GPE can design and execute gas dryers and treaters for almost all process gases using both temperature swing adsorption and pressure swing adsorption.
Common impurities that can be removed from a gas stream include water, carbon dioxide, carbon monoxide, mercaptan, ammonia, methyl alcohol, ethyl alcohol, hydrogen sulphide, oxygenates, acetylenes, nitrous oxide, nitrogen dioxide, propyne, and butyne. Some of these can be removed with the same adsorbent used for dehydration. For some, a separate adsorbent that can be regenerated is filled in the same bed. Some of the impurities cannot be removed by regenerable adsorbents. Here a separate bed with “sacrificial” adsorbent is used (Guard Bed) and operated up to complete equilibrium.
With a two bed system, the entire wet gas flows through the adsorption bed. Simultaneously, the bed in regeneration is being reactivated by flowing hot gases from various sources for a specific period of time. This is followed by a cooling phase. Depending on the flow rate, multiple beds are also used to keep adsorber size within manufacturing limits. The flow for adsorption is divided into two or more beds and one bed is regenerated. A single bed is taken into adsorption after regeneration and the time for adsorption per bed is determined by the regeneration time and the total number of installed beds.
In temperature swing adsorption the following standard regeneration possibilities can be offered.
- Heat of compression- wet gas heating / dry gas cooling – closed loop
- Split flow – wet gas heating / dry gas cooling – closed loop
- Open loop external dry gas heating and cooling
- Open loop nitrogen heating and cooling
- Closed loop / semi-closed loop nitrogen heating and cooling
- Closed loop dry gas heating and cooling
- Single stream regeneration for multiple dehydration streams