Design and simulation analysis of high-temperature heat-storage combined-circulation system

Abstract In view of the continuous increase in the proportion of renewable energy connected to the grid in China and the increasing peak-to-valley difference in electricity demand on the power grid, this paper proposes a high-temperature thermal-storage combined-cycle power-generation system. Using Thermoflex thermal simulation analysis software, a high-temperature thermal-storage combined-cycle simulation analysis system model was established, and the influence of different initial temperatures and pressure ratios on the combined-cycle system was analysed. Sensitivity analysis of factors such as electricity cost, annual operating hours, initial equipment investment, unit efficiency and other factors that affect the net income of the system was carried out. According to the current power-peak-shaving auxiliary service market in China, it is pointed out that high-temperature thermal-storage combined-cycle projects must be profitable and obtain good economic benefits. The results obtained, on the one hand, provide suggestions for the flexibility and transformation of current gas-fired steam generators for peak shaving and, on the other hand, provide references for the subsequent development of high-temperature thermal-storage combined-cycle demonstration projects.

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V2B/V2G on Energy Cost and Battery Degradation under Different Driving Scenarios, Peak Shaving, and Frequency Regulations

World Electric Vehicle Journal ◽

10.3390/wevj11010014 ◽

2020 ◽

Vol 11 (1) ◽

pp. 14 ◽

Cited By ~ 1

Author(s):

Alain Tchagang ◽

Yeong Yoo

Keyword(s):

Energy Cost ◽

Economic Benefits ◽

Frequency Regulation ◽

Optimization Strategy ◽

Peak Shaving ◽

Vehicle To Grid ◽

Electricity Cost ◽

Battery State Of Charge ◽

Battery Degradation ◽

Operational Constraints

The energy stored in electric vehicles (EVs) would be made available to commercial buildings to actively manage energy consumption and costs in the near future. These concepts known as vehicle-to-building (V2B) and vehicle-to-grid (V2G) technologies have the potential to provide storage capacity to benefit both EV and building owners respectively, by reducing some of the high cost of EVs, buildings’ energy cost, and providing reliable emergency backup services. In this study, we considered a vehicle-to-buildings/grid (V2B/V2G) system simultaneously for peak shaving and frequency regulation via a combined multi-objective optimization strategy which captures battery state of charge (SoC), EV battery degradation, EV driving scenarios, and operational constraints. Under these assumptions, we showed that the electricity usage/bill can be reduced by a difference of 0.1 on a scale of 0 to 1 (with 1 the normalized original electricity cost), and that EV batteries can also achieve superior economic benefits under controlled SoC limits (e.g., when kept between the SoC range of SoCmin > 30% and SoCmax < 90%) and subjected to very restricted charge-discharge battery cycling.

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Peak Shaving and Frequency Regulation Coordinated Output Optimization Based on Improving Economy of Energy Storage

Electronics ◽

10.3390/electronics11010029 ◽

2021 ◽

Vol 11 (1) ◽

pp. 29

Author(s):

Daobing Liu ◽

Zitong Jin ◽

Huayue Chen ◽

Hongji Cao ◽

Ye Yuan ◽

...

Keyword(s):

Energy Storage ◽

Control Method ◽

Economic Benefits ◽

Economic Problem ◽

Frequency Regulation ◽

Cost Models ◽

Optimization Strategy ◽

Economic Optimization ◽

Peak Shaving ◽

Electricity Cost

In this paper, a peak shaving and frequency regulation coordinated output strategy based on the existing energy storage is proposed to improve the economic problem of energy storage development and increase the economic benefits of energy storage in industrial parks. In the proposed strategy, the profit and cost models of peak shaving and frequency regulation are first established. Second, the benefits brought by the output of energy storage, degradation cost and operation and maintenance costs are considered to establish an economic optimization model, which is used to realize the division of peak shaving and frequency regulation capacity of energy storage based on peak shaving and frequency regulation output optimization. Finally, the intra-day model predictive control method is employed for rolling optimization. An intra-day peak shaving and frequency regulation coordinated output optimization strategy of energy storage is proposed. Through the example simulation, the experiment results show that the electricity cost of the whole day is reduced by 10.96% by using the coordinated output strategy of peak shaving and frequency regulation. The obtained further comparative analysis results and the life cycle economic analysis show that the profit brought by the proposed coordinated output optimization strategy is greater than that for separate peak shaving or frequency modulation of energy storage under the same capacity.

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Integration of High Performance Power Systems (HIPPS) Into Vision 21

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/2000-gt-0027 ◽

2000 ◽

Cited By ~ 1

Author(s):

Fred L. Robson ◽

John D. Ruby ◽

Daniel J. Seery

Keyword(s):

High Temperature ◽

Power Systems ◽

Gas Turbines ◽

High Performance ◽

High Efficiency ◽

Economic Benefits ◽

Combined Cycle ◽

Advanced Technology ◽

Environmental Research ◽

Research Center

The U.S. Department of Energy/Federal Energy Technology Center (DOE/FETC)-sponsored High Performance Power Systems (HIPPS) program headed by United Technologies Research Center has identified coal-based combined-cycle power systems using advanced technology gas turbines that could operate at efficiencies approaching 55% (HHV). The HIPPS uses a High Temperature Advanced Furnace (HITAF) to preheat combustion turbine air. The HITAF’s metallic air heaters include a radiator section located in the furnace slagging zone and a convection section located in the downstream portion. The compressor discharge air is heated to 925 C – 1150 C. Additional heat for the turbine, if required in the cycle, is added by special low-NOx gas-fired combustors. The HITAF design has been successfully tested at the desired temperatures for short durations at the Energy and Environmental Research Center, Grand Forks, ND, with tests continuing to expand the systems experience and capabilities. The HIPPS concept with its HITAF advanced air heater are valuable technology candidates for integration into Vision 21, the DoE’s evolving plan to utilize coal and other fossil fuels in energy complexes producing power, chemicals, process heat and other byproducts. For example, the HIPPS would be combined with high temperature fuel cells, e.g., the solid oxide fuel cell (SOFC), resulting in power systems having overall electrical efficiencies greater than 60% (HHV) with 50% or more of the energy input from coal. These power plants would have near zero emissions with a goal for power costs 10% below current coal-fired systems. Emissions of CO2, an important greenhouse gas, will be drastically reduced by the higher efficiencies of HIPPS cycles. Very important from a power and coproduction market viewpoint, HIPPS can be an attractive repowering technology. This will allow Vision 21 technology to be used in those plants that seek to continue using coal and other alternative solid fuels to capture the economic benefits of their low energy costs. Here, HIPPS adds high efficiency; increased capacity; load following and dispatching flexibility, as well as important environmental benefits to sites having existing fuel and transmission infrastructure.

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Parameter and layout optimization of a high temperature solar combined cycle using low temperature thermal storage

Environmental Progress & Sustainable Energy ◽

10.1002/ep.12564 ◽

2017 ◽

Vol 36 (4) ◽

pp. 1234-1243 ◽

Cited By ~ 4

Author(s):

Wei Gao ◽

Hongzhi Li ◽

Peng Nie ◽

Yifang Zhang ◽

Yu Yang ◽

...

Keyword(s):

High Temperature ◽

Low Temperature ◽

Thermal Storage ◽

Layout Optimization ◽

Combined Cycle

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TRANSIENT ANALYSIS OF HEAT TRANSFER IN PARALLEL SQUARED CHANNELS FOR HIGH TEMPERATURE THERMAL STORAGE

Computational Thermal Sciences An International Journal ◽

10.1615/computthermalscien.2016015327 ◽

2015 ◽

Vol 7 (5-6) ◽

pp. 477-489 ◽

Cited By ~ 4

Author(s):

Assunta Andreozzi ◽

Bernardo Buonomo ◽

Oronzio Manca ◽

Salvatore Tamburrino

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Transient Analysis ◽

Thermal Storage

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Coastal Scenic Beauty and Sensitivity at the Balearic Islands, Spain: Implication of Natural and Human Factors

Land ◽

10.3390/land10050456 ◽

2021 ◽

Vol 10 (5) ◽

pp. 456

Author(s):

Alexis Mooser ◽

Giorgio Anfuso ◽

Lluís Gómez-Pujol ◽

Angela Rizzo ◽

Allan T. Williams ◽

...

Keyword(s):

Climate Change ◽

Economic Benefits ◽

User Preferences ◽

Balearic Islands ◽

Future Climate Change ◽

Sensitivity Index ◽

Main Concern ◽

Human Pressure ◽

Continuous Increase ◽

Scenic Beauty

Coastal areas globally are facing a significant range of environmental stresses, enhanced by climate change-related processes and a continuous increase of human activities. The economic benefits of tourism are well-known for coastal regions, but, very often, conflicts arise between short-term benefits and long-term conservation goals. Among beach user preferences, five parameters of greater importance stand out from the rest, i.e., safety, facilities, water quality, litter and scenery; the latter is the main concern of this study. A coastal scenic evaluation was carried out in the Balearic Islands and focused on two major issues: coastal scenic beauty together with sensitivity to natural processes and human pressure. The archipelago is renowned as a top international coastal tourist destination that receives more than 13.5 million visitors (2019). Impressive landscape diversity makes the Balearics Islands an ideal field for this research. In total, 52 sites, respectively located in Ibiza (11), Formentera (5), Mallorca (18) and Menorca (18), were field-tested. In a first step, coastal scenic beauty was quantified using the coastal scenic evaluation system (CSES) method, based on the evaluation of 26 physical and human parameters, and using weighting matrices parameters and fuzzy logic mathematics. An evaluation index (“D”) was obtained for each site, allowing one to classify them in one of the five scenic classes established by the method. Twenty-nine sites were included in class I, corresponding to extremely attractive sites (CSES), which were mainly observed in Menorca. Several sound measures were proposed to maintain and/or enhance sites’ scenic value. In a second step, scenic sensitivity was evaluated using a novel methodological approach that makes possible the assessment of three different coastal scenic sensitivity indexes (CSSI), i.e., the natural sensitivity index NSI, the human sensitivity index HSI and the total sensitivity index TSI. Future climate change trends and projection of tourism development, studied at municipality scale, were considered as correction factors. All the islands showed places highly sensitive to environmental processes, while sensitivity to human pressure was essentially observed at Ibiza and Mallorca. Thereafter, sites were categorized into one of three sensitive groups established by the methodology. Results obtained are useful in pointing out very sensitive sceneries as well as limiting, preventing and/or anticipating future scenic degradation linked to natural and human issues.

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