Analysis of Low-Power Steam Turbine With One Extraction for Marine Applications

摘要

The paper presents thermodynamic (energy and exergy) analysis of low-power steam turbine with one extraction for marine applications. Analyzed steam turbine is divided in two parts - High Pressure (HP) part before steam extraction and Low Pressure (LP) part after steam extraction. Analysis shows that HP turbine part produces the majority of cumulative turbine power and consequentially has higher mechanical, energy and exergy losses when compared to LP turbine part. Regardless of heavier operating conditions, LP turbine part has higher efficiencies and lower specific losses (in both energy and exergy analysis) when compared to HP turbine part. Whole analyzed turbine has energy and exergy efficiencies equal to 62.84% and 65.58%, while energy and exergy turbine losses are 696.74 kW and 618.50 kW. Cumulative produced power at the turbine shaft outlet is equal to 1178.40 kW. Steam extraction which divides analyzed turbine on HP and LP part can deliver a notable amount of heat to any marine heat consumer, what represents a significant advantage of observed turbine in comparison with similar low-power marine steam turbines which usually does not have steam extractions.