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

Mansouri, Mohammad; Ahmadi, Pouria; Kaviri, Abdolsaeid Ganjeh; Jaafar, Mohammad Nazri Mohd.

doi:10.1016/j.enconman.2011.12.020

Cited by 115 publications

(35 citation statements)

References 22 publications

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“…Whilst typical "natural gas" is not composed of 100% methane (Mansouri et al 2012), and could potentially contain as little as 89% CH 4 , a typical value is approximately 97%. Therefore, the following reactions were included in our model:…”

Section: Combustion Chambermentioning

confidence: 99%

Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

Adams

Dowell

2016

Applied Energy

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The use of natural gas for power generation is becoming increasingly important in many regions in the world. Given that the combined cycle gas turbine (CCGT) power stations are lower in capital cost and carbon intensity than their coal-fired counterparts, natural gas fired power stations are considered a vital part of the transition to a low carbon economy. However, CCGTs are not themselves "low carbon" and in order to reach a carbon intensity of less than 50 kg CO2 /MWh, it will be necessary to decarbonise them via CCS, with postcombustion CCS currently regarded as being a promising technology for this application. In this study, we present a detailed model of a 420 MW triple-pressure reheat CCGT and evaluate its technical and economic performance under full and part load conditions. We evaluate the technical performance of our CCGT model by comparison to an equivalent model implemented in Thermoflow THERMOFLEX and observe agreement of power output and efficiency to within 4.1% and the temperature profile within the HRSG within 2.9%. We further integrate the CCGT with a dynamic model of an amine based CCS process, and observe a reduction in the base plant efficiency from 51.84% at full-load and 50.23% at 60% load by 8.64% points at full-load and 7.93% points at 60% load. A core conclusion of this paper is that CCGT power plants equipped with post-combustion CCS technologies are well suited to dynamic operation, as might be required in an energy system characterised by high penetrations of intermittent renewable power generation.

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Section: Combustion Chambermentioning

confidence: 99%

Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

Adams

Dowell

2016

Applied Energy

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“…In order to prevent this, in boilers design, the T=361°K is taken as the acid dew point of gas mixture to save the temperature of the gas that exit from boilers from lowering that point [8]- [12].…”

Section: Reference Cycle Specificationsmentioning

confidence: 99%

“…REPOWERED CYCLE Using reference cycle and its related information a double pressure combined cycle are considered for full repowering. In these cycle natural gas has been used as fuel which its composition is presented in Table II [2]- [8]. Used turbine specifications are presented in the Table III.…”

Section: F Steam Turbinementioning

confidence: 99%

“…Using another method of repowering Mehrpanahi A. and Hoseinalipoor S. M. (2011) have optimized parallel feed water heat recovery for Shahid Rajaei power plant in Tehran to decrease electricity generating costs [7]. In another research Tajik Mansouri M. and Ahmadi P. (2012) have evaluated and compared three types of HRSG used in combined cycles to analyze effect of vapor pressure level enhancement in power and efficiency increase and reduction in combined cycles exergy destruction [8]. Bassily M. (2008) has been investigated power and efficiency enhancement using a HRSG triple pressure.…”

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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“…They only optimized the working parameters. Tajik Mansouri et al [12] studied different configurations of HRSGs with two and three pressure levels and the same gas turbine as the topping cycle (Brayton cycle) and evaluated the exergy efficiency of each configuration. Rovira et.…”

Section: Introductionmentioning

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

Cited by 115 publications

References 22 publications

Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

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

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

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