Low-heat-accumulation high-temperature-resistant wood oxygen blowing pipe

Abstract

The application discloses a low-heat-accumulation high-temperature-resistant wood oxygen blowing pipe which can prevent hard blocks from falling off, and belongs to the technical field of oxygen blowing pipes. The wood sleeve is subjected to high-temperature treatment, and mainly radiates heat outward in a high-temperature environment; after carbonization, only powdery carbonization products are generated, and no hard block-shaped products fall off. The oxygen blowing pipe has low heat accumulation and fast heat dissipation, and can delay the melting loss of the metal pipe; meanwhile, the hard block-shaped products can be prevented from falling into the melt, impurity pollution is reduced, and the service life is long; the wood pipe fittings can be spliced in sections, and the wood pipe fittings are simple to obtain and process and controllable in cost.

Description

Technical Field

[0001] This invention relates to the field of high-temperature industrial furnace pipe fittings technology, specifically to a low-heat-storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe, suitable for oxygen blowing and supply processes in metallurgical smelting furnaces, refining furnaces, submerged arc furnaces, and other equipment. Background Technology

[0002] Currently, the mainstream structure of oxygen blowing pipes used in the metallurgical industry consists of a metal pipe with an outer layer of sintered hard refractory material. This structure has several inherent defects: First, the sintered refractory material is hard and brittle, and is prone to cracking and chipping under high-temperature thermal expansion and contraction, slag erosion, and mechanical vibration. The detached hard fragments enter the molten metal in the furnace, introducing a large amount of impurities and affecting product quality. Second, the refractory material has a strong heat storage capacity, continuously absorbing and storing heat, which is constantly conducted to the internal metal pipe, accelerating the high-temperature erosion of the metal matrix. This results in a rapid consumption rate of the oxygen blowing pipe, frequent replacement, and increased production costs. Third, the preparation of the sintered refractory layer requires high-temperature sintering equipment, which involves a complex processing procedure and high energy consumption.

[0003] Existing wooden oxygen blowing pipes all require processing from a single piece of solid wood. Long-length pipes are difficult to source, have a low yield, and are relatively expensive to process. At the same time, conventional wooden pipes are not treated with high-temperature resistance reinforcement, making them easy to be ignited and burned by high-temperature flames. They also have poor erosion resistance and cannot be used stably for a long time. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a low heat storage, anti-scraping, high temperature resistant wooden oxygen blowing pipe, which has excellent heat dissipation, high temperature resistance, and anti-scraping performance, reduces the amount of impurities introduced, and extends service life; at the same time, it supports the segmented splicing of wooden pipes, lowers the threshold for material sourcing and processing, simplifies the production process, and controls manufacturing costs.

[0005] A low heat storage, anti-falling block, high temperature resistant wooden oxygen blowing pipe, characterized in that it includes a wooden sleeve 1, and a metal tube 2 is provided inside the wooden sleeve 1; The wooden sleeve 1 is a wooden sleeve 1 that has undergone high temperature resistance treatment; so that the wooden sleeve 1 mainly dissipates heat outward in a high temperature environment, and only produces powdery carbonized material after high temperature carbonization, without hard block falling off.

[0006] The advantages of this invention are as follows: 1. Low heat storage and active heat dissipation, delaying metal pipe melting and erosion: The heat storage capacity of wooden sleeves is far lower than that of traditional refractory materials. They do not accumulate heat at high temperatures and can continuously dissipate heat to the outside, effectively blocking the conduction of heat to the internal metal pipes, greatly slowing down the melting rate of the metal pipes and extending the overall service life.

[0007] 2. Completely solve the problem of flaking and reduce impurity contamination: Abandon the hard and brittle sintered refractory layer. Wooden parts only carbonize and burn at high temperatures, generating powdery ash. There is almost no hard block falling off, avoiding fragments from entering the melt and generating impurities, thus ensuring the quality of metallurgical products.

[0008] 3. High-temperature modification and strengthening to improve the service life of wooden sleeves: The wooden sleeves are soaked and cured in high-temperature resistant impregnation liquid and / or coated with fire-resistant coatings on the inner and outer surfaces, forming an inorganic protective film inside and on the surface of the wood, which significantly improves the flame retardancy, high temperature resistance and flame erosion resistance, and solves the defects of ordinary wooden pipes that are easy to ignite and burn.

[0009] 4. Supports segmented splicing, making material sourcing and processing more convenient: Wooden sleeves can be formed by splicing multiple pipe segments, eliminating the need to purchase and process extra-long solid wood. The yield rate of raw materials is high and the difficulty of sourcing materials is low, which greatly reduces the production threshold and cost of long-size pipe fittings.

[0010] 5. Wide range of material selection: Taking metal pipes as an example, there is a wide range of material options to suit different application needs. Specifically, metal pipes can be made of various commonly used metal materials such as steel, aluminum, and copper. The selection can be flexible based on cost, thermal conductivity, and strength requirements, resulting in a wider range of applications. Wooden structures are also flexible in form and adaptable to various working conditions. Specifically, wooden sleeves 1 can be either a single, integrated piece or segmented splicing, while metal pipes 2 can be continuous or segmented with joints, allowing for flexible combinations to adapt to different lengths and working conditions.

[0011] 6. Simple process and good mass production: No large-scale high-temperature sintering equipment is required. It only adopts conventional processes such as soaking, drying, brushing, splicing and assembly. Raw materials are readily available and processing costs are low, making it suitable for large-scale production and promotion.

[0012] 7. Low maintenance cost and reusable metal tubes: The wooden sleeve 1 can be replaced separately after carbonization and wear, while the internal metal tube 2 can be retained for continued use, effectively reducing long-term usage costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a schematic diagram of the structure of Example 2; Figure 3 This is a schematic diagram of the structure of Example 3.

[0014] Labeling explanation: 1. Wooden sleeve, 2. Metal pipe, 21. Metal sleeve joint, 3. Fire-resistant coating. Detailed Implementation

[0015] like Figure 1-3As shown: A low heat storage, anti-falling block, high temperature resistant wooden oxygen blowing pipe includes a wooden sleeve 1, and a metal tube 2 is provided inside the wooden sleeve 1; wherein, the wooden sleeve 1 is a wooden sleeve 1 that has been treated with high temperature resistance; so that the wooden sleeve 1 mainly dissipates heat outward in a high temperature environment, and only produces powdery carbonized material after high temperature carbonization, without hard block falling off.

[0016] This invention uses wood as the main structure of the oxygen blowing pipe, fully utilizing the natural characteristics of wood's low heat storage coefficient and poor thermal conductivity. In a high-temperature oxygen blowing environment, the wooden sleeve 1 does not accumulate heat and can quickly dissipate the absorbed heat to the outside, thereby effectively blocking the continuous conduction of heat to the internal metal pipe 2 and significantly slowing down the high-temperature melting process of the metal pipe 2. At the same time, the wood gradually carbonizes and burns at high temperatures, and the carbonization products are loose, powdery ash, which does not produce the hard, blocky flakes of traditional refractory materials, fundamentally solving the technical problem of flakes contaminating the molten metal.

[0017] Metal pipe 2 serves as the core ventilation carrier of the oxygen blowing pipe, ensuring the structural strength and oxygen supply stability of the pipeline. At the same time, with the help of the heat insulation and heat dissipation protection of the outer wooden sleeve 1, the working temperature of metal pipe 2 is significantly reduced, and its service life is greatly extended.

[0018] Preferably, the wooden sleeve 1 is a continuous wooden tube, and a continuous metal tube 2 is provided inside the wooden sleeve 1.

[0019] The structure employs a continuous, integrated wooden sleeve combined with a continuous metal pipe, resulting in good overall integrity and high structural strength. It is suitable for applications with short pipe lengths or readily available raw materials. The metal pipe 2 is installed entirely inside the wooden sleeve 1, ensuring that the entire length of the metal pipe 2 is insulated and protected by the wooden sleeve 1, preventing localized high-temperature exposure.

[0020] Preferably, the wooden sleeve 1 is formed by connecting multiple continuous wooden sleeve 1 segments; an embedded metal sleeve joint 21 is provided at the connection between any two adjacent wooden sleeve 1 segments, or a continuous metal tube 2 is provided in the continuous wooden sleeve 1 segment.

[0021] The segmented, spliced ​​wooden sleeve structure is one of the core technological improvements of this invention. Existing wooden oxygen blowing pipes are limited by processing from a single piece of solid wood, making it difficult to source materials for long-length pipes and resulting in a low yield. This invention designs the wooden sleeve 1 as being composed of multiple spliced ​​wooden sleeve segments. The segments are combined and fixed together using methods such as tenon joints, mortise and tenon joints, and glued joints. The gaps between the segments are filled and sealed with fire-resistant sealant to ensure overall sealing and structural stability.

[0022] Regarding the arrangement of the metal tube 2 in the spliced ​​structure, this invention provides two specific implementation methods: Option 1: An embedded metal sleeve joint is installed at the connection point of any two adjacent wooden sleeve sections. In this case, the metal pipe 2 can be segmented, and each segment of the metal pipe is connected and ventilated through the metal sleeve joint at the connection point. The metal sleeve joint simultaneously serves the dual functions of structural connection and ventilation.

[0023] Form 2: A continuous metal pipe 2 is installed within a continuous wooden sleeve section. In this form, the metal pipe 2 is a single, continuous pipe that runs through the entire interior of the spliced ​​wooden sleeve, with each wooden sleeve section sequentially fitted onto the outside of the metal pipe 2. This form has a simpler structure, with the metal pipe 2 serving as the overall structural framework, and the spliced ​​wooden sleeve sections covering its exterior.

[0024] Both methods enable the segmented sourcing and processing of wooden sleeves, significantly reducing the production threshold and cost of long-length oxygen blowing pipes.

[0025] The high-temperature resistant wooden sleeve 1 is a wooden sleeve 1 with fire-resistant coatings on its inner and outer surfaces.

[0026] A refractory coating is applied to both the inner and outer surfaces of the wooden sleeve 1, forming a double-layer protection. The inner surface refractory coating isolates the metal pipe 2 from high-temperature radiation and the erosion caused by the high-temperature gas flow of oxygen; the outer surface refractory coating blocks the direct impact and ignition of high-temperature flames and molten slag inside the furnace. The synergistic effect of the inner and outer refractory coatings significantly improves the temperature resistance limit and erosion resistance of the wooden sleeve 1. The refractory coating is preferably an inorganic refractory slurry curing layer, with a single layer thickness of 0.5mm to 5mm, and can be silicate refractory slurry, aluminate refractory slurry, or silicon carbide-based refractory slurry, etc.

[0027] The high-temperature resistant wooden sleeve 1 is a wooden sleeve 1 that has been soaked in a high-temperature resistant impregnation solution and then dried and cured.

[0028] High-temperature impregnation treatment is another important means of improving the temperature resistance of the wooden sleeve in this invention. The wooden sleeve 1 is immersed in the high-temperature impregnation solution, allowing the impregnation solution to fully penetrate into the internal pores of the wood. After being removed, it is dried and cured, forming an inorganic protective film inside and on the surface of the wood, sealing the capillaries of the wood, and significantly improving the flame retardancy, high-temperature resistance and flame erosion resistance of the wood material.

[0029] The high-temperature resistant impregnation solution is any one of silicate solution, aluminate solution, or silica sol.

[0030] All of the above-mentioned inorganic high-temperature resistant systems are environmentally friendly, non-toxic, and have strong adhesion. Among them, silicate solutions (such as water glass) are inexpensive and have good permeability; aluminate solutions have excellent temperature resistance; and silica sol high-temperature resistant systems have good dispersibility and form dense films. Those skilled in the art can flexibly choose according to the target operating temperature and cost requirements.

[0031] The preferred soaking process parameters for the wooden sleeve 1 are: soaking at room temperature for 2 to 6 hours, and drying at 60 to 120°C until the moisture content is ≤3% to ensure that the impregnation agent is completely cured.

[0032] The wall thickness of the wooden sleeve is 3mm to 30mm; the wall thickness of the metal pipe is 2mm to 8mm.

[0033] The above thickness parameters were determined based on a comprehensive consideration of insulation performance, structural strength, cost control, and actual operating conditions. For wooden sleeves, a wall thickness of less than 3mm results in insufficient insulation and low structural strength; a thickness greater than 30mm increases material costs and makes the outer diameter of the fittings too large, hindering operation. For metal pipes, a wall thickness of less than 2mm results in insufficient strength and easy deformation; a thickness greater than 8mm leads to excessive cost and increases the overall weight of the fittings.

[0034] The refractory coating is an inorganic refractory slurry curing layer with a single layer thickness of 0.5mm to 5mm.

[0035] When the refractory coating thickness is less than 0.5 mm, the protective effect is insufficient; when it is greater than 5 mm, the coating is prone to cracking, increasing costs and affecting assembly accuracy. The above-mentioned thickness range can ensure the protective effect while taking into account the coating's adhesion and process economy.

[0036] The invention will be illustrated below with specific examples: I. Material Selection and Processing of Wooden Sleeve 1 The wooden sleeve 1 is made of hardwood, such as elm, oak, or birch, to ensure sufficient structural strength and erosion resistance. The wooden sleeve 1 can be manufactured as a single piece or in sections, depending on the required length. One-piece construction: Hollow pipes are made directly from a single piece of solid wood. They are suitable for shorter lengths (usually ≤2m) or when there is a sufficient supply of raw materials, and offer the best overall integrity.

[0037] Segmented splicing method: Multiple short wooden pipes are spliced ​​together to the required length. The pipe segments are fixed together using any of the following methods: tenon joint, mortise and tenon joint, or glue joint. After splicing, the gaps are sealed with fire-resistant sealant. This method is easy to obtain materials and has a high yield, making it particularly suitable for processing long oxygen blowing pipes (usually ≥3m).

[0038] The wall thickness of a single section of the wooden sleeve 1 is preferably 3mm to 30mm, and the inner diameter is determined according to the outer diameter of the matching metal tube 2. The two are preferably assembled with an interference fit to ensure a tight fit and good heat transfer.

[0039] II. High-Temperature Treatment of Wooden Sleeve 1 The high-temperature resistance treatment of the wooden sleeve 1 includes the following two methods, which can be used alone or in combination: Method 1: Impregnation treatment: Immerse the entire wooden sleeve 1 completely in a high-temperature resistant impregnation solution (silicate solution, aluminate solution or silica sol) at room temperature for 2 to 6 hours to ensure that the agent fully penetrates into the internal pores of the wood. After being removed, the tubes are placed in a drying device and dried at a constant temperature of 60–120°C until the moisture content of the wooden sleeve 1 is ≤3% and the impregnation agent is completely cured into a film.

[0040] Method 2: Coating treatment: Inorganic refractory slurry is applied to both the inner and outer surfaces of the wooden sleeve 1. After curing at room temperature, a refractory coating is formed, with the thickness of each layer controlled between 0.5 mm and 5 mm. The coating can be applied by brushing, spraying, or dipping to ensure a uniform coating without any missed areas.

[0041] III. Selection and Assembly of Metal Pipe 2 Metal pipe 2 can be any of steel pipe, aluminum pipe, or copper pipe, and can be flexibly selected according to the heat load, cost budget, weight requirements, etc. of the operating conditions. The wall thickness of the metal tube 2 is preferably 2mm to 8mm. During assembly, the metal tube 2 is inserted into the wooden sleeve 1, which has undergone high-temperature resistant treatment, and the two fit tightly together. For segmented splicing wooden sleeves, the segments can be fitted onto the outside of the metal tube 2 one by one during the splicing process, or metal sleeve joints can be set at the connection points of adjacent pipe segments to achieve the connection and conduction of each metal tube segment.

[0042] In use, the oxygen blowing pipe of this invention is connected at both ends to the oxygen supply pipeline and the oxygen blowing nozzle, respectively, with the metal pipe 2 serving as the oxygen flow channel. During oxygen blowing, the outer side of the wooden sleeve 1 directly faces the high-temperature environment inside the furnace, rapidly dissipating heat due to its low heat storage characteristics. Simultaneously, the inner and outer refractory coatings (if applicable) further prevent heat intrusion. The surface of the wooden sleeve 1 slowly carbonizes over long-term use; this carbonized layer provides some insulation. The carbonization products fall off in powder form or are blown out with the airflow, preventing the formation of hard lumps that fall into the melt.

[0043] When the carbonization of the wooden sleeve 1 reaches a certain level, only the wooden sleeve 1 can be replaced while the metal pipe 2 can be retained for continued use, thus reducing maintenance costs.

[0044] The following are specific examples of the present invention. Example 1 (Continuous integrated wooden sleeve + continuous steel pipe) A seamless steel pipe with a wall thickness of 3mm was selected as metal pipe 2, and its outer wall was derusted, degreased, and polished. Select a whole piece of hardwood with a wall thickness of 18mm to process a continuous wooden sleeve 1; The entire wooden sleeve 1 was immersed in a high-temperature resistant silica sol impregnation solution for 5 hours at room temperature. After removal, it was dried at 90°C until the moisture content was ≤3%. The inner wall of the wooden sleeve 1 is coated with silicate refractory slurry with a thickness of 1.5 mm and cured at room temperature; Insert the steel pipe into the wooden sleeve 1 and assemble them with an interference fit to obtain the finished product.

[0045] The product in this embodiment has a simple structure and good overall integrity, making it suitable for oxygen blowing applications with short lengths and high structural strength requirements. No hard blocks detach during use, and its service life is significantly extended compared to traditional sintered refractory oxygen blowing pipes.

[0046] Example 2 (segmented spliced ​​wooden sleeve + embedded metal sleeve connector) Hardwood with a wall thickness of 25mm was selected and processed into multiple hollow wooden sleeve sections; The assembled wooden sleeve is immersed in a high-temperature aluminate impregnation solution for 3 hours at room temperature, and then dried and cured at 100°C. Each wooden sleeve section is spliced ​​together using a tenon joint method, and the splice gaps are coated with fire-resistant sealant. An embedded aluminum tube is installed at the joint of each timber section as a metal sleeve joint (i.e., the metal tube is set in sections, and each section of metal tube is connected by a joint).

[0047] The wooden pipe sections in this embodiment are readily available and easy to process, making them particularly suitable for the production of long (≥4m) oxygen blowing pipes. The metal sleeve joint is embedded in the splice, simultaneously achieving structural connection and air passage function.

[0048] Example 3 (segmented spliced ​​wooden sleeve + continuous copper pipe) A copper tube with a wall thickness of 4mm was selected as the continuous metal tube 2; Select several short hard solid wood pipes with a wall thickness of 20mm, and fit each section onto the outside of the copper pipe in sequence. Use glue to splice them into an integral wooden sleeve 1, and apply fire-resistant sealant to the splice joints. The assembled wooden sleeve 1 (including the internal copper tube) was immersed in a silicate high-temperature resistant impregnation solution for 4 hours at room temperature. After removal, it was dried at 80°C until the moisture content was 2%. The outer surface of the wooden sleeve 1 is coated with silicon carbide-based refractory slurry with a thickness of 1 mm, and the finished product is obtained after curing.

[0049] In this embodiment, the copper pipe serves as a continuous, integral pipe fitting throughout each section of the wooden sleeve, resulting in high structural strength and excellent sealing. The copper pipe's superior thermal conductivity, combined with the low heat storage and dissipation characteristics of the wooden sleeve, leads to significant temperature control within the pipe body.

[0050] To address the above problems, this invention proposes a composite structure with a wooden sleeve as the main body and an internal metal tube. It combines the low heat storage and heat dissipation characteristics of wood with high-temperature resistant modification technology. At the same time, the segmented splicing wooden structure can reduce the difficulty of raw material sourcing and processing, and completely solve the problems of traditional products such as chipping, heat storage, easy melting and damage, short lifespan and limited material availability.

Claims

1. A low-heat-storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe, characterized in that, Includes a wooden sleeve (1), and a metal tube (2) is provided inside the wooden sleeve (1); The wooden sleeve (1) is a wooden sleeve (1) that has undergone high temperature resistance treatment; so that the wooden sleeve (1) mainly dissipates heat outward in a high temperature environment, and only produces powdery carbonized material after high temperature carbonization, without hard block falling off.

2. The low heat storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 1, characterized in that, The wooden sleeve (1) is a wooden tube that runs the length of the tube, and a metal tube (2) that runs the length of the tube is provided inside the wooden sleeve (1).

3. The low heat storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 1, characterized in that, The wooden sleeve (1) is formed by connecting multiple continuous wooden sleeve (1) segments; any two adjacent wooden sleeve (1) segments are provided with an embedded metal sleeve joint (21), or a continuous wooden sleeve (1) segment is provided with a metal pipe (2) that runs through the entire length.

4. The low heat storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 1, characterized in that, The high-temperature resistant wooden sleeve (1) is a wooden sleeve (1) with a fire-resistant coating (3) on its inner and outer surfaces.

5. A low-heat-storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 1, characterized in that, The high-temperature resistant wooden sleeve (1) is a wooden sleeve (1) that has been soaked in a high-temperature resistant impregnation solution and then dried and cured.

6. A low-heat-storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 5, characterized in that, The high-temperature resistant impregnation solution is any one of silicate solution, aluminate solution, or silica sol.

7. A low-heat-storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 1, characterized in that, The wall thickness of the wooden sleeve is 3mm to 30mm; the wall thickness of the metal base pipe is 2mm to 8mm.

8. A low-heat-storage, anti-falling, high-temperature resistant wooden oxygen blowing pipe according to claim 4, characterized in that, The refractory coating is an inorganic refractory slurry curing layer with a single layer thickness of 0.5mm to 5mm.

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