Asea Brown Boveri Ag

Alstom (Switzerland) Ltd

Holcim Technology Ltd

Beat Stoffel

Hans Ruegg

Christian Steiner

Christian Wieckert

Hans R&uuml;egg

Bruno Carcer

Armando Cruz

Laurent Seyler

Mirko Weber

Rudy Blum

Guillermo Brusco

Michael Weihrauch

Maxime Butler

Jorge Guillermo Zesati

Karl-Heinz Boes

Armando Alberto Arellano

Ernst Bucher

Francisco Salas Vallejo

In a process for utilizing organic waste materials, in particular cellulose-containing, moist, organic waste materials, in a clinker production process in which the waste materials are introduced as fuel and burnt in the clinker production process, the waste materials are brought into contact with the hot exhaust gases of the clinker production process and dried in a drying step flowing in parallel therewith before they are introduced into the clinker production process. The drying step is carried out in a drying reactor in which the moist waste materials are passed together with the hot exhaust gases through a series of concentrically arranged tubes, with multiple changes in flow direction about 180&#xb0;, and the temperature of the hot exhaust gases is set to a maximum value of 400&#xb0; C. by mixing in of ambient air and/or air from the clinker production process before the drying step.

Process for utilizing organic waste materials

In a process for melting inorganic materials ( ) in a rotary horizontal converter or a rotary kiln ( ) by adding fuel ( ), oxygen or oxygen-enriched gases ( ) and the inorganic materials ( ) to a liquid bath ( ), solid fuel ( ) is added in piece form. The oxygen or the oxygen-enriched gas ( ) is blown at high velocity (v) onto the surface of the bath ( ), reacts with the solid fuel ( ) and releases heat in the course of this. By means of the process of the invention, high temperatures can be achieved with the use of inexpensive fuels.

Process for melting ashes, slags or glass

In a process for the thermal treatment of solid materials ( ), in particular refuse, in which the solid materials ( ) are burnt/gasified or pyrolized in a first step ( ) with a lack of oxygen, and then, in an afterburning zone ( ), the flue gases ( ) from the first step ( ) are mixed with an oxygen-containing gaseous medium ( ) and are burnt with complete burn-off, the flue gases ( ) emerging from the first step ( ) are firstly actively homogenized in a mixing zone ( ) with the addition of a gaseous oxygen-free or low-oxygen medium ( ) before they are mixed with the oxygen-containing medium ( ). Then, the homogenized flue-gas stream flows through a holding zone ( ), in which it stays for at least 0.5 second, before, in an afterburning zone ( ), the medium ( ) which serves to ensure complete burn-off of the flue gas is added. The process according to the invention is distinguished by simple process steps and by a reduced level of pollutant emissions, in particular NOx, compared to the prior art.

Method for the heat treatment of solids

In a process for reprocessing slag and/or ash from the thermal treatment of refuse, the refuse (1) is pyrolyzed, gasified or partially combusted in a first process step, heavy-metal-containing slag and/or ash (8) having a comparatively high carbon content being formed. Said slag and/or ash (8) is then heated in a rotary kiln (6) to a temperature below the melting temperature of the slag and/or ash (8) in a second process step, the slag and/or ash (8), prior to its discharge from the rotary kiln (6), dwelling sufficiently long in the rotary kiln (6), that the heavy metals present therein are converted into their metallic form by reduction at the carbon endogenous to the slag and the readily volatile heavy metals are transferred to the gas phase and are discharged from the rotary kiln (6) together with the flue gas (9), and finally a slag (15) depleted in heavy metals being discharged from the rotary kiln (6).

Process for reprocessing slag and/or ash from the thermal treatment of

Growing community of inventors

Zumikon, Switzerland

Beat Stoffel