Method of and apparatus for sensing the ash content of coal
US4486894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Jan 15, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/617
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The ash content of a granular coal sample having a moisture content greater than 10% by weight is sensed by bombarding it with primary radiation comprising at least two spectrums of energies (46 KeV and 9-17 KeV) to cause radiative reactions in the coal, sensing the secondary radiation generated by the radiative reactions caused by one of the two spectrums of energies (46 KeV), sensing the secondary radiations at a characteristic fluorescent energy of at least one element (e.g. iron) in the coal sample, the characteristic fluorescent energy being excited by the other of the two spectrums of energies (9-17 KeV), and using the sensed secondary radiations to determine the ash content of the coal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.