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Engines for generators

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Engines for generators

Engines for generators

The new Gas engine from Dewerk  is a four-stroke, spark-ignited gas engine operating on the Otto cycle and incorporating the lean-burn principle.

An important feature of this new gas engine in DEWERK portfolio is its exceptionally high power plant net electrical efficiency rating - more than 53% in combined-cycle mode.

Engine working principle of spark-ignited engines (DS)

The DS 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 pre chamber, 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 pre chamber is ignited by a spark plug. The flames from the nozzle of the pre chamber ignite the gas/air mixture in the whole cylinder. After the working phase the cylinder is emptied of exhaust and the process starts again.

The processes are described by:

http://upload.wikimedia.org/wikipedia/commons/c/cf/P-V_otto.png

 
 

 

 

·         Process 0-1 a mass of air is drawn into piston/cylinder arrangement at constant pressure.

·         Process 1-2 is an adiabatic (isentropic) compression of the air as the piston moves from bottom dead centre (BDC) to top dead centre (TDC).

·         Process 2-3 is a constant-volume heat transfer to the working gas from an external source while the piston is at top dead centre. This process is intended to represent the ignition of the fuel-air mixture and the subsequent rapid burning.

·         Process 3-4 is an adiabatic (isentropic) expansion (power stroke).

·         Process 4-1 completes the cycle by a constant-volume process in which heat is rejected from the air while the piston is at bottom dead centre.

·         Process 1-0 the mass of air is released to the atmosphere in a constant pressure process.

 

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