Keterangan
what is Refractory balls？
Refractory balls are a type of refractory material widely used in high-temperature industrial equipment. They are usually made of high-quality refractory raw materials such as high-aluminum, corundum or silicon carbide. They have excellent high-temperature strength, thermal shock stability and corrosion resistance, and are often used as heat storage bodies in industrial kilns, hot air furnaces and heat storage chambers.
Refractory balls achieve efficient heat storage and exchange and improve energy utilization through their high specific surface area and porosity. Selain itu, their wear resistance and thermal shock resistance enable them to maintain long-term stability in high-temperature environments, making them an indispensable key material in the industrial high-temperature field.
Refractory Balls for Industrial Furnaces
Physical properties of refractory balls
| Performance Indicators | unit | Typical range |
|---|---|---|
| Body density | g/cm³ | 2.2 ~ 3.5 |
| Apparent porosity | % | 15 ~ 35 |
| Kekuatan tekan | MPa | 20 ~ 100 |
| Coefficient of thermal expansion | ×10⁻⁶/°C | 4 ~ 8 |
| Konduktivitas termal | W/(m·K) | 1.5 ~ 3.5 |
| Ketahanan terhadap guncangan termal | Second-rate | >20（1100°C water cooling） |
| Maximum operating temperature | °C | 1400 ~ 1800 |
| Komposisi kimia | – | Al₂O₃, SiO₂, SiC |
Features and advantages of refractory balls
- Excellent high temperature performance: It can remain stable at high temperatures of **1400°C~1800°C**, has good high temperature strength and softening resistance, and is suitable for high temperature equipment such as industrial kilns and hot blast furnaces.
- Efficient heat exchange capacity: With high specific surface area and appropriate porosity (**15%~35%**), it can effectively store and transfer heat, improve thermal efficiency, and reduce energy consumption.
- Excellent thermal shock stability: It exhibits excellent thermal shock resistance during rapid temperature rise and fall, and can withstand frequent thermal cycles without cracking or damage.
- High compressive strength and wear resistance: Its compressive strength is usually **20~100 MPa**, and it has wear resistance and can be used for a long time under high temperature and high mechanical load.
- Ketahanan korosi kimia: It has strong corrosion resistance to acidic or alkaline gases and slag, and can maintain stable performance in harsh environments.
- Energy saving and environmental protection: Through efficient heat storage and heat exchange, refractory balls help reduce energy waste and carbon emissions, meeting the green environmental protection requirements of modern industry.
- Long service life: Due to its excellent high temperature performance and thermal shock resistance, the refractory balls have a long service life, reducing the maintenance and replacement frequency and saving costs.
Ceramic Refractory Balls for Thermal Insulation
Refractory ball production process
- Select high-purity refractory raw materials, seperti bauksit alumina tinggi, corundum, silikon karbida, dll..
- Ratio the raw materials according to a specific formula to ensure the performance indicators of the refractory ball.
- Grind the raw materials to a certain fineness, usually micron-sized particles.
- Add binders (such as clay, silica sol, dll.) and water and mix them thoroughly.
- Use processes such as **isostatic pressing**, **roller ball forming** or **extrusion molding** to press the mixture into a spherical embryo.
- Control the molding pressure and time to ensure the consistency of the embryo density and shape.
- Dry the formed embryo, usually at **100°C~150°C**, to remove moisture and improve the embryo strength.
- Put the dried embryo into a kiln and sinter it at a high temperature of **1400°C~1800°C**.
- Control the sintering temperature curve to ensure that the material is fully sintered and obtain excellent physical and chemical properties.
- Physical properties of fired refractory balls are tested, such as bulk density, apparent porosity, compressive strength, thermal shock stability, dll..
- Ensure that the products meet technical requirements and standards.
- Refractory balls are graded according to the test results.
- Moisture-proof and shock-proof packaging is used to ensure integrity during transportation and storage.
Three major applications of refractory balls
1. Industrial furnace heat storage
- Application scenario: used in heat storage chambers of high-temperature industrial furnaces (such as steel, keramik, kaca dan industri lainnya).
- Fungsi: Through the high specific surface area and porosity of refractory balls, heat can be efficiently stored and exchanged, thermal efficiency can be improved, and energy consumption can be reduced.
- Advantages: ketahanan suhu tinggi, thermal shock resistance, and high heat exchange efficiency.
2. Hot air furnace heat carrier
- Application scenario: used in hot blast furnaces supporting iron-making blast furnaces.
- Fungsi: As a heat carrier, refractory balls absorb and release heat in hot blast furnaces to provide high-temperature hot air for blast furnaces.
- Advantages: Good high-temperature stability, long service life, and help improve production efficiency.
3. Chemical Industry Reactor Packing
- Application scenarios: used as fillers in chemical reactors, cracking furnaces and other equipment.
- Fungsi: Provide a stable high-temperature environment to promote chemical reactions and improve heat transfer efficiency.
- Advantages: Ketahanan korosi, ketahanan suhu tinggi, and good chemical stability.
Ulasan
Belum ada ulasan.