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Fuel gas composition and properties determining method involves determining non-infrared-active nitrogen proportion of gases as difference of measured overall pressure of gas mixture and sum of determined partial pressure of gas component
Fuel gas composition and properties determining method involves determining non-infrared-active nitrogen proportion of gases as difference of measured overall pressure of gas mixture and sum of determined partial pressure of gas component
The gas composition is determined by using an optical system having a wide-band emitting infrared emitter (1-6 mu m) and narrow-band receivers, and measuring the infrared (IR) absorption of the gaseous fuel. The wavelength and spectral ranges of the receiver are selected such that the absorption portions of the individual IR-active components of the gaseous fuel in different proportions affect the measured ranges. The non IR-active oxygen portion of the gaseous fuel is measured with a lambda-probe. The heat value of the non IR-active hydrogen proportion in the gaseous fuel is determined by the difference between the total heat value measured with a calorimeter and the computed heat value of the optically measured IR-active gaseous fuel components. The hydrogen proportion is calculated by its heat value. The non IR-active nitrogen proportion of the gaseous fuel is determined as the difference of the measured total pressure of the gas mixture and the sum of the determined partial pressure of the other gas components. An independent claim is also included for a device of determining composition and properties of fuel gas.
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