Method of sealing a fluidized bed and device for carrying out the method
US4399618A · kind A · utility
Inventor
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/53
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and a device, FIG. 1, for sealing an opening (15, 8, 10) between two zones in a fluidized bed and/or between the bed and its surrounding (22). In the bed particles (2) are intended to be maintained suspended by means of a carrier gas, which is introduced in the bottom (3) of the bed below the level of aid opening (15, 8, 10). Through said opening (15, 8, 10) primarily workpieces (66) intended to be treated in the bed are intended to pass, which opening (15, 8, 10) is, for example, a horizontal gap in a vertical partition wall (11, 9) between the zones (12, 13, 14) or between the bed and its surrounding (22). The method according to the invention is characterized in that a heap (19, 27) or several heaps (19, 27) of particles (2), by utilizing the movements of the particles (2) and carrier gas in the bed, are caused to be built up at said opening (15, 8, 10) to such a height that the opening (15, 8, 10) is covered or substantially covered by the heap/heaps (19, 27) of particles (2). Workpieces (6) during their passage through the opening (15, 8, 10), and therewith through the sealing, demolish the heap/heaps (19, 27), whereafter said heap/heaps (19,27) are built up again dur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.