Advanced Ultra-Supercritical Coal-Fired Power Plant with Post-Combustion Carbon Capture: Analysis of Electricity Penalty and CO2 Emission Reduction

Tramošljika, Branimir; Blecich, Paolo; Bonefačić, Igor; Glažar, Vladimir

doi:10.3390/su13020801

Cited by 35 publications

(19 citation statements)

References 41 publications

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“…Developing the clean utilization of fossil energy and improving the clean conversion efficiency of fossil energy can greatly reduce the energy carbon emissions of Taiyuan. This process needs an orderly withdrawal of traditional coal-fired power plants (Tramošljika et al, 2021) from the market with increased investment in energy Frontiers in Environmental Science frontiersin.org 13 infrastructure to expand the share of non-fossil energy in the market. In the long run, clean energy is likely to have higher total economic returns than fossil fuels (Hao et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Pathways for the carbon peak of resource-based cities under an energy-water coupling relationship: A case study of Taiyuan, Shanxi Province

Lin

Jiang

et al. 2022

Front. Environ. Sci.

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The “dual carbon” goal proposes new requirements for urban development, and the contradiction between high-speed urban development and environmental problems is becoming increasingly critical. The path of green and low-carbon development urgently needs to be investigated. In this paper, a simulation system of urban carbon emission based on system dynamics is built from four perspectives of population, economy, water resources and energy, aiming at building a method system for carbon peak path that is universally applicable to resource-based cities from a systematic perspective. This paper designs five scenarios: business as unusual scenario (BAU), adjustment of industrial structure (CPA1), adjustment of energy structure (CPA2), reduce energy consumption per unit of GDP (CPA3) and comprehensive management (CPAcomprehensive). Compared with the other four scenarios, the comprehensive scenario had the best coordination benefit for the coupling system, which took into account economic development, resource consumption and carbon emission reduction and could promote the realization of a carbon peak in Taiyuan city in 2029, and the comprehensive scenario will reduce CO2 by 17.14 million tons, water consumption by 158 million m3, energy consumption by 5.58 million tons of standard coal and economic growth by 175.21 billion yuan in 2029.

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Section: Discussionmentioning

confidence: 99%

Pathways for the carbon peak of resource-based cities under an energy-water coupling relationship: A case study of Taiyuan, Shanxi Province

Lin

Jiang

et al. 2022

Front. Environ. Sci.

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“…The base superheating temperature in the current study is 600°C, [27][28][29] and the base boiler pressure in the current study is 50 bara. 30,31 Other fixed operational conditions are the condenser pressure, which is set to 0.125 bara. 32 The condenser operates under saturation conditions, which means that specifying a constant pressure value implies also a specified constant temperature of water inside the condenser, which is gradually transformed from a liquid-vapor mixture state into a fully-liquid (saturated liquid) state.…”

Section: Goal Of the Studymentioning

confidence: 99%

Subcritical and supercritical Rankine steam cycles, under elevated temperatures up to 900°C and absolute pressures up to 400 bara

Marzouk

2024

Advances in Mechanical Engineering

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The Rankine cycle is a conceptual arrangement of four processes as a closed vapor power thermodynamic cycle, where a working fluid (especially water as a liquid, as a vapor, and as a liquid-vapor mixture) can be used to convert heat into mechanical energy (shaft rotation). This cycle and its variants are widely used in electric power generation through utility-scale thermal power plants, such as coal-fired power plants and nuclear power plants. In the steam-based Rankine cycle, water should be pressurized and heated to be in the form of very hot high-pressure water vapor called “superheated steam,” before the useful process of expansion inside a steam turbine section occurs. If the absolute pressure and temperature of the superheated steam are both above the critical values for water (220.6 bara and 374.0°C), the cycle is classified as “supercritical.” Otherwise, the cycle is classified as “subcritical.” This study considers the impact of the temperature and pressure, independently, on the performance of a steam Rankine cycle. Starting from a representative condition for a subcritical cycle (600°C peak temperature and 50 bara peak absolute pressure), either the peak temperature or the peak absolute pressure of the cycle is increased with regular steps (up to 900°C, with a temperature step of 50°C, and up to 400 bara, with a pressure step of 50 bar). The variation of five scale-independent performance metrics is investigated in response to the elevated temperature and the elevated pressure. Thus, a total of 10 response curves are presented. When the temperature increased, all the five response variables were improved in a nearly linear profile. On the other hand, increasing the pressure did not give a monotonic linear improvement for each response variable. In particular, the cycle efficiency seemed to approach a limiting maximum value of 45% approximately, where further increases in the pressure cause diminishing improvements in the efficiency. When varying the peak pressure, an optimum minimum ratio of (water-mass-to-output-power) is found at 203 bara, although the cycle efficiency still increases beyond this value. In the present research work, the web-based tool for calculating steam properties by the British company Spirax Sarco Limited, and the software program mini-REFPROP by NIST (United States National Institute of Standards and Technology) were used for finding the necessary specific enthalpies (energy content) of water at different stages within the steam cycle. Both tools were found consistent with each other, as well as with the Python-based software package Cantera for simulating thermo-chemical-transport processes. The results showed that if the peak temperature reaches 900°C, a gain of about 5 percentage points (pp) in the thermal cycle efficiency becomes possible (compared to the case of having a base peak temperature of 600°C), as the predicted efficiency was found to increase from 38.60% (base case) to 43.67%. For the influence of the steam peak pressure, operating in the subcritical regime but close to the critical point appears to be a good choice given the gradual decline in efficiency gains at higher pressures. About 4.7 percentage point increase was found at the high subcritical peak pressure of 200 bara (compared to a base subcritical peak pressure of 50 bara). The results of this study also showed that the liquid water droplet mass fraction at the steam turbine exit diminishes from 11.00% at 600°C to only 1.48% at 900°C, which is favorable. This mass fraction grows from 11.00% at 50 bara to 27.89% at 400 bara, which is not acceptable. Every 100°C increase in the superheating temperature between 600°C and 900°C was found to cause aa increase in the cycle thermal efficiency by about 1.69 percentage points, and simultaneous a beneficial increase in the steam quality at the turbine exit by about 3.17 percentage points.

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“…In order to achieve higher efficiency and reduce CO2 emissions, the working fluid of the boiler will be operated at higher temperatures and pressures. In the next decade, Advanced ultra-supercritical power plants (A-USC) are expected to enter operation and will approach 50% net electricity generation efficiency with the use of advanced metal alloys capable of withstanding steam temperatures and pressures over 700 o C and 350 bar (Tramošljika et al, 2021). The usage of carbon steels that are widely used for a wide range Prepared by a Flame Spraying Technique of industrial applications, such as boiler and pressure vessel fabrication, may become limited when applied at high temperatures and oxidative atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Oxidation Resistance of MoSi2 Added FeCrAlTiY Coatings on ST41 Steel at 700oC Prepared by a Flame Spraying Technique

Pane¹,

Simbolon²,

Izzudin³

et al. 2023

IJTech

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Advanced power generation will be operated at higher temperatures and pressure to achieve higher efficiency and reduce CO2 emission. This may significantly impact the use of carbon steel that previously has been used in boiler fabrication. In this study, a flame spraying technique was applied to develop a highly resistant coating of MoSi2 added FeCrAlTiY on ST41 steel to improve its oxidation resistance. Four variations of MoSi2 concentration as 0, 10, 20 and 30 in mass% were prepared to investigate the effect of its addition on the cyclic oxidation resistance of FeCrAlTiY coating at 700 o C for 8 cycles. The phase composition and microstructure of the coating before and after the oxidation test were analyzed using XRD and SEM, respectively. While the element distribution along the coating was characterized using an EDX. According to the results, partially and fully melted particles, oxides and pores are present in the coatings. It becomes more porous with the increase of MoSi2 concentration. The oxidation test results indicate that the FeCrAlTiY with 10 mass% MoSi2 addition exhibits the lowest mass gain (0.217 mg/mm 2 ) compared to that of MoSi2free coating (0.261 mg/mm 2 ) and FeCrAlTiY coating with 20 and 30 mass% MoSi2 (0.297 and 0.308 mg/mm 2 , respectively). As the MoSi2 concentration increases, its addition leads to the deterioration of FeCrAlTiY coating oxidation resistance. The results suggest that FeCrAlTiY-10 mass% MoSi2 is the most resistant coating to cyclic oxidation at 700 o C in air and can be applied as a protective coating in advanced power generation.

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Advanced Ultra-Supercritical Coal-Fired Power Plant with Post-Combustion Carbon Capture: Analysis of Electricity Penalty and CO2 Emission Reduction

Cited by 35 publications

References 41 publications

Pathways for the carbon peak of resource-based cities under an energy-water coupling relationship: A case study of Taiyuan, Shanxi Province

Pathways for the carbon peak of resource-based cities under an energy-water coupling relationship: A case study of Taiyuan, Shanxi Province

Subcritical and supercritical Rankine steam cycles, under elevated temperatures up to 900°C and absolute pressures up to 400 bara

Cyclic Oxidation Resistance of MoSi2 Added FeCrAlTiY Coatings on ST41 Steel at 700oC Prepared by a Flame Spraying Technique

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