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LOW-CONCENTRATION NOX EMISSIONS MEASUREMENT
Citation:
Clapsaddle, C., A. Trenholm, AND A. M. Marshall. LOW-CONCENTRATION NOX EMISSIONS MEASUREMENT. Presented at AWMA Annual Meeting, Orlando, Florida, 6/24-28/01.
Description:
The paper gives results of a recent series of low-concentration nitrogen oxides (NOx) emission measurements, made by Midwest Research Institute (MRI) during U.S. EPA-sponsored Environmental Technology Verification (ETV) test of a NOx control system called Xonon (TM) Cool Combustion. (NOTE: Some in industry question the capability of certain existing EPA Reference Methods to accurately and precisely make low-concentration emission measurements, noting that the methods were not developed for such low-concentration applications). The Cool Combustion system produced between 1 and 2 ppmv of NOx emissions. Because the cool Combustion system was installed on a gas turbine, EPA Method 20 was followed to measure the NOx and oxygen (O2) concentrations in the turbine exhaust. The measurement range for the Thermo Environmental Instruments (TEI) Model 42H NOx analyzer was 0 to 20 ppmv. All Method 20 quality control (QC) procedures were followed strictly. Test program results indicated that low-concentration NOx emission measurements can be made accurately. The paper details the test program and sampling system used to make the low-concentration NOx emission measurements. Results of the QC checks and the mean and 95% confidence interval of the mean of 12 test runs are reported.