• 제목/요약/키워드: Energy loss reduction

검색결과 340건 처리시간 0.028초

부반응 저감 조성 K계 건식 CO2 흡수제 특성평가 (Characterization of Potassium Based Dry CO2 Sorbents Developed for the Reduction of Side Reactions)

  • 장영신;김의식;윤양노;백점인
    • KEPCO Journal on Electric Power and Energy
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    • 제5권4호
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    • pp.337-341
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    • 2019
  • In this study, the effects of two materials, active alumina and CaO based inorganic binder, which cause the side reaction on the K2CO3-based solid CO2 sorbents was investigated. K2CO3-based solid sorbents called KAM series was prepared by spray drying method and then measured its physical properties and CO2 sorption capacity. Among the KAM series sorbents, KAM(0.5) maintained high CO2 sorption capacity of 7.6 wt% after 3 cycle of sorption/regeneration reaction and showed very low attrition loss as low as 3.1 % which was measured by ASTM D5757-95.

보일러 연소관리를 위한 화염감시 시스템 개발에 관한 연구 (A Study on Flame Monitoring System Development for Combustion Management of Boilers)

  • 백운보;신진호
    • 대한기계학회논문집B
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    • 제27권11호
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    • pp.1587-1594
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    • 2003
  • Increased energy costs have placed demands for improved combustion efficiency, high equipment availability, low maintenance and safe operation. Furthermore low NO$_x\$ modification, installed due to strict environmental legislation, requires very careful combustion management. The flame monitoring system has been developed specially to satisfy these requirements. We aimed at gaining the relationship between the burner flame image and emissions such as NO$_x$ and unburned carbon in furnace by utilizing the image processing method. For the first step of development, its possibility test was undertaken with bench furnace. The test proceeded to the second step with pilot furnace and the system was observed to be effective for evaluating the combustion conditions. By using this technology, it is possible to perform continuous monitoring of the combustion conditions and instant detection of individual changes for each burner to prevent future loss of ignition. This may contribute to the saving of burner adjusting times for the changes of loads and fuels and to the reduction of the slagging as well.

Chronic Alcohol Consumption Induced Tibial Bone Loss and Resulted in Osteopenia in Growing Young Male Rats

  • Kwak Chung Shil;Song Kye Yong;Park Sang Chul
    • Nutritional Sciences
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    • 제8권2호
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    • pp.89-96
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    • 2005
  • To determine the deleterious effects of chronic alcohol consumption on bone especially in adolescents or young adults, 8 week-old Sprague Dawley male rats were fed with Lieber-Decarli ethanol liquid diet, containing $36\%$ of energy as ethanol, ad libitum (ethanol group) or isocaloric normal liquid diet (control group) for 7 weeks. Body weight was significantly lower in ethanol group than that in control group after 1 week of feeding to the end. liver weight and the ratio of liver or kidney weight to body weight in ethanol group were significantly increased when compared to those in control group. Ethanol group showed significantly lower serum protein and albumin levels (p<0.05), higher total cholesterol and HDL-cholesterol levels (p<0.05), and AST, ALT and BUN activities than control group, but serum triglyceride, Ca and phosphate levels were not different. Ethanol group had significantly lower tibial trabecular bone area and serum osteocalcin level than control group (p<0.05), but urinary Ca and NTx (cross-linked N-telopeptide of type I collagen) concentrations and serum testosterone and parathyroid hormone levels were not different. In conclusion, chronic alcohol consumption in growing young male rats may result in osteopenia through the reduction of bone formation as well as liver malfunction.

Effect of Snubber-Array on Variation of Pressure Characteristics in Reciprocating Hydrogen Compression

  • Chung, Han-Shik;Rahman, M. Sq.;Lee, Gyeong-Hwan;Jin, Zhenhua;Kim, Jeong-Hyeon;Jeong, Hyo-Min
    • Journal of Advanced Marine Engineering and Technology
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    • 제33권7호
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    • pp.1034-1043
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    • 2009
  • Hydrogen energy is becoming popular day by day due to its renewability and pollutaaant free natures. Hydrogen gas pressure which is after passing through reciprocating compressor part has high pulsation wave form. A unit, snubber is used as compressor components to reduce the harmful pulsation waveform and to remove the impurities in the hydrogen gas. An experiment has been conducted to investigate the pulsation reduction performance of different arrangement of snubber i.e. snubber array used in reciprocating compression system. Analyzing the snubber array experimental data, it is found that the pressure fluctuations are reduced from 90.1977% ~ 92.6336% with pressure loss 1.5013% ~ 4.9034% for compressor operation at different speed which ensure the good performance of snubber-array as pulsation damper in hydrogen compressing system.

연돌효과 저감을 위한 E/V샤프트 냉각장치의 적용에 대한 연구 (A study on application of an E/V shaft cooling system to reduce the stack effect in high-rise building)

  • 임현우;이준호;서정민;송두삼;이중훈
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.284-292
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    • 2009
  • The stack-effect in high-rise buildings in winter causes many problems such as difficulties in opening or closing doors, infiltration, energy loss, noise and fire protection. Stack effect is influenced by temperature difference between the interior and exterior of building and the height of building. As an attenuation method for stack effect, the architectural methods are generally used. However, as though architectural methods were fully adopted, the problems are reported as ever in tall building. In this study, a new method to reduce stack effect will be suggested. As an active control method against the stack effect, E/V shaft natural cooling method is suggested. In this paper, the concept of E/V shaft natural cooling system and its reduction performance of stack effect by simulation and field measurement will be reported.

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Development and Performance of a Jatropha Seed Shelling Machine Based on Seed Moisture Content

  • Aremu, A.K.;Adeniyi, A.O.;Fadele, O.K.
    • Journal of Biosystems Engineering
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    • 제40권2호
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    • pp.137-144
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    • 2015
  • Purpose: The high energy requirement of extraction of oil from jatropha seed and reduction of loss in oil content between whole seed and kernel of jatropha necessitate seed shelling. The purpose of this study is to develop and evaluate the performance of a jatropha seed shelling machine based on seed moisture content. Methods: A shelling machine was designed and constructed for jatropha seed. The components are frame, hopper, shelling chamber, concave, and blower with discharge units. The performance evaluation of the machine was carried out by determining parameters such as percentage of whole kernel recovered, percentage of broken kernel recovered, percentage of partially shelled seed, percentage of unshelled seed, machine capacity, machine efficiency, and shelling efficiency. All of the parameters were evaluated at five different moisture levels: 8.00%, 9.37%, 10.77%, 12.21%, and 13.68% w.b.). Results: The shelling efficiency of the machine increased with increase in seed moisture content; the percentage of whole kernel recovered and percentage of partially shelled seed decreased with increase in moisture content; and percentage of broken kernel, machine efficiency, and percentage of unshelled seed followed a sinusoidal trend with moisture content variation. Conclusion: The best operating condition for the shelling machine was at a moisture content of 8.00% w.b., at which the maximum percentage of whole kernel recovered was 23.23% at a shelling efficiency of 73.95%.

배관 침부식 손상 연속모사 장비 개발 및 실증 (Development and demonstration of an erosion-corrosion damage simulation apparatus)

  • 남원창;류경하;김재형
    • Corrosion Science and Technology
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    • 제12권4호
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    • pp.179-184
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    • 2013
  • Pipe wall thinning caused by erosion and corrosion can adversely affect the operation of aged nuclear power plants. Some injured workers owing to pipe rupture has been reported and power reduction caused by unexpected pipe damage has been occurred consistently. Therefore, it is important to develop erosion-corrosion damage prediction model and investigate its mechanisms. Especially, liquid droplet impingement erosion(LDIE) is regarded as the main issue of pipe wall thinning management. To investigate LDIE mechanism with corrosion environment, we developed erosion-corrosion damage simulation apparatus and its capability has been verified through the preliminary damage experiment of 6061-Al alloy. The apparatus design has been based on ASTM standard test method, G73-10, that use high-speed rotator and enable to simulate water hammering and droplet impingement. The preliminary test results showed mass loss of 3.2% in conditions of peripheral speed of 110m/s, droplet size of 1mm-diameter, and accumulated time of 3 hours. In this study, the apparatus design revealed feasibility of LDIE damage simulation and provided possibility of accelerated erosion-corrosion damage test by controlling water chemistry.

Preparation and Electromagnetic Properties of an Electromagnetic Wave Absorber

  • Sun, Chang;Sun, Kangning;Pang, Laixue;Liu, Jian
    • Journal of Magnetics
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    • 제21권1호
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    • pp.61-64
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    • 2016
  • In this study, we report the as-prepared MgO-doped $BaFe_{12}O_{19}$, which was prepared by calcination technique and high-energy ball milling process, as an electromagnetic wave absorber. The phase analysis of $BaFe_{12}O_{19}$ and the as-prepared MgO-doped $BaFe_{12}O_{19}$ was detected utilizing X-ray Diffractometer (XRD). The microstructure was characterized using Scanning Electron Microscope (SEM). By means of the transmission/reflection coaxial line method, the electromagnetic properties and microwave absorbing properties of the as-prepared electromagnetic wave absorber were studied. It is found that the electromagnetic wave absorber has a minimum reflection loss value of -41 dB at 4.27 GHz with a matching thickness of 2.6 mm. The experiment results revealed that the as-prepared electromagnetic wave absorber could find potential applications in many military as well as commercial industries.

어류양식장 저질개선을 위한 과산화칼슘 투입에 의한 생태 환경변화 관찰 (A Study on Bioremediation of Fish Farm Sediment Using CaO2 by Enhancement of Indigenous Microbial Activity)

  • 조대철;배환진;권성현
    • 한국환경과학회지
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    • 제21권10호
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    • pp.1187-1193
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    • 2012
  • The aim of this research is to enhance the bottom environment of Geoje fish farm that has been severely contaminated. Treatment of microbial agent and/or calcium oxide significantly changed that environment: in ignition loss, either treatment (25% or 21%) showed better than mixed treatment (13.2%). In COD, the oxygen releasing agent or mixed treatment reduced the index by more than 20%. In T-P and T-N, the effects of $CaO_2$ on them were overwhelming (50% or more) meanwhile that of the microbial agent on them was less than 20%. Also, $CaO_2$ influenced on the microbial flora: Desulfobvibrio thermophilus, a sulfate reducing bacterium decreased in number, considering the increase of pH and rise of redox potential. In contrast, Pseudomonas sp., Pseudoalteromonas sp., Pseudomonas aeruginosa were remarkably dominant over other species with mixed treatment as a PCA analysis confirmed it.

다구찌 기법을 통한 LPG 저장탱크시공방법의 최적화에 관한 연구 (A Study on the Optimal Installation Technology of LPG Storage Tank through Taguchi Method)

  • 임사환;허용정;백승철;이종락
    • 한국안전학회지
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    • 제25권6호
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    • pp.98-102
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    • 2010
  • LPG (Liquefied Petroleum Gas) vehicles in metropolitan area are being applied to improve air quality and have been proven effective for the reduction of air pollutant. In addition, the demand of gas as an eco-friendly energy source has being increased. With the LPG filling station is also increasing every year. These gas stations are required to install the securest storage tank because of possibility of causing huge loss of life and property. Therefore, in this paper, underground containment type is proposed as installation of the LPG storage tank using Taguchi method, which is considered to be more safe, economical, efficient, easy checking and simple construction method than any other. If leakage, economics, real estate utilization rate, safety, easy to check, simple construct about above ground, buried underground and underground containment storage tank are analyzed by Taguchi method, real estate utilization rate, economic and safety in turn are improved. Therefore, the underground containment storage tank is a optimal installation technology.