Waste heat recovery in asphalt mixing plant
US4375959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1980 |
| Grant date | Mar 8, 1983 |
| Priority date | — |
| Expiry date | Oct 16, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01C19/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In an asphalt mixing plant, a portion of the heat used to vaporize water in the process of drying aggregate is recovered by conducting dryer exhaust gases through parallel ducts which extend serially through the aggregate cold feed bins. These parallel ducts are vertically elongated for optimum heat transfer and to avoid impeding aggregated flow. The ducts have vertically extending external fins for greater contact with the aggregate in the bins. They also have horizontally extending internal fins for improved heat transfer between the exhaust gases and the ducts. The ducts are peaked, and conforming protective caps are provided to prevent damage to the ducts during loading of the bins. Water injection is used to initiate condensation of water vapor in the exhaust gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.