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US 4,273,747 AGranted
Process for removal of mercury vapor from waste gases
AssigneeA/S Niro Atomizer
InventorElisabeth L. Rasmussen
Life of this patent
Estimating the term…
Abstract
Mercury is removed from a stream of hot waste gases by atomizing an aqueous liquid into the hot waste gases in the presence of fly ash suspended in the gas stream. Subsequently the fly ash is separated from the gas stream. A substantial part of the mercury originally present in the gas stream is absorbed or adsorbed by the fly ash so that the stream of the waste gas can safely be discharged to the atmosphere.
Claims4
A process for removal of mercury vapor from a stream of fly ash-containing waste gas resulting from the incineration of refuse, said stream having a temperature of at least 200.degree. C., comprising the steps of
- (a) atomizing an aqueous liquid into said stream without previous removal of fly ash therein, said liquid being atomized in a quantity higher than the one which would cool said stream to a temperature of 160.degree. C., but which quantity is lower than the one which would give incomplete water evaporation from the atomized liquid or condensation of water vapor in subsequent handling of the gas stream, and
- (b) separating the fly ash together with a substantial part of the mercury originally present as vapor in a particle collector unit.
Dependencies are inferred from the claim text.