• Title/Summary/Keyword: oxygen effect

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Experimental Study for Oxygen Methane MILD Combustion in a Laboratory Scale Furnace (Laboratory Scale 연소로를 적용한 산소 메탄 MILD 연소에 대한 실험적 연구)

  • Lee, Pil Hyong;Hwang, Sang Soon
    • Journal of the Korean Society of Combustion
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    • v.21 no.4
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    • pp.6-15
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    • 2016
  • The oxygen fuel MILD (Moderate or Intense Low-oxygen Dilution) combustion has been considered as one of the promising combustion technology for flame stability, high thermal efficiency, low emissions and improved productivity. In this paper, the effect of oxygen and fuel injection condition on formation of MILD combustion was analyzed using lab scale oxygen fuel MILD combustion furnace. The results show that the flame mode was changed from a diffusion flame mode to a split flame mode via a MILD combustion flame mode with increasing the oxygen flow rate. A high degree of temperature uniformity was achieved using optimized combination of fuel and oxygen injection configuration without the need for external oxygen preheating. In particular, the MILD combustion flame was found to be very stable and constant flame temperature region at 7 KW heating rate and oxygen flow rate 75-80 l/min.

The Oxygen Transfer and Oxygen Uptake in Antibiotic Fermentation using Streptomyces kanamyceticus (항생물질발효에서의 산소전달 및 흡수속도에 관한 연구)

  • Lee, Kye-Joon;Moo Bae
    • Microbiology and Biotechnology Letters
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    • v.10 no.3
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    • pp.223-226
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    • 1982
  • The aim of the present study was to assess the oxygen transfer rate and oxygen uptake rate in antibiotic fermentation. As a model study, cultures of Streptomyces kanamyceticus in a complex medium were analyzed to evaluate the oxygen transfer and uptake rates using oxygen balance technique. Quantitative evidence for the effect of oxygen transfer rate on the volumetric antibiotic production was clearly demonstrated. The oxygen uptake rates and the specific oxygen requirements were significantly changed with culture time. Those phenomena were indicative of biological turnover in the antibiotic fermentation.

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Oxygen Adsorption Process on ZnO Single Crystal

  • 전진;한종수
    • Bulletin of the Korean Chemical Society
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    • v.18 no.11
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    • pp.1175-1179
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    • 1997
  • The adsorption of oxygen on ZnO was monitored by measuring the capacitance of two contacting crystals which have depletion layers originated from the interaction between oxygen and ZnO at 298 K-473 K. An admission of oxygen to the sample induced an irreversible increase in the depth and the amount of adsorbed oxygen was less than 0.001 monolayer in the experimental condition. The relation between pressure of oxygen and variation of the depth was tested from the view point of Langmuir or Freundlich isotherm. Using Hall effect measurement and kinetic experiment, a model equation on the adsorption process was proposed. From the results, it was suggested that oxygen adsorption depended on the rate of electron transfer from ZnO to oxygen while the amount of adsorbed oxygen was kinetically restricted by the height of surface potential barrier.

Effect of Ce0.9Gd0.1O1.95 as a promoter upon the oxygen transfer properties of MgMnO3-δ-Ce0.9Gd0.1O1.95 composite oxygen carrier materials for chemical looping combustion

  • Hwang, Jong Ha;Lee, Ki-Tae
    • Journal of Ceramic Processing Research
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    • v.20 no.1
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    • pp.18-23
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    • 2019
  • Chemical looping combustion (CLC) is a promising carbon capture and storage (CCS) technology whose efficiency and cost primarily relies on the oxygen carrier materials used. In this paper, gadolinium-doped ceria (GDC, Ce0.9Gd0.1O1.95) was added as a promoter to improve the oxygen transfer rate of MgMnO3-δ oxygen carrier materials. Increasing GDC content significantly increased the oxygen transfer rate of MgMnO3-δ-GDC composites for the reduction reaction due to an increase in the surface adsorption of CH4 via oxygen vacancies formed on the surface of the GDC. On the other hand, the oxygen transfer rate for the oxidation reaction decreased linearly with increasing GDC content due to the oxygen storage ability of GDC. Adsorbed oxygen molecules preferentially insert themselves into oxygen vacancies of the GDC lattice rather than reacting with (Mg,Mn)O to form MgMnO3-δ during the oxidation reaction.

Study on the effect of Sagunjatang(SGJT) and Samultang(SMT) extract on the Wave of Human body and Active Oxygen (사군자탕(四君子湯) 및 사물탕(四物湯)이 인체파동(人體波動)과 활성산소(活性酸素)에 미치는 영향(影響)에 관(關)한 실험적(實驗的) 연구(硏究))

  • Cho, Ki-Yong;Yoo, Dong-Youl
    • Journal of Haehwa Medicine
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    • v.9 no.1
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    • pp.305-317
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    • 2000
  • To prove the effect of Sagunjatang(SGJT) and Samultang(SMT) extract on the wave of Human Body and Active Oxygen experimentally, QRS & Free Radical of extract and precipitate of SGJT and SMT was measured. The results were summarized as follows ; 1. SGJT extract and precipitate, as a result of measuring QRS and Free Radical, had a considerable effect on the function of immunity & pituitary gland. 2. BaekBokRung of SGJT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of heart & spleen. 3. BaekChul and Gamcho of SGJT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of stomach & duodenum. 4. YinSam of SGJT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of immunity & spleen. 5. SMT extract and precipitate, as a result of measuring QRS and Free Radical, had a considerable effect on the function of immunity & uterus. 6. SukJiHwang of SMT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of immunity & liver. 7. DangGui of SMT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of heart & spleen. 8. ChunGung of SMT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of spleen & pituitary gland. 9. BaekJakYak of SMT, as a result of measuring QRS and Free Radical, had a considerable effect on the function of stomach & duodenum. 10. SMT extract had an effect on the function of female Urogenital system, SGJT extract had an effect on the function of male Urogenital system. These results suggested that SGJT and SMT extract might be usefully applied for suppresing of Active Oxygen formation, preventing the aging, curing all the disease resulted from Active Oxygen.

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The Effect of Line Dance Program on Oxygen Saturation and Happiness of Elderly (라인댄스 프로그램이 노인의 산소포화도와 행복정도에 미치는 영향)

  • Shin, Myeong Gi;Min, Soon;Seo, Min Jeong;Lee, Young Rong
    • Journal of Korean Biological Nursing Science
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    • v.15 no.1
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    • pp.1-7
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    • 2013
  • Purpose: The research was to investigate the effect of line dance programs on oxygen saturation level and happiness of elderlies. Methods: Researchers had conducted a series of test to measure peripheral blood vessel oxygen saturation level, pulse and happiness level of 47 elderlies from the D district of G city. Collected data were analyzed with ${\chi}^2$-test and independent t-test, equipped with SPSS WIN 17.0. Results: As a result of serial tests, Pre-test and Post-test of line dance performance showed that oxygen saturation of the Experimental group had significant increase following the program and happiness of the Experimental group also had significant increase following the program. Conclusion: In conclusion, with many advantages such as its easiness to access and emulate as well as its ubiquitousness as an aerobic exercise, line dance cannot only be very beneficial to cardiovascular function and relation of elderlies, but also to emotional and psychological effect, considered as a great breakthrough to improve comprehensive well-being in both physical and mental aspects.

Characteristics for Effects of Co2 Addition to Oxygen-Enriched Combustion (산소부화연소에서 Co2 첨가에 대한 연소 특성)

  • Kim, Han-Seok;Kim, Ho-Keun;Ahn, Kook-Young;Kim, Yong-Mo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.1
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    • pp.9-15
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    • 2004
  • $CO_2$ is a well-known green house gas as well as the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. Among the method for reducing $CO_2$ emission, oxygen-enriched combustion has been proposed. Because its adiabatic flame temperature is relatively too high, existing facilities must be changed or the flame temperature in the combustion zone should be reduced. The combustion characteristics, composition in the flame zone, temperature profile and emission gases were investigated experimentally for the various oxygen-enriched ratios(OER) by the addition of $CO_2$, under constant $O_2$ flow rate. Results showed that the reaction zone was quenched and broadened as the addition of $CO_2$ was increased. The emission of NOx in flue gas was decreased as decreasing temperature in reaction zone. It was also shown that the reaction was delayed by the cooling effect. As the addition of $CO_2$ was increased, the composition of CO in the flame zone was increased due to the increase of reaction rate by increasing mixing effect of oxidant/fuel at OER=0%, but the composition of CO was decreased by quenching effect at OER=50% and 100%.

Effect of oxygen distribution for hot spot and carbon deposition minimization in a methane autothermal reforming reactor

  • Lee, Shin-Ku;Bae, Joong-Myeon;Kim, Yong-Min;Park, Joong-Uen;Lim, Sung-Kwang
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.1996-2000
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    • 2008
  • In autothermal reforming reaction, oxygen to carbon ratio (OCR) and steam to carbon ratio (SCR) are significant factors, which control temperature and carbon deposition into the reactor. The OCR is more sensitive than the SCR to affect the temperature distribution and reforming efficiency. In conventional operation, hydrocarbon fuel, steam, and oxygen was homogeneously mixed and injected into the reactor in order to get hydrogen-rich gas. The temperature was abruptly raised due to fast oxidation reaction in the former part of the reactor. Deactivation of packed catalysts can be accelerated there. In the present study, therefore, the effect of the oxygen distribution is introduced and investigated to suppress the carbon deposition and to maintain the reactor in the mild operating temperature (e.g., $700{\sim}800^{\circ}C$). In order to investigate the effect numerically, the following models are adopted; heterogeneous reaction model and two-medium model for heat balance.

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Experimental Studies on the Efficiency of Insamyunpye-Hwan (인삼윤폐환(人蔘潤肺丸)의 효능(效能)에 관(關)한 실험적(實驗的) 연구(硏究))

  • Rhee, Hyung-Koo
    • Korean Journal of Oriental Medicine
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    • v.2 no.1
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    • pp.314-326
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    • 1996
  • Experimental studies were done to research the clinical effect of Insamyunpye-H wan on viscousity of mucin solution, pulmonary thromboembolism, oxygen consumption in $O_3$-exposed and Lung TBA in rats and mice. The result was obtained as follows : 1. In the effect of viscosity sampled from mucin, Insamyunpye-Hwan was revealed to have a significant effect of decrease in the rate of viscousity (p<0.01). 2. In the effect of sodium aracdonic acid induced pulmonary thromboembolism, I samyunpye-Hwan was revealed to have an effect of increasing the number of survival, but were not significant 3. In the effect of ADP induced pulmonary thrornboembolism, Insamyunpye-Hw an was revealed to have an effect of increasing the number of survival, but were not significant 4. In the effect of oxygen cansumption values in rats exposed-$O_3$, Insarnyunpye-Hwan was revealed to have a significant effect (p<0.05). 5. In the effect of the lung TBA values in rats exposed-$O_3$, Isamyunpye-Hwan was revealed to have a significant effect (p<0.05). In connection with the results of the studies, Insamyunpye-Hwan is concluded to be effective on the treatment of cough and lung and respiratory organ damages.

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