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Multi-cone premix burners for gas turbines

A technology of gas turbines and burners, which is applied in the direction of gas turbine devices, gas fuel burners, burners, etc., and can solve problems such as non-formation

Active Publication Date: 2015-11-18
ANSALDO ENERGIA SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, when applying a mixing tube to further promote fuel-air mixing at the downstream portion of the burner, the problem is to define the transition piece between the swirler and the mixing tube so that no recirculation zone is formed that could lead to flashback

Method used

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  • Multi-cone premix burners for gas turbines
  • Multi-cone premix burners for gas turbines

Examples

Experimental program
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Embodiment Construction

[0031] In known AEV burner design concepts a transition piece is required in order to adapt the sickle-shaped cross-section at the swirler outlet to the cylindrical cross-section of the mixing tube (see eg document WO2009 / 019113A2 cited above). This transition piece requires careful aerodynamic layout in order to avoid flow separation and resulting flashback.

[0032] The present invention avoids the need for a transition piece. The downstream end of the conical casing is formed such that the casing is cut in the cylindrical shape of the burner ring which is an integral part of the withdrawable burner. figure 1 with figure 2 The illustrated embodiment shows the basic principle of this solution.

[0033] figure 1 The premix burner 10 extends along a central burner axis 11 . The burner comprises four identical casings 12a-d which are part of a virtual cone open in the downstream direction (extending from left to right in the figure). The casings are displaced from their in...

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Abstract

The invention relates to a multi-cone premix burner (10) for a gas turbine comprising a plurality of housings (12a-d) surrounding a central burner axis (11) Arranged and are sections of an imaginary axially extending common cone open in the downstream direction, wherein said section is displaced perpendicular to said burner axis (11) so that in each pair of adjacent casings (12a- d) A tangential slot (14) is defined therebetween. Unfavorable transition pieces between the housing and the downstream mixing tube are avoided by delimiting the downstream end of the housing (12a-d) by a transverse plane (17) by utilizing a A virtual coaxial cylinder is defined transversely to said housing (12a-d).

Description

technical field [0001] The present invention relates to gas turbine technology. The invention relates to a multi-cone premix burner for a gas turbine according to the preamble of claim 1 . Background technique [0002] Burners with a short but effective premixing zone (so-called EV burners: environmentally friendly V-burners) have been used at very low NOx levels in several of the applicant's gas turbines over the past 20 years accomplish. In addition to this, three variants of premixing technology have been successfully developed and deployed in these gas turbine engines: Sequential EV burner, which is a method that allows natural gas and oil to be premixed into the hot exhaust stream for reheating technologies for the exhaust of the first high-pressure turbine; the MBtuEV burner, which is used to burn syngas in a premixed flame with low NOx emissions; and the Advanced EV burner (AEV), which is capable of Pre-vaporizes and pre-mixes liquid fuels prior to combustion and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23R3/02
CPCF23C7/002F23C2900/07002F23R3/286F02C7/00F23D14/02F23D14/46
Inventor E.帕斯夸罗托H.克内普菲尔
Owner ANSALDO ENERGIA SWITZERLAND AG
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