DeNOx/SCR plant, Linz, Austria
  • Environmental solutions
  • Air pollution control
  • DeNOx systems, selective catalytic reduction (SCR)

DeNOx systems - Selective Catalytic Reduction (SCR)

Technology for power stations, Energy-from-Waste plants, and industrial plants

ANDRITZ Air Pollution Control was among the first companies in Europe to successfully employ Selective Catalytic Reduction (SCR) technology. The company now has numerous references in the DeNOx/SCR sector, which encompass a variety of applications. In addition to use in power plants (high dust configuration), we also have successfully employed selective catalytic reduction (SCR) technology for waste incineration and other industrial processes.

DeNOx systems, selective catalytic reduction (SCR)

Thanks to our wide-ranging expertise we are capable of customizing operational parameters, catalyst geometry and composition as well as the most suitable reagent for each application.

DeNOx/SCR systems are used in the following plants:

Power plants

  • Gas-fired
  • Oil-fired
  • Coal-fired
  • Biomass-fired

Energy-from-Waste plants

  • Household waste
  • Hazardous waste
  • Hospital waste

Industrial plants

  • Steel industry
  • Oil industry
  • Pulp and paper industry

DeNOx/SCR plant, Linz, Austria


DeNOx/SCR plant, Mellach, Austria


The location of the DeNOx/SCR system within the flue gas cleaning process depends on the type of fuel involved. The tail-end configuration has proved to be highly effective in Energy-from-Waste and biomass-fired plants. The active centers of the catalyst are only harmed by a minimum of catalyst poisons, which results in a longer lifetime.

Due to the use of a reheating system, the investment and operating costs are higher for the tail-end configuration which is therefore mainly used in industrial applications.

The high dust configuration is preferred for power plants (coal, gas, oil), as the costs for reheating can be avoided. ANDRITZ Air Pollution Control has an extensive database concerning catalyst life for a variety of fuels. Consequently, we are able to optimize and minimize the catalyst volume for every application.

Wet flue gas cleaning systems

ANDRITZ provides novel scrubber system (FGDplus) that maximizes SO2 and dust removal while keeping energy inputs to a minimum.

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Dry flue gas cleaning

ANDRITZ dry flue gas cleaning systems meet the requirements for complying with the world’s strictest emissions legislation, the desire for low consumption of additives, the need for minimal residues, and the installation simplicity of a compact design.

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Combined/multi-stage flue gas cleaning systems

Our complete product portfolio allows us to comply with the most difficult requirements through the intelligent combination of our processes and technologies.

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Power generation

Reliable, efficient power generation from traditional and renewable fuels

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ANDRITZ power plant service experts work in close cooperation with customers to improve the safety, performance, stability, availability, and efficiency of power generation equipment. ANDRITZ is well-positioned to offer the full support our customers need.

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We look forward to meeting you at one of our stands and talk to you about our environmental solutions!

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Customized technologies and service solutions for various industries

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Read success stories of several projects in the pulp, paper and power industry.

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  • ANDRITZ Air Pollution Control brochure

    ANDRITZ is the reliable partner for flue gas cleaning technologies.

    PDF : 6 MB