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Exergetic analysis and evaluation of coal-fired supercritical thermal power plant and natural gas-fired combined cycle power plant

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Abstract

The present work has been undertaken for energetic and exergetic analysis of coal-fired supercritical thermal power plant and natural gas-fired combined cycle power plant. Comparative analysis has been conducted for the two contestant technologies. The key drivers of energetic and exergetic efficiencies have been studied for each of the major sub-system of two contestant technologies. Overall energetic and exergetic efficiency of coal-fired supercritical thermal power plant are found to be 43.48 and 42.89 %, respectively. Overall energetic and exergetic efficiency of natural gas-fired combined cycle power plant are 54.47 and 53.93 %, respectively. The major energetic power loss has been found in the condenser for coal-fired supercritical thermal power plant. On the other hand, the major energetic power loss has been found in both the condenser and heat recovery steam generator for gas-fired combined cycle thermal power plant. The exergetic analysis shows that boiler field is the main source of exergetic power loss in coal-fired supercritical thermal power plant and combustion chamber in the gas-fired combined cycle thermal power plant. It is concluded that natural gas-fired combined cycle power plant is better from energetic and exergetic efficiency point of view. These results will be useful to all involved in the improvement of the design of the existing and future power plants.

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Abbreviations

B:

Boiler

BFP:

Boiler feed water pump

C:

Air compressor

Con:

Condenser

Com:

Combustion

CC:

Combustion chamber

CEP:

Condensate extract pump

D:

Deaerator

EXP:

Expansion valve

f:

Fuel

FWH:

Feed water heater

GT:

Gas turbine

gen:

Generation

heat:

High temperature heat exchanger

HPH:

High pressure feed water heater

HPT:

High pressure turbine

HFP:

High pressure feed water pump

HRSG:

Heat recovery steam generator

IPT:

Intermediate pressure turbine

LPT:

Low pressure turbine

LPH:

Low pressure feed water heater

LFP:

Low pressure feed water pump

p:

Combustion products

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Authors and Affiliations

  1. Sardar Patel Renewable Energy Research Institute, Vallabh Vidhyanagar, 388 120, Gujarat, India

    V. Siva Reddy

  2. Centre for Energy Studies, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    S. C. Kaushik

  3. Sardar Swaran Singh National Institute of Renewable Energy, Jalandhar-Kapurthala Road, Wadala Kalan, Kapurthala, 144601, Punjab, India

    S. K. Tyagi

Authors
  1. V. Siva Reddy
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  2. S. C. Kaushik
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  3. S. K. Tyagi
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Correspondence to V. Siva Reddy.

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Siva Reddy, V., Kaushik, S.C. & Tyagi, S.K. Exergetic analysis and evaluation of coal-fired supercritical thermal power plant and natural gas-fired combined cycle power plant . Clean Techn Environ Policy 16, 489–499 (2014). https://doi.org/10.1007/s10098-013-0647-x

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