Characteristics of DC discharge in a wire-cylinder configuration at high ambient temperatures

Characteristics of negative DC discharge in a wire–cylinder configuration under coal pyrolysis gas components at high temperatures

“…At 350 C and on the port , and the required electron energy is 0.058 eV; 15,21 in CO 2 , its molecules attach electrons through a two-step reaction (shown in eqn (7)), and the required electron energy is 3.85 eV. 15,20 Gas molecules with high electronegativity (low required electron energy in the attachment reactions) can attach additional electrons at the dri region, thereby reducing the mean velocity of charges and the discharge current. 3.2.2 Comparison of electronegative gas media and nonelectronegative gas media.…”

“…When electrons collide with gas molecules, some gas molecules can attach electrons to form negative ions, and these kinds of gas are referred as electronegative gas media, like air and CO 2 . 10,15 Other kinds of gas which cannot attach electrons, are referred as nonelectronegative gas media, like H 2 , N 2 and CH 4 . 10,15,23 The V-I characteristics of a wire-cylinder conguration under CO 2 gas medium at different temperatures are shown in Fig.…”

“…Corona discharge is a fundamental process for ESP, because the ions produced in this process play an important role in particle charging, thereby affecting particle collection efficiency. [7][8][9][10][11][12][13][14] Xiao 15 studied the characteristics of DC negative corona discharge in a wire-cylinder conguration at an ambient temperature range of 350-850 C and concluded that the ratio of the electron current to the total discharging current increases with increasing temperature. Because of the electron current, the maximum collection efficiency decreases and energy consumption increases as temperature increases.…”

“…In addition to temperature and discharge device structure, gas media are also an important factor affecting the discharge characteristics. Wang 15,17 studied the discharge characteristics at high temperatures in the atmosphere of O 2 , CO 2 , and N 2 and concluded that the discharge current in the mixture of CO 2 and N 2 gas media increases when the content of CO 2 increases.…”

High Temperature Electrical Charger to Reduce Particulate Emissions from Small Biomass-Fired Boilers

“…Currently, the factors affecting the high-temperature charging of flue gases are not well understood. Generally, the limitation for a hightemperature ESP is the lower stability of the corona discharge due to the high kinetic energy of the gas molecules [25,26]. Furthermore, the residence time for particle charging is lower in the SCC than in the ESP.…”