Design and Analysis of LNG Elevated Flare Derrick and Vent Stack
For purpose of making LNG elevated flare derrick and vent stack 115.5 m in height comply with the strength and stability requirements,having STAAD.Pro software adopted to establish their 3D numerical model was implemented,including analyzing their internal forces,deformation and the vent stack's vibration characteristics under the wind load,earthquake load and the temperature load.The calculation results show that,their strength and stability comply with the code requirements under basic load and combined working conditions;and meanwhile,their Reynolds number corresponding to the first 10-order vibration modes stays within a subcritical range,this indicates that the LNG elevated flare derrick will produce vortex-excited res-onance and the solutions to it should be presented.In addition,ANSYS was adopted to analyze the flare derrick's third segment where the maximum combined stress node exists.The results show that,the maxi-mum equal effect force point exists at the root of the connection point between the torch derrick pillar and the crossbar(σmax=286.09 MPa).This value is less than the tensile strength of the material and indicates that the node has sufficient bearing capacity.
flare derrickvent stackSTAAD.Probasic loadvortex-excited resonancefinite element anal-ysis
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