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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 combustion 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 viscosity 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 combustion,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 viscosity,the velocity and particle size distribution of TPO droplets after atomization were smaller than those of diesel *** extremely small carbon black contained in TPO also contributed 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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Prediction model of volume average diameter and analysis of atomization characteristics in electrostatic atomization minimum quantity lubrication

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Friction 2023年第11期11卷 2107-2131页

作者： Dongzhou JIA Changhe LI Jiahao LIU Yanbin ZHANG Min YANG Teng GAO Zafar SAID Shubham SHARMA School of Mechanical&Automotive Engineering Qingdao University of TechnologyQingdao 266520China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China College of Engineering University of SharjahSharjah 27272United Arab Emirates Mechanical Engineering Department University Center for Research and DevelopmentChandigarh UniversityMohaliPunjab 144603India

Minimum quantity lubrication(MQL)is a relatively efficient and clean alternative to flooding workpiece *** atomization has the merits of small droplet diameter,high uniformity of droplet size,and strong coating,hence its superiority to pneumatic ***,as the current research hotspot,the influence of jet parameters and electrical parameters on the average diameter of droplets is not ***,by observing the shape of the liquid film at the nozzle outlet,the influence law of air pressure and voltage on liquid film thickness(h)and transverse and longitudinal fluctuations are ***,the mathematical model of charged droplet volume average diameter(VAD)is constructed based on three dimensions of the liquid film,namely its thickness,transverse wavelength(λ_(h)),and longitudinal wavelength(λ_(z)).The model results under different working conditions are obtained by numerical *** of the model results with the experimental VAD of the droplet confirm the error of the mathematical model to be less than 10%.The droplet diameter distribution span value Rosin–Rammler distribution span(R.S)and percentage concentrations of PM10(particle size of less than 10μm)/PM2.5(particle size of less than 2.5μm)under different working conditions are further *** results show that electrostatic atomization not only reduces the diameter distribution span of atomized droplets but also significantly inhibits the formation of PM10 and PM2.5 fine-suspension *** the air pressure is 0.3 MPa,and the voltage is 40 kV,the percentage concentrations of PM10 and PM2.5 can be reduced by 80.72%and 92.05%,respectively,compared with that under the pure pneumatic atomization condition at 0.3 MPa.

关键词： minimum quantity lubrication(MQL) electrostatic atomization volume average diameter(VAD) atomization characteristics

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Experimental study on atomization characteristics and dust-reduction performance of four common types of pressure nozzles in underground coal mines

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International Journal of Coal Science & Technology 2020年第3期7卷 581-596页

作者： Han Han Pengfei Wang Ronghua Liu Chang Tian Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan University of Science and TechnologyXiangtan411201China School of Resource Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan411201China Department of Civil and Architectural Engineering and Mechanic University of ArizonaTucsonAZ85721USA

Pressure nozzle is commonly used in the dust-reduction techniques by spraying of underground coal *** on the internal structure,the pressure nozzle can be divided into the following types:spiral channel nozzle,tangential flow-guided nozzle and X-swirl *** order to provide better guidance on the selection of nozzles for the coal mine dust-reduction systems by spraying,we designed comparing experiments to study the atomization characteristics and dust-reduction performance of four commonly used nozzles in the coal mine underground with different internal *** the experimental results on the atomization characteristics,both the tangential flow-guided nozzle and the X-swirl nozzle have high flow *** atomization angle is the largest in the spiral non-porous nozzle,and smallest in both the X-swirl nozzle and the spiral porous *** spraying range and the droplet velocity are inversely proportional to the atomization *** the water pressure is low,the atomization performance of the spiral non-porous nozzle is the best among the four types of *** atomization performance of the X-swirl nozzle is superior to other types when the water pressure is *** the high water pressure,the particle size of the atomized droplets is smallest in the X-swirl *** the experiments on the dust-reduction performance of the four types of nozzles and the comprehensive analysis,the X-swirl nozzle is recommended for the coal mine application site with low water pressure in the dust-reduction system,while at the sites with high water pressure,the spiral non-porous nozzle is recommended,which has the lowest water consumption and obvious economic advantages.

关键词： Pressure nozzle atomization characteristics Dust-reduction performance Droplets Dust

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An experimental study on the atomization characteristics of the nozzle for the after-pot cooling of galvanized steel sheets

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Baosteel Technical Research 2010年第4期4卷 50-53页

作者： LIU Huafei1),XIANG Shunhua2)and MA Xinjian2)1)Auto Steel Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China2)Equipment Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China Auto Steel Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Equipment Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

Air-atomized fog cooling is particularly suitable for the after-pot cooling of galvanized steel *** air and water serving as working media,an experimental study was conducted on the atomization characteristics of a newly-developed cross-flow type of fog *** water flux distribution,spray angle and pressure of water and air were *** results show that the water droplet size was small and insensitive to the water flow *** spray angle was small and the water flow rate slightly affected the air pressure in the *** empirical correlation between the pressure in the chamber and the gas flow rate was obtained for the purpose of equipment design.

关键词： air-atomizing nozzle atomization characteristics spray angle

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Dust removal efficiency of high pressure atomization in underground coal mine

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International Journal of Mining Science and Technology 2018年第4期28卷 677-682页

作者： Pengfei Wang Xuanhao Tan Weimin Cheng Gang Guo Ronghua Liu School of Mining and Safety Engineering Shandong University of Science & Technology School of Resource Environment & Safety Engineering Hunan University of Science & Technology

To master theoretical calculation for dust removal efficiency of high pressure atomization in an underground coal mine, the corresponding atomization characteristics and dust removal efficiency were both comprehensively studied in theory by virtue of related theories of hydromechanics and *** to actual measurements of flow coefficients and atomization angles of X-type swirl nozzle,computational formula was derived for atomized particle sizes of such a nozzle in conjunction with relevant empirical equation. Moreover, a mathematical model for applying high pressure atomization to dust removal in underground coal mine was also established to deduce theoretical computation formula of fractional efficiency. Then, Matlab was adopted to portray the relation curve between fractional efficiency and influence factors. In addition, a theoretical formula was also set up for removal efficiency of respirable dust and total coal dust based on dust size and frequency distribution equations. In the end,impacts of dust characteristic parameters on various dust removal efficiencies were analyzed.

关键词： Underground coal mine High pressure atomization atomization characteristics Dust removal efficiency

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Investigations of the effects of two typical jet crushing methods on the atomization and dust reduction performance of nozzles

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International Journal of Coal Science & Technology 2023年第4期10卷 92-106页

作者： Han Han Hetang Wang Qi Zhang Yunhe Du Haojie Wang Hui Wang State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

Single-fuid nozzles and dual-fuid nozzles are the two typical jet crushing methods used in spray dust reduction. To distinguish the atomization mechanism of single-fuid and dual-fuid nozzles and improve dust control efciency at the coal mining faces, the atomization characteristics and dust reduction performance of the two nozzles were quantitatively compared. Results of experiments show that, as water supply pressure increased, the atomization angle of the swirl pressure nozzle reaches a maximum of 62° at 6 MPa and then decreases, but its droplet size shows an opposite trend with a minimum of 41.7 μm. The water supply pressure helps to improve the droplet size and the atomization angle of the internal mixing air–liquid nozzle, while the air supply pressure has a suppressive efect for them. When the water supply pressure is 0.2 MPa and the air supply pressure reaches 0.4 MPa, the nozzle obtains the smallest droplet size which is 10% smaller than the swirl pressure nozzle. Combined with the dust reduction experimental results, when the water consumption at the working surface is not limited, using the swirl pressure nozzle will achieve a better dust reduction efect. However, the internal mixing air–liquid nozzle can achieve better and more economical dust reduction performance in working environments where water consumption is limited.

关键词： Dust control Spray nozzle atomization characteristics Dust reduction performance

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