Liquid acetylene, C₂H₂, is stored in a high pressure storage tank at ambient temperature, 25◦C. The liquid is fed to an insulated combustor/steam boiler at a steady rate of 1 kg/s, along with 140% theoretical oxygen, O2, which enters at 500 K, as shown in Fig. P13.162. The combustion products exit the unit at 500 kPa, 350 K.

Liquid water enters the boiler at 10◦C, at the rate of 15 kg/s, and superheated steam exits at 200 kPa.

a. Calculate the absolute entropy, per kmol, of liquid acetylene at the storage tank state.

b. Determine the phase(s) of the combustion products exiting the combustor boiler unit and the amount of each if more than one.

c. Determine the temperature of the steam at the boiler exit.

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CH 2 0 FIGURE P13.162 5 Steam Liquid HO Products 3