WO2007009933A1 - Flachglasofen - Google Patents
Flachglasofen Download PDFInfo
- Publication number
- WO2007009933A1 WO2007009933A1 PCT/EP2006/064186 EP2006064186W WO2007009933A1 WO 2007009933 A1 WO2007009933 A1 WO 2007009933A1 EP 2006064186 W EP2006064186 W EP 2006064186W WO 2007009933 A1 WO2007009933 A1 WO 2007009933A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- glass
- air
- stove
- flat glass
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
- C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products
- C03B29/08—Glass sheets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
Definitions
- the present invention relates to a flat glass furnace, which is particularly suitable for tempering glass sheets, which furnace can be interconnected with known per se sections for shock cooling and aftercooling of the heated glass sheets in the oven.
- a flat glass furnace has a furnace base and a furnace top.
- furnace rollers are arranged for transporting is to be heated glass ⁇ .
- a plurality of heating elements are present, which should bewir ⁇ ken as uniform as possible heating of the glass.
- EP 1 241 143 A2 describes a tempering furnace which is equipped with heating elements as well as with elements for heat convection in the furnace top both at the bottom and in the upper furnace area.
- the glass sheets are transported by rollers through the oven.
- the longitudinally arranged heat convection elements cause different heat convection zones, which can be changed relative to one another.
- To heat the glass there is a direct blowing of the glass sheet with convection air from above.
- the flows formed thereby cause, in particular in the case of large glass panes, uneven heating, which can lead to considerable undesired material stresses.
- roller furnace for heating glass sheets to their softening temperature.
- the roller furnace described has an arrangement of gas jet pumps, which are arranged above the roller conveyor transversely to the direction of movement of the glass panes, for blowing hot gas onto the top of the glass panes, so as to provide a To allow heating of these tops by convection.
- gas jet pumps which are arranged above the roller conveyor transversely to the direction of movement of the glass panes, for blowing hot gas onto the top of the glass panes, so as to provide a To allow heating of these tops by convection.
- For heating the lower glass pane surface heating resistors are used, which are arranged below the roller conveyor ⁇ .
- the ovens known from the prior art have in common that the objective of uniformly heating the glass panes introduced into the oven is pursued by the arrangement of several heating groups and partly by the combination of different heat transfer principles. This is necessary in order to achieve good results in the targeted formation of material stresses, which is necessary in particular in the production of single-pane safety glass.
- Radiant heating elements in particular electrical heating resistors and heat radiators, are often coupled with convective heating elements, for example hot gas ducts.
- the aim is also to shorten the heating times, wherein the temperature gradient within the glass pane must not be too high, otherwise the glass breakage threatens.
- the object of the present invention is therefore to provide an improved flat glass furnace, with which short heating and uniform as possible Temperaturver ⁇ distributions can be ensured throughout the oven.
- a flat glass furnace in which, in addition to lower heating groups below the furnace rolls and upper heating groups above the furnace rolls, each consisting of electrical heating resistors, a plurality of circulating units are provided in the upper furnace part, which intentionally cause convective heating of the glass pane. ken by blowing the heated furnace air from numerous air nozzles on the glass top. The furnace air is moved in the recirculation method and swirled in the recirculation units targeted to achieve a very uniform heating. Due to the circulation of air within the furnace is constructivege ⁇ provides that all areas of the furnace are almost at the same temperature level, which can not be ensured solely by the Anord ⁇ tion of the electrical heating resistors. By arranging several convection units ben substantially over the whole for the glass ticket ⁇ extend the available bearing surface, low flow velocities with which nevertheless a high degree of uniformity is achieved in the lung Temperaturvertei ⁇ be selected.
- the flat glass furnace described here is particularly suitable for tempering glass sheets with a maximum dimension of 2.00 mx 3.40 m and glass thicknesses between 3 and 12 mm.
- the usual heating temperatures in this oven are about 620 to 680 0 C.
- the flat glass furnace is part of a Glastemperrange, which further comprises systems for shock cooling and aftercooling of the heated glass sheets.
- the cooling takes place outside of the flat glass furnace and there are provided Trans ⁇ port routes between the individual sections of Glastemperrange.
- the flat glass furnace for a nominal temperature of 750 0 C and a heating power of about 600 kW is designed.
- a task roller conveyor is present, on which the glass pane to be heated is placed and aligned for subsequent transport on the oven rolls.
- so-called roller tracks can be extended between the individual roles if necessary under the lift table on which the glass pane can be moved transversely to the main transport direction.
- the air nozzles of each circulation box of the circulating units are arranged in a plurality of rows which extend substantially perpendicular to the running direction of the glass pane.
- Such rows of nozzles can be easily supplied with a constant air pressure, so that the air outlet at the nozzles is almost independent of their position within the furnace.
- other nozzle arrangements can be selected if the air ducts within the circulation box ensure that the distribution of the air outlet is as uniform as possible.
- the aspirated furnace air is directed within the circulation box on one or more baffles to cause a strong turbulence of the sucked furnace air within the recirculation unit.
- This serves to further standardize the temperature level of the circulating air, which is directed to the glass pane for further heating. It has been shown that even small differences in temperature at different outlet nozzles lead to stresses within the glass sheet, which can result in glass breakage.
- the fan wheels are coupled in the recirculation units to variable speed motors, which are located outside the furnace chamber. About the speed ⁇ control the flow conditions can be affected within the furnace, so that for example in the initial phase of heating ⁇ a high flow rate can be adjusted, while at higher temperatures lower flow velocities are selected.
- the electrical heating resistors of the upper and lower heating groups are wound on ceramic threaded tubes, which are stabili ⁇ preferably by support tubes.
- the upper heating groups can preferably be adjusted to change the distance to the glass. It is also possible to integrate the Umisselzüen in the respective height setting.
- FIG. 3 shows three views of a circulating air box arranged in the furnace upper part air circulation unit.
- Figures 1 and 2 show a simplified representation of a longitudinal sectional view or cross-sectional view of a fiction, modern flat glass furnace.
- the flat glass furnace has a furnace base 1 and a furnace shell 2 with a central portion 3 and a lid 4.
- Middle section and cover of Ofenober ⁇ part can be separated from each other for maintenance purposes.
- lifting doors 5 are provided at the entry and exit openings, which can be moved via corresponding lifting devices.
- each oven roll 6 can be individually adjusted in height.
- lower heating groups 8 are vorgese ⁇ hen, which are preferably formed by electrical heating resistors. It is expedient to configure the lower heating groups separately controllable to by appropriate
- the electrical heating resistors are expediently wound on ceramic threaded tubes ⁇ , which in turn are pushed onto a support tube.
- the support tube lies with its ends in each case on the lateral furnace insulation and is additionally supported at larger furnace dimensions at one or more support points in the longitudinal direction.
- the lower heating groups 8 are each covered by a protective cover 9, which consists of a heat-resistant, perforated material.
- glass break pans For collecting any glass breakage occurring below the lower heating groups 8 glass break pans are arranged, which can be taken out of the oven laterally to remove the accumulated glass breakage.
- temperature sensors are arranged at several points in the oven, with which the local temperature and above the temperature distribution throughout the oven can be determined as precisely as possible.
- the measured values obtained are used to control the individual heating groups, always with the aim of a uniform oven interior temperature.
- two upper heating groups 10 are arranged as components of the upper part of the furnace 2. These are preferably in turn to electric heating resistors, which are built up in a comparable manner to the lower heating zones and also in groups or individually even ⁇ can be controlled. In a dimension of the furnace chamber for receiving glass panes of about 2 mx 3.40 m, a subdivision of the heating groups in 24 upper groups and 24 lower groups has proved to be useful.
- each recirculation unit has a circulation box 12, the structure of which is explained in more detail with reference to FIG.
- Each recirculation unit 11 is further associated with a variable speed motor 13 which drives a fan 14.
- 6 recirculating air units 11 are provided in the longitudinal direction so as to obtain a uniform flow throughout the furnace interior to provide minimum temperature gradients.
- each Umisselzkasten 12 may be attached via a suspension 15 on the cover 4.
- a positional adjustment of the Umisselzhims- th possible, for example, to adapt to the impellers and motors used.
- Fig. 3 shows in three simplified views a preferred embodiment of the circulation box 12, wherein the direction of flow during the circulation operation is illustrated by arrows.
- front view of the Umisselzkastens is seen that maximum of which is from the furnace interior being ⁇ sucked heated air initially blown up within the Ummélzkas ⁇ by the fan 14, where it comes through contact with a baffle plate 16 to a swirling , The accelerated air streams then flow through the shape of the circulation box 12 passed back down.
- the circulating box preferably has the shape a truncated cone with a rectangular base, on which a plurality of rows of nozzles 17 equipped with air nozzles 18 are arranged, as can be seen from the plan view shown in Figure b).
- the air currents caused by the circulation units can be easily recognized from the side view according to FIG. 3 c).
- the air located in the furnace chamber is sucked into the circulation box via intake openings 19 arranged in the upper region of the circulation box 12.
- the turbulence and flow pressure increase by means of the fan wheel 14.
- the turbulence of the turbulent air takes place at the bottom of the circulation box via the air nozzles 17.
- the outflowing air is directed to the glass sheet, which rests on the furnace rollers 6.
- the air exiting the air nozzles 17 before contacting the glass sheet flows through the upper heating groups 10, which extend between the furnace rollers 6 and the air circulating units 11 (see Fig. 2). At this point, a further warming of the flow air takes place. In addition, a heat accumulation in the vicinity of the upper heating group 10 is avoided, whereby the warm-up can be further shortened.
- air baffles can be angeord ⁇ net, which vary the flow cross-section of individual air ducts, taking into account the channel length. It is an objective to distribute the exit velocity and the amount of air at the air nozzles 17 as evenly as possible. In modified embodiments, it is conceivable to arrange further recirculation units in the furnace lower part in order to apply a targeted air flow to the glass pane to be heated, also on the underside. In this way, the uniformity of the temperature distribution in the glass pane can be further increased and the convection of the desired heat transfer increases.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008520881A JP2009501122A (ja) | 2005-07-15 | 2006-07-13 | 板ガラス炉 |
US11/988,886 US20090100875A1 (en) | 2005-07-15 | 2006-07-13 | Sheet glass oven |
EP06777747A EP1907329A1 (de) | 2005-07-15 | 2006-07-13 | Flachglasofen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005033776A DE102005033776B4 (de) | 2005-07-15 | 2005-07-15 | Flachglasofen |
DE102005033776.7 | 2005-07-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007009933A1 true WO2007009933A1 (de) | 2007-01-25 |
Family
ID=36954261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/064186 WO2007009933A1 (de) | 2005-07-15 | 2006-07-13 | Flachglasofen |
Country Status (8)
Country | Link |
---|---|
US (1) | US20090100875A1 (de) |
EP (1) | EP1907329A1 (de) |
JP (1) | JP2009501122A (de) |
KR (1) | KR20080033412A (de) |
CN (1) | CN101223113A (de) |
DE (1) | DE102005033776B4 (de) |
RU (1) | RU2008105250A (de) |
WO (1) | WO2007009933A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102557415A (zh) * | 2010-09-22 | 2012-07-11 | 格拉斯顿服务有限公司 | 喷嘴箱组件 |
WO2014111622A1 (en) * | 2013-01-18 | 2014-07-24 | Feracitas Oy | A method for improving an air circulation and a way for heating air in a glass tempering oven |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009037299A1 (de) * | 2009-08-14 | 2011-08-04 | Leybold Optics GmbH, 63755 | Vorrichtung und Behandlungskammer zur thermischen Behandlung von Substraten |
US20110041558A1 (en) * | 2009-08-19 | 2011-02-24 | Han Gon Kim | Heat treatment apparatus for tempering glass |
IT1397933B1 (it) * | 2009-12-23 | 2013-02-04 | System Spa | Forno per lastre in materiale ceramico. |
JP5565127B2 (ja) * | 2010-06-17 | 2014-08-06 | 旭硝子株式会社 | ガラス板の製造装置および製造方法 |
CN102181612A (zh) * | 2011-01-20 | 2011-09-14 | 马鞍山钢铁股份有限公司 | 一种回火炉燃烧装置 |
CN102690048B (zh) * | 2011-03-25 | 2015-03-11 | 洛阳北方玻璃技术股份有限公司 | 玻璃钢化用加热炉的加热方法 |
CN102690047A (zh) * | 2011-03-25 | 2012-09-26 | 洛阳北方玻璃技术股份有限公司 | 玻璃钢化用加热炉 |
ITRE20110055A1 (it) * | 2011-07-25 | 2013-01-26 | Keraglass Engineering S R L | Forno per la ricottura di lastre di vetro |
KR101351332B1 (ko) * | 2012-03-23 | 2014-01-16 | 주식회사 엘티에스 | 레이저를 이용한 유리기판 절단장치 |
CN102757171B (zh) * | 2012-07-12 | 2014-07-09 | 湖北新华光信息材料有限公司 | 退火炉 |
FI20135728L (fi) | 2013-07-03 | 2015-01-04 | Taifin Glass Machinery Oy | Menetelmä lasilevyn lämmittämiseksi ja lasinkarkaisu-uuni |
FR3048692B1 (fr) * | 2016-03-08 | 2018-04-20 | Fives Stein | Installation de production de verre plat comprenant une installation de mesure en continu de la temperature du verre et procede de reglage d'une telle installation de mesure |
CN106565078A (zh) * | 2016-11-04 | 2017-04-19 | 重庆兆峰玻璃晶品有限公司 | 一种退火冷却装置 |
CN107857467B (zh) * | 2017-11-30 | 2020-04-21 | 河北省沙河玻璃技术研究院 | 一种建筑浮法微晶玻璃晶化退火窑及玻璃晶化方法 |
DE102018204476A1 (de) * | 2018-03-23 | 2019-09-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung mit einem Ofen und Verfahren zu deren Verwendung |
CN110526560A (zh) * | 2018-09-21 | 2019-12-03 | 安徽恒春玻璃股份有限公司 | 一种钢化炉对流系统设备 |
CN109553285B (zh) * | 2018-12-29 | 2021-10-01 | 蚌埠凯盛工程技术有限公司 | 一种可调节高度的退火窑保温区末端挡板及其安装方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB331927A (en) * | 1929-04-13 | 1930-07-14 | Simplex Engineering Company | Improvements in glass-annealing leers |
US5814789A (en) * | 1996-07-18 | 1998-09-29 | Btu International, Inc. | Forced convection furnance gas plenum |
US20040093904A1 (en) * | 2002-11-12 | 2004-05-20 | John Haws | Furnace apparatus and method for tempering low emissivity glass |
JP2005097033A (ja) * | 2003-09-24 | 2005-04-14 | Asahi Glass Co Ltd | 板状体の加熱方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4529380A (en) * | 1981-12-22 | 1985-07-16 | Glasstech, Inc. | Glass sheet roller conveyor furnace including gas jet pump heating |
FI20010528A0 (fi) * | 2001-03-16 | 2001-03-16 | Tamglass Ltd Oy | Menetelmä ja laite lasilevyjen lämmittämiseksi teloilla varustetussa karkaisu-uunissa |
ATE468305T1 (de) * | 2003-03-31 | 2010-06-15 | Glassrobots Oy | Umluftheizofen für eine vorgespannte glasscheibe |
-
2005
- 2005-07-15 DE DE102005033776A patent/DE102005033776B4/de not_active Expired - Fee Related
-
2006
- 2006-07-13 JP JP2008520881A patent/JP2009501122A/ja active Pending
- 2006-07-13 US US11/988,886 patent/US20090100875A1/en not_active Abandoned
- 2006-07-13 KR KR1020087003730A patent/KR20080033412A/ko not_active Application Discontinuation
- 2006-07-13 RU RU2008105250/03A patent/RU2008105250A/ru unknown
- 2006-07-13 CN CNA2006800258534A patent/CN101223113A/zh active Pending
- 2006-07-13 EP EP06777747A patent/EP1907329A1/de not_active Withdrawn
- 2006-07-13 WO PCT/EP2006/064186 patent/WO2007009933A1/de active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB331927A (en) * | 1929-04-13 | 1930-07-14 | Simplex Engineering Company | Improvements in glass-annealing leers |
US5814789A (en) * | 1996-07-18 | 1998-09-29 | Btu International, Inc. | Forced convection furnance gas plenum |
US20040093904A1 (en) * | 2002-11-12 | 2004-05-20 | John Haws | Furnace apparatus and method for tempering low emissivity glass |
JP2005097033A (ja) * | 2003-09-24 | 2005-04-14 | Asahi Glass Co Ltd | 板状体の加熱方法 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102557415A (zh) * | 2010-09-22 | 2012-07-11 | 格拉斯顿服务有限公司 | 喷嘴箱组件 |
WO2014111622A1 (en) * | 2013-01-18 | 2014-07-24 | Feracitas Oy | A method for improving an air circulation and a way for heating air in a glass tempering oven |
Also Published As
Publication number | Publication date |
---|---|
US20090100875A1 (en) | 2009-04-23 |
EP1907329A1 (de) | 2008-04-09 |
CN101223113A (zh) | 2008-07-16 |
DE102005033776A1 (de) | 2007-01-18 |
DE102005033776B4 (de) | 2007-06-21 |
RU2008105250A (ru) | 2009-08-20 |
JP2009501122A (ja) | 2009-01-15 |
KR20080033412A (ko) | 2008-04-16 |
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