Grate firing is a type of industrial combustion system used for solid fuels. It now is used mainly for burning waste and biomass, but also for smaller coal furnaces.

• Capacities 0.3 to 175 MWth in industry and CHP
• Fuel fired per grate area 1-2 MW/m², maximum grate area 100 m²
• Grates are typical only suitable for coarse particles, for fine particles a spreader is required, increases max. capacity
• Primary air through the grate (also used for cooling) and secondary air

You can help expand this article with text translated from the corresponding article in German. (August 2010) Click [show] for important translation instructions. View a machine-translated version of the German article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 9,118 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at [[:de:rostfeuerung]]; see its history for attribution. You may also add the template {{Translated|de|rostfeuerung}} to the talk page. For more guidance, see Wikipedia:Translation.

Travelling grate

A moving grate which is covered with a fuel layer, 10-30 cm. Power control by means of varying the grate velocity

Reciprocating grate

For ash-rich, low calorific fuels like municipal waste, arrangement of stationary and moving grates -> conveying and mixing (forward-moving type or reverse-action grate)

Vibrating grate

Water cooled membrane wall, with holes for air. For burning coal or wood.

The grate area is the area of the grate (length x width). The larger the grate area, the more fuel can be burned per hour. The amount of fuel burned also depends on the fuel or bed movement velocity.

• Fluidised bed firing
• Pulverized fuel firing