Method for drying waste materials
US5285581A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1991 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Oct 30, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B11/0477
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A dryer assembly dries waste materials to a predetermined moisture level. The dryer includes a drum having an inlet where waste materials and hot gasses are simultaneously introduced, and an outlet where dried materials and hot vapors are transferred out of the dryer. The drum presents a plurality of preheat baffles in which the material is heated by but does not contact the gasses, thereby avoiding premature combustion of the material. Baffle sections located downstream of preheat baffles uniformly distribute material downstream into a primary drying section of the drum, where the material is mixed with the gasses to uniformly dry the material to the predetermined moisture level. The primary drying section includes alternating baffle sections which dry the material and which recycle material that is not yet dried back into the preceding baffle sections, respectively. The dryer can be readily adapted to accommodate a wide variety of materials of widely varying moisture levels by modifying the dwell times of the material within individual dryer sections and/or by varying the diameter of the dryer and the lengths of the individual dryer sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.