glycol purity enhancement methods
TRANSCRIPT
-
In some o
temperatu
glycol be
amount o
gas to en
natural g
with a sm
FB
G
operating sit
ure in the gl
eyond what i
of stripping g
nhance the pu
as that is flo
mall needle v
Fig. 5.13EBook of Gas
Glycol P
tuations, a hi
ycol reboile
is achieved i
gas in the reg
urity of the l
owed into the
valve and is m
ffect of stripProcessors S
urity En
igh glycol pu
r alone. The
in the reboile
generating s
lean glycol s
e hot glycol.
measured by
pping gas oSuppliers A
nhancem
urity is requ
re are severa
er. One such
ection. Fig.
solution. Stri
The flow of
y means of a
n TEG concssociation a
ment Me
uired that can
al ways of en
h method is t
5.13 shows
ipping gas is
f this gas is u
a small rotam
centration (and Gas Pro
ethods
nnot be achie
nhancing the
the applicatio
the effect of
s simply a sm
usually regu
meter.
(after Engincessors Asso
eved by the
e purity of th
on of a smal
f using stripp
mall stream o
ulated manua
neering Dataociation).
he
ll
ping
of
ally
a
-
There are a couple of ways of flowing this gas into the hot glycol. One way is simply to flow the
gas into the glycol below the overflow line from the reboiler to the surge drum or directly into
the glycol in the reboiler vessel through a perforated pipe below the fire tube. The other way is to
install a small packed column between the reboiler and the surge drum and admit the gas at the
base of this column. By contacting the hot glycol with natural gas, an additional small amount of
water is "stripped" from the glycol into the gas, increasing the purity of the lean glycol. If a
packed column is used as a contacting means between the glycol and the stripping gas, the
stripping efficiency is considerably improved, as seen in Fig. 5.13.
The stripping gas that is added to the glycol in the regeneration section is emitted into the
atmosphere with the released water vapor, unless the vapors from the still columns are routed to
a heater or an incinerator, or are captured by a compressor and recompressed.