Simulation reliability of accidental decompression characteristics released from carbon dioxide pipeline with OLGA software
A one-dimensional geometric model consistent with the experimental conditions was established using commercial software OLGA,based on the supercritical carbon dioxide accidental leakage experiments from DN 250,a 258 m long industrial scale pipeline performed previously.The materials,thickness,and thermos-dynamic properties of the pipe wall and insulation layer were set in the model.The leak boundary condition was applied to the model to simulate the carbon dioxide accidental leakage process.The properties of carbon dioxide calculated by the SRK-Peneloux equation were imported to the model by PVTsim 20 software.The unsteady calculation method was set to the model.The variations of pressures and temperatures at different locations in the pipeline were calculated at different relief diameters of 50 mm,100 mm,and 233 mm(full bore rupture).The reliability of OLGA simulation was explored by comparing the simulated results with experimental ones.The results show that,in all these three conditions at different relief diameters,the predicted duration time of leakage is nearly the same as the experimental values,indicating that OLGA simulation has good reliability in predicting the duration of leakage;At the onset of accidental release,the pressure sudden drop and rebound due to decompression wave propagation shown in experiments is not occurred in numerical results,indicating that OLGA simulation cannot predict the propagation behavior of pressure decompression waves.During the pressure decompression process with a leakage diameter of 233 mm,the simulated pressure drop and temperature drop are significantly different from the experimental results,indicating that OLGA simulation cannot be applied to predict pressure drop and temperature drop at full bore rupture condition;OLGA simulation can reproduce the pressure drop and temperature drop law of supercritical carbon dioxide leakage when the leakage technique is 50 mm and 100 mm to a certain extent,and can be applied to engineering occasions with low precision requirements.
safety engineeringsupercritical carbon dioxidepipelineleakage and decompressionOLGA software
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维普
