Process and device for cleaning combustion flue gases

US7776298B2 · kind B2 · utility

Assignee

• Lentjes GmbH · DE

Inventors

• Hansjorg Herden · Rodgau, DE
• Barbara Roth · Hulshout, BE
• Robert Mergler · Frankfurt, DE
• Berthold Stegemann · Bonn, DE
• Harald Sauer · Frankfurt am Main, DE

Key dates

• Filing date: Jul 8, 2002
• Grant date: Aug 17, 2010
• Expiry date: Oct 13, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23J2219/50
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process and a device for the removal of dust, HF, HCl, SO2, SO3, heavy metals, heavy-metal compounds, polyhalogenated hydrocarbons and polycyclic hydrocarbons from combustion flue gases by treating the pollutant-containing combustion flue gases with a sorbent in a circulating fluidized bed. The process is characterized in that the sorbent used is a mixture of Ca(OH)2, at least one naturally occurring zeolite and a carbon-containing substance, in that the treatment of the pollutant-containing combustion flue gases with the sorbent is carried out at from 120 to 180° C. in the presence of water/steam, in that the reactor (3) of the circulating fluidized bed is operated at a gas velocity of from 2 to 10 m/s, a mean residence time of the solids particles in the case of a single pass of from 1 to 10 seconds, and a solids circulation rate of from 10 to 100, where the gas/solid suspension present in the reactor (3) has a mean suspension density of from 1 to 10 kg of solid/Nm3 of flue gas, and in that the removal of the loaded sorbent is carried out by filtration.