In contrast to open diesel cleaning systems (open-loop scrubber) which wash the exhaust gas only with pumped seawater and then return the wastewater to the sea, closed (closed-loop) and hybrid systems are considerably more environmentally friendly.

SCHERZINGER gear pumps are used in this method: The emission of pollutants is reduced by washing the sulphur dioxides out of the exhaust gas. The wet scrubbing process functions like a shower here: The exhaust gases from the ship are irrigated with an alkaline solution from special nozzles. The small drops bind the sulphur dioxides here, then fall down and are collected in a tank – the cleaned exhaust gas escapes through the chimney. In the closed-loop systems and hybrid exhaust post-treatment systems, the irrigation nozzles in the exhaust gas scrubber are supplied by a special tank from within the ship – here only fresh water (closed-loop system) or sea- or fresh water (hybrid) is mixed with an alkaline substance (usually caustic soda). This substance is supplied to the tank in a precisely predefined concentration and amount and with the help of SCHERZINGER pumps. 

We are proud that our products can make a contribution to more environmental protection – and we are constantly developing solutions so that ships can be more environmentally friendly when in transit in the future. There is still much to be done – we will stay on it.