This work presents a computer code developed to simulate off-design operation of single-pressure steam powerplants in gas-steam combined cycles. Off-design control techniques such as inlet air throttling, varying the inlet guide vane and the mass fuel rate, compressor mass bleeding, and outlet mass recirculation, were examined with constant and varying boiler pressures at varying steam flow rates. The test steam cycle was comprised of a heat recovery boiler (HRB), steam turbine, condenser, and feed pump. The HRB was modelled computing the heat transfer surface and gas- and steam-side pressure drops so that the HRB performance could be accurately determined with varying gas turbine exhaust gas flow rates and temperatures. The efficiency of the steam turbine was computed in relation to variations in the steam flow rate and the temperature and pressure inlet conditions. The effects of the different exhaust gas flow rates and temperatures produced by the control systems on overall steam cycle performance were evaluated through simulation.
A Simplified Approach to Off-design Performance Evaluation of Combined Cycle Powerplants with Single Pressure Steam Cycles
DESIDERI, UMBERTO;
1993-01-01
Abstract
This work presents a computer code developed to simulate off-design operation of single-pressure steam powerplants in gas-steam combined cycles. Off-design control techniques such as inlet air throttling, varying the inlet guide vane and the mass fuel rate, compressor mass bleeding, and outlet mass recirculation, were examined with constant and varying boiler pressures at varying steam flow rates. The test steam cycle was comprised of a heat recovery boiler (HRB), steam turbine, condenser, and feed pump. The HRB was modelled computing the heat transfer surface and gas- and steam-side pressure drops so that the HRB performance could be accurately determined with varying gas turbine exhaust gas flow rates and temperatures. The efficiency of the steam turbine was computed in relation to variations in the steam flow rate and the temperature and pressure inlet conditions. The effects of the different exhaust gas flow rates and temperatures produced by the control systems on overall steam cycle performance were evaluated through simulation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
