Dense phase coal feeding system
US4668130A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1982 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Apr 5, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21B5/003
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Carbonaceous solids such as coal and oil shale are fed to a high temperature processing vessel without bridging and plugging problems interrupting the flow of the solids into the processing vessel by passing the solids at a controlled rate from a feed vessel into a first conduit communicating with the feed vessel. The solids are then passed through the first conduit into a second conduit which communicates with the first conduit and the processing vessel, and which contains a scraper for scraping the inside walls of the conduit. The pressure in the feed vessel is maintained at a level higher than that in the processing vessel by passing a sufficient amount of a gas into the feed vessel such that the solids are passed through the second conduit into the processing vessel in dense phase pneumatic flow as the scraper scrapes the inside walls of the second conduit thereby preventing any bridging or plugging from occurring. Normally, the scraper will consist of a wire helix which is rotated inside the second conduit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.