| Since China proposed the goal of carbon peak and carbon neutrality in 2020,gas turbines have been widely used as an emerging complete set of power machinery equipment using clean energy.Intake quality is an important factor affecting the operation of gas turbine.Pulse cleaning technology ensures the continuous and efficient operation of dust collector in gas turbine intake system.However,the cylindrical pleated filter cartridge mainly used in the current cartridge filter has the problem of insufficient upper cleaning.The conical pleated filter cartridge increases its upper cleaning area,which can effectively solve the above problems and has been gradually applied in recent years.At present,there are few studies on the cleaning performance of conical filter cartridge.This paper uses numerical simulation to study the pulse cleaning process of conical filter cartridges and to investigate the factors affecting the cleaning effect of conical filter cartridges.The cleaning performance of the conical filter cartridge is improved.Based on the findings,a link between the working conditions of the conical filter cartridge and the cleaning performance is established.A platform is built for the movement of the flow field of the conical cartridge pulse cleaning.The conclusions of this paper can provide a reference for optimising the effect of pulse cleaning of conical cartridges and improving the efficiency of gas turbine inlet filtration systems.The main contents are as follows:(1)A numerical model of the conical filter cartridge pulse cleaning system was established and the pressure distribution law inside the conical filter cartridge was derived.The reliability of the numerical simulation results was verified by comparing the simulation data of the numerical model with the experimental data.(2)Through numerical simulations,it was found that the blowing intensity using conical cartridges was better than cylindrical cartridges under normal nozzle conditions,but the blowing uniformity needed to be improved.The effect of blowing pressure and blowing distance on the cleaning effect of conical filter cartridges was studied and the results showed that: Increasing the blowing pressure increased the cleaning strength,but had less impact on the uniformity of the cleaning.Increasing the blowing distance,the cleaning intensity showed a trend of rising and then falling,and the uniformity of cleaning was improved.(3)The upper open scattering nozzle was installed below the normal nozzle to improve pulse cleaning in combination with the conical filter cartridge.Numerical simulation results showed that the nozzle’s deflecting effect on the airflow increases the uniformity of ash removal by a factor of nearly two compared to a combination without a scattering nozzle.Then studied the scattering nozzle structure and nozzle installation position on the conical cartridge cleaning effect,the results showed that: when the upper diameter of the scattering nozzle d = 16 mm cleaning effect is optimal;when the scattering nozzle was installed in the cartridge inlet parallel,not only to ensure the cleaning strength,but also to take into account the uniformity of cleaning ash.When the blowing pressure p=0.5MPa,the blowing distance h=250mm,the scattering nozzle d=16mm and the installation height H=300mm,the conical filter cartridge cleaning effect could be optimized to the greatest extent.(4)Using Microsoft Visual Studio 2019 as a development tool,a conical cartridge pulse cleaning flow field motion platform was built.The pressure cloud module,the velocity flow chart module and the conical cartridge pulse cleaning module were embedded to visualize the conical cartridge pulse cleaning performance in the monitoring system. |
