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US 7,879,135 B2Granted
Configurations and methods for claus plant operation with variable sulfur content
AssigneeFluor Technologies Corporation
InventorsRavi Ravikumar, Gordon Sims, Harold Sandler
Life of this patent
Estimating the term…
Abstract
Contemplated plants include an acid gas enrichment unit in which acid gas unsuitable for feeding into a Claus plant from an upstream acid gas removal unit is separated into a concentrated hydrogen sulfide stream that is fed to the Claus plant and a carbon dioxide stream that is compressed in a compressor before sequestration, further purification, and/or recycling to a gasification unit.
Claims20
A method of treating a feed gas, comprising:
- providing a first acid gas removal unit that produces from a feed gas with variable hydrogen sulfide content a first acid gas comprising carbon dioxide and variable amounts of hydrogen sulfide;
- providing a second acid gas removal unit that produces from the first acid gas a concentrated hydrogen sulfide stream and a carbon dioxide offgas stream;
- determining the hydrogen sulfide content in at least one of the feed gas and the first acid gas;
- and
- feeding the concentrated hydrogen sulfide stream and the first acid gas in a ratio to a Claus plant, wherein the ratio is determined by the content of the hydrogen sulfide in at least one of the feed gas and the first acid gas.
2 more elements
A plant comprising:
- a first acid gas removal unit configured to remove acid gas from a feed gas having variable hydrogen sulfide content to thereby provide a first acid gas stream that comprises carbon dioxide and variable amounts of hydrogen sulfide;
- a second acid gas removal unit fluidly coupled to the first acid gas removal unit and configured to receive the first acid gas stream and to provide a concentrated hydrogen sulfide stream and a carbon dioxide offgas stream;
- a Claus plant configured to receive at least part of the concentrated hydrogen sulfide stream and the first acid gas stream;
- and
- a control unit that is configured to direct at least one of the first acid gas stream and the concentrated hydrogen sulfide stream to the Claus plant as a function of a hydrogen sulfide concentration in at least one of the feed gas and the first acid gas stream.
2 more elements
A method of modifying a gasification plant, comprising:
- determining that gasification of a low-sulfur feedstock will result in an acid gas stream in an acid gas removal unit of the gasification plant that is not suitable for feeding to an existing Claus plant;
- coupling an acid gas enrichment unit to the gasification plant such that the enrichment unit produces a carbon dioxide stream and a concentrated hydrogen sulfide stream from the acid gas stream;
- and
- coupling the acid gas enrichment unit to the Claus plant such that the concentrated hydrogen sulfide stream is fed to the Claus plant and such that the carbon dioxide stream is provided to a tail gas recycle compressor.
1 more element
Dependencies are inferred from the claim text.