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US 9,174,165 B1Granted
Acidic gas removal using dry sorbent injection
AssigneeALSTOM Technology Ltd
InventorSanjay Kumar Dube
Life of this patent
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Abstract
A system and method for desulfurization or acidic gas removal from a hot flue gas is provided that uses a dry sorbent injection technology with downstream sorbent reproduction based on a dual-alkali process. As such, lime and flue gas carbon dioxide are used in a process to produce the dry sorbent, sodium bicarbonate.
Claims15
A dry flue gas desulfurization system comprising:
- an injector operable to inject a sorbent into a duct through which plant flue gas flows to a particulate collection device for flue gas acid gas removal by the sorbent;
- filters within the particulate collection device operable to collect spent sorbent from flue gas flowing therethrough;
- an alkali reactor operable for reaction of spent sorbent, lime, water and air to produce sodium hydroxide and gypsum;
- and
- a carbon dioxide absorber operable for reaction of sodium hydroxide with flue gas carbon dioxide to produce sorbent for injection.
2 more elements
A method of dry flue gas desulfurization comprising:
- injecting a sorbent into a duct through which plant flue gas flows to a particulate collection device for flue gas acid gas removal by the sorbent;
- collecting with filters within the particulate collection device spent sorbent from flue gas flowing therethrough;
- reacting spent sorbent, lime, water and air to produce sodium hydroxide and gypsum;
- and
- reacting sodium hydroxide with flue gas carbon dioxide to produce sorbent for injection.
2 more elements
Dependencies are inferred from the claim text.