Understanding CDM Methodologies - SuSanA
Understanding CDM Methodologies - SuSanA
Understanding CDM Methodologies - SuSanA
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Box 27: Ensuring accuracy of measurements in secondary catalytic N 2<br />
O<br />
abatement projects<br />
Most complex<br />
Monitoring<br />
Procedure in <strong>CDM</strong><br />
AM0034 requires the utilization of the use of the European Norm EN 14181<br />
“Quality assurance for automated measuring systems”. Simply speaking the<br />
norm specifies a number of tests/calibrations that need to be performed on the<br />
monitoring equipment for N 2<br />
O concentration measurements in order to ensure<br />
data accuracy to the highest standard possible. First of all, EN 14181 requires the<br />
monitoring instruments to be used not to exceed pre-defined uncertainty ranges.<br />
If equipment fails the test, it may not be usable for baseline and project campaign<br />
measurements. This has led to the situation where project proponents needed<br />
to revise parts of their monitoring system installed in the process in order to<br />
comply with EN 14181. During the baseline campaign the installed measurement<br />
equipment needs to be calibrated with the so called “Standard Reference<br />
Method” by an independent testing laboratory to ensure reliable results of<br />
monitoring. This also needs to be done during the first project campaign. During<br />
project operation the monitoring system is subject to on-going quality assurance<br />
(to be performed continuously by the plant owner) and annual surveillance test<br />
(to be performed annually by an independent testing laboratory).<br />
Monitoring shall be conducted on the following items:<br />
Ex ante<br />
The following data needs to be gathered for the previous five complete<br />
campaigns before request for registration:<br />
• Oxidation temperature and pressure and its normal range<br />
• Ammonia to gas flow rates and ammonia to air ratio in the reactor<br />
• Gauze supplier and composition<br />
• Normal campaign length<br />
• Regulations on N 2<br />
O emission threshold, if any<br />
Baseline Data<br />
Requirements<br />
The following data needs to be gathered during the baseline campaign (see<br />
Box 28 for timing of baseline campaign):<br />
• N 2<br />
O concentration in the stack gas<br />
• Volume flow rate of the stack gas<br />
• Length of the baseline campaign<br />
• Nitric acid production<br />
• Oxidation temperature and pressure and its normal range<br />
• Ammonia to gas flow rates and ammonia to air ration in the reactor<br />
• Overall uncertainty of the monitoring system (combined uncertainty of all<br />
monitoring equipment)<br />
• Gauze supplier and composition<br />
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