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H2/O2 Steam Generator

The production of energy from renewable sources is increasing worldwide in the context of climate change. At the same time as renewables increase, there is a rising demand for energy storage and spinning network reserves, because wind and solar power is pretty unpredictable. The combustion of hydrogen and oxygen can be a clean and flexible method in order to cover both services if these gases are produced by electrolysis from excess energy of renewable generated. The exhaust gas of this combustion process is pure superheated steam and thus, there will be no greenhouse gas emissions. The development and investigation of such a stoichiometric H2/O2 steam generator is driven at the Chair of Fluid Dynamics. In contrast to earlier efforts to realize this concept, where rocket combustion technology was adapted for energy generation, in the recent investigations a swirl-stabilized burner is used for the humidified combustion of hydrogen and pure oxygen. The gases are injected into an environment of steam, which lowers the adiabatic flame temperature down to a technically applicable level. The specific challenge of the proposed H2/O2 steam generator concept is that the combustion process must be as complete as possible. No residues of hydrogen or oxygen must be in the exhaust steam, if the system is integrated in a steam cycle plant. To reach this goal the project team takes advantage from the high combustion efficiency that is usual for swirl-stabilized burners. Nevertheless, water tunnel measurements are necessary to optimize the burners flow field and mixing properties. Afterwards, selected configurations are investigated in a combustion test rig for combustion stability and efficiency.



Tom Tanneberger

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