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Accueil du site > Thèmes de recherche > Combustion & systèmes réactifs > 1.4 New combustion technologies for energy production

1.4 New combustion technologies for energy production

ICARE is involved in several projects related to currently emerging technologies for energy production with a common objective to reduce the environmental impact while preserving process efficiency. These studies are also good examples of intense co-operations within ICARE teams contributing to Chemical kinetics and Dynamics of combustion (see below the Groupe Thématique on Combustion Dynamics).

1.4.1. Combustion kinetics of lean mixtures
Combustion in lean conditions allows the reduction of soot and NOx emissions, however it can generate instabilities leading to flame extinction and production of harmful oxygenated compounds. In order to better understand the combustion reaction mechanisms in lean conditions, an experimental and numerical study was undertaken on methane, ethylene, propane and propene flames (ACL18) in order to constitute a detailed database on intermediate species containing 1 to 3 carbon atoms, which control the combustion kinetics of heavier fuels.

1.4.2. Coupling of oxygen-enriched combustion and CO2 capture
This study (CNRS PIE research project COCASE in collaboration with LRGP Nancy, CORIA Rouen and LCD Poitiers) aims at investigating a new technological solution for CO2 capture from fossil fuel burning power plants. It consists of coupling an oxygen-enriched combustion (typically 30-80% O2) with a CO2 capture by membrane separation processes (developed by LRGP, Nancy). This combination offers a CO2 capture process with a largely reduced energetic cost compared to conventional post-combustion or oxy-combustion processes. The overall purpose of the present work is to maximize the energy production by combustion while ensuring a correct operation of the global process in compliance with environmental legislations. First, a feasibility study was performed with numerical simulations of the energy required for this “hybrid” process. In parallel, combustion kinetics simulations were performed at ICARE in order to determine the best suited combustion conditions (ACTI 13, AFF 6). This numerical approach is now under experimental validation at CORIA (in a model gas turbine chamber) and LCD (in counter flow flames).

1.4.3. NO-hydrocarbons interaction at low temperatures
Recent auto-ignition engine concepts (HCCI, LTC) use exhausts gas recirculation (EGR) to control ignition timing. Under such conditions, EGR chemically affects ignition through interactions of fresh fuel-air mixture and unburned species or nitrogen oxides. Several studies were undertaken at ICARE in collaboration with engine research groups at PRISME-Univeristy of Orléans and IFP to better understand these chemical interactions and propose chemical kinetic models. These kinetic studies concerned simple fuels and reference fuels and demonstrated the need for further investigations to better understand NOx-hydrocarbons interactions (ACL5, ACL8-9, ACL17, ACL20, ACL31, ACL53, ACL67) and the chemical impact of unburned species (ACL34, ACL51).