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Lean premixed swirl nozzle of low-pollution combustion chamber and total-ring combustion chamber

A swirling nozzle and combustion chamber technology, applied in the field of gas turbine combustion chambers, can solve the problems of easy flow separation, no prevention of flashback and spontaneous combustion, and large flow loss, so as to reduce the risk of flashback and the generation of nitrogen oxides , the effect of accelerating the flow

Inactive Publication Date: 2018-10-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the analysis, it is found that the swirlers of the above-mentioned head schemes all adopt straight blades, which are prone to flow separation and large flow loss, and there are no measures to prevent backfire and spontaneous combustion

Method used

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  • Lean premixed swirl nozzle of low-pollution combustion chamber and total-ring combustion chamber
  • Lean premixed swirl nozzle of low-pollution combustion chamber and total-ring combustion chamber
  • Lean premixed swirl nozzle of low-pollution combustion chamber and total-ring combustion chamber

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specific Embodiment

[0037] Such as Figure 1-3As shown, the embodiment of the present invention provides a lean premixed swirl nozzle structure suitable for a low-pollution combustion chamber of a gas turbine, including an axial swirler 2, a fuel inlet 3, a fuel injection hole 4, an inner wall of the swirler 5, Cyclone outer wall 6, swirl flow channel 7, premixing section 8, converging section 9, nozzle outlet 10 and wall divergence small hole 11, said swirl flow channel 7 is composed of axial swirler 2, cyclone inner wall 5 and the swirler outer wall 6, the axial swirler blades 2 are curved blades, the number of blades is 6-20, the blade angle is 30°-60°, and the fuel inlet 3 is located in the swirl channel 7. Inside, the fuel injection holes 4 are opened on the swirler inner wall 5 between the two swirler blades, the injection direction is radially outward, and the number of injection holes is consistent with the number of swirler blades, which is 6-20 , the premixing section 8 is located down...

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Abstract

The invention relates to a lean premixed swirl nozzle of a low-pollution combustion chamber and a total-ring combustion chamber. The lean premixed combustion technology is adopted, a fuel jetting opening is located on an inner hub of a swirl, fuel and air begin to encounter and are mixed in a rotational flow runner and are further mixed in a pre-mixing segment, the fuel / air mixing uniformity is improved, in addition, the combustion equivalence ratio of the swirl nozzle ranges from 0.55 to 0.75, it is ensured that the temperature of the combustion area is low, and no local hot points exist, andgeneration of nitric oxide is effectively reduced; an outlet convergent section of the swirl nozzle can accelerate the fuel / air mixture flowing, and the tempering risks are reduced; wall face coolingholes in the outer wall of the swirl can reduce the wall temperature and the boundary layer fuel / air ratio, spontaneous combustion and tempering risks are reduced, in the actual combustion chamber, acertain number of swirl nozzles with the same size are reasonably arranged to form a multi-point lean premixed combustion chamber head, main mold fuel staged supply is adopted, and the low-pollutionemission level of the combustion chamber in the full-operating-condition range is achieved.

Description

technical field [0001] The invention belongs to the field of gas turbine combustors, and relates to a lean premixed swirl nozzle and a full-ring combustor for a low-pollution combustor, in particular to a lean premixed swirl nozzle solution for a low-pollution combustor. 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 certification; For ground gas turbines, althoug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23R3/38
CPCF23R3/38
Inventor 索建秦孙付军梁红侠于涵李乐黎明刘昭宇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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