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Numerical simulation on optimization of structure and operating parameters of a novel lean coal decoupling burner

Chinese Journal of Chemical Engineering 2020年第11期28卷 2890-2899页

作者： Jing Wang Ruiping Zhang Fengling Yang Fangqin Cheng Institute of Resource and Environment Engineering Shanxi UniversityState Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste ResourcesTaiyuan 030006China

Due to its low volatile characteristics of lean coal,it is difficult to catch fire and burn ***,high temperature is needed to maintain combustion efficiency,while,this leads to high nitrogen oxide *** power plant boilers burning lean coal,stable combustion with lower nitrogen oxide emission is a challenging *** study applied the 3D numerical simulation on the analysis of a novel de-coupling burner for low-volatile coal and its structure and operation parameters *** indicate that although it was more difficult for lean coal decoupling burner to ignite lean coal than high volatile coal,the burner formed a stepwise ignition trend,which promoted the rapid ignition of lean *** of three central partition plate structure shows that in terms of characteristics of the flow field distribution,rich and lean separation and combustion,the structure with an inclination of 0°showed good performance,with its rich-lean air ratio being 0.85 and concentration ratio being 22.94,and there was an apparent decoupling combustion ***,the structure of the selected burner was optimized for its operational *** optimal operating parameters was determined as the primary air velocity of 24.9 m·s^-1 and the mass flow rate of pulverized coal of 2.5 kg·s^-1,in which the pyrolysis products were utilized as reductive agent more ***,the nitrogen oxide was efficiently reduced to nitrogen,which emission concentration was 61.88%lower than that in the design condition.

关键词： Numerical simulation Low-volatile coal De-coupling combustion Lean coal ignition NO_x reduction

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Liquid-liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

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Chinese Journal of Chemical Engineering 2023年第4期56卷 281-289页

作者： Ming Chen Huiyan Jiao Jun Li Zhibin Wang Feng He Yang Jin Engineering research center of comprehensive utilization and Clean Processing of Phosphorus resources School of Chemical EngineeringSichuan UniversityChengdu 610065China The Key Laboratory of Fine Chemical Application Technology of Luzhou Sichuan Vocational College of Chemical TechnologyLuzhou 646300China

In this work, flow pattern and mass transfer of liquid-liquid two-phase flow in a wire-embedded concentric microchannel are studied using toluene-water system. Droplet flow, slug flow, oval flow and annular flow are observed in the wire-embedded concentric microchannel. The effects of embedded wires and physical properties on flow patterns are investigated. The embedded wire insert is conducive to the formation of annular flow. The flow pattern distribution regions are distinguished by the Caaq(capillary number)±We_(org)(Weber number) flow pattern map. When Weorg0.1, annular flow is the main flow pattern. Oval flow and droplet flow are between We_(org)= 0.001-0.1, and oval flow is transformed into droplet flow with the increase of Caaq. The effect of flow rate, phase ratio, initial acetic acid concentration, insert shape and flow patterns on mass transfers are studied. Mass transfer process is enhanced under annular flow conditions, the volumetric mass transfer coefficient is up to 0.36 s^(-1) because of the high interfacial area and interface renewal rate of annular flow.

关键词： Flow pattern Mass transfer Microchannels Two-phase flow

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An Experimental Study on the Conductivity Changes in coal during Methane Adsorption-Desorption and their Influencing Factors

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 704-717页

作者： CHEN Yue MA Dongmin GUO Chen YANG Fu MU Tian GAO Zheng College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina Key Laboratory of coal resources Exploration and comprehensive utilization Ministry of Land and ResourcesXi'an 710021ShaanxiChina Post-doctorate R&D Base of Geological resources and Geological Engineering Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina Geological research Institute for coal Green Mining Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina

During the processes of methane adsorption and desorption,the internal structure of coal changes,accordingly leading to changes in electrical *** this paper,using low rank coal seams of the Yan'an Formation in the Dafbsi field as the research subject,the relationship between coal resistivity,methane adsorption quantity,and equilibrium pressure is analyzed through proximate analysis,mercury injection tests,low temperature liquid nitrogen adsorption tests,and coal resistivity measurements during methane adsorption and *** results show that during the process of pressure rise and methane adsorption,the conductivity of coal increases,resulting from heat release from methane adsorption,coal matrix swelling and adsorbed water molecules replaced by methane,but the resistivity reduction gradually *** relationship between coal resistivity and methane adsorption quantity and equilibrium pressure can be described by a quadratic *** the processes of depressurization and desorption,the resistivity of coal rebounds slightly,due to decalescence of methane desorption,coal matrix shrinkage and water-gas displacement,and the relationship coincides with a linear *** adsorption leads to irreversible changes in coal internal structure and enhances the coal conductivity,and resistivity can not be restored to the initial level even after methane *** resistivity and reduction rate of durain are higher than those of vitrain,with relatively greater homogeneous pore throat structure and fewer charged particles in the double electric *** addition,moisture can enhance the conductivity of coal and makes it change more complexly during methane adsorption and desorption.

关键词： coal reservoir adsorption-desorption electric resistivity lithotype moisture

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Crystallization and viscosity-temperature characteristics during co-gasification of industrial sludge and coal

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Frontiers in Energy 2022年第6期16卷 1037-1047页

作者： Linmin ZHANG Bin LIU Juntao WEI Xudong SONG Yonghui BAI Jiaofei WANG Ying ZHOU Huijun YANG Guangsuo YU State Key Laboratory of High-efficiency utilization of coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Joint International research Laboratory of Biomass Energy and Materials Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Institute of coal Chemical Industry Technology Ningxia Coal Industry Co.Ltd.Yinchuan 750000China Institute of Clean coal Technology East China University of Science and TechnologyShanghai 200237China

Co-gasification of industrial sludge(IS)and coal was an effective approach to achieve harmless and sustainable utilization of *** long-term and stable operation of a co-gasification largely depends on fluidity of coal-ash ***,the effects of IS addition on the crystallization and viscosity of Shuangmazao(SMZ)coal were investigated by means of high temperature stage coupled with an optical microscope(HTSOM),a scanning electron microscopy coupled with an energy dispersive Xray spectrometry(SEM-EDS),X-ray diffraction(XRD),a Fourier transform infrared spectrometer(FTIR),and FactSage *** results showed that when the proportion of IS was less than 60%,with the addition of IS,the slag existed in an amorphous *** was due to the high content of SiO_(2) and Al_(2)O_(3) in SMZ ash and blended ash,which had a high glass-forming ability(GFA).The slag formed at a high temperature had a higher polymerization degree and viscosity,which led to a decrease in the migration ability between ions,and ultimately made the slag difficult to crystallize during the *** the proportion of IS was higher than 60%,the addition of IS increased the CaO and FeO content in the *** network modifiers,CaO and FeO could provide O^(2−)at a high temperature,which reacted with silicate network structure and continuously destroyed the complexity of network structure,thus reducing the polymerization degree and viscosity of *** this time,the migration ability between ions was enhanced,and needle-shaped/rod-shaped crystals were precipitated during the cooling ***,the viscosity calculated by simulation and Einstein-Roscoe empirical formula demonstrated that the addition of IS could significantly improve the fluidity of coal ash and meet the requirements of the liquid slag-tapping *** purpose of this work was to provide theoretical support for slag flow mechanisms during the gasifier slagging-tapping process and the resource treatment of industrial s

关键词： co-gasification industrial sludge crystallization viscosity mineral matter evolution

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Regeneration of spent LiFePO4 as a high-performance cathode material by a simultaneous coating and doping strategy

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1162-1170页

作者： Hui Tong Yi Li Gaoqiang Mao Chaolei Wang Wanjing Yu Yong Liu Mudan Liu School of Metallurgy and Environment Central South UniversityChangsha 410083China Guangdong Provincial Key Laboratory of Development and comprehensive utilization of Mineral resources Guangzhou 510560China National&Regional Joint Engineering research center of Nonferrous Metal Resource Recycling Changsha 410083China Engineering research center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Institute of resources utilization and Rare Earth Development Guangdong Academy of SciencesGuangzhou 510560China

With the number of decommissioned electric vehicles increasing annually,a large amount of discarded power battery cathode material is in urgent need of ***,common leaching methods for recovering metal salts are economically inefficient and ***,the recycled material obtained by lithium remediation alone has limited performance in cycling ***,a short method of solid-phase reduction is developed to recover spent LiFePO4 by simultaneously introducing Mg2+ions for hetero-atom *** of particle agglomeration,carbon layer breakage,lithium loss,and Fe3+defects in spent LiFePO4 are also *** show that Mg2+addition during regeneration can remarkably enhance the crystal structure stability and improve the Li+diffusion *** regenerated LiFePO4 exhibits significantly improved electrochemical performance with a specific discharge capacity of 143.2 mAh·g^(−1)at 0.2 C,and its capacity retention is extremely increased from 37.9%to 98.5%over 200 cycles at 1 ***,its discharge capacity can reach 95.5 mAh·g^(−1)at 10 C,which is higher than that of spent LiFePO4(55.9 mAh·g^(−1)).All these results show that the proposed regeneration strategy of simultaneous carbon coating and Mg2+doping is suitable for the efficient treatment of spent LiFePO4.

关键词： spent LiFePO4 solid-phase reduction repair and regeneration cathode materials lithium-ion batteries

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A generalizable strategy based on the rule of“like dissolves like”to construct porous liquids with low viscosity for CO_(2)capture

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Nano research 2023年第7期16卷 10369-10380页

作者： Yangyang Xin Hailong Ning Dechao Wang(✉) Xiaoqian Li Wendi Fan Xiaoqian Ju Hongni Wang Yichi Zhang Zhiyuan Yang Dongdong Yao Yaping Zheng School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023China College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of coal resources Exploration and comprehensive utilization Ministry of Natural ResourcesXi’an 710021China

Porous liquids(PLs),an emerging porous material with permanent cavities,have attracted extensive attention in recent ***,the current construction methods are complicated and resulting PLs possess high viscosity values,which cannot meet the requirements of practical industrial ***,we demonstrate a generalizable and simple strategy to prepare type III PLs with low viscosity based on the rule of“like dissolves like”.Specifically,the monoglycidyl ether terminated polydimethylsiloxane(denoted by E-PDMS)is attached to the surface of Universitetet i Oslo(UiO)-66-NH_(2)via covalent linkage,constructing the pore generator(UiO-66-NH_(2)-E-PDMS,denoted by P-UiO-66).Then,P-UiO-66 is dispersed into different types and amounts of sterically hindered solvents(PDMS400 or PDMS6000),obtaining a series of type III PLs(denoted by P-UiO-66-PLs)with permanent cavities and low *** gas sorption-desorption test shows that P-UiO-66-PLs have an enormous potential for CO_(2)/N_(2) selective ***,the porosity of P-UiO-66-PLs and the CO_(2)sorption mechanism are demonstrated by molecular ***,the generality of the synthesis strategy is confirmed by the successful construction of PLs using two other amino-metal-organic frameworks(MOFs)(MIL-53(Al)-NH_(2)and MIL-88B(Fe)-NH_(2)).Importantly,it’s worth noting that the strategy based on the rule of“like dissolves like”sheds light on the preparation of other types of PLs for task-specific applications.

关键词： porous liquids like dissolves like CO_(2)capture low viscosity

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Multifunctional N,S-doped and methionine functionalized carbon dots for on−off−on Fe^(3+)and ascorbic acid sensing,cell imaging,and fluorescent ink applying

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Nano research 2023年第4期16卷 5401-5411页

作者： Zheng Yang Tiantian Xu Shaobing Zhang Hui Li Yali Ji Xiaodan Jia Jianli Li Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127China College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of coal resources Exploration and comprehensive utilization Ministry of Land and ResourcesXi’an 710012China

Fluorescent carbon dots(CDs)have been identified as potential nanosensors and attracted tremendous research interests in wide areas including anti-counterfeiting,environmental and biological sensing and imaging in considering of the attractive optical *** this work,we present a CDs based fluorescent sensor from polyvinylpyrrolidone,citric acid,and methionine as precursors by hydrothermal *** selective quantifying of Fe^(3+)and ascorbic acid(AA)are based on the fluorescent on-off-on process,in which the fluorescent quenching is induced by the coordination of the Fe^(3+)on the surface of the CDs,while the fluorescence recovery is mainly attributed to redox reaction between Fe^(3+)and AA,breaking the coordination and bringing the fluorescence *** by the good water solubility and biocompatibility,significant photostability,superior photobleaching resistance as well as high selectivity,sensitivity,and interference immunity,which are constructed mainly from the N,S-doping and methionine surface functionalization,the CDs have not only been employed as fluorescence ink in multiple anticounterfeiting printing and confidential document writing or transmitting,but also been developed as promising fluorescence sensors in solution and solid by CDs doped test strips and hydrogels for effectively monitoring and removing of Fe^(3+)and AA in environmental aqueous *** CDs have been also implemented as effective diagnostic candidates for imaging and tracking of Fe^(3+)and AA in living cells,accelerating the understanding of their function and importance in related biological processes for the prevention and treatment specific diseases.

关键词： carbon dots fluorescent sensors Fe^(3+) ascorbic acid fluorescent ink message encryption

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Selective preparation of light aromatic hydrocarbons from catalytic fast pyrolysis vapors of coal tar asphaltene over transition metal ion modified zeolites

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Chinese Journal of Chemical Engineering 2021年第7期34卷 275-287页

作者： Yongqi Liu Qiuxiang Yao Ming Sun Xiaoxun Ma School of Chemical Engineering Northwest UniversityInternational Science&Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon ResourcesChemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei EnergyShaanxi Research Center of Engineering Technology for Clean Coal ConversionCollaborative Innovation Center for Development of Energy and Chemical Industry in Northern ShaanxiXi’an 710069China

The catalytic cracking of coal tar asphaltene(CTA)pyrolysis vapors was carried out over transition metalion modified zeolites to promote the generation of light aromatic hydrocarbons(L-ArHs)in a pyrolysisgas chromatography/mass spectrometry(Py-GC/MS)micro-reactor *** effects of ultra stable Y(USY),Co/USY and Mo/USY on the selectivity and yield of L-ArHs products and the extent of deoxygenation(Edeoxygenation),lightweight(Elightweight)from CTA pyrolysis volatiles were *** showed that the yields of L-ArHs are mainly controlled by the acid sites and specific surface area of the catalysts,while the deoxygenation effect is determined by theirs pore *** Eligltweight of CTA pyrolysis volatiles over USY is 9.65%,while the Edeoxygenation of CTA pyrolysis volatiles over Mo/USY reaches 20.85%.Additionally,the modified zeolites(Mo/USY and Co/USY)exhibit better performance than USY on L-ArHs production,owing to the synergistic effect of metal ions(Mo,Co)and acid sites of *** with the non-catalytic fast pyrolysis of CTA,the total yield of L-ArHs obtained over USY(4032 mg·kg^(-1)),Co/USY(4363 mg·kg^(-1))and Mo/USY(4953 mg·kg^(-1))were increased by 27.03%,38.19%and 54.78%,***,the possible catalytic conversion mechanism of transition metal ion(Co and Mo)modified zeolites was proposed based on the distribution of products and the characterizations of catalysts.

关键词： coal tar asphaltene Transition metal ion modification Deoxygenation Lightweight Light aromatic compounds

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Rapid Determination of Tetrodotoxin in Human Plasma by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

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Chemical research in Chinese Universities 2018年第6期34卷 905-911页

作者： CHEN Weizhu ZHANG Yiping SUN Jipeng XIE Quanling HONG Zhuan YI Ruizao Third Institute of Oceanography State Oceanic AdministrationXiamen 361005P.R.China Engineering research center of Marine Biological Resource comprehensive utilization State Oceanic AdministrationXiamen 361005P.R.China Fujian Collaborative Innovation center for Exploitation and utilization of Marine Biological resources Xiamen 361005 P.R.China

A sensitive analytical method was developed to determine tetrodotoxin（TTX） in human plasma samples using protein precipitation, followed by ultra performance liquid chromatography（UPLC） analysis coupled with tandem mass spectrometry（MS/MS） using 11-deoxytetrodotoxin（11-deoxyTTX） as an internal standard. The plasma samples were prepared using protein precipitation prior to being analyzed by UPLC-MSfMS to identify TTX over a zwitterionic-hydrophilic interaction liquid chromatography column. The retention time values of TTX and 11-deoxyTTX were 4.12 and 3.67 min, respectively. TTX and 11-deoxyTTX were monitored and quantitated on the basis of their ion transitions for their respective precursor ions to their product ions（i.e., m/z 320.0→162. l for TTX and m/z 304.0→176.0 for 11-deoxyTTX） in the multiple reaction-monitoring mode. The lower limit of quantification of this method was determined to be 0.0199 ug/mL. This method showed good linearity for plasma samples that contained TTX concentrations in the range of 0.0199--1.99 ng/mL. The specificity, precision, accuracy, matrix effect, and stability characteristics of this method were also examined. The intra-assay precision and accuracy ranged from 1.89% to 6.00% and from 92.21% to 100.00%, whereas the inter-assay precision and accuracy ranged from 0.64% to 7.75% and from 99.38% to 101.26%, respectively. This new method therefore represents a rapid, accurate, reliable, and highly sensitive method for the qualitative and quantitative analyses of a trace amount of TTX in human plasma samples.

关键词： Tetrodotoxin(TTX) 11-DeoxyTTX Ultra performance liquid chromatography(UPLC)coupled with tandem mass spectrometry(MS/MS) Plasma Protein precipitation

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Global Marine Cold Seep Metagenomes Reveal Diversity of Taxonomy,Metabolic Function,and Natural Products

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Genomics, Proteomics & Bioinformatics 2024年第2期22卷 121-134页

作者： Tao Yu Yingfeng Luo Xinyu Tan Dahe Zhao Xiaochun Bi Chenji Li Yanning Zheng Hua Xiang Songnian Hu State Key Laboratory of Microbial resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Cold seeps in the deep sea are closely linked to energy exploration as well as global climate *** alkane-dominated chemical energy-driven model makes cold seeps an oasis of deep-sea life,showcasing an unparalleled reservoir of microbial genetic ***,by analyzing 113 metagenomes collected from 14 global sites across 5 cold seep types,we present a comprehensive Cold Seep Microbiomic Database(CSMD)to archive the genomic and functional diversity of cold seep *** CSMD includes over 49 million non-redundant genes and 3175 metagenome-assembled genomes,which represent 1895 species spanning 105 *** addition,beta diversity analysis indicates that both the sampling site and cold seep type have a substantial impact on the prokaryotic microbiome community *** and anaerobic metabolisms are prevalent in microbial communities,accompanied by considerable mixotrophs and facultative anaerobes,highlighting the versatile metabolic potential in cold ***,secondary metabolic gene cluster analysis indicates that at least 98.81%of the sequences potentially encode novel natural products,with ribosomally synthesized and post-translationally modified peptides being the predominant type widely distributed in archaea and ***,the CSMD represents a valuable resource that would enhance the understanding and utilization of global cold seep microbiomes.

关键词： Global marine cold seep Metagenome Prokaryotic microbiome Metabolic function Natural product

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