A reinforced inner cylinder for cement preheater

Abstract

The present invention discloses a reinforced inner cylinder for a cement preheater, belonging to the technical field of cement production equipment. The present invention comprises a reinforcing plate, an outer layer castable and an inner layer castable, wherein the outer layer castable and the inner layer castable are respectively arranged on both sides of the reinforcing plate; the reinforcing plate is provided with a plurality of through holes, and the through holes penetrate both sides of the reinforcing plate. The outer layer castable and the inner layer castable of the present invention are connected through the through holes, so that the outer layer castable and the inner layer castable are integrated, thereby improving the bonding strength of the outer layer castable and the inner layer castable on the reinforcing plate.

Description

Technical Field

[0001] This invention relates to the field of cement production equipment technology, and more specifically, to a reinforced inner cylinder for a cement preheater. Background Technology

[0002] In the cement production industry, the preheater inner cylinder is an important piece of equipment to ensure the normal production of cement. In the preheater of the rotary kiln for cement production, the preheater needs to provide multi-stage co-current heat exchange between the raw meal powder and the hot air at the kiln tail so that the powder can finally enter the rotary kiln for calcination. The inner cylinder can provide sufficient dispersion time for the raw meal powder. During this process, the working environment of the inner cylinder is very harsh, and it faces high temperature, alkali vapor, sulfur vapor and high-speed scouring of powder.

[0003] Currently, most existing preheater inner cylinders are of the plate-type design, with the plates primarily made of cast heat-resistant steel. Due to the harsh environment inside the preheater—high temperatures, alkaline vapors, sulfur vapors, and high-speed erosion from powdered materials—the product's lifespan is significantly shortened, especially for fourth and fifth-stage preheaters, where the plate lifespan is only about one year. To address the shortcomings of current plate-type preheater inner cylinders, the inventors previously developed an integrated preheater inner cylinder. This cylinder includes a reinforcing plate in the middle layer, with refractory material layers on both sides of the reinforcing plate. After use, it was found that compared to traditional plate-type preheater inner cylinders, the integrated preheater inner cylinder has a significantly longer service life, possessing not only better strength but also stronger resistance to physical and chemical corrosion.

[0004] However, the inventors discovered that the refractory material would fall off after prolonged use of the preheater inner cylinder. Therefore, solving the problem of the bonding between the refractory material and the reinforcing plate is of great significance for further improving the service life of the preheater inner cylinder. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve

[0006] The purpose of this invention is to address the problem of low structural strength of the inner cylinder of cement preheaters in the prior art by providing a reinforced inner cylinder for cement preheaters. By opening through holes in the reinforcing plate of the inner cylinder, the refractory materials on both sides of the reinforcing plate are bonded together, thereby improving the bonding strength between the refractory materials and the reinforcing plate.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0009] The present invention provides a reinforced inner cylinder for a cement preheater, comprising a reinforcing plate, an outer layer of castable refractory and an inner layer of castable refractory, wherein the outer layer of castable refractory and the inner layer of castable refractory are respectively disposed on both sides of the reinforcing plate; the reinforcing plate is provided with a plurality of through holes, the through holes penetrating both sides of the reinforcing plate, and the outer layer of castable refractory and the inner layer of castable refractory are connected through the through holes.

[0010] Preferably, the through hole is an elongated hole.

[0011] Preferably, the end of the elongated through hole is arc-shaped.

[0012] Preferably, the through holes are evenly distributed on the reinforcing plate.

[0013] Preferably, along the circumferential direction of the inner cylinder, the through holes are arranged in rows on the reinforcing plate, with equal distances between adjacent rows and equal distances between adjacent through holes in the same row.

[0014] Preferably, the through holes in adjacent columns are arranged in an alternating pattern.

[0015] Preferably, the reinforcing plate is provided with fastener mounting holes, and fasteners are installed in the fastener mounting holes. The fasteners extend from the reinforcing plate to both sides of the reinforcing plate and are embedded in the outer layer castable and the inner layer castable.

[0016] Preferably, the fixing member is a cross-shaped fixing nail, and the intersection of the fixing nails is fixed in the mounting hole of the fixing member.

[0017] Preferably, the fixing member mounting hole includes a first fixing member mounting hole and a second fixing member mounting hole, a first fixing member is installed in the first fixing member mounting hole, and a second fixing member is installed in the second fixing member mounting hole, with the fixing directions of the first fixing member and the second fixing member being perpendicular.

[0018] Preferably, the height of the reinforcing plate is 1000-4000cm, the length of the through hole is 50-180cm, and the spacing between adjacent through holes is 133-216cm.

[0019] 3. Beneficial effects

[0020] Compared with existing known technologies, the technical solution provided by this invention has the following significant advantages:

[0021] (1) A reinforced inner cylinder for a cement preheater according to the present invention includes a reinforcing plate, an outer layer of castable refractory and an inner layer of castable refractory, wherein the outer layer of castable refractory and the inner layer of castable refractory are respectively disposed on both sides of the reinforcing plate; the reinforcing plate is provided with a plurality of through holes, the through holes penetrating both sides of the reinforcing plate, and the outer layer of castable refractory and the inner layer of castable refractory are connected through the through holes, so that the outer layer of castable refractory and the inner layer of castable refractory become one, thereby improving the bonding strength of the outer layer of castable refractory and the inner layer of castable refractory on the reinforcing plate.

[0022] (2) A reinforced inner cylinder for a cement preheater according to the present invention has a through hole provided on the reinforcing plate, which is a long strip-shaped hole with an arc-shaped end. The shape of the through hole is conducive to the connection between the outer layer of castable material and the inner layer of castable material during the casting process, thereby forming an integral whole. Compared with other shapes, it can effectively reduce the impact of drilling on the strength of the reinforcing plate.

[0023] (3) In the present invention, a reinforced inner cylinder for a cement preheater has through holes that are evenly distributed in rows on the reinforcing plate and the through holes in adjacent rows are staggered. In order to ensure that the castable material on both sides of the reinforcing plate can be effectively bonded, the reasonable arrangement of the through holes can avoid the loss of strength after the reinforcing plate is drilled.

[0024] (4) A reinforced inner cylinder for a cement preheater of the present invention has a fixing mounting hole provided on the reinforcing plate. A fixing component is installed in the fixing mounting hole. The fixing component extends from the reinforcing plate to both sides of the reinforcing plate. The fixing component is embedded in the outer layer castable and the inner layer castable. This not only strengthens the bonding effect between the single-sided castable and the reinforcing plate, but also improves the bonding strength between the outer layer castable and the inner layer castable, and greatly improves the overall strength of the inner cylinder. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a reinforced inner cylinder structure for a cement preheater according to the present invention;

[0026] Figure 2 This is a cross-sectional view of a reinforced inner cylinder for a cement preheater according to the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of the through hole on the reinforced inner cylinder of a cement preheater according to the present invention;

[0028] Figure 4 This is a schematic diagram of the distribution of through holes on a reinforced inner cylinder for a cement preheater according to the present invention;

[0029] Figure 5 This is a schematic diagram showing the distribution of fixing components on the cross-section of a reinforced inner cylinder for a cement preheater according to the present invention.

[0030] Explanation of the labels in the diagram:

[0031] 101. Outer layer castable; 102. Inner layer castable; 110. Reinforcing plate; 120. Through hole; 121. End of slot; 122. Shrinkage section; 131. First fastener mounting hole; 132. Second fastener mounting hole; 141. First fastener; 142. Second fastener. Detailed Implementation

[0032] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0033] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation. In addition, the various embodiments of the invention are not independent but can be combined.

[0034] Example 1

[0035] like Figures 1-4 As shown, a reinforced inner cylinder for a cement preheater according to this embodiment includes a reinforcing plate 110, an outer layer castable refractory 101, and an inner layer castable refractory 102, with the outer layer castable refractory 101 and the inner layer castable refractory 102 respectively disposed on both sides of the reinforcing plate 110. The reinforcing plate 110 mainly serves to maintain the overall strength of the inner cylinder structure, thereby better preserving the overall shape of the inner cylinder. In this embodiment, the reinforcing plate 110 is a steel plate, but the material of the reinforcing plate 110 is not limited to steel plate; any material that can provide good internal shape support is acceptable. The outer layer castable refractory 101 and the inner layer castable refractory 102 are generally refractory materials, and they are responsible for direct contact with the hot air inside the cement preheater.

[0036] The reinforcing plate 110 is provided with multiple through holes 120, which penetrate both sides of the reinforcing plate 110. During the manufacturing process of the inner cylinder, the outer layer castable 101 and the inner layer castable 102 are respectively cast onto the outer and inner layers of the reinforcing plate 110. Due to the through holes 120 on the reinforcing plate 110, the outer layer castable 101 and the inner layer castable 102 are connected within the through holes 120 during the casting process. After the outer layer castable 101 and the inner layer castable 102 are solidified, they can form a whole through the connected part within the through holes 120. At this time, it is difficult for the outer layer castable 101 or the inner layer castable 102 on one side of the reinforcing plate 110 to fall off, which greatly improves the overall strength of the inner cylinder.

[0037] It should be noted that the "through hole 120" described in this embodiment does not necessarily mean that the through portion is a small circular or square hole. In this embodiment, the through hole 120 is an elongated hole. During the casting process, making the through hole 120 elongated facilitates the entry of the casting material into the through hole 120, ensuring that there is a sufficient amount of casting material in the through hole 120 to bond the outer layer casting material 101 and the inner layer casting material 102. Furthermore, the elongated through hole 120 has a larger overall span of connection area, which helps to improve the strength of the bond between the outer layer casting material 101 and the inner layer casting material 102.

[0038] In addition, the end 121 of the elongated through hole 120 in this embodiment is arc-shaped. Setting the end to be arc-shaped can avoid the occurrence of large turning angles. On the one hand, it is beneficial to minimize the reduction in strength of the reinforcing plate 110 due to the opening. On the other hand, it can avoid the occurrence of casting dead corners in the through hole 120, which would make it difficult for the casting material to be effectively filled.

[0039] In this embodiment, as shown... Figure 3 As shown, a contraction section 122 is provided at the transition between the end of the through hole 120 and the side of the reinforcing plate 110. The cross-sectional area of ​​the contraction section 122 gradually decreases along the direction from the side of the reinforcing plate 110 to the interior of the through hole 120. This contraction section 122 guides the castable refractory material into the through hole 120 during the casting process. Furthermore, it enhances the connection strength between the castable refractory material in the through hole 120 and the outer and inner layers of castable refractory 101, further improving the overall strength.

[0040] It is worth noting that the through holes 120 are evenly distributed on the reinforcing plate 110. The even distribution of the through holes 120 on the reinforcing plate 110 is beneficial to ensuring the effective bonding of the outer layer castable 101 and the inner layer castable 102, and also makes the overall strength of the reinforcing plate 110 uniform, avoiding deformation during use.

[0041] In this embodiment, the through holes 120 are arranged in rows on the reinforcing plate 110 along the circumferential direction of the inner cylinder. The distance between adjacent rows is equal, and the distance between adjacent through holes 120 in the same row is equal. Furthermore, the through holes 120 in adjacent rows are staggered, which can minimize the strength loss after drilling. It should be noted that the width of the reinforcing plate 110 is W, the distance between adjacent rows of through holes 120 is d, d = W / k, where 2.5 ≤ k ≤ 3.5, and in this embodiment k = 3. The width of W is 400-650 cm, the row spacing of adjacent rows of through holes 120 is 133-216 cm, and in this embodiment W is 510 cm, and d = 170 cm.

[0042] In this embodiment, the height of the reinforcing plate 110 is 1000–4000 cm, and the length of the through hole 120 is 50–180 cm. In this embodiment, the height of the reinforcing plate 110 is 3000 cm, and the length of the through hole 120 is 120 cm. The inventors have found that through the above arrangement, the outer layer castable 101 and the inner layer castable 102 have good bonding ability, and the reinforcing plate 110 as a whole has good strength.

[0043] The reinforcing plate 110 is provided with mounting holes for fasteners, which extend through both sides of the reinforcing plate 110. Fasteners are installed in the mounting holes and extend from the reinforcing plate 110 to both sides, embedding themselves within the outer layer castable 101 and the inner layer castable 102. The function of the fasteners is to further improve the bonding strength between the reinforcing plate 110 and the outer and inner layers of castable 101 and castable 102 through their fixing effect.

[0044] In this embodiment, the fixing element is a cross-arranged fixing nail, such as... Figure 5 As shown, the intersection of the fixing nails is fixed in the mounting hole of the fastener. In this embodiment, the intersection of the fixing nails is fixed in the mounting hole of the fastener by welding. The fixing nails, on the one hand, pull the outer layer casting material 101 and the inner layer casting material 102 tightly and fix them to the side of the reinforcing plate 110 through traction force, making it difficult for the outer layer casting material 101 and the inner layer casting material 102 to fall off the surface of the reinforcing plate 110. On the other hand, the setting of the fixing nails increases the friction of the surface of the reinforcing plate 110, making it difficult for the outer layer casting material 101 and the inner layer casting material 102 to slip off along the surface direction of the reinforcing plate 110, thereby further improving the bonding ability of the outer layer casting material 101 and the inner layer casting material 102 on the surface of the reinforcing plate 110. In addition, the fixing nails also directly connect the outer layer casting material 101 and the inner layer casting material 102 together, which is beneficial to improving the bonding strength of the outer layer casting material 101 and the inner layer casting material 102.

[0045] The fastener mounting holes include a first fastener mounting hole 131 and a second fastener mounting hole 132. The first fastener mounting holes 131 and 132 are evenly and alternately arranged on the surface of the reinforcing plate 110. A first fastener 141 is installed in the first fastener mounting hole 131, and a second fastener 142 is installed in the second fastener mounting hole 132. The fixing directions of the first fastener 141 and the second fastener 142 are perpendicular. In this embodiment, both the first fastener 141 and the second fastener 142 are intersecting fasteners, but their intersecting directions are perpendicular to each other. This arrangement allows the fasteners to fix the castable material in different directions, further improving the bonding effect.

[0046] The present invention has been described in detail above with reference to specific exemplary embodiments. However, it should be understood that various modifications and variations can be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings should be considered illustrative only and not restrictive, and any such modifications and variations shall fall within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the current state of development and significance of the technology and is not intended to limit the present invention or the scope of application of the present application.

[0047] More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adaptive changes, and / or substitutions, as would be apparent to those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly as used in the language of the claims and are not limited to the examples described in the foregoing detailed description or during the implementation of this application, which should be considered non-exclusive. Any step listed in any method or process claim may be performed in any order and is not limited to the order set forth in the claims. Therefore, the scope of the invention should be determined solely by the appended claims and their legal equivalents, and not by the description and examples given above.

Claims

1. A reinforced inner cylinder for cement preheater, characterized in that: The invention comprises a reinforcing plate (110), an outer layer castable (101) and an inner layer castable (102), wherein the outer layer castable (101) and the inner layer castable (102) are respectively arranged on both sides of the reinforcing plate (110); a plurality of through holes (120) are arranged on the reinforcing plate (110), and the through holes (120) penetrate both sides of the reinforcing plate (110); the outer layer castable (101) and the inner layer castable (102) are connected via the through holes (120); the through holes (120) are long strip-shaped holes; the strip hole ends (121) of the long strip-shaped through holes (120) are arc-shaped; and adjacent rows of through holes (120) are arranged in a staggered manner; A contraction section (122) is provided at the transition between the end of the through hole (120) and the side of the reinforcing plate (110), and the cross-sectional area of ​​the contraction section (122) gradually decreases along the direction from the side of the reinforcing plate (110) to the inside of the through hole (120); The width of the reinforcing plate (110) is W, and the distance between adjacent rows of through holes (120) is d, where d=W / k, 2.5≤k≤3.5; A fixing member installation hole is provided on the reinforcing plate (110), a fixing member is installed in the fixing member installation hole, the fixing member extends from the reinforcing plate (110) to both sides of the reinforcing plate (110), and the fixing member is embedded in the outer layer casting material (101) and the inner layer casting material (102); The fixing member is a cross-arranged fixing nail, and the intersection of the fixing nails is fixed in the fixing member installation hole; The fixing member installation hole comprises a first fixing member installation hole (131) and a second fixing member installation hole (132); a first fixing member (141) is installed in the first fixing member installation hole (131); a second fixing member (142) is installed in the second fixing member installation hole (132); and fixing directions of the first fixing member (141) and the second fixing member (142) are perpendicular.

2. The reinforced inner cylinder for cement preheater according to claim 1, characterized in that: The through holes (120) are evenly distributed on the reinforcing plate (110).

3. The reinforced inner cylinder for cement preheater according to claim 1, characterized in that: Along the circumferential direction of the inner cylinder, the through holes (120) are arranged in columns on the reinforcing plate (110), with the distances between adjacent columns being equal, and the distances between adjacent through holes (120) in the same column being equal.

4. The reinforced inner cylinder for cement preheater according to any one of claims 1 to 3, characterized in that: The height of the reinforcing plate (110) is 1000-4000 cm, the length of the through holes (120) is 50-180 cm, and the row spacing between adjacent rows of through holes (120) is 133-216 cm.

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