Combined cycle plant efficiency increase based on the optimization of the heat recovery steam generator operating parameters

Franco, Alessandro; Russo, A.

doi:10.1016/s1290-0729(02)01378-9

Cited by 130 publications

(70 citation statements)

References 4 publications

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“…The water-pressure reduction can be decreased by increasing the number of parallel lines in each heat exchanger. Such calculations are in a lower hierarchical order of optimization [24] and are therefore not covered in this paper. Because of the large number of objective-function calculations required, which reaches several hundred thousand for just one optimization, the mathematical model must be simplified as much as possible in order to perform the optimization in real time and obtain physically feasible solutions.…”

Section: Mathematical Modelmentioning

confidence: 99%

Novel method for determining optimal heat-exchanger layout for heat recovery steam generators

Čehil

Katulić

Schneider

2017

Energy Conversion and Management

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a b s t r a c tA new method for determining the optimal heat-exchanger layout in a heat recovery steam generator and its operating parameters are presented in this paper. A robust mathematical model is developed, where arbitrary steam-pressure levels and steam-reheating levels can be set. The method considers all the possible heat-exchanger layouts, in both serial and parallel arrangements of steam pressure levels or steam reheating levels. The maximum thermodynamic efficiency of the steam-turbine cycle is set as the objective function. The results show that the optimal high pressure in heat recovery steam generator without reheating is in the region of subcritical pressures, whereas that for a heat recovery steam generator with reheating is in the region of supercritical pressures. In the case of similar water or steam temperature profiles in the heat exchangers of different steam pressure levels or reheating level, from a thermodynamic viewpoint, it is justified to use a parallel heat-exchanger arrangement.

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Section: Mathematical Modelmentioning

confidence: 99%

Novel method for determining optimal heat-exchanger layout for heat recovery steam generators

Čehil

Katulić

Schneider

2017

Energy Conversion and Management

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“…In the current analysis kinematic and potential exergies have been ignored. Using first and second laws of thermodynamics, general exergy equation can be written as follows [10]- [16]:…”

Section: F Steam Turbinementioning

confidence: 99%

“…Amount of fuel exergy is shown by ̇ . Combined cycle exergy and HRSG efficiencies are defined as follows [10]: …”

Section: F Steam Turbinementioning

confidence: 99%

“…Franco A. and Russo A. (2002) believed that by optimizing effective parameters on HRSG and using different HRSGs along with decreasing pinch temperature and increasing levels of heat absorption in the boiler, higher efficiency and power can be obtainable [10]. Backlund J. C. and Batshon A. introduced the advantages and disadvantages of duct burner and studied using irregular fuels such as the gas produced from sewers, steel plants furnaces, decomposition of solid urban wastes…in the duct burner [11].…”

Section: Introductionmentioning

confidence: 99%

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Using Double Pressure Heat Recovery Steam Generator Equipped with Duct Burner for Full Repowering a Steam Power Plant and Its Analysis by Exergy Method

Rohani¹,

Ahmadi²

2014

IJMMM

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Abstract-Repowering is defined as adding gas turbine unit(s) to steam cycle and using exhaust gases to increase cycle efficiency. Repowering methods are divided into two main ways: full repowering and partial repowering. In this research Be'sat steam power plant in Tehran has been considered as reference steam power plant. This old power plant has been designed by General Electric Corporation with 31.46% efficiency, whereas its current efficiency is 26.81%. In this research by using full repowering a combined cycle have been designed with double pressure heat recovery steam generator equipped with duct burner and through exergy analysis, the functional parameters of the repowered cycle has been studied in the two states of no duct burner and various modes with duct burner (in terms of the fuel flow feed to duct burner). The results showed that thermal and exergy efficiencies for repowered cycle at without duct burner state are 44.39%, 43.06 % respectively and in other states of using burner in general state thermal and exergy efficiencies are higher than reference cycle. It has been shown by results that in repowered cycle combustion chamber in the gas section and HRSG in the steam section have the highest exergy losses. Also The results showed that by using duct burner and increasing the feed fuel, in general state thermal and exergy efficiencies of repowered cycle, decrease and the temperature of the exhaust gas from stack and the exergy losses by it, the generated steam flow and the generation power increases.Index Terms-Efficiency, exergy analysis, full repowering, heat recovery steam generator.

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“…Heat-pipe heat exchanger plays an important role in enhancing the performance of various industrial processes [1][2][3] for different kinds of purposes. In this heat recovery plan, the recovered energy is utilized to preheat the fuel gas used for hot stove combustion.…”

Section: Bfgmentioning

confidence: 99%

Efficiency improvement of the hot blast generating system by waste heat recovery

Lin¹,

Wang²,

Hui-TienChen³

et al. 2007

WIT Transactions on Ecology and the Environment, Vol 105

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To meet the increasing demand for energy saving and sustainable CO 2 reduction, a heat-pipe heat exchanger has been applied in the hot blast generating system to recover the flue gas sensible heat for the purpose of fuel gas preheating. In this paper, the performance evaluation method for the hot blast generating system is proposed and used to investigate the fuel gas preheating effect on the system's thermal efficiency. Experimental observation revealed that 3.1% of the efficiency improvement was achieved by the application of waste heat recovery. Accordingly, the energy consumed to enhance the blast air temperature was diminished by 0.115 kJ/°C-Nm 3 . In addition to energy saving, the fuel gas preheating also led to the reduction of the enrichment gas depletion rate. Based upon the field test results, the records indicated that the implementation of the flue gas heat recovery scheme in the hot blast generating process resulted in a saving of fuel consumption by 822 l/h on an oil equivalent basis. The benefits of energy saving over 1.9 million US dollars and the CO 2 reduction 15,000 tons can be achieved annually.

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Combined cycle plant efficiency increase based on the optimization of the heat recovery steam generator operating parameters

Cited by 130 publications

References 4 publications

Novel method for determining optimal heat-exchanger layout for heat recovery steam generators

Novel method for determining optimal heat-exchanger layout for heat recovery steam generators

Using Double Pressure Heat Recovery Steam Generator Equipped with Duct Burner for Full Repowering a Steam Power Plant and Its Analysis by Exergy Method

Efficiency improvement of the hot blast generating system by waste heat recovery

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