Modeling, numerical optimization, and irreversibility reduction of a triple-pressure reheat combined cycle

被引:62
作者
Bassily, A. M. [1 ]
机构
[1] Frederick Inst Technol, Dept Mech Engn, CY-1036 Nicosia, Cyprus
关键词
gas turbine combined cycle; improving efficiency; optimized combined cycle; reduced irreversibility; steam generator;
D O I
10.1016/j.energy.2006.04.017
中图分类号
O414.1 [热力学];
学科分类号
摘要
The main methods for improving the efficiency of the combined cycle are: increasing the inlet temperature of the gas turbine (TIT), reducing the irreversibility of the heat recovery steam generator (HRSG), and optimization. In this paper, modeling and optimization of the triple-pressure reheat combined cycle as well as irreversibility reduction of its HRSG are considered. Constraints were set on the minimum temperature difference for pinch points (PPm), the temperature difference for superheat approach, the steam turbine inlet temperature and pressure, the stack temperature, and the dryness fraction at steam turbine outlet. The triple-pressure reheat combined cycle was optimized at 41 different maximum values of TIT using two different methods; the direct search and the variable metric. A feasible technique to reduce the irreversibility of the HRSG of the combined cycle was introduced. The optimized and the reduced-irreversibility triple-pressure reheat combined cycles were compared with the regularly designed triple-pressure reheat combined cycle, which is the typical design for a commercial combined cycle. The effects of varying the TIT on the performance of all cycles were presented and discussed. The results indicate that the optimized triple-pressure reheat combined cycle is up to 1.7% higher in efficiency than the reduced-irreversibility triple-pressure reheat combined cycle, which is 1.9-2.1% higher in efficiency than the regularly designed triple-pressure reheat combined cycle when all cycles are compared at the same values of TIT and PPm. The optimized and reduced-irreversibility combined cycles were compared with the most efficient commercially available combined cycle at the same value of TIT. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:778 / 794
页数:17
相关论文
共 38 条
[1]  
BASSILY A, 1999, P REN ADV EN SYST 21
[2]   Modeling, numerical optimization, and irreversibility reduction of a dual-pressure reheat combined-cycle [J].
Bassily, AM .
APPLIED ENERGY, 2005, 81 (02) :127-151
[3]   Modelling and numerical optimization of dual- and triple-pressure combined cycles [J].
Bassily, AM .
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY, 2004, 218 (A2) :97-109
[4]   Performance improvements of the intercooled reheat recuperated gas-turbine cycle using absorption inlet-cooling and evaporative after-cooling [J].
Bassily, AM .
APPLIED ENERGY, 2004, 77 (03) :249-272
[7]   Effects of evaporative inlet and aftercooling on the recuperated gas turbine cycle [J].
Bassily, AM .
APPLIED THERMAL ENGINEERING, 2001, 21 (18) :1875-1890
[8]  
Bolland O., 1990, P INT GAS TURB AER C
[9]  
BOLLAND O, 1990, THESIS TRONDHEIM U T
[10]  
Boswell M., 1993, Power, V137, p65, 68