Study On Pollutant Diffusion And Laser Detection Of Oil Pipeline Leakagea

The oil industry is the blood of economic development,pipeline transportation is the main artery of the oil industry,maintaining the safe and stable operation of the transportation pipeline has become an important theme of the oil and gas industry.Human factors and natural factors can lead to leakage of oil pipelines,oil pipeline leakage not only affects the normal delivery,but also causes casualties and huge economic losses.Pipeline leak detection is a necessary means to ensure the safe and reliable operation of the pipeline.At present,the laser technology has potential application prospect in the detection of pollutant leakage on the pipeline of oil pipeline due to its non-contact and rapid measurement.However,the diffusion characteristics of pollutants and the optical properties of pollutants have a certain influence on its detection.Therefore,it is of great value to study the diffusion of pollutant in oil pipeline and its laser detection.In this paper,the leakage of pollutants and the spectral characteristics of leachate contaminants were studied by means of experimental and numerical simulations.The spectral characteristics of oil pollutants and the surface optics of soil characteristic were analyzed also in this way.On the basis of this,the influence of the leakage conditions on the diffusion of pollutants in the buried and water pipelines and the laser detection of oil pollutants were studied numerically.The experiment of soil infrared thermal imaging was carried out,and the influence of measurement conditions on the laser detection of oil pollutants was studied by setting up a laser test bench.The main research contents are as follows:1.Experimental media spectral measurement experiment.The optical constant of oil is obtained by the ―double thickness‖ method,and the refractive index is between 1.814 and 1.901.The absorption index is between 0.0261 and 0.0488,Combining with the existing water optical constant of public literature data,the water reflection ratio is 0.036,which can obtain the ground reflection characteristics of oily wastewater.2.Two-dimensional calculation model of mass transfer process of pollutant leakage in oil pipeline was established.The influence of the leakage condition on the diffusion of oil pollutants in the buried and water pipelines was simulated by FLUENT software.The optical characteristics of the pollutants in the surface and surface oil were analyzed.Leakage diameter,leakage location and leakage rate have a greater impact on the spread of leakage of pollutants,oil density,viscosity and moisture content of the impact is relatively small.Laser detection is closely related to oil content and oil film thickness.The greater the surface oil content and the oil film thickness,the greater the intensity of laser detection.The longer the water spill is spread to the same location,the wider the detectable area is.3.Soil infrared thermal imaging experiment and laser detection of oil contaminants.The influence of solar irradiation time and oil content on the infrared properties of oil-bearing soils was analyzed.The infrared reflectance experiment of oil-bearing soil was carried out.The optical properties of surface oil pollutants were measured,and the influence of laser angle of incidence and measurement distance on its detection were analyzed.The laser angle increases,and the intensity of diffuse laser light is reduced.Through the research of this paper,the infrared spectral characteristics of oil and oily wastewater and the law of the leakage and diffusion of buried and water pipelines are obtained,and the influence of laser angle and distance on the laser detection of oil pollutants is studied,providing a certain basis for reference.