Experimental and numerical study of NO formation in a domestic H2/air coaxial burner at low Reynolds number

Abstract

Highlights• Hydrogen is a potential fuel for domestic burners • NO x reduction can be achieved by flame splitting method • Laminar and turbulent flames show opposite NO x trends with increasing inlet powers • In low Reynolds number flames lower equivalence ratios imply higher NO x concentrations • Competing factors describing local NO x production intensity can be defined

Impact of H2/CH4 blends on the flexibility of micromix burners applied to industrial combustion systems

“…Finally, since NO x models are commonly decoupled from the main reaction mechanism, the reaction rates from the well-known thermal NO x Zeldovich mechanism were computed in a post-processing step using the converged temperature and species concentration values [17,21]. The calculation was carried out solving the transport equation for Y N O :…”

“…In that sense, non-premixed burners, which are commonly used in industrial burners and gas turbine combustors, are preferable since they ensure safer operating conditions avoiding flashback and explosion risk when fuelled completely by hydrogen. However, this type of flames react at near stoichiometric conditions, resulting in near-adiabatic flame temperatures and consequent increase in thermal NO x formation [20,21]. Therefore, the main techno-logical challenge concerning the design of hydrogen burners is to maintain both a high hydrogen fuel content under safe operating conditions and acceptable levels of thermal NO x emissions.…”

Optimum swirl angle of natural gas combustion in domestic cooker burner with various output port

“…On the other hand, the experimental studies are mainly focused on combustion temperature and water boiling test. Lopez-Ruiz et al 6 studied Thermal NOx formation in H 2 /air jet flames from a coaxial burner experimentally and numerically. the volume of the region where NOx is produced, and within this region, the competition between residence time and NOx reaction rate.…”

Study on hydrodynamic characteristics of swirl burner based on CFD

“…The blade thickness of the secondary cyclone is 1.2 mm, the axial length of the blade is 10 mm, and the number of blades is 12. The fluid volume data and mixture data are used as the data sources during the construction of the physical model of the swirl burner [9]. Since these two parts of data contain a large amount of particle calculation, in order to ensure that the calculation results will not affect the subsequent numerical simulation, the particle loading rate is calculated:…”