Combined exhaust and flue gas treatment plants

Flue gas treatment technology

The treatment of industrial exhaust gases and flue gases from thermal processing plants, power stations or general and hazardous waste incineration plants places high demands on the air pollution control technology.

Sustainable – and safe too

These flue gases contain variable combinations and concentrations of pollutants, such as SOx, HCI, HF, NOx, CO and particulates as well as environmentally harmful heavy metals and organic compounds, such as dioxins, furans and hydrocarbons. The levels of these pollutants must be reduced to below the permitted emission limits before being released into the atmosphere. And it is often possible to convert the pollutants into reusable materials.

Because environmental protection agencies and local residents are generally highly sensitive about such matters, it makes sense for plant operators who take a long-term view to adopt sustainable flue gas treatment technologies. Topics such as sustainability and carbon dioxide emission reduction (carbon footprint) have long been integral aspects of our strategy.

Our proprietary cutting-edge technologies, research and development and extensive experience in the industry of many years make Steuler your competent partner of choice for complete exhaust gas treatment systems in a wide range of application areas.

Steuler Equipment Engineering supplies state-of-the-art exhaust gas scrubbers that feature excellent pollutant removal rates combined with low investment and operating costs, maximum operational reliability while being easy to operate and maintain.

Typical industry sectors

  • Combustion power plants that use coal, oil or other fuels: typically cogeneration plants fired with coal, fuel oil or similar dirty fuels
  • Incineration plants for the disposal and/or thermal processing of industrial residues: typically hazardous waste incineration plants, dross incineration plants, off-gas incineration, sewage sludge incineration
  • Thermal processing plants, such as recycling plants, soil decontamination plants, ammunition disposal plants, calcining plants, zinc smelting works, roasting and sintering plants, etc.
  • Chemical and petrochemical processing plants: typically production facilities for the raw materials, cosmetic and pharmaceutical industries

The secret lies in the mix

By perfectly combining and balancing specific, high-performance flue gas treatment stages, Steuler is able to devise the best possible solution for almost any application

The following summary gives an overview of the flue gas treatment methods most frequently used by Steuler:

  • Chemical flue gas scrubbers with or without packing material and alkaline scrubbing liquid, usually caustic soda for removing acidic pollutants, like SOx, HCl, HF, etc. or with acidic scrubbing liquid or water for removing HCl and heavy metals, often with additives for binding mercury
  • Quenchers for quickly and safely lowering the temperature of hot flue gases
  • Filter mat scrubbers for reliably removing water-soluble acidic aerosols
  • Bag filters for reliably removing fly ash and fine particulates
  • Dry scrubbers, based on bag filter systems with the addition of hydrated lime or NaHCO3 and activated charcoal to simultaneously remove fly ash, acidic compounds and also heavy metals, dioxins and furans
  • SCR/DeNOx catalyst units for the selective catalytic reduction of NOx
  • SNCR/DeNOx units for the selective non-catalytic reduction of NOx
  • Catalyst units for decomposing dioxins and furans, often in combination with SCR/DeNOx
  • Oxidation catalyst units for oxidizing CO and hydrocarbons at comparatively low temperatures
  • Thermal post-combustion units for the reliable, complete oxidation of non-specific flue gas constituents at up to 1,100 °C
  • Heat recovery systems, from heat transfer systems to hot water boilers and steam generators
  • HF dry scrubbers using Steuler lime modules for simply removing HF with minimal pressure drop