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Thermo-environmental Analysis of Recuperated Gas Turbine-Based Cogeneration Power Plant Cycle

Arabian Journal for Science and Engineering volume 41, pages 691–709 (2016)Cite this article

Abstract

Two of the most prominent techniques to improve energy conversion efficiency of a gas turbine-based combined heat and power plant are the use of “recuperation” and “cogeneration”. Thermodynamic and environmental analysis of this type of cycle has been reported in the article. Exergy analysis of the proposed recuperated gas turbine–triple pressure Rankine combined cycle has been presented in comparison with traditional basic gas turbine-based combined cycle. Analysis of emission of oxides of nitrogen from power plant based on the proposed cycle has been carried out to estimate its environmental impact. The results of exergy analysis show a higher gas turbine rational efficiency = 37.32% in case of recuperated gas turbine-combined cycle as compared to 34.41% for basic gas turbine-combined cycle configuration due to a relative decrease in fuel requirement. Results also show that power-to-heat ratio and cogeneration energy efficiency of recuperated gas turbine cogeneration configuration is 0.8246 and 56.28% respectively, while cogeneration exergy efficiency for basic gas turbine-based cycle has been found to be 47.67% and power-to-heat ratio is 0.6749. Emission of oxides of nitrogen from the proposed cycle has been observed to increase with increase in compression pressure ratio and has been found to be around 5.30 g/kg of fuel at compressor pressure ratio of 23.

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Abbreviations

B :

Exergy (kJ/kg)

c p :

Specific heat at constant pressure (kJ/kgK)

F sa :

Correction factor to account actual blade surface

ΔGr:

Gibbs free energy function (43,890 kJ/kg)

h :

Specific enthalpy (kJ/kg)

\({\triangle{H}_{\rm r}}\) :

Lower heating value (kJ/kg)

m :

Mass flow rate (kg/s)

p :

Pressure (bar)

Q :

Heat input (kJ/kg)

R :

Gas constant (kJ/kgK)

R PH :

Power-to-heat ratio

RIT:

Rotor inlet temperature (K)

s :

Entropy (kJ/kg/K)

S :

Blade perimeter (m)

St:

Average Stanton number

t :

Pitch of blade (m)

T :

Temperature (K)

T PZ :

Primary zone temperature (K)

W :

Specific work (kJ/kg)

a:

Air

alt:

Alternator

b:

Blade

c:

Compressor

cc:

Combined cycle

cogen:

Cogeneration

comb:

Combustor

cond:

Condenser

cool:

Coolant

d:

Destruction

d/a:

Deaerator

e:

Exit

eff:

Efficiency

en:

Energy

f:

Fuel

fp:

Feed pump

g:

Gas

gt:

Gas turbine

hp:

High pressure

hpd:

High-pressure drum

hpst:

High-pressure steam turbine

in:

Inlet

ip:

Intermediate pressure

ipd:

Intermediate-pressure drum

ipst:

Intermediate-pressure steam turbine

iso:

Isothermal

j:

Bleed points of compressor

lp:

Low pressure

lpd:

Low-pressure drum

lpst:

Low-pressure steam turbine

net:

Net

p:

Pump

pl:

Plant

pr:

Process

rat:

Rational

rc:

Recuperator

s:

Steam

st:

Steam turbine

w:

Water

ν :

Specific volume (m3/kg)

Πp,c :

Compressor pressure ratio

Ψ:

Effectiveness of recuperator

η :

Efficiency (%)

η pc :

Polytropic efficiency of compressor (%)

η pt :

Polytropic efficiency of turbine (%)

ϕ :

Ratio of mass of coolant to mass of gas flow (kg/kg of gas)

ɛ :

Availability per unit mass of gas (kJ/kg)

α :

Blade angle (m)

τ :

Residence time (ms)

AFC:

Air film cooling

BGT:

Basic gas turbine

B3PR:

Basic gas triple pressure reheat steam combined cycle layout

CHP:

Combined heat and power

GT:

Gas turbine

HRSG:

Heat recovery steam generator

RcGT:

Recuperated gas turbine

ST:

Steam turbine

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Jamshedpur, Jamshedpur, 831014, India

    Anupam Kumari &  Sanjay

Authors
  1. Anupam Kumari
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  2. Sanjay
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Correspondence to Sanjay.

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Kumari, A., Sanjay Thermo-environmental Analysis of Recuperated Gas Turbine-Based Cogeneration Power Plant Cycle. Arab J Sci Eng 41, 691–709 (2016). https://doi.org/10.1007/s13369-015-1835-2

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Keywords

  • Cogeneration
  • Recuperation
  • Power-to-heat ratio
  • Cogeneration energy efficiency
  • Cogeneration exergy efficiency
  • NO x