Thermodynamic modelling and optimization of a dual pressure reheat combined power cycle

In advanced combined-cycle power plants, significant improvements in the thermodynamic performance are mainly achieved by the development of more efficient gas-turbine systems. This paper evaluates the effect of selected decision variables in the steam system for optimization of Thermal Combined Cycle Gas Turbine (TCCGT) power plant using an iterative exergoeconomic. The design variables were the thermodynamic parameters that establish the configuration both of the steam and gas systems. The design data of an existing plant (Damavand power plant in Tehran-Iran) is used. Two different objective functions are proposed: one minimizes the total cost of production per unit of output, and the other maximizes the total exergetic efficiency. The analysis shows that the total cost of production per unit of output is 2% lower and exergy efficiency is 4% higher with respect to the base case. It demonstrates that selected decision variables have suitable results for the exergy analysis and cost effectiveness. Since, environmental pollution and energy shortage are the two factors limiting the development of the society; nevertheless, this analysis tends to optimally find the design parameters which result in a decrease in the fuel mass flow rate. Also, this reduction (about 5%) in the mass flow rate and increasing exergetic efficiency can decrease the environmental impacts.

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“…The thermodynamic properties of air and steam were found using the Engineering Equation Solver (EES) software package. [3,15,19]…”

Section: Case Study 21 Thermodynamic Modeling and Analysismentioning

confidence: 99%

Effect of Decision Variables in the Steam Section for the Exergoeconomic Analysis of TCCGT Power Plant: A Case Study

Abdalisousan

Fani

Farhanieh

et al. 2014

Energy & Environment

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“…Srinivas 1 studied a double pressure water tube HRSG in order to maximize the heat recovery and improve the CCPP performance. Each of the heating section in HRSG is solved from the local flue gas condition with an aim of getting minimum possible temperature difference.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of finless and finned tube heat recovery steam generators for cogeneration plants

Ghaffari

Ahmadi

Eyvazkhani

2020

Engineering Reports

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This article aims to model and optimize the fire tube Heat Recovery Steam Generator (HRSG) used in a gas microturbine cogeneration of heat and power system. Here, six cases including a finless and finned tube (solid and serrated) HRSGs with the inline and staggered arrangements are optimized and compared using techno-economic assessment. Optimization of HRSG was carried out by applying two objective functions of minimizing the total annual cost as well as maximizing the exergy efficiency. Nondominated Sorting Genetic Algorithm II is used to find out the optimal values of design variables. The TOPSIS decision-making process is employed to choose the optimum point of the Pareto front. A 600 kW gas microturbine cogeneration plant is considered as a case study. The results revealed that the finless tube HRSG with an inline arrangement has the lower pinch and approach temperatures (3.5 • C and 3.1 • C, respectively), the higher steam mass flow rate (12.7%), the lower total annual cost (64 096$/year), and the higher exergy efficiency (60.6%). It is also found that using the staggered arrangement tube banks along with the solid fins in HRSG leads the total annual cost, the steam mass flow rate, and exergy efficiency increase up to 41.6%, 100%, and 12.6%, respectively. This means that the thermodynamic performance improvement will compensate the total annual cost increment. Furthermore, it is demonstrated that HRSG with solid fins and staggered arrangement with total annual costs of (90 810$/year), exergy efficiency of (73.2%), and steam mass flow rate of (4680 kg/h) has the best performance in comparison with other finned tube cases. K E Y W O R D S cogeneration of heat and power systems, gas microturbine, genetic algorithm, heat recovery steam generator, inline and staggered arrangement, multiobjective optimization 1 INTRODUCTION In combined heat and power (CHP) systems, the prime mover waste heat is recovered to produce hot water/steam for heating or power generation. Heat recovery along with power generation, increases the efficiency of CHP systems up to This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…With integration of these two plants, it is possible to overcome these limitations . Some of the advances and approaches for CC power plant augmentation are biomass power and cooling integration , parametric optimization , multi pressure heat recovery steam generator (HRSG) , fuel reforming , water injection/steam injection in combustion , power boosting by supplementary firing (SF) , CO 2 capture, air cooling , humidification of air turbine and coal gasification . Natural gas can be directly fired into gas turbine combustion chamber and a solid fuel can be burned directly in SF or partial oxidation of solid fuel can be used in an integrated gasification combined cycle (IGCC) oxidation .…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of augmentation in combined cycle power plants

Srinivas

Reddy

2013

Int. J. Energy Res.

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SUMMARYThe attractive features of a combined cycle (CC) power plant are fuel flexibility, operational flexibility, higher efficiency and low emissions. The performance of five gas turbine‐steam turbine (GT‐ST) combined cycle power plants (four natural gas based plants and one biomass based plant) have been studied and the degree of augmentation has been compared. They are (i) combined cycle with natural gas (CC‐NG), (ii) combined cycle with water injection (CC‐WI), (iii) combined cycle with steam injection (CC‐SI), (iv) combined cycle with supplementary firing (CC‐SF) and (v) combined cycle with biomass gasification (CC‐BM). The plant performance and CO2 emissions are compared with a change in compressor pressure ratio and gas turbine inlet temperature (GTIT). The optimum pressure ratio for compressor is selected from maximum efficiency condition. The specific power, thermal efficiency and CO2 emissions of augmented power plants are compared with the CC‐NG power plant at the individual optimized pressure ratios in place of a common pressure ratio. The results show that the optimum pressure ratio is increased with water injection, steam injection, supplementary firing and biomass gasification. The specific power is increased in all the plants with a loss in thermal efficiency and rise in CO2 emissions compared to CC‐NG plant. Copyright © 2013 John Wiley & Sons, Ltd.

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Thermodynamic modelling and optimization of a dual pressure reheat combined power cycle

Cited by 14 publications

References 15 publications

Effect of Decision Variables in the Steam Section for the Exergoeconomic Analysis of TCCGT Power Plant: A Case Study

Effect of Decision Variables in the Steam Section for the Exergoeconomic Analysis of TCCGT Power Plant: A Case Study

Modeling and optimization of finless and finned tube heat recovery steam generators for cogeneration plants

Comparative studies of augmentation in combined cycle power plants

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