Rotary drum dryer having internal flights
US5203693A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Oct 1, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B11/0477
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A rotary drum dryer is disclosed which is useful in the production of asphalt paving composition. The drum incorporates a burner which defines a combustion zone, and a novel dam and flight construction is mounted to the interior of the drum so that the flights surround the combustion zone. The dam is adapted to retain and raise the level of the aggregate flowing through the rotating drum so that the flights pass through the aggregate in the bottom of the drum, and the flights collect a portion of the aggregate on their top surfaces and carry the collected aggregate to an elevated discharge point, where the aggregate drops back to the bottom of the drum. The flights serve to shield the metal wall of the drum from the radiant heat energy of the burner flame which would otherwise result in its rapid deterioration, and they also serve to permit the aggregate to be effectively exposed to the radiant heat. The fact that more radiant heat energy is transferred to the aggregate, serves to further lower the temperature of the metal wall of the drum. Still further, the fact that the flights pass through the aggregate and are covered by the aggregate through a substantial portion of their cir…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.