Measurement method of liquid drop concentration in natural gas pipeline based on microwave resonance principle
Detecting impurities of droplets in natural gas pipelines is challenging,and conventional off-line detection methods suffer from serious lag.In response,a two-parameter on-line measurement method of droplet concentration based on microwave resonance principle was studied.The simulation model of microwave resonance measurement sensor was established by COMSOL numerical simulation.Through parametric scanning,it is determined that with the diameter of the resonant probe RC of 6mm,the maximum electric field intensity in the center area of the measurement pipeline could reach 14100V/m,and the average current density javg(x)was 1015.48.The maximum current density deviation Imax(x)was 0.95,indicating that the microwave resonant measurement sensor has reached the optimal structure parameter.The influence of droplet concentration changes on the microwave resonance measurement system was also studied.Experimental results showed that the method aligned well with the off-line weighing method.The shift of resonant frequency and the effective increment of response amplitude of the sensor were sensitive to the change of droplet concentration and showed a linear correlation trend.The repetition rate of the sensor fluctuated around 0.25%,demonstrating the good stability of the microwave resonance method.This research provides a new perspective and guidance for the on-line measurement of droplet concentrations in high pressure natural gas pipelines.
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