Anticipating the coming of the “hydrogen economy,” an enthusiastic mechanical engineer invents a steam generator. Pure hydrogen, H₂, enters the wellinsulated combustion chamber at 298 K with a flow rate of 0.3 kg/s. The oxidizer is pure oxygen, O₂, and enters in stoichiometric proportions (i.e., Φ = 1). A steam generator coil is located in a well-insulated tailpipe of the apparatus. Saturated liquid water enters the steam-generator coil at 10MPa. Steam (saturated vapor at 10 MPa) exits the coil. The products of combustion (H₂O) exit the tailpipe at 2000 K. Neglect any dissociation in either the combustion chamber or the tailpipe. Determine the following (including units):

A. The mass flow rate of the O₂

B. The maximum temperature in the combustion chamber assuming all the H₂ and O₂ react to form H₂O at constant pressure

C. The heat removed from the product stream in the tailpipe section

D. The mass flow rate of the steam through the steam-generator coil

Transcribed Image Text:

0₂ T= ? H₂ Combustion chamber Tail pipe 000 Sat. vap. H₂O @ 10 MPa T = 2000 K Sat. liq. H₂O @ 10 MPa H₂O