Prevention of defluidization in the treatment of caking carbonaceous solids
US4200495A · kind A · utility
Inventors
Key dates
| Filing date | Sep 18, 1978 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Sep 18, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10J2300/1823
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the introduction of fresh carbonaceous particles into a fluid-bed reaction zone at injection velocities in excess of 20 ft/sec, a shroud gas is passed through a shroud passage on the injection nozzle at a velocity in excess of about 750 ft/sec, preferably at from about 1,000 to about 5,000 ft/sec, in sufficient quantities to supply a substantial portion of the overall energy input into the reaction zone for dispersion of the fresh particles and for breaking up of any agglomerates formed upon injection of the fresh particles into the reaction zone. By accommodating the agglomerating tendencies of the fresh feed material, the high energy shroud gas effectively contributes to the prevention of defluidization of the bed. The shroud gas may be inert or may comprise a gaseous reagent that reacts with the fresh carbonaceous particles in the reaction zone. The energy supplied by the shroud gas desirably is at least about 80% of said energy input to the reaction zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.