• Title/Summary/Keyword: Glass Melting Furnace

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Development of glass melting furnace using both plasma and combustion (플라즈마/연소 융합기술을 이용한 세라믹계 유리 분말 기중용해로 개발)

  • Dong, Sangkeun;Lee, Eunkyung;Jeong, Woonam
    • 한국연소학회:학술대회논문집
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    • 2014.11a
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    • pp.203-205
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    • 2014
  • This paper is suggesting about glass melting technology, using both plasma and combustion heat source. The mixed flame was formed to flow pattern of turning by plasma and combustion in melting zone. The burning time was extremely extended for vitrification of raw materials in melting zone, as a result, meting time was significantly reduced. This system was designed to smaller size than existing glass melting facilities. We had achieved to 30% energy saving, due to reduce residence time of melted materials inside furnace.

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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
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    • v.22 no.12
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    • pp.1774-1783
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    • 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.

A hybrid algorithm of fuzzy logic and conventional PI controller for the temperature control of glass melting furnace (유리 용해로 온도 제어를 위한 퍼지 로직과 PI 제어기의 복합형 제어 알고리듬)

  • Moon, Un-Chul;Kim, Heung-Shik;Park, Young-Moon
    • Journal of Institute of Control, Robotics and Systems
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    • v.4 no.2
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    • pp.215-219
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    • 1998
  • This paper presents a practical application of fuzzy logic control to temperature control of glass melting furnace. Due to the characteristics of glass melting furnace, a hybrid algorithm of conventional PI controller and fuzzy logic controller is proposed and discussed. Practical implementation results of the production furnace showed the effectiveness of the proposed control algorithm.

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Time-dependent natural convection in a glass melting furnace (유리용융로의 시간종속 자연대류)

  • Im, Gwang-Ok;Lee, Gwan-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.21 no.7
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    • pp.919-927
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    • 1997
  • The main purpose of this study is to determine bifurcation as the primary instability of a glass melting furnace. Steady-state and unsteady characteristics of natural convection in the partially open cavity as appeared in a glass melting furnace is investigated by using numerical analysis. Three types of convection, such as steady laminar, unsteady periodic or unsteady quasi-periodic convection may occur according to the temperature difference between upper two isothermal surfaces along the depth of cavity in a glass melting furnace. In the temperature difference of 150-900 K between batch and free surface, the larger the temperature difference, the weaker the convection strength and unsteadiness. Since the glass viscosity is increasing exponentially in the lower temperature, the batch freezes the thermofluidic field especially below the surface of it. If the depth of cavity is 0.5 m, the bifurcation to time-dependent natural convection may occur in the range of 60-650 K. If that is 1.0 m, it may occur in the whole range of temperature difference.

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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Natural convection induced by free surface heat flux and temperature difference between left and right walls in glass melting furnace (유리용융로에서 자유표면 열유속과 좌우벽면 온도차에 의한 자연대류)

  • Im, Gwang-Ok;Lee, Gwan-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.11
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    • pp.3706-3713
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    • 1996
  • A numerical study on natural convection induced by free surface heat flux and cold left and hot right walls in glass melting furnaces has been performed. A function of heat flux derived from the combustion environments of actual glass melting furnace is applied to thermal boundary condition at free surface. Fundamentally there exist two flow cells in cavity (left counterclockwise one and right clockwise one). The effects of heat flux and Rayleigh number are investigated through two-dimensional steady-state assumption. The convection strength of two flow cell located in left region continuously increases. In the mean time the strength of flow cell in right region increases and then decreases. Critical Rayleigh number in which two flow cells take place above and below show linear dependence on the free surface heat flux. To maintain the traditional flow pattern (left and right flow cells) in glass melting furnace, Rayleigh number is recommended to be below 10$^{5}$ .

Experimental study on combustion characteristics of oxy-fuel glass melting furnace (순산소를 이용한 유리 용해로의 연소특성에 관한 실험적 연구)

  • Kim, Se-Won;Ahn, Jae-Hyun;Kim, Yong-Mo;Shin, Myung-Chul
    • Journal of the Korean Society of Combustion
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    • v.9 no.1
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    • pp.1-10
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    • 2004
  • The results of a series of experiments executed by using two pilot-scale oxy-fuel burners are presented. The oxy-fuel burners are designed for maximum capacity of 50,000kcal/hr, 200,000kcal/hr and installed in the test furnace. The effects of turn-down ratio, excess oxygen ratio, nozzle exit velocity, injection angle, and swirl vane angle on the combustion characteristic are investigated. Temperature distributions are measured using R-type and Molybdenum sheathed C-type thermocouple at various points of the flame. The results showed that maximum temperature and mean temperature increase with the increase of turn-down ratio and momentum. The maximum flame temperature was increased about 35% compared to the case of equivalent air operated condition. In addition, optimum burner type, excess oxygen ratio and nozzle characteristics are obtained for this oxy-fuel glass melting furnace.

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A Stability Study of Rider Arch under the Increased Load of Checker Brick in Regernerator of the Reformed Glass Melting Furnace (유리 용해로 축열실 상재 하중 증가에 따른 Rider Arch의 안전성 검토)

  • Lee, Sun-Yung;Kim, Jong-Ock;Lim, Dae-Young;Kim, Taik-Nam;Park, Won-Kya
    • The Journal of Engineering Research
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    • v.2 no.1
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    • pp.125-131
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    • 1997
  • The regenerator is important part of the glass melting furnace to increase the temperature of the intake air through the combustion flame. The insulation, checker brick, prevention of the air leak has been studied to decrease the fuel consumption in glass melting industries. Thus the new types of checker brick and the design of the rider arch has been studied to prolong the life of the glass melting furnace. The height of the regenerator increased from 5.64 m to 7.89 m in the reforming of the glass melting furnace. Thus the stability of the rider arch is studied under the condition of increased load of checker brick in this research. The rider arch was estimated to be stable inspite of the increase of load according to the calculation. The max. sustained compressive stress of the rider arch is 163 kg/$cm^2$ and the max. sustained shear stress is 6.37 kg/$cm^2$.

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A Fault Diagnosis System of Glass Melting furnace Using A Fuzzy Export System (퍼지 전문가 시스템을 이용한 유리 용해로 이상 감시 시스템 구축 사례)

  • 문운철
    • Journal of Intelligence and Information Systems
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    • v.8 no.1
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    • pp.63-74
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    • 2002
  • This paper presents an application result of on-line fault diagnosis system for glass melting furnace using a fuzzy expert system. Operators maintain the furnace using the furnace Knowledge and experience, which directly influence the furnace and glass product. Firstly, knowledge and experience is achieved and analyzed to implement the furnace Knowledge and experience into fuzzy expert system. The acquired Knowledges determined as a crisp rule or a fuzzy rule to expect its characteristics. And, a linear regression is used as the input of fuzzy rule to consider the exact knowledge of human operator. The fuzzy expert system is implemented with G2 which is an on-line expert system tool of Gensym Co. The application to a production furnace of Samsung-Corning Co. in Suwon shows successful results of proposed fuzzy expert system.

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Efficient Method of fixing the Setting(4M standardization) in Melting furnace Operation (용해로 운전에서 Setting고정(4M 표준화)의 효율적 방안)

  • Jang, Do-Soo;Lee, Sae-Jae;Suh, Jung-Yul;Kim, I-Nam;Chung, Chong-Won;Cho, Jin-Hyung
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.30 no.1
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    • pp.96-104
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    • 2007
  • Glass melting process is influenced by both control and observation factors, where control factors include quantity and mixing ratio of raw material, the amount of fuel and air in-take. Further observation factors include temperature and pressure at each step of process inside glass melting furnace. Ambient Control is an effective means to eliminate complications from excessive variation among raw materials, or external disturbance from wide fluctuation of environment around equipments. Ambient Control uses both control and observation factors mentioned above. This study suggests an effective Proactive Control System that can enable genuine 4M standardization in glass melting furnace by applying Ambient Control.