We are seeking novel approaches to eliminate SOx and NOx emissions from ship engine exhaust as a way of satisfying Sulfur Emission Control Area requirements while burning high sulfur fuels.
The ideal solution would be roughly half the total cost (capital and installation) of traditional closed-loop, in-line wet scrubber systems and easily retrofitted onto cargo ships and passenger/freight ferries currently operating in the Sulfur Emission Control Areas.
The companies comprising the Swedish-based Stena Sphere represent one of the largest private shipping groups in the world. We are seeking solutions that can be applied to cargo and passenger ships that travel in all of the world’s oceans.
Historically, our ships run on a wide range of fuel types (with sulfur concentrations up to 3.5%) and under a wide range of engine operating conditions. Recent changes to SECA fuel sulfur limits (from 3.5% to 0.1%) require us to either purchase costly low-sulfur fuel, or install SOx scrubbers to eliminate the equivalent amount of sulfur from our ship engine exhaust.
Stena has had good success recently using closed-loop, in-line wet scrubber systems. However, the cost of these systems prevent rapid, broad adoption across our fleet operating in Sulfur Emission Control Areas.
Key barriers we have encountered in reducing the cost of installing scrubbers include:
Current systems require large volumes of sea water, requiring large pumps and piping. Closed loop systems require a cooling step using large volumes of sea water. Open loop systems require large volumes of sea water to capture SOx from the exhaust gas.
We would consider novel designs for wet scrubber systems that are more compact, less complex, lower capital, or easier to install on existing vessels.
We would also consider emerging technologies for SOx and NOx reduction based on alternative modes of operation.
Any solution would need to be consistent with the practical space limitations for installation in existing vessels, and would not require specialized skills or extensive training of operating personnel.
Open loop scrubbers that discharge directly into the sea.
We are looking for concise, non-confidential proposals. The proposal should describe the technical approach and should ideally include information on the technological readiness of the proposal, any proof of concept data, reference to any peer reviewed publications, and potential route to commercialization.