A boiler plant incorporates and economizer and air preheater and generates steam at 40 bar and 300oC with fuel heating value of 33000 kg/hr. The temperature of feedwater is raised from 40oC to 125oC in the economizer and the flue gases are cooled at the same time from 395oC to 225oC. The flue gas then enters the air preheater at a pressure of 1.2 bar and 16oC with a pressure rise across the fan of 18 mm of water. The power input to the fan is 5 kW and it has mechanical efficiency of 78%. Neglecting heat losses and assuming the flue gases as ideal gas with constant specific heat of Cp = 1.01 kJ/kg-K, calculate: (a) the mass flow rate of the air, (b) the temperature of flue gases leaving the plant, (c) the mass flow rate of the steam, and (d) the efficienc
A boiler plant incorporates and economizer and air preheater and generates steam at 40 bar and 300oC with fuel heating value of 33000 kg/hr. The temperature of feedwater is raised from 40oC to 125oC in the economizer and the flue gases are cooled at the same time from 395oC to 225oC. The flue gas then enters the air preheater at a pressure of 1.2 bar and 16oC with a pressure rise across the fan of 18 mm of water. The power input to the fan is 5 kW and it has
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