Premixed Laminar Oxycombustion of Hydrogen with Carbon Dioxide as a Working Fluid
Keywords:constant volume combustion chamber, oxycombustion, combustion, methane, natural gas, instabilities, laminar combustion, laminar burning velocity
Hydrogen (H2) is an attractive alternative fuel due to its inherent carbon-free emissions and potential compatibility with the existing transportation and energy conversion technologies. However, outside of generation/distribution concerns, several challenges exist before widespread implementation - including fundamentally different combustion properties in comparison to natural gas and other common hydrocarbon fuels. For example, the maximum laminar burning velocity (LBV) of hydrogen is over 7 times greater than that of natural gas when combusted in air, where nitrogen is the primary working fluid. To balance this dramatic increase, carbon dioxide (CO2) can be used as a working fluid to reduce the speed with which a flame front expands. The combination of hydrogen as a fuel with carbon dioxide as a working fluid therefore provides the opportunity to achieve flames with LBVs that are appropriate for practical combustion applications such as internal combustion engines and gas turbines. Furthermore, the inclusion of CO2 avoids the production of NOx emissions and enables several opportunities for carbon sequestration or closed-cycle processes. This study experimentally explores the premixed oxycombustion properties of H2/CO2 mixtures in a constant volume combustion chamber (CVCC) at varied initial pressures and equivalence ratios. The spherically expanding flames are examined to determine the laminar burning velocity, flammability limits, and instabilities present in the H2/O2/CO2 system.
Copyright (c) 2022 Md Nayer Nasim, Behlol Nawaz, Amina SubLaban, John Hunter Mack
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