Burner

a burner and burner technology, applied in the field of burners, can solve the problems of a flashback of flame and a gradual overheating of the burner, and the recirculation zone can detach from the burner outlet and become unstable, strong, and damag

Inactive Publication Date: 2002-09-12
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The danger then exists of a flashback of the flame and a gradual overheating of the burner.
If on the other hand the axial flow is too strong, the recirculation zone can detach from the burner outlet and become unstable.
The consequence

Method used

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first embodiment

[0022] Burners according to the preamble of the claims are likewise known from WO 93 / 17279 and EP 0 945 677, and have cylindrical swirl generators with tangential combustion air inlets. In this connection it is also known to arrange a displacement member, tapering toward the burner mouth, in the interior of a cylindrical swirl generator. The favorable criterion given above for the axial throughflow cross section of the swirl generator, namely that the axial throughflow cross section increases in the axial throughflow direction, is fulfilled by means of such a swirl generator internal member. Embodiments of such burners are shown in FIGS. 9 and 10. The first embodiment in FIG. 9 shows the principle of such a burner. The mode of operation is sufficiently known and explained in principle in connection with FIG. 1; deviating from the embodiment shown in FIG. 1 of a burner according to the invention, the embodiment shown in FIG. 9 of course has a conical compression member which tapers i...

second embodiment

[0030] A second embodiment, shown in FIG. 15, concerns the use of the burner according to the invention in gas turbine plants, for which the burner according to the invention is especially suitable. In the example in FIG. 15, a compressor 10, a turbine 30, and a generator 40 are arranged on a common shaft. The compressor 10 is equipped with an adjustable front guide vane set 11. A combustion chamber 20 is arranged in the flow path of a working medium, between the compressor 10 and the turbine 30. The combustion chamber 20 is operated with at least one burner 1 according to the invention. A regulating signal Y is passed from a control unit 3 to the adjustable device for the injection of the axial central flow. In the example shown, the control unit 3 receives a power signal X.sub.P, signals X.sub.AMB from sensors (not shown) which determine ambient conditions--temperature, moisture, pressure, etc.--of the ambient air, and also a signal X.sub.VLE which reproduces the position of the f...

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Abstract

An aerodynamically stabilized premix burner essentially comprises a swirl generator (100) for generating a rotating combustion air flow (141), and means for introducing at least one fuel (142) into said combustion air flow. Furthermore, the burner is equipped with means (112) for introducing an axial air flow into the center of the generated rotational flow (144). According to the invention, this axial flow can be controlled, thus enabling an influence on the position and intensity of a flame stabilizing recirculation zone (123).

Description

[0001] The invention describes a burner for a heat generator according to the preamble of claim 1.STATE OF THE ART[0002] From EP 0 321 809, EP 0 780 629, WO 9317279, and EP 0 945 677, premixing burners are known in which a combustion air flow is introduced tangentially into a burner interior by means of a swirl generator and is mixed with fuel. At the burner outlet, the resulting vortex flow bursts open at a jump in cross section, inducing a recirculation zone which serves to stabilize the flame in operation of the burner.[0003] The axial position of the recirculation zone which arises is of critical importance for the stabilization of the flame, and in its turn is substantially determined by the axial flow in the center of the burner. If this axial flow is too weak, the recirculation zone, and with it the flame, migrates into the burner interior. The danger then exists of a flashback of the flame and a gradual overheating of the burner. If on the other hand the axial flow is too st...

Claims

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Application Information

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IPC IPC(8): F23C7/00F23D14/02
CPCF23C7/002F23C7/008F23C2900/07002F23D14/02F23R2900/00013F23R2900/00014
Inventor DITTMANN, ROLFSTEINBACH, CHRISTIAN
Owner ALSTOM TECH LTD
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