hole a. In a case in which there is a small gap between the packing b and the outer side of the sleeve of the fixed cover, the rotary kiln is filled with carbon dioxide; in a case in which there is a small gap between the packing a and the outer side of the sleeve of the fixed cover, the carbon dioxide overflows to ensure that air cannot enter the rotary kiln.

[0009] Further, the outer diameter ends of the wiper and the sealing flap steel sheet are fixed on the inner side of the sleeve of the fixed cover and the inner sides of the wiper and the sealing flap steel sheet are press-fitted with the outer diameter surface of the rotating cylinder.

[0010] Furthermore, in a case in which the rotating cylinder moves axially, the static friction ring a and the dynamic friction ring a are interference-fitted, and the static friction ring b and the dynamic friction ring b are interference-fitted; in a case in which the rotating cylinder rotates and oscillates, the static friction ring a and the dynamic friction ring a continue to abut and slide relative to each other, and the static friction ring b and the dynamic friction ring b continue to abut and slide relative to each other.

[0011] Furthermore, the sealing device for the oxy-fuel rotary calcining kiln is further provided with a friction ring lubrication system which is configured to supply the lubricating oil to lubricate sliding surfaces between the aforementioned friction rings.

[0012] Further, two static friction ring cover supports are attached to the fixed cover to limit rotation of the static friction ring cover along the axis but allow axial movement of the static friction ring cover.

[0013] Furthermore, a dust outlet cover is arranged at the bottom of the static friction ring cover, so that it is possible to clean the dust inside the static friction ring cover.

[0014] Furthermore, the seal pressure adjustment device is configured as a bolt-nut compression structure; the fixed cover has an L-shaped structure; the tension device is configured as an air cylinder, a hydraulic rod, a spring tension structure or a ballast structure; the rotating cover has an L-shaped structure; the static friction ring cover has a gate-shaped structure.

[0015] Compared with the prior art, the present disclosure has the following beneficial effects.

[0016] The present disclosure adopts a sealing method in which carbon dioxide is used to fill gaps and isolate air, which can effectively ensure the application and use of the oxy-fuel rotary calcining kiln. The two sets of friction ring end face compression structures solve the problem of rotation and deflection of the cylinder. Two sets of packings solve the problem of axial movement of the cylinder. Carbon dioxide is discharged between the two sets of friction rings and between the two sets of packings to isolate air from the inlet of the rotary kiln. The broom and the sealing flap steel sheet can prevent fly ash from entering the sealed area. The present disclosure has broad prospects of application and good economic and technical effects. Brief description of the drawings

[0017] [Fig-1] [Fig. 1] is an axial view of a sealing device for an oxy-fuel rotary calcining kiln of the present disclosure;

[0018] [Fig.2] [Fig.2] is a sectional view taken on line AA in [Fig.l]; and

[0019] [Fig.3] [Fig.3] is a side view of [Fig.l]. Description of the embodiments

[0020] The technical solutions in the embodiments of the present disclosure will be clearly and fully described below with respect to the drawings in the embodiment of the present disclosure. Obviously, the embodiments described herein are only some embodiments, not all embodiments of the present disclosure. All other embodiments obtained by the person skilled in the art based on the embodiments of the present disclosure without creative efforts are within the scope of protection of the present disclosure.

[0021] It should be noted that all directional indications, such as upper, lower, left, right, front, rear ... in the embodiments of the present disclosure are only used to explain a relative positional relationship, movement, etc. between the components in a specific attitude. If the specific attitude changes, the directional indications will change accordingly.

[0022] Furthermore, terms such as "first", "second", etc. in the present disclosure are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined by the term "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "a plurality of" means at least two, such as two, three, etc. unless expressly and specifically indicated otherwise.

[0023] In the present disclosure, unless expressly and specifically indicated otherwise, the terms "connected", "fixed" and their derivatives are to be understood in a broad sense. For example, the connection may be a fixed connection or a detachable or integral connection; it may be a mechanical connection or it may be an electrical connection; it may be a direct connection or an indirect connection through an intermediate means, and it may be an internal communication of two components or an interaction relationship between two components, unless otherwise indicated. For the person skilled in the art, the specific meanings of the above terms in the present disclosure may be understood according to the specific conditions.

[0024] Furthermore, the technical solutions of the various embodiments of the present disclosure may be combined with each other, but must be based on the condition that the combination must be implementable by the person skilled in the art. Where the combination of technical solutions contains contraindications or cannot be implemented, it must be considered that such a combination of technical solutions does not exist and is not within the scope of protection of the present disclosure. It should be understood that the specific embodiments described herein are only illustrative of the present disclosure and are not intended to limit the present disclosure.

[0025] Referring to Figures 1 to 3, a specific embodiment of the present disclosure relates to a sealing device for an oxy-fuel rotary calcining kiln, the sealing device is arranged on the outer side of a rotating cylinder 5 and comprising a tension device 1, an L-shaped rotating cover 4, an L-shaped fixed cover 14 and a door-shaped static friction ring cover 18.

[0026] As shown in [Fig.2], a brush 8 and a sealing flap steel sheet 6 are arranged at an inner side of a fixed cover sleeve 14. The outer diameter ends of the brush 8 and the sealing flap steel sheet 6 are fixed on the inner side of the fixed cover sleeve 14 and the inner sides of the brush 8 and the sealing flap steel sheet 6 are interference fitted with the outer diameter surface of the rotating cylinder 5. Due to the elasticity of the brush 8 and the sealing flap steel sheet 6, the brush 8 and the sealing flap steel sheet 6 can come into interference fit with the rotating cylinder 5 to prevent dust in a case in which the rotating cylinder 5 swings and moves axially, thereby preventing fly ash in the furnace from entering the areas of the friction ring b and the packing b.

[0027] The rotary cover 4 is also fixed on the outer side of the rotary cylinder 5 and has a dynamic friction ring a 3 fixed on an upper part and a dynamic friction ring b 13 fixed on a right side. The dynamic friction ring a 3 and the dynamic friction ring b 13 which are fixed on the rotary cover 4 can rotate, oscillate and move axially together with the rotary cylinder 5.

[0028] The static friction ring cover 18 is also arranged on the outer side of the rotary cover 4, and a static friction ring a 2 and a static friction ring b 12 are respectively arranged on the left and right sides of the static friction ring cover 18. The static friction ring a 2 and the static friction ring b 12 can slide axially together with the static friction ring cover 18. The static friction ring a 2 is press-fitted with the dynamic friction ring a 3, and the static friction ring b 12 is interference-fitted with the dynamic friction ring b 13. In a case in which the rotating cylinder 5 moves axially, the static friction ring a 2 and the dynamic friction ring a 3 are interference-fitted, and the static friction ring b 12 and the dynamic friction ring b 13 are interference-fitted. In a case in which the rotating cylinder 5 rotates and oscillates, the static friction ring a 2 and the dynamic friction ring a 3 continue to abut and slide relative to each other, and the static friction ring b 12 and the dynamic friction ring b 13 continue to abut and slide relative to each other.The sealing device for the oxy-fuel rotary calcination kiln is further provided with a friction ring lubrication system 22 which is configured to supply the lubricating oil to lubricate sliding surfaces between the aforementioned friction rings.

[0029] The tensioning device 1 is installed on the outer side of the static friction ring cover 18, and one end of the tensioning device 1 presses against the fixed cover 14. The tensioning device 1 has a certain tension to provide the static friction ring cover 18 with a force causing a tendency to move away from the fixed cover 14. This embodiment adopts a hydraulic rod structure.

[0030] A seal a 9 and a seal b 10 are also arranged at an outer side of the fixed cover sleeve 14 and a spacer ring 7 is arranged between the seal a 9 and the seal b 10, and the pressure is adjusted by a seal pressure adjusting device 11 so that the seal a 9 and the seal b 10 are press-fitted with the outer side of the fixed cover sleeve 14 and can slide axially. In this embodiment, a bolt-nut compression structure is adopted to serve as the seal pressure adjusting device 11.The outer peripheries of the seal a 9 and the seal b 10 are connected to the right bottom of the static friction ring cover 18 arranged above and slide axially together with the static friction ring cover 18.

[0031] As shown in [Fig.3], the static friction ring cover 18 is also connected with a slightly overpressure carbon dioxide source, and the carbon dioxide enters the static friction ring cover 18 through an air inlet 20. In a case in which there is a small gap between the static friction ring a 2 and the dynamic friction ring a 3, some carbon dioxide overflows. In a case in which there is a small gap between the static friction ring b 12 and the dynamic friction ring b 13, carbon dioxide enters the rotary furnace.

[0032] A vent hole c 17 and a vent hole b 16 are provided in the static friction ring cover 18, and the spacer ring 7 is provided with a vent hole a 15. The vent hole c 17 is located at the top of the static friction ring b 12 on the right side of the static friction ring cover 18, and the vent hole b 16 is located between the seal a 9 and the seal b 10 at the bottom of the static friction ring cover 18. Carbon dioxide reaches the seal a 9 and the seal b 10 through the vent hole c 17, the vent hole b 16, and the vent hole a 15. In a case in which there is a small gap between the seal b 10 and the outer side of the sleeve of the fixed cover 14, the carbon dioxide enters the rotary kiln.In a case in which there is a small gap between the sealing gasket a 9 and the outer side of the fixed cover sleeve 14, carbon dioxide overflows to ensure that air cannot enter the rotary kiln.

[0033] As shown in [Fig.l], two static friction ring cover supports 19 are fixed on the fixed cover 14 in order to limit the rotation of the static friction ring cover 18 along the axis but allow the axial displacement of the static friction ring cover 18.

[0034] In this embodiment, as shown in [Fig. 3], a dust outlet cover 21 is arranged at the bottom of the static friction ring cover 18, so that it is possible to clean the dust inside the static friction ring cover 18.

[0035] Although the embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that various modifications, changes, substitutions, and variations of the embodiments may be made therein without departing from the spirit and scope of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

Claims

1. A sealing device for an oxy-fuel rotary calcining kiln, arranged on an outer side of a rotating cylinder (5), characterized in that the sealing device comprises a tension device (1), a rotating cover (4), a fixed cover (14) and a static friction ring cover (18), in which a brush (8) and a sealing flap steel sheet (6) are respectively arranged at the inner side of a sleeve of the fixed cover (14); the rotating cover (4) is also fixed on an outer side of the rotating cylinder (5) and has a dynamic friction ring a (3) fixed on its upper part and a dynamic friction ring b (13) fixed on its right side;the static friction ring cover (18) is also arranged on the outer side of the rotating cover (4), and a static friction ring a (2) and a static friction ring b (12) are respectively arranged on the left and right sides of the static friction ring cover (18); the static friction ring a (2) and the dynamic friction ring a (3) are clamped together, and the static friction ring b (12) and the dynamic friction ring b (13) are clamped together; the tensioning device (1) is installed on the outer side of the static friction ring cover (18), one end of the tensioning device (1) presses against the fixed cover (14), and the tensioning device (1) has a certain tension to provide the static friction ring cover (18) with a force causing a tendency to move away from the fixed cover (14);a seal a (9) and a seal b (10) are also arranged at the outer side of the sleeve of the fixed cover (14) and a spacer ring (7) is arranged between the seal a (9) and the seal b (10), and the pressure is adjusted by a seal pressure adjusting device (11); and the outer peripheries of the seal a (9) and the seal b (10) are connected to the right bottom of the static friction ring cover (18) located on their upper side, and slide axially together with the static friction ring cover (18).;

2. Sealing device for an oxy-fuel rotary calcining kiln according to claim 1, characterized in that the static friction ring cover (18) is also connected with a source of carbon dioxide at slight overpressure, and the carbon dioxide enters the static friction ring cover (18) through an air inlet (20).

3. A sealing device for an oxy-fuel rotary calcining kiln according to claim 2, characterized in that a vent hole c (17) and a vent hole b (16) are further provided in the static friction ring cover (18) and the spacer ring (7) is provided with a vent hole a (15); the vent hole c (17) is located at the top of the static friction ring b (12) on the right side of the static friction ring cover (12), and the vent hole b (16) is located between the seal a (9) and the seal b (10) at the bottom of the static friction ring cover (18).

4. A sealing device for an oxy-fuel rotary calcining kiln according to claim 3, characterized in that carbon dioxide reaches the seal a (17) and the seal b (16) via the vent hole c (17), the vent hole b (16) and the vent hole a (15); in a case in which there is a small gap between the seal b (10) and the outer side of the fixed cover sleeve (14), carbon dioxide enters the rotary kiln; in a case in which there is a small gap between the seal a (9) and the outer side of the fixed cover sleeve (14), carbon dioxide overflows to ensure that air cannot enter the rotary kiln.

5. A sealing device for an oxy-fuel rotary calcining kiln according to claim 4, characterized in that the outer diameter ends of the brush (8) and the sealing flap steel sheet (6) are fixed on the inner side of the fixed cover sleeve (14), and the inner sides of the brush (8) and the sealing flap steel sheet (6) are press-fitted with the outer diameter surface of the rotating cylinder (5).

6. A sealing device for an oxy-fuel rotary calcining kiln according to claim 5, characterized in that, in a case in which the rotating cylinder (5) moves axially, the static friction ring a (2) and the dynamic friction ring a (3) are interference-fitted, and the static friction ring b (12) and the dynamic friction ring b (13) are interference-fitted; in a case in which the rotating cylinder (5) rotates and oscillates, the static friction ring a (2) and the dynamic friction ring a (3) continue to be in abutment and slide relative to each other, and the static friction ring b (12) and the dynamic friction ring b (13) continue to be in abutment and slide relative to each other.

7. A sealing device for an oxy-fuel rotary calcining kiln according to claim 6, characterized in that the sealing device is further provided with a friction ring lubrication system (22) which is configured to supply lubricating oil to lubricate the sliding surfaces between the friction rings.

8. A sealing device for an oxy-fuel rotary calcining kiln according to claim 7, characterized in that two static friction ring cover supports (19) are fixed on the fixed cover (14) in order to limit the rotation of the static friction ring cover (18) along the axis but allow axial displacement of the static friction ring cover (18).

9. A sealing device for an oxy-fuel rotary calcining kiln according to any one of claims 1 to 8, characterized in that a dust outlet cover (21) is arranged at the bottom of the static friction ring cover (18), in order to clean the dust inside the static friction ring cover (18).

10. A sealing device for an oxy-fuel rotary calcining kiln according to any one of claims 1 to 9, characterized in that the packing pressure adjustment device (11) is configured as a bolt-nut compression structure; the fixed cover (14) has an L-shaped structure; the tensioning device (1) is configured as an air cylinder, a hydraulic rod, a spring tension structure or a ballast structure; the rotating cover (4) has an L-shaped structure; the static friction ring cover (18) has a door-shaped structure.

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