A4 Conference proceedings

Three spool high efficiency small scale gas turbine concept

Publication Details
Authors: Malkamäki Matti, Jaatinen-Värri Ahti, Uusitalo Antti, Grönman Aki, Honkatukia Juha, Backman Jari, Hartikainen Toni
Publication year: 2017
Language: English
Related Journal or Series Information: ASME Turbo Expo
Title of parent publication: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition: Volume 8 Microturbines, Turbochargers and Small Turbomachines; Steam Turbines
Volume number: 8
ISBN: 978-0-7918-5095-4
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication


Decentralized electricity and heat production is a rising trend in small-scale industry. There is a tendency towards more distributed power generation. The decentralized power generation is also pushed forward by the policymakers. Reciprocating engines and gas turbines have an essential role in the global decentralized energy markets and improvements in their electrical efficiency have a substantial impact from the environmental and economic viewpoints. This paper introduces an intercooled and recuperated three stage, three-shaft gas turbine concept in 850 kW electric output range. The gas turbine is optimized for a realistic combination of the turbomachinery efficiencies, the turbine inlet temperature, the compressor specific speeds, the recuperation rate and the pressure ratio. The new gas turbine design is a natural development of the earlier two-spool gas turbine construction and it competes with the efficiencies achieved both with similar size reciprocating engines and large industrial gas turbines used in heat and power generation all over the world and manufactured in large production series. This paper presents a small-scale gas turbine process, which has a simulated electrical efficiency of 48% as well as thermal efficiency of 51% and can compete with reciprocating engines in terms of electrical efficiency at nominal and partial load conditions.

Last updated on 2018-19-10 at 07:55