Theoretical analysis and comparison on supercritical CO2 based combined cycles for waste heat recovery of engine

Pan, Mingzhang; Zhu, Yan; Bian, Xingyan; Liang, Youcai; Lu, Fulu; Ban, Zhibo

doi:10.1016/j.enconman.2020.113049

Cited by 69 publications

(16 citation statements)

References 40 publications

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“…6 This cycle can well match various types of heat sources and can be applied in many fields, such as nuclear power, [10][11][12] solar power, [13][14][15] thermal power, [16][17][18] and waste heat recovery. [19][20][21] At the same time, the SCO 2 cycle has high efficiency, compactness, and low noise. Liu et al 5 compared the thermodynamic performance of CPUs with SCO 2 Brayton cycle and units with steam Rankine cycle.…”

Section: Introductionmentioning

confidence: 99%

“…Since the beginning of the 21st century, the SCO 2 power cycle has re‐entered people's awareness with the development of the fourth generation nuclear reactor (Gen IV, core temperature 500‐900°C) 6 . This cycle can well match various types of heat sources and can be applied in many fields, such as nuclear power, 10‐12 solar power, 13‐15 thermal power, 16‐18 and waste heat recovery 19‐21 . At the same time, the SCO 2 cycle has high efficiency, compactness, and low noise.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic and economic comparison of supercritical carbon dioxide coal‐fired power system with different improvements

et al. 2021

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The supercritical carbon dioxide (SCO 2 ) Brayton cycle is expected to become the new generation of power cycle for coal-fired power units. Most previous studies on system and parameter optimizations of SCO 2 power systems aimed to improve thermal performance, and some of them also involved the economic performance evaluation of the configurations they proposed. However, the configurations included in previous economic analyses are limited, and the models used in different papers are different. Although many improved configurations of SCO 2 coal-fired power generation system have been proposed, currently, there is a lack of comparison under the unified thermal-economic evaluation standard. Thus, this study focuses on the economic optimization and comparison of the performances of different advanced configurations of SCO 2 coal-fired power systems under the unified standard. Thermodynamic and economic optimization models are developed, and various configurations are proposed, representing improvements from four aspects (mediumtemperature flue gas heat utilization, reheating, waste heat recovery, and main compressor intercooling) based on a recompression system. The system parameters are also economically optimized with the genetic algorithm. Results show that integrating the SCO 2 benchmark cycle, medium temperature economizer, single-reheat, flue bypass, low temperature economizer and main compressor intercooling into the coal-fired power unit yields excellent thermo-economic performance. This configuration has the highest power generation efficiency of 47.93% and the lowest levelized cost of electricity of 0.0540 USD kW −1 hour −1 compared to others. Furthermore, the influences of specific parameters on power generation cost are analyzed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic and economic comparison of supercritical carbon dioxide coal‐fired power system with different improvements

et al. 2021

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“…Note that, despite the fact that the literature presents a large number of innovative technologies to recover the ICE's waste heat (see, e.g., Kalina cycle [62] and super-critical CO 2 cycle [63]), acceptable performance improvements and techno-economic feasibility are today reachable only with WHRUs based on the steam and the organic Rankine cycle.…”

Section: Case Study and Optimization Settingsmentioning

confidence: 99%

The IRC-PD Tool: A Code to Design Steam and Organic Waste Heat Recovery Units

et al. 2021

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The Algerian economy and electricity generation sector are strongly dependent on fossil fuels. Over 93% of Algerian exports are hydrocarbons, and approximately 90% of the generated electricity comes from natural gas power plants. However, Algeria is also a country with huge potential in terms of both renewable energy sources and industrial processes waste heat recovery. For these reasons, the government launched an ambitious program to foster renewable energy sources and industrial energy efficiency. In this context, steam and organic Rankine cycles could play a crucial role; however, there is a need for reliable and time-efficient optimization tools that take into account technical, economic, environmental, and safety aspects. For this purpose, the authors built a mathematical tool able to optimize both steam and organic Rankine units. The tool, called Improved Rankine Cycle Plant Designer, was developed in MATLAB environment, uses the Genetic Algorithm toolbox, acquires the fluids thermophysical properties from CoolProp and REFPROP databases, while the safety information is derived from the ASHRAE database. The tool, designed to support the development of both RES and industrial processes waste heat recovery, could perform single or multi-objective optimizations of the steam Rankine cycle layout and of a multiple set of organic Rankine cycle configurations, including the ones which adopt a water or an oil thermal loop. In the case of the ORC unit, the working fluid is selected among more than 120 pure fluids and their mixtures. The turbines’ design parameters and the adoption of a water- or an air-cooled condenser are also optimization results. To facilitate the plant layout and working fluid selection, the economic analysis is performed to better evaluate the plant economic feasibility after the thermodynamic optimization of the cycle. Considering the willingness of moving from a fossil to a RES-based economy, there is a need for adopting plants using low environmental impact working fluids. However, because ORC fluids are subjected to environmental and safety issues, as well as phase out, the code also computes the Total Equivalent Warming Impact, provides safety information using the ASHRAE database, and displays an alert if the organic substance is phased out or is going to be banned. To show the tool’s potentialities and improve the knowledge on waste heat recovery in bio-gas plants, the authors selected an in-operation facility in which the waste heat is released by a 1 MWel internal combustion engine as the test case. The optimization outcomes reveal that the technical, economic, environmental, and safety performance can be achieved adopting the organic Rankine cycle recuperative configuration. The unit, which adopts Benzene as working fluid, needs to be decoupled from the heat source by means of an oil thermal loop. This optimized solution guarantees to boost the electricity production of the bio-gas facility up to 15%.

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“…The SCO 2 cycle also has the advantages of a compact structure and good heat source matching performance, and can be widely used in nuclear energy [5][6][7], waste heat recovery [8][9][10], solar energy [11][12][13], and thermal power [14][15][16]. A lot of work has been done on the basic thermodynamic research of the SCO 2 cycle, configuration and parameter optimizations, system design in different application fields, and even economic analysis and optimization.…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Modeling of the Supercritical Carbon Dioxide Power Cycle

et al. 2021

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The supercritical carbon dioxide (SCO2) Brayton cycle, as a substitute for the steam cycle, can be widely used in a variety of power generation scenarios. However, most of the existing SCO2 cycle studies are restricted to basic thermodynamics research, parameter optimizations, system design in different application fields, and even economic analysis. Considering the load variability and control flexibility of the power generation system, the dynamic performance research of the SCO2 cycle is also crucial, but the work done is still limited. Based on the previous studies, Simulink software is used in this paper to develop a dynamic model of the 20 MW-SCO2 recompression cycle, which specifically includes component models that can independently realize physical functions and an overall closed-loop cycle model. A series of comparative calculation are carried out to verify the models and the results are very positive. The SCO2 recompression power system is built with the developed models and the dynamic model runs stably with a maximum error of 0.56%. Finally, the simulation of the dynamic switching conditions of the 20 MW-SCO2 recompression cycle are performed and the analysis results supply instructive suggestions for the system operation and control.

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Theoretical analysis and comparison on supercritical CO2 based combined cycles for waste heat recovery of engine

Cited by 69 publications

References 40 publications

Thermodynamic and economic comparison of supercritical carbon dioxide coal‐fired power system with different improvements

Thermodynamic and economic comparison of supercritical carbon dioxide coal‐fired power system with different improvements

The IRC-PD Tool: A Code to Design Steam and Organic Waste Heat Recovery Units

Research on Dynamic Modeling of the Supercritical Carbon Dioxide Power Cycle

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