Von Roll Umwelttechnik Ag

Von Roll Ag

Rudolf Frey

Felix Koller

Rainer Flury

A filter device for adsorption of gaseous constituents from a gas flow includes a filter chamber with filters arranged therein, a clean-gas chamber connected to the first chamber in a fluid-conducting manner via the filters, and a collection chamber arranged beneath the filter chamber, is open toward the filter chamber and has an interior which narrows toward the bottom. An unfiltered-gas duct which leads from the outside, is arranged in the lower area of the collection chamber in such a manner that it can be adjusted in the direction toward the filters. A dust-discharge device, which leads toward the outside, is arranged in the lower area.

Device and process for adsorption or chemisorption of gaseous constituents from a gas flow

A process is provided for removing contaminants, such as nitrogen oxides, out of exhaust gases, such as gases emitted from an incineration plant. Ammonia or a reducing agent producing ammonia is added to the exhaust gases at a point where the exhaust gases are at a temperature ranging from 700 to 900.degree. C. so that ammonia reacts with and removes nitrogen oxides out of the gases; the gases are passed into a boiler where they are cooled to a temperature ranging from 200 to 350.degree. C. and additional ammonia or reducing agent is injected into the gases; the gases are removed from the boiler and alkaline sorbents, such as alkali metal compounds or alkaline earth metal compounds are injected into the gases, and the gases are passed through a catalyst/filter element coated with a catalytically active oxide or salt of vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, tungsten and molybdenum for catalyzing the reduction of residual nitrogen oxides in the flue gases. The gases discharged from the catalyst/filter element may be subjected to a wet scrubbing step to remove sulfur dioxide and/or hydrochloric acid out of the gases.

Process for removing nitrogen oxides from flue gases

Fly ash from incineration plants is treated with an acidic aqueous solution for the purpose of removing heavy metals. The residual solid matter is filtered. The filtration residue is treated with a precipitating agent for heavy metals. The thereby obtained inert residue can be directly dumped.

Process for the treatment of flue particulates

Solid residues obtained in flue gas purification, in particular flue dusts, are disposed in an environmentally compatible and economical manner by acid extracting heavy metals from the residues, precipitating the heavy metals from the extract, separating the precipitate from the mother liquor, subjecting the precipitate containing heavy metals to mechanical stress during which procedure the water contained in the precipitate is released and the precipitate itself is resuspended, and then adding a hydraulic binder to the resuspended precipitate containing heavy metals and/or to the extracted residues separately from one another. The binder-containing mixture can be used to form moldings which, after hardening, are employed for the erection of boundary walls in a landfill, Additionally or alternatively, the plastic binder-containing mixture can be introduced in the form of layers into preformed landfill spaces, where it then hardens.

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Effretikon, Switzerland

Rudolf Frey