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Molecular sieve dehydration skid is a key device in natural gas purifying or natural gas conditioning. Molecular sieve is an alkali metal aluminosilicate crystal with framework structure and uniform microporous structure.
Molecular sieve dehydration skid is a key device in natural gas
purifying or natural gas conditioning. Molecular sieve is an alkali
metal aluminosilicate crystal with framework structure and uniform
microporous structure. When the feed gas containing trace water
passes through the molecular sieve bed at room temperature, the
trace water and mercaptan are absorbed, thus reducing the water and
mercaptan content in the feed gas, realizing the purpose of
dehydration and desulfurization. the adsorption process of
molecular sieve is usually carried out at low temperature and high
pressure, while the desorption regeneration is carried out at high
temperature and low pressure. Under the action of high temperature,
clean and low pressure regeneration gas, the molecular sieve
adsorbent releases the adsorbate in the micropore into the
regeneration gas flow until the amount of adsorbate in the
adsorbent reaches a very low level, and has the ability to absorb
water and mercaptan from the feed gas, realizing the regeneration
and recycling process of molecular sieve.
Molecular sieve method is a kind of deep dehydration method, which
is often used in low-temperature condensation separation process,
such as natural gas condensate (NGL) recovery and dehydration
process in the production of liquefied natural gas (LNG). In
addition, molecular sieve dehydration is also used in the
production of compressed natural gas for automobile fuel.
Molecular sieve dehydration is generally applicable to the
following occasions:
a. Where the dew point of natural gas is required to be lower than
-40 ℃.
b. It is suitable for hydrocarbon dew point control of lean high
pressure natural gas.
c. Natural gas is dehydrated and purified at the same time.
d. When the natural gas containing H2S is dehydrated and dissolved
in glycol, it will cause the emission of regeneration gas.
e. When LPG and NGL dehydration need to remove trace sulfide (H2S,
CO,COS, CS2, mercaptan) at the same time.
Fixed bed adsorbers are used for molecular sieve dehydration, so
the unit should have at least two adsorbers, one in adsorption
dehydration stage, the other in regeneration and cooling stage.
When the capacity of the unit is very large, the multi tower
process can also be arranged.
Technical parameters