How to Enhance the Strength of Circulating Fluidized Bed Boiler Lining?

The strength of the circulating fluidized bed boiler lining is very important. If the material is not properly selected or the quality control is not done well during the construction process, it is easy to cause large-scale collapse of the castable during operation and even serious wear of the heating surface pipes.

Enhance the Strength of Circulating Fluidized Bed Boiler Lining?

Selection of wear-resistant refractory manufacturers. Since there are many manufacturers of wear-resistant refractory materials on the market, and the quality is uneven, you must pay attention when selecting a manufacturer. It is best to contract the materials, construction and after-sales service to a reputable and qualified manufacturer. In this way, the circulating fluidized bed boiler lining can be guaranteed to the maximum extent. RS Refractory Manufacturer is a powerful refractory manufacturer with rich experience in the production and sales of refractory materials. RS manufacturer has completed many turnkey projects in the design, construction and material supply of circulating fluidized bed boiler refractory lining. If you choose RS manufacturer, RS manufacturer’s products and customer service will not disappoint you.

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Material selection. Start with the physical and chemical properties of the material (including wear resistance, heat resistance, corrosion resistance, thermal conductivity, stability, thermal expansion, shrinkage, compression and bending resistance and bulk density), while taking into account economy. Combine the characteristics of the lining part, the structure of the components that carry the lining, and the requirements of temperature resistance and wear resistance for comprehensive comparison. Be advanced in technology, reliable in structure and economically reasonable.

CFB lining materials have been developing continuously with the development of boilers towards high parameters, large capacity and new technologies, and many new varieties, new construction methods and technologies have been developed. This has promoted the innovation and improvement of lining structures, continuously improved wear resistance and heat resistance, and promoted the progress of fluidized bed combustion technology. RS manufacturers suggest that accurate design solutions, high-quality material selection, efficient construction quality and maintenance methods can greatly increase the strength of circulating fluidized bed boiler linings.

Why does the Circulating Fluidized Bed Boiler Lining need High-Strength Wear-Resistant Castables?

The main reasons why the circulating fluidized bed boiler lining needs to use high-strength wear-resistant castables are as follows. First of all, the circulating fluidized bed boiler is a high-efficiency, low-pollution boiler with good fuel adaptability, so its operating efficiency and application range have been widely used. However, during the operation of this boiler, due to incomplete combustion of fuel and uneven heat exchange, the temperature and material flow rate in the furnace will be unevenly distributed, causing serious wear and scouring of the boiler lining. Therefore, in order to protect the circulating fluidized bed boiler lining, high-strength wear-resistant castables are needed.

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Secondly, high-strength wear-resistant castables are a composite material composed of a variety of polymer materials and wear-resistant materials, with the advantages of high strength, high wear resistance, high temperature resistance, and corrosion resistance. This material can maintain its physical and chemical properties for a long time under a high-temperature environment, and effectively resist high temperature and chemical corrosion in the furnace. In addition, high-strength wear-resistant castables also have good impact resistance and wear resistance, which can effectively resist the high-speed impact and friction of materials and protect the lining from damage.

Finally, the construction of high-strength wear-resistant castables is simple and fast and can be customized according to the shape and size of the boiler, with strong adaptability. This material does not produce harmful gases during the pouring process, which can effectively protect the environment and workers’ health. In addition, the price of high-strength wear-resistant castables is also relatively reasonable, which can effectively reduce the maintenance cost of the boiler.

In summary, the lining of the circulating fluidized bed boiler needs to use high-strength wear-resistant castables to protect it from damage such as incomplete combustion of fuel, material impact and friction, extend its service life, and improve the operating efficiency and application range of the boiler.

Where is the Main Function of Wear-Resistant Castables?

As the name suggests, wear-resistant castables have extremely high wear resistance and can maintain the integrity of the cast body for a long time in harsh working environments. Its wear resistance is better than that of traditional high-aluminum refractory castables, and can extend its service life in key furnace linings. In metallurgy, power and other industries, wear-resistant castables are widely used in rotary kilns, boilers, dust collectors and wear-resistant layers of complex furnace linings, which can effectively resist the erosion of ores, metal materials, high temperatures and chemicals, and improve the operating efficiency of equipment.

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Wear-resistant castables have good corrosion resistance due to the addition of silicon carbide components, which play a skeleton support role and can resist the erosion of various acid and alkali chemicals. In the chemical, petrochemical and other industries, wear-resistant castables are suitable for anti-corrosion layers, which effectively prevent corrosive media from eroding the furnace lining and ensure the stability and safety of the production process.

Wear-resistant refractory castables have high compressive strength and can withstand greater pressure and impact. Moreover, it has good thermal shock resistance, which can reduce the wear and failure rate of the furnace lining, thereby reducing energy consumption and production costs. This helps to reduce the operating costs of enterprises and improve their competitiveness. At the same time, wear-resistant castables also have the characteristics of environmental protection and sustainable development. Their production and use processes meet environmental protection requirements and are conducive to reducing the generation of industrial waste.

In summary, wear-resistant castables play an important role in improving wear resistance, enhancing corrosion resistance, improving compressive strength and reducing energy consumption. It is one of the important refractory castables that are indispensable for industrial kiln linings.

Why can Mullite Bricks be Used as Thermal Insulation Materials?

Mullite brick is a refractory brick made mainly of mullite, a mineral compound composed of alumina (Al2O3) and silicon dioxide (SiO2). It is famous for its excellent thermal stability, high melting point and thermal shock resistance. Why can mullite brick be used as thermal insulation material? First of all, we need to understand the characteristics of mullite brick.

Features of RS Premium Mullite Bricks

RS premium mullite bricks have some of the following key features:

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1. High-temperature resistance: Mullite bricks can withstand high temperatures, typically ranging from 1600°C (2912°F) to 1800°C (3272°F). Even at high temperatures, it maintains strength and structural integrity, making it suitable for use in high-temperature conditions.
2. Low thermal conductivity: Mullite bricks have low thermal conductivity, which means it can provide good insulation and reduce heat loss in high-temperature environments. This feature makes it valuable for applications that require insulation or energy efficiency.
3. Excellent thermal shock resistance: Mullite bricks have excellent thermal shock resistance, which means it can withstand rapid temperature changes without cracking or flaking. This feature is critical for applications involving cyclic heating and cooling, such as furnaces, kilns, and reactors.
4. Chemical resistance: Mullite bricks have good resistance to chemical attack by acids, alkalis, and molten materials. This makes it suitable for chemical processing, metal refining and other industrial applications that may come into contact with corrosive substances.
5. Wide application: Mullite bricks are widely used in various industries such as ceramics, glass manufacturing, steel production, petrochemicals, and non-ferrous metals. It is often used in furnace linings, kiln furniture, hot gas pipes, regenerators and other demanding thermal environments.

RS factory mullite bricks are available in different shapes and sizes to meet specific installation requirements. For example, standard bricks, special shapes or custom designs. Contact Rongsheng for detailed information.

Why can Mullite Bricks be Used as Thermal Insulation Materials?

In general, mullite bricks have high-temperature resistance, thermal shock resistance, and chemical durability. This makes it a valuable refractory material in many industrial environments. In these industrial environments, reliable heat conduction and thermal stability are essential.

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Mullite polylight bricks are a kind of lightweight insulation bricks, also known as mullite insulation bricks. It has good thermal insulation effect, and its small body density and light weight are also one of its characteristics. At present, it is widely used in glass melting furnace upper structure material channel bricks, modification plates, and processing kiln upper structure. Insulation and heat insulation layer of firing kilns, smelting kilns, refining devices, heating devices, and other thermal equipment.

Because mullite polylight insulation bricks have a high porosity, they cannot bear excessive loads when using mullite insulation bricks, and must avoid contact with molten metal, slag and high-temperature furnace dust. When laying mullite insulation bricks, brick joints and expansion joints should be arranged correctly to avoid squeezing the masonry due to expansion. Mullite insulation bricks should not be subjected to strong mechanical vibration, impact and friction.

Layered structure: The molecular structure of mullite has a layered arrangement, which allows it to expand when heated to form an insulating air layer. This structure enables mullite bricks to effectively reduce the conduction of heat. Therefore, it exhibits good thermal insulation performance in high temperature environments.

Lightweight material: Mullite bricks are a lightweight material, so they do not add much weight when used in construction. This makes it suitable for various insulation applications, such as insulation boards, insulation materials, and furnace linings.

Refractory: Mullite bricks have high refractory properties and can withstand high temperatures without decomposing or melting. This makes it an ideal insulation material for high-temperature equipment such as furnaces, stoves, fireplaces, etc.

In general, the reason why mullite polylight bricks can be used as insulation materials is mainly because its density, chemical properties, layered structure, lightweight characteristics and refractory properties make it have good thermal insulation performance in high temperature environments. These characteristics make it one of the important materials in a variety of industrial and construction applications.

Are Lightweight Mullite Bricks Acid-Resistant?

Lightweight mullite bricks usually have a certain degree of acid resistance, but their specific corrosion resistance will be affected by many factors, including the composition of mullite bricks, preparation process, strength of acidic environment and special requirements.

Mullite brick is a refractory material with mullite as the main component. Mullite is a mixture of alumina (Al2O3) and aluminum silicate (Al2Si2O7), which has good high temperature resistance, thermal shock resistance and corrosion resistance. Mullite bricks contain a higher proportion of alumina, which makes it acid-resistant to a certain extent.

However, the strength and type of acidic environment also have an impact on the corrosion resistance of mullite bricks. Generally speaking, mullite bricks may show good corrosion resistance in mildly acidic environments, but corrosion may still occur in harsh strong acidic environments.

If mullite bricks need to be used in special acidic environments, it is recommended to understand their corrosion resistance in detail when selecting materials, and may take additional protective measures. For example, adding anti-corrosion coating or choosing other corrosion-resistant materials that are more suitable for specific acidic environments. It is recommended to conduct relevant experiments and tests before actual use to ensure that lightweight mullite bricks can meet the requirements in specific acidic environments.

8 Characteristics of Honeycomb Ceramic Catalyst Carrier

The main material of honeycomb ceramic carrier is cordierite. The honeycomb ceramic material used for automobile exhaust treatment is often porous cordierite, which mainly provides an inert physical structure for carrying the catalyst coating. The thermal expansion coefficient of cordierite is 2.9X10-6/℃. The melting point is about 1460℃, and it has good thermal stability. Cordierite has two homogeneous multiphase variants, namely low-temperature cordierite and high-temperature cordierite. High-temperature cordierite is also known as Indialite, which belongs to the hexagonal system; low-temperature cordierite is what people usually call cordierite, which belongs to the orthorhombic system. Rongsheng cordierite honeycomb ceramic manufacturer provides high-quality cordierite honeycomb ceramic products. Contact Rongsheng for detailed information.

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Honeycomb Ceramic Catalyst Carrier

In order to have a larger catalytic surface in a smaller volume, the surface of the catalyst carrier is made into a honeycomb shape. The biggest advantage is that it has a large specific surface, a low thermal expansion coefficient, excellent thermal shock resistance, strong acid and alkali resistance and corrosion resistance, and has high mechanical strength.

As a carrier, honeycomb ceramic is a key component of the three-way catalytic converter. One of its important materials is cordierite, which is resistant to high temperatures, has a high continuous operating temperature of up to 1200°C, high strength and low linear expansion coefficient. The carrier adopts an effective surface and a suitable pore structure. The ceramic carrier has an opening rate of 400-600 mesh/inch2 and a minimum wall thickness of about 0.16mm. It can enhance the mechanical strength of the catalyst, and also improve its resistance to wear, impact, gravity, pressure, high temperature and phase change. Improve the conductivity of the catalyst and reduce the content of active components. Especially when using precious metal catalysts such as platinum, palladium and rhodium, the active components can be highly dispersed and the dosage can be reduced.

In short, the quality of the carrier is extremely important for the catalyst. The mesh number of the honeycomb ceramic carrier can be 200 mesh, 300 mesh, 400 mesh or 600 mesh. The cross-sectional shapes include circular, racetrack, elliptical and some special shapes according to customer requirements, in order to meet the needs of different application conditions.

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Characteristics of Honeycomb Ceramic Catalyst Carrier

Honeycomb ceramic catalyst carrier has eight significant advantages, as follows:

1. Thin pore wall, large specific surface area, low resistance, low bulk density, high compressive strength.
2. Small thermal expansion coefficient.
3. Good thermal shock resistance and thermal shock resistance.
4. Good matching with various catalyst active components.
5. Good cold start performance, low ignition temperature, fast heating, small gas resistance, high conversion efficiency.
6. Spiral, double S and three-core core structures can be produced according to user requirements.
7. It can be designed into cylindrical, runway and other special-shaped structures according to the requirements of different motor vehicles.
8. The product meets the manufacturing and supporting requirements of various scales and models of motor vehicles and meets Euro III and more stringent emission standards.

Application of Cordierite Ceramics

1. Square mirrors for photolithography

As one of the core units of a photolithography machine, the motion accuracy of the ultra-precision worktable directly affects the resolution of the photolithography machine. As the core component of the worktable, the square mirror guarantees the accuracy of the worktable and the efficiency of photolithography. The thermal load on the square mirror during operation will change continuously due to the influence of the heat flow in the working space, requiring its deformation to change as little as possible with temperature. At the same time, it is also necessary to deal with the distortion correction caused by its operation at higher acceleration and speed. Therefore, in order to meet the requirements of photolithography accuracy, the thermal expansion coefficient of the square mirror material must achieve near-zero expansion at the working temperature, and it must also have good mechanical properties. Cordierite ceramics are ideal materials for square mirrors for photolithography machines due to their low thermal expansion coefficient, excellent mechanical properties and low density. ASML has achieved mature application and promotion of cordierite ceramics in the mobile platform components of photolithography machines.

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2. Optical mirrors for optical communication

Cordierite has the characteristics of low thermal expansion, high mechanical strength and high rigidity, long-term dimensional stability, and radiation resistance, and can be used in space optical communication. Sony CSL has adopted Kyocera cordierite ceramic mirrors for small near-Earth orbit security laser communication terminals.

3. Refractory materials

Cordierite ceramics are often used as ceramic packaging materials and kiln tools during the use of kilns due to their low thermal expansion coefficient. At the same time, cordierite ceramics have the characteristics of low density, low thermal conductivity and good high-temperature stability, and can also be used in heat exchange devices with fast temperature changes, such as heat-resistant pots. There are a large number of gaps between the six-membered rings of cordierite crystals and between the upper and lower adjacent six-membered rings. This loose crystal structure gives it an extremely low thermal expansion coefficient, and can be used as a lost foam refractory coating during the casting process, improving the precision of the casting.

4. Catalyst carrier

Cordierite has a loose crystal structure and a low thermal expansion coefficient, so it can be made into a porous cordierite catalyst carrier. The service environment of the catalyst carrier material is complex and has high requirements for material performance. In particular, the monolithic catalyst used for automobile exhaust treatment, during the operation of the engine, due to the effect of thermal shock, the temperature of the exhaust gas rises to about 700°C in a few seconds. When the engine stops, the temperature drops rapidly to the ambient temperature. A good automobile exhaust monolithic catalyst needs to repeat this process thousands of times, and the carrier needs to support the catalyst and ensure mechanical strength. Cordierite ceramics also have good thermal shock resistance, thermal shock resistance, chemical stability and certain mechanical strength, and are also widely used in water pollution treatment.

5. Microwave communication dielectric materials

Cordierite ceramics have a low dielectric constant and a near-zero frequency temperature coefficient. It is an ideal low-dielectric high-frequency microwave dielectric ceramic, which is used in the preparation of electronic packaging dielectric resonant antennas, microwave device substrates, high-end microwave components and other devices.