A connection device for a decomposition furnace and a flue

Abstract

The utility model discloses a connecting device of decomposition furnace and smoke chamber, including first reducing joint, intermediate section and second reducing joint from top to bottom are connected in proper order, the inside communication of first reducing joint, intermediate section and second reducing joint forms airflow channel, the inner wall of airflow channel is staggered and laid with silicon morr brick, and the expansion joint is arranged between the adjacent silicon morr brick, and the expansion joint is filled with high temperature ceramic fiber rope and self flow material, the utility model discloses a connecting device realizes the smooth conversion of decomposition furnace bottom cone circular and smoke chamber interface square section, avoids the airflow in airflow channel greatly reduced speed, makes the eddy current area area reduction, raw material particle accumulation amount reduces, reduces the frequency of the collapse, and the material is changed, through the setting expansion joint, absorbs the cold and hot state expansion difference, avoids the connecting device and damages because of thermal stress, through the airflow channel inner wall staggered and laid silicon morr brick, improves airflow channel antiskinning performance.

Description

Technical Field

[0001] This utility model relates to the field of decomposition furnace technology, and in particular to a connection device between a decomposition furnace and a smoke chamber. Background Technology

[0002] The decomposition furnace is an important pretreatment equipment in the cement production process. It is used to decompose carbonates into calcium oxide and carbon dioxide. The flue is the material and airflow channel between the decomposition furnace and the rotary kiln. The material discharged from the bottom of the decomposition furnace needs to be introduced into the rotary kiln through the flue.

[0003] The existing decomposition furnace has a conical bottom and a circular interface, while the smoke chamber is square. The interfaces and cross-sections of the two are not compatible. The existing decomposition furnace bottom and smoke chamber are mostly connected by a simple direct connection structure. This causes the airflow velocity to change abruptly at the interface due to the cross-section, forming an obvious vortex zone. The raw material particles carried by the airflow in the vortex zone are stuck due to the sudden drop in flow velocity, and the accumulation is 2-3 times higher than in the normal area. The accumulated particles are prone to agglomerate to form material clumps. After these material clumps accumulate to the critical mass, they are suddenly dropped by the airflow impact, causing frequent material collapse and material leakage. Furthermore, the inner walls of existing docking structures are mostly made of refractory castables. The surface of refractory castables easily adsorbs ions such as alkali, chlorine, and sulfur, which easily form a crust. Cleaning can easily damage the inner wall structure. The connection area between the decomposition furnace and the smoke chamber is subjected to the high temperature of flue gas for a long time, and the large difference in expansion between hot and cold states can easily cause damage to the connection structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a connection device between a decomposition furnace and a smoke chamber, thereby solving the problems mentioned in the background section. To achieve the above objective, the present utility model adopts the following technical solution: The connection device between the decomposition furnace and the smoke chamber includes a first variable diameter joint, an intermediate section and a second variable diameter joint connected sequentially from top to bottom. The internal connections of the first variable diameter joint, the intermediate section and the second variable diameter joint form an airflow channel. The intermediate section includes a first connecting section, an expansion joint, and a second connecting section, wherein the expansion joint is disposed between the first connecting section and the second connecting section; The inner wall of the airflow channel is laid with staggered silicon-mullite bricks, and an expansion joint is provided between adjacent silicon-mullite bricks. The expansion joint is filled with high-temperature ceramic fiber rope, and the space between the silicon-mullite bricks and the airflow channel is filled with self-flowing material.

[0005] Optionally, the top end of the first reducing connector is a circular port for connecting to the tapered constriction at the bottom of the decomposition furnace, and the bottom end of the first reducing connector is a square interface for connecting to the middle section.

[0006] Optionally, the second reducing connector is a square reducing connector, with its top end abutting the second connecting section and its bottom end abutting the smoke chamber.

[0007] Optionally, the expansion joint is square in shape, with a semi-circular cross-section.

[0008] Optionally, the silicon-mullite brick is detachably connected to the inner wall of the airflow channel via a fixing device. The fixing device includes a fixing base and a connector. The fixing base is connected to the inner wall of the airflow channel, and the first end of the connector is detachably connected to the silicon-mullite brick, while the other end is connected to the fixing base.

[0009] Optionally, the fixing base is provided with a connecting channel in the middle for the end of the connector to pass through.

[0010] Optionally, a heat insulation board is laid between the silicon-mullite brick and the inner wall of the airflow channel.

[0011] Optionally, the silicon-mullite brick includes a working part and a fixing part, the working part facing the middle of the airflow channel, and a mounting hole provided on one side of the fixing part, and the first end of the connector is detachably connected to the mounting hole.

[0012] Optionally, the fixing part is integrally formed on the side of the working part away from the airflow channel, and protrudes from the end surface of the working part along the thickness direction of the working part; the cross-sectional dimension of the fixing part is smaller than the corresponding cross-sectional dimension of the working part, and the geometric center of the fixing part coincides with the geometric center of the side of the working part away from the airflow channel, and the periphery of the fixing part is used for the flow of the self-flowing material.

[0013] Optionally, a material passage is provided between the heat insulation plate and the silicon-mullite brick.

[0014] Compared to existing technologies, the advantages of this invention are as follows: By using the above-mentioned solution, the present invention achieves a smooth transition between the circular cone at the bottom of the decomposition furnace and the square cross-section of the flue gas chamber interface through the segmented transition of the first variable diameter joint, the intermediate section, and the second variable diameter joint. This avoids a decrease in airflow velocity, reduces the area of ​​the vortex zone, decreases the amount of raw material particles accumulated, and reduces the frequency of material collapse and material leakage. By setting an expansion joint between the first and second connecting sections, the difference in expansion between hot and cold states is absorbed, preventing damage to the connecting device due to thermal stress. By laying silica-molybdenum bricks in staggered joints on the inner wall of the airflow channel, the anti-scabbing performance is improved, the cleaning cycle is extended, the internal structural strength of the airflow channel is improved, and the damage rate of the connecting device is reduced. By filling the expansion joints with high-temperature ceramic fiber ropes and filling the space between the silica-molybdenum bricks and the inner wall of the airflow channel with self-flowing material, heat loss from the airflow channel is avoided, energy consumption is reduced, and high-temperature deformation of the connecting device is prevented. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the external structure of the connecting device of this utility model; Figure 2 This is a schematic diagram of the middle section structure of the connecting device of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the expansion joint of this utility model; Figure 4 This is a schematic diagram of the connection structure between the inner wall of the airflow channel and the silicon-mullite brick of this utility model; Figure 5 This is a schematic diagram of the fixing base, connector and silicon-mullite brick structure of this utility model; Explanation of reference numerals in the attached drawings: 1. First reducing joint; 2. Intermediate section; 3. Second reducing joint; 4. Airflow channel; 5. Silicon-mullite brick; 6. Expansion joint; 7. Fixing device; 8. Heat insulation board; 9. Material passage; 21. First connecting section; 22. Expansion joint; 23. Second connecting section; 71. Fixing base; 72. Connecting piece; 51. Mounting hole; 73. Connecting channel; 52. Working part; 53. Fixing part. Detailed Implementation

[0016] To facilitate understanding of this application, a more detailed description of the application is provided below with reference to the accompanying drawings and specific embodiments; preferred embodiments of the application are shown in the drawings; however, the application may be implemented in many different forms and is not limited to the embodiments described in this specification; rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this application.

[0017] It should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and back) are used to explain the structure and movement of various components and are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0018] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application 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 so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0020] like Figures 1-4 As shown, one embodiment of the present invention is a connection device between the decomposition furnace and the smoke chamber, which is used to connect the decomposition furnace and the smoke chamber. The connection device is formed by welding steel plates and includes a first variable diameter joint 1, an intermediate section 2 and a second variable diameter joint 3 connected sequentially from top to bottom. The internal connections of the first variable diameter joint 1, the intermediate section 2 and the second variable diameter joint 3 form an airflow channel 4, and the two ends of the airflow channel 4 are respectively connected to the decomposition furnace and the smoke chamber. The intermediate section 2 includes a first connecting section 21, an expansion joint 22, and a second connecting section 23. The expansion joint 22 is disposed between the first connecting section 21 and the second connecting section 23. Both the first connecting section 21 and the second connecting section 23 are square pipes. The inner wall of the airflow channel 4 is laid with staggered silica-mullite bricks 5, and expansion joints 6 are left between adjacent silica-mullite bricks 5. The expansion joints 6 are filled with high-temperature ceramic fiber ropes, and the space between the silica-mullite bricks 5 and the inner wall of the airflow channel 4 is filled with self-flowing material. The self-flowing material is a combination of aluminate cement, high-alumina aggregate, and corundum fine powder. The self-flowing material is resistant to high temperature and has high compressive strength. Through gravity flow, the gaps between the expansion joints 6 and the silica-mullite bricks 5 and the inner wall of the airflow channel 4 are densely filled.

[0021] This application achieves a smooth transition between the circular cone at the bottom of the decomposition furnace and the square cross-section of the flue gas chamber interface through the segmented transition of the first reducing joint 1, the intermediate section 2, and the second reducing joint 3. This avoids a decrease in the velocity of the airflow within the airflow channel 4, reduces the area of ​​the vortex zone, decreases the amount of raw material particles accumulated, and reduces the frequency of material collapse and material leakage. By setting an expansion joint 22 between the first connecting section 21 and the second connecting section 23, the difference in expansion between hot and cold states is absorbed, preventing damage to the connecting device due to thermal stress. By laying silica-molybdenum bricks 5 in staggered joints on the inner wall of the airflow channel 4, the anti-scabbing performance is improved, the cleaning cycle is extended, the internal structural strength of the airflow channel 4 is improved, and the damage rate of the connecting device is reduced. By filling the expansion joint 6 with high-temperature ceramic fiber rope and filling the space between the silica-molybdenum bricks 5 and the inner wall of the airflow channel 4 with self-flowing material, heat loss from the airflow channel 4 is avoided, energy consumption is reduced, and high-temperature deformation of the connecting device is prevented.

[0022] In one embodiment, such as Figure 1As shown, the top of the first reducing connector 1 is a circular port for connecting to the conical constriction at the bottom of the decomposition furnace, and the bottom of the first reducing connector 1 is a square interface for connecting to the middle section 2. The inner wall of the first reducing connector 1 is a gradually changing streamlined shape. The gradual change from circular to square streamlined shape eliminates the phenomenon of sudden drop in airflow velocity, ensuring that the gas-material mixture discharged from the conical constriction of the decomposition furnace smoothly enters the middle section 2, and avoiding the formation of eddy currents at the interface.

[0023] In one embodiment, such as Figure 1 As shown, the second reducing connector 3 is a square reducing connector with its top end connected to the second connecting section 23. The cross-sectional size is uniformly enlarged from the top end to the bottom end. Its bottom end is connected to the smoke chamber. Through the square enlargement design, the gas material is prevented from colliding and accumulating at the smoke chamber inlet, preventing crusting. The size of the square channel of the middle section 2 is matched with the square inlet of the smoke chamber, ensuring that the gas material enters the smoke chamber uniformly and avoiding flow deviation.

[0024] In one embodiment, such as Figure 2 , Figure 3 As shown, the expansion joint 22 is square in shape and is formed by splicing and welding four sections of steel pipe. The cross-section of the steel pipe is semi-circular, with the straight section facing inward and the arc section facing outward. Its upper end is welded to the square port of the first connecting section 21, and its lower end is welded to the square port of the second connecting section 23. The square overall structure is adapted to the square channel of the middle section 2. The semi-circular cross-section provides flexible deformation space to absorb the difference in expansion between the hot and cold states of the connection area between the decomposition furnace and the smoke chamber, thus avoiding the connection device from cracking or deforming.

[0025] In one embodiment, such as Figure 4 As shown, the silicon mahogany brick 5 is detachably connected to the inner wall of the airflow channel 4 via a fixing device 7. The fixing device 7 includes a fixing base 71 and a connector 72. The fixing base 71 is connected to the inner wall of the airflow channel 4, and the first end of the connector 72 is detachably connected to the silicon mahogany brick 5, while the other end is connected to the fixing base 71.

[0026] Specifically, the fixing seat 71 is welded to the inner wall of the airflow channel 4, and the side of the silicon mahogany brick 5 is provided with an installation hole 51. The two ends of the connector 72 are bent to form hooks. The first end is inserted into the installation hole 51, and the second end is welded to the fixing seat 71 to ensure the stability of the position and angle of the silicon mahogany brick 5, so as to install and replace the silicon mahogany brick 5.

[0027] In one embodiment, such as Figure 5 As shown, the fixing base 71 is U-shaped or V-shaped, and a connecting channel 73 is provided in the middle for the end of the connector 72 to pass through. The second end of the connector 72 passes through the connecting channel 73 and is welded to the fixing base 71.

[0028] In one embodiment, such as Figure 4As shown, a heat insulation board 8 is laid between the silicate brick 5 and the inner wall of the airflow channel 4. The heat insulation board 8 is made of calcium silicate and is bonded to the inner wall of the airflow channel 4 with a high-temperature adhesive. It is located between the inner wall of the airflow channel 4 and the silicate brick 5. Through the low thermal conductivity of the calcium silicate heat insulation board 8, the transfer of high temperature in the airflow channel 4 to the shell is reduced; direct contact between the silicate brick 5 and the metal shell is avoided, the brick stress caused by the difference between hot and cold shrinkage is reduced, and the service life of the silicate brick 5 is improved.

[0029] In one embodiment, such as Figure 5 As shown, the silicon malon brick 5 includes a working part 52 and a fixing part 53. The working part 52 of the silicon malon brick 5 is rectangular and faces the middle of the airflow channel 4. The fixing part 53 is rectangular and integrally formed with the working part 52. A mounting hole 51 is reserved on one side of the fixing part 53. The mounting hole 51 has a preset bending angle along its axis. The first end of the connector 72 matches the mounting hole 51. After being inserted into the mounting hole 51, a stable connection between the silicon malon brick 5 and the fixing seat 71 is achieved.

[0030] In one embodiment, such as Figure 5 As shown, the fixing part 53 is integrally formed on the side of the working part 52 away from the airflow channel 4, and protrudes from the end surface of the working part 52 along the thickness direction of the working part 52. The cross-sectional dimension of the fixing part 53 is smaller than the corresponding cross-sectional dimension of the working part 52, and the geometric center of the fixing part 53 coincides with the geometric center of the working part 52 on the side away from the airflow channel 4. The periphery of the fixing part 53 is used for the flow of self-flowing material. When the self-flowing material is filled, it can flow through the gap on the periphery of the fixing part 53, thereby filling the expansion joint 6.

[0031] In one embodiment, such as Figure 4 As shown, a material passage 9 is provided between the insulation board 8 and the silicon mahogany brick 5. During the filling of the self-flowing material, it flows through the material passage 9 to the periphery of the silicon mahogany brick 5 and the expansion joint 6, expelling the air in the gap and ensuring that the self-flowing material is dense. This allows the silicon mahogany brick 5 and the insulation board 8 to form an integral lining within the airflow channel 4, improving the stability of the silicon mahogany brick 5 and protecting the fixing device 7, while also enhancing the heat insulation and sealing effect.

[0032] It should be noted that the above-mentioned technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification; and, for those skilled in the art, improvements or modifications can be made based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims of this utility model.

Claims

1. A connection device between a decomposition furnace and a smoke chamber, characterized in that, It includes a first variable diameter joint, an intermediate section and a second variable diameter joint connected from top to bottom, and the internal connections of the first variable diameter joint, the intermediate section and the second variable diameter joint form an airflow channel. The intermediate section includes a first connecting section, an expansion joint, and a second connecting section, wherein the expansion joint is disposed between the first connecting section and the second connecting section; The inner wall of the airflow channel is laid with staggered silicon-mullite bricks, and an expansion joint is provided between adjacent silicon-mullite bricks. The expansion joint is filled with high-temperature ceramic fiber rope, and the space between the silicon-mullite bricks and the airflow channel is filled with self-flowing material.

2. The connection device between the decomposition furnace and the smoke chamber according to claim 1, characterized in that, The top end of the first reducing connector is a circular port for connecting to the tapered constriction at the bottom of the decomposition furnace, and the bottom end of the first reducing connector is a square interface for connecting to the middle section.

3. The connection device between the decomposition furnace and the smoke chamber according to claim 1, characterized in that, The second reducing connector is a square reducing connector, with its top end connected to the second connecting section and its bottom end connected to the smoke chamber.

4. The connection device between the decomposition furnace and the smoke chamber according to claim 1, characterized in that, The expansion joint is square in shape, with a semi-circular cross-section.

5. The connection device between the decomposition furnace and the smoke chamber according to claim 1, characterized in that, The silicon-mullite brick is detachably connected to the inner wall of the airflow channel by a fixing device. The fixing device includes a fixing base and a connector. The fixing base is connected to the inner wall of the airflow channel. The first end of the connector is detachably connected to the silicon-mullite brick, and the other end is connected to the fixing base.

6. The connection device between the decomposition furnace and the smoke chamber according to claim 5, characterized in that, The fixing base has a connecting channel in the middle for the end of the connector to pass through.

7. The connection device between the decomposition furnace and the smoke chamber according to claim 1, characterized in that, A heat insulation board is laid between the silicon-mullite brick and the inner wall of the airflow channel.

8. The connection device between the decomposition furnace and the smoke chamber according to claim 5, characterized in that, The silicon-mullite brick includes a working part and a fixing part. The working part faces the middle of the airflow channel, and the fixing part has a mounting hole on one side. The first end of the connector is detachably connected to the mounting hole.

9. The connection device between the decomposition furnace and the smoke chamber according to claim 8, characterized in that, The fixing part is integrally formed on the side of the working part away from the airflow channel, and protrudes from the end surface of the working part along the thickness direction of the working part; the cross-sectional dimension of the fixing part is smaller than the corresponding cross-sectional dimension of the working part, and the geometric center of the fixing part coincides with the geometric center of the side of the working part away from the airflow channel, and the periphery of the fixing part is used for the flow of the self-flowing material.

10. The connection device between the decomposition furnace and the smoke chamber according to claim 7, characterized in that, A material passage is provided between the heat insulation board and the silicon-mullite brick.

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