Methods of controlling mercury emission

US8632742B2 · kind B2 · utility

Assignee

• Nalco Company LLC · US

Inventors

• Bruce A. Keiser · Plainfield, US
• Jitendra Shah · Naperville, US
• John V. Meier · Chicago, US
• Robert Dorner · Hannover, DE
• Jianwei Yuan · Cumming, US
• Rebecca L. Stiles · Naperville, US
• Wayne M. Carlson · Batavia, US
• Darlington Mlambo · Naperville, US

Key dates

• Filing date: Oct 22, 2012
• Grant date: Jan 21, 2014
• Expiry date: Oct 22, 2032

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2257/602
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Disclosed are methods for controlling, mercury emissions, and more particularly, to methods for controlling mercury re-emissions from a wet flue gas desulfurizer used in a combustion process. A method of controlling mercury re-emission from a combustion process includes measuring either mercury concentration, oxidation-reduction, potential (ORP), and/or sulfide concentration within a scrubber liquor of a wet flue gas desulpherizer (wFGD); correlating the mercury concentration, ORP, and /or sulfide concentration with an amount of mercury re-emission additive required in the scrubber liquor to reduce and/or prevent mercury re-emission to a selected level; and adjusting the rate of addition of mercury re-emission additive into the scrubber liquor to attain the selected level of mercury re-emission.