Method for drying bulk material

摘要

The invention relates to a method for drying bulk goods, in particular solids, such as granular materials, powders, grains, films, shreds, or the like, preferably plastic granular material, in a drying silo (9) by means of an air flow. The exhaust air flow (5) that is discharged from the drying silo (9) is dried in a wheel dryer (1). The adsorbent is regenerated and cooled in the wheel dryer. A rotatable drum (2) of the wheel dryer (1) is divided into at least three wheel segments, wherein the region of a wheel segment is used for drying or dehumidifying the exhaust air flow, the region of the second wheel segment is used for heating the adsorbent, and the region of the third wheel segment is used for cooling the adsorbent. The drying or dehumidifying phase (14) for the exhaust air flow (5) and preferably the adsorbent cooling occur in parallel, in particular in a continuous manner during the operation. The regenerating phase (15) with the adsorbent heating is carried out at intervals during the operation. The drum (2) of the wheel dryer is stopped in the cooling (16) or regenerating phase (15) and advanced to a selectable region, preferably the cooling region, after the cooling (16) or regenerating phase (15) finishes.

主权项

1. A method for drying bulk goods in a drying silo with an air flow, the method comprising:
drying in a wheel dryer having a drying or adsorbing agent at least one of exhaust air flow discharged from the drying silo or returning air flow from the wheel dryer in a dehumidification phase; reintroducing the dried at least one of exhaust air flow or returning air flow to the bulk goods as drying air flow; regenerating the drying or adsorbing agent in the wheel dryer in a regeneration phase; and cooling the drying or adsorbing agent in the wheel dryer in a cooling phase, wherein the wheel dryer comprises a region for one of drying or dehumidifying the exhaust air flow for the dehumidification phase, a region for heating the drying or adsorbing agent for the regeneration phase, and a region for cooling the drying or adsorbing agent for the cooling phase, and the wheel dryer includes a rotatable drum divided into a plurality of cells that are selectively positionable in one of: the region for one of drying or dehumidifying the exhaust air flow for the dehumidification phase, the region for heating the drying or adsorbing agent for the regeneration phase, and the region for cooling the drying or adsorbing agent for the cooling phase, wherein the region for heating is at least as large as the region for cooling, and wherein the dehumidification phase and the cooling phase occur in parallel in a continuous manner during operation, and the regeneration phase occurs in an intermittent manner during operation, such that the regeneration phase is not in operation for a group of cells that have already been subjected to the regeneration phase but still remain in the region for heating.