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Monday, February 17, 2020  (Comments: 1)

Smart Israeli Chemicals for Sustainability (SICS) says that it has developed a novel type of exhaust gas scrubber that enables removal of both SOx and NOx in a single process.

The company is collaborating with a South Korean partner, Jung won E&C, which is a shareholder in SICS, is DNV GL certified, and has installed one open-loop and three closed-loop scrubbers. SICS says that normal scrubbers work on the principle of a reaction between gas and liquid, working on a mode of counter current flow. The three types in common use are open-loop, closed-loop and hybrid – switchable between the other two types.

SICS says its fourth scrubber type – Safair – enables combined removal of SO2 and NOx in one process, in the same hybrid scrubber, and will allow ship operators to be a step ahead in the push towards IMO Tier III and 'zero emissions' vessels.

SICS technology is based on a catalyst of nano particles of Silica carrying Cobalt and Manganese Oxides suspended in water. The catalyst oxidises SO2 into SO4 Anion and NOx into NO3 Anion. The catalyst suspension is circulated across the scrubber in counter current flow to the exhaust combustion gases. Aa alkaline material like NaOH, NH4OH or KOH is injected into the scrubber to bind the Anions and create salt that is bled out of the scrubber. SO2 removal is claimed to be near to 100%, NOx removal about 90% and PM removal about 70%. The by-product is a solution mixture of Sulphate/Nitrate salts.

SICS has developed a further technology to separate the Sulphates and Nitrates by cooling crystallisation. If this system is installed on board, the Sulphates, which form most of the by-product, are discharged to sea and the smaller volume of saleable Nitrate salt is stored onboard the ship for discharge in port. Alternatively, all of the by-product solution can be stored onboard for separation on shore. SICS believes its solution for combined SO2/NOx removal will save CAPEX and OPEX, as well as onboard space. The company adds that since scrubber design is based on the exhaust gas content and flow rate it should prove simple to retrofit the SICS catalyst system to an installed scrubber. The installation is 'plug and play' using a transportable module containing all the required equipment prepared ahead of installation on the ship.

Another advantage cited by SICS for Safair is full intensive oxidation of SO2 into SO4 by the catalyst. "The main claim against open-loop system is increasing acidification of sea water," says Doron Cohen of SICS. "These phenomena may happen because of the presence of Bisulphite salts that may convert into Sulphuric acid. In our technology the by-product is very stable Sulphate without any Bisulphite salts. The SO2 removal efficiency is not dependent on the Sulphur content of the heavy fuel oil and customer may use the cheapest available HFO."

Reader Comments (1)

Hi, Just wondering if there are any independent verifications - such as tests performed by an academic laboratory - supporting the performance claims. Best wishes

By Dr Alec D Coutroubis on Tuesday, February 25, 2020

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