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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

                   N2 H2 CH4 CO2 O2 He/Ar
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.

 

 

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,

  • Biogas from digesters

  • Biogas from sewage treatment Plants

  • Biogas from liquid manure towers

  • Landfill gas

  • Natural coalbed gas.

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.).

 

 

 

 

For feed cases with equal quantities of Carbon dioxide, Nitrogen and Oxygen, a 2 stage process is used. (Fig. 3).



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.

PSA PLANT FOR CARBON MONOXIDE RECOVERY

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.

 

PSA PLANT FOR CARBON DIOXIDE RECOVERY

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

PSA PLANT FOR OZONE RECOVERY

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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