Dryer drum coater having recirculation chamber for VOC/NOX reduction
US5522158A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1994 |
| Grant date | Jun 4, 1996 |
| Priority date | — |
| Expiry date | Mar 7, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01C2019/109
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dryer drum coater has an internal recirculation cylinder for promoting the recirculation of combustion products so as to entrain and incinerate blue smoke formed when heated and dried virgin aggregate is mixed with other asphaltic products such as RAP and/or liquid asphalt in the dryer drum coater. The recirculation cylinder acts to extend and strengthen natural eddy currents formed during operation of the coater such that combustion product recirculation which would normally extend only in the end area of the flame extends far enough toward the base of the flame to entrain the blue smoke and to draw the blue smoke into the base area of the flame. The cylinder may comprise a refractory lined stainless steel shell or may be formed from tee flights of the type used in the combustion zones of dryer drum coaters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.