Method for decreasing emissions of nitrogen oxides and sulfur oxides when burning fuels which contain nitrogen and sulfur
US4824360A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | May 14, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23C2206/101
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method for decreasing emissions of nitrogen oxides and sulfur oxides when burning fuel which contains nitrogen and sulfur. According to the invention this is carried out by feeding fuel (4) and oxygen-containing gas (5) into a combustion reactor (1) the temperature of which is preferably 900.degree.-1500.degree. C., and that the combustion gases formed are directed into a suspension reactor (2) the temperature of which is preferably 750-1050.degree. C. and into which a pulverous material which binds sulfur oxides is fed so that the suspension density is 1-200 kg/m.sup.3, the oxygen concentration in the combustion reactor (1) and the suspension reactor (2) being controlled so that their total air coefficient is about 0.65-2, whereafter the gases are directed into an after-treatment reactor (3), into which oxygen-containing gas (12) is fed in order to adjust the oxygen concentration in the flue gases so that the residual oxygen concentration in the flue gases (13) emerging from the after-treatment reactor is 0.5-16, preferably 1-6% by volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.