Estimation of lifespan and economy parameters of steam-turbine power units in thermal power plants using varying regimes

Aminov, R. Z.; Shkret, A. F.; Garievskii, M. V.

doi:10.1134/s0040601516080012

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…Based on global experience, it can be assumed that the expected lifetime of supercritical coal-fired units may be from 35 to over 50 years [6][7][8][9]. This means that the decommissioning of the newest coal-fired units in Poland could take place even after 2070, i.e., more than 20 years after the planned achievement of climate neutrality.…”

Section: Options For Decarbonizing Polish Supercritical Coal-fired Power Unitsmentioning

confidence: 99%

Techno-Economic Assessment of Coal-Fired Power Unit Decarbonization Retrofit with KP-FHR Small Modular Reactors

et al. 2021

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The near and mid-term future of the existing Polish coal-fired power fleet is uncertain. The longer-term operation of unabated coal power is incompatible with climate policy and is economically challenging because of the increasing price of CO2 emission allowances in the EU. The results of the techno-economic analysis presented in this paper indicate that the retrofit of existing coal-fired units, by means of replacing coal-fired boilers with small modular reactors, may be an interesting option for the Polish energy sector. It has been shown that the retrofit can reduce the costs in relation to greenfield investments by as much as 35%. This analysis focuses on the repowering of a 460 MW supercritical coal-fired unit based on the Łagisza power plant design with high temperature small modular nuclear reactors based on the 320 MWth unit design by Kairos Power. The technical analyses did not show any major difficulties in integrating. The economic analyses show that the proposed retrofits can be economically justified, and, in this respect, they are more advantageous than greenfield investments. For the base economic scenario, the difference in NPV (Net Present Value) is more favorable for the retrofit by 556.9 M€ and the discounted payback period for this pathway is 10 years.

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Section: Options For Decarbonizing Polish Supercritical Coal-fired Power Unitsmentioning

confidence: 99%

Techno-Economic Assessment of Coal-Fired Power Unit Decarbonization Retrofit with KP-FHR Small Modular Reactors

et al. 2021

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“…According to ref. [37], the expected lifespan of steam turbines and associated heat exchangers with a capacity of 50-300 MW and steam parameters of 13-24 MPa is 220,000 h, which with a typical coal power plant capacity factor means roughly 40-45 calendar years, but this value changes with different operational characteristics [38]. Gas-insulated switchgear equipment is expected to last "at least 40 years", and according to ref.…”

Section: The Lifespan and Value Of Coal Power Plant Equipmentmentioning

confidence: 99%

Retrofit Decarbonization of Coal Power Plants—A Case Study for Poland

Qvist¹,

Gładysz

Bartela

et al. 2020

Energies

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Out of 2 TWe of coal power plant capacity in operation globally today, more than half is less than 14 years old. Climate policy related to limiting CO2-emissions makes the longer-term operation of these plants untenable. In this study, we assess the spectrum of available options for the future of both equipment and jobs in the coal power sector by assessing the full scope of “retrofit decarbonization” options. Retrofit decarbonization is an umbrella term that includes adding carbon capture, fuel conversion, and the replacement of coal boilers with new low-carbon energy sources, in each case re-using as much of the existing equipment as economically practicable while reducing or eliminating emissions. This article explores this idea using the Polish coal power fleet as a case study. Retrofit decarbonization in Poland was shown to be most attractive using high-temperature small modular nuclear reactors (SMRs) to replace coal boilers, which can lower upfront capital costs by ~28–35% and levelized cost of electricity by 9–28% compared to a greenfield installation. If retrofit decarbonization is implemented globally by the late 2020s, up to 200 billion tons of otherwise-committed CO2-emissions could be avoided.

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“…The combination of HPE with RES is necessary to smooth peak loads in the power system and ensure its stable operation during the day. At the same time, solar insolation is often used as a base load due to its wide availability [11,12]. The direct use of RES in the power system is difficult due to the discrepancy between energy consumption and its production [13,14].…”

mentioning

confidence: 99%

Improvement of the membrane-free electrolysis process of hydrogen and oxygen production

Rusanov¹,

Solovey²,

Zipunnikov³

2021

Nauk. visn. nat. hirn. univ.

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Renewable energy sources provide an unstable energy flow to the units of an autonomous energy complex. Therefore, in order to use the electrolyzer as an element of the considered complex, it is necessary to determine the optimal range of changes in the current density and evaluate the effect of operating characteristics of the electrolysis process on the evolution of H2 (O2) when the electrolyzer power supply is disconnected for 13 seconds against the background of a continuous base current level. Purpose. The main purpose of the research is to determine the rational range of changes in the current density supplied to a monopolar membrane-free high-pressure electrolyzer, as well as to determine the effect of a discrete current supply on electrochemical reactions during electrolysis. Methodology. Comprehensive studies on the electrochemical processes of water decomposition in alkaline electrolyte with the formation of hydrogen and oxygen in an experimental construction make it possible to cyclically supply power to the electrolyzer with visual control of the considered processes. Findings. The technology of cyclic generation of hydrogen and oxygen, which eliminates the need to use separating ion-exchange membranes, is considered. A rational range of changes in the current density on a membrane-free monopolar high-pressure electrolyzer with the usage of electrodes made of metals with variable valence is established. The influence of the discrete supply of electrical energy to the electrolysis cell is determined depending on the electrochemical reactions occurring on the active iron electrode. Theoretical values of the voltage of the oxidation and reduction of the iron electrode active mass, as well as the voltage on the half-cycle of hydrogen evolution during the electrolysis of water, are calculated. Originality. An increase in the blackout time from 1 to 3 s leads to a corresponding increase in time of the oxidation process on the hydrogen half-cycle by a factor of 2.4. In addition, the total amount of hydrogen (oxygen) released during the corresponding half-cycles remains unchanged and amounts to Practical value. The optimal range of current density for the operation of a membrane-free high-pressure electrolyzer is in the range of 200400 A/m2. Under such conditions, an intense redox process of the iron electrode active mass occurs. Electrical energy consumption in this case is in the range of 3.94.1 kW h/m3. An experimental study on the electrolyzer discrete power supply effect on its ability to generate gas is carried out. This makes it possible to supply electrical energy to the electrolysis cell directly from the primary energy source (sun, wind) as part of the energy technology complex.

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Estimation of lifespan and economy parameters of steam-turbine power units in thermal power plants using varying regimes

Cited by 16 publications

References 3 publications

Techno-Economic Assessment of Coal-Fired Power Unit Decarbonization Retrofit with KP-FHR Small Modular Reactors

Techno-Economic Assessment of Coal-Fired Power Unit Decarbonization Retrofit with KP-FHR Small Modular Reactors

Retrofit Decarbonization of Coal Power Plants—A Case Study for Poland

Improvement of the membrane-free electrolysis process of hydrogen and oxygen production

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