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The horizontal flue of a circulating fluidized bed boiler is usually lined with refractory castables to resist high temperatures, corrosion, and erosion by combustion products in the flue. Suitable castables can provide good fire resistance and stability. In the horizontal flue of circulating fluidized bed boilers, high-aluminum refractory castables are usually used. These castables have the characteristics of high-temperature resistance, corrosion resistance, and wear resistance, and are suitable for the flue lining of circulating fluidized bed boilers. The horizontal flue is the channel through which flue gas enters the cyclone separator from the furnace. The structure is generally made of high-temperature and wear-resistant bricks on the bottom and both sides of the wall, and high-temperature and wear-resistant castables on the top. For the water-cooled wall around the entrance of the horizontal flue, pins are welded to the fire surface and high-temperature-resistant and wear-resistant castables are laid. The high-speed flue gas carries unburned coal particles and fly ash that are more than ten times the amount of coal input, rotates 90 degrees into the horizontal flue, and impacts the water-cooled wall at the entrance. Therefore, the water-cooled wall at the entrance must be laid toward the fire surface. 400mm wide castable....
High-temperature resistant materials mainly refer to materials that can maintain stable performance and structural integrity in high-temperature environments. Many materials can work stably at high temperatures, some of which can withstand temperatures up to 1,600 degrees Celsius. Here are some common high-temperature materials: Alumina Ceramics: Aluminum oxide is a common high-temperature ceramic material that can withstand quite high temperatures. It is commonly used in ceramic insulation, refractory bricks, and other high-temperature applications. Silicon carbide ceramics: Silicon carbide ceramics have good high-temperature properties and can be used under high temperatures, high pressures, and corrosive atmospheres. It is often used in the manufacture of high-temperature stoves, refractory parts, etc. Silicon carbide fiber: This is a composite material composed of carbon fiber and carbon-based matrix. It has good high-temperature properties and can be used in aircraft, high-temperature stoves, and other fields. Zirconia: also a commonly used high-temperature material. Zirconia has excellent thermal and chemical stability, making it widely used in high-temperature environments. Zirconia has a melting point of approximately 2,700 degrees Celsius, allowing it to maintain structural integrity at very high temperatures. Zirconia has a relatively low thermal expansion coefficient, which makes it more thermally stable under high-temperature conditions. Magnesium oxide: a common...
Chrome corundum bricks are selected for hazardous waste (hazardous waste) disposal and incineration mainly because chromium corundum bricks have good fire resistance and corrosion resistance and can cope with high temperatures and harmful gas erosion during the incineration process. Here are some of the top reasons to choose chrome corundum bricks: High-temperature fire resistance: Chrome corundum bricks can withstand very high temperatures, as during the incineration of hazardous waste, temperatures can reach hundreds of degrees Celsius or even higher. The fire resistance of chrome corundum bricks makes them ideal for withstanding high temperatures, ensuring the reliable operation of equipment in harsh conditions. Corrosion resistance: Hazardous waste may contain harmful gases and chemicals that may cause corrosion to equipment surfaces. Chrome corundum bricks are made of chromium-containing aluminum oxide and have good corrosion resistance. They can resist the erosion of harmful gases and chemical substances and extend the life of equipment. Mechanical strength: Chrome corundum bricks have high mechanical strength, which helps maintain the structural stability of incineration equipment. Under high-temperature conditions, the structure of the equipment must be able to withstand mechanical stress, and the high strength of chrome corundum bricks helps to meet these challenges. Stability: The chemical stability...
To withstand molten iron at a temperature of 1,700 degrees, you need to choose a material with a higher temperature rating among refractory bricks. Common refractory bricks are mainly made of magnesia-chromium, magnesia-aluminum, and silicon carbide. Iron smelting usually uses an iron bath-type smelting reduction furnace, in which iron ore is converted into metallic iron through a reduction reaction. In this high temperature, reducing environment, choosing the right refractory bricks is very critical. The reduction furnace mainly uses alkaline refractory materials such as directly bonded magnesia chrome bricks, magnesite bricks carbon-containing refractory materials Al2O3-C bricks, MgO-C bricks, etc. Magnesia-alumina refractory bricks: This type of refractory brick is known for its stability at high temperatures and resistance to alkali. Due to the possible presence of a reducing atmosphere and alkaline substances in iron bath smelting reduction furnaces, magnesia-alumina refractory bricks generally provide better performance. Silicon carbide refractory bricks: Silicon carbide refractory bricks have good refractory resistance and good resistance to high-temperature environments. They provide superior resistance to erosion and thermal shock. Magnesia-Chrome Refractory Bricks: Magnesia-chromium refractory Bricks have high refractoriness and corrosion resistance and are suitable for high-temperature environments in reducing atmospheres. Chromium-aluminum refractory bricks: Chromium-aluminum refractory bricks combine the advantages...
The sulfur furnace is the equipment used for sulfur ore roasting or sulfide oxidation. It requires the use of a series of refractory materials to protect the furnace body from high temperature, corrosion, and chemical attack. The following are some of the refractory materials that may be used in sulfur furnaces: Refractory bricks: Refractory bricks are one of the common refractory materials used to build the inner walls of sulfur furnaces. These bricks can withstand high temperatures and chemical attacks. Corundum Brick: A high-temperature refractory material composed of alumina and corundum, the primary crystalline phase in alumina. Corundum (corundum) is a very hard ore usually formed from the high-temperature crystallization of aluminum oxide. Corundum bricks are widely used in various industrial applications due to their good high-temperature resistance, wear resistance, and chemical stability. Corundum-mullite brick: a high-temperature refractory material that combines the two crystal phases of corundum and mullite. This kind of brick usually contains alumina, corundum, and mullite in its composition. The combination of the two gives the brick some good properties. This kind of brick is widely used in high-temperature industrial fields, especially when it is required Taking into account high-temperature stability, wear resistance, and chemical stability. Refractory...
Boilers and kilns are both thermal devices used to heat objects, but they have some differences in design, purpose, and working principles. Design and Structure Boiler: A boiler is a device used to generate steam or hot water. It usually consists of a container, combustion equipment, and heat transfer surfaces (such as tubes or wall panels). Boilers produce heat by burning fuel and transferring it to a working fluid (usually water) to create steam or hot water. Kiln: A kiln is used to process raw materials, usually by heating them to high temperatures to change the properties of the substance. Its structure usually includes a furnace, heating source, and exhaust system. Kilns are commonly used to make ceramics, glass, plaster, etc., as well as other processes that require high-temperature processing. Use Boiler: Mainly used to produce steam for power generation or heating systems. Boilers in industry are also used in many processes such as chemical production, paper manufacturing, etc. Kiln: Mainly used to heat raw materials to achieve changes in chemical or physical properties. Kilns are widely used in the ceramic industry, metallurgical industry, building materials manufacturing, and other fields. Working Principle Boiler: Generates thermal energy by burning fuel and...
Ladles are containers used to receive molten steel in front of open-hearth furnaces, electric furnaces, or converters in steelmaking plants and foundries, and then transfer the molten steel for pouring operations. Generally, the quality of ladles affects the efficiency of smelting and transfer, which in turn affects the efficiency of ladles. The main factor of quality is the castables used in building ladles. The quality of ladle castables affects the quality of ladles and also affects the service life of ladles. Therefore, you must choose good ladle castables when choosing. Composition and characteristics of ladle castables Ladle castables generally use corundum, alumina-magnesia spinel, fused magnesia, and other raw materials as aggregates, plus some additives, and are made through micro-powder bonding technology. It has good slag resistance and peeling resistance. properties, thermal shock resistance, good strength, and volume stability, etc. It also has high refractory resistance, strong corrosion resistance, high adhesion rate, low resilience, easy spray repair, etc., and can resist the erosion of molten iron and slag. At the same time, it can be baked quickly without bursting, making it easy to repair and dismantle. Application of ladle castables Ladle castables are generally suitable for casting the walls of large...
The insulation layer of an alumina rotary kiln is to lay a layer of refractory fiber felt on the kiln shell, and then lay diatomaceous earth, floating bead bricks, or lightweight clay bricks. Some now use lightweight refractory castables. The working lining of the prezone is constructed with clay bricks, and the high-temperature calcined zone is constructed with high alumina bricks or phosphate-bonded unfired high alumina bricks. At present, unshaped refractory materials have been widely used in the aluminum industry, such as low-calcium aluminate refractory castables for the calcining zone, steel fiber-reinforced wear-resistant castables for the kiln mouth, kiln hood, kiln tail, and other parts. The flash furnace installs heat-resistant steel anchors or ceramic anchors on the furnace shell, then lays a layer of 20mm thick refractory fiber felt, and finally pours 200-300mm thick refractory castables. The working lining of the reverberatory furnace of the aluminum smelting furnace in contact with the aluminum liquid is generally built with high-aluminum bricks with an aluminum content of 80 to 85%. When smelting high-purity metallic aluminum, mullite bricks or corundum bricks are used. The combination of silicon nitride and silicon nitride bricks is used for the erosion and wear parts of the hearth...
Given the problems such as the short service life of forging heating furnace doors, high masonry repair costs, and heavy furnace doors, we can improve the use of furnace door castables by rationally selecting the raw materials of the castables, adjusting the component ratio, and adding additives performance. Causes of damage to heating furnace door The main function of the furnace door masonry refractory material is to protect the cast iron frame and block the flame in the furnace. To meet the requirements, refractory materials need appropriate fire resistance, mechanical strength, and related performance, but there are no special requirements for density. Therefore, we can reduce the density of the furnace door refractory material to reduce the weight of the furnace door. The problem of the short service life of the furnace door is mainly caused by the following reasons: poor thermal shock resistance of the refractory material of the furnace door, poor integrity of the refractory brick lining, and high temperature of the heating furnace. Due to the poor thermal shock resistance of refractory materials, serious brick breaking, and cracking will occur in the refractory brick lining under the working conditions of frequently opening the furnace door. In addition,...
Spheroidized ladle castable, also known as spheroidized ladle refractory castable, is a commonly used refractory material, mainly used for pouring molten iron in high-temperature environments. It is mixed with a variety of minerals and binders and has good fire resistance and fluidity. The working principle of spheroidizing castables During the smelting process of molten iron, slag, and impurities need to be separated from the molten iron to obtain pure molten iron. At this time, the spheroidizing bag castable plays an important role. The spheroidizing ladle castable is added to the pouring tank and then sprayed onto the conveyor belt via a nozzle. When the molten iron pours down from a height, the spheroidizing ladle castable will solidify quickly and form a strong protective layer to avoid contact between the molten iron and oxygen and prevent oxidation and combustion. In addition, the spheroidizing ladle castable can absorb impurities in the slag and improve the purity of the molten iron. It has excellent fire resistance and thermal stability and can withstand corrosion and erosion under high-temperature conditions. Advantages of spheroidizing castables Good fire resistance: The spheroidized ladle castable contains high-temperature stable minerals, which can resist corrosion and erosion in high-temperature environments. High...
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