page_title: Grate firing
section_title: Types
hierarchical_section_title: Grate firing / Types
caption_attribution_description: English: travelling grate of a 25 bar coal fired steam boiler in a sugarfactory Deutsch: Wanderrost eines stillgelegten kohelgefeurten Dampfkessels in einer Zuckerfabrik
context_page_description: 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 and secondary air
context_section_description: 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.
caption: travelling grate in an old steam boiler
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