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Optimization of Energy Consumption during Natural Gas Dehydration
of Hassan Gas field dehydration unit used
in this analysis are shown in Table. 2
Regeneration of TEG consumes a high
amount of energy. Number of iterations was
made by forming the sets of TEG flow rate
and concentration, from flow rate 3.5 to 3.0
gal/lb m of water and concentration from 99.0
to 99.9%, a constant variation of 0.1 gal. /
lb m of water and 0.1% was made in flow rate
and concentration respectively.
Table 1. Gas composition prior to the
dehydration.
Table Table 3. 3. Calculated parameters and and
Operating conditions of the dehydration
unit,
operating
Hassan gas
conditions
field
of the
dehydration unit, Hassan gas field
TEG- Gas Contactor
Outlet temperature 34°F
Dew point depression 86°F
Water Removed 68.1 lb m / hr
TEG Concentration in 96.01%
Rich Solution
TEG Concentrator
Circulation Rate 238.42 gal/ hr
TEG sensible heat 281.960 BTU/ hr
Heat of vaporization for 66,097 BTU/ hr
Water
Heat vaporized the 16,925.25BTU/ hr
water reflux
Heat Losses of 10,000 BTU/ hr
Reboiler
Total Heat in Reboiler 374573.2 BTU/ hr
TEG losses
7.153 gal/ hr
RESULTS AND DISCUSSION
It was observed that when the Glycol (TEG)
to water ratio is decreased from 3.5 to 3.0
Gallon TEG / lb m of H 2 O, simultaneously the
Lean TEG flow rate at the top of the
absorption column is also decreased from
238.42 to 204.36 gal/hr. as shown in Figure
2.
Table 2. Available data of Hassan Gas Filed
dehydration unit
Figure 2. Relation of flow rate and glycol
water ratio.
Figure 3 indicates the Rich TEG
concentration when lean TEG concentration
flowed on the top of the absorption column
at different flow rates ranging from 3.0 to 3.5
Gallon TEG / lb m of H 2 O. This shows that as
the Lean TEG concentration and GWR
increased, the concentration of Rich TEG
also increases. This supports the proposed
energy saving plan parameters for Hassan
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