Burner and boiler-burner assembly

Abstract

A burner (1) installable to a furnace (9) for burning an air-fuel mixture and for generating a flame in the furnace (9), said burner (1) comprising a frame member (6) provided with an elongated combustion head (2) protruding from said frame member (6) and being adaptable inside the furnace (9), what in a view from the burner's (1) frame member (6) is a distal end (2a) of said combustion head (2) being adaptable to generate both a main flame (B) and a primary flame (E), said combustion head (2) comprising an outer, larger diameter channel (3) for a mixture (80) of combustion air and fuel, as well as a smaller diameter, inner channel (4), surrounded by said outer channel (3), for primary air (60) as well as for primary gas (70), whereby the inner channel (4) extends from the burner's frame member (6) to the distal end (2a) and comprises an inner tube (4, 41) for primary gas (70) and an outer tube (4; 42) surrounding said inner tube (4; 41), wherein a flow space (4; 43) for primary air (60) is provided between the outer side of the jacket (41a) of said inner tube and the inner side of the jacket of the outer tube, and which combustion head's (2) outer channel (3) extends from the burner's frame member (6) to the combustion head's distal end (2a) and can be provided with a supply of premixed air-fuel mixture (80) from the burner's frame member (6), or from that section of the combustion head (2) which is associated with the frame member and located, in the flowing direction of the premixed air-fuel mixture (80), upstream of a combustion chamber (90), for generating the main flame B). In said burner the space delimited by the outer wall (31) of the outer channel (3) and the jacket of the outer tube (42) of the inner channel (4) is constructed as a discharge channel (10) extending from the frame member (6) to the distal end (2a) of the combustion head (2), whereby the discharge end (10a) of said discharge channel is veered away from the longitudinal center line (P) of the combustion head (2) so that the center line (10A) of said discharge end (10a), or an extension thereof, forms an inclined angle of incidence (t) with the combustion head's (2) longitudinal center line (P), said angle of incidence (t) being 90-140 degrees as said discharge end (10a) of the discharge channel (10) is viewed from the direction of the burner's (1) frame member (6), a flow controller (7) is provided in the flow space (4; 43) for primary air, at the distal end (2a) of the combustion head (2), for directing the flow of primary air (60) in the flow space (43) so that the primary air (60) flows from the flow controller (7) towards the mouth (43a) of the flow space (43), in the vicinity of the jacket (42a) of the outer tube (4; 42) of the inner channel (4), a plurality of nozzles (8) is provided in the inner tube (4; 41) of the inner channel (4), at the distal end (41a) of said inner tube (4) in the flowing direction of the primary gas (70), for directing the primary gas (70) into the flow space (4; 43), either upstream or downstream of the flow controller (7) in the flowing direction of the primary air (60).

Dependencies are inferred from the claim text.