In view of the measurement of flame temperature of municipal solid waste(MSW) incinerator

a portable fiber spectrometer was employed to collect flame spectra of a 35 t/h MSW incinerator. Firstly

the accuracy of the Gauss function

the Lorenz function and the combination of the two functions in extracting the characteristic lines was discussed

which shows that the combination function is the most accurate and the Lorenz function is the worst. Then

the application of atomic spectroscopy in temperature measurement was discussed

which shows that the method has great limitations due to the immature temperature theory. By using the method of nonlinear least squares method

the spectral baseline separated by a method based on polynomial fitting

the spectral curve after removal of the characteristic spectral line and the original spectral curve without processing were optimized to calculate the flame temperature

and it shows that the optimizing result of the flame spectrum of which the characteristic spectrum was directly removed is the most accurate. The analysis of seven samples spectra shows that the waste flame meets the gray body characteristics' requirements in the wavelength range of 650～900 nm.