Thermal-state maintenance method for side wall of uptake flue of flash furnace

Abstract

The invention discloses a hot-state maintenance method for a side wall of an uptake flue of a flash furnace. The hot-state maintenance method comprises the following steps: manufacturing a supporting steel plate according to the radian of a burn-through position of the side wall of the uptake flue, manufacturing a vertical surface water jacket according to the radian of the burn-through position, and manufacturing a horizontal water jacket according to the thickness of the side wall of the uptake flue; and then independent cooling systems of the horizontal water jacket and the vertical surface water jacket are combined with a layer-by-layer masonry refractory brick structure, and reinforcement and sealing treatment of a supporting steel plate are assisted. Compared with a traditional method, the method has the advantages that the burn-through part can be thoroughly repaired without blowing out for cold repair, the production shutdown time and economic loss are greatly reduced, the safety and operation stability of the repaired furnace body are comprehensively guaranteed, and normal production and operation of the flash furnace are not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of hot maintenance, and more particularly to a hot maintenance method for a side wall of a flash furnace ascending flue. Background Art

[0002] The updraft flue of a flash furnace is a key channel for exhausting smoke. Its side walls are typically constructed of steel plates and refractory bricks to resist erosion and scouring by high-temperature flue gases. However, due to the high velocity and temperature of the flue gases, the side walls of the updraft flue are exposed to high heat loads and intense scouring for long periods of time, making them susceptible to wear and tear.

[0003] In actual operation, the side walls of the flash furnace's ascending flue are prone to problems such as refractory bricks falling off and difficulty hanging slag due to the rapid flow and scouring of high-temperature flue gas, further causing local reddening of the side walls and even burn-through. To address this problem, conventional treatment methods mainly include forced cooling in the hot state (such as external air ducts or buried pipes for water flow) and reducing the heat load and process air volume to alleviate the problem, as well as rebuilding the side walls in the cold state. However, these methods cannot fundamentally solve the problem of reddening and burn-through of the side walls, posing a safety hazard to the furnace body. At the same time, they will also affect the loading capacity and production efficiency of the flash furnace, restricting the long-term stable operation of the equipment.

[0004] Therefore, it is necessary to provide a hot maintenance method for the side wall of the rising flue of a flash furnace, which can completely repair the burned-through part without stopping the furnace for cold repair and will not affect the normal production operation of the flash furnace. Summary of the Invention

[0005] In view of this, the present invention provides a method for hot maintenance of the side wall of the ascending flue of a flash furnace, comprising the steps of:

[0006] A supporting steel plate is fabricated according to the curvature of the burn-through position of the riser flue side wall, a vertical water jacket is fabricated according to the curvature of the burn-through position, and a horizontal water jacket is fabricated according to the thickness of the riser flue side wall. The horizontal water jacket is longer in the left-right direction than the thickness of the riser flue side wall. In the left-right direction, the side of the supporting steel plate and the horizontal water jacket close to the interior of the riser flue is flush with the riser flue side wall. In the front-to-back direction, the side of the supporting steel plate and the horizontal water jacket close to the interior of the riser flue is in line with the shape of the riser flue side wall. The vertical water jacket is in line with the shape and size of the burn-through position.

[0007] A supporting steel plate is provided at the bottom of the burn-through position, the supporting steel plate extending in the left-right direction, and the supporting steel plate is welded to the rib plate and the outer shell steel plate of the ascending flue;

[0008] Extend the horizontal water jacket into the side wall of the ascending flue in the left and right directions, and connect the horizontal water jacket to the supporting steel plate with bolts;

[0009] Lay refractory bricks layer by layer above the horizontal water jacket in the vertical direction until the height of the refractory bricks in the vertical direction is 400mm-600mm;

[0010] Install support steel plates on the top layer of refractory bricks in the vertical direction, and repeat the steps of installing a horizontal water jacket and laying refractory bricks until the refractory bricks are in contact with the top of the burn-through position.

[0011] A vertical water jacket is provided on the side of the refractory brick away from the rising flue;

[0012] A connecting box is provided, which is a cube and is located between the supporting steel plate and the unburned position of the ascending flue; the connecting box is welded to the supporting steel plate; the connecting box includes a copper tube provided inside, and the interior of the connecting box is sealed by pouring castable material.

[0013] Optionally, along the left-right direction, the depth of the horizontal water jacket extending into the side wall of the ascending flue is greater than or equal to the length of the refractory bricks.

[0014] Optionally, before laying refractory bricks layer by layer above the horizontal water jacket, the method further includes the following steps: after the first layer of the horizontal water jacket is installed, the horizontal water jacket is cooled by water.

[0015] Optionally, after the vertical water jacket is provided, the method further includes: providing a steel beam on the side of the vertical water jacket away from the refractory bricks, the steel beam extending in the up and down directions, and both ends of the steel beam being welded to the supporting steel plate.

[0016] Optionally, expansion joints are provided between adjacent refractory bricks in the vertical direction, and the expansion joints are filled with a buffer material and are refractory to high temperatures. The buffer material is ceramic fiber felt or expanded graphite gasket.

[0017] Optionally, the height of the expansion joint is 0.5 mm to 3 mm in the up and down directions.

[0018] Compared with the prior art, the hot maintenance method for the side wall of the rising flue of a flash furnace provided by the present invention achieves at least the following beneficial effects:

[0019] The present invention provides a hot maintenance method for the side wall of a flash furnace ascending flue, comprising the steps of: manufacturing a supporting steel plate according to the curvature of a burn-through position of the ascending flue side wall, manufacturing a vertical water jacket according to the curvature of the burn-through position, and manufacturing a horizontal water jacket according to the thickness of the ascending flue side wall; then combining the independent cooling systems of the horizontal water jacket and the vertical water jacket with a layer-by-layer refractory brick structure, supplemented by reinforcement and sealing treatment of the supporting steel plate. The horizontal water jacket and the vertical water jacket provide efficient heat dissipation protection for the repair area. The refractory bricks laid layer by layer adopt a thermal expansion buffer structure design, which significantly improves the heat resistance, erosion resistance and thermal stress adaptability of the repair area; the structure of the supporting steel plate and the connecting box enhances the air tightness and mechanical strength of the structure. Through the multi-layer composite structure design and leak repair method under hot state, the burned-through parts of the side wall of the ascending flue can be completely repaired while the flash furnace is continuously running, and the redness problem of the side wall can be effectively solved. Compared with the traditional method, this method can completely repair the burned-through parts without stopping the furnace for cold repair, which greatly reduces production downtime and economic losses. The safety and operation stability of the furnace body after repair are fully guaranteed, and will not affect the normal production and operation of the flash furnace.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0023] Figure 1 This is a flow chart of a method for hot maintenance of a side wall of a flash furnace ascending flue provided by the present invention;

[0024] Figure 2 A schematic structural diagram of the repair area of ​​a hot maintenance method for a side wall of a flash furnace ascending flue provided by the present invention;

[0025] Figure 3 A schematic structural diagram of the repair area of ​​another method for hot repair of a flash furnace ascending flue side wall provided by the present invention;

[0026] Figure 4 A schematic structural diagram of the repair area of ​​another method for hot repair of a flash furnace ascending flue side wall provided by the present invention;

[0027] Figure 5 A schematic structural diagram of the connection box of the present invention;

[0028] 1-Supporting steel plate, 2-Refractory brick, 3-Horizontal water jacket, 4-Vertical water jacket, 5-Connection box, 51-Copper pipe, 6-Rising flue side wall. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] Reference Figure 1-Figure 5 The present invention provides a method for hot maintenance of the side wall of the rising flue of a flash furnace, comprising the steps of:

[0035] S1: A support steel plate 1 is manufactured according to the curvature of the burn-through position of the ascending flue side wall 6, a vertical water jacket 4 is manufactured according to the curvature of the burn-through position, and a horizontal water jacket 3 is manufactured according to the thickness of the ascending flue side wall 6; the length of the horizontal water jacket 3 in the left-right direction is greater than the thickness of the ascending flue side wall 6, and along the left-right direction, the side of the support steel plate 1 and the horizontal water jacket 3 close to the interior of the ascending flue is flush with the ascending flue side wall 6; along the front-to-back direction, the side of the support steel plate 1 and the horizontal water jacket 3 close to the interior of the ascending flue is in conformity with the shape of the ascending flue side wall 6; the vertical water jacket 4 is in conformity with the shape and size of the burn-through position;

[0036] S2: A support steel plate 1 is provided at the bottom of the burn-through position. The support steel plate 1 extends in the left-right direction and is welded to the rib plate and the outer shell steel plate of the ascending flue.

[0037] S3: Extend the horizontal water jacket 3 into the side wall 6 of the ascending flue in the left and right directions, and connect the horizontal water jacket 3 to the supporting steel plate 1 with bolts;

[0038] S4: Lay refractory bricks 2 layer by layer above the horizontal water jacket 3 in the vertical direction until the height of the refractory bricks 2 in the vertical direction is 400mm-600mm;

[0039] S5: Install the support steel plate 1 on the top refractory bricks 2 in the vertical direction, and repeat the steps of installing the horizontal water jacket 3 and laying the refractory bricks 2 until the refractory bricks 2 are in contact with the top of the burn-through position;

[0040] S6: A vertical water jacket 4 is provided on the side of the refractory brick 2 away from the ascending flue;

[0041] S7: Set up the connection box 5, which is a cube and is located between the supporting steel plate 1 and the unburned position of the ascending flue; weld the connection box 5 to the supporting steel plate 1; the connection box 5 includes a copper tube 51 arranged inside, and the inside of the connection box 5 is sealed by pouring castable material.

[0042] Specifically, refer to Figure 1-Figure 5 The present invention provides a method for hot maintenance of the side wall of the rising flue of a flash furnace, comprising the steps of:

[0043] S1: A support steel plate 1 is manufactured according to the curvature of the burn-through position of the ascending flue side wall 6, a vertical water jacket 4 is manufactured according to the curvature of the burn-through position, and a horizontal water jacket 3 is manufactured according to the thickness of the ascending flue side wall 6. The length of the horizontal water jacket 3 in the left-right direction is greater than the thickness of the ascending flue side wall 6. In the left-right direction, the side of the support steel plate 1 and the horizontal water jacket 3 close to the interior of the ascending flue is flush with the ascending flue side wall 6; in the front-to-back direction, the side of the support steel plate 1 and the horizontal water jacket 3 close to the interior of the ascending flue is in conformity with the shape of the ascending flue side wall 6; the vertical water jacket 4 is in conformity with the shape and size of the burn-through position;

[0044] It should be noted that the support steel plate 1 is customized according to the actual curvature of the side wall 6 of the flash furnace rising flue to ensure that the repair structure fits perfectly with the curvature of the side wall. By precisely matching the curvature shape of the side wall 6 of the flash furnace rising flue, the support steel plate 1 can fit tightly with the side wall structure, thereby achieving efficient support, sealing and thermal isolation functions, and avoiding gaps or stress concentration problems caused by inconsistent curvature, thereby enhancing the overall stability and durability of the repair structure in high temperature environments.

[0045] The design and processing of the supporting steel plate 1 are based on the precise measurement of the actual size and curvature of the side wall 6 of the flash furnace riser. The curvature of the steel plate is customized through machining or heat treatment during the manufacturing process so that its surface curvature is highly consistent with the curvature of the side wall. During the repair process, the supporting steel plate 1 is connected to the side wall 6 of the riser by welding, bolting or slot embedding to ensure that it can withstand the mechanical stress caused by thermal expansion and flue gas scouring during high-temperature operation.

[0046] It is understood that the support steel plate 1 is made of high-temperature resistant alloy steel, which can maintain structural strength and thermal shock resistance in high-temperature environments. It also has good corrosion resistance and can resist long-term erosion of the steel plate by corrosive components in the flue gas. It ensures a continuous and seamless fit between the repair area and the side wall to prevent high-temperature flue gas from leaking through the gap and further damaging the side wall; provides strong mechanical support, creating a reliable foundation for the subsequent installation and fixation of refractory bricks 2; and effectively disperses stress in high-temperature environments to prevent local stress concentration from causing deformation or shedding of the curved steel plate.

[0047] S2: A support steel plate 1 is provided at the bottom of the burn-through position. The support steel plate 1 extends in the left-right direction and is welded to the rib plate and the outer shell steel plate of the ascending flue.

[0048] S3: Extend the horizontal water jacket 3 into the side wall 6 of the ascending flue in the left and right directions, and connect the horizontal water jacket 3 to the supporting steel plate 1 with bolts;

[0049] Optionally, the horizontal water jacket 3 and the supporting steel plate 1 can also be fixed by welding, and a thermal expansion gap can be set at the connection to ensure that the horizontal water jacket 3 and the supporting steel plate 1 form a stable mechanical connection. At the same time, the thermal expansion gap is set to absorb the thermal expansion stress generated by high-temperature operation, thereby avoiding structural damage or deformation caused by thermal stress concentration.

[0050] It should be noted that the bolt connection method is convenient for installation and maintenance, and allows a certain displacement adjustment during operation, which is suitable for structural parts that require regular maintenance; the welding method provides higher connection strength and airtightness, ensuring the stability between the horizontal water jacket 3 and the supporting steel plate 1 under harsh working conditions such as high temperature and vibration.

[0051] It should be noted that a thermal expansion gap, typically 1mm to 5mm, is provided at the connection between the horizontal water jacket 3 and the supporting steel plate 1 to allow the structure to expand freely and unimpeded during high-temperature operation. This gap can be filled with a high-temperature-resistant flexible material (such as expanded graphite gasket or ceramic fiber felt). These materials maintain their flexibility at high temperatures, absorbing thermal expansion displacement while also providing the necessary sealing properties to prevent leakage of high-temperature flue gas or cooling water. The thermal expansion gap absorbs the differential thermal expansion between the horizontal water jacket 3 and the supporting steel plate 1 caused by high temperatures, preventing cracking, shedding, or deformation at the connection due to stress concentration, thereby extending the life of the structure.

[0052] In some optional embodiments, along the left-right direction, the depth of the horizontal water jacket 3 extending into the ascending flue side wall 6 is greater than or equal to the length of the refractory brick 2 .

[0053] It should be noted that the horizontal water jacket 3 is extended into the side wall 6 of the ascending flue in the left and right directions, and the depth of the horizontal water jacket 3 extending into the side wall 6 of the ascending flue is greater than or equal to the length of the refractory brick 2. By accurately matching the size of the refractory brick 2 and the structural requirements inside the flue, it is ensured that the horizontal water jacket 3 can cover the burn-through area and provide an effective cooling function; the horizontal water jacket 3 extending into the interior of the flue body can directly contact the high-temperature gas around the burn-through area, and remove heat through the internal cooling water flow, thereby quickly reducing the temperature of the burn-through area and preventing the high temperature from further spreading to other structures. At the same time, the part of the horizontal water jacket 3 that is not inserted into the flue is connected to the refractory brick 2, providing support and positioning functions for the subsequent layer-by-layer masonry of the refractory brick 2, ensuring that the refractory brick 2 can be firmly attached to the repair area and form a complete thermal insulation protective layer. It effectively improves the cooling efficiency of the burn-through area to avoid further damage to the side wall due to excessive temperature; at the same time, it reduces the time that the refractory bricks 2 are directly exposed to high-temperature flue gas, thereby extending their service life; it provides physical support and guiding functions to ensure that the refractory bricks 2 fit closely with the flue side wall structure during masonry; it continuously removes heat through the circulation of cooling water flow, keeping the repair area at a lower operating temperature and avoiding the accumulation of local thermal stress.

[0054] S4: Lay refractory bricks 2 layer by layer above the horizontal water jacket 3 in the vertical direction until the refractory bricks 2 have a height of 400mm-600mm in the vertical direction;

[0055] It should be noted that the refractory bricks 2 are made of high-strength and high-temperature resistant materials and are laid layer by layer with high-temperature resistant refractory mortar. The high strength and high-temperature resistance of the refractory bricks 2 are utilized to provide reliable thermal insulation and mechanical protection for the repair area in an extremely high-temperature environment. At the same time, the bonding effect of the high-temperature resistant refractory mortar ensures that the refractory bricks 2 can form a stable, airtight insulation structure after being laid layer by layer.

[0056] It should be noted that refractory bricks 2 are made of materials with high strength, high temperature resistance, and thermal shock resistance, such as high-alumina refractory bricks 2, magnesia-chrome bricks, or other refractory materials suitable for the high-temperature environments of flash furnaces. They can maintain good structural integrity under the long-term erosion and thermal stress of high-temperature flue gas, and their tolerance temperature is generally between 1300°C and 1600°C. They can effectively isolate the direct high-temperature effects of the flue gas and prevent further damage to the repaired area.

[0057] It should be noted that the layer-by-layer masonry design of the refractory bricks 2 tightly bonds each layer together using a high-temperature refractory mortar. The mortar is typically made of a high-temperature adhesive material that matches the material of the refractory bricks 2, ensuring excellent bond strength, thermal expansion resistance, and corrosion resistance under high-temperature operating conditions. This layer-by-layer approach ensures that the gaps between each refractory brick 2 are completely filled with mortar, forming a cohesive insulation layer that prevents high-temperature smoke from leaking through the gaps or corroding the repaired area.

[0058] It should be noted that the specific laying height of the refractory bricks 2 can be 400mm, 410mm, 415mm, 420mm, 422mm, 428mm, 430mm, 435mm, 440mm, 445mm, 465mm, 470mm, 486mm, 493mm, 500mm, 510mm, 530mm, 545mm, 575mm, and 600mm. When the laying height of the refractory bricks 2 is greater than 600mm, the refractory bricks 2 are laid too high, which will cause the overall structure to expand more under hot conditions, and the expansion space is limited, which will easily generate large thermal stresses at the brick joints, causing the bricks to crack or peel off; in a high temperature environment, the strength of the refractory bricks 2 will decrease, and laying the bricks too high will aggravate the deformation of the bricks and affect the stability of the side walls; laying the refractory bricks 2 too high will hinder the heat exchange between the cooling water jacket and the high-temperature flue gas, resulting in a decrease in the cooling effect and accelerated damage to the refractory bricks 2. When the masonry height of the refractory bricks 2 is less than 400mm, the refractory bricks 2 are built too low, resulting in insufficient protective layer of the side wall, and the high-temperature flue gas directly washes the side wall, aggravating the erosion and damage of the refractory bricks 2; it will also shorten the overall service life of the side wall; the refractory bricks 2 are built too low, which may lead to insufficient support structure of the side wall and affect the stability of the entire ascending flue.

[0059] It should be added that, along the vertical direction, the refractory bricks 2 are laid layer by layer above the horizontal water jacket 3 until the laying height of the refractory bricks 2 along the vertical direction can be 200mm-1000mm. This embodiment does not make a specific limitation and can be set according to needs during actual operation.

[0060] As can be understood, the integrated insulation structure formed by layering refractory bricks 2 with refractory mortar provides excellent airtightness, preventing smoke leakage. The flexible bonding properties of the refractory mortar allow for a certain degree of thermal expansion, preventing the bricks from falling or loosening. The matching design of the refractory bricks 2 and the refractory mortar exhibits excellent durability and corrosion resistance in high-temperature environments, reducing maintenance cycles and improving operational efficiency.

[0061] In some optional embodiments, expansion joints are provided between adjacent refractory bricks 2 in the vertical direction. The expansion joints are filled with a buffer material and are refractory to high temperatures. The buffer material is ceramic fiber felt or expanded graphite gasket.

[0062] It should be noted that a thermal expansion buffer structure made of high-temperature resistant flexible material is arranged between adjacent refractory bricks 2. The buffer material adopts filling material made of ceramic fiber felt, expanded graphite gasket or flexible refractory material, which can maintain flexibility and absorb thermal expansion stress in a high-temperature environment; the buffer material is fixed in the gap between the bricks by high-temperature resistant mortar or mechanical embedding to ensure that it does not fall off or shift during high-temperature operation.

[0063] It should be noted that ceramic fiber felt has excellent high temperature resistance (temperature resistance range is usually between 1000℃ and 1300℃), good flexibility, and can absorb high temperature expansion stress while providing a certain thermal insulation effect; expanded graphite gasket has good flexibility and plasticity at high temperature, and can adaptively adjust with thermal expansion and contraction, while having excellent air tightness and corrosion resistance; flexible refractory materials, such as aluminum silicate fiber gaskets or other high-temperature flexible materials, have high thermal stability and durability.

[0064] It is understood that the layer-by-layer masonry design of refractory bricks 2 significantly improves the stability and thermal shock resistance of the refractory brick structure in high-temperature environments by providing thermal expansion buffer structures made of high-temperature resistant flexible material between adjacent refractory bricks 2. Through the precise configuration of buffer materials, buffer gaps, and fixing methods, stress concentration caused by thermal expansion during high-temperature operation is alleviated, ensuring the overall structural integrity and long-term performance of the refractory bricks 2.

[0065] In some optional embodiments, the height of the expansion joint is 0.5 mm to 3 mm in the up-down direction.

[0066] Optionally, the height of the expansion joint in the up and down directions can be specifically 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.1mm, 1.3mm, 1.5mm, 1.8mm, 2.1mm, 2.2mm, 2.4mm, 2.5mm, 2.7mm, 2.8mm and 3mm. An expansion joint of 0.5mm to 3mm is reserved between each refractory brick 2 and filled with buffer material to form a flexible connection, thereby providing sufficient displacement space when the brick body expands due to high temperature. The expansion joint provides sufficient thermal expansion space for the brick body during high-temperature operation, avoiding excessive contact stress between the bricks due to obstructed expansion.

[0067] It's important to note that filling the expansion joint with flexible cushioning material creates a flexible connection. The cushioning material absorbs stress during high-temperature expansion while preventing friction damage caused by direct contact between bricks. High-temperature resistant mortar (such as high-alumina refractory mortar) is used in the expansion joint between bricks to secure the cushioning material and maintain its position during high-temperature operation. High-temperature resistant mortar has strong adhesion and thermal stability, making it less susceptible to failure due to high temperatures or thermal cycling.

[0068] S5: Install the support steel plate 1 on the top refractory bricks 2 in the vertical direction, and repeat the steps of installing the horizontal water jacket 3 and laying the refractory bricks 2 until the refractory bricks 2 are in contact with the top of the burn-through position;

[0069] It should be noted that the steps of repeatedly installing the horizontal water jacket 3, laying the refractory bricks 2 and the supporting steel plate 1 form a composite structure of multiple layers of refractory bricks 2 and supporting steel plates 1 in the repair area. Through the synergistic effect of the multi-layer structure, the heat of the high-temperature flue gas is isolated layer by layer, and the mechanical strength and durability of the repair area are enhanced. The design of the multi-layer composite structure can effectively resist thermal shock, flue gas erosion and mechanical stress in high-temperature environments, thereby ensuring the long-term stable operation of the repair area under complex working conditions.

[0070] S6: A vertical water jacket 4 is provided on the side of the refractory brick 2 away from the ascending flue. In the vertical direction, the vertical water jacket 4 extends from a layer of horizontal water jacket 3 to another layer of supporting steel plate 1;

[0071] It should be noted that the vertical water jacket 4 is installed on the side of the refractory brick 2 away from the ascending flue, and the cooling water circulation is used to provide overall heat dissipation protection for the repaired refractory brick 2 and the outer layer of the side wall; the cooling function of the vertical water jacket 4 is used to effectively reduce the temperature of the refractory brick 2 and the outer layer of the side wall, preventing thermal stress concentration and structural performance degradation caused by high temperature. The installation position of the facade water jacket 4 is close to the outer surface of the refractory brick 2 and covers the entire repair area, ensuring that the cooling water can form a uniform circulation flow inside the water jacket, thereby taking away the heat generated by the refractory brick 2 and the outer structure due to the high temperature of the flue gas; the specific functions of the facade water jacket 4 include: directly absorbing the heat outside the refractory brick 2 through the cooling water flow, preventing the high temperature from spreading outward, thereby effectively protecting the outer steel structure and supporting components; providing overall heat dissipation protection for the repair area to avoid local excessive temperature causing the refractory brick 2 to fall off or crack; reducing the thermal expansion effect of the outer layer of the side wall through the cooling effect, reducing the structural damage caused by thermal expansion and contraction during long-term operation; the cooling water circulation system of the facade water jacket 4 is designed to operate independently, and can flexibly adjust the cooling intensity according to the temperature changes in the repair area, thereby achieving precise temperature control. The material of the facade water jacket 4 is usually a high-temperature and corrosion-resistant metal material, generally a copper tube 51, which can operate in a high-temperature environment for a long time. At the same time, its installation method close to the outside of the refractory brick 2 enables it to provide heat dissipation function without affecting the thermal insulation performance of the refractory brick 2.

[0072] It can be understood that the facade water jacket 4 can significantly reduce the overall temperature of the repair area, extend the service life of the refractory bricks 2 and the side wall structure; provide continuous heat dissipation protection to avoid instability in the repair area due to high temperature; reduce thermal damage to external steel structures and supports, and ensure stable operation of the repaired structure in a high temperature environment; improve heat dissipation efficiency through an independent cooling water circulation system, while ensuring the service life of the water jacket.

[0073] It should be noted that the composite structure of the present invention uses a horizontal water jacket 3 as the basic cooling structure for each layer, which is first installed in the repair area. The horizontal water jacket 3 is fixed to the supporting steel plate 1 by bolts or welding. At the same time, thermal expansion gaps are reserved during installation to ensure that the water jacket can expand freely. The cooling water circulation system of the horizontal water jacket 3 operates independently on each layer, which can provide continuous heat dissipation protection for the multi-layer composite structure. Refractory bricks 2 are laid layer by layer on the outside of the horizontal water jacket 3. The refractory bricks 2 are made of high-strength and high-temperature resistant materials and bonded with high-temperature refractory mortar to build a tight insulation layer layer by layer. Each layer of refractory bricks 2 fits tightly with the horizontal water jacket 3 to form an insulation barrier. The thickness and thermal insulation performance of the refractory bricks 2 are enhanced by stacking them layer by layer. A vertical water jacket 4 is installed on the outside of each layer of refractory bricks 2 and fixed to the structure by bolts or welding. The supporting steel plate 1 provides external protection for the refractory bricks 2, effectively preventing the refractory bricks 2 from falling off due to high-temperature flue gas erosion or mechanical stress, while enhancing the mechanical strength and sealing of the repair area.

[0074] By repeating the above steps, the repair area gradually forms a multi-layer composite structure consisting of horizontal water jacket 3, refractory bricks 2, vertical water jacket 4 and supporting steel plate 1. The design of this composite structure has the following beneficial effects:

[0075] Multi-layer thermal insulation performance: The layer-by-layer stacking of refractory bricks 2 in the composite structure can effectively reduce the heat transfer of high-temperature flue gas, forming a strong thermal insulation barrier to protect the repair area and subsequent structures from high temperature. Each layer of horizontal water jacket 3 operates independently, providing continuous heat dissipation for adjacent refractory bricks 2 and supporting steel plates 1 through cooling water circulation, further reducing the overall temperature of the composite structure and preventing material performance degradation caused by high temperature. The multi-layer nested design of the supporting steel plate 1 greatly enhances the overall mechanical strength of the repair area, and can effectively resist flue gas scouring, thermal stress and mechanical loads in high-temperature environments, extending the service life of the repair area. The design of the multi-layer composite structure provides redundant protection. Even if a layer of refractory bricks 2 or supporting steel plates 1 is locally damaged, the other layers can continue to perform insulation, heat dissipation and mechanical protection functions, significantly improving the stability and reliability of the repair area.

[0076] S7: Setting a connection box 5, which is located between the supporting steel plate 1 and the unburned position of the ascending flue; welding the connection box 5 to the supporting steel plate 1; the connection box 5 includes a copper tube 51 arranged inside, and the connection box 5 is sealed by pouring a casting material inside.

[0077] It should be noted that the connecting box 5 is located between the supporting steel plate 1 and the unburned position of the ascending flue; the connecting box 5 is welded to the supporting steel plate 1; the connecting box 5 includes a copper tube 51 arranged inside, and the steel tube can be connected to the water channel to perform secondary cooling on the burn-through repair area, and can also prevent the leakage of flue gas in the gap between the supporting steel plate 1 or the heat-resistant fire brick and the unburned position of the ascending flue side wall 6; the inside of the connecting box 5 is poured with castables for sealing to enhance the sealing performance.

[0078] In some optional embodiments, before laying the refractory bricks 2 layer by layer above the horizontal water jacket 3 , the following step is further included: after the first layer of the horizontal water jacket 3 is installed, the horizontal water jacket 3 is cooled by water.

[0079] It should be noted that the cooling water circulation systems of the horizontal water jacket 3 and the vertical water jacket 4 are independently designed to cool the burn-through area and the area outside the refractory bricks 2, respectively. These independent cooling water circulation systems provide precise heat dissipation protection tailored to different cooling requirements. The horizontal water jacket 3 primarily cools the burn-through portion of the repaired area, while the vertical water jacket 4 dissipates heat throughout the repaired refractory bricks 2 and the exterior of the sidewalls. These independently designed cooling water circulation systems not only improve cooling efficiency but also allow for flexible adjustment of cooling intensity to accommodate varying temperature distributions and heat loads, thereby ensuring temperature control and structural stability in the repaired area. The water cooling systems operate independently, with cooling water flowing from the inlet into the horizontal water jacket 3, evenly distributed through the jacket's flow channels, and then discharged from the outlet. The flow channels are designed in a serpentine or multi-channel pattern to increase the contact area between the cooling water and the jacket's inner wall, improving heat dissipation efficiency. The water circulation system is equipped with a temperature control device to monitor and adjust the cooling water flow rate and temperature in real time, ensuring that the temperature in the burn-through area remains within a safe range.

[0080] Optionally, after the vertical water jacket 4 is provided, the method further includes: providing a steel beam on the side of the vertical water jacket 4 away from the refractory bricks 2 , the steel beam extending in the up and down directions, and both ends of the steel beam being welded to the supporting steel plate 1 .

[0081] It is understandable that by adopting innovative structural design and leak repair methods in a hot state, the burnt-through area of ​​the ascending flue side wall 6 can be completely repaired while the flash furnace continues to operate, effectively resolving the side wall reddening problem. The core of the repair solution is a multi-layer composite structure design that combines the independent cooling systems of the horizontal water jacket 3 and the vertical water jacket 4 with the layer-by-layer refractory brick 2 structure, supplemented by the reinforcement and sealing treatment of the supporting steel plate 1. The horizontal water jacket 3 and the vertical water jacket 4 provide efficient heat dissipation protection for the repair area. The layer-by-layer refractory brick 2 adopts a thermal expansion buffer structure design, significantly improving the heat resistance, erosion resistance, and thermal stress adaptability of the repaired area. At the same time, the combination of the supporting steel plate 1 and the high-temperature sealing material enhances the airtightness and mechanical strength of the structure. Compared with traditional methods, this method can completely repair the burnt-through area without shutting down the furnace for cold repair, significantly reducing production downtime and economic losses. The safety and operational stability of the repaired furnace body are fully guaranteed without affecting the normal production and operation of the flash furnace.

[0082] Example 1

[0083] Reference Figure 2 and Figure 3 , which is an example of a hot maintenance method for the side wall of the rising flue of a flash furnace according to the present invention. The present invention does not specifically limit the number of layers of the supporting steel plate 1, horizontal water jacket 3, vertical water jacket 4 and refractory bricks 2.

[0084] A support steel plate 1 is made according to the curvature of the burn-through position of the ascending flue side wall 6, a vertical water jacket 4 is made according to the curvature of the burn-through position, and a horizontal water jacket 3 is made according to the thickness of the ascending flue side wall 6. The length of the horizontal water jacket 3 in the left-right direction is greater than the thickness of the ascending flue side wall 6;

[0085] A layer of supporting steel plate 1 is set at the bottom of the burn-through position, and the first layer of horizontal water jacket 3 is extended into the side wall 6 of the ascending flue in the left and right direction and cooled with water. Then, refractory bricks 2 are laid layer by layer above the horizontal water jacket 3 in the up and down direction. The height of the refractory wall is 400 mm. A second layer of supporting steel plate 1 is set on the refractory bricks 2 on the top layer, and a second layer of horizontal water jacket 3 is set. Then, refractory bricks 2 are laid. A total of three layers of horizontal water jackets 3 and three layers of supporting steel plates 1 are set; a vertical water jacket 4 is set on the side of the refractory bricks 2 away from the ascending flue, and three layers of the vertical water jacket 4 are also set in the up and down direction; a connecting box 5 is set at the angle between the supporting steel plate 1 and the unburned position of the ascending flue.

[0086] It can be seen from the above embodiments that the hot maintenance method for the side wall of the ascending flue of a flash furnace provided by the present invention achieves at least the following beneficial effects:

[0087] The present invention provides a method for hot maintenance of the side wall of a flash furnace ascending flue, comprising the steps of: manufacturing a supporting steel plate according to the curvature of a burn-through position of the ascending flue side wall, manufacturing a vertical water jacket according to the curvature of the burn-through position, and manufacturing a horizontal water jacket according to the thickness of the ascending flue side wall; then combining the independent cooling systems of the horizontal water jacket and the vertical water jacket with a layer-by-layer refractory brick structure, supplemented by reinforcement and sealing treatment of the supporting steel plate. The horizontal water jacket and the vertical water jacket provide efficient heat dissipation protection for the repair area. The refractory bricks laid layer by layer adopt a thermal expansion buffer structure design, which significantly improves the heat resistance, erosion resistance and thermal stress adaptability of the repair area; the structure of the supporting steel plate and the connecting box enhances the air tightness and mechanical strength of the structure. Through the multi-layer composite structure design and leak repair method under hot state, the burned-through parts of the side wall of the ascending flue can be completely repaired while the flash furnace is continuously running, and the redness problem of the side wall can be effectively solved. Compared with the traditional method, this method can completely repair the burned-through parts without stopping the furnace for cold repair, which greatly reduces production downtime and economic losses. The safety and operation stability of the furnace body after repair are fully guaranteed, and will not affect the normal production and operation of the flash furnace.

[0088] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for hot maintenance of the side wall of the rising flue of a flash furnace, characterized in that: Including steps: A supporting steel plate is manufactured according to the curvature of the burn-through position of the ascending flue side wall, a vertical water jacket is manufactured according to the curvature of the burn-through position, and a horizontal water jacket is manufactured according to the thickness of the ascending flue side wall. The length of the horizontal water jacket in the left-right direction is greater than the thickness of the ascending flue side wall. Along the left-right direction, the side of the supporting steel plate and the horizontal water jacket close to the interior of the ascending flue is flush with the ascending flue side wall; along the front-to-back direction, the side of the supporting steel plate and the horizontal water jacket close to the interior of the ascending flue is in conformity with the shape of the ascending flue side wall; the vertical water jacket is in conformity with the shape and size of the burn-through position; The support steel plate is arranged at the bottom of the burn-through position, the support steel plate extends in the left-right direction, and the support steel plate is welded to the rib plate and the outer shell steel plate of the ascending flue; Extend the horizontal water jacket into the side wall of the ascending flue in the left-right direction, and connect the horizontal water jacket to the supporting steel plate through bolts; After the first layer of the horizontal water jacket is installed, the horizontal water jacket is cooled by water; Laying refractory bricks layer by layer above the horizontal water jacket in the vertical direction until the height of the refractory bricks in the vertical direction is 400 mm to 600 mm; Arranging the support steel plate on the refractory bricks on the top layer along the vertical direction, and repeating the steps of arranging the horizontal water jacket and laying refractory bricks until the refractory bricks are in contact with the top of the burn-through position; The vertical water jacket is provided on the side of the refractory brick away from the ascending flue; A connection box is provided, which is a cube; the connection box is located between the support steel plate and the unburned position of the ascending flue; the connection box is welded to the support steel plate; the connection box includes a copper tube provided inside, and the interior of the connection box is sealed by pouring castable material.

2. The hot maintenance method for the side wall of the ascending flue of a flash furnace according to claim 1 is characterized in that: Along the left-right direction, the depth of the horizontal water jacket extending into the side wall of the ascending flue is greater than or equal to the length of the refractory bricks.

3. The hot maintenance method for the side wall of the ascending flue of a flash furnace according to claim 1 is characterized in that: After the vertical water jacket is set, it also includes: setting a steel beam on the side of the vertical water jacket away from the refractory bricks, the steel beam is a hollow cube inside, extends in the up and down direction, and the two ends of the steel beam are welded to the supporting steel plate.

4. The hot maintenance method for the side wall of the ascending flue of a flash furnace according to claim 1 is characterized in that: Along the up and down direction, expansion joints are provided between adjacent refractory bricks. The expansion joints are filled with a buffer material and are refractory to high temperatures. The buffer material is a ceramic fiber felt or an expanded graphite gasket.

5. The hot maintenance method for the side wall of the ascending flue of a flash furnace according to claim 4 is characterized in that: Along the up-down direction, the height of the expansion joint is 0.5 mm to 3 mm.

Images