An experimental-scale electrostatic precipitator was built to investigate the characteristics of corona discharge and particle collection at various temperatures ranging from 90℃ to 450℃. The influence of several key parameters(temperature, applied voltage, particle concentration and gas flow velocity) on particle collection efficiency were analyzed, and the results indicate that the collection efficiency can reach higher than 98% as the gas temperature increases form 90℃ to 450℃, when the specific collection area(SCA) of the ESP is 46.5m2/(m3·s-1) and the inlet mass concentration of particles is about 750mg/Nm3.The collection efficiency increases with the increase of applied voltage, yet the growth rate reduces gradually. At the same voltage, as the temperature increases, the corona current increases substantially, which enhances the particle charging and finally improves the collection efficiency. However, at the same corona current, the particle collection efficiency decreases because of the low electric field intensity at high temperature. The increase in gas flow velocity reduces the particle collection efficiency, and the influence of gas flow velocity on PM1.0 removal is much more significant than PM10. The increase in particle concentration enhances the collisions among particles and leads to particle coagulation, which is conducive to particle removal.
Minchener A J. Gasification based CCS challenges and opportunities for China[J]. Fuel, 2014,116:904-909.
[2]
Li D, Cheng Y. Evaluation of Gas Control Ability of a Coal and Gas Outburst Mine[J]. Energy Sources Part a-Recovery Utilization and Environmental Effects, 2014,36(21):2401-2409.
[3]
Hu J J, Lei T Z, Wang Z W, et al. Economic, environmental and social assessment of briquette fuel from agricultural residues in China-A study on flat die briquetting using corn stalk[J]. Energy, 2014,64:557-566.
Bush J R, Feldman P L, Robinson M. High temperature, high pressure electrostatic precipitation[J]. Journal of the Air Pollution Control Association, 1979,29(4):365-371.
[8]
Shin M S, Kim H S, Jang D S, et al. A numerical and experimental study on a high efficiency cyclone dust separator for high temperature and pressurized environments[J]. Applied Thermal Engineering, 2005,25(11/12):1821-1835.
[9]
Xiao G, Wang X H, Zhang J P, et al. Granular bed filter:A promising technology for hot gas clean-up[J]. Powder Technology, 2013,244:93-99.
[10]
Lee K S, Sohn J R, Park Y O. Filtration performance characteristics of ceramic candle filter based on inlet structure of high-temperature and high-pressure dust collectors[J]. Journal of Industrial and Engineering Chemistry, 2015,21:101-110.
[11]
Heidenreich S. Hot gas filtration-A review[J]. Fuel, 2013,104:83-94.
[12]
Walker A B. Hot-Side Precipitators[J]. Journal of the Air Pollution Control Association, 1975,25(2):143-145.
[13]
Fulyful F K. High Temperature-High Pressure Effect on Performance of an Electrostatic precipitator[J]. journal of kerbala university, 2008,6(2):84-92.
[14]
Villot A, Gonthier Y, Gonze E, et al. Separation of particles from syngas at high-temperatures with an electrostatic precipitator[J]. Separation and Purification Technology, 2012,92:181-190.
[15]
Noda N, Makino H. Influence of operating temperature on performance of electrostatic precipitator for pulverized coal combustion boiler[J]. Advanced Powder Technology, 2010,21(4):495-499.
[16]
Xiao G, Wang X, Yang G, et al. An experimental investigation of electrostatic precipitation in a wire-cylinder configuration at high temperatures[J]. Powder Technology, 2015,269:166-177.
Thomas J B, Wong E. Experimental study of dc corona at high temperatures and pressures[J]. Journal of Applied Physics, 1958, 29(8):1226.
[20]
Rinard G R, Donald E, Yamamoto Toshiaki. High-temperature high-pressure electrostatic precipitator electrical characterization and collection efficiency[J]. IEEE Transactions on Industry Applications, 1987,(1):114-119.
[21]
Reijnen K, Vanbrakel J. Gas cleaning at high-temperatures and high-pressures:A review[J]. Powder Technology, 1984,40(1-3):81-111.
[22]
Xu J J, Gu Z Z, Zhang J. Experimental study on fly ash resistivity at temperatures above 673K[J]. Fuel, 2014,116:650-654.
Wang X H, You C F. Effects of thermophoresis, vapor, and water film on particle removal of electrostatic precipitator[J]. Journal of Aerosol Science, 2013,63:1-9.
[26]
Long Z W, Yao Q A. Evaluation of various particle charging models for simulating particle dynamics in electrostatic precipitators[J]. Journal of Aerosol Science, 2010,41(7):702-718.
[27]
Mizuno A. Electrostatic Precipitation[J]. IEEE Transactionson Dielectricsand Electrical Insulation, 2000,7:615-624.
[28]
You C, Wang X, Liu R, et al. Simultaneous effects of electrostatic field and thermophoresis on inhalable particulate matter removal[J]. Powder Technology, 2010,202(1-3):95-100.
[29]
武占成,张希军.气体放电[M]. 北京:国防工业出版社, 2012.
[30]
Abdel-Salam M, Nakano M, Mizuno A. Corona-induced pressures, potentials, fields and currents in electrostatic precipitator configurations[J]. Journal of Physics D-Applied Physics, 2007,40(7):1919-1926.
[31]
Zhang J P, Zhou A X, Du Y Y, et al. Influences of gas velocity and particle distribution on PM10 collection in wire-plate ESP under diffusion charging mechanisms[C]//Li H, Xu Q, Ge H. Environmental Engineering, Pts 1-4, 2014:1399-1407.
[32]
Podlinski J, Niewulis A, Mizeraczyk J, et al. ESP performance for various dust densities[J]. Journal of Electrostatics, 2008,66(5/6):246-253.