Study on the determination of particulate matter in coal-fired power plants

There are three kinds of particulate matter discharged from coal-fired power plant: filterable particles( include PM2.5),condensable particulates and soluble salt,and the domestic research on its testing method is still weak.In this paper,the determination methods of three kinds particles were researched,the determination methods and control points of particulate matter were pointedly put forward,and the field measurement and verification were carried out respectively.With high precision test instrument and blank test,the results of filterable particulate matter determination can be guaranteed to have high accuracy.The PM2.5 test results of charge method( ELPI) and gravimetric method( PM-10) are consistent with each other.The 2-stage condensing coil and isopropyl alcohol absorption can achieve the efficient capture of SO_3,and the SO_3 absorbed by the second stage coil and isopropanol can reach up to 40%.The method is recommended for low concentration tests.When the sampling gun is heated to a temperature of 160 ℃,the actual particle concentration measured by the filter membrane is filterable particles and soluble salt.