Dual-Fuel Power For Gabon: Gabon government to receive four gen-sets, engine-related plant auxiliaries  by DJ Slater

MAN Diesel & Turbo and Telemenia, the Israeli power engineering company, have signed a contract for the supply of four generator sets and engine-related auxiliaries to the Gabon
government in Africa. The generator sets are powered by MAN Diesel & Turbo’s 18V 51/60DF engines, which are MAN’s first dualfuel engines in the region, said the company. The engines are available in a nine-cylinder, inline version as well as vee-configuration versions with 12, 14 and 18 cylinders.

The Gabonese government has ordered four generator sets driven by MAN Diesel & Turbo’s 51/60DF dual-fuel engines. The gen-sets are rated from 8.5 to 17.5 MW.

The engines come with a fourstroke cycle and a constant pressure turbocharging system. They are rated at 1 MW per cylinder for 60 Hz power generation and 975 kW for 50 Hz applications. These ratings give the generator sets a rating range from 8.5 to 17.5 MW. The total output of the four engines is about 70 MW.

Each engine features a 510 mm bore with a 600 mm stroke. Cooling is provided by a freshwater, singlestage cylinder cooling system and a two-stage charge-air cooler. The engines run on natural gas with a fuel-oil mode acting as a backup in case the gas supply is disrupted. The engine’s fuel flexibility allows it to switch between gas and liquid fuel at full-rated output, according to MAN Diesel & Turbo.

In the gas-fuel mode, an air-gas mixture gets ignited by injecting distillate diesel fuel. The liquid fuel micropilot amounts to 1% of the quantity of liquid fuel needed to obtain its fullrated output. The mixture is injected through a common rail system that allows a flexible setting of injection timing, duration and pressure for each cylinder. This flexibility allows the engine to achieve low emissions and to respond quickly to combustion knock signals on a cylinder-by-cylinder basis, MAN Diesel & Turbo said.

In liquid fuel mode, the engine operates as a regular diesel engine injecting distillate or heavy fuel oil through a separate injection in a camshaft-actuated, pump-line-nozzle system. This process allows the engine to NOx emissions that are in compliance with Germany’s TA Luft clean air regulations and the World Bank Pollution and Abatement Handbook.

MAN Diesel & Turbo has been focusing more of its attention on Africa. Over the past three years, the company has received orders across the continent in Egypt, Sudan, Senegal, Burkina Faso, Libya, Madagascar and Cape Verde. The company also has an office in Africa, MAN PrimeServ Nairobi, which opened its doors in November 2009.

The Gabonese government isn’t the only entity that’s ordered MAN Diesel & Turbo’s dual-fuel engine. The Owen Springs power plant near Alice Springs in Australia’s Northern Territory has three 10.9 MW generator sets, each powered by 12-cylinder, vee-configuration 12V 51/60DF engines. The generator sets will supply base load power to the local grid.

The generator sets for the Gabonese order are set to be delivered later this year or early next year at a power plant on a site in Libreville, Africa. The plant is expected to go into operation in 2011 and provide power to the area’s 1.2 million residents.


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