Process of afterburning and purifying process exhaust gases

US4539188A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Martin Hirsch · Friedrichsdorf, DE
• Wolfram Schnabel · Idstein, DE
• Harald Sauer · Frankfurt am Main, DE
• Hans-Werner Schmidt · Bayreuth, DE

Key dates

• Filing date: Feb 29, 1984
• Grant date: Sep 3, 1985
• Expiry date: Feb 29, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for afterburning and purifying process exhaust gases, which contain combustible constituents, wherein the process exhaust gases and the oxygen-containing gases required for a combustion are separately supplied to a fluidized bed reactor of a circulating fluidized bed. In the fluidized bed reactor, the gas velocity is adjusted to 2 to 10 m/s (empty pipe velocity), the mean suspension density is adjusted to 0.1 to 10 kg/m.sup.3, the temperature is adjusted to 700.degree. to 1100.degree. C., and the stoichiometric ratio of gas-purifying agent having a particle size d.sub.p 50 of 30 to 200 .mu.m to pollutant contained in the process exhaust gas or formed by the combustion is adjusted to 1.2 to 3.0, calculated as Ca:S. The entrained solids in the gases from the fluidized-bed reactor are recycled to the reactor at a rate of at least 5 times the weight of solids contained in the fluidized bed reactor per hour.