MAN aims to introduce dry scrubber technology

22 Sep 2010
Simplified illustration of an MAN Diesel & Turbo engine with a DryEGCS system

Simplified illustration of an MAN Diesel & Turbo engine with a DryEGCS system

MAN Diesel & Turbo has signed a cooperation agreement, with an eye on upcoming emission regulations, with the German company, Couple Systems, to work together on dry exhaust gas scrubber systems.

As an environmental technology player within the marine world, Couple Systems has developed and patented its DryEGCS (Exhaust gas cleaning system), a dry-scrubbing system suitable for marine applications. MAN says that extensive field tests have already proven DryEGCS’ worth and the system was certified by German classification society, Germanischer Lloyd, in April 2010.

“The cooperation agreement aims to jointly develop customer solutions for dry scrubbing technology and to expand its application as far as possible,” says Dr Dirk Thum, MAN Diesel & Turbo, head of marine engineering medium-speed, emission and gas. “As a system supplier, MAN Diesel & Turbo will offer integrated solutions to its customers for engines and exhaust-gas cleaning systems featuring a scrubber and SCR catalyst for NOx reduction. This enables ships to operate economically on HFO and simultaneously comply with even the most stringent emission regulations.”

According to MAN, future tighter sulphur limits for fuels, introduced stepwise through 2010, 2015 and 2020, require technical solutions for ships that offer operation modes for either within or outside of ECAs (Emission Control Areas). As of this year, stringent sulphur limits are already in place for vessels berthing in European ports.

In contrast to imminent NOx regulations, the sulphur limits apply to both newbuildings and existing vessels. Essentially, ship operators can choose between switching to significantly more expensive, low-sulphur fuels (LSFO or distillates) or installing a desulphurisation plant (scrubber) that removes SOx from exhaust gas.

While current scrubbing systems mostly work on a wet base that has some inherent drawbacks, dry scrubbers claim to represent a simpler solution that removes up to 99% of SOx from exhaust gas by means of a reactor filled with granulate of calcium hydroxide.

Dry scrubbers are said to possess several advantages over wet scrubbers including:

  • no significant lowering of exhaust-gas temperature enabling an SCR located downstream to reach its operating temperature. NOx and SOx can thus be removed in one exhaust-gas cleaning system,
  • negligible energy consumption,
  • an easily handled and recyclable granulate and
  • no transmission of pollutants into the sea during use

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