Question

The reheat cycle from the previous problem will be augmented by three stages of feed preheating as shown in the figure. The boiler operates at a pressure of 900 psia, and the maximum allowable temperature is $860^\circ F$. Steam for the preheaters is available at pressures of 300, 90, and 30 psia, and the liquids leaving the preheaters are saturated liquid at the preheater pressure. The condenser will operate as a total condenser, discharging saturated liquid at a temperature of $150^\circ F$. Compare the thermal efficiency of this cycle with and without regenerative feed preheating. You can assume that the pumps and turbines are adiabatic and reversible. Locate the most relevant points on the Mollier (H-S) diagram. P=900 (14) Boiler-Superheater H=? ① wwwwwwwwwwwww P=300 T=417.3 H=393.9 v=0.0189 P-4 (13) P=900 T=860 H=1429 $1,610 Preheater 3 H-3 Reheater 2 P=300 (12) $1,610 P=300 T=570 H=1296 T-1 3 High- pressure turbine P-3 P=90 T=320 H=290.6 v=0.0177 P=90 T=320 $1,610 H=1185 Preheater 2 H-2 P=90 (10) P=90 T=830 H=1443 $1,868 P-2 P=30 T=250 H=218.8 v=0.017 Preheater 1 H-1 P-1 8 v=0.0162 T=150 P=30 P=3.7 H=117.9 Condenser 5 P=30 $1,868 T=540 H=1303 T-2 6 P=3.7 S=1.868 H=1125 T=150 Low- pressure turbine Units of P [=] psia T [=] $^\circ F$ H [=] Btu/lb S [=] Btu/lb $^\circ R$

Name: the reheat cycle from the previous problem will be augmented by three stages of feed preheating as shown in the figure the boiler operates at a pressure of 900 psia and the maximum allowable 24247
Uploaded: 2025-05-14T20:45:04-08:00
Duration: 9 min 27 s
Channel: Mark Scythian
Description: the reheat cycle from the previous problem will be augmented by three stages of feed preheating as shown in the figure the boiler operates at a pressure of 900 psia and the maximum allowable 24247

          The reheat cycle from the previous problem will be augmented by three stages of feed preheating as
shown in the figure. The boiler operates at a pressure of 900 psia, and the maximum allowable temperature is
$860^\circ F$. Steam for the preheaters is available at pressures of 300, 90, and 30 psia, and the liquids leaving the
preheaters are saturated liquid at the preheater pressure. The condenser will operate as a total condenser,
discharging saturated liquid at a temperature of $150^\circ F$. Compare the thermal efficiency of this cycle with and without
regenerative feed preheating. You can assume that the pumps and turbines are adiabatic and reversible. Locate
the most relevant points on the Mollier (H-S) diagram.
P=900 (14) Boiler-Superheater
H=?
①
wwwwwwwwwwwww
P=300
T=417.3
H=393.9
v=0.0189
P-4
(13)
P=900
T=860
H=1429
$1,610
Preheater 3
H-3
Reheater
2
P=300 (12)
$1,610
P=300
T=570
H=1296
T-1
3
High-
pressure
turbine
P-3
P=90
T=320
H=290.6
v=0.0177
P=90
T=320
$1,610
H=1185
Preheater 2
H-2
P=90
(10)
P=90
T=830
H=1443
$1,868
P-2
P=30
T=250
H=218.8
v=0.017
Preheater 1
H-1
P-1
8
v=0.0162
T=150
P=30
P=3.7
H=117.9 Condenser
5 P=30 $1,868
T=540 H=1303
T-2
6
P=3.7
S=1.868
H=1125
T=150
Low-
pressure
turbine
Units of P [=] psia
T [=] $^\circ F$
H [=] Btu/lb
S [=] Btu/lb $^\circ R$

the reheat cycle from the previous problem will be augmented by three stages of feed preheating as shown in the figure the boiler operates at a pressure of 900 psia and the maximum allowable 24247

Added by Alfonso W.

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