Investigating the effect of high pressure heater elimination on power generation of Shazand power plant

Abstract

Due to some problem in high pressure (HP) heaters in Shazand steam cycle power plant, sometimes these heaters should be eliminated from the cycle. At his condition, the main concern is keeping the constant value of power generation. The elimination of each heater changes the thermodynamic states in the numerous points of the cycle especially boiler and may put it in a destructive condition. The main goal of this paper is to find the maximum net power in elimination of HP heaters. For this purpose, total cycle is modeled and verified by the experimental data in which a lot of trial and error process has been done for each modeling of the whole cycle and the boiler outlets are required for many times in each cycle simulation. Then, ANN is used as an alternative and fast method for simulation of boiler and consequently the whole cycle. Different set of HP heaters have been eliminated from the cycle and new cycle condition is obtained. Afterwards, two boiler important parameters including metal and furnace exit gas temperatures have been checked at these new conditions. Finally, the cycle could provide 300 MW net power in elimination of HP heaters in each unit.

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Abbreviations

h :

Enthalpy (kJ/kg.K)

C fuel :

Price of fuel ($/kg)

\({\dot{m}}\) :

Mass flow rate (kg/s)

\({\dot{Q}}\) :

Rate of heat transfer (kW)

\({\dot{W}}\) :

Power (kW)

LHV :

Fuel lower heating value (kJ/kg)

P :

Pressure (kPa)

rp :

Turbine pressure ratio (−)

TTD :

Terminal Temperature Difference (°C)

\(\varepsilon\) :

Total cycle thermal efficiency (–)

\(\tau\) :

Hours of operation per year

\(\eta\) :

Efficiency (–)

i :

Inlet

o :

Outlet

b :

Boiler

s :

Isentropic

a :

Actual

cond :

Condenser

p :

Pump

T :

Turbine

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Acknowledgements

This research was supported by Shazand power plant in Iran. The authors would like to express very great appreciation to Shazand power plant for their assistance in collection of data and any support in this research.

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Correspondence to S. A. Mostafavi.

Appendices

Appendix A

See Table

Table 6 Boiler inlet parameters used as artificial neural network input

6.

Appendix B

See Table

Table 7 Boiler output parameters calculated by boiler software used as artificial neural network outputs

7.

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Mostafavi, S.A., Hajabdollahi, H. Investigating the effect of high pressure heater elimination on power generation of Shazand power plant. Int J Energ Water Res (2020). https://doi.org/10.1007/s42108-020-00081-6

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Keyword

  • Steam cycle power plant
  • High pressure heater
  • Thermal modelling
  • Boiler modelling
  • Artificial neural network