Low NOX burner

a burner and low-nox technology, applied in the field of low-nox burners, can solve problems such as internal fouling/coking, and achieve the effect of increasing the tip length

Inactive Publication Date: 2012-02-16
TOTAL RES & TECH FELUY
View PDF21 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a burner tip for a furnace used for combusting fuel gas. The burner tip has a plurality of primary ports for delivering the primary fuel gas in the combustion zone and a bluff body attached to the tip for producing a low air speed in the vicinity of the primary ports to allow sufficient time for ignition. The burner tip also has secondary ports for delivering the secondary fuel gas in the flue gas zone to create a fuel-rich zone and reduce NOx formation chemistry. The flame stabilization is ensured by the bluff body. The purpose of the secondary ports is to stage the combustion zone into fuel-lean and fuel-rich zones.

Problems solved by technology

A problem of these fuel tips is overheating and internal fouling / coking caused by thermal cracking of the fuel.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low NOX burner
  • Low NOX burner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035]Fuel gas means any gas capable to burn but advantageously comprises essentially methane or mixtures of methane with hydrogen (e.g. 5 to 30 vol % in methane), or mixtures of methane with hydrogen and / or purge gas recovered in a steam cracking plant. The purge gas comprises hydrocarbons having up to 5 carbon atoms.

[0036]As regards the burner tube it would not depart from the scope of the invention to have a burner type having a non circular cross section area. The burner type can be horizontal or vertical. The secondary fuel ports can be circular or slotted. Circular ports are preferred as they entrain more flue gas.

[0037]As regards the bluff body it can be any shape which produce, in the vicinity of the ports which deliver the primary fuel gas, an air speed as low as possible, advantageously lower than the flame speed, such as the said primary fuel gas is given sufficient residence time to ignite. The bluff body can be a plurality of fins or a cone having a symetrical axis esse...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Disclosed is a burner tip to be used in a furnace for the combustion of fuel gas in the combustion zone of a furnace, that comprises a burner tube that has a longitudinal axis and has a dowstream end and an upstream end for receiving the fuel gas.

Description

FIELD OF THE INVENTION [0001]The present invention relates to a low NOx burner. Nitrogen oxides NO and NO2 are produced in three different ways in furnaces and boilers:[0002]fuel NOx: based on the nitrogen that is present in liquid and solid fuels[0003]prompt NOx: produced early in the flame, but in small quantities[0004]thermal NOx: produced at very high temperatures[0005]Thermal NOx is the dominant mode for furnaces that use gaseous fuels, for example steam cracking furnaces that use mixtures of methane with 5-30 vol % hydrogen. So in order to achieve low emissions of nitrogen oxides (NOx) with a gaseous fuel it is necessary to reduce the peak flame temperature in order to reduce the thermal NOx production. Research has shown that the highest formation of thermal NOx occurs around the stoichiometric ratio, which means that ratio where the oxygen requirements for complete combustion are precisely fulfilled. The NOx formation is significantly less in case the amount of oxygen is muc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(United States)
IPC IPC(8): F24C3/00
CPCF23C2201/20F23D14/10F23D14/48F23D14/70
InventorPLATVOET, ERWIN
OwnerTOTAL RES & TECH FELUY