Wärtsilä gas-fired engines
The new Wärtsilä 50SG is a four-stroke, spark-ignited gas engine operating on the Otto cycle and incorporating the lean-burn principle. It has been designed using the proven gas technology used in the smaller Wärtsilä 34SG engine.
An important feature of this new gas engine in Wärtsilä’s portfolio is its exceptionally high power plant net electrical efficiency rating - more than 53% in combined-cycle mode.
World's largest gas engine - Wärtsilä 50SG
With the launch of the Wärtsilä 18V50SG gas engine, Wärtsilä now has two high-output, highly efficient prime movers when entering the market for large-scale power generation. The new Wärtsilä 18V50SG is the world’s largest gas-powered generating set and is ideally suited for use in locations where a constant supply of gas is assured. On the other hand, when gas supplies cannot be guaranteed under all circumstances, the dual-fuel Wärtsilä 50DF is the right choice. Read more about the Wärtsilä 50SG engine from the article - World's largest gas engine.
The lean-burn gas engines (SG) feature port admission of gas, prechamber with controlled gas flow as well as individual cylinder control of gas charge and ignition timing. This choice of concept along with extensive research in combustion and combustion control has made it possible to elevate the efficiency from 40% to more than 49% in the bigger engine models. The combination of high efficiency and low emissions is probably unequalled in the market.
Engine working principle of spark-ignited engines (SG)
The SG engines are spark-ignited lean-burn otto cycle gas engines. In this process, the gas is mixed with air before the inlet valves. During the intake period, gas is also fed into a small prechamber, where the gas mixture is rich compared to the gas in the cylinder. At the end of the compression phase the gas/air mixture in the prechamber is ignited by a spark plug. The flames from the nozzle of the prechamber ignite the gas/air mixture in the whole cylinder. After the working phase the cylinder is emptied of exhaust and the process starts again.
Read more about Wärtsilä gas power plants.
The Wärtsilä 34SG is a four-stroke, spark-ignited gas engine that works according to the Otto process and the lean-burn principle. The engine has ported gas admission and a prechamber with a spark plug for ignition. The gas fuelled, lean-burn, medium-speed engine is a reliable, high-efficiency and low-pollution power source for baseload, intermediate peaking and cogeneration plants.
The Wärtsilä 34SG combines high efficiency with low emissions. This is achieved applying state-of-the-art technology with features including:
- Use of a lean gas mixture for clean combustion
- Individual combustion control and monitoring, providing even load on all cylinders
- Stable combustion, ensured by a high-energy ignition system and precombustion
chamber
- Self-learning and self-adjustable functions in the control system
- Efficient heat recovery design
- Minimal consumables.
| Technical data |
|
9L34SG |
16V34SG |
20V34SG |
| Power, electrical (50 Hz / 750 rpm) |
kW |
4340 |
7740 |
9730 |
| Power, electrical (60 Hz / 720 rpm) |
kW |
4170 |
7430 |
9340 |
| Genset dry weight (±5%) |
tonne |
77 |
120 |
130 |
The world's largest gas engine
The Wärtsilä 50SG is a four-stroke, spark-ignited gas engine that works according to the Otto process and the lean-burn principle. The engine has ported gas admission and a prechamber with a spark plug for ignition. The engine has an electrical output of 18,321 kW, making it the largest gas powered generating set in the world.
The efficiency of the Wärtsilä 50SG is the highest of any spark-ignited gas engine today. The natural gas fuelled, leanburn, medium-speed engine is a reliable, high-efficiency and low-pollution power source for flexible baseload, intermediate peaking and combined cycle plants.
The Wärtsilä 18V50SG was developed in response to the market need for larger gas engines. Its design principles are based on the well-proven technology of the Wärtsilä 34SG and Wärtsilä 50DF gas engines. The Wärtsilä 50SG lean-burn gas engine utilizes the frame of the Wärtsilä diesel/heavy fuel engine with its advanced integrated lube oil and cooling water channels. The bore is 500 mm and it maximizes the power potential of the engine block.
The Wärtsilä 50SG meets current and future requirements for the overall cost of ownership. It is designed for flexible manufacturing methods and long maintenance-free operating periods. The engine is fully equipped with all essential ancillaries and a thoroughly planned interface to external systems.
The Wärtsilä 50SG combines high efficiency with low emissions. This is achieved by applying state-of-the-art technology with features including:
- Use of a lean gas mixture for clean combustion
- Individual cylinder combustion control and monitoring, providing even load on all cylinders
- Stable combustion, ensured by a high-energy ignition system and precombustion chamber
- Self-learning and self-adjustable functions in the control system
| Wärtsilä 50SG |
|
18V50SG |
| Power, electrical (50 Hz / 500 rpm) |
kW |
18 320 |
| Power, electrical (60 Hz / 514 rpm) |
kW |
18 760 |
| Genset dry weight (±5%) |
tonne |
360 |
| Reduced transport weight (±5%) |
tonne |
285 |
