Siemens Aktiengesellschaft

Klaus Rusch

Lothar Hofmann

Wieland Mathes

Ralf Sigling

Raimund Müller

Petra Anette Rusch

The process and the device are provided for the selective catalytic reduction of nitrogen oxides in an oxygen-containing gaseous medium. The reducing agent required for the reaction is prepared in a separate preparation reactor. A substance that can be converted into the reducing agent is introduced into a carrier gas in the preparation reactor and, as a result, is converted by substantially thermal conversion. The energy required for the conversion is provided by the carrier gas.

Process and device for the selective catalytic reduction of nitrogen oxides in an oxygen-containing gaseous medium

A microwave hydrolysis reactor for converting urea into ammonia has one or more reaction chambers into which a urea solution is fed via a feed device and a discharge device for discharging an ammonia-water mixture. A catalytic converter is arranged in the reaction chamber. A microwave-transmitting device allows irradiating so that energy is fed to the urea solution in the reaction chamber.

Process for converting urea into ammonia

A device for catalytic removal of a pollutant from an exhaust gas of a combustion system, particularly, a fossil-fired power plant or an internal combustion engine, includes an exhaust-gas duct for carrying exhaust gas, a reagent, a muffler having an injection space and a mixing space for mixing the reagent with the exhaust gas, an injection device for introducing the reagent into the exhaust gas in the injection space, at least one catalytic converter disposed in the exhaust-gas duct, and mixers disposed at least one of before and after the injection space with respect to a direction of flow of the exhaust gas. The mixers define a distance therebetween, and the distance is matched to a frequency of sound to be damped in the exhaust gas. According to the invention, the injection chamber and the downstream mixture chamber are embodied as a muffler in order to reduce the emissions of sound while enabling the production of a device having a compact structure.

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Litzendorf, Germany

Klaus Rusch