• Title, Summary, Keyword: $NO_x$ removal

Search Result 223, Processing Time 0.039 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

Photocatalytic removal of NOx using TiO2-coated zeolite

  • Mendoza, Joseph Albert;Lee, Dong Hoon;Kang, Joo-Hyon
    • Environmental Engineering Research
    • /
    • v.21 no.3
    • /
    • pp.291-296
    • /
    • 2016
  • Application of photocatalytic nanoparticles has been recently gaining an increased attention as air purifying material for sustainable urban development. The present work reports the photocatalytic removal of gaseous phase nitrogen oxides ($NO_x$) using $TiO_2$-coated zeolite to be applied as a filter media for the urban green infrastructure such as raingardens. The $TiO_2$-coated zeolite was synthesized by simple wet chemistry method and tested in a continuous-flow photo-reactor for its removal efficiency of $NO_x$ under different conditions of the weight percentage of $TiO_2$ coated on the zeolite, and gas retention time. The removal efficiency of $NO_x$ in general increased as the weight percentage of $TiO_2$ coated on the zeolite increased up to 15-20%. Greater than 90% of $NO_x$ was removed at a retention time of one minute using the $TiO_2$-coated zeolite ($TiO_2$ weight percentage = 20%). Overall, $TiO_2$-coated zeolite showed greater efficiency of $NO_x$ removal compared to $TiO_2$ powder probably by providing additional reaction sites from the porous structure of zeolite. It was presumed that the degradation of $NO_x$ is attributed to both the physical adsorption and photocatalytic oxidation that could simultaneously occur at the catalyst surface.

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.

NH3-based SNCR of NOx : Experimental and Simulation (NH3 SNCR을 이용한 NOx 제거 : 실험 및 모사)

  • Cha, Jin Sun;Park, Sung Hoon;Jeon, Jong-Ki;Park, Young-Kwon
    • Applied Chemistry for Engineering
    • /
    • v.22 no.4
    • /
    • pp.433-438
    • /
    • 2011
  • In this study, effects of temperature, NSR, and oxygen concentration on the $NO_x$ removal efficiency of an SNCR process were investigated experimentally as well as numerically using CHEMKIN-II program. The NO removal efficiency increased with the reactor temperature under oxygen-free condition, whereas when the oxygen concentration was 4%, the NO removal efficiency showed a maximum value at $900{\sim}950^{\circ}C$. The pressure of oxygen was shown to enhance the NO removal at low temperature. Regardless of the oxygen concentration, the NO removal efficiency increased with NSR. The temperature and NSR-dependencies of the NO removal efficiency predicted by CHEMKIN-II simulations were similar to that of the experimental results.

The Removal of NOx by Mediated Electrochemical Oxidation Using Ag(II) As a Mediator (Ag(II)를 매개체로 사용하는 전기화학적 매개산화에 의한 NOx 제거)

  • Lee, Min-Woo;Park, So-Jin;Lee, Kune-Woo;Choi, Wang-Kyu
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
    • /
    • v.9 no.3
    • /
    • pp.121-129
    • /
    • 2011
  • The effects of the applied current density, the $AgNO_3$ concentration, the scrubbing liquid flow rate and the NO-air mixed gas flow rate on the NO removal efficiency were investigated by using $Ag^{2+}$ mediated electrochemical oxidation (MEO). Results showed that the NO removal efficiency increased with increasing the applied current density. The effect of the $AgNO_3$ concentration on the NO removal efficiency was negligibly small in the concentration of $AgNO_3$ above 0.1 M. When the scrubbing liquid flow rate increased, the NO removal efficiency was gradually increased. On the other hands, the NO removal efficiency decreased with increasing the NO-air mixed gas flow rate. As a result of the treatment of NO-air mixed gas by using the MEO process with the optimum operating condition and the chemical absorption process using 3 M $HNO_3$ solution as a scrubbing liquid, the removal efficiency of NO and $NO_x$ was achieved as 95% and 63%, respectively.

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
    • /
    • /
    • 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

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