摘要:
In a burner for operating a combustor, the former consists essentially of a rotation generator (100), a transition piece following the rotation generator, and a mixing pipe following this transition piece. Transition piece and mixing pipe form the mixing section (220) of the burner and are located upstream from a combustion chamber (30). In the lower part of the mixing pipe is located a pilot burner system (300) which creates, among other things, a stabilization of the flame front, in particular in the transient load ranges, while minimizing pollutant emissions. A sensor (400) installed in the burner detects a flashback of the flame (80), whereupon the fuel quantity of this flame is at least temporarily reduced and at the same time the fuel quantity for the pilot burner is increased in such a way that the total fuel quantity and thus the turbine output remains constant. This measure prevents a destruction of the burner.
摘要:
The invention relates to a premix burner with high flame stability for use in a heat generator, preferably in the combustion chamber of a gas turbine. Modern, lean-operated premix burners enable very low noxious emissions, but sometimes operate very close to the extinction limit. To increase the stability of the lean premix combustion by increasing the distance between flame temperature and extinction limit temperature the invention proposes to equip the burner in the mixing zone (200) with a net-like structure (201) for the premixing of combustion air and fuel. According to a preferred embodiment, the net-like structure (201) consists of a plurality of layers of individual wire mesh fabrics (202) arranged at a distance from each other. The wire mesh fabrics (202) are preferably equipped with an oxidation-promoting, catalytically active surface. It was found that the net structure (201) positively influences the thermoacoustic behavior of the burner and dampens and insulates pressure waves from the combustion chamber (300), and in this way reduces the excitation of pressure waves in the combustion chamber (300).
摘要:
Described is a premix burner arrangement as well as a method for operating the same, comprising a pilot fuel feeding means for operating a combustion chamber of a gas turbine arrangement, a premix burner, wherein at least one fuel addition unit as well as supply air openings have been provided in such a way that gaseous and/or liquid fuel can be mixed with combustion supply air inside the premix burner and form a fuel/air mixture, which exits from the premix burner downstream in the direction towards the combustion chamber positioned after the premix burner arrangement and which can be ignited inside the combustion chamber in the form of a spatially largely stationary flame. The invention is characterized in that outside of the premix burner, a catalyzer unit is provided, through which the pilot fuel feeding is performed in such a way that a pilot fuel/air mixture flows through the catalyzer unit and can be converted in it at least in part catalytically, and flows as a mass flow that stabilizes the flame into the combustion chamber.
摘要:
A premixing burner has a swirl generator with at least two burner shells (1) which jointly enclose an axia conically widening swirl space and delimit tangential air inlet slits (3) through which combustion supply air passes into the swirl space in which an axially propagating swirl flow is formed, and with fuel injection devices at least partially along the tangentially running air inlet slits (3). The fuel injection devices include a fuel line (6) separate from the burner shell (1) and which is firmly attached to the burner shell (1) so as to be longitudinally movable with respect to the burner shell (1) and releasable perpendicularly to the surface of the burner shell (1). In the burner shell (1), orifices (4) are provided, into which issue fuel injectors (7) which are provided along the fuel line (6) and which project beyond the circumferential edge of the fuel line (6).
摘要:
A lance (3) for introducing a fuel into a mixing path (2) of a burner (1) which is provided with a swirler for producing a swirled combustion air flow, especially a burner of a turbine plant, includes a lance head (5), a fuel feed (8) and an oxidator feed (10). The lance head (5) projects into the mixing path (2), has at least one fuel nozzle (6) for injection of the fuel into the mixing path (2), and also has at least one oxidator outlet orifice (7) for introducing an oxidator into the mixing path (2). The fuel feed (8) extends in the lance (3) and is connected to the at least one fuel nozzle (6). The oxidator feed (10) extends in the lance head (5) and is connected to the at least one oxidator outlet orifice (7). In order to improve the operation of the burner (1), the at least one oxidator outlet orifice (7) is located centrally on the lance head (5), and the at least one fuel nozzle (6) is installed on the lance head (5), being offset radially outwards with regard to the at least one oxidator outlet orifice (7).
摘要:
A premixing burner for generating an ignitable fuel/air mixture has a swirl generator with at least two burner shells (1) which complement one another to form a throughflow body and which jointly enclose an axial conically widening swirl space and delimit, with respect to one another in the axial longitudinal extent of the cone, tangential air inlet slits (3) through which combustion supply air passes into the swirl space in which an axially propagating swirl flow is formed, and with fuel injection devices, which are provided at least partially along the tangentially running air inlet slits (3). The fuel injection devices are designed as a fuel line (6) which is separate from the burner shell (1) and which is firmly attached to the burner shell (1) so as to be longitudinally movable with respect to the burner shell (1) and so as to be releasable perpendicularly to the surface of the burner shell (1), and in that, in the burner shell (1), orifices (4) are provided, into which issue fuel injectors (7) which are provided along the fuel line (6) and which project beyond the circumferential edge of the fuel line (6).
摘要:
A burner (24) which is useful for operating a heat generator includes a first upstream swirl generator (17) capable of swirling a combustion air stream, a device for injecting at least one fuel into the combustion air stream from the upstream swirl generator (17), an exit ring (1) located at the downstream end of the burner (24) at the edge to the combustion chamber (2) where the fuel is burnt, and preferentially a mixing section (20, 21) downstream from the upstream swirl generator (17) having a downstream end, having at least one transfer duct (20) for transferring downstream a flow of combustion air and fuel formed in the upstream swirl generator (17), and having a mixing tube (21) downstream from the at least one transfer duct (20) and receiving flow from the at least one transfer duct (20), wherein the downstream end of the mixing section borders the combustion chamber (2) and is formed by the exit ring (1). Pilot mode operation of such a burner (24) is advantageously and economically made possible by providing a pilot burner system (8, 15, 28, 35) in the exit ring (1) for injecting liquid fuel (27) into the combustion chamber (2).
摘要:
In a burner for operating a heat generator, which burner essentially comprises a swirl generator (100), a transition piece (200) arranged downstream of the swirl generator, and a mixing tube (20), transition piece (200) and mixing tube (20) form the mixing section of the burner, this mixing section being arranged upstream of a combustion space (30). In the region of the tangential combustion-air-directing inflow ducts (101b-104b), fuel-directing ducts (121-124), the cross section of flow of which is designed for a low-calorific fuel (116), extend along the swirl generator (100). The fuel-directing ducts (121-124) end at a distance upstream of the transition of the tangential inflow ducts (101b-104b) into an interior space of the swirl generator (100), whereby partial mixing between the two media (115, 117) takes place before the mixture flows into the interior space (118). In addition, this setting-back provides sufficient space for other fuel-directing lines (111-114) in this region.
摘要:
A premix burner for producing an ignitable fuel/air mixture has a swirl generator with at least two burner shells (B) which complement one another to form a throughflow body, which in each case have a first burner shell section (1) with a partial cone shape and together enclose an axially conically widening swirl space and which mutually define, in the axial cone longitudinal direction, tangential air inlet slots (LS), through which the combustion feed air (L) passes into the swirl space, in which an axially spreading swirl flow forms, and includes fuel feeds which are arranged at least in sections along the tangentially running air inlet slots (LS). A second burner shell section (8) curved in opposition to the first burner shell section (1), in each case designed in a partial cone shape, is added flush to the first burner shell section (1), a third burner shell section (9) adjoins the second burner shell section (8) flush, the third burner shell section (9) having a curvature tangentially adapted to the second burner shell section (8), and the third burner shell section (9) defines, on the one side in each case, one of the tangential air inlet slots (LS) and provides a leading edge (12) serving for the combustion feed air (L).
摘要:
A burner (24) which is useful for operating a heat generator includes a first upstream swirl generator (17) capable of swirling a combustion air stream, a device for injecting at least one fuel into the combustion air stream from the upstream swirl generator (17), an exit ring (1) located at the downstream end of the burner (24) at the edge to the combustion chamber (2) where the fuel is burnt, and preferentially a mixing section (20, 21) downstream from the upstream swirl generator (17) having a downstream end, having at least one transfer duct (20) for transferring downstream a flow of combustion air and fuel formed in the upstream swirl generator (17), and having a mixing tube (21) downstream from the at least one transfer duct (20) and receiving flow from the at least one transfer duct (20), wherein the downstream end of the mixing section borders the combustion chamber (2) and is formed by the exit ring (1). Pilot mode operation of such a burner (24) is advantageously and economically made possible by providing a pilot burner system (8, 15, 28, 35) in the exit ring (1) for injecting liquid fuel (27) into the combustion chamber (2).