A kind of roaster fireway cooling frame can offset compensation outrigger

Abstract

The utility model relates to a roasting furnace cooling technical field, concretely is a kind of roasting furnace fire channel wall cooling frame can offset compensation stretch leg, including cooling frame branch pipe and fire channel mouth sealing element that are sequentially arranged from top to bottom, the stretch leg being arranged between cooling frame branch pipe and fire channel mouth sealing element, multiple long chains are equidistantly provided between cooling frame branch pipe and fire channel mouth sealing element along the circumference of fire channel mouth sealing element, and the stretch leg includes cylindrical refractory cloth and multiple cage bones;The both ends of refractory cloth are connected with cooling frame branch pipe and fire channel mouth sealing element respectively, and multiple cage bones are equidistantly sleeved on the length direction of refractory cloth.Long chain between cooling frame branch pipe and fire channel mouth sealing element, through natural droop or slight stretch, self-adapting displacement up and down caused by thermal expansion and contraction of fire channel wall, avoid stretch leg to bear axial tension / pressure, protect refractory cloth and cage bone from being damaged.Short chain flexible swing along with the lateral deformation of fire channel wall, drive cage bone and high-silicon oxygen refractory cloth synchronous slight deformation, fully absorb the offset amount in left and right / forward and backward direction.

Description

Technical Field

[0001] This utility model relates to the field of roasting furnace cooling technology, specifically to a roasting furnace fire channel wall cooling rack with offset compensating extension legs. Background Technology

[0002] In the field of calcination furnace cooling technology, the calcination furnace, as the core equipment in the production of anode carbon blocks, is prone to longitudinal (vertical) displacement and lateral (left-right and front-back) deformation of its fire channel walls during long-term high-temperature operation due to factors such as thermal expansion and contraction, furnace body settlement, and material scorching deformation. To ensure the normal calcination and subsequent cooling effect of the anode carbon blocks, the cooling rack, as a key cooling device, needs to achieve a sealed connection with the fire channel opening through specific components, while also possessing the ability to adaptively compensate for the displacement of the fire channel wall deformation. If this connecting component cannot effectively absorb the deformation, it will lead to cold air leakage causing system negative pressure loss, incomplete combustion of volatiles, or obstruction of the delivery of cooling media (such as cooling air or coolant), resulting in poor anode cooling, excessively high furnace exit temperature, and ultimately causing quality problems such as anodizing and cracking.

[0003] In the prior art, there are existing technical solutions for the connection compensation requirements between the fire channel and the furnace surface equipment in roasting furnaces. For example, Chinese Patent No. CN219913957U discloses a furnace surface expansion joint. The core structure of this furnace surface expansion joint includes a sealing seat ring, an upper pipe body, a lower pipe body, and a fireproof hose. Through chain-assisted positioning and flexible deformation of the hose, it can adapt to a certain degree of fire channel deformation, ensuring the alignment of the furnace surface equipment and the fire channel holes, which plays a certain role in improving the anode roasting effect. However, when this furnace surface expansion joint is directly applied to the cooling rack branch pipe and the fire channel opening seal connection extension leg of the cooling rack on the fire channel wall of the roasting furnace, some defects still exist, making it difficult to meet the specific working requirements of the cooling rack: 1. Insufficient Support Stability: The fireproof flexible hose of this expansion joint relies solely on the flexibility of its multi-layered structure and the tension of the chain to maintain its shape, without a dedicated support component. When used in cooling rack extensions, the cooling rack branch pipes need to continuously deliver cooling media, and the extensions are exposed to high-temperature environments for extended periods. The hose is prone to sagging and wrinkling due to its own weight, media pressure, and thermal deformation, leading to increased sealing gaps. This not only affects the stable delivery of the cooling media but may also cause high-temperature smoke leakage due to insufficient hose fit, exacerbating component wear.

[0004] 2. Limited Multi-directional Offset Compensation Capability: The chain of this expansion joint is only installed between mounting ring I and mounting ring II, and its main function is to assist in accommodating longitudinal (vertical) displacement. Compensation for lateral (left-right, front-back) displacement relies on the deformation of the fireproof hose itself. When the fire channel wall undergoes significant lateral deformation due to long-term use, resulting in significant lateral relative displacement between the cooling rack branch pipe and the fire channel opening seal, the deformation capacity of the hose and the swing allowance of the chain cannot fully absorb the displacement, easily causing hose tearing, joint detachment, and consequently cooling failure, leading to quality problems such as anodizing and cracking.

[0005] 3. Insufficient durability and adaptability: Although the multi-layer fireproof flexible hose of this expansion joint has certain high temperature resistance, its structural design is designed for low-frequency displacement scenarios of smoke exhaust racks and blower racks, rather than the working conditions where the extension legs of the cooling rack need to frequently adapt to multi-directional displacement. In addition, it lacks a protective support structure for the hose. Long-term high-frequency deformation is prone to fatigue fracture of the inner stainless steel soft mesh and wear of the outer fireproof cloth, which greatly shortens the service life and cannot meet the requirements of long-term stable operation of the cooling rack.

[0006] In summary, the existing furnace surface expansion joint (CN219913957U) cannot effectively solve the core requirements of the cooling rack extension legs of the roasting furnace fire channel wall for "multi-directional offset compensation, high-temperature structural stability, long-term durability and sealing". There is an urgent need to design an offset compensation extension leg that is specially adapted to the cooling rack to fill the gap in the existing technology and ensure the cooling effect of the roasting furnace and the quality of the anode carbon blocks. Utility Model Content

[0007] The purpose of this invention is to provide an offset compensating extension leg for the cooling rack of the fire channel wall of a roasting furnace, in order to solve the problems mentioned in the prior art in the background.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an offset compensating extension leg for a cooling rack of a calcining furnace fire channel wall, comprising a cooling rack branch pipe and a fire channel opening seal arranged sequentially from top to bottom, and an extension leg disposed between the cooling rack branch pipe and the fire channel opening seal. Multiple long chains are equidistantly arranged along the circumference of the fire channel opening seal between the cooling rack branch pipe and the fire channel opening seal. The extension leg comprises a cylindrical refractory cloth and multiple cages. Both ends of the refractory cloth are respectively connected to the cooling rack branch pipe and the fire channel opening seal, and the multiple cages are equidistantly sleeved along the length of the refractory cloth.

[0009] Furthermore, multiple short chains are provided at equal intervals along the circumference between every two adjacent cage bones.

[0010] Furthermore, the long chains and short chains are arranged alternately.

[0011] Furthermore, the refractory cloth is specifically a refractory fiber cloth.

[0012] Furthermore, both ends of the fire-resistant cloth are fixed to the bottom end of the cooling rack branch pipe and the upper end of the fire channel seal by hose clamps.

[0013] This utility model addresses the shortcomings of existing furnace surface expansion joints in the background technology, such as unstable support, insufficient multi-directional compensation, and poor sealing durability. Through a structural design of cage support, double chain compensation, and high-temperature resistant sealing, it achieves precise adaptation to the scenario of the cooling rack of the fire channel wall in a roasting furnace. The specific beneficial effects are as follows: 1. This utility model features multiple cages evenly spaced on the outer side of the cylindrical refractory cloth with extended legs. The weight of both ends of the refractory cloth is supported by the cooling rack branch pipes and the fire channel seals. This design solves the problem of sagging and wrinkling due to self-weight and medium pressure caused by the flexible hose and chain pulling alone in the CN219913957U furnace surface expansion joint. In practical applications, the cages provide uniform rigid support, ensuring that the refractory cloth always maintains its cylindrical shape and avoiding narrowing or blockage of the cooling medium delivery channel due to structural deformation. At the same time, it eliminates sealing gaps caused by folds in the refractory cloth, effectively preventing high-temperature flue gas from leaking from the gaps, reducing wear on the cooling rack branch pipes and fire channel seals, and ensuring stable operation of the cooling system.

[0014] 2. This utility model overcomes the limitation of CN219913957U, which relies solely on a single-level chain for limited longitudinal compensation, by employing a dual-layer compensation structure of long and short chains. The long chain between the cooling rack branch pipe and the fire channel opening seal can naturally droop or be slightly stretched to adapt to the vertical displacement caused by the thermal expansion and contraction of the fire channel wall, preventing the extension legs from bearing axial tension / compression and protecting the refractory cloth and cage from damage. The short chain between adjacent cages can flexibly swing with the lateral deformation of the fire channel wall, causing the cage and high-silica refractory cloth to undergo synchronous slight deformation, fully absorbing the offset in the left / right / front / back directions. This design can cover the combined deformation of longitudinal settlement and lateral misalignment commonly seen in fire channel walls during long-term use, avoiding problems such as hose tearing and interface detachment caused by insufficient lateral compensation, and ensuring that the cooling rack and fire channel opening are always aligned and sealed.

[0015] 3. This utility model features targeted optimizations in sealing and temperature resistance design, surpassing the multi-layer fireproof hose structure of CN219913957U. The fire-resistant cloth in the core of the extension leg is made of high-silica fire-resistant fiber cloth, with a temperature resistance range of 1000-1700℃, far exceeding the 550℃ upper limit of the outer double-sided coated silicon-titanium fireproof cloth of CN219913957U. It can withstand the high-temperature environment of the furnace fire channel opening for a long time, avoiding carbonization or damage to the cloth surface caused by high temperature. The two ends of the fire-resistant cloth are fixed to the support boss by hose clamps. Compared with the conventional connection between the hose and the pipe body of CN219913957U, the sealing fit is higher, which can effectively prevent the leakage of cooling medium and the infiltration of high-temperature flue gas, reducing the loss of cooling efficiency and corrosion of components.

[0016] 4. This utility model solves the problems of fatigue fracture of the inner stainless steel soft mesh and wear of the outer fabric surface that are prone to occur due to high-frequency deformation in CN219913957U by using a protective structure and corrosion-resistant materials. The cage not only provides support, but also serves as a protective skeleton for the fire-resistant cloth, preventing the impact of cooling medium or vibration of the fire channel wall from directly acting on the cloth surface, thus reducing cloth wear; both long and short chains are made of 304 stainless steel, and the short chains are staggered with the long chains to avoid mutual friction during offset compensation; at the same time, the chains are fixed by cotter pins, and the connection stability is much higher than that of conventional hook-type fixing, which can withstand the tensile stress caused by high-frequency deformation for a long time, extending the overall service life of the extension legs. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present utility model; Figure 2 This is a front view of the present utility model.

[0018] In the diagram: 1. Cooling rack branch pipe; 2. Fire duct seal; 3. Long chain; 4. Fire-resistant cloth; 5. Cage; 6. Short chain. Detailed Implementation

[0019] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Figure 1-2 As shown, this utility model discloses a displacement-compensating extension leg for a calcining furnace fire channel wall cooling rack, designed to achieve multi-directional displacement compensation in both lateral (left and right, front and back) and longitudinal (up and down) directions. The extension leg refers to a flexible connecting component that connects the cooling rack branch pipe and the fire channel opening seal, used to compensate for relative displacement and maintain a seal. Its overall structure is arranged in layers from top to bottom, with the core consisting of three main components: the cooling rack branch pipe 1, the extension leg, and the fire channel opening seal 2. A long chain 3 connects the cooling rack branch pipe 1 and the fire channel opening seal 2, while a short chain 6 connects the internal structure of the extension leg, forming a complete displacement compensation mechanism. The extension leg, as the compensation core, is composed of a cylindrical refractory cloth 4 and multiple cages 5. Each component is assembled using a specific connection method to ensure the synergistic achievement of high-temperature resistance and displacement compensation effect. The specific structure of each component is as follows: The cooling rack branch pipe 1 is made of 304 stainless steel, which has excellent high temperature resistance (long-term temperature resistance ≤800℃) and corrosion resistance, making it suitable for the working environment of the roasting furnace. The model uses industrial-grade seamless steel pipe with an outer diameter of 100mm, a wall thickness of 4mm, and a length set according to the overall layout of the roasting furnace cooling rack (usually 300-500mm) to ensure that it can stably transport the cooling medium (such as cooling air or coolant). The cooling rack branch pipe 1 is welded or connected to the bottom of the cooling rack via a flange. Four 304 stainless steel connecting rings (inner diameter 12mm, outer diameter 16mm, thickness 3mm) are welded at equal intervals along the circumference on the outer wall of the bottom end of the cooling rack branch pipe 1. The distance between the center of the connecting ring and the bottom end face of the cooling rack branch pipe 1 is 20mm, which is used to fix the subsequent long chain 3. At the same time, a 304 stainless steel support boss (width 10mm, thickness 3mm) is welded 10mm below the connecting ring to support the top of the fireproof cloth 4 and prevent the fireproof cloth 4 from slipping due to its own weight or medium pressure.

[0020] The fire duct seal 2 is made of high-temperature resistant ceramic fiber composite material. This material has a temperature resistance range of 1200-1400℃ and good sealing elasticity, which can meet the high-temperature sealing requirements of the fire duct. The structure is designed as a ring, with specific specifications of an inner diameter of 120mm (matching the inner diameter of the fire duct of the roasting furnace), an outer diameter of 150mm (ensuring that the edge of the fire duct is covered to achieve a seal), and a thickness of 25mm. A sealing groove with a width of 5mm and a depth of 3mm is opened on the inner side of the ring to fit with the edge of the fire duct and improve the sealing effect. On the upper end face of the fire channel seal 2, four 304 stainless steel connecting rings of the same specifications as the bottom end of the cooling rack branch pipe 1 are welded at equal intervals along its circumference. The circumferential distribution of the connecting rings corresponds one-to-one with the connecting rings at the bottom end of the cooling rack branch pipe 1 (i.e., coaxial), for fixing the lower end of the long chain 3. At the same time, 10mm inside the connecting ring on the upper end face, a 304 stainless steel support boss of the same specifications as the support boss at the bottom end of the cooling rack branch pipe 1 is welded to support the bottom end of the fireproof cloth 4.

[0021] The extension leg is the core functional component for achieving offset compensation. It achieves lateral offset compensation by combining the flexibility of the tubular fireproof cloth 4 with the support of the cage bone 5 and the mobility of the short chain 6.

[0022] The cylindrical refractory cloth 4 is made of high silica-oxygen refractory fiber cloth, model GS-1. This material has a temperature resistance range of 1000-1700℃, a tensile strength ≥3MPa, and good flexibility (can be repeatedly folded without cracking), and can adapt to slight deformation at high temperatures. The cloth thickness is 1.5mm, the inner diameter of the cylindrical structure is 100mm (matching the outer diameter of the bottom end of the cooling rack branch pipe 1 and the outer diameter of the upper end support boss of the fire channel seal 2), and the length is 250mm (set according to the distance between the cooling rack and the fire channel, with a longitudinal compensation margin of 10-15mm). The top of the fire-resistant cloth 4 is fitted onto the outside of the support boss at the bottom of the cooling rack branch pipe 1, and the bottom is fitted onto the outside of the support boss at the top of the fire channel seal 2. Both the top and bottom fitting positions are fixed with 304 stainless steel hose clamps. The hose clamps are American-style hose clamps with a width of 14mm and a bolt specification of M8. When tightening, a torque of 8-10 N·m is applied by a torque wrench to ensure that the fire-resistant cloth 4 fits tightly with the support boss, preventing high-temperature flue gas from leaking from the gaps. At the same time, the stainless steel material of the hose clamps can prevent high-temperature corrosion.

[0023] The cage ribs 5 are made of Q235 low-carbon steel, which has sufficient rigidity (yield strength ≥235MPa) to support the refractory cloth 4 and is reasonably priced. The structure is designed as a ring, with specific specifications of an inner diameter of 98mm (2mm smaller than the outer diameter of the refractory cloth 4 to ensure a tight fit on the outside of the refractory cloth 4), an outer diameter of 110mm, and a thickness of 3mm. Four 5mm diameter connecting holes (for fixing short chains 6) are equidistantly opened along the circumference of the ring. Five cage ribs 5 are equidistantly arranged along the length of the refractory cloth 4, with equal vertical spacing between adjacent cage ribs 5 (to ensure uniform support and prevent the refractory cloth 4 from sagging in the middle). After the cage ribs 5 are fitted onto the outside of the refractory cloth 4, they are fixed to the position of the refractory cloth 4 with high-silica refractory fiber binding tape (10mm wide, 1mm thick, 200mm long, temperature resistant 1000-1700℃, matching the refractory cloth material) to prevent the cage ribs 5 from sliding along the length of the refractory cloth 4 during offset compensation.

[0024] The long chain 3 is made of 304 stainless steel precision chain, model 06B, single-row roller chain with a pitch of 9.525mm. The length of a single chain link is 12mm and the diameter is 3mm. The total length of each long chain 3 is 260mm (10mm longer than the vertical distance between the cooling rack branch pipe 1 and the fire duct seal 2, with a longitudinal compensation allowance). A total of 4 long chains 3 are set, which are evenly distributed along the circumference of the cooling rack branch pipe 1 and the fire duct seal 2 (the central angle between adjacent long chains is 90°). The upper end of the long chain 3 is fixed to the connecting ring at the bottom of the cooling rack branch pipe 1 by a Φ4mm 304 stainless steel cotter pin. After the cotter pin is inserted into the hole between the connecting ring and the chain pin shaft, the pin end is bent open by 90° to prevent it from falling off. The lower end of the long chain 3 is fixed to the corresponding connecting ring at the upper end of the fire duct seal 2 in the same way. After assembly, the long chain 3 hangs down naturally without any tension, ensuring that when the cooling rack branch pipe 1 or the fire duct seal 2 moves up or down, the long chain 3 can compensate for the longitudinal displacement through its own length margin and swing.

[0025] The short chain 6 is made of 304 stainless steel miniature chain, model 6.35mm pitch single row chain (chain number 04B), the length of a single chain link is 8mm and the diameter is 2mm, the total length of each short chain 6 is 85mm (5mm longer than the vertical distance between adjacent cage bones 5, leaving room for lateral movement); 4 short chains 6 are set between every two adjacent cage bones 5, evenly distributed along the circumference of the cage bone 5 (the central angle between adjacent short chains is 90°), and the circumferential distribution of the short chains 6 is staggered from that of the long chains 3 (that is, the short chains are located on the vertical line between two long chains), forming a three-dimensional compensation structure. The upper end of the short chain 6 is fixed in the connecting hole of the upper cage 5 by a Φ3mm 304 stainless steel cotter pin, and the lower end is fixed in the corresponding connecting hole of the lower cage 5 in the same way. After assembly, the short chain 6 is in a slightly loose state, allowing lateral relative displacement between adjacent cages 5. When the furnace fire channel wall causes the cooling rack branch pipe 1 or the fire channel seal 2 to shift in the left and right or front and back directions, the short chain 6 can adapt to the displacement by swinging, thereby causing the cage 5 and the refractory cloth 4 to deform synchronously, thus achieving lateral displacement compensation.

[0026] The specific operating steps for this device are as follows: 1. Longitudinal offset compensation: When the calcining furnace is in operation, the cooling rack support pipe 1 may shift vertically due to thermal expansion and contraction, or the fire channel seal 2 may shift longitudinally due to furnace deformation. The long chain 3 between the cooling rack support pipe 1 and the fire channel seal 2 can adapt to the displacement using its own length margin (10mm). When the displacement is upward, the chain is slightly stretched; when the displacement is downward, the chain naturally sags more, preventing the extension legs from being subjected to axial tension or pressure, and protecting the refractory cloth 4 and cage 5 from damage.

[0027] 2. Lateral offset compensation: When the fire channel wall of the roasting furnace undergoes lateral deformation (left-right or front-back direction), causing the cooling rack branch pipe 1 or the fire channel opening seal 2 to shift laterally, the short chain 6 between adjacent cage bones 5 inside the extension leg can swing flexibly, allowing slight lateral relative displacement between the cage bones 5; at the same time, the high silica refractory cloth 4 has good flexibility and can deform synchronously with the displacement of the cage bone 5, thereby absorbing the lateral offset, avoiding cracking of the extension leg or failure of the seal due to rigid connection, and ensuring the stability of the cooling effect of the cooling rack and the sealing performance of the fire channel opening.

Claims

1. A countersunk extension leg for a cooling rack on a fire channel wall of a roasting furnace, comprising a cooling rack branch pipe (1) and a fire channel opening seal (2) arranged sequentially from top to bottom, and an extension leg disposed between the cooling rack branch pipe (1) and the fire channel opening seal (2), wherein a plurality of long chains (3) are equidistantly arranged along the circumference of the fire channel opening seal (2) between the cooling rack branch pipe (1) and the fire channel opening seal (2), characterized in that, The extension leg includes a cylindrical fire-resistant cloth (4) and multiple cage bones (5); the two ends of the fire-resistant cloth (4) are respectively connected to the cooling rack branch pipe (1) and the fire channel seal (2), and the multiple cage bones (5) are equidistantly sleeved on the length direction of the fire-resistant cloth (4).

2. The leg extension as described in claim 1, characterized in that, Between each two adjacent cage bones (5), there are multiple short chains (6) equidistantly spaced along their circumference.

3. The leg extension as described in claim 2, characterized in that, The long chain (3) and the short chain (6) are arranged at intervals.

4. The leg extension as described in claim 2, characterized in that, The refractory cloth (4) is specifically a refractory fiber cloth.

5. The leg extension as described in claim 1, characterized in that, Both ends of the fire-resistant cloth (4) are fixed to the bottom end of the cooling rack branch pipe (1) and the top end of the fire channel seal (2) by hose clamps.

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