Kiln inlet chamber

Refractory Castable for Kiln Hood: A Solution to Protect and Enhance Kiln Efficiency

1. Introduction to Kiln Hood and Refractory Requirements

The Kiln Hood is a crucial component of rotary kilns in cement plants, located at the clinker outlet. This area endures high temperatures, mechanical impacts from hot gas streams and clinker dust, as well as thermal expansion stresses. Therefore, refractory materials used in the Kiln Hood must exhibit excellent heat resistance, thermal shock resistance, and high abrasion resistance.

2. Refractory Castable – An Optimal Solution for Kiln Hood

Refractory castable is an unshaped refractory material widely used to line Kiln Hoods due to its outstanding advantages:

• High heat resistance: Can withstand temperatures up to 1,400 – 1,800°C depending on the material type.
• Thermal shock resistance: Reduces cracking risk due to sudden temperature changes.
• Good mechanical strength: Abrasion resistant and capable of bearing loads.
• Flexible installation: Easily shaped and repaired on-site.

3. Types of Refractory Castables for Kiln Hood

Based on composition and characteristics, refractory castables for Kiln Hood are classified as follows:

• High Alumina Castable: High Al₂O₃ content, excellent heat resistance, and durable in harsh environments.
• Low Cement Castable (LCC): Enhanced mechanical strength and thermal shock resistance.
• Ultra Low Cement Castable (ULCC): Chemical corrosion resistance and lower porosity.
• No Cement Castable (NCC): Improved thermal strength and flexibility.