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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

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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.

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Abbreviations

A :

Area (m2)

a :

Transmission loss

AB:

After burner

AC:

Air compressor

AT:

Air turbine

BA:

Air blower

C :

Capital cost

C EPCC :

Engineering, procurement and construction cost

CRF:

Capital recovery factor

C TEC :

Total equipment cost

C TOC :

Total overnight cost

C TPC :

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)

N cell :

Number of cell in a stack

N o :

Nominal interest rate

N SOFC :

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)

V c :

Cell voltage (V)

W :

Power (kW)

o, ref:

Reference state

sys:

System

D:

Destruction

biom:

Biomass

phy:

Physical

che:

Chemical

in:

Inlet

ex:

Exit

η :

Efficiency

\(\xi\) :

Effectiveness

\(\varphi\) :

Exergy efficiency

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

Combustion effectiveness

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Correspondence to Samiran Samanta.

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Roy, D., Samanta, S. & Ghosh, S. 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. Clean Techn Environ Policy 21, 827–845 (2019). https://doi.org/10.1007/s10098-019-01671-7

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  • DOI: https://doi.org/10.1007/s10098-019-01671-7

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