ENTRAINMENT RATIO =
1.0
0
TEMPERATURE ENTRAINMENT RATIO R
ti & R
ts
100 200 300 400 500 600 700 800 900 1000
.9
.8
.7
.6
WT of Air or Steam at Act. Temp,
WT of Air or Steam at 70° F
A I R O R E Q U I V A L E N T A I R
A I R O R E Q U I V A L E N T A I R
A I R O R E Q U I V A L E N T A I R
S T E A M
S T E A M
S T E A M
Fig. 29 Temperature entrainment ratios Rt i , Rt s
1000
R a POUNDS MOTIVE STEAM PER POUND AIR LOAD
100
10
1.0
0.1
SUCTION PRESSURE MM HG ABSOLUTE
0.01
0.001
0.1
1.0
10
100
1000
0.001
0.01
0.1
1.0
10
100
1000
6.2C 6.2C
5.2C 5.2C
4.2C 4.2C
3.1C 3.1C
3.2C 3.2C
2C 2C
2 NC
2 NC
9 NC
9 NC
1 STAGE
1 STAGE
ATMOSPHERIC PRESSURE
ATMOSPHERIC PRESSURE
6.2C
5.2C
4.2C
3.1C
3.2C
2C
2 NC
9 NC
1 STAGE
ATMOSPHERIC PRESSURE
Fig. 30 Suction pressure versus weight of motive steam
Atmospheric and Vacuum Crude Distillation Units in Petroleum Refineries
185