• Title/Summary/Keyword: propane

Search Result 779, Processing Time 0.026 seconds

Study of Catalytic Performance of $La_{0.7}Sr_{0.3}Cr_{1-x}Ni_{x}O_{3}$ Perovskite for Steam Reforming of Propane ($La_{0.7}Sr_{0.3}Cr_{1-x}Ni_{x}O_{3-{\delta}$ Perovskite 촉매의 프로판 수증기 개질 반응에서의 특성 연구)

  • Kim, Jae-Ro;Kim, Nak-Hyeon;Sohn, Jung-Min
    • Korean Chemical Engineering Research
    • /
    • v.49 no.6
    • /
    • pp.715-719
    • /
    • 2011
  • The $La_{0.7}Sr_{0.3}Cr_{1-x}Ni_{x}O_{3}$(LSCN-x) perovskites were prepared by citric acid and EDTA using a sol-gel method. The LSCN-x was characterized by BET, XRD, SEM, $H_2$-TPR, EA and TEM. The catalytic performance of LSCN-x catalysts in steam reforming of propane in the temperature range 600~$800^{\circ}C$ was investigated. Propane conversion and hydrogen yield increased with an increase in the amount of added Ni up to x=0.5 in the B-site, denoted as LSCN-0.5, under S/C=1 and S/C=1.7 reaction conditions. The LSCN-0.5 catalyst exhibited the best performance under Ni-substitution of which propane conversion and hydrogen yield was 100%, 95.9% at $800^{\circ}C$ in the S/C=1.7 condition, respectively. The morphology of carbon deposited on the catalysts after reaction exhibited filamentous carbon and amount of carbon deposited on the catalysts after reaction increased with an increase in the amount of added Ni.

OH Radical Distribution and Sooting Characteristics in Co-Flow Diffusion Flames (동축류 확산화염의 OH 라다칼 분포 및 매연 특성)

  • Lee, Won-Nam;Song, Young-Hoon;Cha, Min-Suk
    • 한국연소학회:학술대회논문집
    • /
    • 1997.06a
    • /
    • pp.1-11
    • /
    • 1997
  • The soot and OH radical distributions have been experimentally studied in ethylene and propane laminar diffusion flames. The integrated soot volume fraction was measured along the centerline of a flame using a laser light extinction method. Planar laser light scattering and PLIF techniques are employed for the soot and OH radical distribution measurements utilizing Nd:YAG laser and OPO, FDO system. The concentration of OH radical is rapidly decreased at the edge of sooting region, which implies the importance of OH radical species on the soot oxidation process. For ethylene flames, the addition of air in fuel moves the OH radical distribution towards the center line of a flame at the soot oxidation region, while the concentration of OH radical remains relatively high at the soot formation region. The interaction between soot particles and OH radicals becomes more active with fuel-air at the soot oxidation region. For propane flames, however, any indication of the increased interaction between soot particles and OH radicals with fuel-air was not noticed.

  • PDF

The Dependency of CH* Chemiluminescence of a Laminar Premixed Flame on Fuel Types (연료에 따른 층류 예혼합화염의 CH* Chemiluminescence 신호특성 변화)

  • Lee, Won-Nam;Kang, Suk-Min
    • Journal of the Korean Society of Combustion
    • /
    • v.13 no.2
    • /
    • pp.14-22
    • /
    • 2008
  • The CH* chemiluminescence of premixed flames and their dependency on fuel types has been experimentally investigated on laminar methane and propane premixed flames. The measured chemiluminescence intensities are observed linearly proportional to the fuel flow rate, which could be interpreted as the CH* chemiluminescence signal is linearly proportional to the heat release rate under fuel lean conditions. The effect of equivalence ratio could be expressed by an exponential function as ${I_{CH*}}^{\propto}\;a_1\;{\exp}(b_1{\Phi})$, where $a_1\;=\;0.00054$ and $b_1\;=\;4.60$ for methane and $a_1\;=\;0.0056$ and $b_1\;=\;5.02$ for propane. Oscillating flames showed the temporal fluctuation of chemiluminescence intensity: however, the time averaged values are virtually identical to those of quiescent flames under the same fuel flow rate and equivalence ratio conditions. This observation suggests that there is no significant flame stretch effect on chemiluminescence intensity, in average values.

  • PDF

A Study on the Power Saving with the Use of LNG Cold Heat in a Cascade Refrigeration Cycle using Methane, Ethylene and Propylene as Refrigerants (메탄, 에틸렌 및 프로판 냉매를 활용한 다원 냉동 사이클에서 LNG 냉열을 활용한 동력 절감 방안에 대한 연구)

  • CHO, JUNGHO
    • Journal of Hydrogen and New Energy
    • /
    • v.31 no.3
    • /
    • pp.302-306
    • /
    • 2020
  • In this study, computer simulation works using PRO/II with PROVISION V10.2 have been performed for a cascade refrigeration cycle using methane, ethylene and propane as refrigerants. LNG cold heat was also utilized in order to save the compression powers for the ethylene and propane refrigeration cycles. It was concluded that about 77% of compression power can be saved by using LNG cold heat through the exchanging heat with refrigerants. We could also know that the cold heat price contained in 1 ton of LNG is 16,155 won.

Characteristics of methane non-premixed multiple jet flames (메탄 비예혼합 상호작용 화염의 특성)

  • Lee, Byeong-Jun;Kim, Jin-Hyun
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.1365-1370
    • /
    • 2004
  • It has been reported that if eight small nozzles are arranged along the circle of 40 $^{\sim}$ 72 times the diameter of single nozzle, the propane non-premixed flames are not extinguished even in 200m/s, In this research, experiments were extended to the methane flame. Nine nozzles were used- eight was evenly located along the perimeter of the imaginary circle and one at the geometric center. The space between nozzles, s, the exit velocity and the role of the jet from the center nozzle were considered. On the contrary to the propane non-premixed case, the maximum blowout velocity for the methane diffusion flame was achieved when small amount of fuel is supplied through the center nozzle and s/d equals around 21. In the laminar region, the flame attached at the center nozzle anchored the outer lifted flames.

  • PDF

Soot and PAH Formation in Counterflow Diffusion Flames of Ethylene-Propane (에틸렌/프로판 대향류 확산화염에서 PAH 와 매연의 생성특성)

  • Yoon, Seung-Suk;Lee, Sang-Min;Hwang, Jun-Young;Chung, Suk-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.26 no.6
    • /
    • pp.817-822
    • /
    • 2002
  • Sooting characteristics of counterflow ethylene/propane mixture flames have been experimentally studied to investigate the fuel structure effect on PHM and soot formation. Laser-induced incandescene and laser-induced fluorescene techniques were employed to measure soot volume fraction and polycyclic aromatic hydrocarbon (PAH) concentration, respectively. Importance of $C_{3-}$species on PAH growth as well as the H-abstraction-C$_2$ $H_2$addition (HACA) mechanism has been emphasized, considering that PAH growth rate is greater for with mixed fuel than fer pure fuel flames. It was also confirmed that HACA pathways are the dominant soot growth mechanism. A new PAH growth model including both $C_{2-}$ and $C_{3-}$growth mechanisms is proposed based on the experimental results.