Title: Real-time quality metering of propanated biomethane

Authors: Taras Koturbash; Agnieszka Bicz; Vladimir G. Kutcherov

Addresses: Department of Energy Technology, KTH Royal Institute of Technology, Brinellvägen 68, 10044 Stockholm, Sweden; GasQuaL AB (Ltd), Regementsgatan 29/1201, 17066, Solna, Sweden ' Optel Sp. z o.o. (Ltd), ul. Jerzego Kowalskiego 5, PL-52-428 Wroclaw, Poland ' Department of Energy Technology, KTH Royal Institute of Technology, Brinellvägen 68, 10044 Stockholm, Sweden; Department of Physics, Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russian Federation

Abstract: This paper presents a correlative method for the real-time measurement of quality characteristics of propanated biomethane for pipeline injection according to the European and Swedish regulations. The target quality properties (superior calorific value and Wobbe index) were predicted by the developed regression model based on the measurement of a selected set of physical properties of the gas samples. The measured physical properties are the thermal conductivity, the carbon dioxide concentration, the speed of sound, and the sound attenuation parameter measured as the ultrasonic signal dampening at 1 MHz. The empirical model of the sound attenuation parameter was developed for selected gases in order to predict a sufficient amount of data points for training the regression model. The developed regression model was tested experimentally and demonstrated good agreement with chromatographic analyses. [Received: July 1, 2019; Accepted: February 15, 2020]

Keywords: calorific value; Wobbe index; biomethane; propanated biomethane; ultrasonic measurement; speed of sound; ultrasound attenuation; correlative method; natural gas; time of flight; gas analysis.

DOI: 10.1504/IJOGCT.2021.114859

International Journal of Oil, Gas and Coal Technology, 2021 Vol.27 No.1, pp.78 - 94

Received: 01 Jul 2019
Accepted: 15 Feb 2020

Published online: 30 Apr 2021 *

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