Integrated approach to reduction of mercury emissions
AssigneeGeneral Electric Company
InventorsVitali Lissianski, Randy Seeker, Peter M. Maly
Life of this patent
Estimating the term…
Abstract
Method for reducing mercury emissions from coal-fired combustion comprising staging of a combustion unit to remove mercury with fly ash from the flue gas, introducing activated carbon to remove mercury from the flue gas, and collecting the fly ash, activated carbon, and associated mercury in a particulate control device.
Claims52
Method for reducing mercury gas emissions from a coal-fired combustion system comprising a coal combustion unit and a first particulate control device downstream of the coal combustion unit, the method comprising the steps of:
- combusting coal in the combustion unit under staging conditions so that coal combustion is incomplete resulting in increased carbon in ash content;
- releasing mercury into the flue gas generated by coal combustion;
- introducing at least one mercury-oxidizing additive into the flue gas downstream of the combustion unit and upstream of the first particulate control device for increasing oxidation of mercury in the flue gas;
- removing at least one portion of the mercury by fly ash in the flue gas;
- and
- collecting the fly ash and associated mercury with the first particulate control device.
Method for reducing mercury gas emissions from a coal-fired combustion system comprising a coal combustion unit and a first particulate control device downstream of the coal combustion unit, the method comprising the steps of:
- combusting coal in the combustion unit under staging conditions so that mercury is released into flue gas generated by coal combustion and at least one portion of the mercury is removed by fly ash in the flue gas;
- introducing activated carbon into the flue gas upstream of the first particulate control device, the activated carbon removing at least a second portion of the mercury;
- and collecting the fly ash, activated carbon, and associated first and second portions of mercury with the first particulate control device.
Dependencies are inferred from the claim text.