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Numerical study of internal flue gas recirculation system applied to methane-hydrogen powered gas microturbine combustor

Fąfara Jean-Marc, Modliński Norbert

Combustion Engines

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2023

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R. 62, nr 1

63--77

EN

Sources of renewable energy have been increasingly used all over the world. This kind of energy is highly desirable because of its unlimited availability. Unfortunately, renewable energy production very much depends on weather conditions. Consequently, it is necessary to store the produced excess energy in order to use it when needed. There is a technology able to produce a hydrogen/methane fuel from excess renewable energy, which may be stored. This technology is called the Power-to-Gas technology (P2G). Since the efficiency of this technological process depends on the hydrogen fraction in the renewable energy fuel, there is a need to increase this fraction. Concurrently, the gas microturbine technology is increasingly widely used in various industries (aviation, energy, automotive, military, etc). The P2G technology and the gas microturbine technology are likely to be integrated in the near future and, as mentioned above, the hydrogen fraction in the methane-hydrogen fuel will tend to increase. In order to power a gas microturbine with the methane-hydrogen fuel, it will be necessary to modify the combustor to avoid an excessive temperature increase and flashbacks. In this paper it is proposed to apply an autonomous internal exhaust gas recirculation system to resolve the hydrogen combustion problems indicated above. The operating principle and the proposed design of the recirculation system and the latter’s impact on the combustor’s operating parameters and emissivity (NOx and CO) are presented.

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Numerical investigation of the internal flue gas recirculation system applied to methane powered gas microturbine combustor

Fąfara Jean-Marc, Modliński Norbert

Combustion Engines

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2021

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R. 60, nr 4

21--29

EN

The gas microturbines gain significance in various industry sectors. One of their most crucial advantages is the capability of utilizing variety of fuels. At the same time, the emissions regulations become increasingly strict. This is why there is a need to look for a new technological solution to limit the emissions of selected substances, like carbon monoxide (CO) and nitrogen oxides (NOx). The internal recirculation of the flue gases is well known to limit the temperature peak and for the homogenization of the temperature field gradient in different combustion chambers. This paper presents a numerical investigation of a novel internal flue gas recirculation system applied to gas microturbine combustors. The ability to perform an internal exhaust gases recirculation by adding a combustor internal pipe system was verified numerically. This paper exposed the numerical investigation methods and obtained results. The study presents the concept and results performed on three cases of internal exhaust gases recirculation systems applied to a reference combustor. The work permitted to demonstrate numerically that it is possible to perform an autonomous exhaust gases recirculation inside gas micro-turbine combustor at a maximum global rate of 0.51%, and that the recirculation system has an impact on the combustion processes without specially modifying the combustor work parameters.

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Wewnętrzny układ r ecyrkulacji spalin w mikroturbinach gazowych jako me toda do współspalania paliw z e zwiększonym udziałem wodoru

Fąfara Jean-Marc, Modliński Norbert

Zeszyty Energetyczne

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2020

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T. 7

107--127

PL

Niniejszy artykuł prezentuje podstawowe charakterystyki technologii Power-to-Gas (P2G), mikroturbin gazowych oraz zasadność i trudności wzajemnego integrowania powyżej wymienionych technologii. W dalszej części publikacji zostanie opisana nowa koncepcja samoistnego wewnątrzkomorowego zawracania spalin w komorach spalania mikroturbin gazowych, której zadaniem będzie umożliwienie zintegrowania technologii P2G z mikroturbinami.