Condenser Duty
Product
+Water
I
II
Envelope I:Envelope II:Heat In
Reflux + Product Vapor
Steam
Heat Out
Reflux Liquid
Product Liquid
Water
Condenser Duty
Heat In
Internal Reflux X Vapor
Product Vapor
Steam
Heat Out
Internal Reflux X Liquid
Product Liqued
Water
Condenser Duty.
Reflux
R + P + S
X + P X
Fig. 22 Tower overhead heat balance diagram
Table 9 Tower overall heat balance
Stream
V/L
API
Wat. K
F
lb/h
Btu/lb
MMBtu/h
In
Crude
V + L
–
11.7
720
379,575
175.939
Steam
V
37,381
1,290
48.221
Total in
416,956
224.160
Out
Residue
L
13
11.5
704
197,085
378
74.498
HGO
L
30
11.5
615
26,754
336
8.989
LGO
L
36.3
11.5
488
44,226
255
11.278
Kero
L
45.5
12
359
34,860
184
6.414
Naphtha
L
70.0
12
100
37,381
100
3.738
Refluxes
115.717
Total out
416,956
224.160
174
D.S.J. Jones