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US 12,687,496 B2Granted
Measuring instrument for determining the gross or net calorific value of a hydrocarbon-containing fuel gas
AssigneeSiemens Aktiengesellschaft
InventorsCamiel Heffels, Konstantin Harr
Life of this patent
Estimating the term…
Abstract
The gross or net calorific value of a hydrocarbon-containing fuel gas is determined by using a Raman photometer. A Raman radiation obtained following interaction of laser light with the fuel gas is limited by a bandpass filter to a wavenumber range of the C—H stretching vibrations of the hydrocarbons contained in the fuel gas around 2900 cm−1 and is supplied to a photomultiplier and integratively detected by the photomultiplier. The gross or net calorific value is determined from the output signal of the photomultiplier.
Claims17
A method, comprising:
- limiting a Raman radiation obtained as a result of an interaction of laser light with a hydrocarbon-containing fuel gas to a wavenumber range of C—H stretching vibrations of hydrocarbons around 2900 cm−1;
- supplying the limited Raman radiation to a first photomultiplier;
- integratively detecting the limited Raman radiation by the first photomultiplier;
- generating an output signal by the first photomultiplier in response to the integrative detection of the limited Raman radiation;
- determining a gross or net calorific value of the hydrocarbon-containing fuel gas from the output signal of the first photomultiplier;
- further limiting the Raman radiation;
- supplying the further limited Raman radiation to a second photomultiplier;
- integratively detecting the further limited Raman radiation by the second photomultiplier;
- generating an output signal by the second photomultiplier in response to the integrative detection of the further limited Raman radiation;
- and
- correcting the gross or net calorific value of the hydrocarbon-containing fuel gas determined from the output signal determined by the first photomultiplier with the output signal of the second photomultiplier.
8 more elements
A measuring instrument, comprising:
- a Raman photometer including a first bandpass filter configured to limit a Raman radiation obtained as a result of an interaction of laser light with a hydrocarbon-containing fuel gas to a wavenumber range of C—H stretching vibrations of hydrocarbons in the fuel gas around 2900 cm−1, and a first photomultiplier receiving the limited Raman radiation and generating an output signal commensurate with the limited Raman radiation;
- a second bandpass filter to further limit the Raman radiation;
- a second photomultiplier receiving the further limited Raman radiation and generating an output signal commensurate with the further limited Raman radiation;
- and
- an evaluation device configured to determine a gross or net calorific value of the hydrocarbon-containing fuel gas from the output signal of the first photomultiplier and to correct the gross or net calorific value of the hydrocarbon-containing fuel gas determined from the output signal of the first photomultiplier with the output signal of the second photomultiplier.
2 more elements
Dependencies are inferred from the claim text.