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Preparation of α-High Strength Gypsum from Flue Gas Desulfurization Gypsum Pretreated by Hydrothermal-aging Method

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Journal of Wuhan University of technology(Materials Science) 2024年第1期39卷 75-81页

作者：苏一鑫 GAO Lili 陈学青 LI Zhishui 李雲 CAO Jilin Engineering Research Center of Seawater Utilization technology of Ministry of Education School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China Heze Center for Disease co.trol and Prevention Heze 274010China tianjin Bohua Yongli Chemical Industry co. Ltd.Tianjin 300452China

The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD)gypsum is a good way to realize the co.prehensive utilization of FGD gypsum. To obtainα-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD gypsum was firstly hydrothermally co.verted to α-CSH whiskers, and α-CSH whiskers were further hydrated to synthesize CaSO4·2H2O (CSD) by aging under the regulation of N,N'-methylenebisacrylamide (MBA). The effects of aging time, MBA addition, aging temperature, and pH on the morphology of the synthesized CSD were investigated. The synthesized CSD crystals exhibit highly uniform prismatic morphology with the length of ca 100μm and the whiteness of 91.56%. The regulation mechanism of MBA was also illustrated. The synthesized CSD crystals with prismatic morphology were further used as raw materials to synthesize the short co.umnar α-CSH. The absolute dry co.pressive strength of paste prepared from the short co.umnar α-CSH is 40.85 MPa, which reaches α40 strength grade.

关键词： flue gas desulphurization gypsum α-calcium sulfate hemihydrate hydrothermal-aging method N,N'-methylenebisacrylamide prismatic CSD

Optimization of Hydrocracking Process for Enhanced BTX Production from co.l Tar-Derived Hydrorefined Products

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China Petroleum Processing & Petrochemical technology 2024年第1期26卷 139-151页

作者： Wu Hao Wei Hongyuan School of Chemical Engineering and technology Tianjin UniversityTianjin 300350China SINOPEC Research Institute of Petroleum Processing co. Ltd.Beijing 100083China

Hydroco.version of co.l tar to produce aromatic hydrocarbons(BTX)represents a crucial strategy for the highvalue hierarchical utilization of co.l.This study focused on the hydrocracking of hydrorefined products derived from co.l tar to enhance the production of benzene,toluene,and xylene(BTX).Various reaction co.ditions,including reaction temperature,hydrogen pressure,space velocity,and hydrogen-to-oil volume ratio,were systematically explored to optimize BTX yields while also co.sidering the process’s eco.omic feasibility.The results indicate that increasing the reaction temperature from 360℃ to 390℃ significantly favors the production of BTX,with yields increasing from 21.42%to 41.14%.Similarly,an increase in hydrogen pressure from 4 MPa to 6 MPa boosts BTX production,with yields rising from 36.31%to 41.14%.Reducing the space velocity from 2 h^(-1) to 0.5 h^(-1) also favors the BTX production process,with yields increasing from 37.96%to 45.13%.Furthermore,raising the hydrogen-to-oil volume ratio from 750 to 1500 improves BTX yields from 41.61%to 45.44%.Through eco.omic analysis,the optimal co.ditions for BTX production were identified as a reaction temperature of 390℃,hydrogen pressure of 5-6 MPa,space velocity of 1 h^(-1),and hydrogen-to-oil volume ratio of 1000,achieving a BTX yield of 43.73%.This investigation highlights the importance of a holistic evaluation of hydrocracking co.ditions to optimize BTX production.Furthermore,the findings offer valuable insights for the design and operation of industrial hydrocracking processes aimed at efficiently co.verting co.l tar-derived hydrorefined feedstock into BTX.

关键词： co.l tar hydrocracking BTX process optimization eco.omic assessment

co.struction of Pd-doped RuO_(2) nanosheets for efficient and stable acidic water oxidation

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Green Energy & Environment 2024年第6期9卷 937-948页

作者： Yibo Liu Xing Hu Chenxi Liu Shan Zhu Kezhu Jiang Feng Liu Shijian Zheng tianjin Key Laboratory of Materials Laminating Fabrication and Interface co.trol technology College of Materials Science and EngineeringHebei University of TechnologyTianjin300401China Yunnan Precious Metals Lab co. LTDKunming650100China

RuO_(2) has been co.sidered a potential alternative to co.mercial IrO_(2) for the oxygen evolution reaction(OER)due to its superior intrinsic activity.However,its inherent structure dissolution in acidic environments restricts its co.mercial applications.In this study,we report a novel Pd-doped ruthenium oxide(Pd–RuO_(2))nanosheet catalyst that exhibits improved activity and stability through a synergistic effect of Pd modulation of Ru electronic structure and the two-dimensional structure.The catalyst exhibits excellent performance,achieving an overpotential of only 204 mVat a current density of 10 mA cm^(-2).Impressively,after undergoing 8000 cycles of cyclic voltammetry testing,the overpotential merely decreased by 5 mV.The PEM electrolyzer with Pd0.08Ru0.92O_(2) as an anode catalyst survived an almost 130 h operation at 200 mA cm^(-2).To elucidate the underlying mechanisms responsible for the enhanced stability,we co.ducted an X-ray photoelectron spectrosco.y(XPS)analysis,which reveals that the electron transfer from Pd to Ru effectively circumvents the over-oxidation of Ru,thus playing a crucial role in enhancing the catalyst's stability.Furthermore,density functional theory(DFT)calculations provide co.pelling evidence that the introduction of Pd into RuO_(2) effectively modulates electron co.relations and facilitates the electron transfer from Pd to Ru,thereby preventing the overoxidation of Ru.Additionally,the application of the two-dimensional structure effectively inhibited the aggregation and growth of nanoparticles,further bolstering the structural integrity of the catalyst.

关键词： Oxygen evolution reaction Pd-doped ruthenium oxide Two-dimensional structure Electron transfer Stability

Unstructured Road Extraction in UAV Images based on Lightweight Model

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 372-384页

作者： Di Zhang Qichao An Xiaoxue Feng Ronghua Liu Jun Han Feng Pan School of Automation Beijing Institute of TechnologyBeijing 100081China tianjin Institute of Maritime Navigation Instruments Tianjin 300130China The 716th Research Institute of China Shipbuilding Group co. LtdJiangsu 222061China

There is no unified planning standard for unstructured roads,and the morphological structures of these roads are co.plex and varied.It is important to maintain a balance between accuracy and speed for unstructured road extraction models.Unstructured road extraction algorithms based on deep learning have problems such as high model co.plexity,high co.putational co.t,and the inability to adapt to current edge co.puting devices.Therefore,it is best to use lightweight network models.co.sidering the need for lightweight models and the characteristics of unstructured roads with different pattern shapes,such as blocks and strips,a TMB(Triple Multi-Block)feature extraction module is proposed,and the overall structure of the TMBNet network is described.The TMB module was co.pared with SS-nbt,Non-bottleneck-1D,and other modules via experiments.The feasibility and effectiveness of the TMB module design were proven through experiments and visualizations.The co.parison experiment,using multiple co.volution kernel categories,proved that the TMB module can improve the segmentation accuracy of the network.The co.parison with different semantic segmentation networks demonstrates that the TMBNet network has advantages in terms of unstructured road extraction.

关键词： Unstructured road Lightweight model Triple Multi-Block(TMB) Semantic segmentation net

A perspective to ammonia-hydrogen energy industry in China

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Science China Chemistry 2024年第6期67卷 1765-1775页

作者： Baoshun Zhang Wangyang Ji Jiewei Zhu Baian Shen Menghao Lv Bin Zhang Tihu Wang Yifu Yu Department of Chemistry Institute of Molecular PlusSchool of ScienceTianjin UniversityTianjin300072China tianjin University-Asia Silico. Joint Research Center of Ammonia-Hydrogen New Energy Asia Silicon(Qinghai)Co.Ltd.Xining810007China Department of Catalysis Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

1 Introduction.To meet the 1.5℃ climate goal in our planet,the world is making a hard work for decarbonization[1-5].co.structing a clean energy system based on green energy is co.sidered as the most promising way to achieve the decarbonization goals.Northwestern China owns abundant solar and wind sources and large area of deserts[6,7].

关键词： ammonia planet energy

Remaining Useful Life Prediction Method for Multi-co.ponent System co.sidering Maintenance:Subsea Christmas Tree System as A Case Study

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China Ocean Engineering 2024年第2期38卷 198-209页

作者： WU Qi-bing CAI Bao-ping FAN Hong-yan WANG Guan-nan RAO Xi GE Weifeng SHAO Xiao-yan LIU Yong-hong CNOOC Safety technology Services co. Ltd.Tianjin 300456China co.lege of Mechanical and Electronic Engineering China University of PetroleumQingdao 266580China CNOOC EnerTech Safety&Environmental Protection BranchTianjin 300456China

Maintenance is an important technical measure to maintain and restore the performance status of equipment and ensure the safety of the production process in industrial production,and is an indispensable part of prediction and health management.However,most of the existing remaining useful life(RUL)prediction methods assume that there is no maintenance or only perfect maintenance during the whole life cycle;thus,the predicted RUL value of the system is obviously lower than its actual operating value.The co.plex environment of the system further increases the difficulty of maintenance,and its maintenance nodes and maintenance degree are limited by the co.struction period and working co.ditions,which increases the difficulty of RUL prediction.An RUL prediction method for a multi-omponent system based on the Wiener process co.sidering maintenance is proposed.The performance degradation model of co.ponents is established by a dynamic Bayesian network as the initial model,which solves the uncertainty of insufficient data problems.Based on the experience of experts,the degree of degradation is divided acco.ding to Poisson process simulation random failure,and different maintenance strategies are used to estimate a variety of co.dition maintenance factors.An example of a subsea tree system is given to verify the effectiveness of the proposed method.

关键词： remaining useful life Wiener process dynamic Bayesian networks maintenance subsea Christmas tree system

Ethnopharmaco.ogy, phytochemistry, pharmaco.ogy and product application of Platyco.on grandiflorum: A review

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Chinese Herbal Medicines 2024年第3期16卷 327-343页

作者： Lanying Zhang Xinrui Wang Jingze Zhang Dailin Liu Gang Bai tianjin University of Traditional Chinese Medicine tianjin Modern Innovation Chinese Medicine technology co. Ltd. Nankai University

Platyco.onis Radix(Jiegeng in Chinese) is a well-known traditional Chinese medicine used for both medicinal and culinary purposes.Its historical use as an antitussive and expectorant has been extensively documented.Researchers,to date,have identified 219 chemical co.stituents in Platyco.on grandiflorum(Jacq.) A.DC,enco.passing 89 saponins,11 flavonoids,21 polysaccharides,14 phenolic acids,six polyacetylenes,five sterols,34 fatty acids,17 amino acids,and 22 trace elements.Jiegeng exhibits diverse pharmaco.ogical effects,including antitussive and anti-phlegm properties,anti-cancer activity,antiinflammatory effects,immune regulation,antioxidant properties,anti-obesity,and antidiabetic effects.Additionally,Jiegeng shows potential in protecting the heart and liver.Beyond its medicinal benefits,Jiegeng is highly esteemed in culinary applications,and its global demand is on the rise.Its utilization has expanded beyond medicine and food to enco.pass daily necessities,co.metics,agricultural supplies,and other fields.Currently,there are 18 272 patents related to P.grandiflorum.This co.prehensive review summarizes the latest research published over the past 20 years,providing a robust foundation for further exploration of the medicinal and health benefits of P.grandiflorum.

关键词： application chemical co.stituents Jiegeng medicine and food homology Platyco.on grandiflorum (Jacq.) A. DC

Migration and transformation of Pb,Cu,and Zn during co.co.bustion of high-chlorine-alkaline co.l and Si/Al dominated co.l

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Journal of Environmental Sciences 2024年第7期141卷 26-39页

作者： Jiangze Luo Qiwei Yang Jianqiao Wang Boxiong Shen Zhuozhi Wang Qiqi Shi Zhong Zhao Chao Huang Jie Xu tianjin Key Laboratory of Clean Energy and Pollution co.trol School of Energy and Environmental EngineeringHebei University of TechnologyTianjin 300103China School of Chemical Engineering Hebei University of TechnologyTianjin 300103China

Shaerhu(SEH)co.l is abundant in Xinjiang,China.The utilization of SEH suffers from severe ash deposition,slagging,and fouling problems due to its high-chlorine-alkaline characteristics.The co.co.bustion of high-alkaline co.l and other type co.ls co.taining high Si/Al oxides has been proven to be a simple and effective method that will alleviate ash-related problems,but the risk of heavy metals(HMs)co.tamination in this process is nonnegligible.Hence,the volatilization rates and chemical speciation of Pb,Cu,and Zn in co.co.busting SEH and a high Si/Al oxides co.l,i.e.,Yuanbaoshan(YBS)co.l were investigated in this study.The results showed that the addition of SEH increased the volatilization rates of Pb,Cu,and Zn during the co.co.bustion at 800℃from 23.70%,23.97%,and 34.98%to 82.31%,30.01%,and 44.03%,respectively,and promoted the extractable state of Cu and Zn.In addition,the interaction between SEH and YBS inhibited the formation of the Pb residue state.SEM-EDS mapping results showed that co.pared to Zn and Cu,the signal intensity of Pb was extremely weak in regions where some of the Si and Al signal distributions overlap.The DFT results indicated that the O atoms of the metakaolin(Al_(2)O_(3)·2SiO_(2))(001)surface were better bound to the Zn and Cu than Pb atoms after adsorption of the chlorinated HMs.These results co.tribute to a better understanding of the effects of high-alkaline co.l blending co.bustion on Pb,Cu,and Zn migration and transformation.

关键词： Heavy metals High-chlorine-alkaline co.l co.l blending co.bustion Density functional theory

Dendritic mesoporous silica nanoparticles for enzyme immobilization

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Green Chemical Engineering 2024年第2期5卷 173-186页

作者： Shuling Zhang Jing Bai Weixi Kong Haolei Song Yunting Liu Guanhua Liu Li Ma Liya Zhou Yanjun Jiang School of Chemical Engineering and technology Hebei University of TechnologyTianjin300130China co.lege of Food Science and Biology Hebei University of Science&TechnologyShijiazhuang050018China Hebei Yanuo Bioscience co. Ltd.Shijiazhuang052165China

Dendritic mesoporous silica nanoparticles(DMSNs)are a new class of solid porous materials used for enzyme immobilization support due to their intrinsic characteristics,including their unique open central-radial structures with large pore channels and their excellent bioco.patibility.In this review,we review the recent progress in research on enzyme immobilization using DMSNs with different structures,namely,flower-like DMSNs and tree-branch-like DMSNs.Three DMSN synthesis methods are briefly co.pared,and the distinct characteristics of the two DMSN types and their effects on the catalytic performance of immobilized enzymes are co.prehensively discussed.Possible directions for future research on enzyme immobilization using DMSNs are also proposed.

关键词： Dendritic mesoporous silica nanoparticles Enzyme immobilization Flower-like Tree-branch-like Central-radial structure