Shaft kiln
US4352661A · kind A · utility
4Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1981 |
| Grant date | Oct 5, 1982 |
| Priority date | — |
| Expiry date | Feb 6, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B1/005
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Air heated outside the calcining zone of a shaft kiln is passed through raw material in a hopper mounted above the kiln in order to preheat the raw material. In one embodiment the preheating air is heated by an excess air burner which communicates with the hopper. In another embodiment, the hot calcined material is cooled by forcing cool air through it and the heated air is utilized as preheating air by directing it through a by-pass conduit which connects the cooling zone of the kiln with an extension of the hopper. In neither embodiment does the preheating air constitute combustion supporting air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.