Ammonia Slip Online Monitoring System NH3 CEMS Laser Gas Analyzer

In the SCR/SNCR denitrification processes of coal-fired boilers in thermal power plants and heating plants, it is necessary to conduct real-time online monitoring of NH3 slip. The monitoring results can guide the optimization of the injection amount of reducing agent ammonia to improve denitrification efficiency. At the same time, effectively controlling NH3 slip reduces the formation of ammonium salts, prevents corrosion and damage to downstream equipment, extends catalyst life, and saves operational costs.

The SCR/SNCR denitrification processes mostly adopt the high-temperature ammonia reduction principle, which determines the high-temperature, high-dust measurement environment for slip NH3. The non-contact measurement and spectral characteristics of ultraviolet absorption spectroscopy make it the best method for measuring slip NH3. Traditional slip NH3 analyzers use an in-situ (In-situ) measurement structure, which is complex to install and maintain. In practical applications, it is greatly affected by the limitations of flue gas duct size and conditions, and the test results cannot meet the accuracy and reliability requirements for monitoring slip NH3 in denitrification processes.

The AG-NH07 Laser Ammonia Slip Online Monitoring System adopts high-temperature heated extraction technology, effectively solving the sampling loss problem of slip NH3. It features high sensitivity, fast response, no interference from background gases, and non-contact optical measurement, capable of accurately reflecting changes in slip ammonia in real time.

Tunable Diode Laser Absorption Spectroscopy (TDLAS) is essentially a spectral absorption analysis technology that utilizes the selective absorption characteristics of gas molecules to specific wavelength lasers to obtain gas concentration. The difference from traditional spectral absorption technologies lies in the fact that the spectral width of semiconductor lasers is much smaller than the broadening of gas absorption lines. Therefore, semiconductor laser absorption spectroscopy technology is a high-resolution spectral absorption technology.

>>Product Features‌

● Adopts a hot and wet sampling method, is not limited by on-site installation conditions, has wide applicability, and is simple to use and maintain.

● Employs the high-resolution spectral technology of TDLAS, is not interfered with by other gases during measurement, and can effectively reduce interference from dust and background gases, which is a clear advantage compared to other analysis methods.

● Uses the second harmonic principle, achieving high resolution under the same optical path conditions, enabling ultra-low concentration NH3 measurement.

● Uses multi-line scanning technology to effectively lock the absorption peak position, reduce background interference, and improve test signal-to-noise ratio and sensitivity.

>>‌In-Situ Extraction AG-NH07 Ammonia Slip Monitoring System

The in-situ extraction system integrates the high-temperature sampling probe and high-temperature detection cell, directly installed on the flue gas duct. The flue gas is extracted and directly enters the high-temperature detection cell for analysis before being exhausted. By eliminating the sampling pipeline and gas transmission process in traditional extraction systems, the sampling loss of flue gas is minimized. This system is closest in form to the in-situ (In-situ) measurement method, overcoming the installation limitations of the in-situ method while the integrated high-temperature detection cell improves measurement sensitivity and enables online calibration, ensuring high precision and reliability in monitoring slip NH3. The in-situ extraction system has a smaller installation footprint and can achieve on-site multi-point measurement.

Directly installed on the flue gas duct, it includes the following built-in conditions:

●  Flue gas sampling and filtration system (high-temperature sampling and ultra-fine filtration technology);

●  Filter back-blowing system (analyzer set back-blowing frequency);

●  Multiple reflection optical detection cell (≥10m optical path, detection sensitivity ≥0.2ppm);

●  Temperature control system (gas contact parts heated to above 200°C to prevent ABS formation).

>>Main technical parameters