GENSET/ Roundup

MAN B&W launches plug-free gas engine

MAN B&W Diesel has developed a revolutionary ignition system for its 32/40-gas engine, which does away with the need for spark plugs. The new 32/40PGI model is designed for stationary applications and incorporates the Performance Gas Injection system. It combines the advantages of a diesel engine such as high power density and high efficiency with the benefits of a gas engine such as lower emissions.

The MAN B&W Diesel four-stroke gas engine 12V32/40PGI in the Augsburg power house
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In the PGI process a small amount of ignition gas is injected into a pre-chamber separate from the main combustion chamber. The fuel ignites on a hot surface, which in turn initiates the ignition of a lean air-gas mixture in the combustion chamber. The 32/40 is capable of high efficiencies in excess of 46 per cent, in combination with NOx emissions of less than 250 mg/Nm3 at five per cent O2.

The engine has been secretly operating under full test conditions since last year, providing both electricity and heat to the MAN B&W Diesel plant in Augsburg, Germany. It took five years to develop the engine from original sketch to prototype but one of the men who originated the concept, senior vice president of MAN B&W Diesel Prof. Wolfram Lausch, believes the technology is unbeatable. “Customers will soon recognize the benefits of this engine and some will use it to replace diesel engines and will be able to earn emissions credits as a result,” said Lausch. “I am optimistic that the 32/40PGI will penetrate the gas engine market. Engine manufacturers have been making gradual improvements but this represents a jump in technology.”

Cylinder head with high pressure gas injector and glow plug
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The problem of spark plug maintenance is well known in the industry. Plugs have to be changed at regular intervals (1000-2000 running hours) with a resulting outage. The use of leaner gas/air mixes improves emissions performance but puts more strain on spark plugs. Other alternatives to spark plugs in gas engines such as a micro-pilot system using diesel fuel has meant the need for a duel fuel system. The 32/40PGI is the first to apply a monofuel system on a gas engine operating on the Otto principal.

MAN B&W estimates that the new engine can improve ROI by 1-3 years by extending maintenance intervals and through improved fuel efficiency.

MTU launches Series 4000 diesel engines

MTU Friedrichshafen has introduced its Series 4000 diesel genset engines. The new engines achieve NOx values below 1700 mg/m3 and are said to undercut the previous version by 15 per cent. These NOx levels are achieved without exhaust after-treatment.

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The new engines also reduce particulate emissions to below 50 mg/m3 and at less than 300 mg/m3 of exhaust gas, carbon monoxide values are less than half that of the previous version.

Depending on the cylinder configuration, the new engines produce 1910 kW, 2500 kW or 3490 kW. The new engines are more compact than before. For an electrical output of 1800 kVA, for example, the more powerful 12-cylinder engine can now be used in place of the previous 16 V 4000. The new 16V is now capable of 2250 kVA prime power, replacing the previous 20V 4000 in this slot.

The new engines also feature MTU’s latest generation of electronic management system ADEC (Advanced Diesel Engine Control). Remote access to engine and plant data via the internet means, for example, that information such as the number of operating hours can be read out or, for servicing purposes, copied to a new engine governor.

The new Series 4000 will go into production in Germany in July this year for the 50 Hz version, and in December in Detroit for the 60 Hz version.

Aggreko wins Yemen contracts

Aggreko plc has signed a two-year contract with Yemen’s state-owned Public Electricity Corporation for the supply of 50 MW of generating capacity to support the country’s rapidly developing economy.

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In Yemen, where power demand is estimated to grow between 7 and 10 per cent annually, the country has been faced with shortages. While purchase of generators by individual companies to meet business requirements is not unusual in Yemen, this is the first time the state authority has undertaken to hire a private company to support the grid and meet the nation’s growing power requirements.

Equipment for the contract will be transported from Aggreko’s regional headquarters in Jebel Ali, Dubai. Generating capacity will be operational in May 2006 ahead of the country’s annual celebration of Yemen Reunification Day on May 22, to commemorate the merger of North and South Yemen.

This two-year contract was won following a competitive public tender. Commenting on the contract, Dr. Ali Mohamed Mujawar – Minister of Electricity, said: “As Yemen pursues its plan of economic reform, it requires the support of a strong infrastructure. The contract with Aggreko will enable us to move ahead with our plans. Aggreko won the contract because of its commitment to having the equipment for contract delivered to the site and on-line in the time frame required.”

According to James Shepherd – Area Director Middle East, Aggreko, equipment for the contract will be installed in four sites in the Red Sea town of Al Hudaydah, 232 km from the capital Sana’a. “The power would immediately be required for the reunification ceremony after which it will be used to support the grid as it can be exported from Aggreko’s 11 kV system to the 132 kV system of Yemen’s national grid.”

In a separate contract Aggreko announced that it has signed a contract with Groupement Sonatrach – Agip for the provision of a 4 MW / 5.5 kV temporary power package to a remote oil pumping station in the Algerian Sahara Desert.

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