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Experimental Study on the Ethylene/air Diffusion Flame Based on Near-infrared Emission Spectrometry Measurement

Author: ChenChen
Tutor: LouChun
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Ethylene diffusion flame Flame temperature Carbon black concentration Near Infrared Spectroscopy
CLC: TK16
Type: Master's thesis
Year: 2011
Downloads: 14
Quote: 0
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Abstract


Carbon black is produced by incomplete combustion of the fossil fuels , is not an effective use of the energy , direct emissions will lead to the reduction of the energy utilization efficiency , as well as the increase in atmospheric pollution . Soot particles has a significant impact on human health , environmental pollution, and industrial applications . Development combustion diagnostic techniques , the study of the formation of carbon black in the combustion process and the burnout process , as well as inspection of carbon black models are very necessary. Rebuild the flame temperature and the carbon black concentration distribution based on the flame spectral information processing technology has attracted widespread attention in recent years , based on the flame near-infrared band spectrum analysis processing is relatively rare . This paper introduces a method of reconstruction of flame temperature and carbon black concentration based on the flame near-infrared band spectral information . First the axisymmetric flame radiation spectrum model then describes the simultaneous inversion reconstruction flame temperature and carbon black concentration calculated from the flame detector intensity distribution according to Abel inversion ; Finally , given the default simulation , different wavelength range 900-1900nm ,1000-1700nm and 1200-1650nm for redevelopment , the temperature and the carbon black concentration distribution is consistent with the default value : reconstruction and different signal-to-noise ratio , SNR = 200 noise conditions can also be ideal reconstruction results . The experimental study, the axisymmetric flame object of ethylene carried out , in the experiment , the ethylene flow rate was 130ml/min, and the air flow rate of 200L/min . The detection of near-infrared spectrometer to obtain the flame five different height layer spectral radiation signal distribution . Series of data processing , the radiation intensity distribution according to the blackbody furnace calibration correction factor correction , and then filtered , polynomial fitting , such as symmetry Abel inversion from reconstruction flame level temperature and carbon black concentration distribution. , Close to the location of the center of the flame in the flame lower carbon black concentration distribution is close to zero , the carbon black concentration distribution peak flame Central (30mm height) , and then change with altitude layer to 40mm height , the carbon black concentration distribution starts to decrease . Reconstruction flame temperature range of 1500 ~ 1800K, the distribution range of the carbon black concentration of 0 ~ 4.5ppm, is basically the same and based on the detection result of the image processing .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Fuel and combustion
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