From a flow diagram of steam production and usage. Condensate return CR(O) Process Evaporation EO) Make-up Boiler feed Boiler @ 7 bar Mix) F (S) Blowdown B (c) Based on the following information. - at 7 bar, h--721.32 kJ/kg, h, = 2.768.37 kJ/kg Average calorific value of coal - 32,000 kJ/kg Boiler efficiency 85% . Cost of coal - S50 /ton Density of coal - 830 kg'm Operating condition: 24 working hours day, 300 days year Make-up water cost = 10 baht/m la) Derive blowdown rate in terms of CR/E, X, and c 1b) Based on the diagram above, a 5,000-kg/hr boiler has make-up water which contains 600 ppm dissolved solids (TDS) and the steam system operates with 50% condensate return. If allowable TDS in the blowdown is 5,000 ppm, calculate the blowdown rate. le) Mr. A. proposes an idea to save the cost by increasing the allowable TDS concentration in the drum to 5,500 ppm and 60% of condensate return. Calculate a new value of blowdown rate? How much money can you save per year? (include all possible savings from the changing of parameters.) Id) Mr. B. proposes an idea to save the cost by increasing a rate of condensate return 60% CR and improve a quality of make-up water to 500 ppm. Calculate a new value of blowdown rate? How much money can you save per year? (include all possible savings from the changing of parameters.) le) Whose idea do you prefer? Why? Give you rationale in terms of economy and technical feasibility If) Propose other options to save operation cost and energy of the system