CN210512581U

CN210512581U - High-efficiency cement clinker firing rotary kiln

Info

Publication number: CN210512581U
Application number: CN201921351933.XU
Authority: CN
Inventors: 田伟; 张宇; 孙培勇
Original assignee: Neixiang Baotianman Cement Co Ltd
Current assignee: Neixiang Baotianman Cement Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-05-12
Anticipated expiration: 2029-08-20

Abstract

The utility model provides a high-efficient cement clinker burns till rotary kiln, relate to the rotary kiln field, the barrel inner wall covers there is the refractory brick inside lining, the barrel internal fixation is equipped with spiral fender piece, kiln head tip is equipped with hollow backplate, the kiln head is still fixed outward and is equipped with the leaf spring, the leaf spring is located the backplate, the leaf spring both ends are curled to the direction that deviates from the barrel, kiln head tip is equipped with the end cover, the end cover is by the inner tube with outer L type structure of constituteing along, one side that outer edge was kept away from to the inner tube stretches into kiln head inside and with refractory brick inside lining fixed connection, outer edge and backplate fixed. The utility model effectively slows down the moving speed of the material in the decomposition zone, and leads the calcium carbonate in the material to be fully decomposed; the backplate receives the end cover protection, effectively improves the life of kiln head barrel and backplate, has reduced the number of times of changing backplate and kiln head barrel, and then promotes the production efficiency of rotary kiln.

Description

High-efficiency cement clinker firing rotary kiln

Technical Field

The utility model relates to a rotary furnace field, especially a high-efficient cement clinker burns till rotary kiln.

Background

The temperature of the kiln head of the cement rotary kiln is higher than that of the kiln tail, a welding seam at the kiln head generates thermal cracks at high temperature, so that the kiln head cracks, the working surface of the protective plate is not easy to build refractory materials, so that the damage of the protective plate is aggravated when secondary air passes through the protective plate at the kiln opening, the protective plate damaged cylinder can turn outwards to cause the section of the kiln head cylinder to lose efficacy, a factory stops the kiln to replace the cylinder and the protective plate, the continuous operation of production is seriously restricted, and the production efficiency of the rotary kiln is reduced; the decomposing belt of the rotary kiln mainly takes the decomposing task of magnesium carbonate and calcium carbonate in the raw material, the main component of the limestone raw material is calcium carbonate, calcium oxide is obtained after the calcium carbonate is decomposed, the calcium oxide is fully reacted with silicon oxide, iron oxide and aluminum oxide to improve the saturation coefficient of lime, but the calcium carbonate needs to absorb a large amount of heat for decomposition, but the heat transfer speed in the rotary kiln is very low, the moving speed of the material in the boundary belt is very high, the retention time is short, and the rotary kiln is one of the main contradictions affecting the calcination of clinker in the rotary kiln.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned condition, for overcoming prior art's defect, the utility model aims at providing a high-efficient cement clinker burns till rotary kiln, the moving speed of restriction decomposition in-band material promotes the lime saturation coefficient of grog with improving the calcium carbonate decomposition rate, reduces the backplate through the structure of optimizing the kiln head backplate and changes the number of times, promotes grog output.

The rotary kiln is characterized in that a spiral material blocking piece is fixedly arranged in the cylinder, a hollow protective plate is arranged at the end part of the kiln head, a plate spring is fixedly arranged outside the kiln head and is positioned in the protective plate, two ends of the plate spring are curled towards the direction deviating from the cylinder, an end cover is arranged at the end part of the kiln head, the end cover is of an L-shaped structure consisting of an inner cylinder and an outer edge, one side, far away from the outer edge, of the inner cylinder extends into the interior of the kiln head and is fixedly connected with the refractory brick lining, and the outer edge is fixedly connected with the protective plate.

Preferably, the barrel and the refractory brick lining are also coated with heat insulating materials.

Preferably, the backplate includes diameter by little first ring board, second ring board and the third ring board big, wherein first ring board is unanimous and all is in the same first disc of the equal fixedly connected with in one end of first ring board, second ring board and third ring board, the other end fixedly connected with second disc of third ring board, the second disc is parallel with first disc, end cover and first disc fixed connection, the leaf spring is located inside the backplate.

Preferably, the plate spring has at least two.

Preferably, the end cover is made of heat-resistant materials and is formed by splicing four parts.

Preferably, the spiral material blocking piece comprises a fixing portion and a guide portion, the fixing portion is fixedly connected with the inside of the barrel and is always perpendicular to the inner wall of the barrel, the guide portion is connected with one side, away from the barrel, of the fixing portion, the guide portion inclines towards the direction of the kiln head, and the inclination angle is smaller than the inclination angle of the barrel.

The utility model has the advantages that: the spiral material blocking piece is used for limiting the single moving distance of the material, so that the moving speed of the material in the decomposing belt is effectively reduced, and the calcium carbonate in the material is fully decomposed; the backplate receives the end cover protection, effectively improves the life of kiln head barrel and backplate, and backplate and barrel are connected radially floating, and the protective pressure distribution that the backplate was applyed on the barrel is more even, has reduced the number of times of changing backplate and kiln head barrel, and then promotes the production efficiency of rotary kiln.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a sectional view of the kiln head of the present invention along the axial direction;

FIG. 3 is a schematic view of the shield structure;

fig. 4 is a circumferential cross-sectional view of the kiln head part of the utility model.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in figures 1-4, the high-efficiency cement clinker firing rotary kiln comprises a cylinder body 1, a refractory brick lining 2 covers the inner wall of the cylinder body 1, the cylinder body 1 is inclined, a kiln tail 3 is arranged at the high end, a kiln head 4 is arranged at the low end, and the rotary kiln is characterized in that a spiral material blocking piece 5 is fixedly arranged in the cylinder body 1, the spiral material blocking piece 5 is arranged in a decomposing zone, so that materials can only advance towards a kiln mouth along the spiral material blocking piece 5, the material speed in the decomposing zone is reduced, calcium carbonate is fully decomposed, a hollow protective plate 6 is arranged at the end part of the kiln head 4, a plate spring 7 is further fixedly arranged outside the kiln head 4, the plate spring 7 is positioned in the protective plate 6, two ends of the plate spring 7 are curled towards the direction away from the cylinder body 1, the curled part of the plate spring 7 supports the protective plate 6, the protective plate 6 is in radial floating connection with the cylinder body 1 through the elasticity of the plate spring, and the floating connection effectively avoids uneven stress caused by coaxiality errors, the end part of the kiln head 4 is provided with an end cover 8, the end cover 8 is of an L-shaped structure consisting of an inner cylinder 81 and an outer edge 82, one side of the inner cylinder 81, which is far away from the outer edge 82, extends into the kiln head 4 and is fixedly connected with the refractory brick lining 2, and the outer edge 82 is fixedly connected with the guard plate 6. The end cover 8 completely isolates the protection plate 6 from the high temperature in the rotary kiln, and the accelerated aging and damage of the protection plate 6 at the high temperature are avoided.

And a heat insulating material 9 is coated between the cylinder body 1 and the refractory brick lining 2. The heat insulation material 9 effectively reflects the heat in the rotary kiln, and plays a role in heat preservation and heat insulation.

The backplate 6 includes that the diameter is by little big first ring board 61, second ring board 62 and third ring board 63, wherein first ring board 61 is unanimous with second ring board 62 length and all is short in third ring board 63, the same first disc 64 of the equal fixedly connected with of one end of first ring board 61, second ring board 62 and third ring board 63, the other end fixedly connected with second disc 65 of third ring board 63, second disc 65 is parallel with first disc 64, end cover 8 and first disc 64 fixed connection, leaf spring 7 is located inside backplate 6. Inlay barrel 1 between first ring board 61 and the second ring board 62, when backplate 6 radial displacement save when moving distance between first ring board 61 and the second ring board 62 is the distance of saving for the biggest, still need establish according to the outer layer of pouring of barrel 1 of conventional technical means, layer and leaf spring 7 are pour in effective separation of third ring board 63, wrap up leaf spring 7 in the inner space that seals relatively, prevent that leaf spring 7 from receiving external moist, rainwater corrosion.

The plate springs 7 are at least two. The more and evenly distributed the leaf springs 7 the better the floating connection.

The end cover 8 is made of heat-resistant materials and is formed by splicing four parts. The end cover 8 directly contacts with the high temperature in the rotary kiln, and the impact of secondary air is easy to damage, the service life of the end cover 8 is prolonged by the fireproof material, and the end cover is formed by splicing four parts, so that the end cover is convenient to mount and dismount.

Spiral material piece 5 includes fixed part and guide part, fixed part and the inside fixed connection of barrel 1 and all the time with 1 inner wall of barrel perpendicular, the guide part is connected with one side that the fixed part deviates from barrel 1, the guide part is to 4 direction slopes of kiln head, and inclination is less than 1 inclination of barrel. The barrel 1 is obliquely arranged to ensure that the material moves towards the kiln head 4 direction every time the material rotates for one circle, the maximum angle formed by the free inclined plane of the material accumulation layer and the horizontal plane is the repose angle of the material, the material is upwards driven by the barrel 1 under the action of friction force, when the angle between the material on the surface layer and the horizontal direction is equal to the repose angle of the material, the material falls down and moves for a certain distance, the inclination angle of the guide part is smaller than the inclination angle of the barrel 1, so that the moving distance of the material in the decomposition zone is smaller than the distance in normal falling every time under the guide action of the guide part, the moving speed of the material in the decomposition zone is effectively reduced, and the calcium carbonate; because the temperature is high in the barrel 1, the connection position of fixed part is easily destroyed by high temperature, consequently with fixed part direct and barrel 1 fixed connection, the connection position under the protection of resistant firebrick inside lining 2 not with the inside high temperature direct contact of barrel 1, reinforcing spiral fender piece 5's fastness and life.

When the utility model is used, cement enters the rotary kiln from the kiln tail 3, the rotary kiln rotates to drive materials to ascend along the cylinder wall by means of friction force, and the materials fall off when the angle between the inclined plane of the materials and the horizontal direction is larger than the angle of repose of the materials, and the materials cannot fall off at the original position because the cylinder body 1 inclines, so that the materials move, and after the materials enter a decomposition belt, the moving speed depends on the spiral material blocking piece 5, so that the moving distance of the materials in the single rotation of the rotary kiln is smaller than the falling distance when the materials do not have the spiral material blocking piece 5; high temperature in the rotary kiln is blockked by end cover 8 can not with 6 direct contact of backplate, protection backplate 6 can not destroyed by high temperature, further protect the barrel 1 of kiln head 4 not the fracture, the life of kiln has been improved, only change end cover 8 when end cover 8 damages, reduce the manpower and materials of changing 4 barrels of kiln head 1 and backplate 6, change 6 expenses that need ten thousand yuan of backplate, the output that the unit time of shutting down reduces is different according to the daily output of rotary kiln, the probability of shutting down has been reduced in the establishment of end cover 8, the rotary kiln output has been improved.

The above-mentioned embodiments are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design concept of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A high-efficiency cement clinker firing rotary kiln comprises a cylinder body (1), a refractory brick lining (2) is covered on the inner wall of the cylinder body (1), the cylinder body (1) is inclined, a kiln tail (3) is arranged at the high end, a kiln head (4) is arranged at the low end, it is characterized in that a spiral material blocking piece (5) is fixedly arranged in the cylinder body (1), a hollow protective plate (6) is arranged at the end part of the kiln head (4), a plate spring (7) is also fixedly arranged outside the kiln head (4), the plate spring (7) is positioned in the protective plate (6), two ends of the plate spring (7) are curled in the direction away from the cylinder body (1), the end part of the kiln head (4) is provided with an end cover (8), the end cover (8) is of an L-shaped structure consisting of an inner cylinder (81) and an outer edge (82), one side, far away from the outer edge (82), of the inner cylinder (81) extends into the kiln head (4) and is fixedly connected with a refractory brick lining (2), and the outer edge (82) is fixedly connected with the guard plate (6).

2. The rotary kiln for high-efficiency cement clinker burning according to claim 1, wherein an insulating material (9) is further coated between the cylindrical body (1) and the refractory brick lining (2).

3. The rotary kiln for burning high-efficiency cement clinker as recited in claim 1, wherein the protective plate (6) comprises a first circular plate (61), a second circular plate (62) and a third circular plate (63) with diameters from small to large, wherein the first circular plate (61) and the second circular plate (62) have the same length and are shorter than the third circular plate (63), one end of the first circular plate (61), one end of the second circular plate (62) and one end of the third circular plate (63) are fixedly connected with the same first circular plate (64), the other end of the third circular plate (63) is fixedly connected with a second circular plate (65), the second circular plate (65) is parallel to the first circular plate (64), the end cover (8) is fixedly connected with the first circular plate (64), and the plate spring (7) is located inside the protective plate (6).

4. The rotary kiln for burning cement clinker according to claim 1 or 3, wherein there are at least two of the plate springs (7).

5. The rotary kiln for firing cement clinker as recited in claim 1, wherein said end cap (8) is made of heat-resistant material and is formed by splicing four parts.

6. The rotary kiln for burning cement clinker as recited in claim 1, wherein the spiral blocking piece (5) comprises a fixed part and a guiding part, the fixed part is fixedly connected with the inside of the cylinder (1) and is always vertical to the inner wall of the cylinder (1), the guiding part is connected with one side of the fixed part, which is far away from the cylinder (1), and the guiding part is inclined towards the kiln head (4) and the inclination angle is smaller than that of the cylinder (1).