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techno-economic assessment of a chemical looping splitting system for H2 and CO Co-generation

Green Energy & Environment 2023年第1期8卷 338-350页

作者： Hao Peng Zichen Di Pan Gong Fengling Yang Fangqin Cheng Institute of Resources and Environmental Engineering Shanxi Laboratory for Yellow RiverShanxi UniversityTaiyuan030006China

The natural gas(NG)reforming is currently one of the low-cost methods for hydrogen ***,the mixture of H2 and CO_(2) in the produced gas inevitably includes CO_(2) and necessitates the costly CO_(2) *** this work,a novel double chemical looping involving both combustion(CLC)and sorption-enhanced reforming(SE-CLR)was proposed towards the co-production of H2 and CO(CLC-SECLRHC)in two separated *** provides reactant CO_(2) and energy to feed SECLRHC,which generates hydrogen in a higher purity,as well as the calcium cycle to generate CO in a higher ***-economic assessment of the proposed system was conducted to evaluate its efficiency and economic *** revealed that the optimal molar ratios of oxygen carrier(OC)/NG and steam/NG for reforming were recommended to be 1.7 and 1.0,*** heat integration within CLC and SECLRHC units can be achieved by circulating hot *** desired temperatures of fuel reactor(FR)and reforming reactor(RR)should be 850C and 600C,*** heat coupling between CLC and SECLRHC units can be realized via a jacket-type reactor,and the NG split ratio for reforming and combustion was 0.53:*** the optimal conditions,the H2 purity,the H2 yield and the CH4 conversion efficiency were 98.76%,2.31 mol mol-1 and 97.96%,*** carbon and hydrogen utilization efficiency respectively were 58.60% and 72.45%in terms of the total hydrogen in both steam and *** exergy efficiency of the overall process reached 70.28%.In terms of the conventional plant capacity(75 × 103 t y^(-1))and current raw materials price(2500$t^(-1)),the payback period can be 6.2 years and the IRR would be 11.5,demonstrating an economically feasible and risk resistant capability.

关键词： Natural gas reforming Chemical looping Heat integration coupling techno-economic assessment Hydrogen

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Comprehensive Optimization-based techno-economic assessment of Hybrid Renewable Electricity-hydrogen Virtual Power Plants

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 553-566页

作者： James Naughton Shariq Riaz Michael Cantoni Xiao-Ping Zhang Pierluigi Mancarella University of Melbourne(UoM) Australia University of Birmingham(UoB) UK University of Manchester UK

Hydrogen is being considered as an important option to contribute to energy system ***,currently its production from renewables is expensive compared with the methods that utilize fossil *** paper proposes a comprehensive optimization-based techno-economic assessment of a hybrid renewable electricity-hydrogen virtual power plant(VPP)that boosts its business case by co-optimizing across multiple markets and contractual services to maximize its profits and eventually deliver hydrogen at a lower net ***,multiple possible investment options are *** studies of VPP placement in a renewable-rich,congested area of the Australian network and based on real market data and relevant sensitivities show that multi-market participation can significantly boost the business case for cleaner *** highlights the importance of value stacking for driving down the cost of cleaner *** to the participation in multiple markets,all VPP configurations considered are found to be economically viable for a hydrogen price of 3 AUD$/kg(2.25 USD$/kg),which has been identified as a threshold value for Australia to export hydrogen at a competitive ***,if the high price volatility that has been seen in gas prices in 2022(and by extension electricity prices)continues,the flexibility of hybrid VPPs will further improve their business cases.

关键词： Virtual power plant techno-economic assessment electrolyser flexibility hydrogen multi-energy system optimal power flow

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Application and progress of techno-economic analysis and life cycle assessment in biomanufacturing of fuels and chemicals

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Green Chemical Engineering 2023年第2期4卷 189-198页

作者： Rongzhan Fu Lixia Kang Chenyue Zhang Qiang Fei Shaanxi Key Laboratory of Degradable Biomedical Materials School of Chemical EngineeringNorthwest UniversityXi'an710069China Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an710049China

To reduce the dependency on petroleum-based products and emission of greenhouse gas,renewable biofuels and chemicals play an important role to meet the unmatched energy demands of the rapidly growing ***,most biofuel and chemical products do not reach the commercialization stage,mainly hindered by incomparable economics to ***-economic assessment(TEA)is a useful tool to estimate eco-nomic performance,and identify bottlenecks for the development of biofuel and chemical production technology,meanwhile,life cycle assessment(LCA)is applied to assess sustainability by reducing the environmental impact of biofuel and chemical *** present review covers TEA and LCA research progress in the manufacturing of biofuels and biochemical,and discusses the impacts of TEA and LCA results on the development and optimi-zation of biofuel and chemical *** addition,challenges associated with TEA and LCA of biofuel and biochemical production were briefly overviewed,and potential approaches that may overcome such challenges were discussed enabling viable and sustainable biomanufacturing of fuels and *** integrated TEA and LCA studies could significantly promote the economic and sustainable development of the biomanufacturing process.

关键词： techno-economic assessment Life cycle assessment Biomanufacturing Fuels Chemicals Bioethanol Biodiesel

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Waste bio-tar based N-doped porous carbon for supercapacitors under dual activation:performance,mechanism,and assessment

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Biochar 2023年第1期5卷 1559-1573页

作者： Jixiu Jia Yuxuan Sun Zhidan Liu Ziyun Liu Lili Huo Kang Kang Yanan Zhao Lixin Zhao Teng Xie Maojiong Cao Zonglu Yao Key Laboratory of Low-Carbon Green Agriculture in North China Ministry of Agriculture and Rural Affairs P.R.China.Institute of Environment and Sustainable Development in AgricultureCAASBeijing 100081China Laboratory of Environment-Enhancing Energy(E2E) Key Laboratory of Agricultural Engineering in Structure and EnvironmentMinistry of College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Biorefining Research Institute(BRI)and Department of Chemical Engineering Lakehead UniversityThunder BayON P7B 5E1Canada

Bio-tar extra-produced from biomass pyrolysis is prone to pose a threat to environment and human health.A novel N-doped porous electrode from bio-tar was produced under dual-activation of urea and KOH in this *** dual-activation played significant roles in N-functional group and micro-mesoporous structure,which resulted in the carbon material with the highest of nitrogen content(4.08%)and the special surface area(1298.26 m^(2)·g^(−1)).Specifically,the potential mechanisms of pore formation and N-doping in the one-pot dual-activation strategy were also proposed as a consequence,the one-pot dual-activated carbon material displayed excellent electrochemical performance with the highest capacitance of 309.5 F·g^(−1) at 0.5 A·g^(−1),and the unipolar specific capacitance remained with cyclic characteristics of 80.1%after 10,000 cycles in two-electrode symmetric ***,the one-pot dual-activation strategy could create a profit of$1.64-$2.38 per kilogram of bio-tar processed without considering the initial investment and labor costs,which provides new perspectives for the utilization of waste bio-tar.

关键词： Bio-tar Dual activation techno-economic assessment Porous carbon N-doping Supercapacitors

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Numerical simulation of underground seasonal cold energy storage for a 10 MW solar thermal power plant in north-western China using TRNSYS

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Frontiers in Energy 2021年第2期15卷 328-344页

作者： Zulkarnain ABBAS Yong LI Ruzhu WANG Institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

This paper aims to explore an efficient, cost-effective, and water-saving seasonal cold energy storage technique based on borehole heat exchangers to cool the condenser water in a 10 MW solar thermal power plant. The proposed seasonal cooling mechanism is designed for the areas under typical weather conditions to utilize the low ambient temperature during the winter season and to store cold energy. The main objective of this paper is to utilize the storage unit in the peak summer months to cool the condenser water and to replace the dry cooling system. Using the simulation platform transient system simulation program (TRNSYS), the borehole thermal energy storage (BTES) system model has been developed and the dynamic capacity of the system in the charging and discharging mode of cold energy for one-year operation is studied. The typical meteorological year (TMY) data of Dunhuang, Gansu province, in north-western China, is utilized to determine the lowest ambient temperature and operation time of the system to store cold energy. The proposed seasonal cooling system is capable of enhancing the efficiency of a solar thermal power plant up to 1.54% and 2.74% in comparison with the water-cooled condenser system and air-cooled condenser system respectively. The techno-economic assessment of the proposed technique also supports its integration with the condenser unit in the solar thermal power plant. This technique has also a great potential to save the water in desert areas.

关键词： seasonal cold energy storage borehole heat exchangers typical meteorological data TRNSYS condenser cooling techno-economic assessment

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Systematic comparison of hydrogen production from fossil fuels and biomass resources

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International Journal of Agricultural and Biological Engineering 2017年第6期10卷 192-200页

作者： Kang Peng Gary Morrow Zhang Xiaolei Wang Tipeng Tan Zhongfu Jayant Agarwal Institute of Energy economics and Environment School of Economics and ManagementNorth China Electric Power UniversityBeijing 102206China School of Mechanical and Aerospace Engineering Queen’s University BelfastBelfast BT95AHUnited Kingdom National Engineering Laboratory for Biomass Power Generation Equipment School of Renewable Energy EngineeringNorth China Electric Power UniversityBeijing 102206China Department of Mechanical Engineering College of Engineering RoorkeeUttarakhand 247667India

Fossil fuels are the main energy source to satisfy the worldwide energy ***,the energy demands are increasing and the supply of fossil fuels is decreasing,thus many countries are looking for other fuel *** from the traditional fuels,hydrogen is considered as one of the most promising energy sources due to its intrinsic features such as clean,efficient,safe and *** novel technologies for hydrogen production from renewable sources(such as biomass)becomes a core area for the investigation of hydrogen *** this work,different pathways for hydrogen production including steam reforming,electrolysis,and biomass gasification have been systematically compared in terms of yield and *** comparison is unique since the systematic evaluation was conducted from many aspects for all the hydrogen production pathways,especially those by involving the biomass gasification that still lack of available *** assessment methods involved energy analysis,exergy analysis and economic *** was concluded that steam reforming remains the cheapest method of hydrogen production at 1.748$/kg,however,steam reforming is not an ideal process currently or for the future,gasification and electrolysis remains competitive with high yield but requires relatively high initial and annual *** biomass gasification,though its energy efficiency is lower than steam reforming,it has relatively higher mass yield,demonstrating the feasibility of this process for hydrogen *** for biomass gasification,the selection of correct feedstock is a key to maximize its yield,i.e.a yield of 82.47%is possible with corn stover fed gasification.

关键词： hydrogen production biomass feedstock gasification pyrolysis fossil fuel techno-economic assessment exergy

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CO_(2)capture costs of chemical looping combustion of biomass:A comparison of natural and synthetic oxygen carrier

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Journal of Energy Chemistry 2024年第5期92卷 296-310页

作者： Benjamin Fleiß Juraj Priscak Martin Hammerschmid Josef Fuchs Stefan Müller Hermann Hofbauer Institute of Chemical Environmental and Bioscience EngineeringTU WienVienna1060 ViennaAustria BEST–Bioenergy and Sustainable technologies GmbH Graz8010 StyriaAustria

Chemical looping combustion has the potential to be an efficient and low-cost technology capable of contributing to the reduction of the atmospheric concentration of CO_(2) in order to reach the 1.5/2°C goal and mitigate climate *** this process,a metal oxide is used as oxygen carrier in a dual fluidized bed to generate clean CO_(2) via combustion of *** commonly,natural ores or synthetic materials are used as oxygen carrier whereas both must meet special requirements for the conversion of solid *** oxygen carriers are characterized by higher reactivity at the expense of higher costs versus the lower-cost natural *** determine the viability of both possibilities,a techno-economic comparison of a synthetic material based on manganese,iron,and copper to the natural ore ilmenite was *** synthetic oxygen carrier was characterized and tested in a pilot plant,where high combustion efficiencies up to 98.4%and carbon capture rates up to 98.5%were *** techno-economic assessment resulted in CO_(2) capture costs of 75 and 40€/tCO_(2) for the synthetic and natural ore route respectively,whereas a sensitivity analysis showed the high impact of production costs and attrition rates of the synthetic *** synthetic oxygen carrier could break even with the natural ore in case of lower production costs and attrition rates,which could be reached by adapting the production process and recycling *** comparison to state-of-the-art technologies,it is demonstrated that both routes are viable and the capture cost of CO_(2) could be reduced by implementing the chemical looping combustion technology.

关键词： Chemical looping combustion BECCS techno-economic assessment CO_(2)capture costs Oxygen carrier development Synthetic materials Ilmenite

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The role of heat pump in heating decarbonization for China carbon neutrality

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Carbon Neutrality 2022年第1期1卷 1-17页

作者： Hongzhi YAN Ruzhu WANG Chuan Zhang Zhenyuan Xu Bin Hu Zhao Shao Institution of Refrigeration and Cryogenics MOE Engineering Research Center of Solar EnergyShanghai Jiao Tong UniversityShanghai 200240China Institute of Energy Peking University5 Yiheyuan RoadBeijing 100871China

Heating decarbonization is a major challenge for China to meet its 2060 carbon neutral commitment,yet most existing studies on China’s carbon neutrality focus on supply side(e.g.,grid decarbonization,zero-carbon fuel)rather than demand side(e.g.,heating and cooling in buildings and industry).In terms of end use energy consumption,heating and cooling accounts for 50% of the total energy consumption,and heat pumps would be an effective driver for heating decarbonization along with the decarbonization on power generation *** study has discussed the underestimated role of the heat pump in achieving China’s goal of carbon neutrality by *** this paper,various investigation and assessments on heat pumps from research to applications are *** maximum decarbonization potential from heat pump in a carbon neutral China future could reach around 1532Mton and 670Mton for buildings and industrial heating respectively,which show nearly 2 billion tons CO_(2) emission reduction,20% current CO_(2) emission in ***,a region-specific technology roadmap for heat pump development in China is *** collaborated efforts from government incentive,technology R&D,and market regulation,heat pump could play a significant role in China’s 2060 carbon neutrality.

关键词： Carbon neutrality Heat pump Heating decarbonization techno-economic assessment technological roadmap Building heating Industrial heating

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