Duyen Hai 1 Thermal Power Plant

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

  • Receiving the trust of National Research Institute of Mechanical Engineering (Main Contractor), Chugai Technos performed the AIG adjustment and performance testing of the SCR system for unit S2.
  • Using simple equipment system, easy to disassemble, meet the ducts both horizontal and vertical, difficult to operation, tight space. Sampling and monitoring equipment comply with JIS standards.
  • Work content:
    • AIG adjustment: Surveying valve opening rate, outlet NOx distribution; Adjustment of the injection valves; Confirmation of distribution of NOx and ammonia slip after adjustment.
    • SCR performance test: Exhaust gas monitoring, differential pressure measurement, ammonia consumption survey.
  • Monitoring parameters: Temperature, pressure, velovity, flow rate, moisture content, gas composition (O2, CO2 and N2), SO2, SO3, NH3 concentration; continuous monitoring NOx/O2 by gas analyzer.
  • Report content:
    • Valve opening rate, NOx distribution coefficient before and after adjustment;
    • The basic exhaust gas parameters;
    • NOx/O2 concentration;
    • NOx removal efficiency;
    • Ammonia slip;
    • NH3/NOx molar ratio;
    • Conversion rate SO2 to SO3;
    • Distribution diagram: flow velocity, temperature, NOx/O2 , NHconcentration;
    • Comparison of actual measurement results and DCS data;
    • Data analysis, general evaluation and giving improvement plan;

Some pictures during the implementation of the project:

Adjusting the ammonia injection valve

NOx-O2 continuous monitoring

On-site analysis

Monitoring temperature and pressure of exhaust gas

Monitoring moisture content

SO3 sampling