The DeNOx process must be controlled for optimization with a dual goal: (1) reduction of 35-75% of the NOx contents; and (2) limit excess ammonia to its minimum.

Another goal of monitoring NH3 for optimization of the DeNOx process is to minimize the amount of corrosive chemicals present in the emission (which could lead to early degradation of the smokestacks).

The control point for this measurement must be located as close as possible to the ammonia injection point, beforethe ammonia has time to chemically recombine with other elements. This measurement must be very short, very sensitive, without interference (cross response) and very precise. Moreover, lowered installation and maintenance requirements are desired.

The Proceas DeNOx, based on the patented OFCEAS (Optical Feedback Cavity Enhanced Absorption Spectroscopy) technology coupled to the patented low pressure sampling technology enables the measurement of NH3 in smokestacks for DeNOx process monitoring

Measurement of ammonia under these conditions:

- is reliable;

- is very low maintenance;

- is insensitive to cross response phenomena (despite the very wide scale of concentrations measured, from ppm's for H2S to 10's of % for CH4 and CO2);

- has very low levels of detection;

- has response times measured in seconds;

- has a wide dynamic concentration range (e.g. H2S 0.5% at the beginning of the process to less than 10 ppm at the end of the process);

does not experience instrumental response drift (self-standardization);

- does not require regularly schedule re-calibration (self-calibrating direct measurement);

- does not require sample conditioning;

- is a laser spectrometer capable of multi-components analysis.

The Proceas DeNOx is available in two configurations: (1) NH3 only; and (2) NH3 and NO.

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