Downloaded from orbit.dtu.dk on: Dec 21 2017 Berøringsløs optisk måling af gassammensætning ved UV og IR spektroskopi Clausen Sønnik Publication date: 2008 Document Version Publisher's PDF also known as Version of record Link back to DTU Orbit Citation APA: Clausen S. 2008. Berøringsløs optisk måling af gassammensætning ved UV og IR spektroskopi [Sound/Visual production digital]. DaSTA/NoSTAC og IGAS temamøde om gasanalyse i praksis - fra ppm til procenter Risø DK 01/01/2008 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details and we will remove access to the work immediately and investigate your claim.
Berøringsløs optisk måling af gassammensætning ved UV og IR spektroskopi SONNIK.CLAUSEN@RISOE.DK
OPTICAL METHODS Gas temperature and composition Hot gas flow with dust Fast respons time Large range Fiber optics 1 -? process points Non-intrusive
ABSORPTION
Blackbody-kurverkurver MÅLT FTIR 10 μm 4 μm 2.5 μm 2 μm
Measurement Techniques FULL SCALE CCD / IR pictures e.g. high speed IR-camera FTIR emission spectroscopy 2-6 μm CO CO 2 H 2 O C x H y T gas T par flux UV transmittance spectroscopy 210-350 nm NO O 2 SO 2
CCD and IR pictures VIS IR IR
Th Pi i l Theory Principles S 40 ]T=1273 K 2.9 μm T S FOV IR 20 30 nce [W m -2 cm -1 ] μ T w T g 0 2000 4000 6000 8000 Wavenumbers 0 10 Radia. 1 1 w T L i c g T g T L i c g T m L τ ε + = 1 ~ 2 2 T L L b i c g T i c g T a ν α ε = = 3 w T L g T L w T L m L g T α =
Gas temperature 1.8.6.4.2 2% 4% and 8% CO 2 25 cm path at 800ºC 0 2000 2500 3000 3500 4000
IR gas analysis 25 20 15 10 Emission spectrum: GB: 816.9ºC ε=0.106 Blackbody curve at 836.0ºC 5 0 2000 2500 3000 3500 4000 4500 5000 5500 1 Transmittance spectrum CO 2 H 2 O CO C x H y.8.6.4.2 0 2000 2500 3000 3500 4000 4500 5000 5500
0.02 0.016 6 nov. 2003 CO Concentration ti 8000 CO mg/nm 3 0.012 0.008 0.004 6000 4000 2000 0 CO partial t tryk atm Riste vibration on/off 0 39600 43200 Tid s 1 0
FTIR flame measurements AVV2 April 2006 Wood flame
FTIR spectroscopy i Kedelvæg ii gas flow L FTIR PC a b c d e 395 250 Blackb ody.
Wood flame temperaturet
Wood flame gas conc.
Oil flame
Coal flame.8.6.4.2 1850 1900 1950 2000 2050 2100 2150 2200 Arbitrary / Arbitrary Overlay X-Zoom CURSOR File # 2 : BAA_17 Res=None AVERAGED = Multifile Subfiles T g T p CO CO 2 H 2 O
Hot gas cell Quartz Fiber 3-zone Furnace Gas Cell Heated gas line Quartz Fiber Water injection Gas Mixer Power Supply Data Logger FTIR MB155 Gas bottles Computer Temperature range: 23 C - 1600 C UV VIS IR FAR
Gas reference data 1 Measured 1% CO spectrum in hot gas cell at 1500ºC red.98.96.94.92 1900 1950 2000 2050 2100 Arbitrary / Arbitrary Overlay X-Zoom CURSOR File # 1 : FOLDET3 Res=None 1.8.6.4 10%.2 CO 2 at 1500ºC. Red curve: Hitemp Blue: measured 0 2000 2500 3000 3500 4000
UV spectroscopy py Strong Weak Non-contact multi-gas analyzer for important combustion gases O 2 NO SO 2. Interference from H 2O and CO 2 is a minor problem. UV and IR method can be combined for non- contact simultaneously and accurate measurement of gas temperature and gas composition O2 NO SO 2 CO CO 2 H 2 O HCl C x H y. Measuring time can in principle be few μs using pulsed UV source combined with fast and sensitive detector array peltier cooled. Quartz fibre optics can be used in applications. Short lifetime of UV source. Safety UV radiation eye and skin. SO 2 limits applications. Reduced throughput for long fibre >10 m. System stability requires great effort vibration ambient temperature dust. Aging of system optical components due UV radiation could be a problem. Path length limitations for some applications. More sensitive to soot and particles in gas compared with IR techniques High sensitivity NO and SO 2.
UV NO detection =215 nm absorption band: DT=DT rot ±50 o C Paper: In-situ Gas temperature measurements by UV-absorption spectroscopy
UV O 2 detection 2.5 2 1.5 1.5 200 205 210 215 220 225 230 235 240 Arbitrary / Arbitrary Stacked X-Zoom CURSOR File # 3 : F_1_1TR Res=None 21% O 2 at 400ºC red 700ºC cyan and 1000ºC green 53.33 cm path length
UV SO 2 detection 1.8.6.4.2 0 220 240 260 280 300 320 340 Arbitrary / Arbitrary Overlay Y-Zoom CURSOR File # 2 : C_2_1 Res=None Transmittance at 700ºC 53 3 cm path length Transmittance at 700 C 53.3 cm path length. Grey curve 1154 ppm SO 2 in N 2 and red 5000 ppm in N 2
Kontakt/spørgsmål: RISØ DTU SONNIK.CLAUSEN@RISOE.DK Tlf 20 81 45 23