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Exergoeconomic and exergoenvironmental analysis of a coal-fired thermal power plant

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Abstract

When evaluating a thermal system, exergy analysis is performed in addition to energy analysis to determine the location and quantity of losses in the system. In this study, energy, exergy, exergoeconomic and exergoenvironmental analyses of Orhaneli thermal power plant located in Bursa are carried out. In exergy analysis, physical and chemical exergies are taken into consideration and potential and kinetic exergies are neglected. Exergoeconomic analysis is conducted by using specific exergy costing (SPECO) method and cost values corresponding to each exergy flows are calculated. According to exergoeconomic analysis, unit exergy cost and exergy cost of steam sent to high-pressure turbine are calculated as 17.94 $/GJ and 22,854 $/h, respectively. The highest exergoeconomic factor is measured in pump (P2) and followed by P3. For the life cycle assessment (LCA) analysis, eco-indicator 99 impact assessment method is selected. LCA results are transferred to exergy flows and then exergoenvironmental analysis is performed. Environmental impact per exergy unit and exergetic environmental impact rate of the steam sent to high-pressure turbine are calculated as 14,680 mPts/GJ and 18,700 Pts/h, respectively. The highest exergoenvironmental factor is measured in pump (P2) and followed by P3.

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Abbreviations

AC:

Annual investment cost

B:

Boiler

C:

Condenser, carbon

CBRT:

Central bank of republic of Turkey

CRF:

Capital recovery factor

D:

Deaerator

DI:

Disposal

EES:

Engineering equation solver

ER:

Exchange rate

F:

Fuel

FBCC:

Fluidized bed coal combustor

H:

Hydrogen

HPH:

High-pressure heater

HPT:

High-pressure turbine

IPT:

Intermediate-pressure turbine

LCA:

Life cycle assessment

LHV:

Lower heating value

LPH:

Low-pressure heater

LPT:

Low-pressure turbine

MOPSA:

Modified productive structure analysis

N:

Nitrogen

O:

Oxygen

OM:

Operation and maintenance

P:

Pressure, pump, product

PW:

Present value

PWF:

Present value factor

PEC:

Purchase equipment cost

S:

Sulfur

SPECO:

Specific exergy costing

SV:

Salvage value

TCI:

Total capital investment

\(b\) :

Environmental impact per exergy unit (mPts/GJ)

\(\dot{B}\) :

Exergetic environmental impact rate (mPts/h)

\(c\) :

Unit exergy cost ($/GJ)

\(\dot{C}\) :

Exergy cost ($/h)

\(\dot{E}\) :

Energy (kW)

\(\dot{Ex}\) :

Exergy (kW)

\(f\) :

Exergoeconomic and exergoenvironmental factor

\(h\) :

Enthalpy (kJ/kg)

\(i\) :

Interest rate

\(m\) :

Mass (kg)

\(\dot{m}\) :

Mass flow rate (kg/s)

\(M\) :

Molecular weight

\(n\) :

Mole, system life in years

\(Pr\) :

Price

\(\dot{Q}\) :

Heat (kW)

\(R\) :

Universal gas constant (kJ/kmol.K)

\(r\) :

Relative economic and environmental difference (%)

\(s\) :

Entropy (kJ/kg.K)

\(T\) :

Temperature (°C)

\(t\) :

Annual hours (h/y)

\(w\) :

Mass faction of moisture in coal, weight

\(\dot{W}\) :

Work (kW)

\(\dot{Y}\) :

Component-related environmental impact rate (mPts/h)

\(\dot{Z}\) :

Investment cost of components ($/h

ƞ :

Efficiency

μ :

Coefficient of salvage value

\({\varepsilon }^{o}\) :

Chemical exergy of solid fuel

i:

Inlet

o:

Outlet

k:

Kth component

T:

Turbine

TTD:

Terminal Temperature Difference

e:

Economic

b:

Environmental

D:

Destruction

ph:

Physical

ch:

Chemical

w :

Electricity

CO:

Construction

DI:

Disposal

OM:

Operation and maintenance

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Acknowledgements

The authors thank the support given by the Orhaneli Thermal Power Plant managers.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Bursa Technical University, 16330, Bursa, Turkey

    Abdullah Duzcan & Yusuf Ali Kara

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  1. Abdullah Duzcan
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Correspondence to Abdullah Duzcan.

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Duzcan, A., Kara, Y.A. Exergoeconomic and exergoenvironmental analysis of a coal-fired thermal power plant. J Braz. Soc. Mech. Sci. Eng. 43, 542 (2021). https://doi.org/10.1007/s40430-021-03254-4

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