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a stationary or moving grate. The burning is accomplished in three stages in a single chamber: (1) moisture evaporation; (2) distillation and burning of volatile matter; and (3) burning of fixed carbon. This type of boiler has a fast response to load changes, has improved combustion control, and can be operated with multiple fuels. Natural gas, oil, and/or coal, are often fired in spreader stoker boilers as auxiliary fuels.
Marine boilers usually burn residual low-grade fuels. This fuel isstored in double-bottom tanks from which it is drawn by a transferpump up to settling tanks. Here any water in the fuel maysettle out and be drained away. The high-pressure fuel is supplied to a burner which it leaves as anatomised spray.
For users of industrial boilers, utilizing low sulfur fuels is the most cost effective method of SOx reduction. Because SOx emissions primarily depend on the sulfur content of the fuel, burning fuels containing a minimal amount of sulfur (distillate oil) can achieve SOx reductions, without the need to install and maintain expensive equipment.
Fuel reburning involves diverting 10–20% of a boiler's fuel input to create a secondary combustion zone downstream of the primary zone. In the secondary or reburn zone, NOx from the primary zone is reduced to elemental N 2. Additional air is added higher up in the furnace to complete the combustion.
BOILERS AND BURNING FUELS Boilers and other fuel combustion units have a range of environmental regulations that affect their operations. This section provides information on …
Various Design Burners for Marine Boiler
#4 fuel oil (bunker oil) is used in large stationary engines, power plants, and very large commercial boilers. No. 4 oil when burned as heating fuel may contain several contaminants including nickel and sulphur. No. 4 fuel oil is typically produced by blending distillate along with residual fuel oils such as No. 2 …