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Chimneys

Burning fossil fuels produce flue gases, which are guided through chimneys through the various cleaning stages, such as denitrification,(DENOX), de sulfurization (DESOX) and dust removal, before being discharged into the atmosphere.

 

Purpose of insulation

Insulation systems on chimneys have the following purposes:

  • Reduce heat losses in the flue gas, thereby preventing sub-dew point (acid or water dew point) conditions in the flue gas on the interior surfaces of the flue gas duct. This also minimises the corrosion risk. This also applies to areas with structural thermal bridges, such as support constructions, reinforcements etc.
  • Reduce the heat losses in flue gas channels with downstream heat recovery
  • Guarantee protection against contact
  • Adherence to technical specifications with regard to noise

Products

ProRox WM (ROCKWOOL wired mats) have been a proven solution for chimneys for many years. They are flexible and can fit onto different geometries and surface structures. ProRox WM (ROCKWOOL wired mats) are non-flammable, have high maximum service temperatures (above 300°C and up to 680°C) and exhibit a low thermal conductivity across the total temperature range.

The recommended insulation for round chimneys, where temperatures are below 300 °C, is load-bearing lamella mats ProRox MA 520 ALU (ROCKWOOL Duraflex). These are mounted directly onto the chimney and are fastened with straps.

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