• Title/Summary/Keyword: 수소생산효율

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Development of Integrated NG Fuel Processor for Residential PEMFC system (가정용 고분자연료전지 시스템을 위한 통합형 천연가스 개질기 개발)

  • Seo Yutaek;Seo Dong Joo;Jeong Jin Hyeok;Yoon Wang Lai
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.231-234
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    • 2005
  • 수소 기반의 에너지 사회는 중소규모 분산 발전과 연료 전지 자동차에서 시작될 거라는 예측이 지배적이다. 가정용 고분자 연료전지 시스템은 상업화에 가장 가까운 소규모 분산 발전 시스템중의 하나이며, 에너지기술연구위원에서는 가정용 고분자 연료전지에 수소를 공급하기 위한 천연가스 수증기 개질시스템의 개발을 진행해 왔다. 효율 향상과 제작의 용이성, 그리고 소형화에 초점을 맞추어 개발된 prototype-I은 $2.0Nm^3/hr$의 순수 수소 생산 용량을 가지고 있으며, 수증기 개질기와 수성가스 전이 반응기 수중기 생성 장치, 그리고 반응열 공급에 필요한 버너 등을 이중 동심원관에 통합한 형태이다. 수중기 개질과 수성가스 전이 반응을 거쳐 나오는 개질 가스의 조성은 $72.3\%\;H_2,\;4.8\%\;CH_4,\;0.7\%\;CO,\;22.2\%\;CO_2$이며, 이때 S/C 비율은 2.5였다. 고분자 연료 전지 공급 시 요구되는 CO 농도가 10ppm 이하이기 때문에, 본 시스템에는 선택적 산화 반응기를 2단으로 설치하여 CO. 농도를 10ppm 이하로 낮추어주었다. 전체 시스템의 열효율은 LHV 기준으로 $68\%$. Prototype-I의 운전을 통해 설계 개선안을 도출하였으며, 이를 적용해 제작한 prototype-II가 시험 운전 중이다,. 통합된 개질 시스템에서는 각 단위 반응기사이의 열교환을 최적화하여 단위 반응들이 적정 온도 범위에서 일어나도록 유도하는 것이 중요하다. Prototype-II는 수증기 개질 반응기와 WGS 반응기, 수증기 생성 장치 사이의 열교환율을 향상시켜 농도를 $2.5\%$로 감소시키면서 CO의 농도는 $1\%$이하로 유지하였다. 이 결과를 바탕으로 얻어진 메탄 전환율은 $87\%$이고, 열효율은 LHV 기준으로 $75\%$이다. 아울러 개선점을 적용한 선택적 산화 반응기를 제작하였다. 개질 가스와 산소의 혼합을 유도하고, 반응기 온도의 제어를 통해 선택적 산화 반응의 속도와 선택성을 향상시키고자 한다. 시스템의 운전을 통해 메탄 전환율과 열효율의 개선을 진행할 예정이다.

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Environmental Survey for Productivity Enhancement of Cultured Fleshy Prawn Penaeus chinensis II. Sediment Type-Dependent Environmental Quality and Productivity (대하 양식장의 생산성 향상을 위한 환경 관리에 관한 연구 II. 저질성상에 따른 환경특성 및 생산성)

  • 강주찬;구자근;이정식
    • Journal of Aquaculture
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    • v.13 no.4
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    • pp.303-308
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    • 2000
  • Effects of the sediments on water quality, and the consequent survival and growth of cultured fleshy prawns, Penaeus chil1ensis were determined under selected sediment types for 6 weeks. Dissolved oxygen was 5.1-5.9 mgll in both the sediments containing sand alone, and soft sand (50%) and mud (50%). It decreased to 4.6 mgll in the mud after 6 weeks. Nitrite, ammonia and hydrogen sulfide of the seawater were 0.07-0.12, 0.16-0.29 and 0.009~0.014 mgll in both the sediments containing sand alone, and soft sand (50%) and mud (50%). The values, however, increased to 0.15, 0.36 and 0.018 mgll in the mud sediment, respectively. Survival of the prawn was below 60% in bare and mud sediments. It was above 70% in both the sediments containing sand alone, and soft sand (50%) and mud (50%). Growth and food efficiency of the prawn were significantly lower in the 100 % sand than in the sediment containing soft sand (50%) and mud (50%).

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Study on Process Parameters for Effective H2 Production from H2O in High Frequency Inductively Coupled Plasma Reactor (고주파유도결합플라즈마 반응기에서 물로부터 수소생성효율을 높이기 위한 공정변수에 대한 연구)

  • Kwon, Sung-Ku;Jung, Yong-Ho
    • Transactions of the Korean hydrogen and new energy society
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    • v.22 no.2
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    • pp.206-212
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    • 2011
  • The effect of process parameters on $H_2$ production from water vapor excited by HF ICP has been qualitatively examined for the first time. With the increase of ICP power, characteristics of $H_2$ production from $H_2O$ dissociation in plasma was divided into 3 regions according to both reaction mechanism and energy efficiency. At the edge of region (II) in the range of middle ICP power, energy effective hydrogen production from $H_2O$ plasma can be achieved. Furthermore, within the region (II) power condition, heating of substrate up to $500^{\circ}C$ shows additional increase of 70~80% in $H_2$ production compared to $H_2O$ plasma without substrate heating. This study have shown that combination of optimal plasma power (region II) and wall heating (around $500^{\circ}C$) is one of effective ways for $H_2$ production from $H_2O$.

Design of Nanocomposite Photocatalysts for Solar Hydrogen Production (광화학적 수소제조를 위한 나노복합 광촉매의 설계)

  • Jang, Jum Suk;Kim, Hyun Gyu;Lee, Jae Sung
    • Korean Chemical Engineering Research
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    • v.45 no.5
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    • pp.415-423
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    • 2007
  • Photocatalytic water splitting (PWS) is the most promising technology to produce $H_2$ energy directly from renewable water and solar light. In spite of the remarkable progress made in the last decade, there are still many technical challenges remaining particularly in finding new photocatalytic materials with high efficiency and durability. This article discusses the application of nanocomposite materials in search of new photocatalytic materials for solar hydrogen production from water. It has been demonstrated that smart combination and modification of known materials and functions could be fruitful approach for the purpose.

An Ultrasonic Application with High Frequency for the Efficiency Elevation of the Hydrogen Fuel Production (On the Pole Interval and the Temperature) (수소연료 생산의 효율향상을 위한 고주파수 초음파 응용 (극간격과 온도 중심으로))

  • Song, Min-Geun;Son, Seung-Woo;Ju, Eun-Sun
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.2
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    • pp.127-134
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    • 2002
  • A Study on the application of ultrasonic with high frequency is carried out as a plan to rise the efficiency of the hydrogen fuel production in an electrolysis of water. KOH is selected as an electrolyte and concentrations are 0 %, 10 %, 20 %, and 30%. The solvent is city water. A measurable device of buoyancy by an electronic balance and a measurable device of voltage with a sensor of pressure are planned newly as a measuring device to measure the quantity of hydrogen production. An ultrasonic transducer with high frequency of 2 MHz is selected to give them the ultrasonic forcing. In results, it is clarified that ultrasonic influences the decrease of overpotential in the electrolytic solution. And basic data according to the pole interval and the temperature are obtained.

석탄 합성가스로부터 효율적인 생물학적 수소 생산에 관한 연구

  • 강환구;전희진
    • KSBB Journal
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    • v.15 no.3
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    • pp.268-273
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    • 2000
  • A microbiological hydrogen production process was optimized. Anaerobic photosynthetic bacteria like Rhodospirillum rubrum which is known to produce hydrogen from carbon monoxide efficiently and remove sulfur was used. To evaluate the potenital of this microorganism the optimization of media fermentation condition light intensity and light requirement for CO conversionwas tried in batch cultures and the continuous fermenter was also applied for this process. The gas residence time on CO conversion was sought out to get high conversion of carbon monoxide to hydrogen. Through this study the possibility of microbial synthtics gas concersion process was proposed.

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Performance and Emission Comparisons of a SI Engine Fueled by Syngas with Varying Hydrogen Content (합성가스 연료의 수소 함량 변화가 SI 엔진의 연소특성에 주는 영향)

  • Park, Seung-Hyun;Lee, Sun-Youp;Park, Cheol-Woong;Lee, Jang-Hee
    • Journal of the Korean Institute of Gas
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    • v.15 no.2
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    • pp.63-68
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    • 2011
  • As an effective utilization of biomass, organic wastes and coal, attention has been made to use syngas to a reciprocating engine to generate power. However, significant component variation of syngas depending upon origin and gasification conditions, and its lower heating value than that of LPG and CNG can create difficulties in stable engine operation. Thus it is necessary to address these issues in order to successfully develop power generation engines. As a primary step to resolve these problems, effects of H2 content variation in syngas on engine performance and emission characteristics were discussed in this study. The results show that as H2 % in syngas increases, more stable combustion was achieved with retarded MBT spark timing and engine efficiency becomes maximum with syngas of 10% H2. In addition, NOx emission increased while THC emission decreased as H2 % rises in the syngas.

The Analysis of Main Factors Which Impact on Operation Rate and Power Production of Landfill Gas Power Plant (매립가스 발전시설의 가동률 및 발전량에 미치는 주요 영향요소 분석)

  • Chun, Seung-Kyu
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.3
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    • pp.128-134
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    • 2016
  • An analysis of the main factors and its degree of impact on power production is performed against the landfill gas power plant in S landfill site. The number of normal operation (50 MWh & 24 hr) days was 70.9% to the total number of operation days from 2007 to 2014, and the percentage of the actual power production was 79.3% of 3,428,400 MW which is the theoretical maximum estimation. The ratio of factors that accounted for the efficiency of power production are: 44.0% of repairing of the defect and regular servicing, 37.4% of cut-down operation due to hydrogen sulfide, and 18.6% of air pre-heater washing, respectively. Yet, considering that the cut-down operation due to hydrogen sulfide was carried out for only two years, the high concentration of hydrogen sulfide was the most influential factors on landfill gas power production. The long-term power production was analyzed as 35.9 MWh in 2018, and the constant drop is anticipated, resulting in 16.6 MWh by 2028, and under 8.4 MWh in 2038.

Characterization of Hydrogen Adsorption for the Silicalite-Supported Platinum Catalysts (실리카라이트에 담지된 백금촉매의 수소흡착특성 연구)

  • Ahn, Do Hee;Paek, Seung Woo;Lee, Han Soo;Chung, Hongsuk
    • Applied Chemistry for Engineering
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    • v.7 no.3
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    • pp.410-415
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    • 1996
  • It is well known that the heavy water separation process using hydrogen isotope exchange reaction over the platinum catalyst is the most efficient. In this study, the Pt/silicalite catalysts were prepared and characterized by hydrogen adsorption in order to develop the hydrophobic platinum catalyst for hydrogen isotope exchange reaction. Silicalite was synthesized as support material and it was verified that silicalite is more hydrophobic than activated carbon and ZSM-5. Also the platinum was loaded on silicalite by conventional impregnation and ion-exchange method respectively. The platinum dispersion of Pt/silicalite catalysts was measured through hydrogen adsorption experiment. The dispersion is very low in the catalyst prepared by the impregnation method while it is very high with limited platinum content in the catalyst prepared by the ion-exchange method.

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Evaluating the Efficacy of Commercial Polysulfone Hollow Fiber Membranes for Separating H2 from H2/CO Gas Mixtures (상용 폴리설폰 중공사막의 수소/일산화탄소 혼합가스 분리 성능 평가)

  • Do Hyoung Kang;Kwanho Jeong;Yudam Jeong;Seung Hyun Song;Seunghee Lee;Sang Yong Nam;Jae-Kyung Jang;Euntae Yang
    • Membrane Journal
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    • v.33 no.6
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    • pp.352-361
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    • 2023
  • Steam methane reforming is currently the most widely used technology for producing hydrogen, a clean fuel. Hydrogen produced by steam methane reforming contains impurities such as carbon monoxide, and it is essential to undergo an appropriate post-purification step for commercial usage, such as fuel cells. Recently, membrane separation technology has been gaining great attention as an effective purification method; in this study, we evaluated the feasibility of using commercial polysulfone membranes for biogas upgrading to separate and recover hydrogen from a hydrogen/carbon monoxide gas mixture. Initially, we examined the physicochemical properties of the commercial membrane used. We then conducted performance evaluations of the commercial membrane module under various conditions using mixed gas, considering factors such as stage-cut and operating pressure. Finally, based on the evaluation results, we carried out simulations for process design. The maximum H2 permeability and H2/CO separation factor for the commercial membrane process were recorded at 361 GPU and 20.6, respectively. Additionally, the CO removal efficiency reached up to 94%, and the produced hydrogen concentration achieved a maximum of 99.1%.