W RT-flex58T-D (1)

Wärtsilä has introduced its first China-built two-stroke engine with a high-pressure selective catalytic reduction (SCR) system.

Manufactured at the Hudong Heavy Machinery (HHM) in China, the system is equipped with a five-cylinder Wärtsilä RT-flex58T-D two-stroke, low-speed engine.

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Hudong Heavy Machinery R&D center executive director Zhou Weizhong said: "HHM is very happy to deliver the first two-stroke, high-pressure SCR produced in China.

"We have been working on development of the SCR with major designers during the past three years and now the cooperation with WinGD shows what is possible."

According to Wärtsilä, this is the first SCR system capable of meeting the International Maritime Organization’s (IMO) Tier III regulations for engine emissions of nitrogen oxide (NOx).

The new SCR system has been developed by HHM and Winterthur Gas & Diesel (WinGD), a joint venture between Wärtsilä and China State Shipbuilding Company (CSSC).

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"This is the first SCR system capable of meeting the IMO’s Tier III regulations for engine emissions of nitrogen oxide."

Wärtsilä RT-flex58T-D will be installed in a new 22,000dwt multi-purpose vessel, which is currently under construction at the Ouhua shipyard on behalf of China Navigation (CNCo).

Scheduled for delivery in the second quarter of this year, the new vessel has been designed to provide enough space for positioning the SCR between the engine exhaust valves and the turbocharger turbine inlet.

CNCo fleet director Martin Cresswell said that the company will receive 15 new vessels over the course of this year, with all being fitted with Wärtsilä engines manufactured by HHM.

Maritime classification society Lloyds Register has approved test bed trials of the new engine with the SCR system.

Image: HHM manufactured a Wärtsilä engine and the selective catalytic reduction system. Photo: courtesy of Winterthur Gas & Diesel.