Fuel flow to a boiler is calculated as,
Fuel flow = (Heat duty x 1000 x 3.6) / (4.2 x GCV x Efficiency /100)
Wednesday, December 3, 2008
Thursday, September 4, 2008
Dulongs formula for GCV calculation
If we know the ultimate analysis of fuel, we can easily calculate its GCV.
The basic principle is that there are only 3 components in a fuel which generate heat. These are:
Carbon, Hydrogen and Sulphur.
According to Dulong's formula gross calorific value of a fuel is;
GCV = ((35.5 x C + 114.8 x H + 9.5 x S – 14.5 x O) x 1000) / (100 x 4.1868)
Each multiple of carbon, hydrogen and sulphur represents heat generated by its one mole.
The formula gives GCV in kcal/kg. Simple isnt it !
The basic principle is that there are only 3 components in a fuel which generate heat. These are:
Carbon, Hydrogen and Sulphur.
According to Dulong's formula gross calorific value of a fuel is;
GCV = ((35.5 x C + 114.8 x H + 9.5 x S – 14.5 x O) x 1000) / (100 x 4.1868)
Each multiple of carbon, hydrogen and sulphur represents heat generated by its one mole.
The formula gives GCV in kcal/kg. Simple isnt it !
Boiler Heat Duty
Boiler heat duty = Tonnes per hour of steam generated x (Enthalpy of main steam - Enthalpy of feed water)
Various systems of a coal fired power plant
•Coal Handling System: Consisting of crushers, conveyors, belts etc.
•Water treatment plant: Consisting of RO system, cation and anion exchangers, DM system, mixed bed system.
•Boiler package: PF, AFBC, CFBC etc.
•Turbine package: Consisting of turbine, generator, condensor (Air cooled or water cooled)
•Condensate system: With water cooled or air cooled condensor.
•Plant air system: Consisting of compressors, receivers
•Ash handling system: Slurry system or dense phase pneumatic ash handling system
•Electrical system including generation and distribution: Consisting of busbars, transformers, circuit brakers, MCC etc.
•Control and instrumentation along with DCS.: Consisting of transmitters, guages, PLC, DCS with the associated communication cables.
•Civil: With or without piling
•BOP package ( Air conditioning, ventilation, fire fighting, Public address system, plant illumination)
•Water treatment plant: Consisting of RO system, cation and anion exchangers, DM system, mixed bed system.
•Boiler package: PF, AFBC, CFBC etc.
•Turbine package: Consisting of turbine, generator, condensor (Air cooled or water cooled)
•Condensate system: With water cooled or air cooled condensor.
•Plant air system: Consisting of compressors, receivers
•Ash handling system: Slurry system or dense phase pneumatic ash handling system
•Electrical system including generation and distribution: Consisting of busbars, transformers, circuit brakers, MCC etc.
•Control and instrumentation along with DCS.: Consisting of transmitters, guages, PLC, DCS with the associated communication cables.
•Civil: With or without piling
•BOP package ( Air conditioning, ventilation, fire fighting, Public address system, plant illumination)
Steam Generator Basics
Steam Generator is based on Rankine cycle•Definition: Equipment which produces steam from water with heat from fuel. Steam generator is also conventionally known as boiler.
•Fuel analysis:
•a) Proximate analysis: Includes Fixed carbon, Volatile matter, Moisture and Ash %ages by mass.
•B) Ultimate analysis: Gives respective C, H, O, N, S, M, Ash %ages by mass.
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