REALISATION OF A MASS FLOW MEASUREMENT DEVICE FOR A NEW REFERENCE GAS CALORIMETER
P. Ulbig, A. Benito, P. L. Cremonesi, J.-R. Filtz, R. Forster, F. Haloua, B. Hay, M. Jaeschke, S. Loubat, S. Sarge, P. Wenz
Abstract:
As to fossil energy sources, gas consumption has still the strongest growth rate and has more than doubled world-wide since 1973. In 1999, the production and consumption of gas amounted globally to 2,2 billions of cubic metres. According to estimates of the World Gas Association, gas consumption will increase by an annual rate of 2,3 % until 2030.
In view of the wid e growing global demand for natural gas and the liberalisation of the gas market in Europe, the measurement accuracy is of decisive importance when determining the calorific value to ensure transparency on the European gas market. At the moment, however, only a few research institutes all over the world are able to determine the calorific value of gases with an expanded measurement uncertainty < 0,2%. This applies not only to the determination of the calorific values of pure gases but also to the determination of the calorific value of synthetic and natural gas mixtures.
The reference values for the different components of natural gas as laid down in the standard ISO 6976 are based on measurements which were taken more than 50 years ago. From today's view, for example for the measurements of methane, an uncertainty of 0,12 % has to be assumed.
Therefore, a study by the project name "Feasibility study for the design of a reference calorimeter" was carried out by GERG (Groupe Européen de Recherches Gazières). Its purpose was to analyse from today's state of the art the possibility of determining the calorific value of gases with an expanded measurement uncertainty < 0,05 %. In this study, different ways to determine the calorific value of gases by calo rimetry were analysed. This meant in particular that different calorimeter systems were compared to one another by way of an uncertainty analysis. It could be shown that the aim to determine the calorific value with an expanded measurement uncertainty <0,05 % seems to be achieved best with the Rossini calorimeter. The suggestion developed in the feasibility study also included a list of the different components needed for the periphery of the Rossini calorimeter as shown in Fig. 1. In this paper, details of the Rossini calorimeter, and the mass resp. mass flow determination system, will be described.
Download:
IMEKO-TC9-2003-012.pdf
DOI:
-
Event details
IMEKO TC:
TC9
Event name:
FLOMEKO 2003
Title:
11th Conference on Flow Measurement
Place:
Groningen, NETHERLANDS
Time:
12 May 2003 - 14 May 2003
 Back