钛酸锶钡陶瓷的介电性及其在静电净油中应用
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摘要
为进一步提高静电净油技术中的非均匀电场梯度,在具有"城垛"型结构净油装置中引入钛酸锶钡电介质瓷粉,采用固相法制得微结构、电性能适于净油的Ba_(0.7)Sr_(0.3)TiO_3陶瓷,在此基础上研究了电场强度和净化时间对静电净油效果的影响。结果表明:Ba_(0.7)Sr_(0.3)TiO_3瓷粉为平均粒径为40μm,在30～40℃范围内介电常数为9000～11000,适于用作静电净油的高介无机电介质材料。Ba_(0.7)Sr_(0.3)TiO_3瓷粉的引入改善了净油环境和非均匀电场梯度,从而增强了装置对油液中Fe_2O_3的吸附,除杂率最高可达91.08%。
To further improve the non-uniform electric field gradient in electrostatic oil cleaning technology, the electrode of the electrostatic device was reformed into a "battlement" type electrode and barium strontium titanate(Ba_(1-x)Sr_xTiO_3) ceramics was introduced. The Ba_(0.7)Sr_(0.3)TiO_3 ceramic with the microstructure and electrical properties suitable for the electrostatic oil cleaning prepared by the traditional solid-phase method, and on the basis the influence of electric field strength and purification time on effect of electrostatic oil cleaning was investigated. The results show that Ba_(0.7)Sr_(0.3)TiO_3 ceramic powders have good sphericity and the average particle size is 40 μm, dielectric constant of 9000 ～ 11000 in the range of 30 ～ 40 ℃, which is suitable for the electrostatic oil cleaning as high dielectric inorganic dielectric material. The introduction of Ba_(0.7)Sr_(0.3)TiO_3 ceramics not only improves the environment of electrostatic oil cleaning but also increases nonuniform electric field gradient, which enhances the adsorption capacity of dielectric materials for impurity particles in the oil and makes impurity markedly reduce. The removal rate can be up to 91.08%.
To further improve the non-uniform electric field gradient in electrostatic oil cleaning technology, the electrode of the electrostatic device was reformed into a "battlement" type electrode and barium strontium titanate(Ba_(1-x)Sr_xTiO_3) ceramics was introduced. The Ba_(0.7)Sr_(0.3)TiO_3 ceramic with the microstructure and electrical properties suitable for the electrostatic oil cleaning prepared by the traditional solid-phase method, and on the basis the influence of electric field strength and purification time on effect of electrostatic oil cleaning was investigated. The results show that Ba_(0.7)Sr_(0.3)TiO_3 ceramic powders have good sphericity and the average particle size is 40 μm, dielectric constant of 9000 ～ 11000 in the range of 30 ～ 40 ℃, which is suitable for the electrostatic oil cleaning as high dielectric inorganic dielectric material. The introduction of Ba_(0.7)Sr_(0.3)TiO_3 ceramics not only improves the environment of electrostatic oil cleaning but also increases nonuniform electric field gradient, which enhances the adsorption capacity of dielectric materials for impurity particles in the oil and makes impurity markedly reduce. The removal rate can be up to 91.08%.
引文
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[2]Wang Y,Zheng R,Qin Y,et al.The impact of fuel compositions on the particulate emissions of direct injection gasoline engine[J].Fuel,2016,166:543-552.
[3]Kovalenko V,GALKO S,Sharykin F.Technical solutions for purifying fuels and oils at their life cycle stages[J].Chemistry&Technology of Fuels&Oils,2016,51(6):623-626.
[4]Alan H Z,Mariefel V O,Daniel M S,et al.A review and perspective of recent bio-oil hydrotreating research[J].Green Chemistry,2014,16(2):491-515.
[5]Kondrasheva N K,Kondrashev D O,Rudko V A,et al.Effect of Hydrocarbon Composition on Quality and Operating Characteristics of Middle Distillate Fractions and Low-Viscosity marine Fuels[J].Chemistry and Technology of Fuels and Oils,2017,53(2):163-172.
[6]Gascoyne P R,Vykoukal J.Particle separation by dielectrophoresis[J].Electrophores is,2015,23(13):1973-1983.
[7]Barbulovic-Nad I,Xuan X,Lee J,et al.DC-dielectrophoretic separation of microparticles using an oil droplet obstacle[J].Lab on A Chip,2006,6(2):274-279.
[8]Negr F,Cavallini A.Effect of dielectrophoretic forces on nanoparticles[J].IEEE Transactions on Dielectrics and Electrical Insulation,2017,24(3):1708-1717.
[9]Li M,Li D.Separation of Janus droplets and oil droplets in microchannels by wall-induced dielectrophoresis[J].Journal of Chromatography A,2017,1501:151-160.
[10]Mhatre S,Vivacqua V,Ghadiri M,et al.Electrostatic phase separation:A review[J].Chemical Engineering Research and Design,2015,96:177-195.
[11]张,周士瑜.静电净油用新型集尘体的研究[J].中国矿业大学学报,1995,24(4):6-10.
[12]熊常健,赵得杰,朱岳麟,等.高介电陶瓷材料在油品介电精制方法中的应用[J].功能材料,2007,38(a02):673-676.
[13]陈慧英,黄华倩,朱岳麟,等.影响加氢柴油介电精制效率的因素[J].石油炼制与化工,2009,40(7):51-54.
[14]米彦,周龙翔,张晏源,等.用于直流陡脉冲复合电场净化脏污变压器油的可循环反应器研制[J].高电压技术,2014,40(9):2714-2720.
[15]米彦,周龙翔,蒋春,等.直流陡脉冲复合电场用于变压器油净化时其脉冲波形选择[J].高电压技术,2012,38(4):941-946.
[16]郭丰昱,高荣礼,符春林,等.高效静电净化装置[P].中国专利:201720038805.4,2017-08-22.
[17]Wang X,Wu J,Dkhil B,et al.Diffuse phase transition of BST thin films in the microwave domain[J].RSC Advances,2017,7(10):5813-5820.
[18]王晓芳,岳建设.Y3+/Nb5+共掺优化锆钛钡钙基无铅压电陶瓷的电学性能[J].中国陶瓷,2018,54(04):45-50.
[19]张东,胡小冬,梅艳,等.Sr2+替代Bi3+对Bi1.5ZnN b1.5O7陶瓷介电性能的影响[J].中国陶瓷,2016,52(04):38-41.
[20]Ahmad S S,Ehsan T N,Hassan S,et al.Origin of dielectric loss in Ba(Co1/3Nb2/3)O3 microwave ceramics[J].Journal of the American Ceramic Society,2018,101(4):1665-1676.
[21]Lu D Y,Peng Y Y,Yu X Y,et al.Dielectric properties and defect chemistry of La and Tb codoped BaTiO3,ceramics[J].Journal of Alloys& Compounds,2016,681:128-138.
[22]周龙翔.直流叠加微秒脉冲电场净化脏污变压器油的初步研究[D].重庆:重庆大学硕士学位论文,2014.