| 摘要 |
<p>The invention relates to a method for the drying and combustion of water-containing material containing combustible components, such as dehydrated waste water sludge, and wherein a water-containing material is introduced into a direct dryer, drying of the material introduced into the dryer by introduction of atmospheric air as drying air into the dryer, introduction of the dried material into a furnace and combustion of the material therein, introduction into the furnace of at least a portion of the drying air after the dryer as combustion air, preheating of the drying air intended for the drying of the material by utilization of the heat contained in the hot flue gas discharged from the furnace, while water is supplied to the atmospheric air in connection with the preheating whereby the water is evaporated, and wherein the water content in the drying air is reduced after the dryer in a condenser prior to its introduction as combustion air into the furnace. Moreover, the invention relates to a plant for carrying out this method. In such method it is possible to dry e.g. waste water sludge with a high water content to a degree of dryness that allows burning without auxiliary fuelling. Hereby improved operational economy is obtained.</p> |
