Stoke (fire)
As fomenting the agitation / circulation is of the solid fuel in a grate furnace called. The fire is fanned by stoking. It burns stronger and more evenly.
Mode of action
The effect is based on the fact that the ash that has formed when the fuel burns is shaken off the fuel and falls down. As the ash falls off, the air supply to the reactive fuel surface is increased, so that the combustion rate increases. Often the fuel, smoldered and crumbly by the action of the fire , disintegrates into smaller pieces during stoking , which also increases the reactive surface and thus the reaction speed.
Furthermore, the effect is based on the fact that when the fuel is circulated, it does not burn off on one side on the upper side, but evenly from all sides. As the hot combustion gases rise and the flames rise, the fire receives its ignition energy, which keeps the fire burning, reinforced by convection and thermal radiation from above. If the fuel is stoked and re-layered, burning / glowing pieces - and with them the ignition energy - are transported downwards and surfaces that have not yet been burned are directed upwards, where they receive increased ignition energy.
A special use of stoking is the re-igniting of a fire that has almost been extinguished by exposing embers in the ashes in connection with the laying on of fresh fuel. Trapped in the ashes (thermal insulator and oxygen barrier), fuel residues glow for a very long time; if they are stoked, the energy is often sufficient to rekindle the fire without fire means or ignition aid. Stirring is therefore often used synonymously with ignition .
Technical implementation
Manually stoked small firings
In the case of firings in the home ( wood stove , fireplace , grill , ...) the stoking is mostly done by hand by poking, stirring and scratching with a poker or a similar stick or stick.
The same applies to historical furnaces on steam locomotives or steam ships , where a stoker is responsible for the stoking. An experienced and skilful stoker can control the air supply in the furnace very precisely through the correct stoking and layering of the fuel and thus set the burn rate and the temperature as desired.
In forging the proper lacing is the Esse of particular importance; because the temperature and the oxygen supply in the forge influence the properties of the forging.
Automatically fueled industrial furnaces
In industrial grate furnaces, stoking takes place automatically through a mechanism that moves the grate support. The movement simultaneously transports the fuel and the ash forward. In this way, very inhomogeneous and lumpy fuels such as household waste or scrap wood can also be burned on step gratings (sliding grates) or roller grates.
Web links
Individual evidence
- ↑ Guide to solid fuel fireplaces at http://www.schornsteinfeger-innung.de
- ↑ The fiery fire on www.schmiedetechniken.de ( memento of the original from January 24, 2010 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
