A Numerical Analysis Of Dry Running Gas Seal Face’s Gas Film And Its Experimental Study

Dry gas seal is non contacting mechanical seal. Although it is divided from themechanical seal and mechanical seal, it could still can reduce the wear, energy consumption,repair, what’s more it can reduce the amount of leakage. At the same time of improvingsafety performance at the same time, it can also improve the output. Therefore, it has beenrapid developing, and it has playing a very important role in the petrochemicalindustry.However,dry gas seal technology come from abroad, while the study in China is stillrelatively backward.What’s more,study on the dry gas sealing tend to be simulating on the drygas sealing on the software,which is more conducted than studying on the running teststudy.In this reason their is still a long way on the study of dry gas seal in China.Compared with the mechanical seal, dry gas seal structure did not changes much, thedynamic, static sealing ring size has been widened, and there are shallow grooves on the drygas seal fluid with certain shape such as spiral T shaped,herringbone and rectangular.Theexperiment in this paper is a about the spiral groove, research mainly on the affect ofgeometric parameter and working condition on the sealing effect.In this article we combines the experimental research and numerical simulation to studythe dry gas seal,and we adopted the double end integrated dry gas seal test rig in Xi’anPetroleum University. We chooses the static and dramatic seal ring whose geometricparameters are fixed, using nitrogen as the sealing medium, changes the speed and pressure,we study the affect of speed increasing and pressure increasing on the dry gas sealperformance.The test result shows that the pressure and power consumption increases as therotate speed and pressure increases,and the the seal ending opens gradually, film formingstably in the speed reaches2500rpm or so, at which time the friction torque of the minimum,then as the speed increases, because the gas viscosity force, friction torque increases.At the stage of numerical simulation, a three-dimensional geometric model of dry gasseal with SolidWorks, mesh model with Gambit, using Fluent under the specific conditions ofdry gas seal to conduct the numerical simulation and simulate the dry gas seal gas film face pressure, velocity distribution, and the dry gas system seal leakage parameters. Compare thesimulation results with experimental results and analyses the reason of error, obtain theoptimization parameters, the number of grooves should be between10and18,vortex angleshould be65-75degrees,groove length and dam length should be between0.4and0.55, so asto better guide the development of the dry gas seal technology.groove length width ratioshould be between0.4and0.7.Making best of these parameters would guide the developmentof dry gas seal technology better.