EGC Systems and the challenges of meeting emission legislation
The Sulfur emission legislation is no exception and the use of Scrubbers –or Exhaust gas cleaners – provides a good solution to this challenge.
The installation of exhaust gas cleaning systems (EGC) often differs from other, regular onboard systems as it is being installed as retro-fit in vessels designed without foreseeing the need of available space necessary for making the optimal system installation, ensuring best conditions for the performance of the equipment.
The challenges regarding the best placement of the pumps and tank, varies from vessel to vessel, and needs to be thoroughly analyzed in order to achieve best efficiency and lowest cost of ownership possible. Moving a pump from one deck to another may change the power requirement significantly, which not only has an impact to the system acquisition cost but also the service cost.
The selection of the most suitable system configuration is influenced by the nature of the ship and its normal service. Considerations regarding the selection of the simple “open-loop” vs. the far more comprehensive “Closed-loop” system will definitely be heavily influenced by a thorough calculation of the cost of ownership, involving the ship sailing pattern and its presence in ECA zones, together with the possibilities of discharging the residual fluids in accordance to the legislation, and the price gap between MDO and the heavy bunker fuel available.
For the time being, the Sulfur emission legislation applies to designated areas known as Emission Control Areas. We have seen the number of ships with scrubbers growing and we expect this to be only the beginning. The majority of installed scrubbers have been as retrofit projects however, with the legislation going into effect globally in 2020 (or 2025 depending on IMO) more and more new-buildings will also need to find ways to comply with regulations.
For the Closed Loop technologies, usually a part of a hybrid solution, Sodium Hydroxide is a frequently used scrubbing media. The water is cleaned in process tanks onboard the vessel before it is released into open sea.
Quality pumps, the best Total Cost of Ownership in the market and more than 250 pumps installed in scrubber plants has led to a valuable accumulation of know-how regarding the governing and control of the pumps. No application is alike. Far from all vessel duty patterns are the same. Hence every project needs to be analyzed in details, to ensure best selection and combination of the pump package.
Iron Pump has over the last years gained substantial knowledge regarding the challenges of the capacity regulation of the EGC system, and the control of the centrifugal pumps in particular. The corporation with EGC system providers has led to the accumulation of specific competences regarding the selection and placing of the pumps together with the challenging programming of the frequency controllers when dividing the pump work in two or more pumps in parallel.
Recently, IRON Pump delivered a sea-water and a process water pump for a retro-fit scrubber plant on a large Baltic Sea cruise ferry. Pumping seawater and chemicals through a scrubbing system requires an efficient pumping system, configured to that exact purpose. High temperatures and harsh elements ask for world class water pumps.
READ more and contact Iron Pump for detailed information and assistance when designing your next EGC system.