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A numerical study of non-Darcy flow in EGS heat reservoirs during heat extraction

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Frontiers in Energy 2019年第3期13卷 439-449页

作者： Wenjiong CAO Wenbo HUANG Guoling WEI Yunlong JIN Fangming JIANG Laboratory of Advanced Energy Systems Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentCAS Key Laboratory of Renewable EnergyGuangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangdong Hydrogeology Battalion Guangzhou 510510China

Underground non-Darcy fluid flow has been observed and investigated for decades in the petroleum industry. It is deduced by analogy that the fluid flow in enhanced geothermal system (EGS) heat reservoirs may also be in the non-Darcy regime under some conditions. In this paper, a transient 3D model was presented, taking into consideration the non-Darcy fluid flow in EGS heat reservoirs, to simulate the EGS long-term heat extraction process. Then, the non-Darcy flow behavior in water- and supercritical CO2 (SCCO2)-based EGSs was simulated and discussed. It is found that non-Darcy effects decrease the mass flow rate of the fluid injected and reduce the heat extraction rate of EGS as a flow resistance in addition to the Darcy resistance which is imposed to the seepage flow in EGS heat reservoirs. Compared with the water-EGS, the SCCO2-EGS are more prone to experiencing much stronger non-Darcy flow due to the much larger mobility of the SCCO2. The non-Darcy flow in SCCO2- EGSs may thus greatly reduce their heat extraction performance. Further, a criterion was analyzed and proposed to judge the onset of the non-Darcy flow in EGS heat reservoirs. The fluid flow rate and the initial thermal state of the reservoir were taken and the characteristic Forchheimer number of an EGS was calculated. If the calculated Forchheimer number is larger than 0.2, the fluid flow in EGS heat reservoirs experiences non-negligible non-Darcy flow characteristic.

关键词： enhanced geothermal system non-Darcy flow heat extraction Reynolds number Forchheimer number

A pH-sensitive Modified Polyacrylamide Hydrogel

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Chinese Chemical Letters 2006年第3期17卷 399-402页

作者： Ping An SONG Ya Feng ZHANG Jian Zheng KUANG guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 Guangdong Research and development Center of Chemical Grouting Engineering Technology Guangzhou 510650

A pH-sensitive modified polyacrylamide hydrogel was prepared by two steps and the modified polyacrylamide was characterized by ^1HNMR spectrum. The surface morphology and swelling behavior of the hydrogels were invest... 详细信息

关键词： Polyacrylamide hydrogel pH-sensitive.

Towards Efficient Blue DelayedFluorescence Molecules by Modulating Torsion Angle Between Electron Donor and Acceptor

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CCS Chemistry 2023年第3期5卷 598-606页

作者： Jinke Chen Xing Wu Hao Liu Nuoling Qiu Zhangshan Liu Dezhi Yang Dongge Ma Ben Zhong Tang Zujin Zhao State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSouth China University of TechnologyGuangzhou 510640 School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenGuangdong 518172 AIE Institute Guangzhou Development DistrictHuangpuGuangzhou 510530

Constructing blue thermally activated delayedfluorescence materials for high-performance organic light-emitting diodes(OLEDs)remains challenging due to the intrinsically strong intramolecular charge transfer nature of the nearly orthogonal connection of electron donor(D)and acceptor(A),which results in long-wavelength ***,an effective delayed-fluorescence design strategy of modulating D–A torsion angles is proposed and efficient sky-blue,pure-blue,and deep-blue delayed-fluorescence molecules consisting of a xanthenone acceptor and carbazole-based donors are created by decreasing the torsion *** exhibit strong delayed fluorescence with high photoluminescence quantum yields of 85–94%in doped films,and their delayed-fluorescence lifetimes are elongated from 1.0 to 27.6μs as the torsion angles *** molecules can function as excellent emitters in OLEDs,providing efficient electroluminescence peaking at 442 nm(CIEx,y=0.15,0.08),462 nm(CIEx,y=0.15,0.18),and 482 nm(CIEx,y=0.17,0.30)with state-of-the-art external quantum efficiencies of up to 22.2%,33.7%,and 32.1%,respectively,demonstrating the proposed molecular design for efficient blue delayed-fluorescence molecules is successful and promising.

关键词： blue luminescent material thermally activated delayed fluorescence torsion angle electroluminescence organic light-emitting diode

Simultaneous Feammox and anammox process facilitated by activated carbon as an electron shuttle for autotrophic biological nitrogen removal

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Frontiers of Environmental Science & Engineering 2022年第7期16卷 87-99页

作者： Yingbin Hu Ning Li Jin Jiang Yanbin Xu Xiaonan Luo Jie Cao Key Laboratory for City Cluster Environmental Safety and Green development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou510006China Southern Marine Science and Engineering Guangdong Laboratory(guangzhou) Guangzhou511458China School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou510006China

Ferric iron reduction coupled with anaerobic ammonium oxidation(Feammox)is a novel ferric-dependent autotrophic process for biological nitrogen removal(BNR)that has attracted increasing attention due to its low organic carbon ***,extracellular electron transfer limits the nitrogen transformation *** this study,activated carbon(AC)was used as an electron shuttle and added into an integrated autotrophic BNR system consisting of Feammox and anammox *** nitrogen removal performance,nitrogen transformation pathways and microbial communities were investigated during 194 days of *** the stable operational period(days 126–194),the total nitrogen(TN)removal efficiency reached 82.9%±6.8%with a nitrogen removal rate of 0.46±0.04 kg-TN/m^(3)/*** contributions of the Feammox,anammox and heterotrophic denitrification pathways to TN loss accounted for 7.5%,89.5%and 3.0%,*** experiments showed that AC was more effective in accelerating the Feammox rate than the anammox rate.X-ray photoelectron spectroscopy(XPS)analyses showed the presence of ferric iron(Fe(III))and ferrous iron(Fe(II))in secondary minerals.X-ray diffraction(XRD)patterns indicated that secondary iron species were formed on the surface of iron-AC carrier(Fe/AC),and Fe(III)was primarily reduced by ammonium in the Feammox *** phyla Anaerolineaceae(0.542%)and Candidatus Magasanikbacteria(0.147%)might contribute to the Feammox process,and Candidatus Jettenia(2.10%)and Candidatus Brocadia(1.18%)were the dominative anammox phyla in the ***,the addition of AC provided an effective way to enhance the autotrophic BNR process by integrating Feammox and anammox.

关键词： Feammox Anammox Extracellular electron transfer Electron shuttle Activated carbon

Different oxidation routes for lattice oxygen recovery of double-perovskite type oxides LaSrFeCoO6 as oxygen carriers for chemical looping steam methane reforming

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Journal of Energy Chemistry 2017年第3期26卷 501-509页

作者： Kun Zhao Yang Shen Zhen Huang Fang He Guoqiang Wei Anqing Zheng Haibin Li Zengli Zhao Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina Guangdong Key Laboratory of New and Renewable Energy Research and development Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina University of Chinese Academy of Sciences Beijing 100049China

Double-perovskite type oxide LaSrFeCoO（LSFCO） was used as oxygen carrier for chemical looping steam methane reforming（CL-SMR） due to its unique structure and reactivity. Two different oxidation routes,steam-oxidation and steam-air-stepwise-oxidation, were applied to investigate the recovery behaviors of the lattice oxygen in the oxygen carrier. The characterizations of the oxide were determined by X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, hydrogen temperature-programmed reduction（H-TPR） and scanning electron microscopy（SEM）. The fresh sample LSFCO exhibits a monocrystalline perovskite structure with cubic symmetry and high crystallinity, except for a little impurity phase due to the antisite defect of Fe/Co disorder. The deconvolution distribution of XPS patterns indicated that Co,and Fe are predominantly in an oxidized state(Feand Fe) and(Coand Co), while O 1s exists at three species of lattice oxygen, chemisorbed oxygen and physical adsorbed oxygen. The double perovskite structure and chemical composition recover to the original state after the steam and air oxidation, while the Co ion cannot incorporate into the double perovskite structure and thus form the CoO just via individual steam oxidation. In comparison to the two different oxidation routes, the sample obtained by steam-oxidation exhibits even higher CHconversion, CO and Hselectivity and stronger hydrogen generation capacity.

关键词： Double-perovskite Chemical looping Lattice oxygen Oxidizing agent Redox

Hydrogenolysis of organosolv hydrolyzed lignin over high-dispersion Ni/Al-SBA-15 catalysts for phenolic monomers

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Chinese Journal of Chemical Engineering 2021年第4期34卷 307-314页

作者： Ying Xu Pengru Chen Wei Lv Chenguang Wang Longlong Ma Qi Zhang guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China Key Laboratory of Renewable Energy Chinese Academy of SciencesGuangzhou 510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and development Guangzhou 510640China Jiangsu Key Laboratory for Biomass Energy and Material Nanjing 210042China

Efficiency and recycling of catalysts are important for the lignin hydrogenolysis to obtain phenolic *** this work,a series of highdispersion Ni/AlSBA15 catalysts were prepared by a direct and effective preparation method,and then used in the hydrogenolysis of diphenyl ether(DE)and organosolv hydrolyzed lignin(OHL)for phenolic *** universality of asmade catalysts in different solvents and cyclic performance were *** showed that the addition of ethylene glycol(EG)during the loading process of Ni promoted the dispersion of metal *** dispersion of Ni species could highly enhance the conversion of DE and the OHL which Ni/AlSBA15(1EG)exhibited the excellent catalytic *** was found to be most effective solvent on the conversion of DE(99.16%).84.77%liquefaction ratio and 21.36%monomer yield were achieved,and no obvious char was observed after the depolymerization of OHL in ethanol solvent at 280℃for 4 h over the Ni/AlSBA15(1EG)catalyst.

关键词： Lignin Hydrogenolysis depolymerization High-dispersion Ni-based catalyst Al-SBA-15

Morphology and Cure Behavior of Multi-walled Carbon Nanotubes-based Thermally Conductive Adhesive

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Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 451-454页

作者：王军霞晏石林 HE Yunban YAN Fei XIE Beiping School of Science Wuhan University of Technology guangzhou Yueneng Power Technology development Co.Ltd

We evaluated the cure behavior of multi-walled carbon nanotubes （MWCNTs） based thermally conductive adhesive by comprehensively thermal analysis, which presented extremely complicated variability of conversion ratio a as a function of temperature with synergistic action of positive effect and negative volumeblocking effect of MWCNTs and cross-linked network of cured polymer molecules. Due to the decomposition of MWCNTs and degradation of polymer, the mass drop is dramatically obvious over the temperature range of 330-370 ℃. Binary resins filled with acid -treated MWCNTs present similar reaction interval as neat epoxy and matrix resins, which is distinct from the material filled with raw MWCNTs. The alteration of the crystalline temperature and cure temperature of resins is attributed to heterogeneous nucleation of MWCNTs in matrix resins. The --COOH group of acid-treated MWCNTs reacts with epoxy groups and thus generates cross-linking, accelerates the reaction rate and reduces the cure temperature.

关键词： adhesive carbon nanotubcs thermal analysis degradation

Nutritional Composition and Assessment of Gracilaria lemaneiformis Bory

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Journal of Integrative Plant Biology 2006年第9期48卷 1047-1053页

作者： Xue Wen Changlian Peng Houcheng Zhou Zhifang Lin Guizhu Lin Shaowei Chen Ping Li College of Life Sciences South China Normal University Guangzhou 510631 China South China Institute of Botany the Chinese Academy of Sciences Guangzhou 510650 China Center for Marine Resource Research and development in Guangdong Guangzhou 510070 China

The chemical composition, mineral elements, vitamins, free fatty acids and amino acid content of the edible red alga Gracilaria lemaneiformis Bory, grown in the sea near Nan＇ao island, Guangdong Province, were analyzed in the present study. Gracilaria lemaneiformis Bory showed a total sugar content of 14.65%. The protein content was 21%, of which approximately 41% was determined to be essential amino acids （EAA）. The major amino acid components were glutamic acid, leucine, arginine, and alanine. Of the EAA assayed, methionine and cysteine appeared to be the most limiting amino acids compared with the EAA pattern provided by Food and Agricultural Organization of the United Nations. The total lipids content was 0.87% and comprised a high composition of unsaturated fatty acids （61%）, mainly as linoleic acid and oleic acid, and a little amount of polyunsaturated fatty acid; palmitic acid was the main component （39%） of saturated acids. Relatively high levels of vitamin C, iodine, phosphorus, and zinc were also present in G. lemaneiformis. The nutritional composition between G. lemaneiformis and Nostoc flagelliforme, a rare alga that is widely eaten in Chinese society, was compared. The results suggest that N. flagelliforme can be substituted for by G. lemaneiformis, not only because of their similar shape, but also because of their approximate nutritional composition. Gracilaria lemaneiformis may possibly serve as a potential healthy food in human diets in the future.

关键词： amino acids fatty acids Gracilaria lemaneiformis mineral elements protein vitamins

Factors controlling the enrichment of natural gas in Kuche depression,Tarim Basin,NW China:Molecular geochemical evidence from sedimentary organic matter

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Chinese Science Bulletin 2004年第S1期49卷 66-71页

作者： SUN Yongge XIAO Zhongyao LIU Dehan CHAI Pingxia XU Shiping SKLOG guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China Tarim Petroleum Exploration and development Company PetroChinaKuerle 841000China

Using molecular geochemical data from infrared spectrometer and pyrolysis gas chromatography-mass spectrometry, this paper investigates the petroleum generation characteristics of Jurassic coal measures from Kuche depression, Tarim Basin, NW China. The results showed that the Jurassic coaly rocks with medium maturity (R0%: 0.8-1.1) were enriched in gas-prone functionalities (-CH3) and low molecular weight pyrolysates (

关键词： natural gas Jurassic coal measures Kuche depression infrared spectrometer pyrolysis gas chromatography-mass spec-trometry.