Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods

Zhu, Yong; Zhai, Rongrong; Peng, Hao; Yang, Yongping

doi:10.1016/j.applthermaleng.2016.07.116

Cited by 67 publications

(33 citation statements)

References 17 publications

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“…Its results showed that the maximum exergy and energy efficiencies for optimum flow rate values of 2.76% and 48.1%, respectively. In 2016, Zhu et al performed studies on exergy analysis of a solar tower coupled with a fossil fuel power generator. In this study, exergy performance and exergy losses analysis were done for each component.…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of a hybrid solar‐fossil fuel power plant

Vakilabadi

Bidi

Najafi

et al. 2019

Energy Science & Engineering

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In this study, exergy analysis, energy analysis, and mathematical modeling are performed in a 35 MW solar‐fossil fuel power plant. The losses of exergy and energy in different components and also changes of the efficiency of exergy and energy are analyzed at a specific day, 20th June. The assumed power plant in this study is Solar Electric Generating Station VI (SEGS VI), located in California's Mojave Desert. A parametric study, under different working conditions, including different working pressures, temperatures, collector output temperature, steam flow rate, and heat transfer fluid (HTF) flow rate is studied and the effect of variation of parameters on the performance of the plant is investigated. Authors found that, the maximum exergy loss happens in the collector and the maximum energy loss occurs in the condenser. Energy analysis shows that 47% of the total loss energy in the cycle happens in the condenser, as the main component that wastes energy. From exergy analysis, the collector and then boiler are the main components wasting exergy where 68.32% of total exergy loss occurs in these two components in hybrid mode (solar‐fossil fuel). Exergy and Energy efficiency variations throughout the day show that minimum exergy efficiency (32.7%) and maximum energy efficiency (23%) occurs at 12 am. Exergy efficiency variation versus turbine inlet pressure shows that the maximum exergy efficiency (26%) accure at 95 bar. The changes of the absorbed heat and solar irradiation of the 20th of June shows a good agreement with the measured data in validated reference.

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Section: Introductionmentioning

confidence: 99%

Exergy analysis of a hybrid solar‐fossil fuel power plant

Vakilabadi

Bidi

Najafi

et al. 2019

Energy Science & Engineering

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“…In practical applications, the introduction of solar energy into coal‐fired power plants will bring transient heat flow changes, which will bring great challenges for the control and operation of boilers, steam turbines, and thermal systems. Research on the dynamic characteristics of SAPG is of great significance for coupling renewable energy with traditional coal‐fired generating units …”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of a solar‐aided coal‐fired power generation system under direct normal irradiance (DNI) feedforward control

Pang

Duan

et al. 2019

Energy Science & Engineering

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A solar‐aided coal‐fired power generation (SAPG) system is a new type of power generation system in the field of solar thermal power generation. However, the instability of solar radiation will cause fluctuations in steam temperature, which is unfavorable for the operation of boilers and steam turbines. Based on a 600 MW subcritical coal‐fired power generation unit, TRNSYS software is applied to establish a transient simulation model of SAPG in this paper. A dynamic feedforward control system for steam temperature is set up. Some essential parameters, such as the fuel consumption rate, solar‐heated steam extraction rate, water spraying flow rate, and flue gas damper opening, are under the control of direct normal irradiance (DNI). Then, the dynamic characteristics of SAPG are analyzed using typical weather data. The simulation results show that under the fuel‐saving mode, when solar irradiation changes, the SAPG system achieves a coal reduction of 4.9% by using the steam temperature control system with DNI feedforward control, and the main steam temperature fluctuation is less than 5°C with the reheat steam temperature reduced within a reasonable range. The power generation fluctuation is less than 10 MW, and the solar‐to‐electricity efficiency reaches 22.5%. Some parameters on both the flue gas side and the water/steam side in the utility boiler are simulated to demonstrate the effectiveness of DNI control.

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“…In order to reduce the distances between CPG and STCG technologies, partial or total price difference should be covered by the introduction of solar subsidies. Apart from the cost of electricity generation on STCG plants, there is another aspect to be considered, and it is about the CO 2 emissions, for the case of the CPG reference plant, these are of 110 million tons per year, while for the case of STCG plant they are reduced to 97 million tons per year (calculated considering real coal [29]). Resulting in a saved 13 million tons of CO 2 emissions which translates into an important reduction on carbon capture costs [54][55][56] for the STCG of 0.48 cents USD/kWh compared to the CPG plant.…”

Section: Policy-making Proposalsmentioning

confidence: 99%

“…reduction of about 13,125,410 t (107.7 g/kWh in a whole life cycle). When calculating CO2 emission, a kind of real coal is used [29].…”

Section: Financial Analysismentioning

confidence: 99%

Techno-Economic Analysis of Solar Tower Aided Coal-Fired Power Generation System

et al. 2017

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Abstract:In this paper, we conduct a techno-economic analysis of a 1000 MWe solar tower aided coal-fired power generation system for the whole life cycle. Firstly, the power output (from coal and solar thermal energy) under variable direct normal irradiance and grid demand are studied. Secondly, a financial assessment is performed, including profits and losses of the plant project. Thirdly, sensitivity analysis is taken on some external factors that can affect the cost or profits and losses of the plant project. The results indicate that the project has high profits with an internal rate of return (IRR) of 8.7%. In addition, the effects of solar tower field cost, power purchase agreement (PPA) price of solar thermal electricity, coal price, and the interest rate of debt on the main criteria decrease gradually. Therefore, it is better to improve solar tower technology first, and then look for low-interest debts from banks to cope with the reduction of PPA price of solar thermal electricity and the increase of coal price. Despite the introduction of solar tower field increasing levelized cost of electricity (LCOE), it contributes to the reduction of CO 2 capture cost compared to the case of standard coal-fired power plants.

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Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods

Cited by 67 publications

References 17 publications

Exergy analysis of a hybrid solar‐fossil fuel power plant

Exergy analysis of a hybrid solar‐fossil fuel power plant

Dynamic characteristics of a solar‐aided coal‐fired power generation system under direct normal irradiance (DNI) feedforward control

Techno-Economic Analysis of Solar Tower Aided Coal-Fired Power Generation System

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