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1. (WO2018177651) METHOD FOR DETERMINING THE METHANE INDEX OF A HYDROCARBON-CONTAINING COMBUSTION GAS MIXTURE

Pub. No.:    WO/2018/177651    International Application No.:    PCT/EP2018/053826
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Feb 16 00:59:59 CET 2018
IPC: G01N 33/22
F02D 19/02
F02D 35/02
Applicants: ENDRESS+HAUSER FLOWTEC AG
TRUEDYNE SENSORS AG
Inventors: HUBER, Christof
REITH, Patrick
BADARLIS, Anastasios
Title: METHOD FOR DETERMINING THE METHANE INDEX OF A HYDROCARBON-CONTAINING COMBUSTION GAS MIXTURE
Abstract:
The invention relates to a method (100) for determining the methane index of a hydrocarbon-containing combustion gas mixture which has natural gas or biogas in particular, having the steps: allowing the combustion gas mixture to flow through a measuring assembly; determining a first measurement value (110) of a first measurement variable which is based on the viscosity of the flowing combustion gas mixture; determining a second measurement value (110) of a second measurement variable which is based on the density of the flowing combustion gas mixture; determining a pressure measurement value (110) of the flowing combustion gas mixture, said measurement value belonging to the first measurement value and the second measurement value, and determining (110) a temperature measurement value of the flowing combustion gas mixture, said temperature measurement value belonging to the first measurement value and the second measurement value; and determining the methane index (190) as a function of the first measurement value, the second measurement value, the pressure measurement value, and the temperature measurement value.