Reduction of nitrogen- and carbon-based pollutants through the use of urea solutions
US4992249A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1987 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Aug 27, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a process for reducing nitrogen oxides in an effluent from the combustion of a carbonaceous fuel under oxygen-rich conditions which minimize the production of carbon-based pollutants. A dispersion of a dilute aqueous urea solution is injected into an effluent at a temperature above 2000.degree. F., and preferably above 2100.degree. F. The concentration of the urea in solution and the size of the droplets in the dispersion are selected to provide the reduction in nitrogen oxides. The solution will preferably contain at least 80% by weight solvent and contain droplets sized within the range of from 150 to 10,000 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.