Water · lb/hrmakeup + condensate → feedwater → steam + blowdown
condensate 6,316makeup 4,211FW 10,526steam 10,000blowdown 526
Energy · MMBtu/hfuel → steam · blowdown heat · stack + radiation
fuel 12.30 MMBtu/hto steam 9.94blowdown 0.15stack+rad 2.21boiler
WaterSize the makeup softener from this rate →
Blowdown526 lb/hr
Feedwater10,526 lb/hr
Makeup4,211 lb/hr · 8.4 gpm
Makeup, annual4.04 Mgal
Energy
Boiler duty10.09 MMBtu/h
Fuel input12.30 · 984,359 thm/yr
Fuel, annual$1,082,795/yr
Blowdown loss0.15 · 1.2% · $15,872/yr
Condensate credit0.76 MMBtu/h · $81,335/yr
Condensate chemistry
pH 4.70untreated condensate
Feedwater alkalinity48 ppm
Carbonate breakdown f(P)0.822
CO₂ in steam38.5 ppm · 9.2 lb/day
Amine demand, gross20.8 lb/day cyclohexylamine
Gross demand. With a DA, 50 to 100 percent of the amine in returned condensate recycles (Clayton, Table III). Real demand runs lower.
Oxygen scavenger
Feedwater O₂7 ppb
Demand (7.88:1 × 1.5)0.02 lb/day
Residual (30 ppm via BD)0.38 lb/day
Total sodium sulfite0.40 lb/day
At 7 ppb the residual dominates the demand, itself a teaching output.
Sources: ASME steam tables (saturation, interpolated on psig) · carbonate decomposition f(P) per Clayton, Volatile Amine Report Vol. 10.1, reproducing the Veolia/GE handbook 0.79/0.35 factors at f = 0.80 · sulfite ratios stoichiometric · the branded PDF that prints every assumption with its source tag arrives with accounts.