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Exhaust diffuser for a gas turbine, and method thereof

a technology of exhaust diffuser and gas turbine, which is applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of reducing the pressure recovery of the diffuser, and achieve the effects of increasing the elasticity of adjustment, increasing the geometric control, and increasing the accuracy

Inactive Publication Date: 2013-05-16
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a new type of exhaust diffuser for a gas turbine that improves pressure recovery at different loads. It reduces flow separation, which helps to increase efficiency.

Problems solved by technology

However, a high outlet to inlet area ratio for a given axial length of the diffuser (i.e., large diffuser angle) causes rapid expansion of the gas leading to a separation of flow of the gas from the diffuser wall, which, in turn, causes a reduction in the pressure recovery by the diffuser.

Method used

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  • Exhaust diffuser for a gas turbine, and method thereof
  • Exhaust diffuser for a gas turbine, and method thereof
  • Exhaust diffuser for a gas turbine, and method thereof

Examples

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Embodiment Construction

[0026]Referring now to FIG. 1 is illustrated an exhaust diffuser assembly 1 (also referred to as “diffuser 1”) for a stationary gas turbine, for example, used in power generation and mechanical drives in land based applications. The diffuser 1 has an inlet 3 having a first cross-sectional area A1 for receiving a mainflow gas from a last stage of a turbine section 60. The gas 5 flows along a longitudinal axis 2 through a conduit defined by a diverging diffuser wall 7 extending from the diffuser inlet 3 to a diffuser outlet 4 having a second cross-sectional area A2. The diffuser outlet 4 directs the gas 5 to an exhaust duct 80.

[0027]The diffuser wall 7 serves to recover pressure from the gas by expanding the gas between the inlet 3 and the outlet 4. This reduces the total head loss of the gas, thereby increasing the work extracted from the gas 5. The diffuser wall 7 makes an angle of divergence ‘α’ with respect to the longitudinal axis 2. In conventional diffusers, the divergence angl...

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Abstract

An exhaust diffuser assembly is provided, particularly for a stationary gas turbine. The exhaust diffuser assembly includes a longitudinal axis, a diffuser inlet for receiving a turbine mainflow gas, a diffuser outlet, and a diverging diffuser wall having an adjustable geometry and forming a conduit for flow of the gas therethrough from the diffuser inlet to the diffuser outlet. The diffuser wall has a divergence angle ‘α’ with respect to the longitudinal axis. The diffuser assembly also has a diffuser geometry control device for controlling a recovery of pressure from the gas between the diffuser inlet and the diffuser outlet by adjusting the divergence angle ‘α’ of the diffuser wall to cause a resultant flow field of the gas that is attached to the diffuser wall.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2011 / 062246, filed Jul. 18, 2011 and claims the benefit thereof. The International Application claims the benefits of European application No. 10007757.7 EP filed Jul. 26, 2010. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The present invention relates to exhaust diffusers for gas turbines, particularly for gas turbines in stationary or land based applications.BACKGROUND OF INVENTION[0003]In gas turbines, for example those used in power generation, exhaust diffusers serve to reduce the speed of the exhaust flow in a gas turbine and to thus recover pressure from the exhaust gas coming from the last stage of the turbine. The reduction in gas speed reduces the stress associated with the fluid flow on the exhaust equipment and enhances the performance levels of the turbine by recovering pressure from the e...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01D25/30
CPCF05D2270/301F05D2250/232F05D2270/17F01D25/30F05D2220/32
Inventor BEECK, ALEXANDER R.MARINI, BONNIE D.
Owner SIEMENS AG