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Analyse the Effect of Enthalpy/Temperature Drops in Pipelines on the Performance of Coal-Fired Thermal Power Plant

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Abstract

In this research work, the effects of enthalpy/temperature drops in various pipelines on the performance of coal-fired thermal power plant have been analysed. Power outputs, heat rates, entropy generation rates, entropy generation numbers, exergy destruction rates, effectiveness, entransy dissipation rates, entransy dissipation-based thermal resistances and entransy dissipation numbers have been analysed for various components of the power plant at different enthalpy/temperature drops. Percentage changes (i.e. increments/decrements) in different parameters have also been calculated for a finite range of thermodynamic property drops. This analytical work can be concluded as: Maximum exergy destruction and entropy generation rates have been found for the boiler as 221,051.3 kW and 729.54 kW/K, respectively, at 100% load. The maximum energy rate has been converted in the intermediate-pressure steam turbine as 57,956.21 kW at 100%. Minimum exergy destruction and entropy generation rates have been obtained for low-pressure turbine as 5059.25 kW and 16.69 kW/K, respectively. It has also been found exergy destruction and entropy generation rates increase with enthalpy drop. Percentage increments in the exergy destruction and entropy generation rates also increase with enthalpy drop. Several recommendations have been given to the improvement of the plant outputs; maximum energy is converted in intermediate-pressure turbine so number of stages should be increased as compared to other steam turbines. Power plant should be operated on full load condition. Extraction pipelines should be properly insulated and better insulated pipe material should be used for the pipelines. Performance of feed water heaters can also be increased by preheating arrangement, i.e. solar water heaters.

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Abbreviations

CFPP:

Coal-fired thermal power plant

C p :

Specific heat of flowing fluids (kJ/kg K)

EDR:

Entransy dissipation rates (kW K)

EQi :

Extraction quantities from different stages of HP, IP and LP turbines (kg/s)

ExDR:

Exergy destruction rate (kW)

G :

Entransy (kW K)

h i :

Enthalpies at different stages of HP, IP and LP turbines (kJ/kg)

LKi :

Leakages from different stages of HP, IP and LP turbines (kg/s)

P :

Pressure of steam for CFPP (bar)

Q :

Heat addition in boiler/superheater (kW)

T :

Temperature (K)

V :

Specific volume of steam for CFPP (m3/kg)

m :

Mass flow rate of steam for CFPP (kg/s)

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Acknowledgements

This work was done at Sushila Devi Bansal College of Technology, Indore, India. There is no conflict of interest. Author is very thankful to BHEL Bhopal for providing useful information/data which are used in this case study. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit stores.

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  1. Mechanical Engineering Department, Sushila Devi Bansal College of Technology, Indore, Madhya Pradesh, 453331, India

    Ankur Geete

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Geete, A. Analyse the Effect of Enthalpy/Temperature Drops in Pipelines on the Performance of Coal-Fired Thermal Power Plant. J. Inst. Eng. India Ser. C 102, 603–628 (2021). https://doi.org/10.1007/s40032-021-00671-1

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