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 and the supply, installation, and commissioning of steel structures, SCR catalysts, ID fans, heating circuits, dust connection, and the adaptation of NH3 injection from existing storage tanks. Production can continue during the installation of the SCR unit. Another important factor is a short changeover time.
With this investment, thomas zement is supplementing its existing non-catalytic technology. After installation, this will create one of the most environmentally friendly cement production plants in Europe.
SCR is a technique for the reduction of nitrogen oxides in exhaust gases from industrial plants. The chemical reaction of 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 SO2 to SO3 are largely suppressed. SCR technology reduces NOX in the catalyst, passing gas flow up to 95%. The core is the catalyst, which makes it possible to reduce the reaction temperature from around 1000°C to a range of between 230°C and 400°C. High reduction rates can thus be achieved with a minimum ammonia slip.
Due to an adequate low sulfur concentration and a sufficient temperature level, the SCR unit is installed low-dust behind the existing fabric filters. This arrangement has operated in three 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.
Read the article online at: https://www.worldcement.com/europe-cis/04092019/gea-to-supply-thomas-zement/
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