Draw the draught distribution considering balanced draught system in a generator

Question

 In a steam power plant, the steam generator generates steam at the rate of 120 t/h at pressure of 100 bar and temperature of 500⁰C. The calorific value of fuel used by steam generator is 41 MJ/kg with an overall efficiency of 85%. In order to have efficient combustion, 17 kg of air per kg of fuel is used for which a draught of 25 mm of water gauge is required at the base of stack. The flue gases leave the steam generator at 240⁰C. The average temperature of gases in the stack may be taken as 200⁰C and the atmospheric temperature is 30⁰C. Work out the following:

1. The height of stack required
2. The diameter of stack at its base.
3. Draw the draught distribution considering balanced draught system in a generator and mention the advantages of balanced draught.

Take the following steam properties for solution:

h = 3375 kJ/kg, h_f = 632.2 kJ/kg.