Experience gained from the use of the ADA-900 photometric analyzer at sections for the production of elemental sulfur of the Copper Plant of the Arctic Division of the Norilsk Nikel Mining and MetallurgicalCompany is analyzed and generalized from the point of view of its reliability and correspondence to the frequency characteristics of the gas that is being diagnosed. A correlation comparison of the concentration of the sulfur-containing components of the process gas following the sulfur collector and a comparison with the data of chromatographic analysis have demonstrated the low reliability of the determination by the ADA-900 analyzer of the concentration of hydrogen sulfide and of the ratio [H 2 S/SO 2 ] in analyzed gas. Regular and independent calibration of the ADA-900 analyzer is required to achieve reliable monitoring of the Claus ratio in gases. Because of the dynamic characteristics of the sampling system and the optical vessel of the analyzer itself the ADA-900 analyzer may be used in a production process automatic control system TP only where there are no disturbances in the parameters of the process with periods less than ~10 min.Experience gained from the use of the automatic control system of the process of producing sulfur in the Claus plant (SRU) of the coke-oven gas desulfurization line at the Magnitogorsk Metallurgical Combine (MMK) has demonstrated significant time lag and low reliability of the readings of the control device, the ADA-900 spectrophotometric gas analyzer [1]. Let us consider these conclusions in light of other independent data, in particular, the experience gained from the use of the ADA-900 analyzer at an elemental sulfur production section of the Copper Plant of the Arctic Division of the Norilsk Nikel Mining and Metallurgical Company. These data were estimated from the point of view of their reliability and correspondence with the dynamic characteristics of the control gas.The frequency characteristics of the ADA-900 spectrophotometric gas analyzer, which is connected after the sulfur collector of an elemental sulfur production section, were estimated on the basis of records of the variations of the composition of the reducing gas generated by the gas analyzer. For this purpose, the form of the autocorrelation function of the variations in the concentration of sulfur dioxide [SO 2 ] ADA in the process gas (the component that is the most stably diagnosed by the analyzer) were determined from recording data taken at one minute intervals.The dynamic properties of the analyzer's sampling system were directly determined by a discrete sampling autocorrelation function for a finite time series of equidistant (with interval t = 1 min) readings of the concentration of sulfur dioxide:(1)where σ is the variance; τ = nΔt, n = 0, 1, 2, ..., m; m, number of individual time shifts; ƒ(1), ƒ(2), and ƒ(N), specified time R N m f t f t n N m ( ) ( ) ( ) ( ), τ σ τ = − − = − ∑ 1 2 2 1 2
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