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Exergic Analysis of an ISCC System for Power Generation and Refrigeration

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Abstract

Exergic analysis has become an effective method of thermodynamic behavior evaluation for power systems. The current study focuses on an integrated solar–gas combined cycle (ISCC) system for electric power generation and refrigeration. Exergic analysis of the ISCC system is conducted by using the gray-box model as well as the Ebsilon software. The results show that under the rated working condition, the total exergy loss and overall exergy efficiency of the ISCC system are 119.078 MW and 44.63  %. The two largest exergy losses exist in the combustion chamber and solar DSG system, which are 56.45 MW and 28.52 MW, respectively. The LiBr–H2O absorption chiller system, HRSG, steam turbine and condenser have the same grade exergy losses. When the solar intensity augments, though the solar DSG system has an increase in the exergy efficiency, its exergy loss also increases, leading to the increase in the total exergy loss as well as the decrease in the overall exergy efficiency of the ISCC system. Therefore, further optimizations of the ISCC system should focus on the improvements of the solar DSG system and combustion chamber. The economic and ecological evaluations demonstrate that the ISCC system is economically feasible and ecologically friendly.

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Abbreviations

AC:

Absorption chiller

CFP:

Coal-fired power

DNI:

Direct normal irradiance

DSG:

Direct steam generator

GT:

Gas turbine

HPC:

High-pressure cylinder

HRSG:

Heat recovery steam generator

HWH:

Hot water heater

ISCC:

Integrated solar combined cycle

LPC:

Low-pressure cylinder

ST:

Steam turbine

GTCC:

Gas–steam turbine combined cycle

A an :

Conversion value of annual project investment cost (yuan)

C an :

Annual operating costs (yuan)

CF x :

Pollutant emission factor of standard coal (t·tce−1)

C o-m :

Annual operation and maintenance costs (yuan)

C npv :

Net present value (yuan)

E cfp :

Standard coal consumption of the CFP system (g·kWh−1)

ELC rate :

Electricity price (yuan·kWh−1)

E r :

Relative error (−)

E x + :

Exergy supply (MW)

E x- :

Effective exergy (MW)

E x,loss :

Exergy loss (MW)

E x,l :

Exergy loss (MW)

F an :

Annual fuel costs of the ISCC plant (yuan)

F x :

Annual pollutant emission reduction of the ISCC system (t)

G in :

Total project investment cost (yuan)

G iscc-x :

Pollutant emission quantity of the ISCC system (t)

G cfp-x :

Pollutant emission quantity of the CFP system (t)

h :

Specific enthalpy (kJ·kg−1)

h 0 :

Specific enthalpy of water in reference environmental state (kJ·kg−1)

IF x :

Pollutant emission factor of the ISCC system (mg·m−3)

IN an :

Annual income (yuan)

LHV :

Lower heat value (kJ·kg−1)

P back :

Dynamic investment payback period (year)

P gt :

Electric power generated by the gas turbine (MW)

P iscc :

Output electric power of the ISCC system (MW)

P s :

Electric power contributed by the solar DSG (MW)

P st :

Electric power generated by the steam turbine (MW)

Q solar :

Thermal power contributed by solar energy (MW)

Q fuel :

Thermal power contributed by natural gas (MW)

S :

Specific entropy (kJ·(kg·°C)−1)

S 0 :

Specific entropy of water in the reference environmental state (kJ·(kg·°C)−1)

T 0 :

Reference environmental temperature (K)

T s :

Solar surface temperature (K)

V gas :

Volumetric flow rate of gas of the ISCC system (m3·h−1)

W an :

Annual power generating capacity (kWh)

W c :

Energy consumption of the air compressor (MW)

W fp :

Energy consumption of the condensate pump (MW)

W lp :

Energy consumption of the feed water pump (MW)

W sh :

Output power of the gas turbine (MW)

η exe :

Exergy efficiency (−)

η exe -iscc :

Exergy efficiency of the ISCC system (−)

η overall :

Overall energy efficiency of the ISCC system (−)

ψ :

Solar energy grade (−)

an:

Annual

cfp:

Coal-fired power

exe:

Exergy

gt:

Gas turbine

iscc:

Integrated solar and gas combined cycle

s:

Solar

st:

Steam turbine

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Authors and Affiliations

  1. School of Energy and Power Engineering, Northeast Electric Power University, Jilin, 132012, China

    Gang Wang, Shukun Wang & Jianqing Lin

  2. School of Engineering Science, University of Science and Technology of China, Hefei, 230027, Anhui, China

    Zeshao Chen

Authors
  1. Gang Wang
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  2. Shukun Wang
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  3. Jianqing Lin
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  4. Zeshao Chen
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Correspondence to Gang Wang.

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Wang, G., Wang, S., Lin, J. et al. Exergic Analysis of an ISCC System for Power Generation and Refrigeration. Int J Thermophys 42, 101 (2021). https://doi.org/10.1007/s10765-021-02852-7

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  • DOI: https://doi.org/10.1007/s10765-021-02852-7

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