Application of spectral technology in flame measurement

doi:10.1007/s11708-013-0283-5

Front Energ

2014, Vol. 8

Issue (1) : 138-143 https://doi.org/10.1007/s11708-013-0283-5

RESEARCH ARTICLE

Application of spectral technology in flame measurement

Jiaxun LIU(

), Xiaoshu CAI, Zenghao ZHU, Huinan YANG

School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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Abstract

Spectral technology has become an important detection method due to its advantages such as non-intrusive measurement and on-line analysis. In this paper, two applications of spectral technology in thermal detection were proposed. First, a novel spectroscopic method based on Planck’s law for measurement of emissivity was introduced. The emissivity, obtained by comparing the radiation intensity of the blackbody which had the same temperature as the flame with the detected intensity of the flames, could be used for on-line measurements and had a relatively higher upper temperature limit. Then, a spectroscopic method for composition detection of blended fuels was proposed based on the emissivity measured. By comparing the spectra of blended fuels and single fuels, the ratio of single fuels of the blended fuel could be calculated. The measurement system proposed in this paper, which consists of a spectrometer and a computer, is very compact.

Keywords spectrum emissivity measurement component of fuel near-infrared spectrometer

Corresponding Author(s): LIU Jiaxun,Email:jiaxun.liu@163.com

Issue Date: 05 March 2014

Cite this article:

Jiaxun LIU,Xiaoshu CAI,Zenghao ZHU, et al. Application of spectral technology in flame measurement[J]. Front Energ, 2014, 8(1): 138-143.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-013-0283-5
https://academic.hep.com.cn/fie/EN/Y2014/V8/I1/138

Fig.1 Spectra detect apparatus

Fig.2 Spectra before and after correction
1—theoretical spectral curve of blackbody at 1100 oC; 2—spectra of blackbody at 1100 oC measured by the spectrometer; 3—spectra of blackbody at 1100 oC measured by the spectrometer after correction; 4—theoretical spectral curve of blackbody at 1250 oC; 5—spectra of blackbody at 1250 oC measured by the spectrometer; 6— spectra of blackbody at 1250 oC measured by the spectrometer after correction

Fig.3 Spectra of flames of coal, candle, butane and biomass. (a) Coal; (b) candle; (c) butane; (d) biomass

Fig.4 Spectra of flames and blackbody at the same temperature. (a) Coal; (b) candle; (c) butane; (d) biomass

Fig.5 Curve of emissivity of flames. (a) Coal; (b) candle; (c) butane; (d) biomass

Fig.6 Coefficient in dependence of wavelength

Fig.7 Relative spectra of different flames of different fuels

Tab.1 Calculated ratios of single fuels

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