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Sequentially Reheat of Combustor Impingement Cooling Air in Turbine Cooling

IP.com Disclosure Number: IPCOM000170671D
Published in the IP.com Journal: Volume 8 Issue 6A (2008-06-09)
Included in the Prior Art Database: 2008-Jun-09
Document File: 3 page(s) / 294K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In a gas turbine, impingement cooling is widely applied to cool combustors in both primary and secondary zones as shown in the diagram in Fig. 1. In the prior art, cooling capacity of the impingement cooling air is wasted when dumping into hot gas path. A novel cooling scheme utilizing the combustor impingement cooling air for the sequential reheat in turbine cooling for both liquid and gas operation is presented. The novel solution can be applied to both annular and can combustor systems. The reheating concept is illustrated in the schematic diagram in Fig. 2. By implementing "Divider" and "Directing Channel" in the combustor impingement cooling channel, a part of the impingement cooling air can be extracted from the combustor cooling system and it will be collected and sequentially reheated in the compressor turbine and power turbine cooling systems (see Fig. 3).

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Sequentially Reheat of Combustor Impingement Cooling Air in Turbine Cooling

Idea: Dr. Kam-Kei Lam, GB-Lincoln

In a gas turbine, impingement cooling is widely applied to cool combustors in both primary and

secondary zones as shown in the diagram in Fig. 1. In the prior art, cooling capacity of the

impingement cooling air is wasted when dumping into hot gas path.

A novel cooling scheme utilizing the combustor impingement cooling air for the sequential reheat in

turbine cooling for both liquid and gas operation is presented. The novel solution can be applied to

both annular and can combustor systems. The reheating concept is illustrated in the schematic

diagram in Fig. 2. By implementing "Divider" and "Directing Channel" in the combustor impingement

cooling channel, a part of the impingement cooling air can be extracted from the combustor cooling

system and it will be collected and sequentially reheated in the compressor turbine and power turbine

cooling systems (see Fig. 3).

Sequentially reheated cooling air may be applied for the blade cooling of the turbine by using the air in

impingement, film, effusion and internal convection cooling on the blades (see Fig. 4). Alternatively,

the reheated cooling air may be used in the film and effusion cooling on the turbine platform (see Fig.

5).

Sequential cooling gives great performance benefits by utiliz...