Sealing device for pure-oxygen rotary kiln

Abstract

The invention relates to a sealing device for an oxy-fuel calcination rotary kiln. The sealing device is arranged on outer side of a rotary cylinder and includes a tensioner, a rotary cover, a fixed cover and a static friction ring cover; a brush and a sealing flap steel sheet are respectively arranged at a sleeve of the fixed cover; the rotary cover is fixed on the rotary cylinder and has two dynamic friction rings; the static friction ring cover is arranged outside of the rotary cover, and two static friction rings are respectively arranged on left and right sides of the static friction ring cover; the tensioner is installed outside of the static friction ring cover; two packing seals are arranged at outer side of the sleeve, and a spacer ring is arranged between the packing seals, and the pressure is adjusted by a packing seal pressure adjuster.

Description

TECHNICAL FIELD

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

[0002] Oxy-fuel calcination technology is one of the important energy-saving technologies in the cement industry at present. It can reduce the ignition point of fuel, accelerate the calcination speed of fuel, promote the complete calcination of fuel, increase the flame temperature, reduce smoke after calcination, improve heat utilization rate, and reduce emission of nitrogen oxides in exhaust gas. An oxy-fuel calcination rotary kiln refers to a kiln in which high-concentration oxygen and carbon dioxide are blew, and no air can enter so as to prevent nitrogen from participating in chemical reactions therein, thereby reducing the production of nitrogen oxides. To realize the oxy-fuel calcination technology in cement calcination, the sealing form 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 swing and axial movement, it is very difficult to ensure sealing and air-tight effect.SUMMARY

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

[0004] To solve the foregoing technical problem, the present disclosure provides the following technical solution.

[0005] Provided is a sealing device for an oxy-fuel calcination rotary kiln, arranged on outer side of a rotary cylinder. The sealing device includes a tensioner, a rotary cover, a fixed cover and a static friction ring cover; a brush and a sealing flap steel sheet are respectively arranged at inner side of a sleeve of the fixed cover; the rotary cover is also fixed on the outer side of the rotary 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 outer side of the rotary cover, and a static friction ring a and a static friction ring b are respectively arranged on left and right sides of the static friction ring cover; the static friction ring a and the dynamic friction ring a are in tight fit and the static friction ring b and the dynamic friction ring b are in tight fit; the tensioner is installed on outer side of the static friction ring cover, one end of the tensioner presses against the fixed cover, and the tensioner has a certain tension to provide the static friction ring cover with a force causing a trend away from the fixed cover; a packing seal a and a packing seal b are also arranged at outer side of the sleeve of the fixed cover, and a spacer ring is arranged between the packing seal a and the packing seal b, and the pressure is adjusted by a packing seal pressure adjuster; and outer peripherals of the packing seal a and the packing seal b are connected to right bottom of the static friction ring cover located on their upper side, and slide axially along with the static friction ring cover.

[0006] Further, the static friction ring cover is also connected with a slight positive pressure carbon dioxide gas source, and the carbon dioxide enters the static friction ring cover through an air inlet.

[0007] Further, an vent hole c and an vent hole b are further provided in the static friction ring cover, and the spacer ring is provided with an 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 packing seal a and the packing seal b at the bottom of the static friction ring cover.

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

[0009] Further, outer-diameter ends of the brush and the sealing flap steel sheet are fixed on the inner side of the sleeve of the fixed cover, and inner sides of the brush and the sealing flap steel sheet are in tight fit with outer diameter surface of the rotary cylinder.

[0010] Further, in a case where the rotary cylinder moves axially, the static friction ring a and the dynamic friction ring a are in tight fit, and the static friction ring b and the dynamic friction ring b are in tight fit; in a case where the rotary cylinder rotates and swings, the static friction ring a and the dynamic friction ring a keep abutting and slide relative to each other, and the static friction ring b and the dynamic friction ring b keep abutting and slide relative to each other.

[0011] Further, the sealing device for the oxy-fuel calcination rotary kiln is further provided with a friction ring lubricating system that is configured to provide lubricating oil to lubricate sliding surfaces between the above-mentioned friction rings.

[0012] Further, two static friction ring cover brackets are fixed on the fixed cover to limit the static friction ring cover from rotating along the axis but allow the static friction ring cover to move axially.

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

[0014] Further, the seal pressure adjuster is configured as a bolt-nut compression structure; the fixed cover has an L-shaped structure; the tensioner is configured as an air cylinder, hydraulic rod, spring tensioning or weight structure; the rotary 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 where carbon dioxide gas is used to fill gaps and isolate the air, which can effectively guarantee the application of the oxy-fuel calcination rotary kiln. The two sets of friction ring end face compression structures solve the rotation and deflection problem of the cylinder. Two sets of packing seals solve the axial movement problem of the cylinder. Carbon dioxide is filled between the two sets of friction rings and between the two sets of packing seals to isolate the air from entering the rotary kiln. The brush and the sealing flap steel sheet can prevent fly ash from entering the sealed area. The present disclosure has wide application prospects and good economic and technical effects.BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is an axial view of a sealing device for an oxy-fuel calcination rotary kiln of the present disclosure; FIG. 2 is a sectional view taken along A-A in Fig. 1; and FIG. 3 is a side view of FIG. 1. DESCRIPTION OF EMBODIMENTS

[0018] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in connection with the drawings in the embodiments of the present disclosure. Obviously, the embodiments described here are merely some, not all of the embodiments of the present disclosure. All other embodiments obtained by a skilled in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0019] It should be noted that all directional indications, such as upper, lower, left, right, front, back ......, in the embodiments of the present disclosure are only used to explain a relative positional relationship, motion, etc. between the components in a specific attitude. If the specific attitude changes, the directional indications will also change accordingly.

[0020] In addition, the wordings such as "first", "second", etc. in the present disclosure are only used for description purposes, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, 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 otherwise expressly and specifically defined.

[0021] In the present disclosure, unless otherwise expressly specified and defined, the terms "connected", "fixed" and their deformations should be understood in a broad sense. For example, the connection may be either a fixed connection or a detachable connection, or in one piece; it may be a mechanical connection, or it may be an electrical connection; it may be a direct connection or indirect connection through an intermediate medium, and may be an internal communication of two components or an interaction relationship between two components, unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present disclosure could be understood according to the specific conditions.

[0022] In addition, the technical solutions of the various embodiments of the present disclosure can be combined with each other, but must be based on the condition that the combination could be implemented by those skilled in the art. When the combination of technical solutions contains contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and does not fall within the protection scope of the present disclosure. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure.

[0023] Referring to FIGS. 1-3, a specific embodiment of the present disclosure discloses a sealing device for an oxy-fuel calcination rotary kiln, the sealing device is arranged on outer side of a rotary cylinder 5 and including a tensioner 1, an L-shaped rotary cover 4, an L-shaped fixed cover 14 and a gate-shaped static friction ring cover 18.

[0024] As shown in FIG. 2, a brush 8 and a sealing flap steel sheet 6 are arranged at an inner side of a sleeve of the fixed cover 14. Outer-diameter ends of the brush 8 and the sealing flap steel sheet 6 are fixed on the inner side of the sleeve of the fixed cover 14, and inner sides of the brush 8 and the sealing flap steel sheet 6 are in tight fit with the outer diameter surface of the rotary 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 tight fit with the rotary cylinder 5 to prevent dust in a case where the rotary cylinder 5 swings and moves axially, thereby preventing fly ash in the kiln from entering the areas of the friction ring b and the packing seal b.

[0025] 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 that are fixed on the rotary cover 4 can rotate, swing and move axially along with the rotary cylinder 5.

[0026] The static friction ring cover 18 is also arranged 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 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 along with the static friction ring cover 18. The static friction ring a 2 is in tight fit with the dynamic friction ring a 3, and the static friction ring b 12 is in tight fit with the dynamic friction ring b 13. In a case where the rotary cylinder 5 moves axially, the static friction ring a 2 and the dynamic friction ring a 3 are in tight fit, and the static friction ring b 12 and the dynamic friction ring b 13 are in tight fit. In a case where the rotary cylinder 5 rotates and swings, the static friction ring a 2 and the dynamic friction ring a 3 keep abutting and slide relative to each other, and the static friction ring b 12 and the dynamic friction ring b 13 keep abutting and slide relative to each other. The sealing device for the oxy-fuel calcination rotary kiln is further provided with a friction ring lubricating system 22 that is configured to provide lubricating oil to lubricate sliding surfaces between the above-mentioned friction rings.

[0027] The tensioner 1 is installed on outer side of the static friction ring cover 18, and one end of the tensioner 1 presses against the fixed cover 14. The tensioner 1 has a certain tension to provide the static friction ring cover 18 with a force causing a trend away from the fixed cover 14. This embodiment adopts a hydraulic rod structure.

[0028] A packing seal a 9 and a packing seal b 10 are also arranged at an outer side of the sleeve of the fixed cover 14, and a spacer ring 7 is arranged between the packing seal a 9 and the packing seal b 10, and the pressure is adjusted by a packing seal pressure adjuster 11 so that the packing seal a 9 and the packing seal b 10 come into tight fit with the outer side of the sleeve of the fixed cover 14 and can slide axially. In this embodiment, a bolt-nut compression structure is adopted to serve as the packing seal pressure adjuster 11. Outer peripherals of the packing seal a 9 and the packing seal b 10 are connected to the right bottom of the above-arranged static friction ring cover 18 and slide axially along with the static friction ring cover 18.

[0029] As shown in FIG. 3, the static friction ring cover 18 is also connected with a slight positive pressure carbon dioxide gas source, and carbon dioxide enters the static friction ring cover 18 through an air inlet 20. In a case where there is a small gap between the static friction ring a 2 and the dynamic friction ring a 3, some carbon dioxide gas overflows. In a case where there is a small gap between the static friction ring b 12 and the dynamic friction ring b 13, some carbon dioxide gas is filled into the rotary kiln.

[0030] An vent hole c 17 and an vent hole b 16 are provided in the static friction ring cover 18, and the spacer ring 7 is provided with an 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 packing seal a 9 and the packing seal b 10 at the bottom of the static friction ring cover 18. Carbon dioxide gas reaches the packing seal a 9 and the packing seal b 10 through the vent hole c 17, the vent hole b 16 and the vent hole a 15. In a case where there is a small gap between the packing seal b 10 and the outer side of the sleeve of the fixed cover 14, carbon dioxide gas is filled into the rotary kiln. In a case where there is a small gap between the packing seal a 9 and the outer side of the sleeve of the fixed cover 14, carbon dioxide gas overflows to ensure that the air cannot enter the rotary kiln.

[0031] As shown in FIG. 1, two static friction ring cover brackets 19 are fixed on the fixed cover 14 to limit the static friction ring cover 18 from rotating along the axis but allow the static friction ring cover 18 to move axially.

[0032] In this embodiment, as shown in FIG. 3, a dust outlet lid 21 is arranged at the bottom of the static friction ring cover 18, such that it is possible to clean the dust inside the static friction ring cover 18.

[0033] Although the embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that the various modifications, changes, substitutions, and variations of the embodiments may be made without departing from the spirit and scope of the present disclosure. The scope of the present disclosure is defined by the appended claims and their equivalents.

Claims

1. A sealing device for an oxy-fuel calcination rotary kiln, arranged on an outer side of a rotary cylinder (5), characterized in that, the sealing device comprising a tensioner (1), a rotary cover (4), a fixed cover (14) and a static friction ring cover (18), wherein a brush (8) and a sealing flap steel sheet (6) are respectively arranged at inner side of a sleeve of the fixed cover (14); the rotary cover (4) is also fixed on outer side of the rotary 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 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 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 in tight fit and the static friction ring b (12) and the dynamic friction ring b (13) are in tight fit; the tensioner (1) is installed on outer side of the static friction ring cover (18), one end of the tensioner (1) presses against the fixed cover (14), and the tensioner (1) has a certain tension to provide the static friction ring cover (18) with a force causing a trend away from the fixed cover (14); a packing seal a (9) and a packing seal b (10) are also arranged at outer side of the sleeve of the fixed cover (14), and a spacer ring (7) is arranged between the packing seal a (9) and the packing seal b (10), and the pressure is adjusted by a packing seal pressure adjuster (11); and outer peripherals of the packing seal a (9) and the packing seal b (10) are connected to right bottom of the static friction ring cover (18) located on their upper side, and slide axially along with the static friction ring cover (18).

2. The sealing device for an oxy-fuel calcination rotary kiln according to claim 1, characterized in that, the static friction ring cover (18) is also connected with a slight positive pressure carbon dioxide gas source, and carbon dioxide enters the static friction ring cover (18) through an air inlet (20).

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

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

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

6. The sealing device for an oxy-fuel calcination rotary kiln according to claim 5, characterized in that, in a case where the rotary cylinder (5) moves axially, the static friction ring a (2) and the dynamic friction ring a (3) are in tight fit, and the static friction ring b (12) and the dynamic friction ring b (13) are in tight fit; in a case where the rotary cylinder (5) rotates and swings, the static friction ring a (2) and the dynamic friction ring a (3) keep abutting and slide relative to each other, and the static friction ring b (12) and the dynamic friction ring b (13) keep abutting and slide relative to each other.

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

8. The sealing device for an oxy-fuel calcination rotary kiln according to claim 7, characterized in that, two static friction ring cover brackets (19) are fixed on the fixed cover (14) to limit the static friction ring cover (18) from rotating along axis but allow the static friction ring cover (18) to move axially.

9. The sealing device for an oxy-fuel calcination rotary kiln according to claim 1, characterized in that, a dust outlet lid (21) is arranged at the bottom of the static friction ring cover (18), such that to clean the dust inside the out of the static friction ring cover (18).

10. The sealing device for an oxy-fuel calcination rotary kiln according to claim 1, characterized in that, the seal pressure adjuster (11) is configured as a bolt-nut compression structure; the fixed cover (14) has an L-shaped structure; the tensioner (1) is configured as an air cylinder, hydraulic rod, spring tensioning or weight structure; the rotary cover (4) has an L-shaped structure; the static friction ring cover (18) has a gate-shaped structure.

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