Objective In order to the solve the problems that there is a lack of effective quality inspection sampling technology for small liquefied natural gas(LNG)stations,the existing portable LNG sampling technology lacks practical sampling applications,and the reliability needs further verification,a new type of portable LNG sampling device and technology,as well as a sampling reliability verification method are provided.Methods This study builds upon the theoretical framework of LNG phase diagram control.Through theoretical calculations,we have devised a portable LNG sampling apparatus featuring a vacuum-cooled probe and a vaporizer.This ensures that LNG remains in a supercooled state during the sampling process,subsequently undergoing complete vaporization upon entry into the vaporizer.Consequently,the representativeness of the LNG samples is guaranteed.Additionally,we have developed a point sampling device to facilitate comparative analyses with the portable LNG sampling method.By comparing the compositional analysis results of samples obtained from both methods,we have conducted a comprehensive study to verify the representativeness and reliability of the portable LNG sampling technique.Results Demonstration applications have been successfully carried out at LNG refueling stations and LNG plants.The outcomes of these practical tests have demonstrated remarkable consistency among the samples obtained through the use of the portable LNG sampling apparatus across eleven consecutive sampling attempts.The composition analysis results of the LNG liquid samples,obtained through two consecutive sampling attempts,have satisfied the reproducibility requirements outlined in GB/T 13610-2020 Analysis of natural gas composition-Gas chromatography.Furthermore,these results have aligned with the composition analysis findings of the samples obtained through the point sampling method.This indicates that the sampling process is genuinely representative.Conclusion The portable LNG sampling device and technique have achieved the expected sampling effect,and fulfilled the sampling requisites for quality inspection at small LNG stations.
small LNG stationsliquefied natural gassamplingportabilityquality inspection
国家科技期刊平台
NSTL
万方数据
