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Energetic and Exergetic Optimization of a Combined Cycle Power Plant with Dual-Pressure HRSG, Compressed Air Cooling, Steam Injection and Vapor Extraction Systems

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

An energetic and exergetic optimization is conducted on a combined cycle power plant of net power of 400 MW. This power plant is equipped with dual-pressure heat recovery steam generator, compressed air cooling, steam injection and vapor extraction systems. Energy and exergy balances are established on the different components of the cycle. The selected objective function is to increase the energy efficiency and reduce the exergy losses. A code is established using the Engineering Equation Solver software in order to perform the required calculations. The effects of the main operating conditions, such as ambient temperature, pressure ratio, air excess ratio, steam injection ratio and extracted steam pressure, on the power plant performances are analyzed taking into consideration the local environmental conditions. Obtained results show that the ambient temperature affects significantly the overall thermal efficiency of the combined cycle. The maximum energy efficiency is obtained for an optimal pressure ratio of about 14, medium and low pressure of 45 and 4 bars, respectively. The air excess and the steam injection ratios should be carefully defined to better the control of cycle performances. The combustion chamber is a major contributor of exergy destruction followed by the heat recovery steam generator. Compared to a standard combined cycle, the selected design characteristics have enabled the overall energy and exergy efficiencies to be enhanced about 11.7 and 10%, respectively.

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Abbreviations

Alt:

Alternator

CC:

Combined cycle

Comp:

Compressor

E :

Exergy (kJ/kg)

EcoHP:

High-pressure economizer

EcoMP:

Medium-pressure economizer

EvapHP:

High-pressure evaporator

EvapMP:

Medium-pressure evaporator

FWH1:

Feed water heater 1

FWH2:

Feed water heater 2

GT:

Gas turbine

h :

Enthalpy (kJ/kg)

HP:

High pressure (bar)

HPST:

High-pressure steam turbine

HPpump:

High-pressure pump

HRSG:

Heat recovery steam generator

Inj:

Injection

LHW:

Low heating value (kJ/kg)

LP:

Low pressure (bar)

LPST:

Low-pressure steam turbine

LPpump:

Low-pressure pump

\(\dot{m}\) :

Mass flow (kg/s)

MP:

Medium pressure (bar)

MPpump:

Medium-pressure pump

MPST:

Medium-pressure steam turbine

SupMP:

Medium-pressure superheater

Q :

Heat (kJ/kg)

ST:

Steam turbine

SupHP:

High-pressure superheater

T :

Temperature (K)

TIT:

Turbine inlet temperature

\(\dot{W}\) :

Power (W)

η :

Efficiency references

air excess:

Air excess ratio (kg/s)

amb:

Ambient condition

ch:

Chemical

comb:

Combustion

cond:

Condenser

cooling:

Cooling system

dest:

Destruction

e′:

Standard chemical exergy (kJ/kg mol)

Ex:

Exergetic

gas:

Gas mixture

ph:

Physic

s :

Entropy (kJ/kg K)

steam inj:

Steam injection ratio (kg/s)

ΔT :

Thermal

ε :

Specific exergy (kJ/kg)

1, 2, 3…:

State points in the cycle

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Authors and Affiliations

  1. Research Unit of Applied Thermodynamic, Engineering National School of Gabès, University of Gabès, Omar Ibn El Khattab St, 6029, Gabès, Tunisia

    Nihed Kilani, Tahar Khir & Ammar Ben Brahim

Authors
  1. Nihed Kilani
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  2. Tahar Khir
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  3. Ammar Ben Brahim
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Correspondence to Nihed Kilani.

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Kilani, N., Khir, T. & Ben Brahim, A. Energetic and Exergetic Optimization of a Combined Cycle Power Plant with Dual-Pressure HRSG, Compressed Air Cooling, Steam Injection and Vapor Extraction Systems. Iran J Sci Technol Trans Mech Eng 43 (Suppl 1), 527–536 (2019). https://doi.org/10.1007/s40997-018-0175-8

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  • DOI: https://doi.org/10.1007/s40997-018-0175-8

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