Duyen Hai 1 Thermal Power Plant – AIG Tuning, SCR Performance Test – Unit S2

Ammonia Injection Grid (AIG) Adjustment and SCR De-NOx System Performance Test:

  • Receiving the trust of the National Research Institute of Mechanical Engineering (NARIME), Chugai Technos successfully carried out the task of adjusting the Ammonia Injection Grid (AIG) and performance test for Selective Catalytic Reduction (SCR) system for Unit S2.
  • Using a simple and easily assembled equipment system capable of accommodating both horizontal and vertical pipelines, even in challenging and confined spaces, the monitoring equipment adheres to the Japanese Industrial Standards (JIS).
  • Scope of Work:
    • Adjustment of Ammonia Injection Grid (AIG): Survey of valve opening rate, NOx distribution at the outlet; Adjustment of the injection valves; Confirmation of NOx and NH3 distribution after adjustment.
    • SCR Performance test: Emission monitoring, pressure differential measurement, ammonia consumption survey.
  • Monitoring Parameters: Temperature, pressure, velocity, flow rate, moisture content, gas composition (O2, CO2 and N2), concentrations of SO2, SO3, NH3; continuous monitoring of NOx/O2 using gas analyzer.
  • Report Content:
    • Valve opening ratios, NOx distribution coefficients before and after adjustment;
    • Basic exhaust gas parameters;
    • NOx/O2 concentrations;
    • NOx removal efficiency;
    • NH3 slip concentration;
    • NH3/NOx mole ratio;
    • SO2 conversion ratio;
    • Distribution diagrams: flow velocity, temperature, NOx/O2, NH3 concentration;
    • Comparison of actual measurements with DCS data;
    • Data analysis, comprehensive evaluation, and proposal for improvement.
  • Chugai Technos engineering team carried out the project under challenging nighttime operating conditions, aligning with the operational schedule of Duyen Hai 1 Thermal Power Plant. With the support of highly experienced Japanese experts, Chugai Technos effectively utilized available resources to collaboratively develop the most optimal plan, meeting actual conditions and ensuring the successful completion of the project on schedule.

 Some pictures during the implementation of the project:

Adjusting the NH3 injection valve

NOx-O2 continuous monitoring 

On-site analysis

Monitoring exhaust gas temperature and pressure

Moisture content monitoring

SO3 sampling