A masonry structure and a masonry method thereof

Abstract

This application belongs to the technical field of lime kiln masonry structures, specifically relating to a masonry structure and its construction method. The masonry structure is applied to the annular channel of a double-chamber kiln, the annular channel being defined by an inner cylinder and a kiln shell. The masonry structure includes a first precast brick with a first groove on one side. A second precast brick has a second groove, the opening of which is opposite to the opening of the first groove. The second groove and the first groove together define a conical hole for surrounding the steel cylinder. A cast-in-place layer is formed within the conical hole and located outside the steel cylinder. In this application, by combining the first and second precast bricks around the perimeter of the steel cylinder, a cast-in-place layer is formed between the conical hole and the steel cylinder, achieving high overall quality and high structural strength of the masonry at the top of the annular channel of the double-chamber kiln.

Description

Technical Field

[0001] This application belongs to the technical field of lime kiln masonry structures, specifically relating to a masonry structure and its construction method. Background Technology

[0002] The double-chamber kiln is one of the mainstream thermal equipment for lime calcination today. It can produce high-quality, low-consumption active lime and is widely used in the metallurgical lime industry. A double-chamber kiln is a vertical kiln consisting of two kiln cylinders connected at a low to medium position. At the bottom of the calcination zone of each kiln chamber, there is an annular channel surrounding the two chambers and a direct connecting channel between them. During production, the flue gas enters the annular channel of the other chamber through the annular channel of the first chamber. Flame-dispensing holes are evenly distributed in the annular channels of the double-chamber kiln. The function of these holes is to check the condition of the flue gas annular channels and to serve as cleaning ports for periodic cleaning. The working environment at the flame-dispensing holes during production is: the temperature of the gas containing lime dust is around 1000℃, and the pressure is around 25 kPa. To protect the steel cylinder device of the fire-dispensing hole, refractory bricks and other materials are built around the steel cylinder of the fire-dispensing hole during major repairs or new kilns. The materials are required to have good integrity, thermal shock resistance and sealing performance. Otherwise, the hot air flow may cause thermal burn damage to the steel cylinder device of the fire-dispensing hole, resulting in the escape or leakage of hot air. This can cause the platform steel plate at the fire-dispensing hole to be too hot, forcing the kiln to be shut down for major repairs.

[0003] In related technologies, the top masonry of the annular channel in a double-chamber kiln is constructed using a combination of various irregularly shaped bricks. The large variety and quantity of these bricks result in poor overall masonry integrity and low strength. Specifically, combined with... Figure 8 As shown, taking eight bricks (KU3A, KU4A, KU1AY, KU2AY, KUN8, KUN9, KUN7Y, and KUN6Y) as an example, the masonry construction is explained. The masonry technique for the top of the circular passage is as follows: it is constructed using eight bricks (KU3A, KU4A, KU1AY, KU2AY, KUN8, KUN9, KUN7Y, and KUN6Y), arranged in two alternating layers. One layer consists of four irregularly shaped bricks (KU3A, KUN8, KUN6Y, and KU2AY); the other layer consists of four irregularly shaped bricks (KU4A, KUN9, KUN7Y, and KU1AY). (Fire hole steel cylinder...) Figure 8 The arrow 'p' in the diagram indicates the masonry technique used at the steel cylinder: irregularly shaped bricks of type KUN6Y, KUN7Y, KUN8, and KUN9 are cut on-site and used to surround the steel cylinder. This masonry technique involves each layer of bricks of four different types. Due to the large variety and quantity of irregularly shaped bricks, it results in poor overall integrity and low strength, and also causes unevenness between the left and right sides of the same layer. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the related art.

[0005] Therefore, the first aspect of this application provides a masonry structure.

[0006] The second aspect of this application provides a method for constructing masonry structures.

[0007] According to a first aspect of the embodiments of this application, a masonry structure is proposed for use in an annular channel of a double-chamber kiln, the annular channel being defined by an inner cylinder wall and a kiln shell wall. The masonry structure includes: a first precast brick having a first groove on one side; a second precast brick having a second groove, the opening of the second groove being opposite to the opening of the first groove, the second groove and the first groove jointly defining a conical hole for surrounding a steel cylinder; and a casting layer formed within the conical hole and located outside the steel cylinder.

[0008] In one possible implementation, the masonry structure further includes: a third precast brick, which is disposed on the side of the first precast brick opposite to the second precast brick or on the side of the second precast brick opposite to the first precast brick; the length directions of the first precast brick, the second precast brick and the third precast brick extend radially along the annular channel.

[0009] In one possible implementation, at least one first precast brick and at least one corresponding second precast brick constitute a masonry unit; a plurality of masonry units are arranged at circumferential intervals along the annular channel, and the third precast brick is arranged between adjacent masonry units.

[0010] In one possible implementation, the masonry structure is disposed within the annular channel, and the bottom of the first precast brick and the second precast brick near the inner cylinder wall are respectively provided with chamfered corners.

[0011] In one possible implementation, the masonry structure further includes: fiber cotton disposed on the side of the first precast brick and the second precast brick that are in contact with the inner cylinder wall, for absorbing thermal expansion.

[0012] In one possible implementation, the distance between the upper edge of the first groove and the outer wall of the steel cylinder is greater than the distance between the lower edge of the first groove and the outer wall of the steel cylinder; the distance between the upper edge of the second groove and the outer wall of the steel cylinder is greater than the distance between the lower edge of the second groove and the outer wall of the steel cylinder.

[0013] In one possible implementation, the distance between the upper edge of the first groove and the outer wall of the steel cylinder is 75mm to 80mm, and the distance between the upper edge of the second groove and the outer wall of the steel cylinder is 75mm to 80mm.

[0014] According to a second aspect of the embodiments of this application, a method for constructing a masonry structure is proposed, the method comprising the following steps: placing a first precast brick on one side of a steel cylinder, and having a first groove of the first precast brick surround a portion of the steel cylinder; placing a second precast brick on the other side of the steel cylinder, and having a second groove of the second precast brick and the first groove together define a conical hole surrounding the steel cylinder; filling the space between the first groove, the second groove and the outer wall of the steel cylinder with castable refractory to form a castable layer within the conical hole.

[0015] In one possible implementation, after the step of filling the space between the first groove, the second groove, and the outer wall of the steel cylinder with castable material to form a castable layer in the conical hole, the masonry method further includes: laying a third precast brick on the side of the first precast brick facing away from the second precast brick and on the side of the second precast brick facing away from the first precast brick, respectively.

[0016] In one possible implementation, prior to the step of placing the first precast brick on one side of the steel cylinder and having the first groove of the first precast brick enclose a portion of the area of ​​the steel cylinder, the masonry method further includes: laying fiber cotton on the inner cylinder wall, the fiber cotton being at least located at the position where the inner cylinder wall contacts the first precast brick and the second precast brick.

[0017] The apparatus and method provided in this application can achieve at least the following technical effects: In this application, a masonry structure is applied to the annular channel of a double-chamber kiln. The annular channel is defined by an inner cylinder wall and a kiln shell wall. The masonry structure includes a first precast brick with a first groove on one side. A second precast brick has a second groove, the opening of which is opposite to the opening of the first groove. The second groove and the first groove together define a conical hole for surrounding the steel cylinder. A casting layer is formed inside the conical hole and located outside the steel cylinder, effectively filling the gap between the steel cylinder and the masonry, preventing erosion by high-temperature dusty airflow. The conical hole structure, in conjunction with the casting layer, forms a stable and uniform surrounding structure between the steel cylinder and the masonry, effectively dispersing and releasing thermal stress, improving the overall stability and integrity of the masonry structure under high-temperature fluctuations, thereby enhancing the safety of kiln operation. In this application, by combining the first and second precast bricks around the steel cylinder and forming a casting layer between the conical hole and the steel cylinder, the overall quality of the masonry at the top of the annular channel of the double-chamber kiln is high, the strength of the masonry structure is high, and the horizontal surface of the same channel is relatively flat.

[0018] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 A front view schematic diagram illustrating the relationship between the masonry structure and the steel cylinder arrangement provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of the first precast brick provided in an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the structure of the third precast brick provided in an embodiment of the present disclosure; Figure 4 A top view schematic diagram illustrating the relationship between the masonry structure and the steel cylinder arrangement provided in an embodiment of this disclosure; Figure 5 A schematic diagram of the masonry structure provided in this embodiment of the present disclosure applied to the annular channel of a double-chamber kiln; Figure 6 A flowchart illustrating a method for constructing a masonry structure according to an embodiment of this disclosure; Figure 7 A flowchart illustrating a method for constructing a masonry structure according to another embodiment of this disclosure; Figure 8 This is a top view schematic diagram showing the relationship between the masonry structure and the steel cylinder arrangement in related technologies.

[0020] The reference numerals in the attached figures are as follows: 100: Masonry structure; 101: First precast brick; 102: First groove; 103: Second precast brick; 104: Second groove; 105: Conical hole; 106: Cast-in-place layer; 107: Third precast brick; 108: Fiber cotton; 200: Steel cylinder; 201: Inner cylinder wall; 202: Kiln shell wall. Detailed Implementation

[0021] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0024] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0025] Unless otherwise stated, the term "multiple" means two or more.

[0026] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0027] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0029] Combination Figures 1 to 5As shown, this application provides a masonry structure 100 for an annular channel of a double-chamber kiln, the annular channel being defined by an inner cylinder wall 201 and a kiln shell wall 202. The masonry structure 100 includes a first precast brick 101, a second precast brick 103, and a cast-in-place layer 106. A first groove 102 is provided on one side of the first precast brick 101. A second groove 104 is provided on the second precast brick 103, the opening of which is opposite to the opening of the first groove 102. The second groove 104 and the first groove 102 together define a conical hole 105 for surrounding the steel cylinder 200. The cast-in-place layer 106 is formed within the conical hole 105 and located outside the steel cylinder 200.

[0030] The first precast brick 101 and the second precast brick 103 use large precast components, replacing the traditional method of splicing multiple irregularly shaped bricks. This reduces the number of brick joints, enhances the integrity of the masonry, and makes the masonry flat and solid, achieving integrated masonry assembly. Under the high temperature and high pressure environment inside the kiln, it is firm, reliable, stable, safe, and durable. In related masonry construction schemes, because the masonry assembly uses many bricks, there are many brick joints at the joints. These joints are filled with refractory mortar. During production and operation, under the long-term scouring of high pressure and high temperature airflow, thermal damage is easily generated, causing airflow leakage and poor sealing and heat insulation. The masonry around the steel cylinder of the fire-dispensing hole needs to be manually measured and cut on-site before being built into a circle. The precision of the cutting and the difficulty of building the circle will result in irregular gaps between the bricks and the steel cylinder, and poor tightness of the poured plug. During production, if a brick in the assembly breaks or falls off, especially a processed brick whose surface is thinner, the breakage and detachment can trigger a chain reaction, causing adjacent bricks to fall off and the entire cast-in-place structure to detach, leading to significant quality risks. The first groove 102 and the second groove 104 are positioned opposite each other, forming a conical hole 105 surrounding the steel cylinder 200. After the castable refractory is poured into the hole, a dense casting layer 106 is formed, effectively filling the gap between the steel cylinder 200 and the masonry, preventing erosion from high-temperature, dusty airflow. The conical hole 105 structure, combined with the casting layer 106, creates a stable and uniform surrounding structure between the steel cylinder 200 and the masonry, effectively dispersing and releasing thermal stress. This enhances the overall stability and integrity of the masonry structure 100 under high-temperature fluctuations, thereby improving the safety of kiln operation. By using the first precast brick 101 and the second precast brick 103, the amount of brickwork is greatly reduced. The reduction in the amount of brickwork also greatly reduces the number of brick joints, improving the sealing of the masonry. Masonry does not require on-site measurement and cutting, making construction simple and quick, and improving the quality of masonry.

[0031] In one possible implementation, the first precast brick 101 and the second precast brick 103 are rectangular parallelepipeds in the shape of an isosceles trapezoid, and the first precast brick 101 and the second precast brick 103 are two bricks of the same size and with symmetrical structure.

[0032] In one possible implementation, the radii of the upper edges of the first groove 102 and the second groove 104 are 228 mm, and the radii of the lower edges of the first groove 102 and the second groove 104 are 178 mm, respectively.

[0033] Combination Figure 2 As shown, the side pointed to by arrow g is the top view length of the first precast brick 101, which is 1073mm to 1079mm. The side pointed to by arrow e is the wide side of the first precast brick 101, which is 307mm to 309mm. The side pointed to by arrow f is the narrow side of the first precast brick 101, which is 209mm to 211mm. The height is 300mm. Arrow h is used to indicate the length direction of the first precast brick 101 in top view, and arrow k is used to indicate the width direction of the first precast brick 101. Figure 1 The up and down directions in the diagram can be used to indicate the height direction of the first precast brick 101 and the second precast brick 103.

[0034] Combination Figure 4 As shown, in some embodiments, the masonry structure 100 further includes a third precast brick 107, which is disposed on the side of the first precast brick 101 opposite to the second precast brick 103, or the third precast brick 107 is disposed on the side of the second precast brick 103 opposite to the first precast brick 101. The length directions of the first precast brick 101, the second precast brick 103, and the third precast brick 107 extend radially along the annular channel.

[0035] The third precast brick 107 fills the blank areas on both sides of the first precast brick 101 and the second precast brick 103, achieving complete coverage of the working layer at the top of the annular channel. The brick's length extends radially along the annular channel, allowing it to stretch evenly towards the kiln shell wall 202 when heated, thereby preventing crack formation.

[0036] It should be noted that the radial direction of the annular channel can refer to a straight line from the inner cylinder wall 201 to the kiln shell wall 202 or from the kiln shell wall 202 to the inner cylinder wall 201.

[0037] Combination Figure 3 As shown, arrow b points to the top view length of the third precast brick 107, which is 1073mm to 1079mm. Arrow c points to the wide side of the third precast brick 107, which is 278mm to 230mm. Arrow d points to the narrow side of the third precast brick 107, which is 191mm to 199mm. The height is 295mm to 305mm. Arrow m indicates the length direction of the third precast brick 107 in its top view, and arrow n indicates the width direction of the third precast brick 107. Figure 1 The up and down directions in the diagram can be used to indicate the height direction of the third precast brick 107.

[0038] In one possible implementation, the first precast brick 101, the second precast brick 103, and the third precast brick 107 can be made of high-alumina brick of type HA75. The performance indicators of high-alumina bricks are shown in Table 1. Their chemical composition includes Al2O3 and Fe2O3, where Al2O3 ≥ 75% and Fe2O3 ≤ 1.5%. The compressive strength at room temperature is ≥ 80 N / mm². 2 Apparent porosity ≤20%, bulk density ≥2.6 g / cm³ 3 Load softening temperature ≥1550℃, thermal shock resistance ≥10 cycles (1100℃, water cooling).

[0039] It should be noted that room temperature compressive strength refers to the pressure that a brick can withstand under normal temperature conditions. Apparent porosity refers to the volume percentage of open pores within the brick. Bulk density refers to the density of the brick. Load softening temperature refers to the temperature at which the sample begins to deform under a specific pressure (usually 0.2 MPa). Thermal shock resistance refers to the number of times a brick is heated to 1100℃ and then suddenly immersed in cold water for cooling, repeated until the brick cracks.

[0040] The bricks are made of high-alumina material, which has excellent thermal shock resistance and is well adapted to the temperature changes during kiln start-up and shutdown. In particular, its high compressive strength and high load softening temperature make the masonry suitable for high-temperature use, and it has unique advantages in high-temperature resistance, thermal shock resistance, and erosion resistance.

[0041] Table 1 Performance Indicators of High Alumina Bricks (Model: HA75)

[0042] Combination Figure 4 As shown, in some embodiments, at least one first precast brick 101 and at least one corresponding second precast brick 103 constitute a masonry unit. Multiple masonry units are spaced apart circumferentially along the annular channel, and a third precast brick 107 is disposed between adjacent masonry units.

[0043] By inserting a third precast brick 107 between the masonry units as a buffer zone, the masonry units are separated, so that each masonry unit has independent space to expand to both sides, which can release circumferential thermal stress.

[0044] It should be noted that a masonry unit and two third precast bricks 107 can constitute a masonry group, wherein the two third precast bricks 107 are located on both sides of the masonry unit.

[0045] In one possible implementation, an expansion joint with a width of 2mm to 3mm is reserved between adjacent masonry groups, and 2mm fiber paper is used as a liner to ensure expansion buffering.

[0046] Combination Figure 1 and Figure 5As shown, in some embodiments, the masonry structure 100 is disposed in an annular channel, and the bottom of the first precast brick 101 and the second precast brick 103 near the inner cylinder wall 201 are respectively provided with chamfers.

[0047] By providing chamfers at the bottom of the first precast brick 101 and the second precast brick 103 on the side near the inner cylinder wall 201, the fitting accuracy between the first precast brick 101 and the second precast brick 103 and the inner cylinder wall 201 can be improved, and a small amount of expansion space between bricks can also be reserved.

[0048] In one possible implementation, the bottom of the third precast brick 107 near the inner cylinder wall 201 is chamfered.

[0049] In one possible implementation, the chamfered side length can be 25mm and the angle can be 45°.

[0050] It should be noted that, Figure 1 and Figure 5 Arrow 'a' in the diagram is used to indicate the chamfer of the first precast brick 101, the second precast brick 103, and the third precast brick 107.

[0051] Combination Figure 5 As shown, in some embodiments, the masonry structure 100 further includes fiber cotton 108, which is disposed on the side of the first precast brick 101 and the second precast brick 103 respectively in contact with the inner cylinder wall 201, for absorbing thermal expansion.

[0052] Fiber cotton 108 has excellent compressibility. When the precast bricks expand due to heat and extend towards the inner cylinder wall 201, the fiber cotton 108 is compressed, absorbing this expansion displacement and transforming rigid compression into flexible buffering. This reduces the risk of brick breakage or damage to the inner cylinder wall 201 due to pressure. Fiber cotton 108 can be ceramic fiber cotton.

[0053] In one possible implementation, fiber cotton 108 is provided on the side of the third precast brick 107 that contacts the inner cylinder wall 201.

[0054] Combination Figure 1 and Figure 5 As shown, in some embodiments, the distance between the upper edge of the first groove 102 and the outer wall of the steel cylinder 200 is greater than the distance between the lower edge of the first groove 102 and the outer wall of the steel cylinder 200. The distance between the upper edge of the second groove 104 and the outer wall of the steel cylinder 200 is greater than the distance between the lower edge of the second groove 104 and the outer wall of the steel cylinder 200.

[0055] like Figure 1As shown, by ensuring that the distance between the upper edge of the first groove 102 and the outer wall of the steel cylinder 200 is greater than the distance between the lower edge of the first groove 102 and the outer wall of the steel cylinder 200, and that the distance between the upper edge of the second groove 104 and the outer wall of the steel cylinder 200 is greater than the distance between the lower edge of the second groove 104 and the outer wall of the steel cylinder 200, a tapered hole 105 with an approximately tapered longitudinal section is defined. Here, the longitudinal section can be a section formed by cutting the masonry unit along the axial direction of the steel cylinder 200.

[0056] After the castable refractory is formed within the conical hole 105, it creates a frustum-shaped casting layer 106, wider at the top and narrower at the bottom. Due to the narrow space below and wide space above, this casting block cannot fall downwards under gravity. Furthermore, it cannot be directly pushed out by the upward buoyancy or thrust of hot airflow. This significantly enhances the stability of the castable refractory under long-term high-temperature erosion and increases the resistance to high-temperature flue gas rising along the outer wall of the steel cylinder 200, thus improving sealing.

[0057] Combination Figure 1 and Figure 5 As shown, in some embodiments, the distance between the upper edge of the first groove 102 and the outer wall of the steel cylinder 200 is 75mm to 80mm, and the distance between the upper edge of the second groove 104 and the outer wall of the steel cylinder 200 is 75mm to 80mm.

[0058] The distances between the upper edges of the first groove 102 and the second groove 104 and the outer wall of the steel cylinder 200 are 75mm to 80mm, respectively, to ensure that both the castable refractory and the steel cylinder 200 have sufficient expansion margin at high temperatures, preventing mutual compression damage. This also helps to pre-adjust the brick joints of the first precast brick 101 and the second precast brick 103, facilitating the alignment of each conical hole 105 with the corresponding steel cylinder 200, ensuring a dimensional deviation of ≤10mm, thereby improving masonry efficiency and reducing construction difficulty.

[0059] Combination Figure 6 As shown, this application provides a method for constructing a masonry structure 100, comprising the following steps: S11. Place the first precast brick on one side of the steel cylinder, and make the first groove of the first precast brick surround a part of the steel cylinder.

[0060] By initially positioning the first groove 102 of the first precast brick 101 with the steel cylinder 200, the annular gap between the precast brick and the steel cylinder 200 can be made uniform and centered, providing a regular filling space for the subsequent casting layer 106 to form a uniform sealing structure.

[0061] Specifically, the wide and narrow sides of the first precast brick 101 are respectively located on the shoulders of the kiln shell wall 202 and the inner cylinder wall 201, so that the first precast brick 101 is placed on one side of the steel cylinder 200, and the first groove 102 of the first precast brick 101 surrounds a part of the steel cylinder 200, with the upper edge of the first groove 102 about 75mm to 80mm away from the steel cylinder 200.

[0062] S12. Place the second precast brick on the other side of the steel cylinder, and make the second groove of the second precast brick together with the first groove define a tapered hole around the steel cylinder.

[0063] Two precast bricks simultaneously constrain the steel cylinder 200 from both sides, achieving the final positioning of the steel cylinder 200 in the horizontal plane, making the gaps around the steel cylinder 200 uniform, and ensuring that the conical space around each steel cylinder 200 has consistent and regular dimensions.

[0064] Specifically, the wide and narrow sides of the second precast brick 103 are placed on the shoulders of the kiln shell wall 202 and the inner cylinder wall 201, respectively, so that the second precast brick 103 is placed on the other side of the steel cylinder 200, and the second groove 104 of the second precast brick 103 and the first groove 102 together define a conical hole 105 surrounding the steel cylinder 200, with the upper edge of the second groove 104 about 75mm to 80mm away from the steel cylinder 200.

[0065] S13. Fill the space between the first groove, the second groove and the outer wall of the steel cylinder with castable material to form a casting layer in the conical hole.

[0066] Fill the space between the first groove, the second groove and the outer wall of the steel cylinder with castable material. Specifically, fill the space between the interior of the first groove 102, the interior of the second groove 104 and the outer wall of the steel cylinder 200 with castable material.

[0067] After the refractory material is filled, the gap between the precast bricks and the steel cylinder 200 is eliminated, forming a continuous and dense sealing layer. This effectively prevents high-temperature dusty flue gas from escaping upwards along the outer wall of the steel cylinder 200, achieving a seamless seal. The refractory layer 106, as a flexible transition layer, buffers the thermal expansion mismatch between the steel cylinder 200 and the precast bricks, further improving the overall integrity.

[0068] In some embodiments, after the step of filling the space between the first groove 102, the second groove 104 and the outer wall of the steel cylinder 200 with castable material to form a castable layer 106 in the conical hole 105, the masonry method further includes: laying a third precast brick 107 on the side of the first precast brick 101 opposite to the second precast brick 103 and on the side of the second precast brick 103 opposite to the first precast brick 101, respectively.

[0069] After the refractory material has solidified, adjacent bricks are laid to prevent damage to the uncured refractory layer 106 caused by construction vibrations. By using the already cured refractory layer 106 and the steel cylinder 200 as the core and expanding the masonry outwards, the overall stability of the masonry structure 100 can be maintained.

[0070] In some embodiments, prior to the step of placing the first precast brick 101 on one side of the steel cylinder 200 and having the first groove 102 of the first precast brick 101 enclose a portion of the steel cylinder 200, the masonry method further includes: laying fiber cotton 108 on the inner cylinder wall 201, wherein the fiber cotton 108 is located at least at the position where the inner cylinder wall 201 contacts the first precast brick 101 and the second precast brick 103.

[0071] Fiber cotton 108 is laid on the inner cylinder wall 201, which can fill the gap between the precast bricks and the bricks of the inner cylinder wall 201, and can effectively buffer the thermal expansion of the refractory material during production and operation.

[0072] In one possible implementation, the thickness of the fiber cotton 108 laid on the inner cylinder wall 201 is 10mm.

[0073] In one possible implementation, high-alumina refractory mortar is used to bond the brick layers together, and the thickness of the refractory mortar between the precast bricks is controlled between 1mm and 2mm, with a maximum of no more than 3mm, in order to adjust the dimensional accuracy of the precast bricks and the steel cylinder 200.

[0074] By optimizing the masonry structure 100 and its combination, and by selecting high-strength, erosion-resistant, and other thermally effective materials, and through positioning and masonry techniques, rapid construction and good integrity of the top of the annular channel are achieved. The superior strength, sealing, and heat insulation properties of the refractory materials extend the service life of the masonry structure 100 at the top of the annular channel. This effectively solves the problems of refractory brick breakage, falling bricks, detachment, and collapse caused by high-temperature thermal stress, improves kiln safety, significantly reduces the need for kiln refractory material maintenance, and thus lowers production costs.

[0075] Combination Figure 7 As shown, this application provides a method for constructing a masonry structure 100, which includes the following steps: S21. Fiber cotton is laid on the inner cylinder wall, and the fiber cotton is located at least at the position where the inner cylinder wall contacts the first precast brick and the second precast brick.

[0076] S22. Place the first precast brick on one side of the steel cylinder, and make the first groove of the first precast brick surround a part of the steel cylinder.

[0077] S23. Place the second precast brick on the other side of the steel cylinder, and make the second groove of the second precast brick together with the first groove define a tapered hole around the steel cylinder.

[0078] S24. Fill the space between the first groove, the second groove and the outer wall of the steel cylinder with castable material to form a casting layer in the conical hole.

[0079] S25. On the side of the first precast brick facing away from the second precast brick and on the side of the second precast brick facing away from the first precast brick, the third precast brick is laid.

[0080] Specifically, starting with a steel cylinder 200 in the annular channel next to the direct connection channel of the double-chamber kiln, the masonry is constructed sequentially until the last steel cylinder 200 next to the direct connection channel. Taking the masonry structure 100 outside one of the steel cylinders 200 as an example, first, the steel cylinder 200 is placed into the fire-starting hole. Before masonry, the following steps are performed for inspection and confirmation: Use a level to check the levelness of the brickwork surface of the inner cylinder wall 201 and the kiln shell wall 202; Use a ruler to check the height of the brickwork surface of the inner cylinder wall 201 and the kiln shell wall 202, as well as the distance from the brickwork surface to the top of the steel shell of the annular channel, keeping the error within ±20mm; otherwise, consider filling with castable refractory for leveling; Check the distance between the inner cylinder wall 201 and the kiln shell wall 202, checking at least 8 points in different directions, with a deviation from the drawing within ±10mm. After confirmation, masonry is carried out. Fiber cotton 108 with a thickness of 10mm is first placed on the shoulder of the inner cylinder wall 201. A first precast brick 101 is placed on one side of the steel cylinder 200, such that the first groove 102 of the first precast brick 101 surrounds a portion of the steel cylinder 200. The upper edge of the first groove 102 is approximately 75mm to 80mm from the steel cylinder 200, and the wide and narrow sides of the first precast brick 101 rest on the shoulders of the kiln shell wall 202 and the inner cylinder wall 201, respectively. A second precast brick 103 is then placed on the other side of the steel cylinder 200, such that the second groove 104 of the second precast brick 103, together with the first groove 102, defines a conical hole 105 surrounding the steel cylinder 200. The upper edge of the second groove 104 is approximately 75mm to 80mm from the steel cylinder 200, and the wide and narrow sides of the second precast brick 103 rest on the shoulders of the kiln shell wall 202 and the inner cylinder wall 201, respectively. Then, refractory material is filled between the first groove 102, the second groove 104 and the outer wall of the steel cylinder 200 to form a casting layer 106 in the conical hole 105. Finally, third precast bricks 107 are laid on the side of the first precast brick 101 away from the second precast brick 103 and on the side of the second precast brick 103 away from the first precast brick 101, respectively.

[0081] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A masonry structure for use in the annular passageway of a twin-shell kiln defined by an inner shell wall and a kiln shell wall, characterised in that, The masonry structure includes: The first precast brick has a first groove on one side; The second precast brick is provided with a second groove, the opening of the second groove is opposite to the opening of the first groove, and the second groove and the first groove together define a tapered hole for surrounding the steel cylinder. The casting layer is formed inside the tapered hole and located on the outside of the steel cylinder.

2. The masonry structure of claim 1, wherein, Also includes: The third precast brick is disposed on the side of the first precast brick away from the second precast brick or on the side of the second precast brick away from the first precast brick. The length directions of the first precast brick, the second precast brick, and the third precast brick extend radially along the annular channel, respectively.

3. The masonry structure of claim 2, wherein, At least one first precast brick and at least one corresponding second precast brick constitute a masonry unit; Multiple masonry units are arranged at circumferential intervals along the annular channel, and the third precast bricks are placed between adjacent masonry units.

4. The masonry structure according to claim 1, characterized in that, The masonry structure is located within the annular channel, and the bottom of the first precast brick and the second precast brick near the inner cylinder wall are respectively provided with chamfered corners.

5. The masonry structure according to claim 1, characterized in that, Also includes: Fiber cotton is placed on the side of the first precast brick and the second precast brick that are in contact with the inner cylinder wall, respectively, to absorb thermal expansion.

6. The masonry structure according to claim 1, characterized in that, The distance between the upper edge of the first groove and the outer wall of the steel cylinder is greater than the distance between the lower edge of the first groove and the outer wall of the steel cylinder. The distance between the upper edge of the second groove and the outer wall of the steel cylinder is greater than the distance between the lower edge of the second groove and the outer wall of the steel cylinder.

7. The masonry structure according to claim 1, characterized in that, The distance between the upper edge of the first groove and the outer wall of the steel cylinder is 75mm to 80mm, and the distance between the upper edge of the second groove and the outer wall of the steel cylinder is 75mm to 80mm.

8. A method for constructing a masonry structure, used for constructing a masonry structure as described in any one of claims 1 to 7, characterized in that, The masonry construction method for the masonry structure includes the following steps: The first precast brick is placed on one side of the steel cylinder, and the first groove of the first precast brick surrounds a portion of the steel cylinder. The second precast brick is placed on the other side of the steel cylinder, and the second groove of the second precast brick, together with the first groove, defines a tapered hole around the steel cylinder; Fill the space between the first groove, the second groove and the outer wall of the steel cylinder with castable material to form a casting layer in the conical hole.

9. The masonry method according to claim 8, characterized in that, After the step of filling the space between the first groove, the second groove, and the outer wall of the steel cylinder with castable refractory to form a castable layer within the conical hole, the masonry method further includes: Third precast bricks are laid on the side of the first precast brick away from the second precast brick and on the side of the second precast brick away from the first precast brick, respectively.

10. The masonry method according to claim 8, characterized in that, Before the step of placing the first precast brick on one side of the steel cylinder and having the first groove of the first precast brick enclose a portion of the steel cylinder, the masonry method further includes: Fiber cotton is laid on the inner cylinder wall, with the fiber cotton located at least at the position where the inner cylinder wall contacts the first precast brick and the second precast brick.

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