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Optimization and advance thermodynamic analysis of dual stage Co2 power cycle combined to gas turbine

  • Hosaien Khosravi
  • Gholamreza SalehiEmail author
  • Masoud Torabi Azad
Original Article
  • 22 Downloads

Abstract

This paper presents a thermodynamic and economic modeling of Rankine cycles (RCs) that use waste exhaust energy of a gas turbine in the power plant of Sirri Island in Iran based on energy, exergy and economic concepts. In addition, the exergoeconomic and advanced exergy analyses were performed. This cycle is composed of a supercritical CO2 Rankine and a transcritical CO2 cycle. Two objective functions, including the most rate of net power generation of the Rankine cycle (as a thermodynamic criterion) and the lowest total purchased equipment cost (as an economic criterion), are considered simultaneously. This model is constructed on the basis of the energy, exergy and economic analysis according to the Total Revenue Requirement (TRR) method. After validating the model, the advanced exergy analysis is performed to split exergy destruction rate into endogenous, exogenous, avoidable and unavoidable parts in order to provide detailed information about the potential improvement of the system components. The final results indicate that the net electric power output of the Rankine cycle and the total purchased equipment cost become 2.31 (MW) and 301473 (US$), respectively. Also, the exergy efficiency and the total exergy destruction of the cycle reach 48.4% and 8757.4 (KW), respectively.

Nomenclature

A

Area, m2

\( \dot{C} \)

Cost Rate, $/h

DCC

Direct cost, $

\( {\dot{EX}}_D \)

Exergy destruction, kw

\( {\dot{EX}}^Q \)

Exergy of heat stream, kw

\( {\dot{EX}}^w \)

Exergy of work stream, kw

ex

Specific exergy, kw/kg

h

Specific Enthalpy, kj/kg

ICC

In-Direct cost, $

\( \dot{m} \)

Mass flow rate, kg/s

PEC

Purchased equipment cost, $

\( \dot{Q} \)

Heat rate, kw

S-

Supercritical

T-

Transcritical

TCI

Total capital investment, $

\( \dot{W} \)

Work, kw

\( \dot{Z} \)

Annual investment cost rate, $/h

Subscript

o

Out

i

In

src

Source

0

Dead State

sc

SuperCritical

tc

TransCritical

T

Turbine

g

Generator

ex

Exergy

prh

Preheater

Q

Heat transfer

F

Fuel

Superscript

K

Kinetic

P

Potential

Abbreviations

DCC

Direct Capital Cost

ICC

In-Direct Capital Cost

PEC

Purchased equipment cost

TCI

Total Capital Investment

SRC

Source

EX

Exogenous

EN

Endogenous

AV

Available

UN

Un-available

TC

TransCritical

SC

SuperCritical

ph

Physical

ch

Chemical

Prh

Preheater

Notes

Acknowledgements

The authors gratefully acknowledge the data collection support by the Sirri Island supervisors.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Energy System Engineering, North Tehran BranchIslamic Azad UniversityTehranIran
  2. 2.Department of Mechanical Engineering, Central Tehran BranchIslamic Azad UniversityTehranIran

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