MAN 35/44G Makes Successful Début

Press Release
Wednesday, January 23, 2013

MAN Diesel & Turbo recently showcased its new range of gas engines and turbines at its Augsburg facility with the company’s 35/44G engine, the latest addition to its four-stroke power portfolio, featuring prominently.


Martin Kalter – Vice President Sales Power Plants – MAN Diesel & Turbo, said: “Essentially, the MAN 35/44G offers customers a compact, clean and flexible power solution for baseload, peaking and cogeneration plants and meets requirements for total cost of ownership for energy production with fast ramp-up times and long times between overhauls.”


The newly developed Otto gas engine has an electrical efficiency of 47.2%, and is available for Combined Heat & Power (CHP) and/or jointly with an MAN steam turbine of the MARC series – in a combined cycle mode reaching high total plant efficiencies with low emissions. It also features a single-stage turbocharger with variable turbine area (VTA) technology and many innovative technological elements. The spark-ignited unit, which is ideal for combined cycle and combined-heat and power configuration with waste-heat utilisation, complies with all current emission limits solely by in-engine measures.


Power density
The 35/44G is offered in a V-type version with 20 cylinders and an output of 10,600 kWm, (10,200 kWm). Its rated outputs – 530 kW per cylinder for 50 Hz power generation and 510 kW for 60 Hz power generation – give the 35/44G best-in-class power density among gas engines.


Fuel
In addition to a high supply reliability and the potential for savings in terms of operating and procurement costs, the advantage of gas-fired power plants lies chiefly in extremely low emissions coupled with a high level of efficiency. Due to the lower carbon content of the fuel, gas engines emit around 25% less CO2 than diesel engines. Nitrogen oxide (NOx) emissions are roughly 80% lower, while emissions of sulfphur oxides, soot, and particles are virtually non-existent.

Lean-burn concept
In a lean-burn gas engine, the mixture of air and gas in the cylinder is lean, that is, more air is present in the cylinder than is needed for complete combustion. With leaner combustion, the peak temperature is reduced and less NOx is produced. Higher output can be reached while avoiding knocking and increasing efficiency.


Advanced ignition technology
The ignition system comprises a capacitive discharge system and an ignition coil, which delivers the necessary high voltage via an ignition lead to the spark plug. To improve combustion, the spark plug is located in the pre-chamber.
Gas is precisely metered to the pre-chamber by means of a separate valve. In conjunction with the lean mixture from the main chamber, which is fed into the pre-chamber by the compression cycle, this creates a highly efficient, almost stoichiometric mixture. This is ignited using the spark plug, providing an ignition amplifier for the main chamber.

SaCoSone
The 35/44G engine is equipped with the safety and control system SaCoSone, which guarantees reliable engine operation with an optimum operation range between knocking and misfiring. All cylinders are regulated individually.
Cogeneration or combined cycle.


In addition to using thermal energy recovered from engine sources for heating or cooling in cogeneration or tri-generation applications, the exhaust heat of the 35/44G engine can also be used to produce steam to drive a steam turbine generator. As a result, the overall output and efficiency of the power plant can be increased without additional fuel costs.


Further major benefits:

  • Heat utilisation: > 90% total efficiency under general ISO conditions
  • Short power ramp up time: 100% load within 8 minutes
  • Ambient temperature compensation: ΔTair = 40 Kelvin without power de-rating
  • Easy maintenance and high availability
  • High safety standards
  • Excellent load response

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