Abstract
The paper presents an analysis of two steam turbine operation regimes - regime with all steam extractions opened (base process) and regime with all steam extractions closed. Closing of all steam extractions significantly increases turbine real developed power for 5215.88 kW and increases turbine energy and exergy losses with simultaneous decrease of turbine energy and exergy efficiencies for more than 2%. First extracted steam mass flow rate has a dominant influence on turbine power losses (in comparison to turbine maximum power when all of steam extractions are closed). Cumulative power losses caused by steam mass flow rate extractions are the highest in the fourth turbine segment and equal to 1687.82 kW.
Highlights
Steam turbines are integral components of steam power plants of any kind
Along with the turbine power increase, closing of all steam extractions simultaneously increases analyzed turbine energy and exergy losses - energy losses increase for 4901.73 kW while exergy losses increase for 4748.09 kW, Fig. 3
Closing of all steam turbine extractions has a higher influence on turbine energy losses, which increase is higher in comparison to exergy losses
Summary
Steam turbines are integral components of steam power plants of any kind (land based [1,2,3] or marine steam power plants [4, 5]). In the most of the cases its main function is electricity production (or ship propulsion in marine steam power plants) [6, 7]. Steam turbine processes are inevitable components of combined [9,10,11], cogeneration [12, 13] or multi-generation power systems [14, 15]. Low power steam turbines are used for several auxiliary purposes (for pumps drive [16, 17], for the drive of additional (or main) electrical generators [18], etc.). Cumulative turbine power losses and turbine power losses in each turbine segment caused by steam extractions are calculated and discussed
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