Considering the growing interest in Power-to-Fuel, e.g. production of H~2~ using electrolysis to store excess renewable electricity, combustion-based technologies still have a role to play in the future of power generation. Especially in a decentralised production with cogeneration, micro Gas Turbine (mGT) technologies offer great advantages related to their high adaptability and flexibility, in terms of operation and fuel. Hydrogen (or hydrogen enriched methane) combustion is well known to lead to flame and combustion instabilities. The high temperature and reaction rate reached in the combustor can potentially lead to flashback. In the past, combustion air humidification (or water addition) has proven effective to reduce temperatures and reaction rates, leading to significant NO~x~ emission reductions. Therefore, humidification in mGT can open a path to stabilize hydrogen combustion in mGT.

 

This work presents a comparison between typical methane and hydrogen enriched combustions in a typical mGT combustion chamber (Turbec T100) using Large Eddy Simulations analysis. In a first step, the necessary minimal water dilution, to reach stable and low emissions combustion with hydrogen, was assessed using a 1D approach. In a second step, based on high fidelity LES results, the feasibility and flexibility of humidified hydrogen enriched methane/air combustion in an industrial mGT combustor have been demonstrated. Results show stable and complete combustion, at similar CO and NOx emission levels compared to the reference case. These results will help future combustor design towards more stability.


Can Water Dilution Avoid Flashback on a Hydrogen Enriched Micro Gas Turbine Combustion? A Large Eddy Simulations Study

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

Turbo Expo - Virtual Conference

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.