EP0452608A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved burner for thermic generators
Assignee: Ansaldo Caldaie Spa enel SpA
•
Filing: 1990-12-24
•
Granted: —
•
Expires: 2010-12-24
Abstract
Abstract A burner (4) with low NOx production, wherein the combustion air is subdivided in three streams with swirlers in each air stream. The stream of primary air is intercepted by a swirler comprising an array of radially fixed vanes (15) mounted in the corresponding outlet section of primary air duct (10) in the combustion chamber (3), while the secondary and tertiary air swirlers comprise vanes (18, 19) turnable around axes disposed perpendicular and parallel to the central axis of the burner, respectively. The primary and secondary air ducts (10,11) have a continuously adjustable inlet section. Furthermore, there are provided flow rate meters (24, 25) near the outlet section of the secondary and tertiary air ducts (11,12) substantially unaffected by the vorticity induced by said swirlers.
Inventors
- 👤 Giuseppe Ancona
- 👤 Giancarlo Benelli
- 👤 Gennaro De Michele
- 👤 Sergio Ligasacchi
- 👤 Gianni Mascalzi
- 👤 Giancarlo Scavizzi
- 👤 Giuliano Trebbi
- 👤 Aldo Zennaro
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 11:46
CPC Classifications
F; F23; F23C; F23C7/00; F23C7/002; F23C7/004; F23C7/008; F23C9/00; F23D; F23D17/00; F23D17/002
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
Improved burner for fuel oil and fuel gas with low NOx production, in which the combustion air is subdivided in three streams, i.e., primary, secondary and tertiary streams, and fed to a combustion chamber (3) coaxially to the fuel feeding, and a swirler for the vorticity control of the air to be fed to said chamber is installed in every of said air streams, characterized in that the swirler of the primary air comprises an array of radially fixed tabs (15) in correspondence to the outlet section of said primary air stream in said combustion chamber (3), the swirler of the secondary and the tertiary air comprising tabs (18, 19) turnable around axes disposed perpendicurar and parallel to the longitudinal axis respectively, the primary and secondary air inlets (13, 16) having a continuously variable and adjustable section, mass rate meters (24, 25) being furthermore provided near the outlet sections of said secondary and tertiary streams in said combustion chamber substantially unaffected by the vorticity induced by said swirlers.
Claim 2
Dependent Claim
39 words
Improved burner according to claim 1, wherein flow separating means (26, 27) are provided among said streams of primary, secondary and tertiary air, downstream of their outlet section to said combustion chamber, for deviating said streams in divergent directions.
Claim 3
Dependent Claim
55 words
Improved burner according to the previous claims, wherein said flow separating means comprise essentially a couple of coaxial baffles (26, 27) with truncated cone shape and with different inclination arranged between said primary and secondary streams and, respectively, between said secondary and tertiary streams, said baffles fixedly extending from the outlet section of said streams.
Claim 4
Dependent Claim
43 words
Improved burner according to the claim 3, wherein a throat (28) is delimited between said separating baffle (27) installed between the stream of secondary and tertiary air and a truncated cone divergent wall (2a) of the inlet section of said combustion chamber (3).
Claim 5
Dependent Claim
34 words
Improved burner according to the claim 1, wherein said mass rate meters (24, 25) for the streams of secondary and tertiary air each comprise a couple of annular pitots coaxial to the longitudinal axis.
Claim 6
Dependent Claim
36 words
Improved burner according to the previous claims, wherein the stream of primary and secondary air is fed to respective primary (10) and secondary (11) ducts through inlets (13, 16) interceptable by movable air locks (14, 17).
Claim 7
Dependent Claim
17 words
Improved burner according to the previous claims, wherein said swirler of the primary air is axially sliding.
Claim 8
Dependent Claim
19 words
Improved burner according to the previous claims further comprising an additional duct (29) for the injection of recycled smokes.
Claim 9
Dependent Claim
24 words
Improved burner according to the claim 8 wherein said additional duct (29) of recycled smokes flows in the duct (10) of primary air stream.
Claim 10
Dependent Claim
33 words
Improved burner according to the claim 8, wherein said additional duct (29) of recycled smokes is coaxial to said duct (10) of primary air stream and flows directly into the combustion chamber (3).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.