Engines & Components 

The 2011 “CHP Plant of the Year” generates power and heat using two MAN gas-powered engines

In two award-winning combined heat and power (CHP) plants from Kuntschar + Schlüter GmbH, MAN's highly efficient gas-powered engines deliver overall efficiency of up to ninety eight percent, supplying power and heat to meat processor Wilhelm Brandenburg in Dreieich, Germany.

The "CHP Plant of the Year" award for 2011 was bestowed by the trade magazine “Energie & Management” and the German CHP association, Bundesverband Kraft-Wärme-Kopplung (BKWK), in recognition of the contribution to the avoidance of electricity network expansion, high savings in energy costs and a significant reduction in CO2 emissions.

The natural-gas-powered MAN engines of type E2876 E312 in the two GTK140 CHP plants each deliver a power output of 140 kW and a thermal output of 207 kW. Even when operating at a partial load of fifty percent, the CHP plants with their in-line six-cylinder engines from MAN achieve an overall efficiency of more than 90 percent. Ingo Schlüter, general manager of system manufacturers Kuntschar + Schlüter, headquartered in Wolfhagen-Ippinghausen, sees the MAN engines as an important building block in the planning and design of the company's CHP plants: “We sell highly efficient CHP plants that our customers can rely on completely. This is why we in turn have for many years been relying on MAN engines with their long service lives and high levels of efficiency.”

Rapid amortisation

The two award-winning CHP units supply meat processor Wilhelm Brandenburg in Dreieich, Germany, with eight percent of its electricity and 15 to 20 percent of its heat requirements. The REWE supplier decided to deal with the energy bottleneck created by its own steady growth by implementing a comprehensive, long-term combined heat/power generation concept. The concept was developed by the Hamburg energy-trading company EHA Energie-Handels-Gesellschaft, with detailed planning executed by Gita Consult, Nidda. As Wilhelm Brandenburg’s energy service provider, EHA will manage the system.

The overall investment will be amortised within five years, thanks to the forty percent reduction in the cost of heat and the financial incentives of the German Combined Heat and Power Generation Act.

Flexibility in exhaust-gas aftertreatment

At the same time, the plant's two Lambda1 gas-powered engines from MAN will reduce CO2 emission by 266 tonnes per annum. MAN engines enable the downstream fitting of three-way catalytic converters, the optimum prerequisite for achieving the lowest emissions of 100 mg/Nm3 NOX by means of exhaust-gas aftertreatment. “In this way we are able to use catalytic exhaust-gas cleaning to do considerably better than the statutory limits, for example the 500 mg/Nm3 NOX laid down by TA Air for natural-gas-powered engines. Simultaneously, MAN engines convince with their well-known long service lives and low operating costs,” says Hubert Gossner, Sales Manager Gas and Diesel Engines in the Power segment of MAN Truck & Bus.

MAN's range of gas-powered engines for CHP plants

MAN Truck & Bus AG offers a number of low-pollutant gas-powered engines for operation in CHP plants, with outputs ranging from 37 kW to 420 kW at 1,500 rpm for 50-Hz applications powered by natural gas and from 68 kW to 380 kW for biogas versions. The MAN engines were especially developed to run on natural gas or biogas and are outstanding for their unbeatable reliability and highest energy efficiency. Thanks to their optimal combustion process they achieve top overall efficiency levels of more than ninety percent. MAN gas-powered engines have long proven themselves, combining robustness with long service lives at peak loads and in continuous operation in agricultural and municipal deployment, in hotels and hospitals and many other branches of industry. Lengthy maintenance intervals and long service lives mean low total cost of ownership (TCO).