SUMMARYA design method is presented based on pinch technology and exergy analysis to reduce heat transfer irreversibility of the feedwater heaters network in steam power plants. In order to show the effects of this method, an extensive study was performed on four steam power plants. The results show that applying this method can decrease the fuel consumption and the condenser load. It also increases the boiler, the feedwater heaters network, and the turbine exergetic efficiencies. On the whole, the results show that applying this method, with a target pinch temperature of 38C, increases the cycle 2nd law efficiency 0.3-1.3% and the fossil fuel consumption decreases about 64 Â 10 6 kg annually for 8000 operating hours per year of the studied steam power plants.
The purpose of this paper is to show how the ASME performance test codes can be used as a low cost and efficient tool for energy survey in order to reduce fuel and power consumptions in operating steam power plants. In this regard, A 1000 MW steam power plant was selected and many studies were performed to evaluate the possibility and effects of performing such tests on this power plant. The results show that many of the instruments of this plant are suitable for the desired purpose and the tests can be applied for achieving energy saving. Also, the results show that the natural gas and heavy oil fuel consumptions have increased around 10 and 8.3 percent, respectively, relative to the design conditions of this plant and at least half of these increases can be reduced by proper adjustments of control devices and simple repairs.
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