| 摘要 |
Method and apparatus are disclosed which are improvements in the conventional method and apparatus for extracting water from a produced natural gas stream by contacting the stream with a glycol to absorb the water, and then regenerating the glycol for further use in extraction by heating the moist glycol in a glycol regenerator to vaporize the water contained in same as steam. The improvement enables control of emissions of volatile organic compounds which have been absorbed by the glycol during contact with the natural gas stream, while minimizing the contaminants in the water streams produced. The vented steam and gaseous volatile organics are flowed from the glycol regenerator as input to the bottom of a steam stripper column. The vapors from the top of the steam stripper column are flowed to a cooling condenser to produce a condenser water stream having a relatively high content of the organic compounds. The condenser water stream is passed to the top of the steam stripper and then through the stripper in counter-current relation to the vented gases and steam, whereby the condenser water stream is stripped of substantial parts of its organics content and emerges from the bottom of the stripper column as a stripped water stream having low content of the organics. Optional steps for further reducing the organic content of the water produced are air stripped, steam stripping, and contacting with activated carbon.
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