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Spray coating processing SPRAY PROCESSING
Supersonic Arc Spraying of Converter Smoke Hoods and Flues
Supersonic Arc Spraying for Converter Tundish and Flue Ducts After Spraying the Movable Tundish After Spraying the Lower Tundish Regarding Converter Tundishes and Flues: A converter tundish, also known as a converter waste heat recovery device, typically consists of a movable tundish, a furnace outlet flue, and a final-stage flue. During the blowing process, the movable tundish descends to prevent air from entering and mixing with the combustion gases, while simultaneously collecting the high-temperature flue gas. Both the movable tundish and the final-stage flue have large heat-transfer surfaces designed to reduce the temperature of the flue gas. Generally, these heat-transfer surfaces are made up of 20 layers of low-carbon steel tubes. The flue gas generated during steelmaking can reach temperatures as high as 1100–1400°C, with peaks up to 1600°C, and contains sulfur and its compounds, as well as substantial amounts of dust such as high-temperature slag and lime. As a result, the heat-transfer surfaces are subjected to erosion by solid particles, corrosion from acidic gases, and high-temperature oxidation. Splashed high-temperature slag easily adheres to the heat-transfer surfaces, causing severe high-temperature erosion and slag buildup. Over time, both the tundish and flue operate continuously under these harsh conditions, facing an extremely challenging working environment. In particular, their heat-transfer surfaces endure corrosive effects from sulfur-containing gases, high-temperature oxidation, and erosive wear, making them highly susceptible to developing numerous bamboo-like thermal fatigue cracks, pitting, and even perforations that lead to water leakage in the water-cooled tubes—conditions that significantly impact steelmaking production efficiency. The Role of Thermal Spraying in Tundish Protection: Although there are many thermal spraying techniques available, arc supersonic spraying—a method developed in recent years—has undoubtedly become the best approach for tundish protection. Its advantages include: 1) low cost and high efficiency; 2) superior bonding strength compared to other spraying methods; 3) the ability to add ceramic powders to the wire feed, thereby enhancing resistance to erosive wear. While thermal spray welding offers excellent protective performance, it is more difficult to implement, costly, and prone to deformation. Based on extensive domestic and international experience, we have developed a three-layer composite arc supersonic spray coating. Application tests on tundishes and power plant boilers have demonstrated that this coating can extend the service life of these components to over three years.
超音速电弧喷涂
活动烟罩喷涂
Product Description
Supersonic Arc Spraying of Converter Smoke Hoods and Flues
After spraying the activity hood After spraying the downflow hood
Regarding the converter hood and flue.
The converter hood, also known as the converter waste heat recovery device, typically consists of a movable hood, a furnace mouth flue, and a final-stage flue. It is used during the blowing process. During the process, the movable hood descends to prevent air from entering the mixing combustion chamber and to collect the high-temperature flue gases. Both components experience significant heating. The surface, used to reduce the flue gas temperature, typically consists of 20 sections of low-carbon steel tubes forming the heating surface.
The flue gas generated during steelmaking has a temperature ranging from 1,100 to 1,400°C, with peaks reaching up to 1,600°C, and contains sulfur and its... Compounds, high-temperature slag, lime, and large amounts of dust. As a result, the heated surfaces are subjected to erosion by solid materials and corrosion from acidic gases. Erosion and high-temperature oxidation can cause high-temperature slag splashing onto heated surfaces, leading to high-temperature erosion and slag buildup.
The fume hood and flue duct have been operating for a long time under the aforementioned conditions, in a harsh working environment—particularly, their heated surfaces are subjected to sulfur gas corrosion. Erosion, high-temperature oxidation, and erosive wear easily lead to the formation of numerous bamboo-joint-like thermal fatigue cracks, pitting, and perforations with leakage in water-cooled tubes. Water affects the production efficiency of steelmaking.
The Role of Thermal Spraying in Hood Protection
There are numerous thermal spraying techniques, but arc supersonic spraying—a technology that has developed in recent years—is undoubtedly the best process for protecting smoke hoods. Law, its advantages are:
1. Low cost, high efficiency;
2. The bonding strength is higher than that of other spray coatings;
3. Ceramic powder can be added to the filament to improve its resistance to erosion and wear.
Although thermal spray welding offers excellent protective performance, it is difficult to apply, costly, and prone to deformation.
Drawing on both domestic and international experience, we have developed a three-layer composite arc-supersonic thermal spray coating for use on flue gas ducts and power plant boilers.
Application evidence shows that the lifespan of both can be extended to over three years.
Online Quotation
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Spraying equipment SPRAY EQUIPMENT
Supersonic Arc Spraying of Converter Smoke Hoods and Flues
Supersonic Arc Spraying for Converter Tundish and Flue Ducts After Spraying the Movable Tundish After Spraying the Lower Tundish Regarding Converter Tundishes and Flues: A converter tundish, also known as a converter waste heat recovery device, typically consists of a movable tundish, a furnace outlet flue, and a final-stage flue. During the blowing process, the movable tundish descends to prevent air from entering and mixing with the combustion gases, while simultaneously collecting the high-temperature flue gas. Both the movable tundish and the final-stage flue have large heat-transfer surfaces designed to reduce the temperature of the flue gas. Generally, these heat-transfer surfaces are made up of 20 layers of low-carbon steel tubes. The flue gas generated during steelmaking can reach temperatures as high as 1100–1400°C, with peaks up to 1600°C, and contains sulfur and its compounds, as well as substantial amounts of dust such as high-temperature slag and lime. As a result, the heat-transfer surfaces are subjected to erosion by solid particles, corrosion from acidic gases, and high-temperature oxidation. Splashed high-temperature slag easily adheres to the heat-transfer surfaces, causing severe high-temperature erosion and slag buildup. Over time, both the tundish and flue operate continuously under these harsh conditions, facing an extremely challenging working environment. In particular, their heat-transfer surfaces endure corrosive effects from sulfur-containing gases, high-temperature oxidation, and erosive wear, making them highly susceptible to developing numerous bamboo-like thermal fatigue cracks, pitting, and even perforations that lead to water leakage in the water-cooled tubes—conditions that significantly impact steelmaking production efficiency. The Role of Thermal Spraying in Tundish Protection: Although there are many thermal spraying techniques available, arc supersonic spraying—a method developed in recent years—has undoubtedly become the best approach for tundish protection. Its advantages include: 1) low cost and high efficiency; 2) superior bonding strength compared to other spraying methods; 3) the ability to add ceramic powders to the wire feed, thereby enhancing resistance to erosive wear. While thermal spray welding offers excellent protective performance, it is more difficult to implement, costly, and prone to deformation. Based on extensive domestic and international experience, we have developed a three-layer composite arc supersonic spray coating. Application tests on tundishes and power plant boilers have demonstrated that this coating can extend the service life of these components to over three years.
超音速电弧喷涂
活动烟罩喷涂
Product Description
Supersonic Arc Spraying of Converter Smoke Hoods and Flues
After spraying the activity hood After spraying the downflow hood
Regarding the converter hood and flue.
The converter hood, also known as the converter waste heat recovery device, typically consists of a movable hood, a furnace mouth flue, and a final-stage flue. It is used during the blowing process. During the process, the movable hood descends to prevent air from entering the mixing combustion chamber and to collect the high-temperature flue gases. Both components experience significant heating. The surface, used to reduce the flue gas temperature, typically consists of 20 sections of low-carbon steel tubes forming the heating surface.
The flue gas generated during steelmaking has a temperature ranging from 1,100 to 1,400°C, with peaks reaching up to 1,600°C, and contains sulfur and its... Compounds, high-temperature slag, lime, and large amounts of dust. As a result, the heated surfaces are subjected to erosion by solid materials and corrosion from acidic gases. Erosion and high-temperature oxidation can cause high-temperature slag splashing onto heated surfaces, leading to high-temperature erosion and slag buildup.
The fume hood and flue duct have been operating for a long time under the aforementioned conditions, in a harsh working environment—particularly, their heated surfaces are subjected to sulfur gas corrosion. Erosion, high-temperature oxidation, and erosive wear easily lead to the formation of numerous bamboo-joint-like thermal fatigue cracks, pitting, and perforations with leakage in water-cooled tubes. Water affects the production efficiency of steelmaking.
The Role of Thermal Spraying in Hood Protection
There are numerous thermal spraying techniques, but arc supersonic spraying—a technology that has developed in recent years—is undoubtedly the best process for protecting smoke hoods. Law, its advantages are:
1. Low cost, high efficiency;
2. The bonding strength is higher than that of other spray coatings;
3. Ceramic powder can be added to the filament to improve its resistance to erosion and wear.
Although thermal spray welding offers excellent protective performance, it is difficult to apply, costly, and prone to deformation.
Drawing on both domestic and international experience, we have developed a three-layer composite arc-supersonic thermal spray coating for use on flue gas ducts and power plant boilers.
Application evidence shows that the lifespan of both can be extended to over three years.
Online Quotation
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