Engine developer WinGD has launched the first marine two-stroke engine to carry its own NOx abatement solution, reducing engineroom space requirements and installation costs while meeting IMO Tier III emission limits
WinGD’s Otto-cycle, low-pressure, two-stroke X52 engine with integrated selective catalytic reduction (iSCR) was launched during a ceremony at China’s Dalian Marine Diesel Co. With a maximum continuous output of 11,640 kW, the six-cylinder prime mover will be installed on a 50,000-dwt tanker being built by CSSC Chengxi Shipyard for Japan’s Kumiai Senpaku.
While SCR technology is well proven, WinGD director of global sales Volkmar Galke said, “Making a more compact, on-engine solution has occupied developers for a long time and we’re delighted to have reached this landmark with the help of our partners, and to be able to offer big cost savings and even greater ship design flexibility to our customers.”
SCR is one of the most effective methods of reducing NOx emissions in line with IMO’s Tier III requirements. As with all off-engine aftertreatment methods there are multiple constraints: high exhaust temperatures are required for effective operation; additional installation costs are incurred for auxiliary equipment alongside the engine; and more space is required for additional equipment, meaning less flexibility in ship design and cargo-carrying configurations.
The X52 engine will have a high-pressure (HP) SCR reactor integrated on-engine, directly to the exhaust manifold. This reduces off-engine auxiliary equipment and piping, lowering installation costs and space requirements. Additionally, the location of the SCR directly upstream of the turbocharger means higher operation temperatures, conducive to more effective NOx removal. The iSCR-fitted engine also offers low heat dissipation, easy switching between IMO Tier II and IMO Tier III modes, and WinGD’s latest automation and control systems with monitoring and predictive diagnostic features. Lastly it offers customers fuel flexibility in that HP-SCRs can still run on high sulphur fuels which extends the savings to reduced operational costs.
Development of the X52 engine with iSCR was a collaborative effort between WinGD and the China Shipbuilding Power Engineering Institute, both owned by China State Shipbuilding Corp’s CSSC Power Group.
NOx emissions aftertreatment is needed for all marine engines burning HFO or marine diesel.
WinGD aims to make iSCR available as a first step for single turbocharger applications of its diesel-burning X-series low-speed engines.
While NOx abatement is also needed for high-pressure engines using LNG as fuel, WinGD’s low-pressure X-DF dual-fuel engines comply with IMO Tier III without aftertreatment - again reducing installation costs, complexity and space requirements for shipyards while reducing capex and opex for shipowners.
Riviera Maritime Media’s Marine Propulsion Webinar Week is being held 26 July 2021 – use this link for more details and to register