Energy Conversion and Management最新文献_第3页

Incorporating large-scale economic-environmental-energy coupling assessment and collaborative optimization into sustainable product footprint management: A graph-assisted life cycle energy efficiency enhancement approach

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-14 DOI: 10.1016/j.enconman.2025.119616

Tingwei Zhang , Weimin Zhong , Yurong Liu , Renzhi Lu , Xin Peng

Product footprint management strategies for long-process manufacturing industries generally lack systematic analysis of the interactions between economic, emission, and energy footprints, leading to missed energy conservation and emission reduction opportunities. Accordingly, this paper develops a product economic-environmental-energy footprint coupling assessment and collaborative optimization framework, enabling more precise quantitative analysis and significantly reducing product carbon footprint. Specifically, an integrated model based on Life Cycle Cost (LCC) analysis, Life Cycle Assessment (LCA), and Multi-Regional Input-Output (MRIO) methods is designed to track the costs, energy consumption, and

C O_{2}

emissions accurately. Given that “end-to-end” footprint assessment methods generally failing to distinguish the sources of high costs, emissions, and energy consumption within the production process, a sub-process-based footprint coupling assessment method is introduced to systematically measure each product’s economic, environmental, and energy impacts. Furthermore, a graph-based multi-objective optimization framework for low-carbon and energy-efficient production layout is established to fully explore the potential for energy conservation, emission reduction, and cost savings. A case study applying the proposed model and methodology to a real-world refinery production site demonstrates that concentrated carbon conversion, allocation, and secondary release are the primary causes of high emissions. After layout optimization, diesel oil’s energy and emission footprints decreased by 71.4% and 73.9%, respectively, showing substantial energy conservation and emission reduction potential. The constructed low-carbon and energy-efficient production layout optimization framework significantly reduces the comprehensive footprint of products and contributes to the green transformation of the refineries.

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引用次数: 0

Electric-thermal collaborative system and control for hydrogen-fuel cell passenger trains in the UK’s winter

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-14 DOI: 10.1016/j.enconman.2025.119629

Zhan Xu , Ning Zhao , Yan Yan , Shigen Gao , Stuart Hillmansen

This paper presents a quantitative study on electric-thermal collaborative system for hydrogen-powered train, reutilising the waste heat from fuel cell system for Heating, Ventilation and Air Conditioning (HVAC). Firstly, a hybrid train simulator is developed to simulate the train’s motion state. Heat generation from fuel cell is estimated using a fuel cell model, while a detailed thermodynamic model for railway passenger coach is established to predict the heat demand. Furthermore, an electric-thermal collaborative energy management strategy (ETC-EMS) is proposed for the system to comprehensively optimise the on-train power distribution considering traction and auxiliary power. Finally, comparative analysis is performed among the train with electric heater (EH), heat pump (HP) and heat pump-heat reuse (HP-HR). The results demonstrate that, over a round trip, the proposed HP-HR with ETC-EMS recovers over 22.88% residual heat and saves 16.17% of hydrogen consumption. For the daily operation, it reduces hydrogen and energy consumption by 12.06% and 12.82 %, respectively. The findings indicate that collaborative optimisation brings significant improvements on the global energy utilisation. The proposed design with ETC-EMS is potential to further enhance the economic viability of hydrail and contributes to the rail decarbonisation.

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引用次数: 0

Techno-economic analysis of hydrogen production in the sugarcane industry by steam reforming of ethanol with carbon capture

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-13 DOI: 10.1016/j.enconman.2025.119635

Isaac Sousa Martins , Gabriel Fraga , Song Zhou , Aban Sakheta , Jerome Ramirez , Ian O’Hara

Renewable hydrogen production is a pivotal technology in transitioning to sustainable energy and is essential for global decarbonisation efforts. This study explores the integration of hydrogen production into sugarcane biorefineries, which have shifted from traditional sugar production to integrated bioenergy hubs. Specifically, steam reforming of ethanol was selected as the process for hydrogen generation. A comprehensive techno-economic analysis was developed to address research gaps and guide future work. A scenario of hydrogen production coupled with carbon capture was analysed, illustrating the potential to reduce the carbon footprint and utilise carbon dioxide for producing chemicals. The minimum selling price for hydrogen was determined to be 4.6 US$/kg for the base case scenario and 4.9 US$/kg for the comparison scenario with carbon capture, positioning it below the current average market price of 7.2 US$/kg. The capital and operating expenditures were determined to be US$ 273.1 million and 157.8 million for a 42,400 t/y hydrogen plant, and integrating carbon capture considering 282,800 t/y of carbon co-product yield was calculated at US$ 344.1 million and US$ 167.8 million, respectively. This dual approach of hydrogen production and carbon capture presents a strategy for implementing low-carbon processes that future biorefineries may consider. The primary impact highlighted by this integration is the enhancement of the sugarcane biorefineries’ value proposition, leveraging undervalued energy sources such as electricity and biogas. This study underscores the economic and environmental benefits of incorporating hydrogen production into sugarcane biorefineries on a large scale, offering a framework for future research and technological development.

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引用次数: 0

An efficient low-carbon hydrogen production system based on novel staged gasification coupling with chemical looping technology 基于新型分段气化耦合化学循环技术的高效低碳制氢系统

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-13 DOI: 10.1016/j.enconman.2025.119625

Shengping Zhang , Liangguo Lv , Luxuan Liu , Fei Dai , Jun Sui

Efficient hydrogen production and decarbonization through coal gasification still suffers from significant challenges. In this work, a novel and efficient low-carbon hydrogen production method via coal staged gasification coupling chemical looping technology was innovatively proposed, the method exhibits potential advantages in improving hydrogen production efficiency and achieving near-zero energy CO₂ capture. Moreover, the chemical recuperation method that efficiently recovers the exhaust heat of the system is also employed to further enhance the gasification efficiency. Thermodynamic analysis results indicate that the cold gas efficiency of staged coal gasification, composed of coal pyrolysis and coke-CO₂ gasification, reaches 85.04 %. By coupling chemical looping technology using FeO/Fe₃O₄ as an oxygen carrier, the corresponding hydrogen production efficiency achieves 65.32 %, with CO₂ enrichment concentration reaching 92.14 %, thereby enabling zero-energy CO₂ capture. Additionally, thermodynamic exergy balance analysis shows that the exergy efficiency of the new method for hydrogen production reaches approximately 64.51 %. The staged gasification, chemical looping, and heat exchange processes are identified as key contributors to exergy destruction. The energy utilization diagram methodology is used to further elucidate the mechanism of exergy destruction from the perspective of the level difference between the energy donor and the energy acceptor. Moreover, the new method is also compared with conventional coal-to-hydrogen gasification technology. This work can serve as significant guidance for the development of novel low-carbon coal gasification hydrogen production technologies.

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引用次数: 0

Energy efficient pretreatment for enhanced conversion of macroalgal biomass to bioenergy: Detailed energy and cost assessment

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-13 DOI: 10.1016/j.enconman.2025.119631

S. Kavitha , Yukesh Kannah Ravi , Rajeev Kumar Bhaskar , Amit K. Bajhaiya , J. Rajesh Banu

Macroalgal biomass disintegration through bacterial pretreatment is considered a time consuming, slower and mild energy consuming process. The resistant and less permeable cell wall of macroalgal biomass makes the bacterial pretreatment less energy efficient. The macroalgal biomass, Ulva sps. comprises a double layered cell wall. A novel attempt has been made in the present study to weaken the cell wall of macroalgae through a nonionic surfactant, Triton X 100 with subsequent pretreatment by cellulase secreting bacteria. An effective cell wall weakening of macroalgae without biomass disintegration (cell lysis) was achieved at an optimal surfactant dose of 0.005 g/g TS and 25 min treatment time. The cell wall weakened, macroalgal biomass (CWW + CE) was subjected to cellulase secreting bacterial pretreatment. The weakening of the cell wall increases the surface area for the enzyme secreting bacteria and makes the overall process energy efficient with greater methane production. The results of bacterial pretreatment showed that CWW + CE exhibited a higher organic release of 1400 mg/L and liquefaction of 25 %, when compared to cellulase secreting bacterially pretreated (CE) sample. The CE showed an organic release of 845 mg/L and liquefaction of 15.1 %, respectively. The results of biomethane production imply that CWW + CE revealed a greater biomethane yield of 0.222 L/g COD in comparison with CE (0.114 L/g COD). The CWW + CE was superior to CE, with a net energy production of 219.785 kWh/Ton.

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引用次数: 0

Development of a new CO2-rich natural gas to high-purity CO zero carbon emission system employing chemical looping process: Thermodynamic and environmental investigation

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-13 DOI: 10.1016/j.enconman.2025.119617

Zhulian Li , Junnan Zhan , Yu Fang , Peiying Chen , Taixiu Liu , Qibin Liu

Offshore natural gas (NG), as an important energy resource, has high CO₂ concentrations widely distributed from 20% to 80%. The effective conversion and utilization of these NG hold substantial environmental value. However, traditional NG conversion technologies, such as dry reforming of methane (DRM), cannot fully convert NG with such high CO₂ concentrations, often requiring decarbonization processes which causes significant energy loss and carbon emissions. In this work, a novel zero-carbon emission system for the efficient and environmentally friendly conversion of CO₂-rich NG is developed. Different from the traditional DRM route to produce syngas, the CO₂-rich NG is converted directly into high-purity CO through metal oxide oxygen carrier chemical looping reactions with CO₂ adsorption enhancement. Through the proposed method, a higher amount of CO₂ can be reduced per unit of methane, showing the capable advantage for higher CO₂ concentration NG. Based on the system configuration, key process experiments were conducted to validate the feasibility and advancement of the proposed system. Furthermore, system integration and parameter analysis were conducted to investigate the thermodynamic and environmental performance of the developed system, verifying its adaptability and conversion capability to various types of NG. The promising results show that, the novel system can convert NG with up to 63.50% CO₂ to CO with 99.10% purity. Compared to the DRM, the amount of CO₂ reduced per unit of CH₄ raises from 0.76 to 1.71, representing 1.25 times increase, with a 17.00% improvement in system energy efficiency. This research significantly improves the utilization efficiency and environmental sustainability of CO₂-rich fuels, such as CO₂-rich NG and biogas, providing a new pathway for reducing greenhouse gas emissions and high valorization utilization of CO₂.

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引用次数: 0

Hybrid process using cryogenic and pressure swing adsorption process for CO2 capture and extra H2 production from a tail gas in a steam methane reforming plant 利用低温和变压吸附混合工艺从蒸汽甲烷转化工厂的尾气中捕获二氧化碳并额外生产 H2

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-13 DOI: 10.1016/j.enconman.2025.119561

Younghyu Ko , Jun-Ho Kang , Hongjoo Do , Jaesung Kum , Chang-Ha Lee

Efficient technologies for fuel cell-grade H₂ recovery and CO₂ capture are required to meet the need for the carbon mitigation. In this study, a novel hybrid process consisting of cryogenic distillation and a two-stage pressure swing adsorption (PSA) process was developed to capture CO₂ and produce additional H₂ from the tail gas (2359 kmol/h and H₂:CO:CH₄:CO₂ = 27.2:6.7:17.7:48.4 mol%) of a vacuum pressure swing adsorption process in a commercial steam methane reforming plant. After validating mathematical models, a sensitivity analysis was conducted. Because the extract from the CO₂ removal PSA was recycled to cryogenic distillation, and the raffinate was provided to the H₂ purification PSA, it affected the performance and cost of the hybrid process. Since the high interconnectivity and complexity of the hybrid process led to a very long computational time, this study developed multiple deep neural network (DNN) models using 789 case results. DNN-based optimization for a minimum separation cost was conducted with constraints: CO₂ capture rate of > 90 % and fuel cell-grade H₂ purity of ≥ 99.999 % (≤ 0.2 ppm CO). According to techno-economic analysis, the hybrid process could achieve a separation cost of 4.11 USD/kgH₂ and a CO₂ capture cost of 72.68 USD/tonCO₂. Considering extra blue H₂ production, the CO₂ capture cost was significantly reduced in the range of 50.57 to 36.02 USD/tonCO₂, depending on the H₂ production cost provided from the DOE report (1.43 to 2.27 USD/kgH₂). Because this novel hybrid process can be installed downstream without revamping an existing steam methane reforming plant, it can be regarded as a competitive option for CO₂ capture and additional H₂ recovery.

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引用次数: 0

A comprehensive comparison of three renewable natural gas production technologies: Energy, exergy, economic, and environmental assessments

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-12 DOI: 10.1016/j.enconman.2025.119615

Yu Zhang, Mingjing Fan, HaoZe Wang, Hao Wang, Youjun Lu

This study aims to conduct a comprehensive comparison of three technologies for producing renewable natural gas (RNG) from biomass, evaluating their technical, economic, and environmental perspectives: (i) Catalytic hydrothermal gasification (CHG) technology; (ii) Gasification and methanation (G&M) technology; (iii) Anaerobic digestion (AD) technology. Energy analysis reveals that the CHG system achieves the highest energy efficiency (81.30 %), attributed to its superior energy recovery and utilization capabilities. The AD system exhibits 50.17 % lower energy efficiency compared to the CHG system, primarily due to incomplete biomass conversion into biogas. Exergy analysis indicates that the CHG system demonstrates the highest exergy efficiency (63.38 %). The reaction unit constitutes the primary source of exergy losses across the three RNG production systems. Energy utilization diagram (EUD) analysis of the RNG production reaction in the CHG and G&M systems reveals that the CHG system experiences lower exergy losses, owing to its single-step conversion and milder reaction conditions. Economic evaluation highlights that the CHG system offers the most favorable economic performance, driven by its moderate investment cost (24.50 M€), high RNG and steam production, and a competitive RNG break-even cost of 0.41 €/Nm³. Raw material costs and by-product steam prices are critical factors influencing the economic viability of the process. Life cycle assessment reveals that the CHG and G&M systems exhibit superior environmental performance, whereas the AD system performs poorly due to the significant volume of digestate requiring treatment.

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引用次数: 0

A coupling and multi-mode thermal management system design and control for high-power fuel cell vehicles with utilizing waste heat

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-12 DOI: 10.1016/j.enconman.2025.119590

Zhongwen Zhu , Xin Wang , Weihai Jiang , Weizhi Wang , Cheng Li , Shuhua Li

In recent years, the thermal management system of fuel cell vehicles has garnered significant attention due to its profound impact on the overall economy, environmental adaptability, and vehicle durability. In this study, an integrated thermal management system utilizing waste heat for fuel cell vehicles was developed to improve the environmental adaptability and energy efficiency. The system integrates multiple thermal management system loops, including fuel cell system, battery, electric drive system, and cabin. A heat exchanger was designed to achieve the recovery of waste heat from fuel cell and efficient management of each loop. The integrated design of a six-way valve can enable flexible decoupling management of multiple heat management loops and rational utilization of waste heat from the electric drive system. Additionally, an active disturbance rejection control (ADRC) for energy consumption optimization was proposed to address the high energy consumption of electrical accessories in fuel cell thermal management and the external thermal disturbances introduced by heat exchangers. For the integrated thermal management of the battery and electric drive system, a PID following mode control strategy was implemented. To address cabin thermal management challenges under various vehicle speed conditions, a fuzzy-PID cabin thermal management control strategy was proposed. Simulation studies indicate that in low ambient temperature of −10 °C, utilizing waste heat from fuel cells as the heat source for the heat pump air conditioning system to warm the battery reduced heating time by 50 % compared to direct heating methods. The heating time for the cabin was reduced by 70 %. In terms of thermal management energy consumption, the ADRC algorithm for optimizing energy consumption decreased thermal management energy consumption by 43.6 % compared to ADRC. When operating in waste heat recovery mode, the heating energy consumption ratio of the heat pump air conditioning system was 4, resulting in a 75 % reduction in energy consumption. The comprehensive improvement has enhanced the energy efficiency of the fuel cell power system and the entire vehicle, and improved the dynamic responsiveness and environmental adaptability of the thermal management system under low ambient temperature.

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引用次数: 0

Performance and economic analysis of solar-heat pump system for process steam supply in industrial sector

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2025-02-12 DOI: 10.1016/j.enconman.2025.119596

Ga-ram Lee , Byung-Ju Lim , Sung-Hoon Cho , Muhammad Farooq , Hiroshi Tanaka , Chang-Dae Park

Various industries heavily rely on heat derived primarily from fossil fuels, significantly contributing to global carbon dioxide emissions and exacerbating the climate crisis. Transitioning to renewable energy sources is imperative to address this issue, particularly in the industrial sector. High-temperature heat pumps are efficient at supplying process steam but often lack evaporation heat sources. Solar thermal systems provide an environmentally friendly alternative, but their integration for industrial steam supply remains largely underexplored. This study proposes that a solar-heat pump system, with a novel system configuration developed for the first time in this study, offers a viable and sustainable solution for process steam supply. To evaluate its performance and economic viability, a system capable of producing 1 t/h of steam was designed, and its annual performance was assessed through simulations using Simulink, considering different storage tank volumes and solar collector areas. The economic analysis was conducted based on the performance data. The results demonstrate that the proposed system can effectively replace conventional industrial steam boilers, with an optimal design point of a solar collector area of 1,500 m² and a storage tank volume of 200 m³, achieving a payback period of 3.17 years. This study affirms that solar-heat pump systems can make a substantial contribution to decarbonization in the industrial sector.

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引用次数: 0