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Improvement of Interlaboratory Reproducibility for NOx and CO Measurements

Objective

The aim of the research is to define precise measurement techniques for the determination of CO and NOx emissions from appliances burning fossil fuels and to improve the reproducibility of test results among European laboratories, which shall not exceed 15 % relative. (Actual reproducibility lies respectively about 40 % and 25 % for NOx and CO measurement). The research shall improve the CEN technical report CR 1404, which will be amended where needed, in particular to extend its scope to oil fixed appliances.
Measurement and calculation have been carried out to check the influence of the gas composition as well as the nitrogen content in fuel oil: The first results obtained indicate that qualitatively there is a good coincidence between the experimental figures and the model used for the calculation. It is now possible to predict the influence on emissions of gas or fuel oil composition and the corresponding correction formulas have been developed. Sampling has also been fully examined and figures are available on various influences such as sampling point in appliance in chimneys, material used etc. A protocol to measure the sampling line influence has been developed.

Experimental protocols to evaluate the errors due to the analyzers (CO, NOx) have been developed and practical tests have been carried out indicating the range of errors possible in a real situation. Calibration gas bottles from different suppliers are presently tested. Possible drift with time is being checked. This part is not yet finalized. Finally the analysis of the influence of repeatability has led to identification of new error sources.
A GLP document has been written and made available for an intercomparison presently on-going with three different samples (boilers). The GLP document includes details on how to check the measurement instruments and sampling line, the procedures for calibration and testing as well as the detailed method for the uncertainty calculation.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

DANISH GAS TECHNOLOGY CENTRE A/S
Address
5A,dr. Neergaardsvej 5A Naturgassens Hus
2970 Hoersholm
Denmark

Participants (13)

Association Royale des Gaziers Belges
Belgium
Address
125,Rodestraat
1630 Linkebeek
BG PLC
United Kingdom
Address
Ashby Road
LE11 3GR Loughborough - Leicestershire
CENTRE TECHNIQUE DES INDUSTRIES AERAULIQUES ET THERMIQUES
France
Address
Bd Du 11 Novembre 1918, 27-29
Villeurbanne
Dansk Teknologisk Institut
Denmark
Address
Gregersensvej
2630 Taastrup
Deutscher Verein des Gas- und Wasserfaches
Germany
Address

76128 Karlsruhe
Gastec NV
Netherlands
Address
50,Wilmersdorf
7327 AC Apeldoorn
Gaz de France
France
Address
361,Avenue Du Président Wilson
93211 La Plaine Saint-denis
INSTITUTO SUPERIOR TECNICO
Portugal
Address
1,Avenida Rovisco Pais 1
1049-001 Lisboa
NEDERLANDSE GASUNIE NV
Netherlands
Address
Energie Weg 17
9743 AN Groningen
Repsol Petróleo SA
Spain
Address
278-280,P De La Castellana
28046 Madrid
Ruhrgas AG
Germany
Address
Halterner Straße 125
46284 Dorsten
SP SWEDISH NATIONAL TESTING AND RESEARCH INSTITUTE
Sweden
Address
4,Brinellgatan 4-10
501 15 Boraas
SWISS FEDERAL LABORATORIES FOR MATERIALS TESTING AND RESEARCH
Switzerland
Address
Ueberlandstrasse 129
8600 Duebendorf