基于微射线切向扫描的流体诱导腐蚀异常在线监测OA北大核心CSTPCD

With the improvement of material selection in oil and petrochemical equipment,corrosion caused by mismatches between materials and the environment is increasingly under control.However,corrosion induced by changes in fluid velocity and flow regimes has become more serious,especially the risk of corrosion leakage caused by slug flow and annular mist flow.In this paper,a micro-beam tangential flow monitoring method is proposed for the online detection of such corrosion.This method utilizes the V-shaped signals at the interface of different materials to identify material boundaries.It can also detect density variations within the medium through slope changes in the signal curve at the ridge of the boundary layer.For slug flows,the slope of the signal curve exhibits periodic variations,while for annular-mist flows,the density signal decreases to a constant value near the inner wall of the pipes.Based on these characteristics,slug and annular-mist flows can be identified.This method increases the theoretical sensitivity by 5 to 10 times for petrochemical pipelines due to the tangential measurement method,which in turn reduces the dose of the radiation source by 1 000 times and the safety distance from 10 m to less than 1 m for industrial CT while maintaining the same sensitivity,thus meeting the requirements for the use of online monitoring systems in the petrochemical industry.