Flue Gas Analysis Based on Recursive Iteration Algorithm

The key point of flue gas spectra analysis is how to separate and calculate the concentration of different kinds of gas, which is from continuous mixed gas absorption spectrum signal. In this paper, a new iteration of the recursive algorithm is put forward on the basis of Lambert-Beer's law. This algorithm, using the superposition of the absorbance, achieves data nonlinear fitting. It takes the advantages of the wavelength optimum and the circular iteration to distinguish the gas mixture of different composition. Experimental results show that this method can calculate a variety of harmful gas concentration immediately, and the accuracy is up to ± 2%. In addition, this algorithm could be used to measure the concentration of many kinds of gases at one time, and it obtains strong anti-jamming capability which is suitable for practical application of engineering.