AMR Process Inc
designs, and fabricates gas dehydration process packages which
include glycol dehydration, glycol regeneration
units, and molecular sieve dehydration units. AMR Process glycol
dehydration & glycol regeneration packages incorporate advanced engineering designs, high
technology internals, and proven track records.
It is necessary
to remove water
from natural gas in order to prevent hydrate formation and to
reduce corrosion. The formation of hydrates can be prevented by
inhibiting hydrate formation in the free water phase or by
gas dehydration to prevent a free water phase.
Glycol dehydration units or TEG
dehydration units are the most economical type of natural gas
dehydration where dew points depressions of 60° to 120°F are
required. Triethylene glycol (TEG) is the most common type of
glycol use for
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Water Content of Natural Gas
This spreadsheet calculates the
water content of natural gas (assuming 17.4 MW / 0.6 SG gas).
Please note that these values will be in error if the gas
contains more than a total of 5% CO2 & H2S
as acid gas correction factors need to be applied. You can use
this spreadsheet to calculate the required dew point depression
for the TEG dehydration unit.methanol
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Process Description of Glycol Dehydration
Units
In the glycol dehydration process TEG is pumped to the top of a
contactor tower where it is flow countercurrent with wet gas
flowing up the tower, utilizing internal high efficiency
structured packing for larger gas flows, or trays for smaller
tower sizing, for efficient gas/liquid contacting. The TEG
adsorbs water from the wet gas and is passed to the glycol
regeneration unit where, very simply, adsorbed gases are flashed
off and the water is removed from the reboiler by heating the
wet glycol to around 400ºF at atmospheric conditions. The
regenerated TEG is then pumped back to the contactor tower
inlet.
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Where high dew point depressions
are required in the TEG dehydration process, high purity glycol
regeneration is required. High purity
glycols can be regenerated by utilizing stripping gas (dry
natural gas) in the reboiler.
Molecular Sieve Dehydration
Molecular sieves
will adsorb the highest amount of water, will produce the lowest
water dew points and will also simultaneously sweeten and dry
gas. Molecular sieve dehydration units are also much more
expensive.
Type of
Molecular Sieve
Molecular sieves
are adsorbents made up of aluminosilicate crystalline polymers (zeolite),
which remove polar components such as water, methanol, CO2
& H2S. They come in may forms including beads,
granulars, extrudate & pellets. The molecular sieve, type, size,
& shape selection is determined by the operation.
Process
Description of Molecular Sieve Dehydration Units
Typical
performance of molecular sieve dehydration unit:
Water outlet
< 0.1 ppm (vol)
H2S
outlet < 1 ppm (vol)
CO2
outlet < 50 ppm (vol)
The process
requires two or more adsorption towers, with one on-line
removing water whilst the others are being regenerated. The
adsorption tower is typically removing water for around eight to
twelve hours. The bed is regenerated by heating the molecular
sieve to around 450° to 500°F using a slip
stream of dry process gas. The regeneration gas is returned to
the process after it has been cooled and the free water removed
.
AMR Process can offer the correct selection of
hydrate inhibitor or gas dehydration equipment to meet client's
requirements. AMR Process can supply glycol dehydration & glycol
regeneration, and molecular sieve gas dehydration units and
designs. AMR Process can supply process designs or supply
the complete package, according to end user location,
fabrication location, or client preferences.