摘要 |
Feed gas ( 1 ) in an improved NGL processing plant is cooled below ambient temperature and above hydrate point of the feed gas to condense heavy components ( 6 ) and a significant portion of water ( 4 ) contained in the feed gas. The water ( 4 ) is removed in a feed gas separator ( 101 ) and the condensed liquids are fed into an integrated refluxed stripper ( 104 ) that operates as a drier/demethanizer for the condensed liquids, and the uncondensed portion ( 5 ) containing light components is further dried ( 106 ) and cooled prior to turboexpansion ( 23 ) and demethanization ( 112 ). Consequently, processing of heavy components in the cold section is eliminated, and feed gas with a wide range of compositions can be efficiently processed for high NGL recovery at substantially the same operating conditions and optimum expander efficiency.
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