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NO, NO2 and O2 on the inlet to an SCR.
NOx and O2 on the inlet to an SCR.
The gas stream contains ammonia, nitrogen oxides and in some cases sulfur dioxide . The NOx analyzer is a UV diode array process analyzer. Measuring the complete spectrum of the stream continuously and instantaneously.
The full spectrum advantage
The figures below show the absorbance spectra of the DeNOx process stream components,. The absorbance features overlap, therefore, a full high resolution spectral analysis is essential. High accuracies at a relatively wide dynamic range can be achieved due to the sharp absorbance features of the DeNOx stream componentThe system uses an aspirator driven extractive sampling system with a heated umbilical sample line. The sample flows through the absorption cell and the oxygen sensor in series. Long sample lines are avoided, minimizing the normal sample losses associated with sample adhesion to interior tubing walls.
UV Absorbance spectra Specifications
Range: 0 – 100 ppm NOx
Alarm Contacts: Two (2)
Range: 0 - 25% Oxygen
Accuracy: + 2% of measured value, or + 0.1% O2, whichever is greater
Repeatability: + 1% of reading, or 0.1% absolute, whichever is greater
Response Time: Less than 4 seconds to 90% step change
Signal Outputs
4-20mADC, isolated for Raw O2
4-20 mADC, isolated, for Raw NOx
4-20 mADC, isolated, for NOx, corrected to 15% O2
Local Area Network, RS-232,
Power: 115VAC, 50/60 Hz
Process: SCR Inlet
Process Temp.: 800 ° F
Process Pressure:
supply: 29" of Water Column
Return: Ambient Air
NO
NO2
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