System for recovery of ammonia from lean solution in a chilled ammonia process utilizing residual flue gas
AssigneeALSTOM Technology Ltd
InventorsJalal Askander, Fred Kozak
Life of this patent
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Abstract
Disclosed herein is a method comprising contacting a residual flue gas stream with a lean solution stream in an appendix stripper; where the residual flue gas stream comprises nitrogen, oxygen and moisture; and where the lean solution stream comprises ammonium, ammonium carbonate, ammonium bicarbonate and ammonium sulfate; forming a vapor phase that comprises ammonia vapor, water vapor, carbon dioxide and nitrogen; forming a liquid phase that comprises water, ammonium sulfate and ammonia; discharging the vapor phase to a capture system; and discharging the liquid phase to a direct contact cooler.
Claims18
A method comprising:
- contacting a residual flue gas stream with a lean solution stream in an appendix stripper;
- where the residual flue gas stream comprises nitrogen, oxygen and moisture;
- and
- where the lean solution stream comprises ammonium, ammonium carbonate, ammonium bicarbonate and ammonium sulfate;
- forming a vapor phase that comprises ammonia vapor, water vapor, carbon dioxide and nitrogen;
- forming a liquid phase that comprises water, ammonium sulfate and ammonia;
- discharging the vapor phase to a capture system;
- and
- discharging the liquid phase to a direct contact cooler.
A system comprising:
- a capture system;
- the capture system being operative to produce a residual flue gas stream by absorbing carbon dioxide from a flue gas stream by contacting it with an ionic solution comprising ammonia;
- a regeneration system in fluid communication with the capture system;
- the regeneration system being operative to remove carbon dioxide from the ionic solution to form a lean ionic solution;
- a direct contact heater;
- the direct contact heater being in fluid communication with the capture system and being operative to heat the residual flue gas stream;
- and
- an appendix stripper;
- the appendix stripper being operative to facilitate contact between the residual flue gas stream and the lean solution stream.
Dependencies are inferred from the claim text.