Subterranean gasification of bituminous coal
US4313499A · kind A · utility
4Cited by
10References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1980 |
| Grant date | Feb 2, 1982 |
| Priority date | — |
| Expiry date | Jul 21, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S48/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In the underground gasification of a swelling coal the high gas-flow link between the injection and the production wells needed for the gasification process is produced by reverse combustion using air heated to a temperature below the softening point of the coal. The heated air pretreats and conditions the coal proximate to the link under formation by increasing its permeability and reducing its swelling properties. Improved combustion and suppression of plugging results in the subsequent gasification stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.