Vung Ang 1 Thermal Power Plant – AIG Tuning

AIG Tuning:

Chugai Technos, having gained the trust of the contractor Babcock & Wilcox Vietnam, successfully executed the task of adjusting the Ammonia Injection Grid (AIG) in the NOx reduction system (SCR) for Unit 2.

Utilizing a simple and easily assembled equipment system, the adjustment addressed the specific challenges of the sampling location (horizontal and vertical pipelines, difficult access points, confined spaces, sampling holes located outside the operating floor, and depths up to 7m). The monitoring equipment system adheres to the Japanese JIS standards.

Scope of Work:

  • Ammonia Injection Grid adjustment: Survey valve opening ratios, NOx distribution at the outlet; Adjust nozzle valve clusters; Confirm post-adjustment NOx and NH3 distribution leakage.
  • Monitoring and analyzing exhaust gas quality at the outlet of the water heater (Economizer) and SCR outlet.

Monitoring Parameters: Temperature, pressure, velocity, flow rate, humidity, gas composition (O2, CO2, and N2), NH3 leakage concentration; continuous NOx-O2 monitoring using gas analysis equipment.

Report Contents:

  • Valve opening ratios, NOx distribution coefficients before and after adjustment;
  • Basic exhaust gas parameters;
  • NOx-O2 concentration;
  • NOx reduction efficiency;
  • NH3 leakage concentration;
  • NH3/NOx mole ratio;
  • Distribution diagram: NOx-O2, NH3 concentrations;
  • Comparison of actual measurement results with DCS data;
  • Data analysis, overall evaluation, and improvement plan recommendations.

Chugai Technos team of engineers carried out the project under challenging nighttime operational conditions according to the Vung Ang 1 Thermal Power Plant operational schedule. Collaborating with highly experienced engineers and industry experts from Japan, Chugai Technos effectively utilized available resources to work closely with the client in developing the optimal solution, meeting real-world conditions, and contributing to the successful completion of the project on schedule.

Some pictures during the implementation of the project:

Measurement and sampling equipment system

Ammonia nozzle valve adjustment area

Continuous NOx-O2 monitoring

Valve adjustment location calculation

NH3 sampling

NH3 sampling equipment

NH3 sampling collection