• Title/Summary/Keyword: catalysis reactor

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A study of decomposition of sulfur oxides(harmful gas) using calcium dihydroxide catalyst by plasma reactions (Ca(OH)2촉매를 이용한 플라즈마 반응에 의한 황산화물(유해가스)의 제거에 관한 연구)

  • Kim, Dayoung;Hwang, Myungwhan;Woo, Insung
    • Journal of the Korea Safety Management & Science
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    • v.16 no.2
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    • pp.237-246
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    • 2014
  • Researches on the elimination of sulfur and nitrogen oxides with catalysts and absorbents reported many problems related with elimination efficiency and complex devices. In this study, decomposition efficiency of harmful gases was investigated. It was found that the efficiency rate can be increased by moving the harmful gases together with SPCP reactor and the catalysis reactor. Calcium hydroxide($Ca(OH)_2$), CaO, and $TiO_2$ were used as catalysts. Harmful air polluting gases such as $SO_2$ were measured for the analysis of decomposition efficiency, power consumption, and voltage according to changes to the process variables including frequency, concentration, electrode material, thickness of electrode, number of electrode winding, and additives to obtain optimal process conditions and the highest decomposition efficiency. The standard sample was sulfur oxide($SO_2$). Harmful gases were eliminated by moving them through the plasma generated in the SPCP reactor and the $Ca(OH)_2$ catalysis reactor. The elimination rate and products were analyzed with the gas analyzer (Ecom-AC,Germany), FT-IR(Nicolet, Magna-IR560), and GC-(Shimazu). The results of the experiment conducted to decompose and eliminate the harmful gas $SO_2$ with the $Ca(OH)_2$ catalysis reactor and SPCP reactor show 96% decomposition efficiency at the frequency of 10 kHz. The conductivity of the standard gas increased at the frequencies higher than 20 kHz. There was a partial flow of current along the surface. As a result, the decomposition efficiency decreased. The decomposition efficiency of harmful gas $SO_2$ by the $Ca(OH)_2$ catalysis reactor and SPCP reactor was 96.0% under 300 ppm concentration, 10 kHz frequency, and decomposition power of 20 W. It was 4% higher than the application of the SPCP reactor alone. The highest decomposition efficiency, 98.0% was achieved at the concentration of 100 ppm.

Organic and inorganic carbon-14 in discharges of JSC Institute of Nuclear Materials

  • E.I. Nazarov;A.A. Ekidin;A.V. Kruzhalov;M.E. Vasyanovich;A.I. Lysikov;P.N. Kalinkin;I.M. Russkikh
    • Nuclear Engineering and Technology
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    • v.55 no.6
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    • pp.2107-2111
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    • 2023
  • The aim of the study is the activity concentration measurements of organic and inorganic 14C in the discharges of JSC "Institute of Nuclear Materials" (INM). In INM the research water-water reactor "IVV-2M" is operating. Collecting of 14C species was performed using a 14C sampler with a chromium oxide and platinum catalysts at different temperatures: 400, 550 and 700 ℃. The measurements of 14C activity were performed using a liquid scintillation counter. The share of organic 14C in emissions ranged from 0.30 to 0.84 and depends on the temperature of the catalyst, core structure and reactor operating mode.

Reduction and Decomposition of Hazardous NOx by Discharge Plasma with $TiO_2$ ($TiO_2$ 촉매를 이용한 플라즈마반응에 의한 NOx의 분해)

  • Park, Sung-Gug;Woo, In-Sung;Hwang, Myung-Whan
    • Journal of the Korean Society of Safety
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    • v.23 no.5
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    • pp.54-60
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    • 2008
  • The objective of this study is to obtain the optimal process condition and the maximum decomposition efficiency by measuring the decomposition efficiency, electricity consumption, and voltage in accordance with the change of the process variables such as the frequency, maintaining time period, concentration, electrode material, thickness of the electrode, the number of windings of the electrode, and added materials etc. of the harmful atmospheric contamination gases such as NO, $NO_2$, and $SO_2$ etc. with the plasma which is generated by the discharging of the specially designed and manufactured $TiO_2$ catalysis reactor and SPCP reactor. The decomposition efficiency of the NO, the standard samples, is obtained with the plasma which is being generated by the discharge of the combination effect of the $TiO_2$ catalysis reactor and SPCP reactor with the variation of those process variables such as the frequency of the high voltage generator($5{\sim}50kHz$), maintaining time of the harmful gases($1{\sim}10.5sec$), initial concentration($100{\sim}1,000ppm$), the material of the electrode(W, Cu, Al), the thickness of the electrode(1, 2, 3mm), the number of the windings of the electrode(7, 9, 11turns), basic gases($N_2$, $O_2$, air), and the simulated gas($CO_2$) and the resulting substances are analyzed by utilizing FT-IR & GC.

A study of decomposition of sulfur oxides using Calcium hydroxide catalyst by plasma reactions (Ca(OH)2촉매를 이용한 플라즈마 반응에 의한 황산화물의 제거에 관한 연구)

  • Kim, Da Young;Woo, In Sung;Lee, Sun Hee;Kim, Do Hyeon;Kim, Byeong Cheol
    • Proceedings of the Safety Management and Science Conference
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    • 2013.11a
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    • pp.547-560
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    • 2013
  • In this study, the air pollutant removal such as sulfur oxides was studied. A combination of the plasma discharge in the reactor by the reaction surface discharge reactor Calcium hydroxides catalytic reactor and air pollutants, hazardous gas SOx, changes in gas concentration, change in frequency, the thickness of the electrode, kinds of electrodes and the addition of simulated composite catalyst composed of a variety of gases, including decomposition experiments were performed by varying the process parameters. The experimental results showed the removal efficiency of 98% in the decomposition of sulfur oxides removal experiment when Calcium hydroxides catalysts and the tungsten(W) electrodes were used. It was increased 3% more than if you do not have the catalytic. If added to methane gas was added the removal efficiency increased decomposition.

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Tubular reactor design for the oxidative dehydrogenation of butene using computational fluid dynamics (CFD) modeling

  • Mendoza, Joseph Albert;Hwang, Sungwon
    • Korean Journal of Chemical Engineering
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    • v.35 no.11
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    • pp.2157-2163
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    • 2018
  • Catalytic reactors have been essential for chemical engineering process, and different designs of reactors in multi-scales have been previously studied. Computational fluid dynamics (CFD) utilized in reactor designs have been gaining interest due to its cost-effective advantage in designing the actual reactors before its construction. In this work, butadiene synthesis via oxidative dehydrogenation (ODH) of n-butene using tubular reactor was used as a case study in the CFD model. The effects of coolant and reactor diameter were investigated in assessing the reactor performance. Based on the results of the CFD model, the conversion and selectivity were 86.5% and 59.5% respectively in a fixed bed reactor under adiabatic condition. When coolants were used in a tubular reactor, reactor temperature profiles showed that solar salt had lower temperature gradients inside the reactor than the cooling water. Furthermore, higher conversion (90.9%) and selectivity (90.5%) were observed for solar salt as compared to the cooling water (88.4% for conversion and 86.3% for selectivity). Meanwhile, reducing the reactor diameter resulted in smaller temperature gradients with higher conversion and selectivity.

A study of decomposition of harmful gases using Composite catalyst by Photocatalytic plasma reactions (복합촉매를 이용한 플라즈마 반응에 의한 유해가스의 제거에 관한 연구)

  • Park, Hwa-Young;Kim, Kwan-Jung;Woo, In-Sung
    • Journal of the Korea Safety Management & Science
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    • v.15 no.1
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    • pp.121-132
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    • 2013
  • The objective of this study is to maintain the same frequency as the electrode material, concentration, duration of decomposition efficiency, power consumption and voltage measurements using a composite catalyst according to the change of process parameters to obtain the optimum state of the process and the maximum decomposition efficiency. In this paper, known as a major cause of air pollution, such as NO, NO2, SO2, frequency, flow rate, concentration, the material of the electrodes, and using TiO2 catalyst reactor with surface discharge caused by discharging the reactor plasma NOx, SOx decompose the harmful gas want to remove.

Activated Carbon-Photocatalytic Hybrid System for the Treatment of the VOC in the Exhaust Gas from Painting Process (도장공정 배기가스 내 VOC 처리를 위한 활성탄-광촉매 복합시스템)

  • Lee, Chan;Cha, Sang-Won;Lee, Tae-Kyu
    • Journal of Energy Engineering
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    • v.14 no.2 s.42
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    • pp.133-139
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    • 2005
  • An activated carbon-photo catalysis hybrid system is proposed for the treatment of VOC produced from paint booth. and its VOC removal performance is experimentally evaluated. Activated carbon tower is designed on the basis of the adsorption characteristics of toluene. Photocatalytic system is designed as the series of $TiO_2/SiO\_2$ fluidized bed reactor and $TiO_2$-coated filters. The present activated carbon-photo catalysis hybrid system shows the VOC removal efficiency within $75\~100\%$ under different VOC species and concentrations.

Flow Characteristics with Inflow-Duct Types in the Reactor of an Integrated Adsorption/Catalysis Process with Bag Filters (연소 배출가스의 유입방식에 따른 백필터를 활용한 흡착/촉매 통합공정 시스템 반응기 내 유동특성)

  • Choi, Choeng-Ryul
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.31 no.5
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    • pp.425-434
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    • 2007
  • An integrated adsorption/catalytic process has been considered to treat dioxin and $NO_x$ simultaneously. The process consists of a cyclone and a reactor with nine bag filters. In this study, numerical analysis has been performed to understand flow characteristics with inflow-duct types in the reactor. To consider flue gas and activated carbon particles simultaneously, Euler-Lagrangian model was employed. Fundamental flow patterns of flue gas and activated carbon particles, pressure distribution and distribution of activated carbon have been obtained from the numerical analysis. Also trace length and residence time of flue gas, residence time of activated carbon particles have been calculated directly. Flow patterns of flue gas and activated carbon particles in the reactor were very complicated and they moved along very various paths. Therefore, their residence time in the reactor was also various. The flow characteristics in the reactor were strongly influenced by inflow-duct types. The results obtained would be effectively used to estimate the removal efficiency in the reactor once the residence time is combined with the reaction equation.