• Title/Summary/Keyword: furnace design

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Numerical Analysis of Molten Aluminum Furnace Considering Natural Convective Heat Transfer (자연대류 열전달을 고려한 Al 용탕 보온로의 수치해석)

  • Park S. S.;Kim B. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.107-110
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    • 2004
  • Application of aluminum alloy has been increasing for most of industry area because aluminum has a good mechanical properties and castability, especially automotive field for weight reduction. But, Furnace industry is sluggish. The purpose of this study is numerical analysis of aluminum holding furnace for reasonableness estimation when we design for new model of furnace. The numerical simulation involving fluid flow of inside air and heat transfer to fireproof material is presented in order to improve the understanding of aluminum furnace. First of all, we are carried out numerically for the two dimensional inside convection and surface radiation heat transfer in a square enclosure. Subsequently, we are established the analysis method of aluminum furnace considering natural convective heat transfer

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A Study on the Temperature Control of a TV-Glass Melting Furnace Using the Conventional Advanced Control (고전고급제어(Conventional Advanced Control)를 이용한 TV 브라운관 유리 용해로의 온도제어에 관한 연구)

  • Moon, Un-Chul;Kim, Heung-Shik
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.9
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    • pp.822-830
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    • 2000
  • A conventional advanced control algorithm is proposed in this paper for improved temperature regulation of a TV-glass melting furnace. The TV-Glass melting furnace is a typical MIMO(Multi-Input Multi Output) system which is subject to various thermal disturbances. Because of its complexity, a detailed mathematical model of the furnace is hard to establish. To design a temperature control control system of the furnace, major input-output variables are selected first, and simple FOPDT(First Order Plus Dead Time) models are established based on the physical meaning and experimental process data. Based on the FOPDT models, a multi-loop control system composed of cascade and single loops are designed for effective control of the MIMO system. Practical implementation on the 150 ton/day furnace using the DCS(Distributed Control System) showed that the proposed control technique performs better than manual control.

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Thermal Stress Analysis of Spent Fuel Vol-oxidizer Furnace on the Internal Pressure (내부 압력변화에 대한 사용후핵연료 분말화장치 가열로의 열 응력 해석)

  • Kim, Y.H.;Jung, J.H.;Hong, D.H.;Park, B.S.;Lee, J.K.;Yoon, J.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.136-140
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    • 2006
  • We are developing a vol-oxidizer which transforms the spent $UO_2$ pellets into the $U_3O_8$ power through oxidizing process. The vol-oxidizer consists of furnace, filter, heater and valve etc. When the filter is blocked by the powder, the internal pressure of the furnace is increased owing to the air flow restriction. Then, the furnace vessel is swelled and deformed by it. In this paper, we proposed a procedure of the thermal analysis for furnace vessel design of spent fuel vol-oxidizer. In this work, we determined the thickness of the furnace through analyzing the internal pressure and the thermal stress of the furnace with respect to various pressure and temperature. To analyze the thermal stress, we used ANSYS 8.0 for constructing a FEM model of the furnace, and then analyzed it based on the ASME code. We also surveyed the material property and yield stress of SUS304 with various temperature. Analysis results are compared with the yield stress of the material. We manufactured the furnace and conduct the verification experiments.

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A Study on the Design of Filter Assembly Automation System (Filter 조립 자동화 시스템 설계에 관한 연구)

  • Kim, Hong-Gun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.6
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    • pp.111-117
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    • 2008
  • An automation process of filter unit is presented for the application of the assembling procedure and dry furnace work. By that automation procedure, it is expected to enhance working environment such as reducing laboring load, harmful gas, and burning scald. Furthermore, this automation process also minimizes via standardization of manufacturing process so that it may increase productivity and reliability. An automation process of filter unit is presented for the application of the assembling procedure and dry furnace work. Filter automation process also gives a good quality and productivity by simplifying to only one line from the complicated process such as filter cutting$\rightarrow$ adhering$\rightarrow$fabricating in a very small space. It is found that a new conceptual design of dry furnace shows the better quality like uniform heat distribution compared to the conventional design. It is also found that the present design gives a better working environment by adding cooling system.

Comparison of X-ray Shielding Performance according to the Weight of unit volume of Heavy Weight Concrete Utilizing Electric Arc Furnace Oxidizing Slag. (전기로 산화슬래그 골재를 활용한 중량 콘크리트의 단위 용적 중량 변화에 따른 X-선 차폐 성능 비교)

  • Lim, Hee Seob;Lee, Han Seung;Choi, jae Seok
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.35-36
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    • 2013
  • Electric arc furnace oxidizing slag from massively produced steel slag has been used in road bases and subbases, hot mix asphalt, and landfill. Electric arc furnace oxidizing slag contains iron (15%~30%) and has a high density of 3.0~3.7 ton/m3. Depending on the type and amount of concrete aggregates, the radiation-shielding characteristics can vary. Therefore, aggregates of electric arc furnace oxidizing slag can be considered for the production of radiation-shielding concrete. The experimental design of this study is experiments on Compressive strength experiments, X-ray irradiation experiments, and experiments related to the unit volume weight were carried out on hardened concrete. This experiment compared the performance evaluation of radiation shielding of concrete using electric arc furnace oxidizing slag.

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A Design of a Screen Monitoring Controller for the Electric Furnace Temperature Control (전기로 온도제어를 위한 화면감시 제어기 설계)

  • 오진석
    • Journal of the Korean Society of Safety
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    • v.12 no.2
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    • pp.80-86
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    • 1997
  • In this paper, a temperature controller with monitor function is proposed for the electric furnace system. This controller includes holding and ramp control function, and the control program for the temperature process monitor of the electric furnace. For this purpose, the implementation and performance of auto tuning algorithms in a computer-based controller was studied in relation to the control of nonlinear electric furnace system which is characterized with large delay time. The control program for this controller programmed by c-language. To communicate a control and detection signals, between the controller and the electric furnace is implemented by the I/O data card. We apply the temperature controller to the practical electric furnace. As a result, the proposed controller shows the better status characteristic.

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Modeling of Combustion in Co-Generation / Industrial Boiler Furnace (열병합/산업용 보일러 화로에서의 연소 해석)

  • Kim, Byoung-Yun;Park, Pu-Min;Lee, Kyoung-Mo
    • Proceedings of the KSME Conference
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    • 2001.11b
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    • pp.842-846
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    • 2001
  • Our company produces boilers for industrial usages or power plants. The aim of this study is to investigate the flame structure, heat transfer to evaporator tube wall and NOx emission in the furnaces. Also we are to derive correct FEGT(Furnace Exit Gas Temperature) characteristic curve. When we design furnace and superheater, economizer etc. FEGT characteristic curve is very important factor for optimum design. We calculated turbulent reacting flow, heat transfer and NOx emission in furnace by using numerical modeling with the help of commercial code. Three dimensional steady state calculation is done. k-e turbulence model and equilibrium chemistry combustion model with $\beta-probability$ density function is used. To calculate radiation heat transfer discrete ordinates model is used. And we measured FEGT at several operating plants. Measurement is done by R-type thermocouple. Radiation shield is attached to the thermocouple to prevent radiation effect. Measured and calculated results show good agreement. And we could understand the flame structure and NOx formation positions in each furnaces.

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The Development of User Oriented CFD Program for Optimum Design of a Regenerative Combustion Furnace (축열 연소시스템의 최적화 구현을 위한 사용자 전용 해석 프로그램의 개발)

  • Kang, K.G.;Ryou, H.S.;Ryou, S.Y.;Kim, H.J.;Noh, D.S.
    • Journal of the Korean Society for Heat Treatment
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    • v.16 no.3
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    • pp.148-158
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    • 2003
  • In this study, a user oriented CFD program for optimum design of a regenerative combustion furnace, REBURN was developed. For user's convenience, user friendly Graphic User Interface was made and the renumbering interface program was developed in order to directly input any generated mesh system from ICEM CFD/FEA. Also an automatic processing system for switching mode was developed. The program was verified through compahng with commercial CFD code about regenerative combustion furnace. Then, numerical simulation of real walking beam furnace used in real industry was performed and the parametric analysis was studied about the arrangement mode. As a results, the uniform temperature was appeared in the cross mode.

A Numerical Analysis of Heat Transfer in Bright Annealing Furnace of Stainless Steel Strip (Strainless steel strip 광휘어닐링로 내의 열전달 해석)

  • Ryou, H.S.;Jeong, Y.T.;Jang, B.L.
    • Journal of the Korean Society for Heat Treatment
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    • v.22 no.4
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    • pp.228-233
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    • 2009
  • In order to predict the temperature distribution of stainless steel strip in Bright Annealing (BA) furnace, we performed the analysis of heat transfer and fluid flow using STAR-CCM+. The analysis model included unsteady fluid flow, heat transfer with radiation and moving grid. Two kinds of radiative properties, emissivity and reflectivity, were applied to the stainless steel strip, one is constant and the other is variable with time. As we call, the BA furnaces of stainless steel strip have two different types, muffle and no-muffle. The using of muffle type has been faced with some problems such as rising in material price and shortening of life cycle, etc. So the development of no-muffle type BA furnace is very important in order to save energy cost, lower environmental load and increase the productivity. The designed (or expected) temperature of stainless steel strip coming out of BA furnace was about $1065^{\circ}C$ while the environment temperature maintains around $1100^{\circ}C$. The result of our calculation was very close (or similar) to design temperature, and the application of radiative properties variable with time produced more accurate result than applying constant ones.