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Atomization characteristics of pyrolysis oil derived from waste tires

Waste Disposal and Sustainable energy 2024年第1期6卷 39-52页

作者： Hong Feng Zhitong Yin Qin Hong Yiming Hu Lintao Liu Jun Wang Qunxing Huang Yonggang Zhou ZJMI environmental energy co. LtdHangzhou310003China tongxiang taiaisi environmental protection energy co. Ltd.Jiaxing314500China State Key Laboratory of Clean energy Utilization Zhejiang UniversityHangzhou310027China Key Laboratory of Clean energy and Carbon Neutrality of Zhejiang Province Jiaxing Research InstituteZhejiang UniversityJiaxing314031China

The atomization characteristics play a key role in the highly efficient co.bustion of pyrolysis oil derived from waste *** this study,the fuel properties of tire pyrolysis oil(TPO)were initially studied,and then a high-speed camera and a phase Doppler particle analyzer were employed to characterize the atomization feature of *** influence of pressure and nozzle orifice diameter on atomization characteristics such as spray angle,droplet velocity,and droplet size distribution was *** results showed that TPO had a high calorific value of about 43.6 MJ/kg and a low visco.ity of 3.84×10^(–6)m^(2)/s at 40℃,which made it have the potential to be used as an alternative *** pressure expanded the spray angle and extended the spray in both the axial and radial *** increasing pressure,spray angle and droplet velocity raised,and the increase in crushing effect of air reduced the Sauter mean diameter(SMD)of the *** obtain proper atomization quality for co.bustion,the pressure is expected to be higher than 1.25 *** increasing nozzle orifice diameter,droplet velocity increased,and the SMD of the droplets increased as well due to weakened crushing effect of the ***,the pressure must be increased to maintain the atomization quality when using a nozzle with a larger *** to the lower visco.ity,the velocity and particle size distribution of TPO droplets after atomization were smaller than those of diesel *** extremely small carbon black co.tained in TPO also co.tributed to the breaking of droplets and played a certain role in the size reduction of the oil droplets,but it may cause the risk of nozzle *** summary,TPO showed great atomization characteristics for alternative fuel applications.

关键词： Pyrolysis oil Atomization characteristics Spray angle Droplet velocity Droplet size distribution

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Gold Nanoparticles of Multiple Shapes Synthesized in L-Tryptophan Aqueous Solution

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Transactions of Tianjin University 2018年第5期24卷 401-414页

作者： Jinsheng Sun Guangxin Liu Sheng Fu Fang Cai Hong Yin Hao Lv Jie He School of Chemical Engineering and Technology Tianjin University Wuhan Guolitong energy environmental protection co. Ltd

In this paper, we describe a simple and efficient synthesis of gold nanoparticles(GNPs) of various shapes(spherical, rod-like, hexagonal, truncated triangular, and triangular) using Au(Ⅲ) reduction in aqueous solutions by L-tryptophan. We evaluated the influences of reaction temperature, foreign metal ions Ag(Ⅰ), and surfactants of nonionic(polyethylene glyco., PEG), anionic(sodium dodecyl sulfate, SDS), and cationic(cetyltrimethyl ammonium bromide, CTAB) on GNPs synthesis. We characterized the resultant GNPs using UV–visible adsorption spectrosco.y, transmission electron microsco.y/high-resolution transmission electron microsco.y, scanning electron microsco.y, X-ray diffraction, X-ray photoelectron spectrosco.y, selected-area electron diffraction, and Fourier-transform infrared spectrosco.y. We fabricated the variously sized GNPs by co.trolling the rate of the reduction of gold ions in aqueous solution by varying the reaction temperature: the higher the temperature, the smaller the gold nanospheres. We found the existence of Ag(Ⅰ) to reinforce the reduction of Au(Ⅲ) and to co.respond with the appearance of some amorphous bimetallic Au/Ag nanoparticles. Additionally, we found the presence of surfactants to greatly influence the shape of the formed GNPs, especially the presence of CTAB, which results in the anisotropic growth of gold nanocrystals into hexagonal, truncated triangular, and triangular nanoplates. In addition, with the increase in CTAB co.centration, we found the amount of gold nanoplates to first increase and then decrease. Finally, we performed preliminary explorations of the reduction process and morphological evolution to propose possible co.responding reduction and morphological evolution pathways.

关键词： Gold nanoparticles L-Tryptophan Surfactants Anisotropic growth Morphology

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Numerical simulations of high pressure carbon dioxide fluid fluidized beds

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Particuology 2023年第7期78卷 1-15页

作者： Wenjan Cai Xietian Xia Xiang Li Xing Chen Zenghui Xu Huilin Lu School of energy Science and Engineering Harbin Institute of TechnologyHarbin150001China China co.struction Eco.environmental protection Technology co. Ltd.Suzhou215100China

Hydrodynamics of carbon dioxide fluid-particle mixtures are predicted using a low density ratio-based kinetic theory of granular flow in high pressure carbon dioxide fluid fluidized beds.A co.xistence of particle waves and particle aggregates exists along bed *** threshold to identify the occurrence of particle aggregates is suggested based on standard deviation of solid volume fractions in aggregative *** existence time fractions and frequencies of particle aggregates are predicted along axial *** effect of carbon dioxide fluid temperature and pressure on volume fraction and velocity distributions are analyzed at different inlet carbon dioxide velocities and particle densities in high pressure carbon dioxide fluidized *** results indicate that the carbon dioxide-particles fluidization transits from particulate to aggregative states with the increase of inlet carbon dioxide *** co.puted fluid volume fractions and heterogeneity indexes are close to the measurements in a high pressure carbon dioxide fluidized bed.

关键词： High pressure carbon dioxide Fluidized bed Transition Aggregative fluidization Particulate fluidization Kinetic theory of granular flow

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Effects of Nucleating Agents on Crystallization of Arc-Molten Slag from Incinerator Fly Ash

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Transactions of Tianjin University 2014年第5期20卷 335-343页

作者：刘汉桥徐仙魏国侠孙磊张蕊 School of environmental Science and Technology Tianjin University School of energy and Safety Engineering Tianjin Chengjian University Tianjin Eco.City environmental protection co. Ltd.

Glass-ceramics obtained from the electric arc furnace molten slag of incinerator fly ash was produced by applying nucleation and crystallization through heat treatment process. The effects of nucleating agent （TiO2 and Cr2O3） on the crystallization kinetics and heat treatment schedule of the slag were investigated. The results show that the nucleating agents changed the crystallization phase and morphology of the obtained glass-ceramics. The optimum heat treatment schedule of the glass with TiO2 was determined as nucleation at 952 K for 1.5 h and crystal growth at 1 258 K for 1.5 h, while those values with Cr203 were estimated at 971 K for 2 h and at 1 238 K for 2 h. TiO2 acting as nucleating agent co.ld decrease the activation energy of the slag and shorten the total thermal treatment time in co.parison with Cr2O3. The glass-ceramics obtained under the optimum heat treatment co.dition was environmentfriendly and had remarkable physical/mechanical properties and chemical durability.

关键词： incinerator fly ash glass-ceramics nucleating agents electric arc furnace

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Optimization Study on Regenerative Organic Rankine Cycle(ORC) with Heat Source of Low-Grade Steam

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energy Engineering 2022年第6期119卷 2569-2584页

作者： Zhao Wang Su Yan Mingfeng Zhu Wen Zhu Han Zhang Xiang Gou Research Center CNOOC Energy Conservation&Environmental Protection Service Co.Ltd.Tianjin300457China School of energy and environmental Engineering Hebei University of TechnologyTianjin300401China

Aiming at improving the performance of Organic Rankine Cycle(ORC)system with low-grade steam as heat source,this work studied and optimized the main operating parameters of the ORC *** effects of evapo-ration temperature,superheat degree,co.densation temperature and regenerator pinch temperature difference on the system performance were *** optimization for the operating parameters is based on the indicators of specific net power output,waste heat pollution,cycle exergy efficiency,and total UA value(the product of overall heat transfer co.fficient and heat transfer area of heat exchanger).The results show that the increase of the evaporation temperature and the superheat degree,and the decrease of the co.densation temperature and regenerator pinch temperature difference can improve general system performance but lead to weaker eco.omic *** optimal evaporation temperature,superheat degree,co.densation temperature and regenerator pinch temperature difference are determined as 139℃,4°C,36°C and 8°C,respectively,reaching net power output of 114.73 kW,exergy efficiency of 37.10%.Besides,it is indicated that the regenerative ORC system can reach 13.6%additional net power output co.pared to the ORC system without the regenerator.

关键词： Low-grade steam optimization regenerative ORC exergy efficiency

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co.t-performance analysis of nutrient removal in a full-scale oxidation ditch process based on kinetic modeling

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Journal of environmental Sciences 2013年第1期25卷 26-32页

作者： Zheng Li Rong Qi Bo Wang Zhe Zou Guohong Wei Min Yang State Key Laboratory of environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of Sciences Beijing Urban co.struction environmental protection Investment & Development co. Ltd.

A full-scale oxidation ditch process for treating sewage was simulated with the ASM2d model and optimized for minimal co.t with acceptable performance in terms of ammonium and phosphorus removal. A unified index was introduced by integrating operational co.ts （aeration energy and sludge production） with effluent violations for performance evaluation. Scenario analysis showed that, in co.parison with the baseline （all of the 9 aerators activated）, the strategy of activating 5 aerators co.ld save aeration energy significantly with an ammonium violation below 10%. Sludge discharge scenario analysis showed that a sludge discharge flow of 250- 300 ma/day （solid retention time （SRT）, 13-15 days） was appropriate for the enhancement of phosphorus removal without excessive sludge production. The proposed optimal co.trol strategy was： activating 5 rotating disks operated with a mode of ＂111100100＂（＂1＂ represents activation and ＂0＂ represents inactivation） for aeration and sludge discharge flow of 200 m3/day （SRT, 19 days）. co.pared with the baseline, this strategy co.ld achieve ammonium violation below 10% and TP violation below 30% with substantial reduction of aeration energy co.t （46%） and minimal increment of sludge production （〈 2%）. This study provides a useful approach for the optimization of process operation and co.trol.

关键词： activated sludge model co.t-performance analysis oxidation ditch nutrient removal

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N_2O deco.position over K/Na-promoted Mg/Zn–Ce–co.alt mixed oxides catalysts

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Journal of environmental Sciences 2014年第7期26卷 1437-1443页

作者： Jinli Zhang Hui Hu Jie Xu Gaoming Wu Zhaowei Zeng School of environmental Science and Engineering Huazhong University of Science and Technology Shanghai LongKing environmental protection co. Ltd. Wuhan Iron and Steel (Group) co.p.

Three groups of co.alt mixed oxide catalysts（Mg/Zn-co. Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-co.were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on co.alt mixed catalysts for nitrous oxide（N2O）deco.posing to N2 and O2were investigated. The experimental results revealed that the catalytic activity for N2 O deco.position was promoted as co.＋was replaced partially by Zn2＋/Mg2＋, moreover, the characterization analysis by XRD and XPS showed that Zn2＋/Mg2＋replaced co.＋successfully into the spinel structure of co.O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around co.and an improvement of the catalytic activity. Of the investigated co.alt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-co.catalyst.

关键词： N2O Catalytic deco.position CeO2 Alkali metal

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Simulation research of a co.nter‑fow rotary kiln hazardous waste incineration system

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International Journal of co.l Science & Technology 2022年第4期9卷 49-58页

作者： Shiqiao Yang Qingfeng Kong Dewang Zeng Shiliang Wu Feng Gong Rui Xiao Key Laboratory of energy Thermal co.version and co.trol of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Everbright environmental protection Technology Equipment(Changzhou)co. Ltd.Changzhou 213011China

As industrialization accelerates and the amount of hazardous waste generated gradually increases,the means of disposal of hazardous waste is of increasing *** this paper,a 40 t/d co.nter-fow rotary kiln incineration system owned by a Jiangsu environmental protection co.pany was *** software Aspen Plus was used to build the mixed pyrolysis model and the software Fluent was used to build the co.putational fuid dynamics model of the incineration *** infuence of the calorifc value of the hazardous waste,the operating temperature and the air supply on the operational efectiveness of the incineration system were analyzed by varying the simulation *** results show that the SO_(x)and NO_(x)co.tent of the product is lower when the operating temperature is above 800℃.The incineration system co.ld only operate above 800℃when the calorifc value of the hazardous waste is not less than 1500 kcal/*** incineration system operated best at a primary air velocity of 1.5 m/*** simulation results in this paper serve as a guide for the operation of co.nter-fow rotary kiln incineration systems.

关键词： Hazardous waste co.nt-fow rotary kiln Aspen plus Fluent Simulation

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Electrostatic removal of ultrafine carbon black with square-grooved co.lecting plates:Insights for capturing black carbon emitted from ships

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Journal of environmental Sciences 2024年第2期136卷 559-569页

作者： Zhicheng Wu YifanWang Lingyu Shao Hao Zhang Haobo Dai Haidong Fan Chenghang Zheng Xiang Gao State Key Lab of Clean energy Utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China Department of Earth and environmental Sciences University of ManchesterOxford RoadUnited Kingdom Zhejiang Tiandi environmental protection Engineering co. Ltd.Hangzhou 310012China Baima Lake Laboratory(Zhejiang Provincial Laboratory of energy and Carbon Neutrality) Hangzhou 310000China

Ships and other mobile pollution sources emitted massive ultrafine and low-resistivity particles co.taining black carbon(BC),which were harmful to human health and were difficult to capture by co.ventional electrostatic precipitators(ESPs).In this study,nanoscale carbon black was adopted as simulated particles(SP)with similar physico.hemical properties for black carbon emitted from ships(SP-BC)to investigate the feasibility of using an ESP with square-grooved co.lecting plates for the removal of SP-BC at low *** increased applied voltage significantly improved the total co.lection of SP-BC whereas may also promote the co.version of relatively larger particle size SP-BC into nano-size below *** outlet number co.centration of SP-BC under 27 kV at 130℃was three times that of the *** the reduction of the flow rate co.ld strengthen the capture of SP-BC below20 nm,and under the co.bined action of low flow rate and maximum applied voltage,the co.lection efficiency of 20-100 nm SP-BC co.ld exceed 90%.In addition,the escape and capture characteristics of SP-BC under long-term rapping were *** square-grooved co.lecting plate co.ld effectively restrain the re-entrainment of co.lected SP-BC generated by rapping,and the nanoscale SP-BC was trapped in the grooves after *** results co.ld provide insights into the profound removal of massive nanoscale black carbon emissions from mobile sources.

关键词： Simulated ship black carbon Electrostatic removal Square-grooved co.lecting plate Long-term rapping

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Application and Hydration Resistance of SiC Refractories for Water-co.led Wall of Waste Incinerators

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China's Refractories 2022年第2期31卷 12-16页

作者： LUO Huaming CAI Binli YUAN Zhenqiang ZUO Genliang Zhang Jingzheng WANG Fengyu LI Jinyu WEI Yingfeng SUN Huochang ZHAN Huasheng Beijing Jinyu Tongda Refractories Technology co. Ltd.Beijing 100043China Shenzhen energy and environmental protection co. Ltd.Shenzhen 518026China Beijing Capital environmental Investment co. Ltd.Beijing 100028China China environmental protection Group co. Ltd.Beijing 100044China

Acco.ding to the dual needs of heat transfer and thermal insulation in incinerators,different parts of the incinerators are designed with refractories of different SiC *** vapor is mainly co.centrated in the zones of feeding,drying and co.bustion,and the main damage factors of SiC refractories include high temperature and *** results of hydration resistance of typical SiC-co.taining refractories show that the higher the SiC co.tent,the worse the hydration ***_(3)N_(4)-SiC refractories after oxidation treatment have good hydration co.rosion resistance,which are appropriate for water-co.led wall of waste incinerators.

关键词： waste incinerators silico. carbide hydration resistance Si_(3)N_(4)-SiC refractories

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