Upgrading solid fuels
US4701184A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 7, 1986 |
| Grant date | Oct 20, 1987 |
| Priority date | — |
| Expiry date | Feb 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10F7/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Process for treatment of brown coal which comprises subjecting the said coal to shearing forces to produce a plastic mass which is capable of conversion by subsequent compaction and drying into a fuel of increased density and enhanced calorific value, is characterized in that the water content of the coal is more than 54% and the shearing forces are applied for less than one hour, shorter times being preferred, for example less than 30 seconds. A preferred embodiment provides a continuous process in which the coal is treated in a machine that subjects it to sequential steps of shearing and extrusion in a continuous manner. The extruded product after drying provides the fuel of increased density and enhanced calorific value. The desired effect may also be obtained by treating part of a quantity of brown coal and blending the treated portion with the untreated remainder of the said quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.