Evaporative capacity of a boiler can be expressed in terms of : * kg of steam per hour * kg of steam per hour per square meter of heating surface (kg/h/m2) * kg of steam per kg of fuel fired Generally the output or Evaporative capacity of the boil
DetailsActual evaporation = (boiler capacity x 540) / (hg - Tf) F&A rating:-The boiler is rated to work at a certain pressure and at that pressure it can generate a defined quantity of steam. This can also be written as the F & A rating of the boiler.
DetailsFig. 1: Evaporation Process in Steam Boiler Surface water wall tubes get heat transfer by radiation, and then heat is transferred in entire of surface water wall tubes of steam boiler by conduction. When water in the water wall tubes is heated, reduction of density occurs, …
DetailsThe ratio of the equivalent evaporation of the boiler to the actual steam flow rate is called the: Select one: A. Heat rate B. Factor of evaporation C. Equivalent evaporation D. Boiler efficiency E. Boiler evaporation ratio
DetailsThe actual radiation and convection losses are difficult to assess because of particular emissivity of various surfaces and shape of boiler, air flow pattern etc. In generally it can be assumed between 1% to 2% for smaller boilers and 0.2% to 1 % for higher size boilers of about 500MW.
DetailsThe purpose of the performance test is to determine actual performance and efficiency of boiler. It is an indicator of operational conditions of boiler and basis for improvement of performance. These are two parameters such as: (1) Efficiency of boiler. (2) Evaporation ratio. Thermal Efficiency of Boiler:
DetailsA boiler generates 8 kg of dry saturated steam per kg of fuel oil burned. Fuel oil heating value is 33 000 kJ/kg. Feedwater is supplied at 70°C, and the boiler pressure is 1400 kPa. Actual evaporation divided by the factor of evaporation Factor of evaporation times the …
DetailsThe boiler pressure is 100 psi and the boiler water temperature is 338°F. The latent heat is 881 Btu. What is the factor of evaporation? FE = SH + LH / 970.3 FE = SH + LH / 970.3 FE = ((338 - 225) + 881) / 970.3 FE = 1.02 Where, FE factor of evaporation SH sensible heat LH latent heat 970.3 latent heat of evaporation of water at 212°F.
DetailsBoiler Horsepower What is the boiler horsepower of a boiler generating 21,500 lbs of steam per hour at 155 psi? The factor of evaporation is 1.08. BHP = (LB/HR*fe)/34.5 BHP Boiler Horsepower BHP = (LB/HR*fe)/34.5 Lb/Hr Pounds per Hour BHP = 21500 * 1.08 / 34.5 Fe Factor of Evaporation …
DetailsThe actual evaporation corrected for moisture in the steam is 152,775 and the equivalent evaporation from and at 212 degrees is, therefore, 165,516 pounds. The total dry fuel will be 17,500 × .97 = 16,975, and the evaporation per pound of dry fuel from and at 212 degrees will …
DetailsThis tutorial explains the three most commonly used boiler ratings: The 'From and at' rating for evaporation, the kW rating for heat output, and boiler horsepower. 'From and at' rating The ‘from and at’ rating is widely used as a datum by shell boiler manufacturers to give a boiler a rating which shows the amount of steam in kg/h which the
Details