Selective Catalytic Reduction (SCR) System

Air Quality Control Systems (AQCS)

  • Maximum Capacity

    1,050 MW

  • Max. NOx Removal Efficiency

    95%

  • Low Environmental Impact

    Slip NH3 < 2ppm

  • SCR Catalyst

    High Reliability
    High Durability

The selective catalytic reduction (SCR) removes nitrogen oxides (NOx) from flue gas emitted by power plant boilers and other combustion sources, and the catalyst is the key component of this system. Mitsubishi Power has compiled more than 40 years of experience in the supply of highly reliable SCR catalyst for its sophisticated flue gas treatment systems, contributing to the prevention of air pollution.

Special Features

We have supplied more than 1,400 SCR plants and catalyst units worldwide and have gained a larger market share with systems offering the following features:

  • High NOx reduction meeting required emission standards for all kinds of fossil fuels
  • Integrated NOx reduction linked with boilers/HRSGs
  • Best optimization of catalysts for customers‘ requirements
  • Multiple pollutant control to include mercury and low sulfur trioxide
  • High reliability
  • Long-term catalyst maintenance

Basic Principle of NOx Reduction

The basic principle of SCR is simple. Ammonia is injected into the flue gas and NOx is decomposed into N2 and H2O vapor. The SCR catalyst efficiently facilitates ammonia and NOx reactions. The process forms no harmful by-products. Also plants using the SCR catalyst are easy to maintain and are capable of stable operation.

Chemical Reactions

  • 4NO + 4NH3 + O2 → 4N2 + 6H2O
  • 6NO2 + 8NH3 → 7N2 + 12H2O
Selective Catalytic Reduction (SCR) System-01.jpg

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