Specific parameters of Boiler Bricks for high pressure boiler

High-pressure boiler bricks, also known as refractory bricks, play a crucial role in the construction of boilers designed to operate at elevated pressures and temperatures. These bricks must withstand harsh conditions, including high temperatures, thermal cycling, and exposure to corrosive substances. Here's a detailed description of the specifications for high-pressure boiler bricks:

1. Material Composition: • Refractory Material: High-pressure boiler bricks are typically made from refractory materials that can withstand extreme temperatures. Common materials include fireclay, high alumina, silica, and magnesia. 2. Alumina Content: • High Alumina Bricks: Alumina content is a critical factor for high-pressure boiler bricks. Higher alumina content provides better resistance to temperature and abrasion. Bricks with alumina content ranging from 40% to 90% are used, depending on the specific application. 3. Chemical Composition: • Low Impurities: The bricks must have low impurity levels to ensure chemical stability and resistance to corrosion. Impurities like iron oxide and alkalis can compromise the performance of the bricks. 4. Thermal Conductivity: • Low Thermal Conductivity: High-pressure boiler bricks should have low thermal conductivity to minimize heat loss and ensure efficient insulation. This property helps in maintaining high temperatures within the boiler. 5. Compressive Strength: • High Compressive Strength: These bricks must have high compressive strength to withstand the pressure generated within the boiler. Compressive strength is crucial for maintaining structural integrity under the high loads experienced in a high-pressure environment. 6. Abrasion Resistance: • Abrasion-Resistant: The bricks should resist abrasion caused by the movement of fuel, ash, and other particles within the boiler. This ensures a longer service life for the refractory lining.

7. Resistance to Thermal Shock: • High Thermal Shock Resistance: The bricks must resist thermal shock caused by rapid temperature changes during start-up, shutdown, or other operational variations. Thermal shock resistance prevents cracking and spalling. 8. Density: • Optimal Density: The density of high-pressure boiler bricks is an important factor for their performance. It affects both mechanical strength and thermal properties. The bricks are usually dense and well-fired to achieve the desired properties. 9. Porosity: • Low Porosity: Low porosity is essential to prevent the absorption of water or other liquids, which could lead to spalling during heating cycles. 10. Shape and Size: • Precision in Shape and Size: Bricks are manufactured in various shapes and sizes to fit specific areas within the boiler structure. Precision in manufacturing ensures a tight fit and proper alignment during installation. 11. Installation Method: • Proper Installation Techniques: The installation of high-pressure boiler bricks requires skilled personnel to ensure that they are laid with precision, creating a solid and durable refractory lining. Chemical composition of boiler bricks Parameters Requirement Alumina content (Al2O3) 40.0 % Ferric oxide (Fe2O3 ) Max 3.0 % PCF Value Orton cone 31 -32 Refractories under load Ta 1400 c Refractories under load Te 1600 0 c PLC at 1400 0 c for three hours NMT +1 % Apparent Porosity 23 -25 % C.C.S 300 -350 Kg/cm3 Bulk Density 2.1 gm/cc Size tolerance 1.0 mm Understanding and adhering to these specifications is crucial for the proper functioning and longevity of high-pressure boilers. Additionally, regular inspection and maintenance are essential to address wear and tear over time.