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Monday, October 19, 2020  (Comments: 1)

Swiss start-up Daphne Technology has developed a dry scrubber system, that the company says is an all-in-one, ready to install, turnkey solution for the shipping industry that simultaneously removes both SOx and NOx pollutants from marine engine exhaust gas.

The system, known as SulPure, purifies exhaust gas through three in-line stages: a pre-filtration unit, a nanotechnology purification unit, and a by-product collection unit.

The pre-conditioning unit passively removes particulate matters (PM), then, a purification stage using a nanotechnology patented by Daphne, is claimed to simultaneously eliminate SOx by up to 99.3% m/m and NOx by 85% m/m from the exhaust gas, figures which go beyond the IMO limits. In the third and final stage of purification, urea (or an alternative agent) is injected into the exhaust gas to neutralise acidic gases forming solid particles. These solid particles can then be recovered. The waste material can be sold on for use as agricultural fertiliser.

The company points out that SulPure will allow ships to operate using residual fuel, with the potential for significant savings in operating costs. Capital costs are said to be lower than with other emission reduction and exhaust cleaning technologies, while a SulPure system can be installed in under a week, without needing the ship to be dry docked.

Because there is no significant engine back pressure there is minimal impact on machinery operations, and SulPure is thought to be compatible with carbon capture technologies.

Because it is a dry system, there is no water or waste discharge and the only by-product is an upcycled fertiliser.

CEO Dr Juan Mario Machan said: "As we can expect to see the IMO, and possibly other regulators, strive for new, tighter rules that further limit NOx, particulate matter (PM) and black carbon, future proofing and continued research into exhaust gas abatement is vital so that an exemplary model can be established for the industry, and a solution can be implemented in response to regional laws on pollutants that are often inconsistent and fragmented.

Traditional open loop scrubbers, which account for about 80% of all exhaust gas system installations, were designed before the current environmental regulations were set and no longer offer what is needed. Nor do they offer much in the case of future-proofing." 

Machan further points out: "The contention with open loop technology is only gathering pace, with the total number of countries that are restricting or prohibiting the discharge of water wash from open loop scrubbers reaching 22. A re-thinking of expectations is required for exhaust gas cleaning systems to respond to current as well as future emissions challenges." 

Future plans from Daphne Technology, according to Machan, include commercialising a system currently in development that can offer carbon capture through the eradication of direct CH4 emissions (methane slip) with dual-fuel (LNG) vessels.

"Overcoming the shortcomings of outdated technology, by taking a technology first and regulatory agnostic approach, will enable shipowners to invest in solutions that combat current challenges and future proof against further regulatory changes," said Machan. 

Reader Comments (1)

Sounds very interesting. Look forward to hearing of operational experience.

By John Smith on Tuesday, October 20, 2020

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