# US 6,336,415 B1 · Method for the heat treatment of solids

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- Number: US 6,336,415 B1
- Document ID: US6336415B1
- Status: Granted
- Kind: B1
- Application number: 09/700,163
- Filed: 2001-01-22
- Granted: 2002-01-08
- Earliest claimed: 2001-01-22
- Web page: https://patentgrep.com/patent/US6336415B1

## CPC

- F23G 5/30: having a fluidised bed
- F23G 5/165: {arranged at a different level}
- F23L 7/00: Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L 7/005: {Evaporated water; Steam}
- F23G 2202/101: with controlled oxidant supply
- F23G 2203/10: Stoker grate furnace
- F23L 2900/07002: Injecting inert gas, other than steam or evaporated water, into the combustion chambers
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23L: SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ({air-supply arrangements for fluent fuels F23C;} firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04); VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS {(dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24)}; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES

## Abstract

In a process for the thermal treatment of solid materials (3), in particular refuse, in which the solid materials (3) are burnt/gasified or pyrolized in a first step (5) with a lack of oxygen, and then, in an afterburning zone (14), the flue gases (6) from the first step (5) are mixed with an oxygen-containing gaseous medium (15) and are burnt with complete burn-off, the flue gases (6) emerging from the first step (5) are firstly actively homogenized in a mixing zone (7) with the addition of a gaseous oxygen-free or low-oxygen medium (8) before they are mixed with the oxygen-containing medium (15). Then, the homogenized flue-gas stream flows through a holding zone (13), in which it stays for at least 0.5 second, before, in an afterburning zone (14), the medium (15) 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.