Dürr Systems, Inc. products

Inorganic pollutants and particulates can be treated using a broad range of absorption technologies also known as “scrubbers”.   Various different scrubber designs are available depending on the application.  For example, venturi, rotation and dynamic scrubbers are used for the abatement of particulates - even at high temperatures and extremely sticky conditions - where fabric filters are not suitable. For the treatment of inorganics such as SOx and NH3, WetSORB™ spray and column scrubber system are the most effective solution.  Depending on the input concentration, the required efficiency  - and local conditions, such as disposal of waste water or supply of reactants – DrySORB™ dry or semi-dry scrubber systems can also be used.

The KeraSORB™ packed-bed filter system uses broken limestone pieces for the absorption of fluorine and HF.  The patented system was originally developed for the treatment of the waste gases in the ceramic and brick industry, where HF emissions are widespread.  Using a specially-designed cascade system - in which waste gas flows over a fixed-bed of limestone in a cross-flow direction - pressure drops of only 30% are achievable compared to fabric filter systems. The used reactant can also be re-used after passing a peeling drum. This saves on fresh limestone and reduces the need to refill the integrated silo - a perfect solution combining lowest capital and operating expenses.

In order to reduce the energy consumption of thermal systems at low VOC input concentrations, systems to increase the VOC concentration can be highly cost-effective. For processes operating round the clock, a RoCoSORB™ continuous rotor concentrator system is used.  This incorporates a rotating adsorber wheel which enable continuous collection and desorption of the VOC.  The VOC are collected on an adsorber until a pre-specified level has been reached at which point a small air flow is then used to desorb the VOC at a higher concentrated flow. For discontinuous applications, BaCoSORB™ batch concentrator systems are available. Here, the desorption process is run during a scheduled stop in production (for example, at night or the weekend). The concentrated VOC gas stream is then typically fed into downstream thermal oxidiser unit to complete the purification process.