Lean pre-mixing mold nozzle injecting fuel from blades and full-ring combustion room

Abstract

The invention relates to a lean pre-mixing mold nozzle injecting fuel from blades and a full-ring combustion room. By adopting a lean pre-mixing combustion technique, fuel injection orifices are uniformly distributed in blades of an axial cyclone radially, so that the uniformity of a fuel / air ratio in radial distribution is improved. In addition, the combustion equivalent ratio of swirl nozzles is0.55-0.75, so that the temperature in a combustion area is relatively low and is uniformly distributed without hot spots, and generation of heating power nitrogen oxides is reduced effectively. The axial cyclone is low in swirling flow, so that the standing time of high temperature fuel gas can be shortened, generation of the nitrogen oxides can be reduced, the turbulent fluctuation of the rotaryair flow can be also reduced, and the risk of backfire and vibrating combustion can be reduced. The wall temperature and the fuel / air ratio of a boundary layer can be reduced by means of diffusing holes in the wall surface of the outer wall of the cyclone, so that the risk of spontaneous combustion and backfire is reduced. In an actual combustion room, a multi-point lean pre-mixing combustion room head is formed by arranging a certain quantity of swirl nozzles same in dimension reasonably, and a main mold fuel is supplied in stages, so that a low pollution emission level of the combustion room in a full working condition range can be achieved.

Description

technical field [0001] The invention belongs to the field of gas turbine combustors, and relates to a lean premixed nozzle and a full-ring combustor in which fuel is injected from blades, in particular to a low-swirl nozzle scheme suitable for low-pollution combustors and based on lean premixed combustion technology . Background technique [0002] In recent years, as the problem of environmental pollution has become more and more serious, people's awareness of environmental protection has become stronger and stronger. Whether it is for aero-engines or ground gas turbines, the requirements for pollutant emissions have become increasingly stringent. For example, a series of standards formulated by the Committee on Environmental Protection (CAEP) under the International Civil Aviation Organization (ICAO) set strict regulations on the emissions of carbon monoxide, unburned hydrocarbons and nitrogen oxides. Only engines that meet the emission requirements can obtain airworthiness...

AI Technical Summary

Problems solved by technology

Through the analysis, it is found that the nozzle structure of the above-mentioned combustion chamber adopts the fuel combination injection method to enhance the fuel / air mixing, and the structure is complicated. Moreover, the swirlers all use straight blades, which are prone to flow separation and large flow loss, and there is no clear prevention of backfire and spontaneous combustion measures

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