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Exergetic and economic evaluation of the effect of HRSG configurations on the performance of combined cycle power plants

机译：对HRSG配置对联合循环电厂性能的影响进行的经济和经济评估

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In the present research study, the effect of HRSG pressure levels on exergy efficiency of combined cycle power plants is investigated. Hence, three types of gas turbine combined cycles, with the same gas turbine as a topping cycle are evaluated. A double pressure, and two triple pressure HRSGs (with and without reheat) are modeled. The results show how an increase in the number of pressure levels of the HRSG affect the exergy losses due to heat transfer in the HRSG and the exhaust of flue gas to the stack. Moreover, the results show that an increase in the number of pressure levels affects the exergy destruction rate in HRSG, and as a result, it causes a tangible increase in exergy efficiency of the whole cycle. The results from thermodynamic analysis show that the losses due to heat transfer in the HRSG and the exhaust of flue gas to the stack in a triple pressure reheat combined cycle are less than the other cases. From the economic analysis, it is found that increasing the number of pressure levels of steam generation leads to an increase for the total and specific investment cost of the plant for about 6% and 4% respectively. The net present value (NPV) of the plant increases for about 7% for triple pressure reheat compared to with the double pressure CCPP. Therefore, the results of economic analysis show that it is economically justifiable to increase the number of pressure levels of steam generation in HRSG.
机译：在本研究中，研究了HRSG压力水平对联合循环电厂火用效率的影响。因此，评估了三种类型的燃气轮机联合循环，其中燃气轮机与顶部循环相同。对双压力和两个三压力HRSG（带和不带再热）进行了建模。结果表明，HRSG压力水平数量的增加如何影响由于HRSG中的热传递和烟道气向烟囱排放而造成的本能损失。此外，结果表明，压力水平数量的增加会影响HRSG的火用破坏率，因此，它会导致整个循环的火用效率明显提高。热力学分析的结果表明，在三重压力再热联合循环中，HRSG中的热传递和烟道气向烟囱的排放所造成的损失要小于其他情况。从经济分析中发现，增加蒸汽产生压力的数量会导致工厂的总投资和特定投资成本分别增加约6％和4％。与双压CCPP相比，三压再热装置的净现值（NPV）增加了约7％。因此，经济分析的结果表明，增加HRSG中蒸汽产生压力水平的数量在经济上是合理的。

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