Numerical Simulation of the Effect of Hydrogen Mixing on Combustion and Emission Characteristics of the Natural Gas Combustor
The combustion and emission characteristics of existing gas turbines using hydrogen-doped fuel were studied.Based on the DLN1.0 combustion chamber flame cylinder,the numerical simulation method was adopted to study the influence of different hydro-gen-doped ratios(a total of 7 operating conditions with volume fraction of H2 ranging from 0 to 30％)on the combustion process of natural gas mixture under the condition of constant thermal power and the same equivalent ratio.The distribution parameters of the flow field,temperature field and combustion product in a flame cylinder and their corresponding relationships were obtained.The results show that with the increase of hydrogen mixing ratio,the flame temperature rises,the combustion reaction zone expands,and the tem-perature distribution uniformity at the outlet of the flame tube becomes worse.Hydrogen mixing results in the change of local heat re-lease,which will lead to an increasing trend of NOx emission with the increase of the hydrogen mixing ratio.Both CO and CO2 emissions decrease significantly,while H2 O production increases significantly.At the same time,a proposed dilution combustion method was adopted to solve a series of problems caused by hydrogen mixing,the characteristics changes were studied after hydrogen mixing com-bustion under different equivalent ratios,and the best equivalent ratio was calculated under each hydrogen mixing ratio.The research results provide theoretical guidance for the subsequent application of hydrogen-doped combustion technology in industrial gas turbines.
natural gas mixed with hydrogendilution combustioncombustion performanceemission performance
NETL
NSTL
万方数据
