• Title/Summary/Keyword: Furnace Analysis

Search Result 692, Processing Time 0.026 seconds

Development of Integrated Design and Optimization Software for the High Temperature Furnace Design (초고온 진공로 통합설계 최적화 소프트웨어 개발)

  • Jin, YuXuan;Lee, Jaewoo;Byun, Yunghwan
    • Journal of the Korean Society of Systems Engineering
    • /
    • v.1 no.1
    • /
    • pp.14-19
    • /
    • 2005
  • High temperature vacuum furnaces or high standard electric furnaces demand high technology level and high production cost. Therefore, an iterative design process and the optimization approach under integrated computing environment are required to reduce the development risk. Moreover, it also required to develop an integrated design software that can manage the centralized database system between factory and design department, and the automated furnace design and analysis. The developed software is dedicated to the development of the vacuum (electric) furnaces. Based on the distribute middleware system, the GUI module, the CAD module, the thermal analysis module and the optimization module are integrated. For the DBMS, Microsoft Access is employed, the GUI is developed using Visual Basic language, and AutoCAD is utilized for the configuration design. By investigating the analysis code interface, the analysis and optimization process, and the data communication method, the overall system architecture, the method to integrate the optimizer and ana lysis codes, and the method to manage the data flow are proposed and verified through the optimal furnace design.

  • PDF

Application of adaptive controller using receding-horizon predictive control strategy to the electric furnace (이동구간 예측제어 기법을 이용한 적응 제어기의 전기로 적용)

  • Kim, Jin-Hwan;Huh, Uk-Yeol
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.2 no.1
    • /
    • pp.60-66
    • /
    • 1996
  • Model Based Predictive Control(MBPC) has been widely used in predictive control since 80's. GPC[1] which is the superset of many MBPC strategies a popular method, but GPC has some weakness, such as insufficient stability analysis, non-applicability to internally unstable systems. However, CRHPC[2] proposed in 1991 overcomes the above limitations. So we chose RHPC based on CRHPC for electric furnace control. An electric furnace which has nonlinear properties and large time delay is difficult to control by linear controller because it needs nearly perfect modelling and optimal gain in case of PID. As a result, those controls are very time-consuming. In this paper, we applied RHPC with equality constraint to electric furnace. The reults of experiments also include the case of RHPC with monotonic weighting improving the transient response and including unmodelled dynamics. So, This paper proved the practical aspect of RHPC for real processes.

  • PDF

Analysis on the Temperature Distribution for the Billet in a Furnace (가열로내 피열재의 온도분포 해석)

  • Kwon, O.B.;Kim, M.K.;Chang, K.Y.;Kwon, H.C.;Bae, D.S.
    • Journal of Power System Engineering
    • /
    • v.8 no.2
    • /
    • pp.24-30
    • /
    • 2004
  • In this paper, the optimal heating pattern of the furnace is sought to reduce the unnecessary energy loss. A finite difference method was used to estimate the transient temperature field of the billet in a furnace. Heat conduction equations were used in the interior nodes of the billet, while energy balances for conduction, convection, and radiation were considered in the boundary nodes. Several heating patterns for the furnace were tested and subsequently compared each other. The results showed that the temperature in the preheating zone should be set to relatively low. The temperature distributions of the billet are quite different from each other when different heating pattern are used, even though the heating patterns have the same amount of energy consumption. It reveals that there exists an optimal heating pattern to save the energy loss.

  • PDF

Thermal Instability of Natural Convection in a Glass Melting Furnace (유리 용융로에서 자연대류의 열적 불안정성)

  • Lim, Kwang-Ok;Lee, Kwan-Soo
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.22 no.12
    • /
    • pp.1774-1783
    • /
    • 1998
  • The transition from steady laminar to chaotic convection in a glass melting furnace specified by upper surface temperature distribution has been studied by the direct numerical analysis of the two and three-dimensional time dependent Navier-Stokes equations. The thermal instability of convection roll may take place when modified Rayleigh number($Ra_m$) is larger than $9.71{\times}10^4$. It is shown that the basic flows in a glass melting furnace are steady laminar, unsteady periodic, quasi-periodic or chaotic flow. The dimensionless time scale of unsteady period is about the viscous diffusion time, ${\tau}_d=H^2/{\nu}_0$. Through primary and secondary instability analyses the fundamental unsteady feature in a glass melting furnace is well defined as the unsteady periodic or weak chaotic flow.

Drying shrinkage and Pore Structure of Blast Furnace Slag Concrete Mixed Alkaline Stimulation (알칼리 자극제 혼입 고로슬래그 콘크리트의 건조수축과 공극구조)

  • Park, Ji-Woong;Lee, Gun-Cheol;Gao, Shan
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2016.10a
    • /
    • pp.32-33
    • /
    • 2016
  • This purpose of this study is to find the properties of pore structure and length change of blast furnace slag cement added alkali powder stimulant on shrinkage reducing agent presence. In length change, the specimen added alkaline stimulant was smaller than normal blast furnace slag concrete. And the specimen added shrinkage reduction agent was confirmed to show smaller rate of length change than the length. In MIP analysis of 1day-age, 0.1㎛ subsequent pore amount of the specimen added alkaline stimulant was significantly smaller value the normal blast furnace slag concrete specimen.

  • PDF

Analysis of effects of the arc-funace on the power system from the viewpoint of voltage regulation (전압변동 측면에서 본 아크로 부하가 전력계통에 미치는 영향 검토)

  • Park, Hyun-Taek;Kim, Jae-Chul;Park, Kyoung-Ho;Im, Sang-Gug
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2004.05a
    • /
    • pp.366-369
    • /
    • 2004
  • Arc-furnace is one of the large loads in the electric power system. When the arc-furnace operates, it may cause a bus voltage fluctuation in the power system, because it consumes a lot of reactive power. In this paper, we simulated this phenomenon by using a PSAF program with on-site measured arc-furnace load. The simulated results show that the fluctuation of bus voltage adjacent the arc-furnace was varied from $4.3%{\sim}7.8%$ the normal voltage because of reactive power consumption by arc-furnace. Therefore, we expect this study will come into use as the basic information on the probability of the demand control

  • PDF

Analysis of effects of the arc-funace on the power system Considering the toad pattern of arc-funace (아크로 부하패턴을 고려한 전력계통 전압변동 분석)

  • Park Hyun Taek;Kim Jae Chul;Son Hak Sig;Kug Im Sang;Oh Dong hwan
    • Proceedings of the KIEE Conference
    • /
    • summer
    • /
    • pp.295-297
    • /
    • 2004
  • Arc-furnace is one of the large loads in the electric power system. When the arc-furnace operates, it may cause a bus voltage fluctuation in the power system, because it consumes a lot of reactive power. In this paper, we simulated this phenomenon by using a PSAF program with on-site measured arc-furnace load. The simulated results show that the fluctuation of bus voltage adjacent the arc-furnace was varied from $4.3\%\sim7.8\%$ the normal voltage because of reactive power consumption by arc-furnace. Therefore, we expect this study will come into use as the basic information on the probability of the demand control

  • PDF

Analysis of the Insulation Resistance Trend according to the Installation Environment of the Electric Wiring of the Melting Furnace (용해로 전기배선의 설치환경에 따른 절연저항 추이 분석)

  • Suk Bong Ko;Doo-Hyun Kim;Sung-Chul Kim
    • Journal of the Korean Society of Safety
    • /
    • v.38 no.2
    • /
    • pp.15-22
    • /
    • 2023
  • In this study, the process and the environment of a melting furnace, located in Workplace A in Chungnam Province was inspected, and the insulation resistances of electrical circuits and motors were measured, and their changes over five years (2017-2021) were analyzed. It was found that the exhaust fan, oil pumps #A and #B, and heater were installed in 2010. Their insulation resistances decreased from 2017. Specifically, the insulation resistance of Oil Pump #A decreased from 100 (㏁) in 2018 to 20(㏁) in 2021, an 80% reduction. The fast decrease in insulation resistance was due to the high temperature of the melting furnace affecting surrounding the electrical facilities. A safety management scheme on the electrical facility of the melting furnace was proposed.

THE ANALYSIS OF EFFLUENT GAS FROM ETHYLENE FURNACE BY NEAR-INFRARED SPECTROSCOPY

  • Lee, Joon-Sik;Kim, Jeong-Hyen;Cho, In-Ho
    • Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
    • /
    • 2001.06a
    • /
    • pp.1192-1192
    • /
    • 2001
  • Usually there are many furnaces in a ethylene plant and the performance of total furnaces can be improved if that of each furnace is monitored and controlled. For this purpose real-time data for the effluent of each furnace is necessary. However, it is very difficult to analyze the total effluent stream of a ethylene furnace by real-time because it is composed of so many components including heavy hydrocarbons. Fortunately, component data for lighter hydrocarbons is much more important than that of heavier ones for ethylene furnace. In ordinary case, the on-line measurement of light hydrocarbons is performed by on-stream gas chromatography, after separating gas-phase part from effluent. The main and important components of gas-phase are Methane, Ethane, Ethylene, and Propylene. If we can use Near-infrared spectroscopy for measuring those components within good reproducibility, shorter analysis time, better repeatability, easier maintenance and lower cost will make Near-infrared (NIR) analyzer replace on-stream gas chromatography in this process. Although it is known to be very difficult to measure gas components because of very weak absorption in Near-infrared region, we have studied the feasibility of the application of NIR for the measurement of gas-phase hydrocarbon in the effluent of ethylene furnace. The samples were obtained from actual process and NIR spectra were collected over 1100 to 2500nm range. NIR spectra and calibrations showed and demonstrated the possibility of extending NIR spectroscopy to the measurement of gas-phase hydrocarbon in the effluent of ethylene furnace.

  • PDF

Analytical Estimation of the Performance of Marine Concrete with Mineral Admixture (광물질 혼화재를 혼합한 해양 콘크리트의 해석적 성능 평가)

  • Lee, Bang-Yeon;Kwon, Seung-Jun;Kang, Su-Tae
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.3 no.4
    • /
    • pp.301-306
    • /
    • 2015
  • For the purpose of developing high performance marine concrete with improved crack resistance and durability, this analytical study aimed to estimate strength, hydration heat characteristics, and chloride attack resistance of concrete with mineral admixture. Ground granulated furnace slag and fly ash were considered for mineral admixture. The replacement of ground granulated furnace slag and fly ash considered in the analysis was in the range of 0~70% and 0~40 %, respectively. The analysis results indicated that both ground granulated furnace slag and fly ash decreased compressive strength, and the effect of adding ground granulated furnace slag on mitigation of hydration heat was limited whereas fly ash had an noticeable influence on it. It was also found that the replacement with ground granulated furnace slag enhanced the chloride attack resistance but fly ash deteriorated the resistance. From the analytical studies, It could be expected that a ternary blended cement composition with proper amount of ground granulated furnace slag and fly ash might be effective to control crack resistance as well as chloride attack resistance of marine concrete.