Method and system for the thermal treatment of dispersible raw material
A method for the thermal treatment of dispersible raw material may involve introducing raw material into a riser tube that is perfused by hot gases and thermally treating the raw material with the hot gases. Furthermore, the method may involve feeding a fuel to the riser tube. The fuel may initially dwell in a fuel-conditioning region on a bearing face, where the fuel comes into contact with a part of the hot gas that is mixed with the raw material. Consequently, the fuel is dried and/or at least partially de-gassed and/or at least partially reacted and subsequently transferred into the riser tube.
1. A method for thermal treatment of dispersible raw material, the method comprising:
introducing raw material into a riser tube that is perfused by hot gases;
thermally treating the raw material in the riser tube with the hot gases;
feeding a fuel into a fuel-conditioning region and onto a bearing face disposed in a conditioning chamber that leads into the riser tube, wherein at least 50% of hot gases that come into contact with the fuel is formed by a part of the hot gases that are mixed with the raw material and deflected into the conditioning chamber, whereby as a result the fuel is at least one of
dried,
partially or completely de-gassed, or
partially or completely reacted; and
transferring the fuel into the riser tube.
2. The method of claim 1 wherein the fuel is fed onto the bearing face mechanically or by gravity.
3. The method of claim 1 further comprising conveying the dried, partially or completely de-gassed, or partially or completely reacted fuel mechanically or pneumatically along the bearing face before being transferred into the riser tube.
4. The method of claim 1 further comprising setting in a targeted manner an amount of the hot gases that is mixed with the raw material and comes into contact with the fuel in the fuel-conditioning region by adding an oxygen-containing gas.
5. The method of claim 1 further comprising decelerating or completely stopping a combustion reaction of the fuel on the bearing face by using an inert material.