• Title, Summary, Keyword: Coke

Search Result 254, Processing Time 0.035 seconds

Carbon Deposition on Nickel Catalyst for Pre-reforming of Propane (니켈 촉매를 이용한 프로판 예개질 반응의 탄소침적에 대한 연구)

  • Kim, Sun-Young;Bae, Joong-Myeon
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.487-490
    • /
    • 2008
  • Temperature programmed oxidation (TPO) is used to characterize coke species deposited on commercial nickel catalyst, C11-PR during propane pre-reforming. Propane pre-reforming performed under various condition, S/C from 1.5 to 2.5 and temperature from $350^{\circ}C$ to $450^{\circ}C$. There are three kinds of coke species detected by TPO: (i) reactive coke, (ii) coke deposited on metal site and (iii) coke deposited on acid support. Coke deposited on metal and support are minimized although reactive coke is generated at temperature of $400^{\circ}C$ and S/C of 2.0. Reactive coke is expected to remove easily below temperature of $200^{\circ}C$. Therefore, optimized pre-reforming condition for propane is $400^{\circ}C$ and S/C of 2.0.

  • PDF

A combustion control modeling of coke oven by Swarm-based fuzzy system (스왐기반 퍼지시스템을 이용한 코크오븐 연소제어 모델링)

  • Ko, Ean-Tae;Hwang, Seok-Kyun;Lee, Jin-S.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.493-495
    • /
    • 2005
  • This paper proposes a swarm-based fuzzy system modeling technique for coke oven combustion control diagnosis. The coke plant produces coke for the blast furnace plant in steel making process by charging coal into oven and supplying gas to carbonize it. A conventional mathematical model for coke oven combustion control has been used to control the amount of gas input, but it does not work well because of highly nonlinear feature of coke plant. To solve this problem, swarm-based fuzzy system modeling technique is suggested to construct a diagnosis model of coke oven combustion control. Based on the measured input-output data pairs, the fuzzy rules are generated and the parameters are tuned by the PSO(Particle Swarm Optimizer) to increase the accuracy of the fuzzy system is operated. This system computes the proper amount of gas input taking the operation conditions of coke oven into account, and compares the computed result with the supplied gas input.

  • PDF

Effect of Hydrogen Ratio and Tin Addition on the Coke Formation of Platinum Catalyst for Propane Dehydrogenation Reaction (프로판 탈수소화 반응용 백금촉매의 코크 생성에 미치는 수소비와 주석첨가의 영향)

  • Kim, Soo Young;Kim, Ga Hee;Koh, Hyoung Lim
    • Clean Technology
    • /
    • v.22 no.2
    • /
    • pp.82-88
    • /
    • 2016
  • The loss of activity by coke is an important cause of catalyst deactivation during industrial operation. In this study, hydrogen ratio of reaction condition, which has influenced on coke formation over Pt-Sn catalyst, and regeneration of catalysts activity by coke burning, Pt sintering of coke burning as coke contents, effects of coke formation and deactivation with different Sn contents were confirmed. Pt-Sn-K catalyst supported on θ-alumina and γ-alumina was prepared progressively. Activity of regenerated catalyst for propane dehydrogenation was compared with fresh catalyst by coke burning, after propane dehydrogenation was carried out with different hydrogen ratio at 620 ℃ on fresh catalyst. Regenerated catalyst’s physical characterization such as BET, coke analysis and XRD was investigated. Through catalytic activity test and characterization, Sn contents of catalyst and hydrogen ratio in feed stream could affect coke formation on catalyst surface. Excessive coke makes loss of activity and Pt sintering during air regeneration process.

Influence of kneading ratio on the binding interaction of coke aggregates on manufacturing a carbon block

  • Kim, Jong Gu;Kim, Ji Hong;Bai, Byong Chol;Choi, Yun Jeong;Im, Ji Sun;Bae, Tae-Sung;Lee, Young-Seak
    • Carbon letters
    • /
    • v.28
    • /
    • pp.24-30
    • /
    • 2018
  • Coke aggregates and carbon artifacts were produced to investigate the interactions of coke and pitch during the kneading process. In addition, the kneading ratio of the coke and binder pitch for the coke aggregates was controlled to identify the formation of voids and pores during carbonization at $900^{\circ}C$. Experiments and thermogravimetric analysis revealed that carbon yields were improved over the theoretical yield calculated by the weight loss of the coke and binder pitch; the improvement was due to the binding interactions between the coke particles and binder pitch by the kneading process. The true, apparent, and bulk densities fluctuated according to the kneading ratio. This study confirmed that an excessive or insufficient kneading ratio decreases the density with degradation of the packing characteristics. The porosity analysis indicated that formation of voids and pores by the binder pitch increased the porosity after carbonization. Image analysis confirmed that the kneading ratio affected the formation of the coke domains and the voids and pores, which revealed the relations among the carbon yields, density, and porosity.

Effect of coal blending ratio on CO2 coke gasification

  • Kim, Jin-Ho;Kim, Gyeong-Min;Lisandy, Kevin Yohanes;Jeon, Chung-Hwan
    • Korean Journal of Chemical Engineering
    • /
    • v.34 no.11
    • /
    • pp.2852-2860
    • /
    • 2017
  • Coke gasification is largely influenced by the raw coal, catalyst, and blending ratios, pore structure, and specific surface area of the raw coal. In this study, several properties of cokes related to their reactivity were measured using coke reactivity test apparatus (CRTA), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Brunauer-Emmet-Teller (BET) surface area analysis, and energy dispersive X-ray spectroscopy (EDS) to investigate the characteristics of coke gasification. The results indicated that the reactivity of coke in the temperature range from 950 to $1,050^{\circ}C$ was affected by the type of coke and its specific surface area rather than the general properties of the coke, although the overall reactivities at the other temperatures were uniform. EDS analysis showed that the catalyst acted on the reactivity of cokes at low temperatures, whereas the BET analysis indicated that the reactivity at high temperature was influenced by the specific surface area.

Development of center position control system for travelling machines using image processing (영상인식을 이용한 이동기기 정 중심확인 시스템 개발)

  • 최일섭;전종학
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.1484-1487
    • /
    • 1996
  • An Automatic coking control system was developed to achieved substantial energy and labor savings through the stabilization and optimization of coke oven operation. With the aim of saving energy and labor, the coke department has been advanced automation and systematization. A typical examples of automation is Center Position Control System(CPCS) for coke oven. This system is proved effective in improvement of center position accuracy.

  • PDF

Structural Changes During the Calcination of Raw Coke (Raw Coke의 하소온도에 따른 구조변화)

  • 염희남;장진석;이종민;정윤중
    • Journal of the Korean Ceramic Society
    • /
    • v.29 no.10
    • /
    • pp.773-778
    • /
    • 1992
  • The effect of temperature on the structural changes of petroleum raw coke during calcination was studied and then the properties of carbon solids prepared from those calcined coke using binder were examined. The notable structural change of raw coke was observed in the range from 800$^{\circ}C$ to 900$^{\circ}C$ from the results of volatile matter, porosity, X-ray diffraction and scanning electron microscopy. The bending strength, density of the carbon solid carbonized at 1400$^{\circ}C$ was 400 kg/$\textrm{cm}^2$ and 1.40g/㎤, respectively.

  • PDF

Influence by Preheat-Treatment on Raw Coke in Fabrication of Carbon Solids (탄소재 제조에 있어서 Raw Coke의 전처리의 영향)

  • 염희남;황인수;이종민;정윤중
    • Journal of the Korean Ceramic Society
    • /
    • v.31 no.1
    • /
    • pp.97-103
    • /
    • 1994
  • The influence of ground petroleum coke, preheat-treated at temperatures ranged of 150~35$0^{\circ}C$, was studied. It has been found that the coke powder preheat-treated at the temperature of 175$^{\circ}C$ has been spherical-shaped in grinding and have showed the highest strength and density in sintering. The coke powder was also the best for the binding force and the (H/C) values showed 0.45 at the above temperature.

  • PDF

Energy conversion of petroleum coke : CO2 gasification (석유 코크스의 에너지 전환 : CO2 가스화)

  • Kook, Jin-Woo;Gwak, In-Seop;Lee, See-Hoon
    • 한국연소학회:학술대회논문집
    • /
    • /
    • pp.255-257
    • /
    • 2014
  • The installation of light oil facilities or delayed cokers seems to be inevitable in the oil refinery industry due to the heavy crude oil reserves and the increased use of light fuels as petroleum products. Petroleum coke is a byproduct of oil refineries and it has higher fixed carbon content, higher calorific value, and lower ash content than coal. However, its sulfur content and heavy metal content are higher than coal. In spite of disadvantages, petroleum coke might be one of promising resources due to gasification processes. The gasification of petroleum coke can improve economic value of oil refinery industries by handling cheap, toxic wastes in an environment-friendly way. In this study, $CO_2$ gasification reaction kinetics of petroleum coke, various coals and mixing coal with petroleum coke have investigated and been compared by using TGA. The kinetics of $CO_2$ gasification has been performed with petroleum coke, 3 kinds of bituminous coal [BENGALLA, White Haven, TALDINSKY], and 3 kinds of sub-bituminous coal [KPU, LG, MSJ] at various temperature[$1100-1400^{\circ}C$].

  • PDF

New insights about coke deposition in methanol-to-DME reaction over MOR-, MFI- and FER-type zeolites

  • Migliori, Massimo;Catizzone, Enrico;Aloise, Alfredo;Bonura, Giuseppe;Gomez-Hortiguela, Luis;Frusteri, Leone;Cannilla, Catia;Frusteri, Francesco;Giordano, Girolamo
    • Journal of Industrial and Engineering Chemistry
    • /
    • v.68
    • /
    • pp.196-208
    • /
    • 2018
  • The effect of channel-system of zeolite on methanol-to-DME reaction was studied. Results revealed that channels size and topology affect catalyst lifetime, type and location of coke precursors. FER and MFI showed the best resistance towards coke deposition, whilst fast deactivation was observed on MOR. Although the higher concentration and strength of acid sites, FER structure formed a lower coke amount, preferably located within the pores, while coke cluster deposited on the external surface of MOR. Analysis of acid sites distribution and strength was performed during deactivation-regeneration process. Coke location assessment was also supported by molecular simulations.