Method of stabilizing heavy metals in ash residues from combustion devices by addition of elemental phosphorus
US5284636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Mar 25, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23J7/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the stabilization of heavy metals in the ash produced by the combustion of a heavy metals containing fuel, such as municipal solid waste, by introducing into the combustion system a phosphorous oxide specie or elemental yellow phosphorus. The additive can be introduced at any point in the system upstream of the particulate removal device employed in the system. If elemental phosphorus is used, it must be introduced at a point in the system where it will be exposed to an elevated temperature and oxygen, so as to be converted to a phosphorus oxide specie. When elemental phosphorus is introduced into the system downstream of the combustion zone, it is also effective to reduce the NO content of the flue gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.