scholarly journals DESIGN OF PULSED HIGH-VOLTAGE POWER FOR ELECTROSTATIC PRECIPITATOR

2018 ◽  
Vol 48 (3) ◽  
pp. 193-198
Author(s):  
L. J. FAN ◽  
X. C. PAN ◽  
Z. X. HUANG ◽  
X. D. ZU
Keyword(s):  
Physical Model ◽  
Removal Efficiency ◽  
High Voltage ◽  
Pulse Width ◽  
Electrostatic Precipitator ◽  
High Voltage Pulse ◽  
Pulse Frequency ◽  
Dust Removal ◽  
Dust Particles ◽  
The Relationship

In this paper, the physical model of anti-corona phenomenon was established, the theoretical model of anti-corona suppression powered by an electrostatic precipitator (ESP) pulse has been obtained. A dust collecting method was suggested in which a gas has ionized by an electrostatic field to adsorb dust particles to an electrode. The relationship between pulse frequency, amplitude pulse width and dust removal efficiency were tested. Research results showed that the physical model of anti-corona phenomenon could reflect the process of corona generation. The circuit scheme of superimposing high-voltage pulse based on direct current high voltage can effectively suppress the anti-corona phenomenon and improve the dust removal efficiency

scholarly journals Soot Treatment by Using High Voltage Pulse Energized Electrostatic Precipitator

2011 ◽  
Vol 9 ◽  
pp. 292-298 ◽  
Author(s):  
Nakhorn Thonglek ◽  
Chanchai Dechthummarong ◽  
Tanongkiat Kiatsiriroat
Keyword(s):  
High Voltage ◽  
Voltage Pulse ◽  
Electrostatic Precipitator ◽  
High Voltage Pulse

scholarly journals Synergistic removal of dust using the wet flue gas desulfurization systems

2019 ◽  
Vol 6 (7) ◽  
pp. 181696 ◽  
Author(s):  
Qirong Wu ◽  
Min Gu ◽  
Yungui Du ◽  
Hanxiao Zeng
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Flue Gas Desulfurization ◽  
Dust Removal ◽  
Dust Particles ◽  
Experimental Conditions ◽  
Collision Model ◽  
Sieve Tray ◽  
Spray Scrubber

Coal is still a major energy source, mostly used in power plants. However, the coal combustion emits harmful SO 2 and fly ash. Wet flue gas desulfurization (WFGD) technology is extensively used to control SO 2 emissions in power plants. However, only limited studies have investigated the synergistic dust removal by the WFGD system. Spray scrubbers and sieve-tray spray scrubbers are often used in WFGD systems to improve the SO 2 removal efficiency. In this study, the synergistic dust removal of WFGD systems for a spray scrubber and a sieve-tray spray scrubber was investigated using the experimental and modelling approaches, respectively. For the spray scrubber, the influence of parameters, including dust particle diameters and inlet concentrations of dust particles, and the flow rates of flue gas and slurry of limestone/gypsum on the dust removal efficiency, was investigated. For the sieve-tray spray scrubber, the influence of parameters such as the pore diameter and porosity of sieve trays on the dust removal efficiency was examined. The study found that the dust removal efficiency in the sieve-tray spray scrubber was approximately 1.1–10.6% higher than that of the spray scrubber for the same experimental conditions. Based on the parameters investigated and geometric parameters of a scrubber, a novel droplets swarm model for dust removal efficiency was developed from the single droplet model. The enhanced dust removal efficiency of sieve tray was expressed by introducing a strength coefficient to an inertial collision model. The dust removal efficiency model for the sieve-tray spray scrubber was developed by combining the droplets swarm model for the spray scrubber with the modified inertial collision model for the sieve tray. The results simulated using both models are consistent with the experimental data obtained.

scholarly journals Design of a High Voltage Pulse Generator with Large Width Adjusting Range for Tumor Treatment

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1053
Author(s):  
Xin Rao ◽  
Xiaodong Chen ◽  
Jun Zhou ◽  
Bo Zhang ◽  
Yasir Alfadhl
Keyword(s):  
High Voltage ◽  
Voltage Pulse ◽  
Pulse Width ◽  
Pulse Generator ◽  
Biological Effects ◽  
High Voltage Pulse ◽  
Tumor Treatment ◽  
Capacitor Array ◽  
High Voltage Pulse Generator ◽  
Voltage Pulse Generator

The unique biological effects stimulated by short pulsed electric field have many applications in tumor treatment, such as irreversible electroporation, electrochemotherapy, gene transfection and immune therapy. These biological effects require high voltage pulses with different pulse width in the range from nanoseconds to hundreds of microseconds. To fulfill this requirement, a compact high voltage pulse generator has been designed based on a switchable capacitor array and a SiC MOSFET switching array. The proposed pulse generator has one output channel with an adjustable pulse width from 100 ns to 100 µs, an amplitude range from 0 kV to 2 kV, a repetition rate less than 1.2 kHz and a voltage drop less than 5%. The mechanism of the stacked switches circuit was investigated, in connection with a switchable capacitor array. The introduction of a switchable capacitor array extends the pulse width from nanosecond scale and microsecond scale compared with other similar design methods. The pulse generator has been designed in simulation and implemented in experiment. The developed pulse generator provides a convenient and economical tool for the further studies of the unique biological effects stimulated by different pulsed electric fields for tumor treatment.

Dust Removal Using Electrode-Plates Coated with Activated Carbon

2014 ◽  
Vol 804 ◽  
pp. 85-88 ◽  
Author(s):  
Taeh Wan Jun ◽  
Hyun Chul Park ◽  
Kwang Ho Ahn ◽  
Muhammad Sajjad ◽  
Kwang Soo Kim
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Electrostatic Precipitator ◽  
Research Work ◽  
Dust Control ◽  
Dust Removal ◽  
Aluminum Electrode ◽  
Continuous Test ◽  
Removal Efficiencies ◽  
Coating Mixture

The main purpose of this research work was to evaluate dust removal efficiencies using electrode plates coated with activated carbon in dust removal chamber. The experiments were performed with electrode-plates coated with activated carbon with black carbon and poly vinyl acetate (PVA) as binding agent. Methanol was added into the coating mixture for lowering the viscosity and at the same time helped the activated carbon (AC) pores not to be blocked by PVA. After coating the electrode surface, it was tested to collect dust in cylindrical chamber with and without power supply. In both case, AC coated electrode showed higher dust removal efficiencies compared to conventional aluminum electrode. Continuous test for PM10 dust control revealed that removal efficiency gradually increased with time passage, and as increasing the distance from inlet, the removal efficiency becomes stable. However, where the interval between electrodes was as short as 1cm, and also at the back of the chamber, “back discharge” effect was observed, and resolved easily by the elevation of humidity level. Volatile organic compounds (VOCs) were controlled successfully with the AC coating material so that it proved both particular and gaseous contaminants can be treated with this AC-coated electrostatic precipitator.*Corresponding author (Kwang Soo Kim): Daehwa-Dong 283, Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do, 411-712, Korea / [email protected] / Tel. + 82 31 9100 299 / Fax. +82 31 910 0291

Research on High Frequency and High Voltage Switching Power Supply for Electrostatic Precipitator

2012 ◽  
Vol 241-244 ◽  
pp. 653-656
Author(s):  
Gu Jing Han ◽  
Jing Lei Deng ◽  
Dong Xu
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
High Frequency ◽  
Electrostatic Precipitator ◽  
Dust Removal ◽  
Switching Power Supply ◽  
Switching Power ◽  
Power Switches ◽  
Set Up ◽  
Voltage Switching

Electrostatic precipitator is the efficient dust removal equipment for environmental protection. As the core part, high voltage inverter power supply determines the efficiency and effect of dust removal. This paper design a high frequency and high voltage switching power supply for electrostatic precipitator based on FPGA. The power supply system is composed of rectifier and filter circuit, high frequency inverter circuit, step-up transformer and high voltage rectifier silicon reactor circuit. Using IRFP460N as power switches, single-phase full-bridge inverter was set up. The SPWM signals produced by FPGA EP2C5T144C8 were isolated and amplified through drive circuit IR2110. The function of variable frequency and voltage was realized. Hardware test showed the whole system operated safely and reliably.

Dust Reduction Efficiency of a Single-Row Vegetative Barrier (Maclura pomifera)

2018 ◽  
Vol 61 (6) ◽  
pp. 1907-1914
Author(s):  
Howell B. Gonzales ◽  
John Tatarko ◽  
Mark E. Casada ◽  
Ronaldo G. Maghirang ◽  
Lawrence J. Hagen ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Great Plains ◽  
Wind Erosion ◽  
Dust Removal ◽  
Dust Particles ◽  
Deciduous Tree ◽  
Single Row ◽  
Osage Orange ◽  
Reduction Efficiency ◽  
Dust Reduction

Little is known about the dust removal efficiency of common vegetative barriers. This study of blowing dust reduction was conducted on one of the most common vegetative barriers used for wind erosion control in Kansas and the U.S. Great Plains, the deciduous tree species (Osage orange). A dust generator and distributor were fabricated to generate dust particles for determining the dust removal efficiency of a single-row Osage orange barrier. Simultaneous upwind and downwind dust concentrations were measured using mini-vol samplers for total suspended particulates (TSP) at heights of 1.5, 3.0, 4.5, and 6.0 m above the ground. Measurements were made using two towers located at upwind and downwind distances equal to the height of the barrier. Particle size distribution (PSD) analysis of the initial generated dust showed that most particles were large (GMD = 102.8 µm), while about 5% of the dust was particulate matter less than 2.5 µm in diameter (PM2.5) and 15% was less than 10 µm (PM10). Laser diffraction analysis of particles from the sample filters was used to determine the dust reduction efficiency of the barrier. Results showed that dust reduction was significantly related to reduction in wind speed at lower heights, causing an overall decrease in dust concentration as particles passed through the barrier. Concentrations of larger particles (~100 µm) were also reduced relative to smaller particles when dust passed through the barrier. The data also showed that 4.5 m above the ground, near the crown of the canopy, was most efficient at removing the PM2.5 (15% to 54%) and PM10 (23% to 65%) fractions of the generated dust. Keywords: Generated dust, Osage orange, PM2.5, PM10, TSP, Wind erosion.

High voltage pulse gated power supply with adjustable pulse width

2017 ◽  
Author(s):  
Yang Yu ◽  
Yuanhe Tang ◽  
Shulin Liu ◽  
Baojun Yan ◽  
Yuzhen Yang ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Voltage Pulse ◽  
Pulse Width ◽  
High Voltage Pulse

Analysis of the Relationship between Electrostatic Dust Removal Efficiency and its Factors in Coal-Fired Power Plant

2013 ◽  
Vol 807-809 ◽  
pp. 1417-1421
Author(s):  
Zhen Li ◽  
Chen Yu Cao ◽  
Jian Xing Ren
Keyword(s):  
Power Plant ◽  
Removal Efficiency ◽  
Influential Factors ◽  
Dust Removal ◽  
Environmental Standards ◽  
New Challenges ◽  
Electrostatic Precipitators ◽  
The Relationship ◽  
National Environmental

With the national environmental standards becoming more and more strict, electrostatic precipitators is facing the new challenges, promoting the efficiency further and reducing emissions are essential to achieve the environmental standards. This paper analyzed the influential factors of the dust removal efficiency of electrostatic precipitators in coal-fired units, and discussed the relationship between dust removal efficiency and its factors, which lay the foundation for improving the dust removal efficiency.

Sign in / Sign up

Export Citation Format

Share Document