Method of igniting in situ oil shale retort with fuel rich flue gas
US4005752A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Oct 16, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/243
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A technique is provided for igniting one in situ oil shale retort with flue gas from an earlier retort. Towards the end of oil shale retorting the flue gas from an in situ retort has a substantial fuel value so that it can be burned for generating heat. This fuel gas is conveyed to the entrance to a second retort and burned to initiate retorting. Even after retorting of the bed of particles in the first retort is completed, a fuel rich flue gas can be obtained and used for ignition of a subsequent retort. In either case the prior retort has a large bed of hot spent oil shale particles through which air is passed to burn carbonaceous material therein. Hot flue gas from the earlier retort can also be used for preheating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.