Coal drying process
US4213752A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1978 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Nov 6, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L9/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A single step process for removing moisture from low rank coal using in-situ generated thermal energy by passing the wet low rank coal at room temperature into a moving bed of hot coal at a temperature in the range of from about 200.degree. C. to about 300.degree. C. at a rate to maintain partial combustion of the coal at atmospheric pressure, and in the presence of a gas at atmospheric pressure containing from about 5% to about 20% by volume of oxygen, the heat generated by the combustion being absorbed by the wet coal being fed to the system and being effective for drying the coal to the desired level, and separating the dried coal from the combustion zone, whereby the dry coal obtained is highly resistant to spontaneous combustion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.