• Title/Summary/Keyword: $NO_x$ removal

Search Result 251, Processing Time 0.028 seconds

Analysis on NOX Removal Efficiencies and Particle Growth Using Pulsed Corona Discharge Reactor (펄스 코로나 방전 반응기를 이용한 NOX 제거 효율 및 입자 성장 분석)

  • Park, Jung-Hwan;Kim, Dong-Joo;Kim, Kyo-Seon
    • Journal of Industrial Technology
    • /
    • v.21 no.B
    • /
    • pp.155-161
    • /
    • 2001
  • In this study, we analyzed the $NO_X$ removal efficiency and particle size distribution by the pulsed corona discharge process and investigated the effect of several process variables. The NO removal efficiencies and the particle characteristics were measured and analyzed as the function of initial concentrations of NO, $H_2O$, and $NH_3$, applied voltage, pulse frequency and residence time. As the frequency of applied voltage increases, or as the applied voltage increases or as the residence time increases, the NO removal efficiency increases. The change of initial $NH_3$ and $H_2O$ concentrations do not affect the NO removal efficiency significantly. The particle concentration and size increases with the increases of initial NO concentration, residence time and applied voltage.

  • PDF

Effect of Process Variables on NOx Removal by Low Temperature Plasma Process (저온 플라즈마 공정에 의한 NOx 제거시 공정 변수의 영향)

  • Park, Jung-Hwan;Kim, Dong-Joo;Kim, Kyo-Seon
    • Journal of Industrial Technology
    • /
    • v.21 no.A
    • /
    • pp.279-284
    • /
    • 2001
  • In this study, we analyzed the $NO_X$ removal effiency by the low temperature plasma process and investigated the effect of several process variables. Most of NO is converted into $NO_2$ and, later, into $HNO_3$ which reacts with $NH_3$ to form $NH_4NO_3$ particles. As the frequency of appling voltage increases, as the applied voltage increases or as the residential time increases, removal efficiency of the NO supplied initially increase. The removal efficiency of $NO_X$ also increases with the increase of $NH_3$ supplied.

  • PDF

Experimental Analysis on the Desulfurizarion and Denitrification Efficiencies in Pulsed Corona Discharge Process (펄스 코로나 방전 공정에서 탈질, 탈황 효율의 실험적 분석)

  • Kim, Sung-Min;Kim, Kyo-Seon
    • Journal of Industrial Technology
    • /
    • v.23 no.A
    • /
    • pp.181-186
    • /
    • 2003
  • In this study, we analyzed $NO_x$ and $SO_x$ removal efficiencies by a pulsed corona discharge process and investigated the effect of several process variables. The removal efficiencies of NO and $SO_2$ were measured changing the process variables of initial concentrations of NO, $H_2O$, and $NH_3$, $SO_2$, applied voltage, pulse frequency and residence time. As the applied voltage or the frequency of applied voltage or the residence time increases, the NO and $SO_2$ removal efficiencies increase. The NO and $SO_2$ removal efficiencies also increase by the addition of $O_2$ or $H_2O$, or by using the large diameter of the discharge electrode. The experimental results can be used as a basis to design the pulsed corona discharge process to remove $NO_x$, $SO_x$ and VOCs.

  • PDF

A Study on the NOx Removal Rate by Arrangement of Discharge Electrode in Pulsed Corona Discharge Reactor (펄스 코로나 반응기에서 방전극의 배열에 따른 탈질율 연구)

  • Choi, Min;Park, So-Jin;Wi, Young-Ho
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.19 no.3
    • /
    • pp.315-323
    • /
    • 2003
  • The goal of this study if the optimization of discharge electrode for pulsed corona discharge reactor located in thermal power plant. For this purpose, we have performed experiments of NO$_{x}$ removal rate by exchange of discharge electrode diameter and arrangement of discharge electrode in the non -thermal plasma reaction facility using a ethylene as additive. If the diameter and numbers of discharge electrode were larger, the NO$_{x}$ removal rate was higher. From these results, if we optimized the shape and installed numbers of discharge electrode at the pilot plant, we could increase the NO$_{x}$ removal rate with less amount of additive than current amount.mount.

Simultaneous removal of $SO_X$ and $NO_X$ by wet scrubber at small and medium craft (중소형 선박의 $SO_X/NO_X$ 동시제거를 위한 습식세정시스템)

  • Cha, Yu-Joung;Lee, Ju-Yeol;Ha, Tae-Young;Park, Byung-Hyun
    • Journal of the Korean Applied Science and Technology
    • /
    • v.31 no.1
    • /
    • pp.159-166
    • /
    • 2014
  • In recent years, researchers have put a considerable effort to decrease the emission of harmful gaseous pollutants to the atmosphere. In order to remove simultaneously $SO_2$ and $NO_X$ from the flue gas of small and medium-sized ship, we designed minimal wet scrubber inside a compact multistage modular system. In this study we proceed experiment of elemental technology at each stage of the scrubber. The each stage is oxidation of NO which is the main component of $NO_X$, and removal of $SO_2$, respectively. $NaClO_2$ was used to oxidize NO gas, and NaOH was used to remove $SO_2$ gas. The maximum NO conversion efficiency and the $SO_2$ removal efficiency are both indicate 100%.

The effect of Pellet about $DeNO_x$ for Packed-bed type reactor (Packed-bed type 반응기에서 $NO_x$제거에 대한 Pellet의 영향)

  • Park, Jae-Yoon;Lee, Kyunh-Ho;Lee, Dong-Hoon;Kim, Jung-Dal;Park, Sang-Hyun;Koh, Hee-Suk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2000.05b
    • /
    • pp.203-206
    • /
    • 2000
  • In this experiment, an attempt to use pellets($BaTiO_3$, $TiO_2$, ${\gamma}-Al_2O_3$, sludge) for $NO_x$ removal was conducted The effect of pellets on NO removal from simulated flue gas was experimentally investigated for packed-bed reactor of plate-plate geometry. An experimental investigation has been conducted for NO concentration of 50ppm balanced by air, and gas flow rate of $5{\ell}/min$. Ceramic pellets were used for surface discharge and the sludge pellets was added on $BaTiO_3$ and $TiO_2$ to increase $NO_x$ removal rate. In the result, $NO_x$ removal rate using $TiO_2$ was better than other pellets. $NO_2$ segnificatly generated by using $BaTiO_3$ pellets and sludge pellets used with $BaTiO_3$ decreased $NO_2$ generation.

  • PDF

NO Removal Efficiency by Pulsed Corona Discharge Process at Room Temperature (상온 펄스 코로나 방전 공정에 의한 NO 제거 효율)

  • 김동주;박정환;김교선
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.18 no.5
    • /
    • pp.337-344
    • /
    • 2002
  • In this study, we analyzed the NO removal efficiency by the pulsed corona discharge process and investigated the effects of several process variables such as initial concentrations of NO, $H_2O$, and NH$_3$, applied voltage, pulse frequency, diameter of the discharge electrode, and residence time. The removal efficiency of NO increased by the addition of $H_2O$ or NH$_3$, but the changes of initial NH$_3$ and $H_2O$ concentrations did not affect the removal efficiency of NO significantly. With the increases of the applied voltage or the residence time, the removal efficiency of NO increased. In addition, with the increases of the pulse frequency of applied voltage, or the diameter of the discharge electrode, the removal efficiency of NO increased. The experimental results can be used as a basis to design the pulsed corona discharge process to remove NO$_{x}$, SO$_{x}$ and VOCs.OCs.

Effect of Sludge Pellets on $NO_x$ REmoval in $BaTiO_3$-sludge Packed-bed Reactor ($BaTiO_3$-슬러지 Packed-bed형 반응기에서 $NO_x$제거에 미치는 슬러지의 영향)

  • 박재윤;송원섭;고희석;박상현
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.14 no.10
    • /
    • pp.861-867
    • /
    • 2001
  • In this paper, in order to investigate the catalytic effect of the sludge exhausted from waterworks on NO$_{x}$ removal, we measure NO removal characteristics with and without sludge pellets in BaTiO$_3$-sludge packed-bed reactor of plate-plate geometry. NO initial concentration is 50 ppm balanced with air and a gas flow rate is 5ι/min. Gas temperature is changed from 25 to 10$0^{\circ}C$ to investigate the role of sludge pellet on removing active oxygen species and NO$_2$. BaTiO$_3$pellets is filled for coronal discharge at upstream of reactor and sludge pellets is filled for catalytic effect at downstream of reactor. The volume percent of sludge pellets to BaTiO$_3$pellets is changed from 0% to 100% and AC voltage is supplied to the reactor for discharging simulated gases. In the results, when sludge pellets is put at the downstream of plasma reactor, NO removal rate is slightly increased. However, NO$_2$and $O_3$ as by-products during NO removal is significantly decreased from 51ppm without sludge pellets to 5 ppm with sludge pellets and from 50 ppm without sludge pellets to 0.004ppm with sludge pellets, respectively. Therefore, NO$_{x}$(NO+NO$_2$) removal rate is increased up to 93%. It is thought that sludge pellet maybe react with active oxygen species and NO$_2$ generated by corona discharge in surface of BaTiO$_3$pellets, the then NO$_2$O$_3$as by-products are considerably decreased. When we increase gas temperature from room temperature to 10$0^{\circ}C$, NO removal rate is decreased, while NO$_2$ concentration is independent on gas temperature. These result suggest that the removal mechanism of active oxygen species and NO$_2$in sludge pellet is not absorption, but chemical reaction. Therefore we expect that sludge pellets exhausted for waterworks could be used as catalyst for NO$_{x}$ removal with high removal rate and low by-product.oduct.

  • PDF

Generation Characteristics of Ozone and NOx and Particle Removal in the Electrostatic Precipitators (코로나 방전 방식에 따른 전기집진기의 오존, NOx 발생 및 입자제거 특성)

  • Noh, Kwang-Chul;Lee, Young-Ho;Oh, Myung-Do
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.27 no.10
    • /
    • pp.1442-1449
    • /
    • 2003
  • We investigated the amount of the toxic gases emitted from the Electrostatic Precipitators(ESPs), which are currently used as the indoor air cleaners. The existing wire-to-plate(WTP) and neddle-to-plate(NTP) types of ESP designs are considered as the experimental corona dischargers. Using the voltage, the polarity of wire, the number of needles of NTP as the input variables, we studied the generation characteristics of ozone and $NO_{x}$ and the particle removal efficiency in the ESPs. As the results, we found out that the concentration of ozone, $NO_{2}$ and $NO_{x}$ is increased with increasing the voltage and the number of needles, but the amount of NO is decreased. And we observed that the generation rates of ozone and $NO_{x}$ are mainly related with the corona region through the photographs. Finally the experimental results showed that the particle removal efficiency of ESP with WTP type charger is more superior to that with NTP type chargers at the same voltage.

Simultaneous Removal of NO and SO2 using Microbubble and Reducing Agent (마이크로버블과 환원제를 이용한 습식 NO 및 SO2의 동시제거)

  • Song, Dong Hun;Kang, Jo Hong;Park, Hyun Sic;Song, Hojun;Chung, Yongchul G.
    • Clean Technology
    • /
    • v.27 no.4
    • /
    • pp.341-349
    • /
    • 2021
  • In combustion facilities, the nitrogen and sulfur in fossil fuels react with oxygen to generate air pollutants such as nitrogen oxides (NOX) and sulfur oxides (SOX), which are harmful to the human body and cause environmental pollution. There are regulations worldwide to reduce NOX and SOX, and various technologies are being applied to meet these regulations. There are commercialized methods to reduce NOX and SOX emissions such as selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and wet flue gas desulfurization (WFGD), but due to the disadvantages of these methods, many studies have been conducted to simultaneously remove NOX and SOX. However, even in the NOX and SOX simultaneous removal methods, there are problems with wastewater generation due to oxidants and absorbents, costs incurred due to the use of catalysts and electrolysis to activate specific oxidants, and the harmfulness of gas oxidants themselves. Therefore, in this research, microbubbles generated in a high-pressure disperser and reducing agents were used to reduce costs and facilitate wastewater treatment in order to compensate for the shortcomings of the NOX, SOX simultaneous treatment method. It was confirmed through image processing and ESR (electron spin resonance) analysis that the disperser generates real microbubbles. NOX and SOX removal tests according to temperature were also conducted using only microbubbles. In addition, the removal efficiencies of NOX and SOX are about 75% and 99% using a reducing agent and microbubbles to reduce wastewater. When a small amount of oxidizing agent was added to this microbubble system, both NOX and SOX removal rates achieved 99% or more. Based on these findings, it is expected that this suggested method will contribute to solving the cost and environmental problems associated with the wet oxidation removal method.