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GEA to supply thomas zement turnkey plant for the reduction of NOx in flue gas

12 Apr 2019

GEA has received an order from thomas zement for a turnkey plant for the reduction of NOx in flue gas. The order comprises two new reactors for selective catalytic reduction (SCR) including handling of the flue gas transport by induced draft (ID) fans and integration into the Erwitte production site. The contract also includes engineering services as well as the supply, installation and commissioning of steel structures, SCR catalysts, ID fans, heating circuits, duct connection and adaptation of NH3 injection from existing storage tanks. Production can continue during the installation of the SCR unit. Another very important advantage for the customer: Only a short changeover time is required.

An example of a GEA flue gas treatment plant for nitrogen oxides. (Photo: GEA)

An example of a GEA flue gas treatment plant for nitrogen oxides. (Photo: GEA)

With this investment, thomas zement is supplementing the existing non-catalytic technology. After installation, this will create one of the most environmentally friendly cement production plants in Europe.

GEA competence in selective catalytic reduction

Selective catalytic reduction (SCR) is a technique for the reduction of nitrogen oxides in exhaust gases from industrial plants. The chemical reaction at the SCR catalyst is selective. This means that the nitrogen oxides (NO and NO2) are preferably reduced, while undesirable side reactions such as the oxidation of sulphur dioxide to sulphur trioxide are largely suppressed. SCR technology reduces nitrogen oxide (NOx) in the the catalyst passing gas flow upto 95 percent. The core is the catalyst, which makes it possible to reduce the reaction temperature from around 1000°C to a range of 230°C to 400°C. High reduction rates can thus be achieved with a minimum of ammonia slip.

Due to an adequate low sulphur concentration and a sufficient temperature level, the SCR unit is installed low-dust behind the existing fabric filters. This arrangement has already proven itself in three successfully operated plants with the lowest NOx and NH3 emissions. Analyses of catalyst samples consistently show no loss of the high reactivity of the selected material and thus a long catalyst life.

Many years of GEA experience in exhaust gas purification

GEA has more than 120 years of experience in exhaust gas purification for industrial applications such as cement, glass, iron and steel, non-ferrous and chemical industries and is a world leader in the provision of process technology, equipment and services.

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