摘要:
In a double-cone burner, at least one row of nozzles (10) for a gaseous fuel containing highly reactive components and having a medium calorific value are arranged on the periphery of the partial conical bodies (1, 2) of the burner near the burner outlet at a distance of approximately 30% of the nominal burner diameter. In addition, there is a fuel conduit (11) and a distributing passage (17), placed in the region of the nozzles (10), for the highly reactive fuel. The gaseous fuel (15) containing highly reactive components is injected at high velocity through the nozzles (10), which have a diameter which is smaller than 1% of the nominal burner diameter, into the zones of high air velocity and the penetration depth and the direction of the fuel jets are matched to one another in such a way that ignition only takes place behind the burner, after mixing has occurred.
摘要:
A premixing burner (X) which consists essentially of at least two hollow partial bodies (1, 2), which are positioned one above the other and whose center lines (1b, 2b) extend offset relative to one another in the longitudinal direction of the partial bodies (1, 2), is employed for hot gas generation, for example in a firing plant. Due to this offset, tangential inlet slots (21, 22) respectively occur through which a combustion airflow (15) flows into the internal space (14) of the premixing burner (X). Venturi mixers (32) with fuel nozzles (36), through which a fuel (31) is introduced into the combustion air (15) flowing past at this point, are arranged in the region of these tangential inlet slots (21, 22).
摘要:
In the case of a heat generator which essentially consists of a premix burner (100) and a flame tube (1), the hot gases (10) from the combustion in the premix burner (100) are fed into the flame tube (1), and there undergo staged post-combustion. This post-combustion takes place by means of a first post-combustion stage (11) and a second post-combustion stage (12). The air/fuel mixture (11a, 12a) is provided for each post-combustion stage (11, 12) in individual mixers (200, 300). These mixers are arranged axially with respect to the flame tube (1) and work in such a way that injection of the corresponding mixture (11a, 12a) makes it possible to obtain different combustion zones which extend in a staged sequence over the flame tube (1). By virtue of this staged post-combustion mode NO.sub.x emissions can be reduced by a factor of 5 compared to conventional techniques.
摘要:
In a burner for premixing-type combustion of a liquid and/or gaseous fuel, which essentially comprises hollow conical part-bodies (1, 2) positioned one upon the other, the center lines of which extend mutually offset in the longitudinal direction, whereupon tangential inlet openings (1b, 2b) are formed on both sides of the burner, a fuel (5a) is admixed to the combustion air (13) flowing into the interior (3) of the burner in that area. This admixture is accomplished via a number of nozzles (9, 10), which act in the region of the inlet openings (1b, 2b). The fuel through these nozzles is injected with a small spray cone angle in the longitudinal direction of the slot. The fuel vaporization takes place essentially only in the inlet openings of the burner, with the result that only a fuel vapor enters the interior (3). A further central nozzle (4) supplied with a liquid and/or gaseous fuel provides assistance in the form of a limit fuel quantity. The ignition of the mixture (4a, 5a, 13) takes place at the outlet of the burner, stabilization of the flame front (14) being brought about in the region of the burner aperture by a return flow zone (15).
摘要:
A premixing burner on the double-cone principle consists essentially of two hollow conical partial bodies (111, 112) which are interleaved in the flow direction and whose respective center lines (113, 114) are offset relative to one another. The adjacent walls of the two partial bodies form tangential gaps (20) in their longitudinal extent for the combustion air. Gas inlet openings (117) distributed in the longitudinal direction are provided in the walls of the two partial bodies. The air is guided into the tangential gaps (20) via vortex generators (9) of which a plurality are arranged adjacent to one another. The fuel is introduced into the gaps (20) in the immediate region of the vortex generators (9).Using the novel static mixer which the three-dimensional vortex generators represent, longitudinal vortices without recirculation region can be generated in the inlet gap through which flow occurs. It is therefore possible to achieve extraordinarily short mixing distances at the inlet to the burner with a small pressure loss at the same time.
摘要:
In a method of operating a plant with staged combustion, the first combustion stage (1a) is operated with a fuel/air mixture (3) whose air coefficient is larger than the overall air coefficient of the combustion system. The hot combustion gases (5) from the first combustion stage (1a) are mixed with an additional fuel/air mixture (4) whose air coefficient is smaller than the overall air coefficient of the combustion system, before the further combustion in the second stage (2a) takes place. Since hot-gas backmixing is no longer required in the second stage (2a) for the flame stabilization, this combined mixture burns without the formation of further NOx emissions.
摘要:
The object of the invention is to provide a novel cone burner for gaseous and/or liquid fuels which has a reduced NOx and CO emission. According to the invention, this is achieved in that the sectional cone bodies (1, 2) have a common outlet diffuser (27) at their downstream end. They have a transition region (28) to the outlet diffuser (27), in which the size of the air-inlet slots (7, 8) decreases continuously in the direction (3) of flow. The outlet diffuser (27) is designed to be circular and without air-inlet slots (7, 8).
摘要:
Described are a gas-turbine construction and a method of operating this gas-turbine construction, having an air compressor, a heat exchanger connected downstream of the air compressor, a combustion chamber, and a turbine which can be driven by hot combustion gases and from which the combustion gases are fed to the heat exchanger for heating the compressed supply air coming from the air compressor. The invention is distinguished by the fact that the heat exchanger and the combustion chamber are integrated in a common unit, and that fuel can be added to the supply air before entry into the unit, which fuel can be ignited catalytically in the form of an air/fuel mixture inside the unit, in which a catalyst is provided.
摘要:
In a burner (1) for a heat generator, having a throughflow passage (3) for the throughflow of a combustion-air flow (12), a hentral main fuel lance (5) acts inside the said throughflow passage (3). A number of mixing elements (6) are arranged in an annular manner around this main fuel lance (5), and the remaining annular throughflow cross section is covered concentrically hereto by swirl generators. The mixing elements (6) are fed with a fuel (13a) and a partial combustion-air quantity (12a). The mode of operation of these mixing elements (6) corresponds to that of a pilot stage, whereby the flame stability is increased, while the NOx emissions remain at a low level.
摘要:
A gas turbine apparatus for higher pressure and temperature ratio operation, improved thermal efficiency and minimized NO.sub.x emissions includes a high pressure compressor, a high pressure turbine, a low pressure turbine and combustion chambers for each of the turbines. A diffuser guides exhaust gas from the high pressure turbine and retards the velocity of the gases. A 180.degree. bend downstream of the diffuser changes the flow direction of the gases. Fuel lances extend into the bend at the outlet end to inject fuel into the gases after the direction change. The bend directs the gas and fuel into a reversal combustion chamber where the gases and fuel again changes direction by 180.degree., and a ring vortex in the flow is produced. The fuel and air is ignited and combusted, and the combusted gases directed into the low pressure turbine.