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Arabian Journal for Science and Engineering

, Volume 44, Issue 2, pp 1657–1669 | Cite as

Aligning Combined Cycle Power Plant Performance with Field Measurements

  • Yousef S. H. Najjar
  • Yaman Mohammad Ali Manaserh
Research Article - Mechanical Engineering
  • 3 Downloads

Abstract

This paper studied a system of two gas turbine engines with inlet guide vanes followed by a steam turbine. The steam turbine recovers energy from the exhaust gas of the gas turbine engines through heat recovery steam generators. An actual combined cycle is modeled; this system model takes into consideration the variation of specific heats of air and combustion gases, the polytropic efficiencies of gas turbines and compressors, and the isentropic efficiencies of the steam turbine and pumps. Moreover, pressure drops were taken into consideration for all different heat exchangers. Model performance predictions were then aligned with the field measurements of a Jordanian combined cycle power plant. This paper presents the comparison between the model predictions and actual performance, specifically for power output and fuel consumption. The relative error between the theoretical and actual output power from the plant is approximately 8%. Ambient air temperature has a major effect on the plant-produced power and fuel consumption. Under desert conditions between summer and winter, when the ambient temperature drops from 46 to 1 \(^\circ \)C, an extra 47.2 MW could be generated, with the corresponding increase in efficiency of approximately 6.5%, while SFC decreases by 1.1%.

Keywords

Sustainable energy Gas turbine engine Steam turbine Combined cycle Modeling Validation study 

List of symbols

CCPP

Combined cycle power plant

\(C_p\)

Specific heat at constant pressure

DP

Design point

E

Error

EA

Excessive air

EGT

Exhaust gas temperature

EL

Energy lost

f

Fuel air ratio

GT

Gas turbine

h

Specific enthalpy (kJ/kg)

HP

High pressure

HPEC

High-pressure economizer

HPEV

High-pressure evaporator

HPP

High-pressure pump

HPSH

High-pressure superheater

HPST

High-pressure steam turbine

HRSG

Heat recovery steam generator

IGV

Inlet guide vanes

ISCC

Integrated solar combined cycle

LHV

Lower heating value (MJ/kg)

LP

Low pressure

LPEV

Low-pressure evaporator

LPP

Low-pressure pump

LPST

Low-pressure steam turbine

\(\dot{m}\)

Mass flow rate (kg/s)

n

Polytrophic exponent

P

Pressure (kPa)

\(\dot{Q}\)

Heat transfer rate

\(\dot{Q}_{\mathrm{gain}}\)

Rate of heat gained by water in HRSG

\(\dot{Q}_{\mathrm{out}}\)

Rate of heat leaving condenser

r

Compression ratio

ST

Steam turbine

SFC

Specific fuel consumption

T

Temperature (\(^\circ \)C)

TRIT

Turbine rotor inlet temperature

\(\dot{W}\)

Work consumed or produced

Greek letters

\(\gamma \)

Specific heat ratio

\(\varepsilon \)

Effectiveness

\(\eta \)

Efficiency

\(\phi \)

Equivalence ratio

\(\infty \)

Polytropic

Subscripts

a

Air

ac

Actual

c

Compressor

CG

Combustion gases

g

Gas

s

Isentropic

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Yousef S. H. Najjar
    • 1
  • Yaman Mohammad Ali Manaserh
    • 1
  1. 1.Mechanical Engineering DepartmentJordan University of Science and TechnologyIrbidJordan

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