More Power In Wärtsilä 32 Engine: Wärtsilä increases power in 32 engine range
Wärtsilä has announced an increase in power for its 32 engine range. Now at 580 kW/cyl at 750 r/min, the engines received a 15% increase in rated power output. The engine line now covers a power range of 3 to 9.3 MW with options available from six to 16 cylinders.
The largest contributor to the power increase was a redesign of the turbocharger by increasing the receiver pressure, said Wärtsilä. To accommodate the increased turbocharger pressure, the fuel injection system also had to be modified to inject more fuel. With additional pressure now in the engine, some of the components also had to undergo some design changes and change of materials to withstand the higher pressure. Wärtsilä said the turbocharger development allows the same amount of power with fewer cylinders, citing a 12-cylinder configuration together with the company’s low-loss concept electric power distribution system could replace a 16-cylinder engine configured with a traditional power distribution system.
Performance values, such as fuel consumption, emission compliance and exhaust gas temperatures, have not changed from the previous output models. External dimensions, with exception of the turbocharger configuration, have also remained unchanged. Bore and stroke is 320 mm and 400 mm, respectively. The mean effective pressure is 28.8 bar when the cylinders run at 580 kW/cycle. Piston speed is 10 m/s. It can operate on heavy fuel oil, marine diesel oil and liquid biofuels.
In addition, the Wärtsilä 32, like all of Wärtsilä’s engines, was designed to operate on low sulfur fuels. It can also be equipped with selective catalytic reduction (SCR). The engine is ready for IMO Tier 3 and currently is IMO Tier 2 compliant. Also for NOx reduction and reduced fuel consumption, the engine is equipped with a variable inlet curve closure unit (VIC). This allows early inlet valve closure at high load. Wärtsilä said by switching to late inlet valve closure, load and transient performance is ensured and the engines experience improved part-load performance, smoke reduction and improved load acceptance.
The Wärtsilä 32 engine was first introduced more than 20 years ago and has since sold more than 4000 units to the marine sector alone. It can be used in mechanical drive, diesel electric or as an auxiliary engine, and configured to run at either a constant speed or in a combinatory curve. The engine is typically selected to power different types of tankers, container vessels, and offshore support and drilling vessels, in addition to the cruise ships and ferries.
In auxiliary electric production, the Wärtsilä 32 is utilized in all vessel categories where high auxiliary load is needed. It can also be used in power generation applications. The 6 L and 12 V configurations are available this year, with the eight-, nine- and 16-cylinder versions of the Wärtsilä 32 expected to be available in 2012.