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Peak-Shaving of the Oxy-Fuel power plant Coupled with Liquid O_(2)Storage

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热科学学报:英文版 2023年第5期32卷 1722-1736页

作者： FU Xuchen WU Jianwen SUN Zhenkun DUAN Yuanqiang GAO Zhengping DUAN Lunbo Key Laboratory of Energy Thermal Conversion and Control Ministry of EducationSchool of Energy and EnvironmentSoutheast UniversityNanjing 210096China Inner Mongolia power Research Institute Branch Inner Mongolia Power(Group)Co.Ltd.Huhhot 010020China

Integrating a high proportion of intermittent renewable energy provides a solution for the higher peak-shaving capacity of coal-fired power ***-fuel combustion is one of the most promising carbon reduction technologies for coal-fired power *** study has proposed a novel oxy-fuel power plant that is coupled with both liquid O_(2)storage and cold energy recovery systems in order to adapt to the peak-shaving *** liquid O_(2)storage system uses cheap valley electricity to produce liquid O_(2)for a later use in the peak period to enhance the peak-shaving ***,the cold energy recovery system has been introduced to recover the physical latent energy during the phase change of liquid O_(2)to increase the power generation in the peak *** economies of three power plants,i.e.a 330 MW(e)oxy-fuel power plant as reference(Case 1),the same power plant coupled with only liquid O_(2)storage system(Case 2),and the same power plant coupled with both liquid O_(2)storage and cold energy recovery systems(Case 3),have been analyzed and *** performance analysis indicates that the peaking capacity of Case 3 can reach the range of 106.03 to 294.22 MW(e),and the maximum peak-shaving coefficient can be as high as *** analysis demonstrates that the gross exergy efficiency of Cases 2 and 3 reaches 32.18%and 33.57%,respectively,in the peak period,which are significantly higher than that of 26.70%in Case *** analysis shows that through selling the liquid O_(2)and liquid CO_(2),combined with carbon trading,the levelized cost of electricity(LCOE)of the three cases have been greatly reduced,with the lowest one of 30.90 USD/MWh shown in Case *** a comprehensive consideration,Case 3 can be considered a future reference of oxy-fuel power plant with the best thermodynamic and economic performance.

关键词： oxy-fuel peak-shaving liquid O_(2)storage cold energy recovery

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Apically guiding electron/mass transfer reaction induced by Ag/FeN_(x)Mott-Schottky effect within a hollow star reactor toward high performance zinc-air batteries

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Journal of Energy Chemistry 2024年第8期95卷 106-116,I0004页

作者： Kaixiang Shi Kaixin Wang Tong Li Junhao Li Jie Ren Xu Li Yonggang Min Zhouguang Lu Wei Tan Quanbing Liu Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center(Rongjiang Laboratory) Guangdong University of TechnologyJieyang 515200GuangdongChina Guangzhou Key Laboratory of Clean Transportation Energy Chemistry Guangdong Provincial Key Laboratory of Plant Resources BiorefinerySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006GuangdongChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158HainanChina School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

The disparity in the transfer of carriers(electrons/mass)during the reaction in zinc-air batteries(ZABs)results in sluggish kinetics of the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),along with elevated overpotentials,thereby imposing additional constraints on its ***,the pre-design and target-development of inexpensive,high-performance,and long-term stable bifunctional catalysts are urgently *** this work,an apically guiding dual-functional electrocatalyst(Ag-FeN_(x)-N-C)was prepared,in which a hierarchical porous nitrogen-doped carbon with three-dimensional(3D)hollow star-shaped structure is used as a substrate and high-conductivity Ag nanoparticles are coupled with iron nitride(FeN_(x))*** calculations indicate that the Mott-Schottky heterojunction as an inherent electric field comes from the two-phase bound of Ag and FeN_(x),of which electron accumulation in the FeN_(x)phase region and electron depletion in the Ag phase region promote orientated-guiding charge *** effective modulation of local electronic structures felicitously reforms the d-band electron-group distribution,and intellectually tunes the masstransfer reaction energy barriers for both ORR/***,the hollow star-s haped hierarchical porous structure provides an apical region for fast mass *** results show that the halfwave potential for ORR is 0.914 V,and the overpotential for OER is only 327 mV at 10 mA cm^(-2).A rechargeable ZAB with Ag-FeN_(x)-N-C as the air cathode demonstrates long-term cycling performance exceeding 1500 cycles(500 h),with a power density of 180 mW cm^(-2).Moreover,when employing AgFeN_(x)-N-C as the air cathode,flexible ZABs demonstrate a notable open-circuit voltage of 1.42 V and achieve a maximum power density of 65.6 mW cm^(-2).Ag-FeN_(x)-N-C shows guiding electron/mass transfer route and apical reaction microenvironment for the electrocatalyst architecture in the explo

关键词： Hollow star structure Mott-Schottky effect Apically guiding effect Bifunctional catalysis Zinc-air batteries

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Comprehensive summary of solid oxide fuel cell control:a state-of-the-art review

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Protection and Control of Modern power Systems 2022年第1期7卷 523-553页

作者： Bo Yang Yulin Li Jiale Li Hongchun Shu Xinyu Zhao Yaxing Ren Qiang Li Faculty of Electric power Engineering Kunming University of Science and TechnologyKunming 650500China School of Management and Economics Kunming University of Science and TechnologyKunming 650500China Warwick Manufacturing group University of WarwickCoventry CV47ALUK China Southern power Grid EHV Transmission Company DaliChina.

Hydrogen energy is a promising renewable resource for the sustainable development of *** a key member of the fuel cell(fc)family,the solid oxide fuel cell(SOfc)has attracted a lot of attention because of characteristics such as having various sources as fuel and high energy conversion efficiency,and being *** is a highly coupled,nonlinear,and multivariable complex system,and thus it is very important to design an appropriate control strategy for an SOfc system to ensure its safe,reliable,and efficient *** paper undertakes a comprehen-sive review and detailed summary of the state-of-the-art control approaches of *** approaches are divided into eight categories of control:proportional integral differential(PID),adaptive(APC),robust,model predictive(MPC),fuzzy logic(FLC),fault-tolerant(FTC),intelligent and *** SOfc control approaches are carefully evalu-ated in terms of objective,design,application/scenario,robustness,complexity,and ***,five perspectives are proposed for future research directions.

关键词： Solid oxide fuel cell Control Hydrogen energy Artificial intelligence

Cytotoxic, kinetics of inhibition of carbohydrate-hydrolysing enzymes and oxidative stress mitigation by flavonoids roots extract of Dicoma anomala(Sond.)

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Asian Pacific Journal of Tropical Medicine 2018年第1期11卷 24-31页

作者： Fatai Oladunni Balogun Anofi Omotayo Tom Ashafa Phytomedicine and Phytopharmacology Research group Department of Plant Sciences University of the Free StateQwaQwa Campus Phytomedicine and Phytopharmacology Research group Department of Plant Sciences University of the Free State QwaQwa Campus

Objective: To investigate the free radical scavenging, antidiabetic, kinetics and cytotoxic potentials of flavonoids extract of Dicoma anomala root by using standard methods. Methods:Antioxidant activity of the flavonoids was investigated at scavenging free radicals such as 1,1-diphenyl-2-picrylhydrazyl, nitric oxide, hydroxyl radical, reducing capabilities, 2,2-azinobis(3-ethylbenzothiazoline-6) sulfonic acid as well as metal chelating capability at different concentrations(0.125-1.000 mg/mL) while the antidiabetic activity was evaluated via the inhibition and kinetics of carbohydrate digestive enzymes including, alpha glucosidase, sucrase and maltase. Brine shrimp lethality assay was also employed to examine the cytotoxic effects of the extract by using different range of concentrations(0.125-2.000 mg/mL). Results: The study revealed the best antioxidant activity of the extract in 1,1-diphenyl-2-picrylhydrazyl,2,2-azino-bis(3-ethylbenzothiazoline-6) sulfonic acid and nitric oxide having IC_(50) values of(386.90±4.91),(736.00±38.12),(629.30±9.62) μg/mL respectively compared with quercetin(standard) with IC_(50) [(522.20±12.38),(1 021.00±15.61) and(1 075.00±29.35) μg/mL]respective values while it was insignificantly(P>0.05) at par with quercetin for reducing power. Similarly, the extract exhibited a moderate inhibition of alpha glucosidase(43.1%),sucrase(33.4%) and maltase(29.9%) activities which were significantly(P<0.05) better than acarbose(18.4%, 12.7% and 24.9% respectively) although acarbose(46.1%) inhibited the higher activity of alpha amylase than the extract(13.7%). The kinetics of mode of inhibition of alpha amylase, alpha glucosidase, sucrase and maltase by flavonoids extract of Dicoma anomala revealed an uncompetitive, non-competitive, competitive and non-competitive inhibition respectively. The result of the lethality assay showed a potent cytotoxic effect of the flavonoids with LC_(50) value 0.510 mg/mL. Conclusions: The results obtained from this stud

关键词： Antioxidative Antihyperglycaemic Cytotoxic Dicoma anomala Flavonoids Kinetics

Application of Submerged Ultrafiltration in Pretreatment of Flue Gas Desulfurization Wastewater

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Energy Engineering 2022年第6期119卷 2277-2296页

作者： Jiageng Zhang Zhengfeng Wang Jiguang Huang Chao Cheng Heng Zhang Dan Gao School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Hebei Construction&Investment group Xuanhua Thermal power Co. Ltd.Zhangjiakou075100China

Nowadays,the zero liquid discharge of flue gas desulfurization(FGD)wastewater from coal-fired units has attracted the attention of all countries in the *** pretreatment methods generally have the problems of high operation cost,small treatment capacity,and poor ***,the membrane method can avoid the above *** the current research,it has not been found that someone directly uses submerged ultrafiltration to pretreat FGD ***,this paper innovatively proposed to directly use ceramic ultrafiltration membrane to treat FGD wastewater,which can ensure effluent quality and improve the flexibility of the pretreatment *** this paper,the performance of submerged ultrafiltration membrane for the filtration of FGD wastewater from a power plant was studied to optimize the filtration performance and improve the effluent *** effects of operating parameters such as membrane permeate flux,aeration rate and filtration/backwashing time combination on the membrane performance were *** results showed that when the filtration/backwashing time combination was 15 min/30 s,with the increased in permeate flux from 55 L/(m2·h)to 100 L/(m2·h),the steady transmembrane pressure(TMP)increased from 39 kPa to 70 kPa,and the fouling rate increased significantly from 4.5 kPa/h to 7.3 kPa/h;When the aeration rate increased from 10 m3/(m2·h)to 30 m3/(m2·h),the membrane pollution was much *** aeration rate cannot further alleviate the membrane pollution,but also brought greater energy consumption;Increasing backwashing time can effectively inhibit the formation of gel layer on the surface of the membrane and prolong the initial stage of low-pressure operation;The rejection of suspended solids(SS)and turbidity of the equipment studied in this paper can reach more than 99%under various working conditions,which can satisfy the water quality requirements of the subsequent *** submerged ultrafiltration membrane was suitable

关键词： FGD wastewater pretreatment submerged ultrafiltration permeate flux aeration rate backwashing membrane fouling

Medicinal properties of Ocotea bullata stem bark extracts:phytochemical constituents,antioxidant and anti-inflammatory activity,cytotoxicity and inhibition of carbohydrate-metabolizing enzymes

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Journal of Integrative Medicine 2018年第2期16卷 132-140页

作者： Akintayo Lanre Ogundajo Lateef Apollo Adeniran Anofi Omotayo Ashafa Phytomedicine and Phytopharmacology Research group Department of Plant SciencesUniversity of the Free StateQwaqwa CampusPhuthaditjhaba 9866South Africa

Objective： This study evaluates the phytochemical constituents, antioxidant and anti-inflammatory activity, cytotoxicity, and inhibitory activity against carbohydrate metabolism of extracts from Ocotea bullata stem bark. Methods： Hexane, ethyl acetate, methanol and water were used to extract the air-dried sample. The phytochemical investigation and antioxidant assays were carried out on the extracts using standard procedures. The antidiabetic and anti-inflammatory potentials were evaluated using α-amylase, α-glucosidase and 5-1ipoxygenase enzymes respectively. Vero cells were employed to determine the cytotoxicity of the extracts. Results： The ethyl acetate extract showed higher phenolic contents （8.97 mg/g gallic acid） while metha- nol displayed higher flavonoid （36.06 mg/g quercetin） and flavonol （153.44 mg/g rutin） contents than other extracts. Hexane extract had the greatest capacity to scavenge 1,1-diphenyl-2-picryl-hydrazyl （0.19mg/mL）, hydroxyl （25.77mg/mL） and 2,2-azino-bisC3-ethylbenzothiazoline）-6-sulfonic acid （0.07 mg/mL） radicals, while ethyl acetate extract exhibited stronger inhibition （P 〈 0.05） against superoxide anion （0.41 mg/mL） and ferric ion-reducing power （2.36 mg/mL） compared to other extracts and standards. Aqueous extract （27.02 mg/mL） exhibited strong metal-chelating activity （P 〈 0.05） compared to other extracts and gallic acid. The aqueous extract demonstrated the greatest inhibition of α-glucosidase （1.45 mg/mL） and α-amylase （2.43 mg/mL） compared to other extracts and acarbose. There were no significant differences （P 〈 0.05） in half-maximum inhibitory concentration （ICso） values of all tested extracts and indomethacin in the inhibition of 5-lipoxygenase activity. The aqueous extract was nontoxic to Vero cells with an IC50 value of 0.38 mg/mL. Conclusion： O. bullata stem bark contains active phytochemicals with diverse pharmacological potentials that could be beneficial in managing diabetes and inflammation.

关键词： Ocotea bullata Antioxidants Antidiabetics Anti-inflammatories Cytotoxicity

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Impact of different kinds of biomass mixtures on combustion performance, interaction and synergistic effects in cofiring of coal and biomass in steam power plants

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Clean Energy 2023年第5期7卷 1136-1147页

作者： Mochamad Soleh Azaria Haykal Ahmad Firman Bagja Juangsa Prihadi Setyo Darmanto Ari Darmawan Pasek Mechanical Engineering Doctoral Program Study Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Mechanical Engineering Master Program Study Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Energy Conversion Research group Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Research and development Center PT.PLN Indonesia power

The cofiring of biomass and coal may be one of the most effective methods to improve energy utilization efficiency and reduce greenhouse gas *** study aims to investigate combustion performance,interaction and synergistic effects in the cofiring of coal and three types of *** fuel consisting of coal and three types of biomass such as sawdust,rice husk and solid recovery fuel was selected as the research *** and proximate analysis and differential thermogravimetric analysis with heating rates of between 10°C and 40°C/minute are used to analyse combustion *** of combustion in a 600-MWe steam power plant with a Carolina-type boiler is also carried out with the help of computational fluid dynamic(CFD)analysis to see the effect of the interaction and synergy of the mixed fuel on the performance of the steam *** effect on the com-bustion process in the combustion chamber of a steam power plant is also *** on the analysis of several test results of parameters such as ignition temperature,burnout temperature,calorific value of the fuel mixtures as well as CFD simulation,the results of the study show a strong indication of a positive synergy in mixing some of these biomasses as compared with a fuel mix-ture consisting only of coal and one type of *** no power derating of the boiler occurs until the biomass content in the fuel mixture is~30%on a mass *** reduction in greenhouse gas emissions also appears significant from the results of the CFD simulation of this study,which is characterized by a decrease in the fraction of CO_(2) in flue gas from 21.5%for coal alone as fuel to 15.9%in the case of cofiring excluding the CO_(2) attributed to the biomass.

关键词： biomass sawdust cofiring coal-fired power plant combustion decarbonization computational fluids dynamic

Two decades of suspect evidence for adaptive molecular evolution——negative selection confounding positive-selection signals

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National Science Review 2022年第5期9卷 129-141页

作者： Qipian Chen Hao Yang Xiao Feng Qingjian Chen Suhua Shi Chung-Ⅰ Wu Ziwen He State Key Laboratory of Biocontrol Guangdong Key Laboratory of Plant Resources School of Life SciencesSouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Sun Yat-sen University

There has been a large literature in the last two decades affirming adaptive DNA sequence evolution between *** main lines of evidence are from(i) the McDonald-Kreitman(MK) test,which compares divergence and polymorphism data,and(ii) the phylogenetic analysis by maximum likelihood(PAML) test,which analyzes multispecies divergence ***,we apply these two tests concurrently to genomic data of Drosophila and *** our surprise,the> 100 genes identified by the two tests do not overlap beyond random *** the non-concordance could be due to low powers leading to high false negatives,we merge every 20-30 genes into a 'supergene'.At the supergene level,the power of detection is large but the calls still do not *** rule out methodological reasons for the *** particular,extensive simulations fail to find scenarios whereby positive selection can only be detected by either MK or PAML,but not *** molecular evolution is governed by positive and negative selection concurrently,a fundamental assumption for estimating one of these(say,positive selection) is that the other is ***,in a broad survey of primates,birds,Drosophila and Arabidopsis,we found that negative selection rarely stays constant for long in *** a consequence,the variation in negative selection is often misconstrued as a signal of positive *** conclusion,MK,PAML and any method that examines genomic sequence evolution has to explicitly address the variation in negative selection before estimating positive *** a companion study,we propose a possible path forward in two stages—first,by mapping out the changes in negative selection and then using this map to estimate positive *** now,the large literature on positive selection between species has to await reassessment.

关键词： molecular evolution neutral theory natural selection

Reciprocating Engine Step Load Response in Islanded power Generation

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Energy and power Engineering 2013年第4期5卷 337-343页

作者： Yun Tian Rudie Crous power group WorleyParsons Ltd. Perth Australia

The step load response of reciprocating engines is one of the key characteristics when considering its application in medium to large scale stationary power generation especially with islanded generation. This paper discusses the impacts of power frequency deviation on the generators and electrical equipment in the network and presents the relationship between step load capabilities and generator operating parameters. For a power plant consisting of a number of generators both step load and power output requirements must be satisfied. An analysis method is proposed to facilitate the development of an operation strategy which can meet both step load and power demand requirements in the full load range.? Typical reciprocating engine step load curves are used to demonstrate the analysis method and the results are further optimised for lower operational cost. This analysis method provides a general approach to operation strategy of large reciprocating engines used in islanded power generation.

关键词： Step Load Islanded power Generation Reciprocating Engine power Frequency Control