Maritime SOx & PM filtersystem
Ecovac GmbH is a German engineering company that has designed and manufactured industrial filter solutions for 18 years. With an ideological background of reducing emissions from industrial exhaust gases, Ecovac has developed a filtration system that drastically reduces particular matter (PM) as well as sulphur. The system was initially designed for biomass burning heating plants, where it has proven its worth in a number of installations and tests.
Addressing the challenges of the maritime industry, Ecovac has adapted the land-based system for maritime use.
The solution is a modular and scalable filter system which allows for individualized adaptation to a customers needs and requirements. Vessels that only partially work in ECA can for example implement the solution on selected engines only. By 2020 additional modules can be installed without having to replace installed units.
The casing is made of stainless steel. The filter media are heat resistant cartridges. Depending on the application, the filter materials are made of Kevlar, Polyimide, Glass fiber, PTFE or other heat resisting materials. For maritime solutions a Kevlar filter is proposed.
Exhaust gas temperature is reduced to 170 C° with a heat exchanger placed between the engine and the filter. An infusion system adds the necessary amount of lime dust to achieve the required level of sulphur reduction.
The exhaust gas now passes through the filter cartridges and separates PM and sulphur. The accumulation of dust on the filter surface increases its efficiency through agglomeration. Once a preset pressure level is reached, the pneumatic filter cleaning is activated by the electronic control system, blowing compressed air through the filter element. The accumulated dust ‘cake’ is blown off and drops into the dust collector. As the cartridges are cleaned individually and staggered, the process is performed during engine operations without any increase in resistance.
A valve is installed in the exhaust pipe and the exhaust gases are guided from the exhaust pipe into the filter from an opening underneath the valve. The return exhaust pipe is mounted above the valve. In case of malfunction, the valve will allow continued engine operation while issues can be resolved.
Discharge falls into the discharge tract from where it is funneled into a pipe loop connected to a filter unit providing air flow and separating the discharge into a discharge container.