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Advanced Fossil Fuel Power Systems
Published in D. Yogi Goswami, Frank Kreith, Energy Conversion, 2017
Repowering projects have been dormant since the 1990s. Economic factors and the difficulties associated with brownfield construction have been the primary reasons for that. Nevertheless, there may be a revival in repowering projects due to much more stringent emissions control requirements enforced by government agencies that make the aging fossil-fuel–fired power plants impossible to keep running. The investment into new equipment to reduce harmful stack emissions and improve the efficiency is simply too high. The situation is made even worse by low natural gas prices, driven by increased production of shale gas using new technology such as fracking. Thus, natural gas–fired gas turbine technology with efficiencies pushing 60% becomes economically a much more attractive alternative.
Renewable Energy Markets
Published in Anco S. Blazev, Global Energy Market Trends, 2021
Repowering, i.e. replacing “old” wind turbines with more modern and productive equipment, is on the rise too. Repowering is shown to increase wind power while reducing its footprint. Today, a 2.0 MW wind turbine with a 260 feet diameter rotor generates 4–6 times more electricity than a 500 kW turbine with a 130 feet diameter rotor built in 1995.
A multi-attribute review toward effective planning of end-of-life strategies for offshore wind farms
Published in Energy Sources, Part B: Economics, Planning, and Policy, 2021
Ali Jadali, Anastasia Ioannou, Athanasios Kolios
Reusing an existing installation can be a valid strategy to reduce environmental pollution and delay high decommissioning expenses (Bull and Love 2019; Kaiser and Snyder 2010). To this end, alternative strategies that can proceed decommissioning can be repowering and service life extension. Service life extension is the process of evaluating the current integrity state of the asset, with a view to evaluating its residual service life and issuing a certificate of fitness-for-purpose for an extended period. Repowering is the process of substituting critical sub-systems/components of an asset, such as generator and blades, potentially with more technologically advanced components, which can harvest more of the energy potential, while maintaining subsystems designed for a longer nominal life such as the tower and electrical infrastructure (also known as the balance of plant, BOP). Both processes are influenced by the confidence in evaluating the integrity of the structure after 20–25 years of operation and, in the case of repowering, the capacity of the electrical infrastructure to handle the maximum load.
An exergetic investigation of hot windbox and feedwater heating systems as repowering options for thermal power plants
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
A. Alp Erdogan, M. Zeki Yilmazoglu
Considering the future of energy generation and climate change issues, the enhancements in energy efficiencies, greenhouse gas emissions control, and fuel consumption reduction for the existing thermal power plants (TPP) have gained importance in recent years. To satisfy the continuous energy demand, the installed capacity of the countries has an increasing trend. However, due to energy policy issues such as energy diversification (Akrofi 2020; Limi 2020), fuel mixing (cofiring) (Dharfizi, Ghani, and Islam 2020), or installation costs for a new power plant investment (Müller and Teixido 2021) and feedstock difficulties (Wander et al. 2020; Xu et al. 2020) force the governments or investors to search for alternatives that support the continuous operation. Therefore, many investors and managers prefer the alternatives of both increasing the overall efficiency and decreasing greenhouse gas emissions. From that aspect, the repowering options are the most practical and promising solutions for old or existing TPPs (Kabiri, Khoshgoftar Manesh, and Amidpour 2020; Samanta and Ghosh 2021). Besides, the enhancements for the coal-fired power plants should be executed to meet the needs for efficiency, capacity, and global warming issues, since these still have to offset the greatest portion of demands compared to other power plant options. Above all the other enhancement methods, repowering options seem to be the best solution to offset higher demands efficiently with decreased greenhouse gas emissions, mainly CO2 per kWh electricity generated.
4E analysis and evaluation of a steam power plant full repowering in various operations
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Saeed Kabiri, Mohammad Hasan Khoshgoftar Manesh, Majid Amidpour
One of the methods for repowering old steam power plants is the use of a gas turbine along with a steam cycle. In this way, the steam plant is converted into a combined cycle block, which will increase its efficiency by about 20%. In this study, a 300 MW steam power plant was explored for repowering by Fränkle, which increases significantly the thermal efficiency of power plants (Fränkle 2006). Bianchi et al. focused on the repowering of steam plants in Europe. One of the ways to repower is to recover and make optimal use of waste energy. This technique, known as Waste to Energy or WTE, focuses on retrieving available energy. It has been attempted to increase the thermal efficiency of steam power plants using the gas turbine and heat recovery reactor boiler or HRSG. In this case, the efficiency of the first law of the thermodynamic increases up to 36% (Bianchi et al. 2015). The advantage of using an HRSG is that important parameters, such as the pressure of the steam generator, can be changed during the design phase to reach the proper working pressure level for the steam cycle. However, Akbari et al. considered three different levels of pressure for the HRSG and, with a multi-purpose analysis system, tried to study power plant repowering and choose the best pressure level for more efficiency; they reported an increased generated net energy of about 50% (Akbari, Marzban, and Ahmadi 2017).