首页|Enhancing conventional steam power plant performance through feed water heating repowering

Enhancing conventional steam power plant performance through feed water heating repowering

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Repowering of old steam power plants is a viable solution to increase powerand improve efficiency. This study investigates the feasibility of feed waterheating repowering for the Neka steam power plant by considering theinfluences of steam mass flow rate on the condenser performance and theheat rate of the new cycle. Energy and exergy analyses were conducted usingthe first and second laws of thermodynamics and heat transfer relations ineach scheme. The effect of increasing the steam mass flow rate on theperformance of the condenser and the cycle was also investigated. Therepowered cycle was simulated using Thermoflow software, and the resultswere validated with small errors. The results showed that replacing low andhigh-pressure heaters with new heat exchangers increased the power of thesteam unit and the repowered cycle, energy, and exergy efficiencies by15.7%, 49.3%, 5.93%, and 2.17%, respectively. Although the condenser pressureincreased by 19 millibars, leading to a 0.63% increase in the heat rate,the total heat rate of the repowered cycle improved by 4.62%. Overall, thefindings demonstrate that feed water heating repowering can be an effectivestrategy to increase the efficiency and power of conventional steam powerplants.

Repoweringthermodynamic analysisheat ratecondenser performancesteam power plant

Jamshid Naeimi、Mojtaba Biglari、Saadat Zirak、Iraj Jafari Gavzan

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Faculty of Mechanical Engineering, Semnan University, Semnan, Iran

2024

Energy sources, Part A. Recovery, utilization, and environmental effects
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