A low-swirl premix nozzle for a low-pollution combustor of a gas turbine

A technology of gas turbines and premixing nozzles, applied in combustion chambers, continuous combustion chambers, combustion methods, etc., can solve problems such as large flow resistance, achieve the effects of small flow resistance loss, reduce emissions, and increase flame stability

Active Publication Date: 2017-05-10
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This premixing method can achieve sufficient premixing of fuel and air, but the flow resistance is relatively large

Method used

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  • A low-swirl premix nozzle for a low-pollution combustor of a gas turbine
  • A low-swirl premix nozzle for a low-pollution combustor of a gas turbine
  • A low-swirl premix nozzle for a low-pollution combustor of a gas turbine

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Embodiment

[0028] Such as Figure 4 As shown, in the actual gas turbine combustor, an annular or tubular multi-nozzle arrangement structure with nozzles close to each other is usually adopted. The multi-nozzle structure can not only increase the heat load and load regulation ratio of the combustion chamber, but also ensure that when one nozzle is extinguished, the adjacent nozzles can re-ignite it to maintain a stable flame. As shown in the figure, in the specific arrangement, the low-swirl nozzle of the present invention can be used according to the structure of the actual gas turbine to form a gas turbine combustor with a multi-nozzle structure. The central nozzle is the on-duty nozzle 9; the outer side is the low-swirl nozzle 8 of the present invention, the nozzles are evenly arranged along the axial direction of the central nozzle, and the number of the outer nozzles is 4-8.

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Abstract

The invention discloses a low-swirl premix nozzle of a gas turbine low-pollution combustion chamber. Fuel is ejected in a swirler flow channel and a center flow channel, sufficient premix of air at the outlet of the nozzle and the fuel is guaranteed, the structure is compact, and flow resistance losses are small. The nozzle works in a lean premix state, the equivalence ratio during work is close to 0.6-0.8, at the time, temperature of flames is low, and generation of thermal NOx is reduced; swirl strength of air flow at the outlet of the nozzle is low, a downstream back-flow area of the nozzle is weak, or a back-flow area is basically not formed, residence time of high-temperature reactants in a combustion chamber is shortened, generation of NOx is reduced, and emissions of combustion pollutants are reduced; a conical section flame stabilizing cover is additionally disposed at the outlet of the nozzle, so that the air flow of the outlet of the nozzle is free of influences of swirls on the outlet of the nozzle, and flame stability is improved. Meanwhile, the flame stabilizing cover can further reduce speed pulsation of the outlet of the nozzle, and thermo-acoustic stability of the premix nozzle is improved.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a low-swirl premixing nozzle suitable for low-pollution combustion chambers of gas turbines. Background technique [0002] With the increasing awareness of environmental protection, people's requirements for emissions are also getting higher and higher. In particular, the NOx content in the emissions is strictly regulated. This has forced gas turbine manufacturers to introduce new technologies and develop combustors that can meet emission requirements. In the past decade, new concepts introduced into gas turbine combustion technology include: lean premixed combustion (lean-premixed combustion, LPM), rich-burn quick-quench lean-burn combustion (RQL) and catalytic combustion (catalytic combustion). Among these three methods, the generation of soot and the incomplete mixing of fuel-rich products with air hinder the wide application of RQL, and catalytic combustion is limited...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23R3/38F23R3/18
Inventor 柳伟杰葛冰臧述升
Owner SHANGHAI JIAOTONG UNIV
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