A regenerative steam cycle uses two closed-feed heaters. Determine the amount of steam bled at each stage. It is known that:
pB=10 bar, hB=3033 kJ/kg, pC=1.0 bar, hC=2590 kJ/kg, pG=40 bar, hG=112 kJ/kg. Boiler supplies 10 kg/s steam to the turbine.
| Inputs |
Units |
|
|
Spec. enthalpy at B |
3033,00 |
kJ/kg |
|
Spec. enthalpy at C |
2590,00 |
kJ/kg |
|
Spec. enthalpy at G |
112,00 |
kJ/kg |
|
Pressure at B |
10,00 |
bar |
|
Pressure at C |
1,00 |
bar |
|
Pressure at G |
40,00 |
bar |
|
Mass flow through the system |
10,00 |
kg/s |
|
Outputs |
||
|
For the throttling process, I-J |
. |
. |
|
hE = hI = hJ |
762,61 |
kJ/kg |
|
For the throttling process, K-L |
. |
. |
|
hF = hK = hL |
417,51 |
kJ/kg |
|
Energy balance on FH1 gives, mB |
1,52 |
kg/s |
|
Energy balance on FH2 gives, mC |
1,16 |
kg/s |