COMPARE - STEAM ENGINES – STEAM TURBINES

UNIT COSTS	STEAM ENGINE	STEAM TURBINE
1000 kW Depend on the Pressure ratio between the inlet pressure and outlet pressure, the steam flow ratio, superheating and temperature	The steam engine is a little clearer, but principally the same problem, smaller Steam engines start with approx. 250,000 Euro and electrical outputs of say 120 to 200 kW. Medium sized steam engines 250 kW – 500 kW are in the range of say 300,000 Euro. The 900 to 1200 kW engines are somewhere around 600,000 Euro	The 1000kW turbine can be very simple but with lower electrical efficiency and costs of say: 450,000 Euro It can also be very efficient but more complex and costs say 700.00 Euro
COMPARISON	STEAM ENGINE ADVANTAGES	STEAM TURBINE ADVANTAGES
The costs for the turbine tend to be lower that that for steam engine from approx,800 to 1200 kW From the technical issue both systems have their advantages for different applications	Their good regulation behaviour and their good part load efficiency Very good where fast changes of electrical load are required Lower requirements for water treatment / steam quality More robust in the case of mal/operation /damage is generally smaller than turbines The life cycle can be as high as 30 years or more with good maintenance	They can operate with higher superheated steam-> higher electrical efficiency They can expand into the vacuum - > higher electrical efficiency, but then most times loss of CHP from the exhaust heat Lower maintenance costs Lower investments costs for power ranges higher than say 1200 kW
MANITENANCE TIME	STEAM ENGINE	STEAM TURBINE
	The steam Engine requires at least 4 stops per year for inspections and maintenance 1 to 6 days depending on the number of cylinders Altogether between 8 and 15 days per year	The turbine requires normally only one maintenance per year 3 to 6 days
HEAT CONTENT VS ELECTRICAL OUTPUT	STEAM ENGINE	STEAM TURBINE
	As described above the electrical output of the steam engine depends on Inlet steam pressure / temperature Outlet pressure Steam flow rate Design of the engine Single stage Multi stage Elect. Calculated Separately	As described above the electrical output of the steam turbine depends on Inlet steam pressure / temperature Outlet pressure Steam flow rate Design of the engine Single stage Multi stage Elect. Calculated Separately

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