ANDRITZ DeNOx/SCR plant, Linz, Austria
  • Pulp & Paper
  • 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

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.

Flue gas cleaning plants for Waste to Energy applications

The global economy is in constant need of power, which is still mainly provided by coal, oil and gas – fossil fuels that are finite and harmful to the environment over their whole value chain. Other more sustainable resources such as municipal waste or sludge have started to establish their position in the industry and are gaining more attention now due to the global effort to develop and install solutions that will minimize CO2 emissions.

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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 especially for Waste-to-Energy plants or other industrial applications.

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Power generation

Reliable, efficient power generation from traditional and renewable fuels

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ANDRITZ delivers environmentally friendly flue gas cleaning solutions, tailored to the needs of our clients and their operating environments. We are an environmental technology pioneer with a history in air pollution control spanning 30+ years. Our products range from flue gas scrubbers and SCRs for power stations to complex flue gas cleaning systems for waste-to-energy and industrial plants. Use of cutting-edge engineering tools and global R&D collaboration with a network of recognized partners and universities are the foundations of our work. Early identification of each client’s needs help us make a long-term contribution to clean air and a clean environment.


  • Utility power industry
  • Waste to Energy / Energy from Waste / Sludge incineration
  • Pulp & Paper
  • Mining & Metals industry
  • Oil & Refinery industry
  • Marine industry


We look forward to talk to you about our environmental solutions and technologies!

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

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