Solid fuel combustion involves the chemical reaction of solid materials, such as coal, wood, biomass, or waste, with oxygen to produce heat, light, and various combustion products. This process typically occurs in furnaces, boilers, stoves, or other combustion systems designed to efficiently burn solid fuels for heating, power generation, or industrial processes.
2. Solidfuel
combustion
Solid fuel combustion involves the burning of solid
materials (e.g., coal, biomass, wood) to generate heat
and energy.
3. Fixedbed
combustion
Fixed bed combustion is a widely used method for burning
solid fuels like coal, biomass, and wood pellets.
Solid fuel rests on a grate within a combustion chamber.
Air is supplied from below the grate to support
combustion.
Ash, the incombustible residue, falls through the grate
and is collected.
4. Advantages
Simple design and operation
Easy maintenance and fuel loading
Ability to burn a variety of solid fuels
Suitable for small- to medium-scale applications
5. Gratefurnaces
Specific type of fixed bed combustion system with a
moving grate.
Grate moves the fuel progressively from the fuel feed to
the ash discharge end.
Components of Grate Furnaces
Fuel Bed: Layer of solid fuel resting on the grate.
Grate: Moving mechanism that transports fuel through
the furnace.
Primary Air: Air supplied from below the grate to
support combustion.
Secondary Air: Additional air supplied above the fuel
bed for complete combustion.
6.
7. Underfeed
stokers
Underfeed stokers provide a continuous feeding
mechanism for solid fuels.
Solid fuel is fed from a hopper into a ram box located
beneath the grate.
A ram mechanism pushes the fuel continuously onto the
grate from below.
Airflow for combustion occurs from below the grate,
similar to fixed bed systems.
Operation of Underfeed Stoker Feeders
Fuel Feeding: Solid fuel is fed into the combustion
chamber from beneath the fuel bed.
Combustion Zone: Heat from burning fuel initiates
combustion.
Ash Removal: Ash is continuously removed from the
combustion zone.
10. Challengesand
Considerations
Proper fuel sizing and preparation are essential for
efficient combustion.
Air distribution must be optimized to ensure complete
combustion.
Ash handling and disposal require attention to
maintain system performance.