Gas treating method and apparatus
A method and apparatus for treating natural gas comprises a contactor having a manifold for spreading gas in the contactor vessel, a plurality of perforated plates above the manifold, a spray system for spraying a treating liquid into an upwardly rising column of gas and a liquid level controller for maintaining the treating liquid above the perforated plates. Gas and liquid from the contactor pass through a cooler and are then separated. A treating liquid regeneration system receives the treating liquid and flashes the liquid at low pressure to separate hydrocarbon gases, hydrocarbon liquid and treating liquid. The treating liquid is regenerated by heating and flashing off contaminant gases and is ultimately redelivered to the contactor.
1. A system for treating a contaminated gas comprising:
a vessel comprising:
a pool of contaminant-absorbing liquid comprising a hydrogen sulfide scavenger;
a manifold for introducing the contaminated gas into the vessel, wherein the manifold introduces the gas into the vessel below the top level of the pool of contaminant-absorbing liquid;
at least one flow disperser contained within the vessel and positioned above the manifold and beneath the level of the pool of contaminant absorbing liquid;
one or more spray nozzles contained within the vessel and positioned above the level of the pool of contaminant-absorbing liquid, operable to introduce contaminant-absorbing liquid counter-current to the flow of contaminated gas in the vessel; and
a drain for removing the contaminant-absorbing liquid from the vessel;
a cooler operable for receiving contaminated gas and contaminant absorbing liquid from the vessel, wherein the cooler reduces the temperature of the received contaminated gas and contaminant absorbing liquid;
a separator operable to separate the cooled contaminant-absorbing liquid from the cooled contaminated gas; and
a heat exchanger operable to reheat the contaminant-absorbing liquid after the contaminant-absorbing liquid leaves the separator.
2. The system of claim 1 further comprising:
a heater operable to receive contaminant-absorbing liquid from the heat exchanger; and
a flash separator operable to receive the heated contaminant-absorbing liquid from the heater and further operable to separate contaminants from the contaminant-absorbing liquid.
3. The system of claim 2 wherein the contaminant-absorbing liquid exiting the flash separator is introduced into the heat exchanges as the heat source.
4. The system of claim 2 further comprising a circulation pump operable to reintroduce the contaminant-absorbing liquid into the vessel.