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US 2012/0258031 A1Published application
Carbon dioxide capture system
AssigneeALSTOM Technology Ltd
InventorsSandra Guidolin, Joseph P. Naumovitz, Peter Kniesburges
Life of this patent
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Abstract
A chilled ammonia capture system for capturing carbon dioxide from a flue gas stream comprises a first absorber and a second absorber. The first absorber operates at a temperature of about 25 to about 50 degrees Celsius. The operating temperature permits the use of a lower circulation rate, which leads to smaller diameter vessels and to fewer recirculation pumps, which in turn leads to lower operating and maintenance costs.
Claims17
A method comprising:
- contacting a flue gas stream with an ammoniated solution within a first absorber;
- wherein the first absorber operates at a temperature of about 25 to about 50 degrees Celsius;
- the ammoniated solution being operative to remove carbon dioxide from the flue gas stream to form a liquid stream that comprises ammonia and about 2 to about 31 weight percent carbon dioxide, based on the total weight of the liquid stream and a gaseous stream that comprises about 3 to about 8 wt % gaseous ammonia and about 2 to about 5 wt % carbon dioxide;
- splitting the liquid stream into a first portion stream and a second portion stream;
- transporting the gaseous stream and the first portion stream to a second absorber;
- wherein the second absorber operates at a temperature of about 5 to about 35 degrees Celsius;
- the second absorber being operative to remove substantially all ammonia from the gaseous stream and the first portion stream;
- recycling ammonia from the second absorber to the first absorber;
- and
- transporting the second portion stream of the liquid stream to a regenerator to separate carbon dioxide from ammonia.
7 more elements
A system comprising:
- a first absorber, where the first absorber is operative to contact a carbon dioxide containing flue gas stream with an ammoniated solution to produce a carbon dioxide rich sol;
- where the first absorber comprises a plurality of stages that facilitate contact between carbon dioxide and ammonia;
- a first splitter disposed downstream of the first absorber;
- the first splitter being operative to split the carbon dioxide rich flue gas stream into a plurality of streams;
- a second absorber;
- where the second absorber is disposed downstream of the first absorber;
- the second absorber being operative to remove substantially all ammonia from at least one stream of the plurality of streams received from the first splitter.
4 more elements
Dependencies are inferred from the claim text.