| In recent years,China's central and eastern regions have repeatedly appeared in a wide range of haze weather,Beijing is repeatedly encountered attacks.In addition to meteorological factors,frequent haze and air pollution is closely related to the increase of VOCs.The problem of regional atmospheric pollution is characterized by ozone,fine particulate matter(PM2.5)and acid rain.As an important precursor of ozone and secondary organic particulates,volatile organic compounds(VOCs)play an extremely important role in the process of atmospheric chemical reactions and are increasingly studied and concerned.At the end of 2012,China's first comprehensive air pollution control plan "key regional air pollution control" 12 th Five-Year Plan "(hereinafter referred to as" planning "),it is the first time to explicitly control volatile organic compounds(VOCs)."Planning" requirements to improve the volatile organic matter emission project construction requirements,to carry out key industry governance,improve the volatile organic matter pollution control system.The on-line monitoring technology of VOCs plays a vital role in carrying out management work.At present,the most commonly used monitoring methods,such as gas chromatography-mass spectrometry(GC-MS)and gas chromatography-infrared spectroscopy(GC-FTIR),have some limitations,such as complex system,large volume,can not be used in scene;In addition,the period is long,from the sampling to analyze,which affect the outcome of the timeliness and accuracy,can not reflect the pollution situation.Therefore,in addition to the existing means of conventional monitoring,there is an urgent need for a way to quickly and easily on-line monitoring of VOCs for fixed sources of pollution.Ion mobility spectrum(IMS)is a monitoring instrument that utilizes the mobility difference between ions in the electric field to realize the separation and analysis.In recent decades,the ion mobility spectrum has the advantages of fast monitoring and high sensitivity.Suitable for trace amounts of volatile organic compounds such as chemical warfare agents,drugs,explosives and air pollutants,and have been widely used in airport security and field exploration,and in petrochemicals,environmental monitoring,biomedicine,processes Control,air quality analysis and other aspects of access to applications.In this paper,firstly,FLUENT and SIMION simulation software are used to study study the factors affecting the performance of ion mobility spectrometry.The influence of environmental parameters(such as airflow,temperature,humidity,etc.)on the detection performance of the ion mobility spectrum VOCs detection technology is studied.And the numerical simulation results are verified by experiments and are used to further analyze the relationship between gas-phase ion and chemical analysis of molecular reactions.It is clear that the performance of the ion mobility spectrum can be adjusted to the optimum state as long as the environmental parameters are properly selected.Then,some research work has been carried out on the application of ion mobility spectroscopy in VOCs detection.The results show that the numerical simulation results are in good agreement with the experimental results,and the ion mobility spectroscopy can qualitatively detect the species of the mixture,which also shows that the ion mobility spectrometer In the application of VOCs has achieved good results.Finally,real-time on-line monitoring of VOCs has been studied to monitor a wide range of VOCs(volatile and semi-volatile),while the location of the leaks,the concentration of the sample gas and the type of data access monitoring Center,to achieve real-time monitoring of toxic and harmful gases,and to eliminate hidden dangers and save time to achieve the purpose of reducing the accident,but also for the optimal design of ion mobility spectrum provides a theoretical basis. |
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