Research on DeNOx Combustion Performance of Humidified Natural Gas with H2 Blending in Gas Turbine
In order to understand the performance changes and allowable humidifying range of natural gas blended with hydrogen in a lean premixed combustor,and to solve the problem of NOx emissions excee-ding the standard in hydrogen blended gas turbine,taking a gas turbine combustor as research object,the influence of blending hydrogen ratio and humidification ratio on its combustion performance and pollutant emissions characteristics was numerically studied.The results show that under the condition of no humidi-fication of the fuel,the CO and CO2 emissions from the combustor outlet drop with the increase of hydro-gen blending ratio.However,thermal NOx emissions will increase because of higher combustion tempera-ture.When the hydrogen blending ratio reaches above 0.2,NOx emissions exceed the environmental pro-tection limiting value;under fuel humidification conditions,the average gas outlet velocity and H2O mass fraction increase,and the global temperature decreases together with the emissions of CO2 and NOx in the combustor,whereas the CO emissions decrease first and then increase with the increment of humidifica-tion ratio;humidified natural gas with H2 blending can achieve deNOx combustion,but the amount of wa-ter vapor humidification ought to be moderate considering the following issues,such as the power output efficiency of gas turbine under low hydrogen blending ratio conditions and the deterioration of combustion performance under high hydrogen blending ratio conditions.The recommended fuel humidification ratio is 0.463 when the hydrogen blending ratio is 0.3.
gas turbinehydrogen blendingnumerical simulationhumidified combustionpollutant emissions
万方数据
维普
