Oil burner for NO.sub.x emission control
US4023921A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Nov 24, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23C7/008
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for producing heat from a liquid fuel in an oil burner with a low NO.sub.x -gas effluent. A small relatively higher velocity stream of air is directed concentric about a divergent spray or stream of ignited fuel oil in a primary flame zone in such amount that only a minor portion of the fuel can be combusted in said primary flame zone. The air is directed in such manner as to produce toroidal fluid circulation pattern atomizing the liquid fuel and establishing a stable flame. A small amount of recirculated flue gas (RFG) is immediately thereafter introduced concentrically about said primary flame zone in the general direction of fluid flow. Air is introduced concentrically thereabout in a secondary flame zone in the fluid flow path of said primary flame zone in at least sufficient quantity to burn the remaining combustibles. Oxides of nitrogen in the resultant effluent are suppressed by adjusting the amount of RFG and hence the flame composition and temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.