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US 9,427,695 B2Granted
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.
Claims10
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 and form a stream rich in ammonia;
- recycling at least a portion of the stream rich in ammonia from the second absorber to the first absorber;
- transporting the second portion stream of the liquid stream to a regenerator to separate carbon dioxide from ammonia;
- and
- splitting the stream rich in ammonia that emanates from the second absorber into three separate streams, one of which is recycled to the second absorber and one of which is blended with the second portion stream of the liquid stream.
8 more elements
Dependencies are inferred from the claim text.