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US 10,603,629 B2Granted
Mercury emission control from a wet flue gas scrubber
AssigneeGeneral Electric Company
InventorsTrevor James Dale, Raymond Gansley, Pererik Appelo
Life of this patent
Estimating the term…
Abstract
Methods and systems for control and adjustment of the feed rate of mercury reemission control additives (MECA) to a wet flue gas desulfurization system. Predetermined sulfite concentration values are compared to actual sulfite concentrations measured in the scrubber liquid. The MECA feed to the recirculating scrubber liquor is then adjusted and regulated as a result of such comparisons.
Claims24
A method for reducing mercury emission or re-emission levels in combustion flue gas comprising:
- (a) supplying a combustion flue gas to a WFGD system for contact with an aqueous alkaline slurry to reduce contaminants from the flue gas to produce a cleaned flue gas;
- (b) measuring a sulfite concentration of the aqueous alkaline slurry using a sulfite sensor in operative association with the WFGD system and comparing it to a predetermined sulfite concentration level;
- (c) adjusting an amount of MECA fed to said slurry in response to said comparison made in (b).
A method for reducing mercury emissions or re-emission levels in combustion flue gas comprising:
- (a) supplying a combustion flue gas to a WFGD system for contact with an aqueous alkaline slurry to reduce contaminants from the flue gas to produce a cleaned flue gas;
- (b) measuring a sulfite concentration of the aqueous alkaline slurry using a sulfite sensor in operative association with the WFGD system and comparing it to a first predetermined sulfite concentration level;
- (c) adjusting an amount of oxidation air fed to the WFGD system in response to said comparison to said first predetermined sulfite concentration parameter made in (b);
- (d) providing a second predetermined sulfite concentration level correlated to a desired amount of MECA in said slurry;
- (e) comparing said sulfite concentration to said second predetermined sulfite concentration level;
- and
- (f) adjusting an amount of MECA fed to said slurry in response to said comparison made in (e).
4 more elements
A system for reducing mercury emission or re-emission levels in a combustion flue gas comprising:
- (a) a WFGD system having an aqueous alkaline slurry therein for contacting a combustion flue gas flowing through said WFGD system;
- (b) a slurry reservoir for collecting the aqueous alkaline slurry following contact with the combustion flue gas;
- (c) a sulfite monitor operatively associated with said reservoir for measuring sulfite concentration of said aqueous alkaline slurry to obtain a measured sulfite concentration;
- (d) a control device receiving a signal from said sulfite monitor corresponding to said measured sulfite concentration and adapted to compare said measured sulfite concentration measurement to a predetermined sulfite concentration that is correlated to a desired amount of MECA in said aqueous alkaline slurry;
- (e) a MECA feed mechanism controlled by said control device to adjust the feed of MECA to said aqueous alkaline slurry in response to comparison of said measured sulfite concentration to said predetermined sulfite concentration.
2 more elements
A system for reducing mercury emission or re-emission levels in a combustion flue gas comprising:
- (a) a WFGD system having an aqueous alkaline slurry therein for contacting a combination flue gas flowing through said WFGD system;
- (b) a slurry reservoir for collecting the aqueous alkaline slurry following contact with the combustion flue gas;
- (c) a sulfite monitor operatively associated with said reservoir for measuring sulfite concentration of said aqueous alkaline slurry to obtain a measured sulfite concentration;
- (d) a control device receiving a signal from said sulfite monitor corresponding to said measured sulfite concentration and adapted to compare said measured sulfite concentration measurement to a first predetermined sulfite concentration that is correlated to a desired amount of oxidation air fed to said WFGD system, said control device also adapted to compare said measured sulfite concentration measurement to a second predetermined sulfite concentration that is correlated to a desired amount of MECA in said aqueous alkaline slurry;
- (e) an oxidation air feed mechanism controlled by said control device to adjust the feed of oxidation air to said WFGD system in response to comparison of said measured sulfite concentration measurement to said first predetermined sulfite concentration;
- and
- (f) a MECA feed mechanism controlled by said control device to adjust the feed of MECA to said aqueous alkaline slurry in response to comparison of said measured sulfite concentration to said second predetermined sulfite concentration.
4 more elements
Dependencies are inferred from the claim text.