Disperser seal and method
US4270762A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1978 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Jul 25, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/927
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A seal for a shaft of a disperser crusher, that pulverizes hot coal particles, maintains a higher than atmospheric pressure within a casing for the crusher, and is able to withstand elevated temperatures that are produced within the casing. The pressure and temperature result from hot gases that convey coal particles to the crusher. The seal includes self lubricating graphite packings that are urged in abutting relation with a smooth, ceramic sleeve on the shaft and are able to withstand the temperature on the shaft surface. A first, interior packing is on the inside of a wall of the casing while a second, exterior packing is outside of the wall. Superheated steam, a gas inert with the coal particles, is supplied to the interior packing with sufficient pressure to substantially prevent the migration of coal particles through the interior packing. The tendency of the coal particles to migrate from the container through the interior packing is further inhibited by providing a tortuous path from the casing to the interior packing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.