Page 135 - Petroleum Production Engineering, A Computer-Assisted Approach

Guo, Boyun / Computer Assited Petroleum Production Engg 0750682701_chap10 Final Proof page 130 4.1.2007 8:26pm Compositor Name: SJoearun

10/130 EQUIPMENT DESIGN AND SELECTION
Table 10.12 Specific Gravity Correction Factors for C t ¼ 1:01 and C g ¼ 0:97. The gas capacity of contactor is
Packed Glycol Contactors calculated with Eq. (10.7):
Gas-specific gravity (air ¼1) Correction Factor (C g ) 12
q s ¼ ¼ 12:25 MMscfd:
(1:01)(0:97)
0.55 1.13
0.60 1.08 Figure 10.10 gives contactor diameter D C ¼ 30 in.
0.65 1.04 Figure 10.6 gives water content of inlet gas:
0.70 1.00 C wi ¼ 50 lb m =MMscf.
0.75 0.97 The required water content of outlet gas determines the
0.80 0.94 dew-point temperature of the outlet gas through Fig. 10.6:

0.85 0.91 t do ¼ 28 F.
0.90 0.88 Therefore, the dew-point depression is Dt d ¼ 90 28

¼ 62 F.
Source: Used, with permission, from Sivalls, 1977. Based on GWR ¼ 3 gal TEG=lb m H 2 Oand Dt d ¼ 62 F,

Fig. 10.12 gives the number of trays rounded off to be
The required minimum height of packing of a packed four.
contactor, or the minimum number of trays of a trayed
contactor, can be determined based on Fig. 10.12. Glycol Re-concentrator: Sizing the various components
of a glycol re-concentrator starts from calculating the
required glycol circulation rate:
Example Problem 10.2 Size a trayed-type glycol contactor
for a field installation to meet the following requirements:
(GWR)C wi q
q G ¼ , (10:8)
Gas flow rate: 12 MMscfd 24
Gas specific gravity: 0.75 where
Operating line pressure: 900 psig
Maximum working pressure 1,440 psig q G ¼ glycol circulation rate, gal/hr
of contactor: GWR ¼ GWR, gal TEG=lb m H 2 O
Gas inlet temperature: 90 8F C wi ¼ water content of inlet gas, lb m H 2 O=MMscf
Outlet gas water content: 6 lb H 2 O=MMscf q ¼ gas flow rate, MMscfd
Design criteria: GWR ¼ 3 gal TEG=lb m Reboiler: The required heat load for the reboiler can be
H 2 O with 99.5% TEG approximately estimated from the following equation:
Solution Because the given gas is not a standard gas and
H t ¼ 2,000q G , (10:9)
the inlet temperature is not the standard temperature,
corrections need to be made. Tables 10.9 and 10.10 give where

140
OD, in.
120 12
15
18
100 20
24
Gas Capacity (MMscfd) 80 36
30

42
48
60
54
60
66
40 72

20

0
0 200 400 600 800 1,000 1,200
Operating Pressure (psia)
Figure 10.10 Gas capacity for trayed glycol contactors based on 0.7-specific gravity at 100 8F (Sivalls, 1977).