Definition Fly ash | Secondary combustion | Secondary Air | Hogged Fuel | Wind box
1. Fly ash –
Residue of fuel after the combustion which is carry with the flue gas towards stack & being collected in hoppers of Economizer/Air pre-heater/ESP (Electro-static precipitator).
2. Secondary combustion –
Combustion which occurs as a result of ignition at a point beyond the furnace.
3. Secondary Air–
Air which is supply to furnace to ensure complete combustion of fuel into the furnace to avoid any secondary combustion in the convection zone of boiler.
4. Hogged Fuel-
An unprocessed mix of coarse chips of bark and wood fiber. Pieces run between a coarse grade of less than 5″ to a fine grade of less than 2″.
5. Wind box –
A chamber below the grate or surrounding a burner, through which air under pressure is supplied for combustion of the fuel.