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Abstract

The invention relates to a method for determining the gas quality of a sample gas mixed at least in part with biogas, having the main components CH₄, CO₂, N₂, O₂, H₂, proceeding from a spectrum of the sample gas determined by means of infrared-spectroscopy measurement methods, under operating conditions, from which the mole ratios of the sample gas are determined by means of correlative methods, and converted to characteristic variables of the gas quality. In this connection, the optical absorption of methane CH₄ and carbon dioxide CO₂ and the heat conductivity λ of the sample gas are measured, the mole ratio xCH₄ is determined from the absorption of the CH₄, the mole ratio xCO₂ is determined from the absorption of the CO₂, the mole ratios of nitrogen xN₂, of oxygen xO₂ and of hydrogen xH₂ that are not detected optically are determined from the mole ratios xCH₄, xCO₂ and the heat conductivity λ, by means of a correlation calculation λ=F(xCH₄,xCO₂,xN₂,xO₂,xH₂), whereupon characteristic parameters of the sample gas are calculated from the mole ratios obtained in this way.

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First Claim