Process for the treatment of gas phase alkaline chloride in a combustion plant

US8318118B2 · kind B2 · utility

Assignee

• VATTENFALL AB · SE

Inventors

• Matts Ahlmark · Stockholm, SE
• Magnus Berg · Stockholm, SE

Key dates

• Filing date: Apr 13, 2009
• Grant date: Nov 27, 2012
• Expiry date: Dec 5, 2030

Classification

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

Abstract

A process for the treatment of gas phase alkaline chlorides in a combustion plant that is arranged for combustion of solid fuel and which includes a combustion chamber from which a flue-gas flow is directed to pass a heat transfer device. A phosphorous substance is added to the flue-gas flow, separate from the fuel, the substance chosen from a group of substances that form phosphorous oxide at combustion temperatures of approx. 500° C. or above, wherein the phosphorous substance is distributed in the flue-gas at a location upstream of the heat transfer device. The phosphorous substance is added to an amount which results in phosphatising of gas phase alkaline chlorides included in the flue-gas flow before the chlorides reach the heat transfer device. A corresponding combustion plant is disclosed, as well as the use of a phosphorous substance for phosphatising alkaline chloride in gaseous phase in a flue-gas flow.