Numerical Simulation Study on Hydrogen-mixing Combustion Characteristics of Natural Gas Tower Coaxial Graded Combustor
In order to understand the effect of hydrogen-mixing of natural gas on the performance of lean premixed gas turbines,Chemkin-pro was used to study the chemical reaction kinetic characteristics of fuel,and the adiabatic flame temperature,laminar flame propagation velocity and ignition delay time under different equivalent ratios and hydrogen-mixing ratios were compared.The results show that hydrogen-mixing can shorten the ignition delay time of fuel,increase the adiabatic flame temperature and flame propagation speed.Further,the effects of hydrogen-mixing ratio on combustion field distribution,combustion efficiency,total pressure loss coefficient,outlet temperature distribution factor,carbon monoxide and nitrogen oxide emission were studied.The results show that with the increase of hydrogen-mixing ratio,the combustion efficiency increased,the total pressure loss coefficient increased,the outlet temperature distribution factor decreased,the carbon monoxide emission decreased,and the nitrogen oxide emission increased.Combustion chamber tempering occurd when hydrogen-mixing ratio is 35%.In the range of 30%-35%hydrogen-mixing,the performance parameters of the combustor changed greatly.The total pressure loss coefficient increased by 24.74%,the outlet temperature distribution factor decreased by 31.11%,and the nitrogen oxide emission increased by 416.12%.
gas turbinehydrogen-mixing ratiokinetic properties of chemical reactionflashbackcombustion fieldcombustor performance
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