The Use of Mullite PolyLight Bricks and the Use Temperature of Different Grades

Mullite polylight bricks are generally marked with JM, where J is the first letter of the pinyin of polylight and M is the first letter of the pinyin of mullite. They are mainly used for heat preservation in the linings of various high-temperature furnaces to improve the heat preservation effect of high-temperature furnaces and reduce energy consumption. Mullite polylight bricks are also used in the heat preservation of equipment in thermal power plants, nuclear power plants, etc.

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The Use Temperature of Different Grades of Mullite Polylight Bricks

However, different grades of mullite polylight bricks are used at different temperatures. Insulation mullite bricks are generally divided into different grades of JM-23, JM-26, JM-28, JM-30, and JM-32 according to national standards. JM-32 is not used much. The use ratio of JM-23, 26, and 28 is more.

• JM-23 mullite polylight bricks, Al2O3 is 48%, and the use temperature is 1300℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1300℃×24h is ±1.
• JM26 mullite polylight bricks, Al2O3≥55%, and the use temperature is 1400℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1400℃×24h to 0.7-0.8.
• JM28 mullite poly light brick, Al2O3 at 65%, use temperature at 1500℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1500℃×24h to 0.7.
• JM30 Al2O3 at 72%, use temperature at 1600℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1600℃×24h to 0.6.
• JM32 is not often used, and is generally customized according to the special requirements of users.

Different grades of mullite poly light bricks can be used at different use temperatures. Different grades of mullite bricks are selected according to the temperature and use conditions of the user’s kiln and different furnace types. Rongsheng Refractory Factory can also customize and produce polylight mullite bricks according to customer’s specifications.

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High Temperature Furnace Mullite Insulation Refractory Brick Factory

Mullite insulation brick physical and chemical indicators. Mullite insulation brick, as a material commonly used in building insulation, has excellent insulation performance and mechanical strength. Rongsheng Refractory Factory will elaborate on the physical and chemical indicators of mullite insulation bricks, covering thermal conductivity, compressive strength, water absorption and other aspects.

1. Heat conductivity is an indicator to measure the thermal conductivity of materials, usually expressed as λ, with the unit of W/(m・K). The thermal conductivity of mullite insulation bricks is mainly affected by factors such as the density, porosity and composition of the material. Generally speaking, the lower the density and the higher the porosity of mullite insulation bricks, the lower its thermal conductivity. According to national standards, the thermal conductivity of mullite insulation bricks should be less than 0.065W/(m・K) to ensure its excellent insulation performance. To achieve this requirement, manufacturers usually take measures such as controlling the raw material ratio and optimizing the process to reduce the thermal conductivity of the brick body.
2. Compressive strength is an indicator used to measure the compressive performance of materials, usually expressed in MPa. The compressive strength of mullite insulation bricks is directly related to their service life and safety performance in building structures. Generally speaking, the higher the compressive strength of mullite insulation bricks, the more they can withstand external loads. According to national standards, the compressive strength of mullite insulation bricks should be greater than 1.5MPa. In order to improve the compressive strength of mullite insulation bricks, manufacturers usually use methods such as adding reinforcing materials and adjusting the firing process to improve them.
3. Thermal conductivity is an indicator that describes the thermal conductivity of a material, usually expressed in K, with a unit of W/(m・K). The thermal conductivity of mullite insulation bricks is the ratio of thermal conductivity to material thickness, which is used to calculate heat transfer per unit area. According to national standards, the thermal conductivity of mullite insulation bricks should be less than 0.065W/(m・K). By controlling the thermal conductivity and thickness of the brick body, the thermal conductivity of mullite insulation bricks can be effectively reduced and its insulation performance can be improved.
4. Density is an indicator that measures the relationship between material mass and volume, usually expressed as ρ, with the unit of kg/m³. The density of mullite insulation brick directly affects its thermal conductivity and compressive strength. Generally speaking, the lower the density of mullite insulation brick, the lower its thermal conductivity, but the compressive strength will also be reduced accordingly. Therefore, when designing, it is necessary to weigh the requirements of thermal insulation performance and structural strength and select an appropriate density.

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Rongsheng Mullite Insulation Brick

The physical and chemical indicators of mullite insulation bricks are an important basis for evaluating their insulation performance and performance. By controlling the thermal conductivity, compressive strength, water absorption and other indicators of the brick body, the insulation effect and service life of mullite insulation bricks can be improved.

In actual use, it is necessary to select suitable mullite insulation bricks based on the specific requirements and environmental conditions of the building. At the same time, manufacturers also need to continuously improve the process and material formula to improve the performance and quality of mullite insulation bricks to meet market demand.

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.