Egypt Engineering Consultant Mechanical

Practice session

An industrial water-tube steam boiler produces 10,000 kg/h of dry saturated steam at an absolute pressure of 10 bar (steam enthalpy h_steam = 2,778 kJ/kg). The incoming feedwater enters the economizer at 80°C (feedwater enthalpy h_feed = 335 kJ/kg). The boiler consumes 680 kg/h of natural gas having a Lower Heating Value (LHV) of 42,500 kJ/kg. Using the Direct Method (Input-Output Method), what is the thermal efficiency of the boiler?

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