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New Innovation and Idea | Power Engineering | India | Volume 13 Issue 6, June 2024 | Popularity: 6.9 / 10

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Novel Solution to Mitigate Thermal Plant Flexibilization Issues along with Meeting Peak Demand by Integrating Thermal Energy Storage System with Thermal Power Plant: A Comprehensive Review and Analysis

Pankaj Kumar Gupta, Dipankar Halder, Sankardas K

Abstract: The rapid increase in renewable energy penetration forces thermal plants to operate in a more flexible mode, with thermal power plants assuming a pivotal role in meeting peak demand and supplementing periods of low RE generation. In flexible operation, thermal power plants will face more load variation from high load to load far below design limit and faster ramping rates. This flexible operation, particularly low load operation of thermal power plants, have severe detrimental effects in boilers. This aggressive operation result in heightened thermal and mechanical stresses in the boiler and its downstream equipment, potentially leading to irreversible damage and reduced life span. Indian boilers, inherently larger due to lower Gross Calorific Value (GCV) and higher ash content of indigenous coal, face added complexity at lower load operation of boiler such as flame instability leading to forced outage, reduced efficiency, increased auxiliary power consumption, heightened slugging and fouling in addition to most detrimental effect of reduction of equipment life. Innovative solution of Thermal Energy Storage system integrated with thermal power plant can help in avoiding both low load and severe cyclic operation of steam generator, thereby addressing the challenges associated with flexible plant operation. This solution can also be used to supply additional power to balance demand supply gap during the peak hours using existing thermal plant infrastructure without additional thermal power capacity addition. In this paper, a detailed study on Thermal Energy storage integration with thermal power unit along with case studies for an Indian 500MW unit is presented. This paper analyses various options of charging & discharging strategies. Further, details with respect to design factors to determine TESS Integration Strategies & Role of Charging Steam, Selection of Compatible and Efficient Charging Options and TESS Discharging Options for different use cases is also deliberated. This paper describes distinctive Advantages of TESS which make it well - suited for Integration with TPP.

Keywords: Thermal Energy Storage System, Renewable Energy Integration, Thermal Power Plant, Flexibilization, Peak Demand

Edition: Volume 13 Issue 6, June 2024

Pages: 962 - 968

DOI: https://www.doi.org/10.21275/SR24612093926

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