Gas treating or sweetening is a term used to describe the various processes for the removal of certain contaminants from natural gas, preliminary H2S and CO2.
Gas Inlet Filters
The first step for natural gas is the gas inlet filter. Here the liquid hydrocarbons and solids are being removed. Haze eliminators, inlet vanes or coalescing filters can be used for this process.
A combination of various techniques in series is the optimum to remove al particles and liquids.
Lean Amine Filtration
Carbon filtration removes surface active contaminants, hydrocarbons, corrosion inhibitors, amines degradation products and oils. It also reduces the tendency of the amine solution to foam inside the stripper.
At the inlet side of the carbon filter, a cartridge filter is installed preventing particles from blocking the activated carbon. All of this results in a reduction of operational- and maintenance costs.
To reduce the running costs, a self cleaning candle filter can be installed on the inlet side. The polishing step in the lean amine stream is a cartridge guard filter at the outlet of the carbon filter. This is necessary to prevent carbon fines to enter the amine circuit.
Rich Amine Filtration
When the amine system is extremely contaminated, filtration of the rich amine stream may be required. It prevents the heat exchanger from plugging.
There is also the concern that under certain conditions, in the regenerator, the FeS in the rich amine stream can dissociate into soluble iron compounds. These will not be removed with the filtration of the lean amine. Here we advise the use of a self cleaning pre coat type filter.
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