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GASO ENERGY SYSTEM (INDIA)
PVT. LTD.
GASO
CAN OFFER VARIOUS PSA PROCESS FOR GAS SEPARATION & PURIFICATION IN
TECHNICAL COLLABORATION WITH Carbo Tech Anlagenbau GmbH
| Process |
PSA
LPSA
VPSA
Membrane |
PSA |
VPSA
PSA
|
VPSA
PSA
|
PSA
LPSA
|
VPSA
PSA
|
| Feed |
Air
N2 -off gas |
H2-off gas Natural gas Menthanol
NH2 |
Biogas
Mine Gas
Natural Gas |
Co2-off Gas Flue Gass |
Co2-off Gas Flue Gass |
Ff Gas
Natural Gas |
Product
Purity
Flow (m3/h) |
N2
95-99,999%
1 - 3.000 |
H2
> 99,999%
< - 30,000 |
CH4
> 98%
<10,000 |
CO2
90 / 98%
< 10,000 |
O2
90 / 98%
< 5.00 |
He/Ar
99.99%
< 200 |
| Adsorbent |
CMS |
CMS
Zeolite
Activated-
carbon |
CMS
Activated-
carbon |
CMS
Zeolite
Activated-
carbon |
Zeolite
|
CMS
Zeolite
Activated-
carbon |
PSA PLANT FOR NITROGEN GENERATION
Nitrogen Generation Process Description
(PSA)
Figure 1, shows 2 towers through which purified compressed air
passes through tower 1 where the Oxygen gets absorbed and nitrogen
enriched gas leaves the tower.
A Part of this Nitrogen is used to regenerated through the tower
where at the outlet the gas with 30-35% volume percentage oxygen content
is vented. |
Nitrogen Generation By Membrane Technology
Figure 2 shows the compressed purified air which is passed through
the membrane to be in parallel based on the capacity of flow. The hollow
fibres allows the oxygen molecular to penetrate faster through the
hollow fibres and Nitrogen enriched gas leaves the molecules.
The remaining Oxygen content is effected by the flow velocity through
the hollow fibres. |
Nitrogen Generation By Vaccum Pressure Swing Adsorption
(VPSA)
VPSA - Plants are using the same seperation process as the above
described PSA-Plants. The main difference is the operation pressure of
the unit which <1 bar.
The important advantage of these units is the very low energy
consumption
(approx. 40-70% lower compared to PSA - and - Membrane Units). |
PSA PLANT FOR OXYGEN GENERATION
PSA Plant For Oxygen Enrichment
For the enrichment of oxygen from air to higher concentrations
zeolitic molecular sieves are used, which have the ability to adsorb
nitrogen very well, but not argon. Thus, the oxygen purities are limited
to approx. 95%. Depending on the oxygen production rate various
processes are applied. For oxygen rates up to 300 m3/h a two-adsorber
process is applied. For larger rates three-adsorber plants are used,
which are operated at different pressure levels. |
Three adsorber process for Oxygen Enrichment
The process flow sheet of two-adsorber unit is illustrated in Fig.2
The entire cycle is divided into several intervals.
During the first quarter of the entire cycle air is adsorbed in
adsorber 1 at a pressure of more than 3 bar and an oxygen-rich gas is
produced.
For larger product gas amount, process operates at an adsorption
pressure of 4 to 5 bar, the desorption taking place at the ambient
pressure. |
PSA PLANT FOR HYDROGEN GENERATION
|
The process shown in the flow sheet 1 enables
to produce high purity hydrogen. By utilization of the physical
phenomena that the components beside Hydrogen of Hydrogen containing
feedgases are more or less strongly adsorbed on the adsorption material
at a high pressure level.
The PSA-Hydrogen-unit consists of 4 or more adsorption towers. Each
of these adsorption towers are passing subsequently the following stages
pressure build up, adsorption and regeneration. By this a continuously
provided product gas flow can be achieved. The pressure build up is
carried out by one or more pressure build up step, first of all with the
adsorption tower which is switched over from adsorption to regeneration.
During this step Hydrogen enriched gas is flowing to adsorption tower
for the next adsorption step. The remaining part of the pressure build
up is done with product gas. In the subsequent production step feedgas
is passing the adsorption tower and a gas with very high hydrogen purity
is leaving the adsorption tower.
The regeneration is also done in several steps. After the pressure
equalization with the former regenerated adsorption tower the adsorption
tower is depressurized followed by a purge step with a counter flow of product
gas.
In cases of high contents of heavy hydrocarbon in the feedgas it is
important to use a prefilter system to preclean the feedgas which is
integrated in the PSA-process as shown in flow sheet 2. |
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PSA PLANT FOR METHANE GENERATION
| Process description
Pressure swing adsorption system offers a solution for the production
of Methane (CH4) from a number of feed gases,
In the cases of feed gases with Carbon dioxide (CO2) as the main
component to be removed, enriched Methane (the product gas) with a
purity of up to 99% by volume can be produced at the required or
specified pressure (fig. 1.)) If the main components to be removed are
Nitrogen and Oxygen (N2 and O2), the enriched Methane (product gas) is
produced at atmospheric pressure during regeneration (fig. 2.).
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For feed cases with equal quantities of Carbon dioxide, Nitrogen and
Oxygen, a 2 stage process is used. (Fig. 3).
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The Methane production unit consists mainly of four adsorbers, each
of which passes through three stages - pressure build up, adsorption and
regeneration-In sequence. This configuration ensures a continuous flow
of product gas.
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PSA PLANT FOR CARBON MONOXIDE RECOVERY
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Hydrogen, nitrogen, methane, carbon dioxide and higher hydrocarbons
can be removed from carbon dioxide from blast furnaces gases by using
two-stage processes. In the first pressure swing unit CO2 and the higher
hydrocarbons are removed by adsorption. In the second step carbon
monoxide is adsorbed and subsequently enriched by purging with product
gas. Product gas is recovered by evacuating the adsorbers. Waste gas
from this step is used for purging the upstream component for CO2 and
C2+ removal. The plant consists of four adsorbers per step. A
simplified process flow scheme is illustrated in Fig. 1.
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PSA PLANT FOR CARBON DIOXIDE RECOVERY
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Compared to the other
main components of these gases (nitrogen, oxygen, carbon monoxide)
carbon dioxide is adsorbed to a higher extent on carbon molecular
sieves.
A problem is the interaction with water vapour,
which is also contained in the raw gases at the same time. If dry carbon
dioxide is to be recovered a drying of the gases prior to the PSA plant
is resonable.
The PSA process for carbon dioxide recovery
operates at an adsorption pressure of 1.1 to 1.5 bar and reduces the
pressure to values below 200 mbar for desorption. The simplified process
flow scheme is illustrated in Fig. 1 |
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PSA PLANT FOR OZONE RECOVERY
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This process cannot be
classified so easily as the above processes. In this case the PSA plant
has a dual function; the enrichment of oxygen from air to operate the
ozonier and the enrichment of the ozone with the conversion of the
enriched ozone in a nitrogen stream. The simplified process flow sheet
is illustrated in Fig. 1
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