Coal gasification ash removal system
US3957459A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1974 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Apr 4, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S48/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In a fluidized bed process for the gasification of coal or similar carbonaceous solids wherein char particles are withdrawn from a fluidized bed reaction vessel, transported to a second vessel, and later returned to the initial vessel, char particles of high ash content are separated from particles to be returned to the fluidized bed reaction vessel by injecting a dense phase stream of char particles including particles of both high and low ash content into a vertically moving gas stream having a velocity sufficient to transport relatively light particles of low ash content upwardly into the fluidized bed reaction vessel but insufficient to suspend relatively dense particles of high ash content, collecting the high ash content particles which are not entrained by the gas stream, and periodically withdrawing the collected particles from the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.