Head design of combustion chamber of twin-stage premixing ground-based gas turbine

A combustor and head technology, which is applied in the field of dual-stage premixed ground gas turbine combustor head design, can solve the problems of increased NOx emissions and increased fuel non-uniformity, and achieve reduction of NOx emissions, improvement of combustion efficiency, Avoid the effect of localized high temperature zones

Inactive Publication Date: 2016-06-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
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Problems solved by technology

But at the same time, due to the increase of the fuel ratio for diffusion combustion, the inhomogeneity of the fuel increases, a local high temperature area appears, and the NOx emission will increase greatly

Method used

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  • Head design of combustion chamber of twin-stage premixing ground-based gas turbine
  • Head design of combustion chamber of twin-stage premixing ground-based gas turbine

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:

[0013] Such as figure 2 As shown, the combustor head design of a two-stage premixed surface gas turbine in this embodiment includes a swirl tube 4 at the center duty level and a swirl tube 5 at the outer main combustion level. In this embodiment, in the on-duty swirl barrel, the first swirler and the second swirler 8 are fixed on the duty-grade fuel spray rod 3 .

[0014] The total length of the straight cylindrical swirl tube 4 in the center of the combustion chamber head is 120 mm to 140 mm, and the diameter is 100 to 110 mm. Two swirlers are installed at the front and back of the swirl cylinder 4: the first swirler 6 is axially 8-12 mm away from the inlet end, and the blade height of the first swirler 6 is 32-33 mm. The angle is 30-40°, the number of blades is 12-14; the axial distance of the second swirler is 105-115mm from the inlet end, the...

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Abstract

The invention provides a head design of a combustion chamber of a twin-stage premixing ground-based gas turbine. The basic structure of the head comprises a central vortex tube, a crescent-shaped flame stabilizer and an outside annular vortex tube, wherein the central vortex tube is provided with double hydrocyclones; the crescent-shaped flame stabilizer is arranged at the down stream of the central vortex tube; and the outside annular vortex tube surrounds the central vortex tube. According to the design, a full-premixing combustion mode of the head is adopted mainly, so that the emission of NOx is reduced; air entering from a central value grade vortex tube of the head firstly passes through the first hydrocyclone, and then is mixed with ejected fuel; when a mixture flows out of the central vortex tube, the mixture is mixed and enhanced by the second hydrocyclone; at the same time, the hydrocyclone further prevents tempering; the central value grade premixed fuel forms a stable ignition source on the flame stabilizer; and the premixed fuel flowing out of the outside main burning stage is ignited, burning is carried out stably and mildly, and uniform combustion is achieved. The design can guarantee that the ground-based gas turbine can keep low emission of NOx and stable combustion on operating conditions of all loads.

Description

technical field [0001] The invention relates to the field of ground gas turbines, in particular to a design of a combustor head of a two-stage premixed ground gas turbine. Background technique [0002] With the development of ground gas turbine technology, modern ground gas turbines are pursuing ultra-low pollution emissions, and at the same time, they are developing in the direction of high temperature rise. The improvement of the overall performance of gas turbines puts forward higher requirements for the design of the main combustion chamber. [0003] figure 1 It is a structural schematic diagram of an existing general dry-type low-nitrogen oxide emission combustion chamber. The combustion cylinder is located in the combustion chamber. The 8 main cyclones of the device. The swirler is composed of swirl cylinders 5, 6 and blades 2, 7, and the blades 2, 7 are arranged around the central hole in the middle. The main fuel-level nozzle penetrates into the main cyclone cylin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23R3/58
CPCF23R3/58
Inventor 张群邢力汪玉明黎超超杨省喆闫东博李逸飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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