Combustion process and gas burner with low nox, co emissions
AssigneeWorgas Bruciatori S.r.l.
InventorEnrico Sebastiani
Life of this patent
Estimating the term…
Abstract
The process obtains a plurality of small flames which become violet when combusting natural gas. In particular the amount of primary air induced is at least 80% of the air stoichiometrically required for combustion; the secondary air laps all sides of each singly small flame arising from the small group of slots on the burner body, in the area where each flame leaves the surface of the burner body so as to swell it making its width at least as big as its height and/or alternatively the contact surface between each flame and the secondary air is increased right from the first steps in combustion, so that each small group creates a small flame with two divergent bladed wings, similar to "butterfly wings."
Claims15
A process to obtain the combustion of a gas while generating products of combustion having a very low content of harmful emissions (NO.sub.x, CO), by combustion in an atmospheric burner having a diffuser portion, the process comprising the steps of:
- providing a quantity of combustible gas and sucking therewith into the atmospheric burner a quantity of ambient air to form an air-gas mixture which comprises at least 80% of the air stoichiometrically required for the combustion;
- burning the air-fuel mixture while providing secondary air, which from the beginning of the combustion laps all sides of each of a plurality of single bladed small flanges (F) exiting from each of a plurality of groups of slots on said diffuser portion of the burner, in such a way that the total amount of air thus involved in the combustion exceeds a stoichiometrical air value;
- and
- completing combustion of the gas within the thickness of the flames corresponding to the groups of slots so as to cause the emission of violet light therefrom of a wavelength less than 0.42 micron.
A burner, for burning a gas so as to generate products of combustion that are low in harmful constituents, comprising:
- a suction tube comprising a Venturi tube portion;
- and
- a slotted and pierced diffuser having a plurality of small groups of slots and flame lift preventing holes located in rows perpendicular to a longitudinal axis of the burner, a distance between said small groups in each row being at least 0.65b, where "b" is the length of the longest slot of the slots in each small group a distance between adjacent rows being at least nd/2 where "d" is the width in an axial direction of the slots forming each small group and "n" is selected to be one of the number of small groups in a row and the number of small groups in two adjacent rows in an arrangement of rows where the rows are offset,
- the specific combustion capacity of the burner not exceeding 1.1 KW per each cm.sup.2 of port area on the diffuser.
Dependencies are inferred from the claim text.