DULONG (1820) = (80.8 x C) + (344.6 x H) – (43.1 x O) + (25 x S)		BOIE (1953) = (84 x C) + (277.7 x H) – (26.5 x O) + (15.0 x N) + (25 x S)
SEYLER (1938) = (123.9 x C) + (388.1 x H) + (25 x O2) - 4269		NEAVEL (1986) = (81.05 x C) + (316.4 x H) – (29.9 x O) + (23.9 x S) - (3.5x Ash)
MOTT & SPOONER (1940) OXYGEN < 15% = (80.3 x C) + (339 x H) - (34.7 x O) + (22.5 x S)		GIVEN (1986) = (78.3 x C) + (339.1 x H) – (33.0 x O) + (22.1 x S) + 152
MOTT & SPOONER (1940) OXYGEN > 15% = (80.3 x C) + (339 x H) - (36.6 x O) + (0.17 x O2) + 22.5 x S NOTE: these formulas are not valid for coal blends.  Design   Efficiency sizing calculation  for CFB BOILER                                                                                                                                                     FIRST STEP  :::COMPOSITION OF FUEL TO BE USED IS VERY MUCH ESSENTIAL TO KNOW BEFORE GOING FOR SIZING CALCULATION OF BOILER AND BOILER COMPONENTS EXAMPLE Let the composition of Coal   Ash: 45%  Carbon: C= 25.90%  Hydrogen  H2 = 3.80% Oxygen O2= 8.50% Nitrogen N2= 1.80% Sulphur S=00.00% Moisture = 15% HHV=(ARB) 14233.556 KJ/KG               ARB  =AS RECEIVED BASIS Amount of air required per kg of fuel Theoretical dry air required MDA=[ [ 11.53 *C+34.34 *(H-O/8)+ 4.34 *S +A*S]  ]  PUTTING THE ABOVE VALUES FROM THE ABOVE MENTIONED ULTIMATE ANALYSIS  CONSIDERING  A= 2.38 FOR S CAPTURE A=0 FOR NO SULPHUR FUEL . MDA=  3.926  KG/KG of FUEL