I. Basic Properties and Technical Parameters of Basic Refractory Bricks
Basic refractory bricks are refractory materials mainly composed of magnesium oxide, calcium oxide or a mixture of the two, and they possess the following remarkable properties:
High-temperature performance:
Refractoriness under load: Ordinary products range from 1550 to 1600 °C, while high-grade products such as magnesia-dolomite bricks and magnesia-spinel bricks can reach above 1700 °C; semi-rebonded and rebonded magnesia-chrome bricks can hit 1750–1800 °C.
Thermal expansion rate: At 1600 °C, magnesia bricks have the maximum linear expansion rate (approximately 2.0%), and premium magnesia-chrome bricks have the minimum value (approximately 1.6%).
Thermal conductivity: At 800 °C, magnesia bricks (MgO 90–98%) show a thermal conductivity of 5.0–5.5 W/(m·K), and magnesia-chrome bricks range from 3.5 to 4.5 W/(m·K).
Corrosion Resistance:
It boasts excellent corrosion resistance against metallurgical slag, cement clinker, glass furnace raw batches and ash.
In the burning zone of cement kilns, the order of resistance to cement clinker corrosion is: magnesia-dolomite brick > magnesia-chrome brick > magnesia-spinel brick.
Other Properties:
Its specific heat capacity is higher than that of silica bricks and fireclay bricks.
The thermal shock resistance decreases in the following order: magnesia-spinel brick > magnesia-chrome brick > magnesia-dolomite brick > magnesia brick.
Poor hydration resistance, especially magnesia-calcium bricks which have a strong tendency to hydrate.
II. Demand Characteristics of Refractory Materials in the New Energy Sector
The new energy industry puts forward special requirements for refractory materials:
Performance Requirements:
It needs to withstand higher temperatures and more complex thermal stress environments.
Superior corrosion resistance is required, particularly resistance to erosion caused by new fuels and media.
Longer service life and higher reliability are required.
Market Trends:
The global refractory market size is projected to reach 37 billion US dollars by 2027, with an annual compound growth rate of approximately 5%.
Demand for green and high-performance refractory materials continues to rise.
The Asia-Pacific market accounts for 78%, and China is the world's largest producer and consumer.
Technology Development Trends:
R&D of long-service-life and high-performance refractory materials
Development of eco-friendly materials
Application of intelligent production processes
III. Specific Applications of Basic Refractory Bricks in the New Energy Sector
1,Solar Energy Sector
Solar thermal power generation: Used as supporting materials for solar concentrators and reflectors, they endure high-temperature heat flux and efficiently focus thermal energy onto heat collection tubes.
Heat storage system: Assembled as heat-absorbing bricks inside insulated containers to store heat generated by solar energy for later use.
2,Wind Energy Sector
Wind Turbines: Applied in combustion chambers to withstand high-temperature gas and ensure safe turbine operation; also adopted in high-temperature components such as heat exchangers and exhaust pipelines.
Thermal Energy Storage: Similar to solar energy storage, it can store heat generated by wind power, enabling factories to operate on renewable energy even during windless periods.
3,Hydrogen Energy Industry
Used in high-temperature reactors and electrolyzers for hydrogen production, featuring high temperature resistance and corrosion resistance against hydrogen and water vapor.
Excellent thermal conductivity ensures uniform temperature distribution and improves reaction rate and efficiency.
4,Other New Energy Fields
Biomass Energy: Applied to the furnaces of biomass-fired boilers and the internal structures of biomass gasification equipment.
Geothermal Power Generation: Expected to serve as an important construction material for geothermal well walls
Nuclear Energy Equipment: It is applied in nuclear energy equipment, with limited publicly available specific details.
IV. Development Trends of Basic Refractory Bricks in the New Energy Sector
Growing Market Demand:
The global emphasis on renewable energy has fueled the rapid development of solar thermal power generation, wind power, hydrogen energy industry and other sectors.
The innovation and popularization of new energy technologies will drive the rapid growth of the basic refractory brick industry.
Technology Development Orientation:
Improve key performance indicators such as refractoriness, compressive strength and service life
Develop new conductive refractory bricks. For instance, the "conductive refractory bricks" developed by an MIT spin-off company support decarbonization in heavy industries.
Optimize manufacturing processes, such as the application of 3D printing technology.
Environmental Protection and Sustainable Development:
Adopt eco-friendly production processes and materials to reduce emissions
Promote the recycling and reutilization of refractory bricks
Chromium-free trend, developing alternative products such as periclase-spinel materials
International Competition:
Strengthen exchanges and cooperation with international counterparts
Enhance the international competitiveness of products and expand overseas markets
V. Summary and Outlook
Basic refractory bricks play a vital role in the new energy sector thanks to their excellent high-temperature performance and corrosion resistance. As the global energy structure shifts toward renewable energy, the application scope of basic refractory bricks will be further expanded. Future development trends will focus on three dimensions: performance improvement, eco-friendly manufacturing and international market expansion. Technological innovations, such as the development of new conductive refractory bricks, will deliver more efficient and sustainable solutions for the new energy industry.