• Title/Summary/Keyword: 개질실

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Convergent Study on the Hydro-Gas Reforming Cyclo-Incinerator (물 가스 개질 고속선회 소각로에 관한 융합연구)

  • Han, Doo-Hee
    • Journal of the Korea Convergence Society
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    • v.11 no.10
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    • pp.231-236
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    • 2020
  • A water reforming reaction high-speed turning incinerator test facility was prepared. The reforming reaction chamber and the combustion chamber were directly connected. The incinerator and dust collecting device were integrated and made into a double bulkhead type air cooling structure. The blower is built into the dust collector to improve spatial efficiency. An axial flow type multi-stage dust collector was applied by collecting dust by using a plurality of dust collecting bins attached to the side of the dust collecting part. As a result of measuring dioxin among the exhausted gases, results below the standard value were obtained. As a result of measuring exhaust gas and heavy metals, results were obtained below the environmental standard.

The Performance & Operation Analysis of a Plate Type Reformet for 2 kW Class MCFC Stack (2 kW급 MCFC용 평편형 개질기 운전결과)

  • Seo, Hal-Kung;Ahn, Kyo-Sang;Lim, Hee-Chun;Lee, Sang-Deuk
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.2
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    • pp.159-167
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    • 2002
  • The operation results of the 2kW class plate type reformer, which has several advantages compared with the tubular burner type reformer, are analyzed. This plate type reformer is composed of six combustion chambers and five reforming chambers by turns. The methane conversion rate at 1.6 absolute pressure is about 84%, which is reasonably similar to theoretical value, 85.3%. Though the abrupt interruption was made just by the carbon deposition during heating the fuel line to combustion chambers around 200 hours operation, the overall steady state operation is more than 450 hours. These operation results show the verification of long run performance and the possibility of direct connection between plate reformer and fuel cell stack.

Self-Aggregated Nanoparticles of Lipoic Acid Conjugated Hyaluronic Acid (히알루론산에 결합된 리포산 자기조립체의 제조 및 특성)

  • Hong, In-Rim;Kim, Young-Jin
    • Polymer(Korea)
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    • v.32 no.6
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    • pp.561-565
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    • 2008
  • Hyaluronic acid (HA) is a natural glycosaminoglycan and is used widely in the pharmaceutical field. Lipoic acid (LA) helps the regeneration of exogenous and endogenous antioxidants such as Vitamin C and Vitamin E as well as glutathione. It also acts as antioxidant indirectly. Hydrophilic HA as a biodegradable and biocompatible polymer was conjugated with hydrophobic LA as an antioxidant to form the graft copolymer. The carboxyl group of HA was modified by adipic acid dihydrazide (ADH). The synthesis of HA-g-LA graft copolymers was characterized by FT-IR, $^1H$-NMR spectroscopy. The conjugates could form the self-assembled nanoparticles in aqueous solution. The particle size and critical aggregation concentration were verified to use the nanoparticle as a carrier fur the hydrophobic material.

The Effect of Plasma on Hydrophilic Surface Modification of LDPE (저밀도 폴리에틸렌의 친수성 표면개질에 미치는 플라즈마의 영향)

  • Hwang, Seung-No;Jeon, Bup-Ju;Jung, Il-Hyun
    • Applied Chemistry for Engineering
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    • v.9 no.3
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    • pp.383-387
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    • 1998
  • The effect of hydrophilic surface modification of low density polyethylene(LDPE) byt the plasma gas($O_2$, $N_2$, and $O_2/N_2$) was investigated from the point of view of the functionalities of the generated LDPE surfaces and the contact angle. By virtue of x-ray photoelectron spectra(XPS) and attenuated total reflectance(FT-IR ATR) analysis, the LDPE surfaces treated with plasma were generated with oxygen functionalities of carbonyl, carboxyl, and the like, nitrogen functionalities by nitrogen plasma and mixing of nitrogen and oxygen plasma treatment were identified with. It was found that nitrogen plasma treatment showed with minimum value at contact angle for rf-power and treatment time, we had obtained optimum condition for hydrophilic surface modification at composite parameter, [(W/FM)t] 520~550GJs/kg.

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Dielectric Properties for Surface Modified Micro-Nano Silica Composites of Cycloaliphatic Epoxy (지환식 에폭시/표면개질된 마이크로-나노실리카 콤포지트의 유전특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1840-1847
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    • 2016
  • The surface of nanosilica and microsilica was modified in order to develop a high voltage insulation material for outdoor application. The modified silicas were well dispersed in an aliphatic cyclic epoxy resin. Dielectric properties were studied for 8 kinds of specimens: 1 kind of neat epoxy, 3 kinds of epoxy/microsilica composites, and 4 kinds of epoxy/microsilica/nanosilica composites. Complex dielectric constants were measured in the range of 10-2~1.2 Hz at room temperature.

Study on the Thermal Characteristics of Concrete Using Insulation Performance Improve Material (단열성능향상 재료를 사용한 콘크리트의 열적 특성에 관한 연구)

  • Park, Young-Shin;Kim, Jung-Ho;Kang, Yeun-Woo;Youm, Kwang-Soo;Jeon, Hyun-Kyu
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.227-228
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    • 2013
  • Recently, it is certain that the increase of heating and cooling energy consumption by radical change in climate condition has caused serious problems related to environmental and energy concerns associated with increase of fossil fuel usage and carbon dioxide production as well as global warming. So, various actions to reduce greenhouse gas exhaustion and energy consumption have been prepared by world developed countries. The energy consumption by buildings approximately reaches 25% of total korea energy consumption. The greatest part in the buildings of the energy consumption is building facade. but a few research projects on concrete comprising more than 70% of outsider of buildings has been tried. This research structural insulation concrete what improved insulation performance using insulation performance improve material.

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A Numerical Analysis on Combustion Characteristics of the Gasoline Engine using Methanol Reformulated Fuels under WOT Condition (전부하 운전조건에서 메탄올 개질연료를 사용한 가솔린 엔진의 연소특성에 대한 수치해석)

  • Lee, Suk-Young;Jeon, Chung-Hwan
    • Journal of Energy Engineering
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    • v.20 no.2
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    • pp.163-169
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    • 2011
  • This research is to decide the possibility of using RM50(reformulated methanol fuel) without any modification of engine by the method of numerical analysis. Comparing the heat release rate, the difference among each fuel was decreased according to the increase of the engine speed, and the maximum heat release rate was higher in the order of RM50 and gasoline fuel. Also, this order corresponds to the order of burning speed. RM50 had the higher turbulent burning speed, and the curve of turbulent intensity was showed similar tendency to the curve of turbulent burning speed. RM50 had relatively high burning speed, short quenching length, high temperature in cylinder, so that it might increase NO emission, but owing to chemical reaction dynamics, it was decreased NO emission. Therefore, in order to predict the possibility of using RM50, it is needed to consider not only the temperature in cylinder by low heating value, but also combustion characteristics including burning speed.

Effect of Vinyltriethoxysilane Content on Mechanical and Physical Properties of Precipitated Silica Reinforced Silicone Rubber (비닐트리에톡시실란 함량에 따른 습식실리카로 충전된 실리콘 고무의 기계적 및 물리적 물성)

  • Jin, Sung-Hoon;Hong, Jin-Ho;Kim, Il;Yun, Ju-Ho;Shim, Sang-Eun
    • Polymer(Korea)
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    • v.35 no.4
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    • pp.342-349
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    • 2011
  • The effect of the amount of vinyltriethoxysilane (VTEOS) in precipitated silica filled silicone rubbers was extensively investigated in terms of the change of mechanical properties, heat resistance, oil resistance, compression set, resilience, and curing characteristics. As the content of VTEOS increased from 0 to 2.0 phr, the hardness of the silicone rubber increased, however, tensile strength, elongation at break, and tear strength decreased. From heat resistance test, the change of mechanical properties was pronounced for silicone rubber treated with more VTOES. The best heat resistance was achieved at 2.0 phr VTOES. In addition, oil resistance was proportionally improved with VTEOS content. From oil resistance test. it was found that the decrease in hardness and maximum elongation was reduced for VTEOS-added systems. Finally, resilience, compression set, degree of cure and crosslink density were significantly enhanced with the amount of VTEOS.

Effects of Nano Silica and Siloxane on Properties of Epoxy Composites for Adhesion of Micro Electronic Device (나노 실리카 및 실록산이 초소형 전자소재 접착제용 에폭시 복합재의 물성에 미치는 효과)

  • Lee, Donghyun;Kim, Daeheum
    • Korean Chemical Engineering Research
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    • v.47 no.3
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    • pp.332-336
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    • 2009
  • When NCAs(non-conductive adhesives) are used for adhesion of micro-electronic devices, they often show problems such as delamination and cracking, due to the differences of CTE(coefficients of thermal expansion) between NCAs and substrates. Additions of inorganic particles or flexibilizers have been performed to solve those problems. The effects of silica addition on thermal/mechanical properties of amino modified siloxane(AMS)/silica/epoxy-nanocomposites were examined. The silica was treated by 3-glycidoxypropyltrimethoxysilane(GPTMS) for better compatibility between silica and epoxy matrix. AMS/silica/epoxy-nanocomposites filled with various amounts of AMS(1 and 3 phr) and various amounts of silica(3, 5 and 7 phr) were prepared. And Tg, moduli and CTE of nanocomposites were analyzed. Tg of AMS/Aerosil(non-modified silica)/epoxy-nanocomposites decreased from 125 to $118^{\circ}C$ with increasing Aerosil contents and moduli increased from 2,225 to 2,523 MPa with increasing Aerosil contents. Tg of AMS/M-silica (modified silica)/epoxy-nanocomposites decreased from 124 to $120^{\circ}C$ with increasing M-silica contents and moduli increased from 1,981 to 2,743 MPa with increasing M-silica contents. CTE of AMS/Aerosil/epoxy-nanocomposites and AMS/M-silica/epoxy-nanocomposites showed decreasing tendency regardless of the surface treatments.

A study on the Optimization of Activated carbon Adsorbent Preparation condition and Evaluation of Application Supporting of K-Fe-Li ternary metal ions for Improving Adsorption Capacity of Hydrogen Sulfide (H2S) (황화수소(H2S) 흡착성능 증진을 위한 K-Fe-Li 3원계 금속이온물질이 담지된 활성탄 흡착제 제조조건 최적화 및 적용성 평가 연구)

  • Choi, Sung Yeol;Han, Dong hee;Kim, Sung Su
    • Clean Technology
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    • v.25 no.3
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    • pp.189-197
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    • 2019
  • In this study an optimization of the preparation conditions of activated carbon with a ternary metal ion material to treat $H_2S$, which is classified as a representative odor substance, was carried out. For a metal ion material for enhancing the adsorption performance of hydrogen sulfide, performance enhancement was confirmed by combining Li and Fe or a ternary combination (K, Li, Fe) based on KI, which is a substance promoting hydrogen sulfide adsorption performance. Also, it was determined by XRD analysis that the reaction of each active substance with $H_2S$ was because of binding. The adsorption performance increased more than 3 times with heat treatment of the adsorbent with nitrogen compared with heat treatment with air. The maximum adsorption constant ($q_m$) value of the optimum adsorbent was 97.07, which is 6 times higher than that of the existing K-based impregnated activated carbon. It was confirmed that the objective adsorption amount ($0.3g\;g^{-1}$) was secured by an equilibrium between the mass transfer rate and adsorption rate. From the results, it was confirmed that the performance improvement was noticeable even when activated carbon with a reagent grade activated carbon particle size was modified. It was confirmed that the adsorption performance exists at high relative humidity levels of 60 and 100%, and the optimized preparation can be applied to a wet process such as a scrubber downstream.