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Thermo-economic assessment of biomass gasification-based power generation system consists of solid oxide fuel cell, supercritical carbon dioxide cycle and indirectly heated air turbine

  • Dibyendu Roy
  • Samiran SamantaEmail author
  • Sudip Ghosh
Original Paper
  • 30 Downloads

Abstract

This study energetically, exergetically and economically analyses a hybrid electricity generation system. The proposed system is a combination of a biomass gasifier, a solid oxide fuel cell module, an indirectly heated air turbine and a supercritical carbon dioxide power cycle. Influences of major designing and operating plant parameters, viz. current density of the solid oxide fuel cell, pressure ratio of the air compressor, turbine inlet temperature of the CO2 gas turbine, on the performance of the proposed system have been examined. The proposed system exhibits the highest first law efficiency of 51% at the current density of 2000 A/m2 and cell temperature of 1123 K, air compressor pressure ratio of 4.4, CO2 gas turbine inlet pressure and temperature of 10.14 MPa and 423 K. At this aforesaid condition, the proposed system exhibits a second law efficiency of 45%. It is found that the highest amount (40.70%) of exergy destruction takes place at the biomass gasifier, followed by the solid oxide fuel cell (20.05%). The economic analysis predicts that the minimum achievable levelized unit cost of electricity is 0.095 $/kWh.

Graphical abstract

Keywords

Solid oxide fuel cell Supercritical CO2 cycle Indirectly heated air turbine Biomass gasification Exergy Economy 

List of symbols

A

Area (m2)

a

Transmission loss

AB

After burner

AC

Air compressor

AT

Air turbine

BA

Air blower

C

Capital cost

CEPCC

Engineering, procurement and construction cost

CRF

Capital recovery factor

CTEC

Total equipment cost

CTOC

Total overnight cost

CTPC

Total plant cost

CUF

Capacity utilization factor

CGT

CO2 gas turbine

EES

Engineering equation solver

ESBC

Electric specific biomass consumption

Ex

Exergy (kW)

F

Faraday constant (C/kmol)

f

Annual inflation rate (%)

GCU

Gas cleaning unit

h

Specific enthalpy (kJ/kmol)

HEX

Heat exchanger

HHV

Higher heating value (kJ/kg)

HPC

High-pressure compressor

HRGH

Heat recovery gas heater

i

Current (A)

j

Current density (A/m2)

K

Equilibrium constant

LHV

Lower heating value (kJ/kg)

LMTD

Log mean temperature difference

LPC

Low-pressure compressor

LUCE

Levelized unit cost of electricity

m

Mass flow rate (kg/s)

N

Molar flow rate (kmol/s)

Ncell

Number of cell in a stack

No

Nominal interest rate

NSOFC

Number of SOFC stack

p

Pressure (MPa)

Δg°

Change in Gibbs function (kJ/kmol)

R

Universal gas constant (kJ/kmol-K)

RH

Reheater

s

Specific entropy (kJ/kmol-K)

SOFC

Solid oxide fuel cell

T

Temperature (K)

TIT

Turbine inlet temperature (K)

V

Voltage (V)

Vc

Cell voltage (V)

W

Power (kW)

Subscripts

o, ref

Reference state

sys

System

D

Destruction

biom

Biomass

phy

Physical

che

Chemical

in

Inlet

ex

Exit

Greek letters

η

Efficiency

\(\xi\)

Effectiveness

\(\varphi\)

Exergy efficiency

\(\varsigma_{\text{AB}}\)

Combustion effectiveness

Notes

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Copyright information

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

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIndian Institute of Engineering Science and TechnologyShibpur, HowrahIndia
  2. 2.School of Mechanical EngineeringKalinga Institute of Industrial Technology, Deemed to be UniversityBhubaneswarIndia

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