Filtration Performance Of Air Filter Elements For Intake System Of Gas Turbine Under Wet Conditions

In coastal areas,gas turbines operate in a high humidity environment for a long time,resulting in a significant decrease in the performance of the air intake filtration system,which seriously affects the safe operation of gas turbines.In order to explore the influence of factors such as humidity and water mist concentration on the filtration performance of the filter media,the filter media with four different fiber components was experimentally studied by using the filter material moisture resistance test device.According to the results of the change of filter media efficiency,pressure drop and dust capacity under different test conditions,the interaction relationship between the hydrophilicity and filtration performance of the filter media is revealed,and the reasons for the influence of humidity on the morphology of the dust layer on the surface of the filter media are analyzed in detail.The main findings are as follows:When the relative humidity in the experimental system increased from 50% to 100%,the pressure drop and dust holding capacity of each filter media increased,with an average growth rate of 9.8% and 12.6%,respectively.With the increase of hydrophilicity of the filter media,the pressure drop and dust capacity increase become more and more obvious.When the relative humidity reaches 70%,the dust layer on the surface of the filter media used in the experiment has the phenomenon of agglomeration and agglomeration,which makes the dust capacity increase the most,and the highest growth rate can reach 13%.In the case of different water mist concentrations,the filtration efficiency of weak hydrophilic filter media is not affected,but the filtration efficiency of strong hydrophilic filter media shows a significant downward trend with the increase of water mist concentration.When the water mist concentration is 92 g/m~3,the efficiency of the strongly hydrophilic filter media can be reduced by up to 43%.For different filter media pressure drop,the growth rate increases significantly with the increase of water mist concentration,and as the hydrophilicity of the filter media increases,the longer the filter media returns from the terminated wetting state to the approximate initial drying state.Under experimental conditions,the recovery time of strong hydrophilic filter media can reach 5times that of weak hydrophilic filter media,which means that under actual working conditions,strong hydrophilic filter media is more likely to be in a higher resistance state.The results of infiltration of different hydrophilic filter media showed that with the increase of the degree of infiltration,the quality factors of each filter media decreased,and the decline of strong hydrophilic filter media was more significant,with the maximum decrease of 54%.At the same time,the agglomeration and agglomeration of the dust layer on the surface of the filter media became more and more obvious with the increase of the degree of infiltration.The results of this thesis can provide guidance for the development of air filters for gas turbines in coastal areas.