Flue connector structure of circular cooler

Abstract

The utility model belongs to the technical field of metallurgical equipment refractory materials, and particularly discloses an annular cooler flue connector structure which comprises a flue and a brick body, the brick body is formed by compounding a high-alumina refractory base body and a silicon carbide abrasion-resistant layer and comprises a vertical protection wall and a horizontal extension portion, the vertical protection wall and the horizontal extension portion are integrally formed, and the vertical protection wall is connected with the horizontal extension portion through a connecting piece. The section of the brick body is trapezoidal, heat-resistant steel bolts are fixedly connected to the outer side of the vertical protection wall and fixedly connected with a flue, and a plurality of mouth protection bricks are sequentially installed in the circumferential direction of a flue connector. Three-dimensional coating of the flue is achieved through the L-shaped structure, the maintenance time is shortened through modular installation, and due to the fact that expansion gaps are reserved between the modules, cracking of the flue opening is avoided.

Description

Technical Field

[0001] This utility model relates to the field of refractory materials technology for metallurgical equipment, specifically to an interface structure for a flue gas duct of an annular cooler. Background Technology

[0002] In the metallurgical industry, the refractory and sealing performance of the flue gas interface of annular coolers directly affects equipment operating efficiency and maintenance costs. Traditional techniques often employ integral casting with castable refractory materials. While these high-alumina or silica castable refractory materials possess a certain degree of high-temperature resistance, their poor thermal shock stability and weak resistance to mechanical vibration make them prone to penetrating cracks under frequent temperature fluctuations and equipment vibrations, leading to seal failure. Furthermore, the continuous scouring by high-speed, dust-laden flue gas accelerates material wear, resulting in a service life generally less than 12 months. In addition, existing castable refractory materials have significantly different coefficients of thermal expansion compared to the metal flue gas, making the interface prone to peeling and cracking due to mismatched thermal expansion. This results in high maintenance frequency and long maintenance time for integral casting, significantly increasing production costs.

[0003] Patent CN117656239A discloses a flue casting mold and a flue casting method. The flue casting mold includes a flue body mold with an outer wall that mimics the inner wall of the flue body. The flue body mold is positioned after the flue body, forming a first casting cavity between the outer wall of the mold and the inner wall of the flue body. A first support member is also included to support the flue body mold and the flue body, with the surface dimension of the first support member in contact with the flue body larger than the inner diameter of the flue body. The flue casting mold provided by this invention eliminates the need for manual entry into the flue for casting, making it suitable for rapid casting of refractory linings in narrow flues, reducing construction difficulty, and improving casting efficiency. Furthermore, it has been verified that the most advantageous effect of using this flue casting mold is a reduction in mold costs of over 80%.

[0004] However, the above scheme uses cast-in-place flue openings. Due to the significant difference in thermal expansion coefficient between the cast-in-place body and the metal flue, the interface is prone to peeling and cracking due to the incoordination of thermal expansion. Utility Model Content

[0005] The purpose of this utility model is to provide a flue gas interface structure for an annular cooler to solve the problems of easy cracking of the flue gas interface and long maintenance time of the cast-in-place structure.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: a flue gas interface structure for an annular cooler, comprising a ring formed by splicing several bricks, wherein each brick includes a vertical protective wall and a horizontal extension, the vertical protective wall and the horizontal extension are integrally formed, both the vertical protective wall and the horizontal extension are composed of a high-alumina refractory matrix, the high-alumina refractory matrix is ​​covered with a silicon carbide wear-resistant layer, heat-resistant steel bolts are fixedly connected to the outer side of the vertical protective wall, the projection surface of the brick on the side of the heat-resistant steel bolt is trapezoidal, the heat-resistant steel bolt is fixedly connected to the flue, and several of the bricks are installed sequentially along the circumference of the flue interface.

[0007] The principle and beneficial effects of this utility model are as follows: the vertical wall and horizontal extension form an L-shaped brick body, and the L-shaped structure achieves three-dimensional coverage of the flue. The high-alumina material has a high melting point and a low coefficient of thermal expansion, maintaining structural stability at high temperatures and resisting thermal stress cracking. Silicon carbide has high hardness and excellent wear resistance, which can resist the erosion and wear of high-speed flue gas. Modular installation shortens maintenance time.

[0008] Option 2, a preferred embodiment of the basic option, involves providing a flow guide groove on the inner side of the vertical retaining wall. Several flow guide grooves form an array to guide the flow direction of the flue gas and reduce direct scouring.

[0009] Option 3, a preferred embodiment of the basic option, features a shear-resistant tenon at the bottom of the brick. The bottom of the brick expands due to heat, but the top material is fixed and constrained, limiting the expansion tendency of the bottom by the "drag" effect from the top. The larger expansion at the bottom and the smaller expansion at the top creates a displacement difference between different layers within the brick. This displacement difference generates shear stress (a force parallel to the material's cross-section) within the material, attempting to resist deformation. The bottom of the brick is designed to be raised to resist the shear force under thermal expansion.

[0010] Option 4, a preferred option of the basic design, involves a silicon carbide wear-resistant layer whose thickness gradually increases from the top of the vertical protective wall to the bottom of the horizontal extension. This progressively thinner design balances wear resistance and thermal stress, reducing interlayer delamination caused by differences in thermal expansion.

[0011] Option 5, a preferred option of the basic scheme, involves filling the gaps between adjacent bricks with a high-temperature adhesive. A thermal expansion allowance is provided between adjacent bricks to prevent deformation under high temperatures. Filling the gaps between modules with the high-temperature adhesive enhances the sealing and vibration resistance of the connection between modules, preventing loosening and failure under high temperatures.

[0012] Option six, a preferred embodiment of the basic option, involves a 125-135° transition arc between the vertical retaining wall and the horizontal extension. This transition arc disperses stress, preventing stress concentration at right-angle joints. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of the flue gas interface of a ring cooler according to the present invention;

[0014] Figure 2 This is a schematic diagram of the brick structure of the flue gas duct interface structure of a ring cooler according to this utility model;

[0015] Figure 3 This is a left view of the brick body of the flue gas duct interface structure of an annular cooler according to this utility model;

[0016] Figure 4 This is an installation diagram of a flue gas duct interface structure for an annular cooler according to this utility model. Detailed Implementation

[0017] The present invention will be further described in detail below through specific embodiments:

[0018] The reference numerals in the accompanying drawings include 1-flue, 2-brick body, 3-vertical wall lining, 4-horizontal extension, 5-heat resistant steel bolt, 6-guide channel, 7-shear tenon, and 8-annular cooler.

[0019] Example

[0020] like Figures 1 to 4 As shown: A flue gas duct interface structure for an annular cooler includes a brick body 2. The brick body 2 includes a vertical retaining wall 3 and a horizontal extension 4. The vertical retaining wall 3 and the horizontal extension 4 are integrally formed. The vertical retaining wall 3 and the horizontal extension 4 are composed of a high-alumina refractory matrix and a silicon carbide wear-resistant layer. The high-alumina refractory matrix has an Al2O3 content ≥75%, and the silicon carbide wear-resistant layer has a SiC content ≥40%. The silicon carbide wear-resistant layer has a gradient distribution from the top of the vertical retaining wall 3 to the bottom surface of the horizontal extension 4, with a thickness of... The vertical wall 3 gradually decreases from top to bottom, forming a 125-135° transition arc between the vertical wall 3 and the horizontal extension 4. The outer side of the vertical wall 3 is fixedly connected with heat-resistant steel bolts 5. The projection surface of the brick 2 on the side of the heat-resistant steel bolts 5 is trapezoidal. The inner side of the vertical wall 3 is provided with a guide groove 6. The bottom of the brick 2 is provided with a shear-resistant tenon 7. The heat-resistant steel bolts 5 are fixedly connected to the flue 1. Several protective bricks are installed sequentially along the circumference of the flue 1 interface. The gaps between the bricks 2 are filled with high-temperature adhesive.

[0021] The implementation method of this embodiment is as follows: The surface of the interface of flue 1 is cleaned, and a phosphate-based high-temperature adhesive is applied to form a 0.2mm thick adhesive layer. Bricks 2 are then assembled sequentially along the circumference of flue 1. Since the cross-section of brick 2 is trapezoidal, a 2.5mm expansion gap is reserved between adjacent bricks 2. High-temperature adhesive is injected into the expansion gap to enhance the sealing and vibration resistance of the connection between modules, preventing loosening and failure at high temperatures. The L-shaped structure achieves three-dimensional coverage of flue 1. The high-alumina material has a high melting point and low coefficient of thermal expansion, maintaining structural stability at high temperatures and resisting thermal stress cracking. Silicon carbide has high hardness and excellent wear resistance, resisting the erosion and wear of high-speed flue gas. Stress is dispersed through transition arcs, avoiding stress concentration at right-angle connections.

[0022] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A flue gas duct interface structure for an annular cooler, characterized in that, The ring consists of several bricks (2) joined together. Each brick (2) includes a vertical retaining wall (3) and a horizontal extension (4). The vertical retaining wall (3) and the horizontal extension (4) are integrally formed. Both the vertical retaining wall (3) and the horizontal extension (4) are made of a high-alumina refractory matrix. The surface of the high-alumina refractory matrix is ​​covered with a silicon carbide wear-resistant layer. Heat-resistant steel bolts (5) are fixedly connected to the outside of the vertical retaining wall (3). The projection surface of the brick (2) on the side of the heat-resistant steel bolt (5) is trapezoidal. The heat-resistant steel bolt (5) is fixedly connected to the flue (1). Several bricks (2) are installed sequentially along the circumferential direction of the flue (1) interface.

2. The annular cooler flue gas duct interface structure according to claim 1, characterized in that... The vertical retaining wall (3) has a flow guide groove (6) on its inner side.

3. The annular cooler flue gas duct interface structure according to claim 1, characterized in that, The bottom of the brick body (2) is provided with a shear-resistant tenon (7).

4. The annular cooler flue gas duct interface structure according to claim 1, characterized in that... The thickness of the silicon carbide wear-resistant layer gradually increases from the top of the vertical protective wall (3) to the bottom of the horizontal extension (4).

5. The annular cooler flue gas duct interface structure according to claim 1, characterized in that, A high-temperature adhesive is filled between adjacent bricks (2).

6. The annular cooler flue gas duct interface structure according to claim 1, characterized in that, A 125-135° transition arc is formed between the vertical retaining wall (3) and the horizontal extension (4).

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