Method and burner for reducing nitrogen oxide emissions during the combustion of a gaseous fuel
US10352556B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 2014 |
| Grant date | Jul 16, 2019 |
| Priority date | — |
| Expiry date | Oct 2, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23D2203/1012
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method for reducing nitrogen oxide NOx emissions during combustion of a gaseous fuel in a burner intended for a naked-flame or controlled-atmosphere reheating furnace, for reheating steel products or for continuous coating and/or annealing of metal strips, wherein a first dilution is carried out by mixing combustion air with combustion products upstream from or in the body of the burner, and a second dilution is carried out directly at the level at which the gaseous fuel reacts with the combustion air, mixing the fuel with a recirculated portion of the flame or products of partial combustion, the double dilution enabling the physical and chemical properties of the gas to be modified in order for the burner to operate with low oxygen rates and obtain a flame that produces a very low level of NOx production regardless of the temperature of the enclosure in which the combustion takes place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.