CN212006707U

CN212006707U - Novel kiln head sealing structure

Info

Publication number: CN212006707U
Application number: CN202020520207.2U
Authority: CN
Inventors: 陈剑; 吴建平; 吕响荣; 张博; 刘世杰; 袁梦霞
Original assignee: Atea (shanghai) Environmental Ltd
Current assignee: Atea (shanghai) Environmental Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-11-24
Anticipated expiration: 2030-04-10

Abstract

The utility model provides a novel kiln head sealing structure, which comprises a plurality of graphite blocks which are sequentially connected end to end and enclose into a circular ring shape, and an elastic clamp which is arranged corresponding to each graphite block; the graphite block is provided with a through hole, and a pin penetrates through the through hole; the elastic clamp is 7-shaped, one end of the elastic clamp is fixed on the kiln head cover, and the other end of the elastic clamp tightly presses the graphite block on the kiln head cover through a U-shaped clamp; the top of the graphite block is provided with a groove, a steel wire rope is embedded in the groove, one end of the steel wire rope is fixed on the kiln head cover, the other end of the steel wire rope is connected with a tightening device used for tightening the steel wire rope so as to enable the steel wire rope to be tightly pressed in the groove, and the bottom of the graphite block is tightly attached to the rotary kiln. The utility model has the advantages that: the main part of the sealing structure is a graphite block, an axial static seal exists between the graphite block and the kiln head cover, a radial dynamic seal exists between the graphite block and the rotary kiln, the stability of the whole sealing structure is ensured, and the mounting and the adjustment are convenient.

Description

Novel kiln head sealing structure

Technical Field

The utility model relates to the sealed technical field of rotary kiln hood that burns the trade useless admittedly especially relates to a novel kiln hood seal structure.

Background

The hazardous waste is identified and determined according to a method uniformly specified by the state, has the properties of toxicity, inflammability, explosiveness, corrosiveness, chemical reaction and the like, and can cause harm to the health and the environment of a human body, such as medical waste, polychlorinated biphenyl waste, waste batteries, waste mineral oil, mercury-containing waste fluorescent tubes and the like. The hazardous waste needs to be treated to enter the environment, the incineration method is one of the most effective hazardous waste treatment methods, and at present, more than 90 percent of the national hazardous waste treatment centers adopt hazardous waste incineration treatment systems. Among them, the rotary kiln is one of the most effective equipments in the incineration treatment of hazardous wastes, and has the advantages of various kinds of treatable wastes, large treatment capacity, etc. The technology of rotary kiln treatment of hazardous waste has been adopted in developed countries such as the united states, canada, japan, etc. as early as the 70 th century. China began in the last 90 th century by gradually applying rotary kiln incineration systems to treat hazardous wastes.

The rotary kiln is developed from a cement rotary kiln, the main body of the rotary kiln is a horizontal and rotatable cylindrical barrel, the shell is made of steel plates in a rolling mode, and refractory materials are lined inside the shell; the axis of the cylinder body keeps a certain inclination angle with the horizontal plane, solid and semisolid waste enters the kiln from one high end (head) through the feeding machine and slowly moves to the tail along with the rotation of the cylinder body. The rotation of the kiln body makes the materials fully contact with combustion air in the combustion process to complete the whole processes of drying, combustion and burnout, the flue gas in the cylinder body is introduced into a secondary combustion chamber, and the burnt ash and slag are discharged by an ash discharging machine.

The rotary kiln for burning the hazardous waste usually runs under negative pressure, occasionally positive pressure is generated, and as the rotary kiln is a rotating device and a kiln hood device connected with the end part of the rotary kiln is a static device, in order to ensure the sealing of a movable part and a static part, a sealing assembly is required to be installed to prevent the infiltration of external air under the negative pressure and the outward leakage of high-temperature smoke inside under the positive pressure. However, the combustion-supporting fan cannot be put into operation due to a large amount of air leakage at the kiln head, the combustion atmosphere in the kiln is difficult to be effectively controlled, and positive-pressure smoke gas leakage caused by the fluctuation of feeding causes the smoke gas (containing a large amount of carbon black, CO and H2) which is not fully combusted in the kiln to leak into the environment, so that the surrounding environment is polluted, and the performance of the sealing structure at the kiln head of the rotary kiln is particularly important in the normal operation process of the rotary kiln.

The kiln head seal is a structure for connecting the rotary kiln and the kiln head cover and is used for sealing the gap between the dynamic and static equipment and preventing the internal medium from leaking or external air from permeating. The kiln head cover is positioned at the end part of the rotary kiln, and the panel of the kiln head cover is provided with a feed inlet, a burner, a sight glass and other structures, so that the kiln head cover is static equipment for providing materials and heat sources for the rotary kiln.

At present, the rotary kiln head seal in the solid waste incineration industry mainly comprises a contact type fish scale seal and a non-contact type labyrinth seal, and is widely used due to simple structure, convenient installation and lower cost, but has obvious defects.

Mainly comprises the following steps: the metal scale and the friction ring contact of fish scale seal structure for fixed top realize sealed, because the metal scale is out of shape easily under high temperature, and all need overlap joint each other between every two scales in order to reduce the clearance between the scale, on the other hand rotary kiln barrel is because manufacturing deviation and high temperature influence all can produce certain ovality, and these have all led to appearing the clearance between scale and the gyration barrel, thereby influenced the sealed effect of fish scale. In addition, because hard sealing is adopted between the fish scale and the rotary kiln cylinder, the fish scale is gradually worn and consumed, and larger gaps appear between sealing surfaces to influence the sealing effect.

The other sealing technology, labyrinth seal, is divided into radial and axial labyrinth. Although the labyrinth seal has a simple structure, does not have a contact surface, and does not have the influence of abrasion problem and kiln body movement, the factors of thermal barrier cold contraction, bending, radial run-out and the like of the kiln body are considered, so the axially or radially reserved clearance of the labyrinth seal cannot be too small, which also determines that the labyrinth seal has an unsatisfactory sealing effect and has the problems of air leakage and material leakage.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior art, and firstly provides a novel kiln head sealing structure.

The utility model discloses a realize through following technical scheme:

the utility model provides a novel kiln head sealing structure, which comprises a plurality of graphite blocks which are sequentially connected end to end and enclose a circular ring shape, and an elastic clamp which is arranged corresponding to each graphite block; the graphite block is provided with a through hole, and a pin penetrates through the through hole; the elastic clamp is 7-shaped, one end of the elastic clamp is fixed on the kiln head cover, and the other end of the elastic clamp tightly presses the graphite block on the kiln head cover through a U-shaped clamp;

the top of the graphite block is provided with a groove, a steel wire rope is embedded in the groove, one end of the steel wire rope is fixed on the kiln head cover, the other end of the steel wire rope is connected with a tightening device used for tightening the steel wire rope so as to enable the steel wire rope to be tightly pressed in the groove, and the bottom of the graphite block is tightly attached to the rotary kiln.

Preferably, the graphite block is of an arc-shaped strip structure, and the bending radius of the inner arc of the graphite block is the same as that of the rotary kiln.

Preferably, the two ends of the graphite block are processed with matched concave-convex structures, the directions of the concave-convex structures are opposite, and corners of the concave-convex structures are in arc transition.

Preferably, one end of the elastic clamp is fixed on the kiln head cover through an n-shaped clamp, and the other end of the elastic clamp is fixedly connected with the U-shaped clamp in an inserting mode.

Preferably, a through clamping hole is formed in the middle of the bottom side of the U-shaped clamp, a limiting clamping rod is fixed between two sides of the U-shaped clamp corresponding to the clamping hole, the other end of the elastic clamp is inserted between the limiting clamping rod and the bottom side of the U-shaped clamp and is pressed against one end of the pin, and the other end of the pin is pressed against the kiln head cover.

Preferably, the tightening device comprises a spring fixedly connected with the other end of the steel wire rope, a screw fixedly connected with the free end of the spring, a fixing piece for the screw to penetrate through and be fixed on the kiln head cover, and nuts respectively spirally connected with the screw and respectively and correspondingly pressed on two sides of the fixing piece.

In the embodiment, the main part of the sealing structure is the graphite block, an axial static seal is formed between the graphite block and the kiln head cover, and a radial dynamic seal is formed between the graphite block and the rotary kiln, so that the stability of the whole sealing structure is ensured, and the sealing structure is convenient to install and adjust.

Drawings

Fig. 1 is a schematic structural diagram of a novel kiln head sealing structure provided by an embodiment of the present invention;

fig. 2 is a partial enlarged view of a portion b in fig. 1 according to an embodiment of the present invention;

fig. 3 is a partial enlarged view of the point c in fig. 1 according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of fig. 1 provided by an embodiment of the present invention;

fig. 5 is a partial enlarged view of a portion of fig. 4 according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a graphite block according to an embodiment of the present invention;

fig. 7 is a front view of fig. 1 provided by an embodiment of the present invention;

fig. 8 is a partial enlarged view of a portion d in fig. 7 according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

For the convenience of understanding the novel kiln head sealing structure provided by the embodiment of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Please refer to fig. 1-8 together, fig. 1 is a schematic structural diagram of a novel kiln head sealing structure provided by an embodiment of the present invention, fig. 2 is a partial enlarged view of b in fig. 1 provided by an embodiment of the present invention, fig. 3 is a partial enlarged view of c in fig. 1 provided by an embodiment of the present invention, fig. 4 is a cross-sectional view of fig. 1 provided by an embodiment of the present invention, fig. 5 is a partial enlarged view of a in fig. 4 provided by an embodiment of the present invention, fig. 6 is a schematic structural diagram of a graphite block provided by an embodiment of the present invention, fig. 7 is a front view in fig. 1 provided by an embodiment of the present invention, and fig. 8 is a partial enlarged view of d in fig. 7 provided by an embodiment of the present invention.

As shown in fig. 1-8, the novel kiln head sealing structure comprises a plurality of graphite blocks 1 which are sequentially connected end to form a circular ring shape, and an elastic clamp 2 which is arranged corresponding to each graphite block 1. The graphite block 1 is provided with a through hole 3 in the middle, the diameter of the through hole 3 is 12.5mm, and a steel pin 4 is inserted into the through hole 3, and the diameter of the pin 4 is 12 mm; the elastic card 2 is integrally of a 7-shaped structure and is made of spring steel, one end of the elastic card 2 is fixed on the kiln head cover 5, and the other end of the elastic card compresses the graphite block 1 on the kiln head cover 5 through the U-shaped clamp 6.

The top of the graphite block 1 is provided with a groove 7, a steel wire rope 8 is embedded in the groove 7, one end of the steel wire rope 8 is fixed on the kiln head cover 5, the other end of the steel wire rope 8 is connected with a tightening device for tightening the steel wire rope 8 so as to enable the steel wire rope 8 to be tightly pressed in the groove 7, and the bottom of the graphite block 1 is tightly attached to the rotary kiln 9. The steel wire ropes 8 are specifically embedded into the grooves 7 at the tops of all the graphite blocks 1, and the two ends of the steel wire ropes are crossed and surrounded and then extend in opposite directions.

It should be noted here that the kiln hood cover 5 is installed and set up in the tip of rotary kiln 9, and kiln hood cover 5 is circular structure, and the fixed welding of kiln hood cover 5 inboard has a round kiln hood cover sealing steel plate 12 along circumference, and elasticity card 2 specifically compresses tightly graphite block 1 on kiln hood cover sealing steel plate 12, makes graphite block 1 and kiln hood cover sealing steel plate 12 in close contact with, and the fixed welding has a round rotary kiln sealing steel plate 18 along circumference outside the tip of rotary kiln 9 installation kiln hood cover 5, and graphite block 1 bottom specifically closely laminates with rotary kiln sealing steel plate 18.

In this embodiment, the graphite block 1 is a circular arc-shaped strip structure, and the bending radius of the inner arc of the graphite block 1 is the same as that of the rotary kiln 9, so as to ensure that the graphite block 1 and the rotary kiln sealing steel plate 18 arranged outside the rotary kiln 9 can be tightly attached together. The both ends processing of graphite block 1 has the concave-convex structure 10 of matching, concave-convex structure 10's opposite orientation and turning be the circular arc transition, and the purpose is to ensure can end to end and closely laminate between arbitrary two graphite blocks 1. The concave-convex structure 10 specifically comprises a groove structure arranged at one end of the graphite block 1 and a protruding structure arranged at the other end of the graphite block 1, and the protruding structure can be tightly inserted into the groove structure of the adjacent graphite block 1.

A pin 4 is inserted into the through hole 3 of each graphite block 1, and the pin 4 is compressed through the elastic card 2 corresponding to the graphite block 1, so that the graphite block 1 is compressed on a kiln head cover sealing steel plate 12 on the inner side of a kiln head cover 5 by the pin 4, the surface of the graphite block 1 contacting with the kiln head cover sealing steel plate 12 is in the axial direction, the graphite block 1 is compressed on the kiln head cover sealing steel plate 12, and the sealing effect is influenced by the rotation following of the graphite block 1 when the rotary kiln 9 rotates.

The one end of the elastic clamp 2 is fixed on the kiln head cover 5 through the n-shaped clamp 11, when the elastic clamp is fixed, the n-shaped clamp 11 is welded and fixed on the kiln head cover 5, when the kiln head cover is welded, two ends of the n-shaped clamp 11 are welded and fixed with the kiln head cover 5, a clamping gap is formed between the middle part of the n-shaped clamp 11 and the kiln head cover 5, one end of the elastic clamp 2 is processed into an s-shaped bend which can be clamped in the clamping gap between the middle part of the n-shaped clamp 11 and the kiln head cover 5, and the other end of the elastic clamp is fixedly connected.

Specifically, a through clamping hole is formed in the middle of the bottom side of the U-shaped clamp 6, a limiting clamping rod 13 is fixed between two sides of the U-shaped clamp 6 corresponding to the clamping hole, the limiting clamping rod 13 is parallel to the bottom side of the U-shaped clamp 6, a clamping gap is formed between the limiting clamping rod 13 and the bottom side of the U-shaped clamp 6, and the other end of the elastic clamp 2 is processed into a V-shaped bend which can be clamped in the clamping gap between the limiting clamping rod 13 and the bottom side of the U-shaped clamp 6 in a plugging mode.

During the installation, make U type press from both sides the screens hole of 6 and align with through-hole 3 of graphite block 1, the elasticity card 2 has the one end that the V-arrangement was bent and pegs graft in the block clearance between the bottom side of spacing kelly 13 and U type clamp 6, the sunken one side of above-mentioned V-arrangement arc of bending supports and presses on spacing kelly 13, the protruding one side of arc supports and presses in the screens hole of U type clamp 6 and supports and press the one end at pin 4, the other end of pin 4 then supports and presses on kiln hood 5, particularly, the other end of pin 4 supports and presses on kiln hood sealing steel plate 12, receive the effect of pin 4, one side of graphite block 1 closely laminates on kiln hood sealing steel plate 12, with graphite block 1 follows the commentaries on classics and influences sealed effect when avoiding rotary kiln hood 9 to rotate.

The face that graphite block 1 and kiln hood sealed steel sheet 12 contacted is in the axial direction, press from both sides 11 and U type through the n type and press from both sides 6 and correspond elasticity card 2 of 1 installation of every graphite block, elasticity card 2 adopts the spring steel to make, have very strong toughness, rely on elasticity card 2 and press graphite block 1 tightly on kiln hood sealed steel sheet 12 through U type clamp 6, form the static seal, effectively prevent through the aforesaid setting that graphite block 1 from taking place to remove in the axial direction simultaneously.

Axial movement of the graphite block 1 in the axial direction is effectively prevented by the arrangement, and radial movement of the graphite block 1 is limited in the radial direction by the tightening device. Specifically, the tightening device comprises a spring 14 fixedly connected with the other end of the steel wire rope 8, a screw rod 15 fixedly connected with the free end of the spring 14, a fixing piece 16 for the screw rod 15 to penetrate through and be fixed on the kiln head cover 5, and nuts 17 which are respectively in spiral connection with the screw rod 15 and respectively and correspondingly abut against the two sides of the fixing piece 16.

Specifically, after the steel wire rope 8 is wound in the grooves 7 at the tops of all the graphite blocks 1 for one circle, the two ends of the steel wire rope are crossed and extend in opposite directions, finally, one end of the steel wire rope 8 is fixedly connected to the kiln head cover 5 through a rope locking block, the other end of the steel wire rope is connected with the tightening device, the position of the screw 15 relative to the fixing piece 16 can be changed through spirally adjusting two nuts 17 on the screw 15, the length of the spring 14 can be changed, the tensioning degree of the steel wire rope 8 can be changed through adjusting the length of the spring 14, the pressing force of the graphite blocks 1 on a rotary kiln sealing steel plate 18 outside the rotary kiln 9 is adjusted, and dynamic sealing is formed, namely, the graphite blocks 1 cannot rotate along.

Preferably, the steel wire ropes 8 and the correspondingly arranged tightening devices are provided with a plurality of groups, specifically four groups, so as to ensure that all the graphite blocks 1 can be compressed.

In the embodiment, the graphite block 1 is used as a sealing block, is high-temperature resistant and not easy to deform, has a self-lubricating function, and can ensure that a sealing gap is smaller and a better sealing effect is achieved after a sealing surface is subjected to finish machining; the two ends of the graphite block 1 are processed into concave-convex structures, so that the graphite blocks can be tightly assembled together, and meanwhile, a certain margin is reserved during head-to-tail matching, so that a sealing ring formed by the graphite blocks can better absorb radial run-out and axial movement of the rotary kiln; when the graphite block 1 is compressed, the elastic clamp 2 made of spring steel is axially adopted, and the positioning screw 4 is arranged at the center of the graphite block 1, so that one side of the graphite block 1 can be effectively compressed on the kiln head cover sealing steel plate 12, and meanwhile, the graphite block 1 is prevented from rotating along with the rotary kiln 9 under the action of friction force, and the stability of the whole sealing structure is ensured; the radial seal is tensioned by a plurality of steel wire ropes 8, the pressing force is adjusted by adjusting the length of a spring 14 on the tightening device, and the radial seal is simple in structure, convenient to install and good in adjustability.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A novel kiln head sealing structure is characterized by comprising: a plurality of graphite blocks which are sequentially connected end to form a circular ring shape, and an elastic clamp which is arranged corresponding to each graphite block; the graphite block is provided with a through hole, and a pin penetrates through the through hole; the elastic clamp is 7-shaped, one end of the elastic clamp is fixed on the kiln head cover, and the other end of the elastic clamp tightly presses the graphite block on the kiln head cover through a U-shaped clamp;

2. The novel kiln head sealing structure as claimed in claim 1, wherein the graphite block is in a circular arc-shaped strip structure, and the bending radius of the inner arc of the graphite block is the same as that of the rotary kiln.

3. The novel kiln head sealing structure as claimed in claim 1, wherein the two ends of the graphite block are processed with matching concave-convex structures, the concave-convex structures are opposite in orientation and the corners are in arc transition.

4. The novel kiln head sealing structure as claimed in claim 1, wherein one end of the elastic clamp is fixed on the kiln head cover through an n-shaped clamp, and the other end is fixedly inserted into the U-shaped clamp.

5. The novel kiln head sealing structure as claimed in claim 4, wherein a through-hole is formed in the middle of the bottom side of the U-shaped clamp, a limiting clamping rod is fixed between the two sides of the U-shaped clamp corresponding to the clamping hole, the other end of the elastic clamp is inserted between the limiting clamping rod and the bottom side of the U-shaped clamp and is pressed against one end of the pin, and the other end of the pin is pressed against the kiln head cover.

6. The kiln head sealing structure as claimed in claim 1, wherein the tightening device comprises a spring fixedly connected with the other end of the steel wire rope, a screw fixedly connected with a free end of the spring, a fixing plate for the screw to penetrate through and fix on the kiln head cover, and nuts respectively spirally connected with the screw and respectively and correspondingly pressed on two sides of the fixing plate.