催化排放气体中含量检测方案

智能文字提取功能测试中

High Flow Gas Cell Infrared Spectral Analysis 5 Hz Catalytic Emissions FT-IR Monitoringduring Lean-Rich Engine Cycles：Comparison to Reference Methods 8mksTechnology for Productivity POWER & REACTIVE GAS · VACUUM TECHNOLOGY·FLEAK DETECTION·FLOW MEASUREMENT & CONTROIPRESSURE MEASUREMENT &CONTROL·CONTROL 8CONTROL 8 INFORMATION TECHNOLOGY·WAFER MECALIBRATION ·INTEGRATED SUBSYSTEMS·MEDICALGAS ANALYSIS·BIOPHARMECEUTICAL·POWER 8 REREACTIVE GAS·VACUUMTECHNOLOGY·LEAK DETEIFLOW MEASUREMENT & CONTROL·PRESSURE MEASGAS ANALYSIS·CONTROL INFORMATION TECHNOLINTEGRATED SUBSYSTEMS·CALIBRATION·POWER 8BIOPHARMECEUTICAL·VACUUM TECHNOLOGY·LEAIPRESSURE MEASUREMENT8 CONTROL·FLOW MEASCONTROL& INFORMATION TECHNOLOGY·WAFER MECALIBRATION ·INTEGRATED SUBSYSTEMS·MEDICALGAS ANALYSIS·BIOPHARMECEUTICAL·POWER& REREACTIVE GAS ·VACUUM TECHNOLOGY·LEAK DETEIFLOW MEASUREMENT 8 CONTROL·PRESSURE MEASGAS ANALYSIS·CONTROL & INFORMATION TECHNOLINTEGRATED SUBSYSTEMS·CALIBRATION·POWER 8REACTIVE GAS ·VACUUM TECHNOLOGY·LEAK DETE Martin L. Spartz and John Lake MKS Instruments， 651 Lowell StreetMethuen， MA 06029 Background Issues FRun FT-IR fast enough at high resolution Increase mirror speed Measure interferogram in both direction High enough SNR to provide sub 1 ppm detection limitsImprove detector sensitivity High enough flow rate to turn sample over in gas cell Modify plumbing to handle flow Prevent“whistling”and back pressure in gas cell RRun analysis fast enough to keep up with data collectionNeed really fast computer .Watch Lean-Rich cycles from Low NOx trap Provide quality analysis in real-time (with correct timing) Observe standard and non standard emission gases 8mks White Cell Design-High throughput-Better signal to noise ·Ease of maintenance ·Long path length- 5.11m 忙 ·Low volume 200 mL -Faster sampling Instrumental Configuration FTIR Analyzer 0.5 cm-1 Resolution 一7.4 um LN， cooled MCT 0.5 mm 5.11 m Gas Cell Modified to % inch plumbing 0.2 sec / measurement (single scan) 100 L/min Flow Rate (1 inch heated sampling line) 一150 C Gas Temperature 1.0 atm Gas Pressure -IDual Xeon Server for data collection & processing omks Wavenumber (cm") Measures Gases of Interest for Combustion Applications Speciation of Gas Stream during Cycle8mks Combustion Spectra 8mks SAMPLE CH4 Low [PF] cosirCOLOW PPM cosil，CO MID PPM cosinCO% HIGH cosineCO2% [PF]2 cosineH20% cosine 150CN20 [PF]2 cosine NH3 [PF] cosine 15. ResidualSpectra Series of Lean-Rich Cycles on Lean Nox TrapTransient Detection with 5 Hz FT-IR 12：57：36 12：58：19 12：59：02 12：59：46 13：00：29 13：01：12 13：01：55 13：02：38 13：03：22 Time (min：sec：msec) Transient Detection with 5 Hz FT-IR4 Min Window Time Lean - Rich LNT Transient Detection with 5 Hz FT-IR10 Second Window Time 8mks Comparison of CO & CO IR and Traditional Emissions Bench NOx Comparison+NH and N2015 Second Window N2O NO NO2 NOxppm Em BenchNH3 2nd Axis 8mks Concluding Remarks Demonstrated true 5 Hz Monitoring with FT-IR No pressure or temperature issues No timing issues Data compared well with Horiba MEXA system Able to monitor standard gases (CO， CO，， NOx， SOx)- Lean to rich with single method Able to monitor additional gases (N2O， NH3， CH4)-IProvide additional information for development LNT Expandable to additional gases -Speciate hydrocarbons (C2H2，C2H4，C2H6，C3Hg，etc)