Grate (definition)

Grate — is a component of solid fuel boilers that serves to support and maintain combustion of the fuel. It is a grate or mesh placed at the bottom of the boiler's combustion chamber, through which air enters for the combustion process, and through which ash residues are removed. In modern use, the component performs several key functions:

Grate: main functions and features

1. Fuel support:
   • Ensures uniform distribution of fuel in the combustion chamber and maintains it above the ash level, which promotes efficient combustion.
2. Air supply:
   • Equipped with holes or grates through which air is supplied, which is necessary for the combustion process. In modern systems, especially in automated boilers, the air supply can be regulated and directed under the grate to improve combustion and increase the efficiency of the boiler.
3. Ash removal:
   • Allows ash and other combustion residues to fall down and out of the firebox. This prevents ash from building up, which can block air flow and reduce combustion efficiency.
4. Modern technologies:
   • Modern solid fuel boilers can be equipped with various technologies to improve the combustion process. For example, grate bars with active air supply system, where fans or compressors supply air under the structure, which helps create optimal conditions for fuel combustion and prevents the formation of large amounts of ash.
   • May also be used grate bars with automatic cleaning system, which allows periodic removal of ash without the need for manual intervention, maintaining high operating efficiency boiler.
5. Materials and construction:
   • They are made of durable materials that can withstand high temperatures and aggressive effects of combustion products. These can be heat-resistant steels, cast iron or special alloys.
   • Designs can range from simple grilles to more complex systems with adjustable sections and additional elements to improve efficiency.

Selecting a grate design for a boiler

The grate structure is a critical element solid fuel boilers, ensuring efficient combustion of fuel and maintaining optimal conditions for boiler operation. Modern versions use technologies to improve air supply, combustion control and ash removal, which contributes to higher efficiency and reliability of heating systems.