Methods for reducing NOx in combustion flue gas using metal-containing additives

US6471506B1 · kind B1 · utility

Assignee

• GE Energy and Environmental Research Corporation · US

Inventors

• Vladimir Zamansky · Oceanside, US
• Peter Martin Maly · Reinbek, DE
• Jerald A. Cole · Long Beach, US
• Vitali Victor Lissianski · San Juan Capistrano, US
• William Randall Seeker · San Clemente, US

Key dates

• Filing date: Nov 6, 2000
• Grant date: Oct 29, 2002
• Expiry date: Nov 6, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23J2219/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Various methods for decreasing the amount of nitrogen oxides released to the atmosphere as a component of combustion gas mixtures are provided. The methods specifically provide for the removal of nitric oxide and nitrogen dioxide (NOx) from gas mixtures emitted from stationary combustion systems. In particular, methods for improving efficiency of nitrogen oxide reduction from combustion systems include injecting metal-containing compounds into the main combustion zone and/or the reburning zone of a combustion system. The metal containing compounds react with active combustion species, and these reactions change radical concentrations and significantly improve NOx conversion to molecular nitrogen. The metal-containing additives can be injected with the main fuel, in the main combustion zone, with secondary or reburning fuel addition, or at several locations in the main combustion zone and reburning zone. Optionally, nitrogenous reducing agents and/or overfire air can be injected downstream to further increase NOx reduction.