Application of refractory materials in circulating fluidized bed boilers

As energy demand continues to grow, circulating fluidized bed boilers (CFB boilers) have become one of the important equipment in the industrial and power industries due to their high efficiency and low pollution. In the operation of CFB boilers, the selection and application of refractory materials are crucial to the performance and life of the boiler. This article will discuss in detail the application of refractory materials in circulating fluidized bed boilers, including their types, performance characteristics, installation and maintenance points, and demonstrate through practical cases that high-quality refractory materials can extend the service life of the boiler, improve combustion efficiency and reduce maintenance costs. significant advantages in other aspects.

Types and performance characteristics of refractory materials

Refractory materials play a role in protecting the inner wall of the boiler and withstanding high temperatures and chemical corrosion during the operation of CFB boilers. When selecting refractory materials, its properties such as high temperature resistance, corrosion resistance, thermal stability and mechanical strength need to be considered. Commonly used refractory materials mainly include:

• High alumina bricks: have higher fire resistance and better corrosion resistance, and are suitable for parts with higher temperatures.
• Refractory castable: easy to install, small thermal expansion, suitable for refractory treatment of complex-shaped parts.
• Silica material: has good thermal shock stability and strong corrosion resistance. It is mostly used in furnaces and furnace walls.
• Silicon carbide brick: good thermal conductivity, especially in wear-resistant parts.

Installation and maintenance points

The installation and maintenance of refractory materials directly affects its service life and the overall operating performance of the boiler. Here are some key takeaways:

1. Construction preparation: Before installing refractory materials, the installation site needs to be cleaned to ensure that the surface is clean, flat and free of oil and rust.
2. Construction technology: Choose a reasonable construction technology according to the characteristics of different refractory materials. For example, the castables should be mixed evenly in proportion to avoid bubbles and voids.
3. Drying and heating: After installation, drying and heating are required to relieve the stress in the material and improve its stability. Operation should be carried out strictly in accordance with the heating curve.
4. Regular inspection and maintenance: During operation, the wear, cracking and erosion of refractory materials should be checked regularly and repaired and replaced in a timely manner to ensure that they remain in optimal condition.

Actual case analysis

A power plant uses CFB boilers to generate electricity. It originally used ordinary refractory materials. Due to poor high temperature resistance and corrosion resistance, the boiler was frequently shut down for maintenance, which affected production efficiency. After market research and technical evaluation, the power plant was replaced with a solution combining high alumina bricks and refractory castables. After one year of operation analysis, the solution significantly extended the service life of the boiler, reduced the number of shutdowns, reduced fuel consumption by 5%, and reduced maintenance costs by 30%.

in conclusion

The application of refractory materials in CFB boilers not only affects the performance and life of the boiler, but is also related to the optimization of production efficiency and maintenance costs. Through the scientific selection and rational application of refractory materials, the operating effect of the boiler can be significantly improved, bringing long-term economic benefits and competitive advantages to the enterprise. Therefore, engineers, technicians and decision-makers should pay attention to the selection and management of refractory materials to ensure efficient and stable operation of boilers.

If you need further information on specific cases or technical details, please contact a professional refractory material supplier or technical support team.