• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Before operating the vacuum degassing apparatus for molten glass having passages for molten glass made of refractory material, the fuel must be combusted by a temperature rising burner, and the combusted gas is also passed through an exhaust pipe communicating with the upper end of the vacuum degassing vessel. Exhausted.
    公开号:KR19990072982A
    申请号:KR1019990006492
    申请日:1999-02-26
    公开日:1999-09-27
    发明作者:스기모또미쓰오；이노우에시게꾸니；이께따니다까시；구라따히로시；히라바라야스하루
    申请人:세야 히로미치；아사히 가라스 가부시키가이샤；
    IPC主号:
    专利说明:

    How to raise the temperature of vacuum degassing apparatus and vacuum degassing apparatus for molten glass {VACUUM DEGASSING APPARATUS FOR MOLTEN GLASS AND METHOD TO RISE VACUUM DEGASSING APPARATUS TEMPERATURE}
    This invention belongs to the technical field of the vacuum degassing apparatus for molten glass which removes foam | bubble from continuously supplied molten glass, and the method of raising the temperature of a vacuum degassing apparatus.
    In order to improve the quality of the glass article, a vacuum degassing apparatus has been used to remove bubbles generated in the molten glass before the molten glass melted in the melting tank is molded by the molding apparatus. Such a conventional vacuum degassing apparatus is shown in FIG. 5. The vacuum degassing apparatus 110 shown in FIG. 5 is used for the process in which the molten glass G in the dissolution tank 120 is vacuum degassed and continuously supplied to a shaping | molding process container (not shown). The vacuum-formed vacuum housing 112 has a vacuum degassing vessel 114 substantially horizontally contained therein, and also an uprising pipe 116 and a downfalling to extend vertically downwardly at both ends thereof. Has a pipe 118.
    The lower end of the rising pipe 116 is submerged in the molten glass G in the upstream pit 122 in communication with the dissolution tank 120. The upper end of the rise pipe is in communication with the vacuum degassing vessel 114. The molten glass G before the degassing is sucked into the vacuum degassing vessel 114 from the upstream pit 122. The lower end of the descending pipe 118 is submerged in the molten glass G in the downstream pit 124 in communication with a continuous molding processing container (not shown). The upper end of the down pipe is in communication with the vacuum degassing vessel 114. After degassing, the molten glass G is sucked out of the vacuum degassing vessel 114 and guided out of the downstream pit portion. In the vacuum housing 112, a thermal insulation material 130, such as a brick for thermal insulation, is formed around the vacuum degassing vessel 114, the rising pipe 116 and the lowering pipe 118 to cover these portions for thermal insulation. .
    The vacuum housing 112 may be a casing made of metal, such as stainless steel. The vacuum housing is discharged by a vacuum pump (not shown) to keep the inside of the vacuum degassing vessel 114 provided therein at a reduced pressure such as 1/20 to 1/3 atmosphere.
    The inlet temperature of the molding process container is limited to a specific temperature, such as a temperature in the range of 1,000 ° C to 1,300 ° C. As a result, the temperatures of the vacuum degassing vessel 114, the rising pipe 116 and the falling pipe 118 located upstream of the shaping vessel are limited to a temperature of 1,200 ° C. to 1,400 ° C. In the name of the applicant, JP-A-2221129 discloses an area in which the vacuum degassing vessel 114, the rising pipe 116 and the descending pipe 118 are in direct contact with the molten glass G and made of precious metals such as platinum and platinum alloys. It has been described. Specifically, the passage for the molten glass in the vacuum degassing vessel 114, the rising pipe 116 and the falling pipe 118 consists of a circular shell made of precious metals such as platinum and platinum alloys mentioned in JP-A-2221129. do.
    The use of precious metals in the vacuum degassing vessel 114, the rising pipe 116 and the falling pipe 118 involves various problems as well as excessive costs.
    Refractory materials, such as electroformed bricks, which are cheaper than precious metals, make up the vacuum degassing vessel 114, the rising pipes 116 and the lowering pipes 118, and also continuously degassing the molten glass as in the case of using precious metals, It has been proposed to cope with various problems caused by the use of.
    However, when the vacuum degassing vessel 114 is made of a refractory material such as an electroformed brick, the following problem arises.
    When starting to operate the vacuum degassing apparatus 110, the molten glass G is sucked from the upstream pit 122 into the vacuum degassing vessel 114 and downstream pit 124 through the descending pipe 118. It is required to be guided out of). The temperature in the area | region which serves as the passage for molten glass G needs to be raised preferentially at that time. Otherwise, it is difficult to obtain the flow required by the molten glass G because the viscosity of the molten glass G is raised or the molten glass G is solidified in the way down to the downstream pit portion.
    The conventional vacuum degassing vessel 114 made of noble metal preferentially raises the temperature in the region serving as a passage for the molten glass G by allowing current to flow by itself in the noble metal circular shell, thereby vacuum degassing apparatus 110. The round shell self-heats at the start of operation. On the other hand, when the vacuum degassing vessel 114, the rising pipe 116 and the falling pipe 118 are made of a refractory material such as an electroformed brick, it is difficult to apply energy to heat it.
    Although it has been proposed to provide a heating device such as an electric heater around the rising pipe 116 and the falling pipe 118 to heat the molten glass G, the temperature of the vacuum degassing vessel 114 raises itself. It is not sufficient to just use such a heating device as the heat source to make it. In particular, it is difficult to uniformly heat the vacuum degassing vessel 114, the rising pipe 116, and the falling pipe 118 to a temperature close to the temperature of the molten glass G. It is necessary to form a space in the heat insulating material 130 and to change the structure of the heat insulating material 130 to provide a heating device such as an electric heater therein, so that the vacuum degassing device 110 does not have a simple structure. Cause problems.
    An object of the present invention is for a molten glass having a molten glass vacuum degassing apparatus and a vacuum degassing vessel, a rise pipe and a down pipe having a passage for a molten glass made of refractory material by preferentially raising the temperature of the rising pipe and the falling pipe to a sufficient temperature before the introduction of the molten glass. It is to provide a method of controlling the temperature when operating the vacuum degassing apparatus to uniformly raise the temperature of the region of the vacuum degassing vessel, the rising pipe and the falling pipe in contact with the molten glass to a certain temperature near the molten glass temperature.
    The present invention communicates with the vacuum housing discharged to depressurize the inside, the vacuum degassing vessel provided in the vacuum housing to vacuum degassing the molten glass, the vacuum degassing vessel, and sucks the molten glass before degassing to vacuum the molten glass. By providing a vacuum degassing apparatus for a molten glass, comprising a rising pipe flowing into the vacuum degassing vessel and a down pipe which communicates with the vacuum degassing vessel and degassed the molten glass degassed from the vacuum degassing vessel. The rising pipe and the falling pipe have passages for molten glass made of refractory material therein, the temperature rising device is provided just before operating the vacuum degassing device, and the temperature rising device is provided at the lower end of the rising pipe and the falling pipe. And an exhaust pipe in communication with the upper end of the vacuum degassing vessel. ; Before operating the vacuum degasser, a temperature rise burner is used to burn the fuel, and the gas burned from the temperature rise burner is exhausted through the exhaust pipe to raise the temperature of the vacuum degassing vessel, the rise pipe and the down pipe. Let's do it.
    The present invention also provides a method of raising the temperature of a vacuum degassing vessel, a rising pipe and a falling pipe in a vacuum degassing apparatus for molten glass before operating the vacuum degassing apparatus, wherein the apparatus is discharged to depressurize the inside. Vacuum degassing vessel provided in the vacuum housing, vacuum degassing vessel provided in the vacuum housing to vacuum degassing the molten glass, rising pipe which sucks the molten glass before degassing and introduces molten glass into the vacuum degassing vessel, vacuum degassing A descending pipe in communication with the vessel to suck the degassed molten glass down from the vacuum degassing vessel, wherein the vacuum degassing vessel, the rising pipe and the descending pipe have passages for the molten glass made of refractory material therein, and Provides a temperature rise burner for burning, the temperature rise burner It is provided at the lower end of the steel pipe, and consists in a combustion gas through an exhaust pipe communicated to an upper end of the vacuum degassing vessel exhaust.
    It is desirable to change the oxygen concentration of the gas containing oxygen used to burn the temperature rise burner. It is preferable that the exhaust pipe comprises a ventilation controller consisting of a ventilation control burner for controlling the flow of the exhausted combustion gas and a damper for controlling the exhaust amount of the exhausted combustion gas.
    1 is a schematic cross-sectional view of a vacuum degassing apparatus for molten glass according to an embodiment of the present invention in a stable operation.
    FIG. 2 is a schematic cross-sectional view of the vacuum degassing apparatus shown in FIG. 1 at the time of temperature rise. FIG.
    3 is a flow chart showing an example of a temperature rise burner and a control flow of the temperature rise burner used in the vacuum degassing apparatus shown in FIG.
    4 is a schematic cross-sectional view of a vacuum degassing apparatus according to another embodiment at a temperature rise.
    5 is a schematic cross-sectional view of a conventional vacuum degassing apparatus.
    * Description of the main parts of the drawings *
    10 vacuum degassing apparatus 12 vacuum housing
    14 vacuum degassing vessel 16 rising pipe
    18: down pipe 20: melting vessel
    22: upstream pit portion 24: downstream pit portion
    30: heat insulating material 34: ventilation pipe
    36: lid 38, 40: temperature rise burner
    44: ventilation control burner 48: damper
    As shown in FIG. 1, in the vacuum degassing apparatus 10 for molten glass according to the present invention, the molten glass G is sucked from the upstream pit part 22 in communication with the melting vessel 20, and the molten glass Is introduced into the vacuum degassing vessel 14, the molten glass is vacuum degassed in the vacuum degassing vessel 14 in a reduced pressure state, and the molten glass is formed into a processing glass container and a bottle molding for plate glass such as a floating bath. It is used in the process, which is continuously supplied to the downstream pit portion 24 in communication with a molding processing apparatus (not shown) such as a processing container. The vacuum degassing vessel is basically composed of a vacuum housing 12, a vacuum degassing vessel 14, a rising pipe 16 and a falling pipe 18.
    The vacuum housing 12 acts as a pressure vessel to maintain hermeticity when depressurizing the interior of the vacuum degassing vessel. In the example shown, the vacuum housing is rectangular arcuate or shaped in an inverted U shape. As long as the material and structure provide the required sealing properties and the required strength, the material and structure of the vacuum housing 12 is not limited. The vacuum housing is preferably made of metal, in particular stainless steel.
    The vacuum housing 12 has its upper right area provided with a suction port portion 12c for depressurizing its interior with discharge. The vacuum housing 12 is discharged by a vacuum pump (not shown) and vacuums the interior thereof so that the pressure is provided in a substantially central portion therein at a specific pressure, such as 1/20 to 1/3 atm. Keep).
    The vacuum degassing vessel 14 is provided in the horizontal direction. The vacuum degassing vessel 14 has a left end in communication with the upper end of the rising pipe 16 and a right end in communication with the upper end of the falling pipe 18 so that both pipes extend vertically downward. The rising pipe 16 and the falling pipe 18 are provided to pass through the legs 12a and 12b of the vacuum housing 12 like a reverse U shape.
    The lower ends of the rising pipe 16 and the lower pipe 18 are downstream pit portions 24 in communication with the molten glass and shaping vessels (not shown) in the upstream pit portions 22 in communication with the melting vessel 20. It is immersed in the molten glass G inside.
    The vacuum degassing vessel 14 has suction port portions 14a and 14b formed in its upper region. The suction port portions 14a, 14b communicate with the interior of the vacuum housing 12, and the vacuum housing 12 is also discharged by a vacuum pump (not shown), such as a pressure of 1/20 to 1/30 atmospheres. The inside of the vacuum degassing vessel 14 is maintained at a specific reduced pressure.
    The space between the vacuum degassing vessel 14 and the vacuum housing 12 and the space between the rising and falling pipes 16 and 18 and the vacuum housing 12 are filled with a thermal insulation material 30 such as a thermal insulation brick. The outer peripheral surfaces of the ascending and descending pipes and the vacuum degassing vessel are covered by a thermal insulation method. The thermal insulation material 30 has a discharge passage formed in a certain area thereof so as not to interfere with the discharge.
    The vacuum degassing vessel 14 has a central portion of the upper end provided with a ventilation pipe 34 to pass through the heat insulating material 30 and the vacuum housing 12, so that the combustion gas out of the vacuum degassing vessel at the temperature rise time. To discharge. When the vacuum degassing apparatus 10 operates in a stable process, the ventilation pipe 34 is closed and sealed by the lid 36 to be kept at a specific depressurized state without interference.
    In the vacuum degassing apparatus 10 according to the present invention, the vacuum degassing vessel 14, the rising pipe 16 and the descending pipe 18 are all made of a refractory material such as an electroformed brick that is resistant to molten glass.
    In other words, since the passage for the molten glass G in direct contact with the molten glass G is made of such refractory material in the vacuum degassing apparatus 10, the price of the vacuum degassing apparatus is made of molten glass made of platinum or platinum alloy. It can be significantly reduced in comparison with the conventional device having a passage for the. As a result, the passage for the molten glass can be molded into any shape having any wall thickness, which not only provides a vacuum degassing apparatus 10 having a large capacity but also performs vacuum degassing treatment at a higher temperature. The use of such refractory materials minimizes the dissolution of the components of the refractory material into the molten glass as compared to ordinary fire bricks. Such elution can be ignored in normal cases.
    As long as the vacuum degassing vessel 14, the rising pipe 16 and the falling pipe 18 are formed in the extension shell, there is no particular limitation on the shape of such a member. Such members can be formed to have cross-sectional enhancements such as circular shapes and rectangular shapes.
    A typical example of a refractory material having good resistance to molten glass at high temperatures is a so-called electroformed brick that is cast into a specific shape after electrically dissolving the raw refractory material, but one example of the refractory material is not limited to the electroformed brick. Bonded bricks burned after pressure molding the raw refractory material are included in the example. Examples of refractory materials include zirconia (Al 2 O 3 -ZrO 2 -SiO 2 ) electroformed bricks, alumina (Al 2 O 3 ) electroformed bricks, high temperature zirconia (ZrO 2 ) electroformed bricks, zircon (ZrO 2- SiO 2 ) bonded brick, zircon alumina (Al 2 O 3 -ZrO 2 -SiO 2 ) bonded brick, high temperature alumina (Al 2 O 3 -SiO 2 ) bonded brick and chromium (Cr 2 O 3 -Al 2 O 3 -ZrO 2 ) It is a combined brick. One such example corresponds to a product made by Asahi Grass Co., Ltd. under the names ZB, MB, ZB-X950, ZR, ZM, CW and ZC, respectively.
    The following description relates to the case where the electroformed brick is used as a fireproof material.
    The stable process of the vacuum degassing apparatus 10 for molten glass according to the present invention will be described.
    Since the vacuum degassing vessel 14 is discharged by a vacuum pump (not shown) and kept at a reduced pressure to a specific pressure such as a pressure of 1/20 to 1/3 atm, the molten glass G is upstream pit. The vacuum degassing vessel 14 via the rising pipe 16 and the falling pipe 18 due to the pressure (atmospheric pressure) on the liquid surface in the portion 22 or the downstream pit 24 and the pressure difference in the vacuum housing 12. The molten glass is also sucked at and also depends on the difference between the molten glass G in the upstream pit 22 and the liquid surface of the molten glass in the downstream pit 24 from a high point of view. Flows outside of). In other words, the vacuum degassing vessel 14, the rising pipe 16 and the falling pipe 18 form a siphon arrangement.
    At the same time, the altitude difference between the liquid surface of the molten glass G in the vacuum degassing vessel 14 and the liquid surface of the molten glass G in the upstream pit 22 or downstream pit 24 is determined by the vacuum degassing vessel ( 14) Depends on my pressure The difference is from about 2.5 m to about 3.5 m, and the flow rate of the molten glass G flowing through the vacuum degassing apparatus 10 is determined by the viscosity of the molten glass G (determined by the temperature of the molten glass G). In addition, it is determined by the height difference between the liquid surface of the molten glass G in the upstream pit part 22 and the liquid surface of the molten glass in the downstream pit part 24.
    Since the vacuum degassing vessel 14 has its interior decompressed to a pressure of 1/20 to 1/3 atm, the bubbles contained in the molten glass G rise to the liquid phase surface and the inside of the vacuum degassing vessel 14 Easily broken at The vacuum degassing apparatus 10 removes bubbles from the molten glass G in the same manner.
    Since the viscosity of the molten glass G becomes lower at a higher temperature, it becomes easier to remove the bubbles in the molten glass G as the molten glass G has a higher temperature. In addition, since the molten glass G has higher fluidity at a higher temperature, the flow rate of the degassed molten glass G increases when passing through the vacuum degassing vessel 14.
    When starting the operation of the vacuum degassing apparatus 10 having such an arrangement, the inner surfaces of the vacuum degassing vessel 14, the rising pipe 16 and the falling pipe 18, that is, as passages for the molten glass G, are used. Its working area needs to be heated to a temperature close to the temperature of the molten glass, ie 1,200 ° C., preferably 1,350 ° C. ± 50 ° C., before introducing the molten glass G into the vacuum degassing apparatus 10. do.
    Figure 2 shows a schematic cross-sectional view of a vacuum degassing apparatus according to the present invention at a temperature rise.
    Prior to the process of the vacuum degassing apparatus 10, the vacuum degassing apparatus 10 is positioned above the upstream and downstream pit portions 22 and 24, and furthermore, of the rising pipe 16 and the descending pipe 18. The lower end is spaced apart from the liquid surface of the molten glass G in each upstream pit 22 and downstream pit 24. In addition, the molten glass G does not exist in the vacuum degassing vessel 14, the rising pipe 16, and the falling pipe 18. As shown in FIG. In such a state, the temperatures of the vacuum degassing vessel 14, the rising pipe 16 and the falling pipe 18 are raised to a temperature close to the temperature of the molten glass G.
    Although it is shown in FIG. 2 that the upstream pit 22 and the downstream pit 24 are substantially filled with molten glass G, the temperature raising process according to the invention is characterized by the upstream pit 22 and the downstream. It can be performed in a state in which the molten glass G is almost absent in the pit portion 24. As shown in FIG. 2, temperature rising burners 38 and 40 are provided near the lower ends of the rising pipe 16 and the lowering pipe 18, and the exhaust pipe 42 is the upper end of the vacuum degassing vessel 14. It is provided to communicate with. The burners and exhaust pipes form a temperature raising device for raising the temperature of the vacuum degassing vessel, the rising pipe and the falling pipe. The burner and the exhaust pipe are preferably not provided in a stable process, which is evident from FIG. 1 in which the vacuum degassing apparatus 10 according to the invention is shown in a schematic sectional view. In other words, the vacuum degassing apparatus 10 is lifted and the lower ends of the rising pipe 16 and the falling pipe 18 are molten glass G in each of the upstream pit 22 and the downstream pit 24, respectively. The burner and the exhaust pipe are preferably provided temporarily when spaced from the liquid surface of the.
    It is desirable to change the oxygen concentration of the gas containing oxygen used by the temperature rise burners 38 and 40 to burn. In this case, oxygen is added to the air by the oxygen adding device to produce an oxygen containing gas having a higher oxygen concentration than the air, and such oxygen containing gas is supplied to the burner for combustion. The oxygen concentration can be arbitrarily changed by adjusting the amount of oxygen added to the air by the oxygen adding device. Certain embodiments of temperature rise burners 38 and 40 will be described below.
    When combustion is performed using ordinary air, such as an oxygen containing gas, the upper limit of the combustion temperature is about 1,200 ° C. When combustion is performed with oxygen added as described above, the upper limit of the combustion temperature is 2,000 ° C or lower. When the temperature of the vacuum degassing apparatus 10 rises, the vacuum degassing vessel 14, the rising pipe 16 and the falling pipe 18 need to be heated to a temperature close to the temperature of the molten glass G. That is, it preferably requires heating to about 1,200 ° C, preferably 1,350 ° C ± 50 ° C. In the former case, the predetermined temperature is achievable by burning with normal air used as described above. In the latter case, the combustion temperature requires a temperature of about 1,350 ° C. or less, preferably about 1,500 ° C. to about 1,800 ° C.
    In certain embodiments of the present invention, the combustion temperature is raised to a temperature of about 1,500 ° C. to about 1,800 ° C. by adding an oxygen amount of 10 to 20 wt% to the air, based on the air. Since the amount of air supplied or the amount of oxygen added to the air by the oxygen adding device is controlled to adjust the combustion temperature relatively easily, the amount of added oxygen can be reduced to adjust the combustion temperature to a relatively low value in the initial temperature raising step. In addition, the amount of additional oxygen is gradually increased to increase the combustion temperature. Since the process does not rapidly change the temperature of the vacuum degassing vessel 14, the rising pipe 16 and the falling pipe 18, it is possible to provide adequate heating without causing cracks or fractures in the electrocast bricks, which are passages for the molten glass G. To provide.
    A vent pipe 34 is provided at the center of the top of the vacuum degassing vessel 14 to pass through the heat insulating material 30 and the vacuum housing 12, and the exhaust pipe 42 is a lid 36 removed from the vent pipe. And communicate with the ventilation pipe 34.
    The exhaust pipe 42 is provided by the exchange of the lid 36 of the ventilation pipe 34. The air heated or the exhausted combustion gas (hereinafter referred to as the exhausted combustion gas) heated by the temperature raising burners 38 and 40 provided near the lower ends of the rising pipe 16 and the lowering pipe 18 is the rising pipe 16. ), The down pipe 18 and the inner surfaces of the vacuum degassing vessel 14 are heated, and are also discharged through the exhaust pipe.
    The exhaust pipe 42 physically controls the exhaust volume and the ventilation controller including an air nozzle 46 and an ventilation control burner 44 which raise or lower the temperature of the combusted gas in the exhaust pipe to control the flow of the combusted gas. A damper 48 is provided.
    The ventilation control burner 44 and the air nozzle 46 have a rapid flow of the combusted gas as the temperature of the combusted gas in the exhaust pipe rises and a slowed flow of the combusted gas as the temperature of the combusted gas decreases. Uses the phenomenon to control the flow of the burned gas. The damper 48 uses a butterfly valve to physically control the amount of gas burned through the exhaust pipe, that is, change the cross-sectional area of the exhaust pipe through which the burned gas passes.
    3 is a flow sheet and schematic of an example of a burner (hereinafter referred to as an oxygenated combustion burner) that can be used as temperature rising burners 38 and 40 and that can change the oxygen concentration of an oxygen containing gas used for combustion. An in diagram is shown.
    As shown in Fig. 3, the oxygenated combustion burner 50 used as the temperature rising burner according to the present invention includes a fuel supply 54 provided at its rear center and an air supply 56 provided at its rear side. Burner front plate 52, cylindrical combustion chamber 58 provided in front of burner front plate 52, and combustion chamber 58 to inject oxygen in a direction inclined to the centerline of combustion chamber 58. ) Is provided with an oxygen injection nozzle 60. Oxygenated combustion burner 50 includes fuel gas, such as city gas supplied from fuel supply 54 (with butane as a major component, 13A) and air supplied from air supply 56 behind burner front plate. Or spray the mixture from the combustion chamber 58, or the oxygenated combustion burner 50 injects fuel gas from the center of the combustion chamber and air from the outer periphery of the combustion chamber, and the oxygen injection nozzle 60 The fuel gas is combusted with oxygen injected from the vapor to combust the combustion of the fuel gas to raise the temperature of the fuel gas.
    The fuel line 62 which supplies fuel gas to the fuel supply part 54 of the combustion burner 50 to which oxygen was added is comprised of the fuel supply line 62a and the ignition line 62b. The fuel supply line includes a fuel supply source (not shown), a pressure regulator (pressure regulator 63F) for depressurizing the fuel gas, a fuel gas flow meter (pressure recognition unit, 64f) that measures the flow rate of the fuel gas, and a temperature of the fuel gas. A fuel gas thermometer 66F to measure, a fuel gas control valve 68F to control the flow rate of the fuel gas, a fuel gas pressure gauge 70F to measure the pressure of the fuel gas, and a pipe connecting these members. The ignition line branches from the fuel supply line 62a at a position between the pressure regulator 63F and the flowmeter 64F, and also the fuel gas control valve 68F ', which controls the flow rate of the ignition fuel gas, the flexible hose. 72, an ignition torch 74 provided at the tip of the flexible hose to ignite the oxygenated combustion burner 50, and a pipe connecting these members. The flowmeter 64F, the thermometer 66F, the control valve 68F and the pressure regulator 70F are electrically connected as shown by the dotted lines in this figure. The flowmeter 64F, the pressure regulator 70F, and the thermometer 66F measure the flow velocity, the pressure, and the temperature of the fuel gas, respectively. Based on the measured flow rate, pressure, and temperature, a predetermined calculation by the computer to allow the control valve 68F to control the flow rate of the fuel gas in order to allow the fuel gas to flow at the required or specific flow rate in the fuel supply line 62a. This is done.
    An air supply line 76 for supplying air to the air supply 56 of the oxygenated combustion burner 50 includes a fan 78, an air flow meter 64A for measuring the flow rate of air, and a temperature for the air. It consists of an air thermometer 66A, an air control valve 68A for controlling the flow rate of air, an air pressure gauge 70A for measuring the air pressure, and a pipe connecting these members. The flowmeter 64A, the thermometer 66A, the control valve 68A and the pressure gauge 70A are electrically connected as shown by the dotted lines in this figure. Flowmeter 64A, pressure gauge 70A and thermometer 66A measure the flow rate, pressure and temperature of air, respectively. Based on the measured flow rate, temperature and pressure, a predetermined calculation is made by the computer such that the control valve 68A controls the flow rate of the air in order to flow the air at the required flow rate or the specific flow rate in the air supply line 76. Is done.
    An oxygen supply line 80 for supplying oxygen to the oxygen injection nozzle 60 to perform combustion to add oxygen includes an oxygen source (not shown), a pressure regulator 630 for depressurizing oxygen supplied from the source, An oxygen flow meter 640 for measuring the flow rate of oxygen, an oxygen thermometer 660 for measuring the temperature of oxygen, an oxygen control valve 680 for controlling the flow rate of oxygen, an oxygen pressure gauge 700 for measuring the pressure of oxygen, And a pipe connecting these members. The flow meter 640, the thermometer 660, the control valve 680 and the pressure gauge 700 are electrically connected as shown by the dotted lines in this figure. Flowmeter 640, thermometer 660 and pressure gauge 700 measure the flow rate, temperature and pressure of oxygen. Based on the measured flow rate, temperature and pressure, a predetermined calculation is made by the computer such that the control valve 680 controls the flow rate of oxygen to flow oxygen at the required or specific flow rate in the oxygen supply line 80. .
    In the oxygenated combustion burner 50 thus configured, the fuel gas control valve 68F 'in the ignition line 62b of the fuel line 62 allows the fuel gas to flow out of the ignition torch 74. It is opened preferentially and also fuel gas is ignited on the ignition torch. The source gas whose flow is regulated through the fuel gas control valve 68F is supplied from the fuel supply line 62a to the fuel supply unit 54. Fuel gas from the fuel supply line, and air supplied to the air supply 56 are injected into the combustion chamber 58. The fuel gas thus injected is ignited by the ignited ignition torch 74 of the ignition line 62b. Thus, oxygen whose flow is regulated through the oxygen control valve 680 in the oxygen supply line 80 is injected in the direction of the center line of the combustion chamber 58 of the burner 50 ignited from the oxygen injection nozzle 60, so that the burner The combustion in which oxygen of the fuel gas in 50 was added is performed.
    The flow rate of oxygen injected from the oxygen injection nozzle 60 in the burner 50 is controlled by the oxygen control valve 680 to have a value of about 10 to 20% by volume of the flow rate of air, and the combustion temperature of the burner 50. Is adjusted to about 1,500 to 1,800 ° C.
    In the vacuum degassing apparatus according to the present invention, the temperature raising device is preferably configured as described above. The combusted gas heated by the temperature rise burners 38 and 40 with the controlled combustion temperature, if the combusted gas has its flow controlled by the ventilation controller, is the vacuum degassing vessel 14, the rising pipe 16. ) And the inner surface of the descending pipe 18.
    By providing a temperature raising device according to the invention, in particular a temperature raising device in certain examples of the invention, the inner surfaces of the vacuum degassing vessel 14, the rising pipe 16 and the lowering pipe 18 allow such specific heating. Heating in accordance with the curve prevents the molten glass G from solidifying in the vacuum degassing apparatus 10 or prevents the refractory material from being damaged due to rapid heating.
    When the temperature raising step is completed as a preliminary step for operating the vacuum degassing apparatus for the molten glass G as described above, the process of the vacuum degassing apparatus 10 is performed through the following procedure. First, the temperature rise burners 38 and 40 are stopped, and the temperature rise burners 38 and 40 are removed at the positions of the lower ends of the rise pipe 16 and the down pipe 18.
    At the same time or shortly after, the control of the exhaust gas is stopped by the ventilation controller in the exhaust pipe 42, the exhaust pipe 42 is removed from the ventilation pipe 34, and the lid 36 is ventilated to close the ventilation pipe. It is installed on the pipe 34.
    Next, the rising pipe 16 and the falling pipe 18 lower the vacuum degassing apparatus 10 or the liquid surface of the molten glass G in each upstream pit 22 and downstream pit 24. The water is submerged in the molten glass G in each of the upstream pit portions 22 and the downstream pit portions 24 by raising them.
    Next, a vacuum pump (not shown) is operated to perform discharge to depressurize the vacuum housing 12 (vacuum degassing vessel 14).
    At the same time, it is required that the upstream pit 22 and the downstream pit 24 be filled with molten glass G having such a specific temperature. For this purpose, the upstream pit part 22 and the downstream pit part 24 are temporarily joined together so that the molten glass G flows simultaneously from the melting vessel 20 to the pit parts 22 and 24 on both sides. It is preferable.
    When the interior of the vacuum housing 12 and the interior of the vacuum degassing vessel 14 are discharged by the vacuum pump and decompressed to a specific value, the molten glass G has a vacuum algassing vessel 14 so as to have a certain altitude therein. ) And also bubbles in the molten glass G rise onto the liquid surface of the molten glass. The vacuum degassing process starts by breaking the bubbles, and the process of the vacuum degassing apparatus 10 is replaced with a stable process. The molten glass G thus vacuum degassed is continuously supplied to the downstream pit portion 24.
    All areas in direct contact with the molten glass G, namely the rise pipe 16, the vacuum degassing vessel and the down pipe 18, are electroformed in the vacuum degassing apparatus 10 shown in FIGS. 1 and 2, though. Although all are made of bricks, the present invention is not limited in such a case. Any part in direct contact with the molten glass G may be made of a noble metal as in the vacuum degassing apparatus 82 shown in FIG. 4.
    The vacuum degassing apparatus 82 shown in FIG. 4 has the same reason as the vacuum degassing apparatus 10 shown in FIGS. 1 and 2 for the following reasons, that is, the extension pipes 26 and 28 are raised pipes 16. And the lower pipe 18, and the extended pipes 26 and 28 are submerged in the molten glass G at a high temperature with respect to the rising pipe 16 and the falling pipe 18 so that the extended pipe ( 26 and 28) are made of precious metal alloys such as platinum.
    Although the vacuum degassing apparatus for molten glass according to the present invention has been described in detail, the present invention is not limited to the above-described embodiment. Modifications and other arrangements may be made within the scope of the present invention other than those described herein.
    Vacuum degassing for molten glass, which ensures sufficient durability for the molten glass at high temperatures, significantly reduces costs, enables mass production and removes bubbles from the continuously supplied molten glass that increases the vacuum degassing temperature In the apparatus, the temperature raising device according to the present invention heats the inner surface of the vacuum degassing vessel, the rising pipe and the falling pipe with a specific temperature curve, so that the molten glass G solidifies in the vacuum degassing apparatus. And prevent the refractory material from being damaged by rapid heating.
    权利要求:
    Claims (6)
    [1" claim-type="Currently amended] A vacuum housing exhausted to depressurize the inside;
    A vacuum degassing vessel provided in the vacuum housing to vacuum degassing the molten glass;
    A rising pipe communicating with the vacuum degassing vessel to suck the molten glass prior to degassing to introduce the molten glass into the vacuum degassing vessel;
    A descending pipe communicating with the vacuum degassing vessel and sucking the degassed molten glass from the vacuum degassing vessel; And
    A vacuum degassing apparatus for molten glass comprising the vacuum degassing vessel having the passage for molten glass made of a refractory material, the rising pipe and the falling pipe,
    A temperature raising device including a temperature raising burner provided at the lower end of the rising pipe and the lowering pipe is provided before operating the vacuum degassing apparatus, and the exhaust pipe is in communication with the upper end of the vacuum degassing vessel; Also
    Before operating the vacuum degasser, a temperature rise burner is used to burn the fuel, and the gas burned from the temperature rise burner is exhausted through the exhaust pipe to raise the temperature of the vacuum degassing vessel, the rise pipe and the down pipe. Vacuum degassing apparatus, characterized in that.
    [2" claim-type="Currently amended] The vacuum degassing apparatus according to claim 1, wherein an oxygen concentration of an oxygen-containing gas used for burning the temperature rising burner can be changed.
    [3" claim-type="Currently amended] 2. The vacuum degassing apparatus according to claim 1, wherein the exhaust pipe includes a ventilation controller comprising a ventilation control burner for controlling the flow of the exhausted exhaust gas, and a damper for controlling the exhaust amount of the exhausted combustion gas.
    [4" claim-type="Currently amended] A vacuum housing vented to depressurize;
    A vacuum degassing vessel provided in the vacuum housing for vacuum degassing the molten glass;
    A rising pipe in communication with the vacuum degassing vessel to suck the molten glass before degassing and introduce it into the vacuum degassing vessel;
    A falling pipe for sucking the molten glass degassed in association with the vacuum degassing vessel from the vacuum degassing vessel; And
    Vacuum degassing vessel in the molten glass vacuum degassing vessel, the rising pipe and the descending pipe before operating the vacuum degassing vessel having the passage for the molten glass made of refractory material, the rising pipe and the falling pipe. In the method of raising the temperature of,
    Providing a temperature rise burner provided at the bottom of the rise pipe and the down pipe to burn fuel; And
    Exhausting the combusted gas through an exhaust pipe in communication with the upper end of the vacuum degassing vessel.
    [5" claim-type="Currently amended] 5. The method of claim 4, further comprising varying the oxygen concentration of the gas containing oxygen used for combustion.
    [6" claim-type="Currently amended] 5. The method of claim 4, further comprising controlling the flow of combustion gas exhausted from the exhaust pipe and the amount of exhaust gas exhausted.
    类似技术:
    公开号 | 公开日 | 专利标题
    EP0171638B1|1989-05-31|Melting of glass with staged submerged combustion
    US5411240A|1995-05-02|Furnace for delivering a melt to a casting machine
    KR900005198B1|1990-07-21|Foam control method for vacuum refining of glassy materials
    EP0908417B1|2002-09-11|Vacuum degassing apparatus for molten glass
    KR101327141B1|2013-11-20|Method of eliminating blisters in a glass making process
    CA1171283A|1984-07-24|Glass batch liquefaction
    US4986748A|1991-01-22|Wide range oxy-fuel burner and furnace operation
    KR100901098B1|2009-06-08|Conduit for molten glass, molten glass degassing method, and molten glass degassing apparatus
    KR101075290B1|2011-10-19|System and method for controlling the environment around one or more vessels in a glass manufacturing system
    US20060179886A1|2006-08-17|Low heat capacity gas oxy fired burner
    US6357264B1|2002-03-19|Apparatus for melting molten material
    JP2014231473A|2014-12-11|Device and method for manufacturing glass
    JP2013508255A|2013-03-07|Molten glass delivery and purification system
    KR100439547B1|2004-07-12|Melting/retaining furnace for aluminum ingot
    US20050005646A1|2005-01-13|Device and method for melting a substance with the occurrence of a low level of contamination
    TWI408110B|2013-09-11|Float bath system for manufacturing float glass and cooling method of the same
    EP1524243A1|2005-04-20|Apparatus and method for making high-melting glasses and glass ceramics as well as the glasses or glass ceramics
    TWI469937B|2015-01-21|Float bath for manufacturing float glass and cooling method of the same
    US6470710B1|2002-10-29|Method for melting glass
    CA2381238C|2007-10-23|Skull pot for melting or refining inorganic substances
    CA2595611C|2013-05-14|Immersed burner with regulated flame
    DE3906270C2|1994-12-08|Method and device for melting glass
    JP2817168B2|1998-10-27|Glass fining equipment
    US6318126B1|2001-11-20|Vacuum degassing method for molten glass
    WO2002100576A1|2002-12-19|Molten metal treatment furnace with level control
    同族专利:
    公开号 | 公开日
    JPH11240727A|1999-09-07|
    DE69903365T3|2008-12-04|
    KR100583221B1|2006-05-24|
    DE69903365T2|2003-06-26|
    CZ47899A3|1999-11-17|
    JP3785788B2|2006-06-14|
    EP0939058B2|2008-08-06|
    CZ299360B6|2008-07-02|
    US6202445B1|2001-03-20|
    EP0939058A1|1999-09-01|
    DE29924987U1|2007-10-04|
    DE69903365D1|2002-11-14|
    EP0939058B1|2002-10-09|
    ID21937A|1999-08-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-02-27|Priority to JP04779498A
    1998-02-27|Priority to JP98-47794
    1999-02-26|Application filed by 세야 히로미치, 아사히 가라스 가부시키가이샤
    1999-09-27|Publication of KR19990072982A
    2003-07-09|First worldwide family litigation filed
    2006-05-24|Application granted
    2006-05-24|Publication of KR100583221B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP04779498A|JP3785788B2|1998-02-27|1998-02-27|Vacuum degassing equipment for molten glass|
    JP98-47794|1998-02-27|
    [返回顶部]