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Effect of photovoltaic panel electric field on the wind speed required for dust removal from the panels

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Chinese Physics B 2023年第8期32卷 296-303页

作者：李兴财王娟刘滢格马鑫 Ningxia Key Laboratory of Desert Information&Intelligent Sensing School of PhysicsElectronic and Electrical EngineeringNingxia UniversityYinchuan 750021China Key Laboratory of Mechanics on Disaster and Environment in Western China the Ministry of EducationLanzhou UniversityLanzhou 730000China Xinhua College of Ningxia University Yinchuan 750021China

Methods to remove dust deposits by high-speed airflow have significant potential applications,with optimal design of flow velocity being the core *** this paper,we discuss the wind speed required for particle removal from photovoltaic(PV)panels by compressed air by analyzing the force exerted on the dust deposited on inclined photovoltaic panels,which also included different electrification mechanisms of dust while it is in contact with the PV *** results show that the effect of the particle charging mechanism in the electric field generated by the PV panel is greatly smaller than the effect of the Van der Waals force and gravity,but the effect of the particle charged by the contact electrification mechanism in the electrostatic field is very *** wind speed required for dust removal from the PV panel increases linearly with the PV panel electric field,so we suggest that the nighttime,when the PV electric field is relatively small,would be more appropriate time for dust *** above results are of great scientific importance for accurately grasping the dust distribution law and for achieving scientific removal of dust on PV panels.

关键词： photovoltaic power generation dust removal electrostatic force required wind speed contact electrification

Mechanism of dust removal by a standing wave electric curtain

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Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 1018-1025页

作者： SUN QiXia YANG NingNing CAI XiaoBing HU GengKai School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

In this paper,the mechanisms of particle movement on an electric curtain are *** bursts in which particles leaping from a surface of an electric curtain are demonstrated both by numerical simulation and experimental *** hopping and surfing modes during particle removal are shown to depend on the particle electric charge and its initial *** particles initially located on the top of electrode have a large electric charge tend to assume a hopping *** movement of the particle initially located between the electrodes is analyzed,and the particle traps along the electric curtain surface are also observed.

关键词： electrical curtain dust removal dielectrophoresis force particle dynamic simulation

Experimental study of the dust-removal performance of a wet scrubber

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International Journal of Coal Science & Technology 2021年第2期8卷 228-239页

作者： Shengyong Hu Yang Gao Guorui Feng Fei Hu Changhe Liu Jihua Li College of Safety and Emergency Management Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Green Mining Engineering Technology Research Center of Shanxi Province Taiyuan 030024ShanxiChina Shandong New Sunshine Environmental Protection Equipment Co. Ltd.Zoucheng 273500ShandongChina

A variety of dust control methods are often applied in coal mines,among which the application of wet scrubbers has proven to be an efficient technology for the removal of dust in airstreams,rather than diluting or confining the *** this paper,a wet scrubber design was *** on a self-designed experimental test platform,the total dust concentration,respirable dust concentration,air volume,and average pressure drops of wet scrubbers with 12,16,20,and 24 blades were measured under different water intake *** results show that the different water intake levels have only minimal effects on the air volume of the wet ***,increased water intake had improved the dust removal efficiency of the wet scrubbers with the same number of *** wet scrubber with 16 blades was found to have the best dust removal efficiency at a water intake level of 1.35 m^(3)/*** total dust and respirable dust removal efficiency reached 96.81%and 95.59%,*** air volume was 200.4 m^(3)/min,and the average pressure drop was determined to be 169.4 *** addition,when the wet scrubber with 16 blades was applied in a coal preparation plant in China's Shanxi Province,it was observed that the total dust concentration had fallen below 8.1 mg/m^(3),and the respirable dust concentration had fallen below 5.9 mg/m^(3).Therefore,the results obtained in this research investigation provide important references for the use of wet scrubbers to improve coal production environmental conditions.

关键词： Coal mine Coal dust dust removal Performance of wet scrubber

removal of dust from flue gas in magnetically stabilized fluidized bed

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Particuology 2008年第2期6卷 116-119页

作者： Yinghui Wang Keting Gui Mingheng Shi Changfeng Li School of Energy and Power Engineering Jiangsu University Zhenjiang 212013 Jiangsu China Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education Southeast University Nanjing 210096 Jiangsu China

A magnetically stabilized fluidized bed （MSFB,Ф 500mm×2100mm） was designed to study dust removal from flue gas. Based on the mechanism of dust removal in a fixed bed, the effects on collection efficiency of magnetic field intensity, ratio of flue gas velocity to minimum fluidization velocity, bed height, and particle average diameter, were investigated. Then feasible methods for MSFB to better remove dust were proposed. Over 95 % of dust removal with MSFB can be achieved, when stable fluidization is maintained and when magnetic particles are frequently renewed.

关键词： Magnetically stabilized fluidized bed (MSFB) Stable fluidization dust removal Magnetic particles renewal

Numerical simulation and experimental study of gas cyclone–liquid jet separator for fine particle separation

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Chinese Journal of Chemical Engineering 2022年第11期51卷 43-52页

作者： Liwang Wang Erwen Chen Liang Ma Zhanghuang Yang Zongzhe Li Weihui Yang Hualin Wang Yulong Chang School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China College of Architecture and Environment Sichuan UniversityChengdu 610065China

To address the shortcomings of existing particulate matter trapping technology,especially the low separation efficiency of fine particles,herein,a novel gas cyclone-liquid jet separator was developed to research fine particle ***,numerical simulation methods were used to investigate the flow field characteristics and dust removal efficiency of the separator under different working conditions,and to determined suitable experimental conditions for subsequent dust removal ***,the separation efficiency of the separator against five kinds of common particles,including g-C_(3)N_(4),TiO_(2),SiC,talc,and SiO_(2),was experimentally studied.A maximum separation efficiency of 99.48%was achieved for particles larger than 13.1μm,and 96.55%efficiency was achieved for particles larger than 2μ*** best crushing atomization effect was achieved for the separator when uGwas 10 m·s^(-1)and uLwas 3 m·s^(-1),while the best separation effect was achieved when uGwas 10 m·s^(-1)and uLwas 3.75 m·s^(-1).Studies have shown that the gas cyclone-liquid jet separator has excellent applicability in the separation of fine particles.

关键词： Gas cyclone-liquid jet dust removal Fine particles Numerical simulation

Experimental study on filtering mixed solid-liquid dust with a sliding granular bed filter

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Particuology 2021年第5期19卷 16-25页

作者： Yankai Peng Chuanping Liu Li Wang Shaowu Yin Lige Tong Zeyi Jiang School of Energy and Environment Engineering University of Science and Technology BeijingChina Beijing Engineering Research Centre of Energy Saving and Environmental Protection China

The filtration of mixed dust that included a small number of melted(liquid)particles was studied in an experimental granular bed filter(GBF).Results show that the collection efficiency of dust containing melted particles is higher than that of dust composed of solid particles but the pressure drop from the former is higher than that of the *** collection efficiency and pressure drop increase as the concentration of melted particles increases.A surface sliding GBF exhibits good comprehensive performance when filtering dust,especially dust containing a mix of solid and liquid *** effects of the gas temperature,gas velocity,sliding filter bed thickness,and sliding collector flux on filter performance were also *** on the experimental results,correlations for the collection efficiency and pressure drop for mixed dust are presented.

关键词： Melted particle dust removal Granular bed filter Hot gas

Simulation of aggregation effects on co-fired biomass-coal ash in an electrostatic precipitator

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Particuology 2020年第3期18卷 120-126页

作者： Jianyi Lu Zhe Yang Bingyi Xu Zhiyong Zhou Chenxi Sun MOE Key Laboratory of Resources and Environmental Systems Optimization Beijing 102206China School of Environment Science and Engineering North China Electric Power UniversityBaoding 071003China

Aggregation of fine ash into larger particles benefits fly ash removal in an electrostatic *** aggregation,turbulent aggregation,and electrical aggregation of fine ash (derived from co-firing of biomass fuel and anthracite coal) was simulated under different conditions in an electrostatic precipitator.A population balance model and user-defined function in Fluent were assumed to obtain aggregation kernel functions and calculate the aggregation effects on the co-combusted *** results show that electrical aggregation had an obvious effect on both micron-and submicron-sized *** submicron particles,the effect of thermal aggregation is about ten times greater than turbulent ***,for micron-sized particles,turbulent aggregation is about seven times greater than thermal ***,particle aggregation in the electrostatic precipitator mainly occurs because of electrical aggregation,supplemented by thermal aggregation and turbulent *** the flow velocity is 1.0 m/s,particle volume fraction is 1.4%,and biomass co-firing ratio is 10%,the effects of all three aggregation processes on ash particles are optimized.

关键词： Co-combustion Aggregation Population balance model(PBM) dust removal Electrostatic precipitator(ESP)

Design and Development of a High Efficiency Carbon- Granular Bed Filter in Industrial Scale

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Chinese Journal of Chemical Engineering 2004年第3期12卷 395-400页

作者：张济宇旷戈林诚 Institute of Chemical Engineering and Technology Fuzhou University Fuzhou 350002 China Institute of Chemical Engineering and Technology Fuzhou University Fuzhou 350002 Chinahe new dust removal technical route using the carbon-granular bed filter packed of carbon particles with appropriate grade derive from an online-process vibration sieve to replace the traditional baggy filter had been developed successfully for capturing the micro-carbon dusts produced from pulverization of petroleum coke and the green close loop of carbon materials is thus completed in the combined pulverizing and classifying system and pulverized carbon dust removal process. The high dust removal efficiency greater than 99% low outlet dust concentration less than 100mg.m-3 low pressure drop through dust filtration chamber less than 980Pa simple and easy design and flexible and stable operation were achieved also with the carbon-granular bed filter in both bench and industrial scale operations.

The new dust removal technical route using the carbon-granular bed filter, packed of carbon particles with appropriate grade derive from an online-process vibration sieve, to replace the traditional baggy filter had been developed successfully for capturing the micro-carbon dusts produced from pulverization of petroleum coke, and the green close loop of carbon materials is thus completed in the combined pulverizing and classifying system and pulverized carbon dust removal process. The high dust removal efficiency greater than 99%, low outlet dust concentration less than 100mg·m-3, low pressure drop through dust filtration chamber less than 980Pa, simple and easy design, and flexible and stable operation were achieved also with the carbon-granular bed filter in both bench and industrial scale operations.

关键词： carbon-granular bed dust removal outlet dust concentration pressure drop

Blue-coke production technology and the current state-of-the-art in China

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Carbon Resources Conversion 2020年第1期3卷 82-94页

作者： Yanchun Feng Shaoping Xu State Key Laboratory of Fine Chemicals Institute of Coal Chemical EngineeringSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China College of Chemistry and Chemical Engineering Inner Mongolia University for the NationalitiesTongliao 028000China

Blue-coke is a kind of char obtained by the low temperature pyrolysis of non-caking or weakly-caking coal with high volatile *** is generally granular with high reactivity,high electrical resistivity and high in fixed carbon but low in ash,sulfur,aluminum and phosphorus *** has low price and extensive application decided by the raw coal and the production *** paper reviews pyrolysis reactor,process principle,technology characteristic and application state of blue-coke production technology in *** includes vertical oven technology,rotary kiln technology and rotary-hearth furnace technology with external-heating,and vertical oven technology,rotary-disc furnace technology and conveyor-belt furnace technology with *** to the existing problems in industrial blue-coke production technology,perspectives in terms of dust removal from volatiles,coke quenching and breakthrough of pyrolysis technology are given.

关键词： Blue-coke Pyrolysis reactor Production technology Low temperature pyrolysis dust removal Coke quenching