Indirectly fired vertical shaft furnace
US4128231A · kind A · utility
Inventor
Key dates
| Filing date | Mar 9, 1978 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | Mar 9, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B1/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An indirectly fired vertical shaft furnace suitable for use as a volatilizing furnace for recovering metals from their ores, a crop drying or roasting furnace or a heating furnace is comprised of two concentric cylindrical metal shells each of which is closed at the upper end. The outer shell is completely lined with a lightweight insulating material and the lower end of the shell is connected to the upper end of an annular fire chamber having an upwardly open U-shaped cross-section cast from firebrick material. Two tangentially directed burners extend into the chamber to produce a swirling action of the hot gases in the heating chamber between the two cylindrical members. Conduits are provided through the top walls of both cylindrical member for withdrawing the material from the bottom of the central chamber. A vapor collector is coaxially located within the central chamber and has spirally arranged apertures for collecting vapors under transverse channels extending radially outwardly from the conduit across the central chamber above each of the apertures. Additional conduits are provided at the bottom of the central chamber for introducing air into the central chamber and collect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.