EP0468867B1 - Drying equipment having a system to prevent fire - Google Patents
Drying equipment having a system to prevent fire Download PDFInfo
- Publication number
- EP0468867B1 EP0468867B1 EP91402024A EP91402024A EP0468867B1 EP 0468867 B1 EP0468867 B1 EP 0468867B1 EP 91402024 A EP91402024 A EP 91402024A EP 91402024 A EP91402024 A EP 91402024A EP 0468867 B1 EP0468867 B1 EP 0468867B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- vapour
- steam
- spray
- hood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/009—Alarm systems; Safety systems, e.g. preventing fire and explosions
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/001—Drying webs by radiant heating
- D21F5/002—Drying webs by radiant heating from infrared-emitting elements
Definitions
- the present invention relates to drying equipment according to the preamble of Claim 1
- the thermal inertia of these systems must lead to taking measures to avoid the risk of fire.
- Fires can be caused by two sets of causes.
- radiant burners are equipped with cells that detect the change in energy caused by the appearance of a flame and trigger a water spray system.
- the response time of such a system is approximately 0.2 seconds.
- the present invention relates to a drying equipment comprising a battery of radiant burners for drying a sheet material moving past a radiant surface formed by the radiant burners, a suction hood, a blowing hood and a spraying system. for emitting a vapor flow to prevent a fire, characterized in that the extractor hood and the supply hood are arranged on either side of the battery of radiant burners in the direction of travel of the sheet material to delimit a volume between the radiant surface, the surface of the sheet material to be dried and the hoods, and that the spraying system is consisting of a spray boom arranged to emit, during a cycle of spraying, the flow of vapor directly into said volume in response to a detection of the sheet material passing through to prevent a fire.
- the vapor is not polluting and does not risk damaging the paper or other material that runs and has to be dried.
- the integration of the steam ramps in the infrared system makes it possible to concentrate a jet of steam where it is needed, namely between the radiant plates and the surface to be treated.
- the required flow rates are lower than the flow rates relating to the devices of the prior art with regard to water.
- the sprayer boom is arranged in the lower part of the hood of the suction hood where the temperature is above 130 ° C.
- the sprayer boom is systematically vaporized.
- FIG. 1 therefore represents, in front view, a radiant burner of the type closed by an upper cover 1 and equipped with two side hoods, namely a suction hood 2 and a blowing hood 3.
- the supply of combustion air and fresh air is via the central duct 4 which has lower orifices intended for evacuation fresh air and the air / gas mixture takes place in the mixers 5 supplying the active parts 6 of the radiant burner.
- the characteristic of this device is to include a vapor spraying ramp 7 integrated in the cover of the radiant burner and arranged in the case shown in a lower part of the suction hood 2.
- the vapor sprayed by the ramp 7 is shown diagrammatically at 8 in FIG. 1.
- the ramps 16 are automatically activated.
- this stoppage can be caused by a breakage of the paper and first of all the ramp sends a flow of vapor which is mixed, a few seconds later, a certain amount of water.
- an automatic control system sends into a set of spray bars 7, a vapor flow to which water is added; preferably, the steam corresponds for 1 kg to 1.6 m3 of steam at atmospheric pressure.
- the cycle is fully automated by automated management. Steam, unlike water, does not pollute the surface of the paper. As can be seen in Figure 3, the automatic cycle is 15 seconds, but there is also a manual push button that keeps the system running if necessary.
- FIG. 2 schematically represents the device for supplying steam and water to the spray bars 7.
- the steam control circuit and its mixture with water is shown in Figure 2. Air is sent to a pressure of about 6 bars in the steam which is at a minimum pressure of 3 bars. This pressurized steam passes through a desuperheating pipe 10 where the water circuit also terminates under a pressure of approximately 5 bars. The steam / water mixture can then be sent to the spray bars 7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Paper (AREA)
- Cell Separators (AREA)
- Primary Cells (AREA)
Abstract
Description
La présente invention concerne un équipement de séchage selon le préambule de la Revendication 1
L'inertie thermique de ces systèmes doit conduire à prendre des mesures pour éviter les risques d'incendie.The present invention relates to drying equipment according to the preamble of
The thermal inertia of these systems must lead to taking measures to avoid the risk of fire.
Les incendies peuvent être provoqués par deux séries de cause.Fires can be caused by two sets of causes.
Tout d'abord, lorsque le papier ou le matériel sèche entre en contact avec le système infrarouge, il y a apparition de flammes. Ce cas peut se produire à tous moments et principalement lorsqu'il y a casse du papier et lorsque des morceaux de papier se détachent de la surface de défilement.First of all, when the paper or dry material comes into contact with the infrared system, flames appear. This can happen at any time, mainly when there is broken paper and when pieces of paper come off the running surface.
Par ailleurs, il y a également risque d'incendie lorsqu'il y a arrêt de la feuille sous les infrarouges.In addition, there is also a risk of fire when the sheet stops under the infrared.
Dans ce cas, il y a donc prise de feu du papier puisque la température est importante et que l'on se trouve en présence d'oxygène.In this case, there is therefore a fire in the paper since the temperature is high and we are in the presence of oxygen.
Actuellement, les brûleurs radiants sont équipés de cellules qui détectent la variation d'énergie provoquée par l'apparition d'une flamme et déclenchent un système de pulvérisation d'eau. Le temps de réponse d'un tel système est d'environ 0,2 seconde.Currently, radiant burners are equipped with cells that detect the change in energy caused by the appearance of a flame and trigger a water spray system. The response time of such a system is approximately 0.2 seconds.
Or, un tel temps de réponse correspond à des distances très longues sur les machines rapides où la vitesse de défilement est supérieure à 600 mètres par minute. Il en résulte un perte d'efficacité importante.However, such a response time corresponds to very long distances on fast machines where the running speed is greater than 600 meters per minute. This results in a significant loss of efficiency.
Par ailleurs, la pulvérisation d'eau entraîne la pollution du papier puisque des gouttes d'eau tombent sur le papier après mise en place.In addition, the spraying of water causes pollution of the paper since drops of water fall on the paper after placement.
Selon l'art antérieur, il existe des systèmes de prévention, tel que décrit dans le document FR-2 532 733, mais ces systèmes sont toujours extérieurs à la batterie des brûleurs radiants. Il s'agit en général de rampes installées sur le côté extérieur d'une des hottes à une dizaine de centimètres de la paroi externe de celle-ci.According to the prior art, there are prevention systems, as described in document FR-2,532,733, but these systems are always external to the battery of radiant burners. These are generally ramps installed on the outside of one of the hoods about ten centimeters from the outer wall thereof.
Ce type de système doit être monté et démonté indépendamment de la batterie de brûleurs radiants. Mais surtout et c'est là son inconvénient majeur, compte tenu de la dimension relativement réduite entre la hotte et le matériau à sécher, il se produit un mauvais passage de la vapeur et de l'eau de la hotte et de façon systématique une partie de la vapeur vient sous pression buter sur la hotte où elle se condense et il en résulte une chute de gouttes d'eau sur le papier ou la matière à sécher.This type of system must be assembled and disassembled independently of the battery of radiant burners. But above all and this is its major drawback, given the relatively small dimension between the hood and the material to be dried, there is a poor passage of steam and water from the hood and systematically a part steam comes under pressure to abut on the hood where it condenses and this results in a drop of water drops on the paper or the material to be dried.
Ce principe de prévention d'incendie pose donc de gros problèmes d'efficacité que le système selon l'invention se propose de résoudre.This principle of fire prevention therefore poses major efficiency problems which the system according to the invention proposes to solve.
Pour ce faire, la présente invention concerne un équipement de séchage comprenant une batterie de brûleurs radiants pour sécher un matériau en feuille défilant devant une surface radiante formée par les brûleurs radiants, une hotte d'aspiration, une hotte de soufflage et un système de pulvérisation pour émettre un flux de vapeur pour prévenir un incendie, caractérisé en ce que la hotte d'aspiration et la hotte de soufflage sont disposées de part et d'autre de la batterie de brûleurs radiants selon la direction de défilement du matériau en feuille pour délimiter un volume entre la surface radiante, la surface du matériau en feuille à sécher et les hottes, et que le système de pulvérisation est constitué d'une rampe de pulvérisation agencée pour émettre, pendant un cycle de pulvérisation, le flux de vapeur directement dans ledit volume en réponse à une détection d'arrêt de défilement du matériau en feuille pour prévenir un incendie.To do this, the present invention relates to a drying equipment comprising a battery of radiant burners for drying a sheet material moving past a radiant surface formed by the radiant burners, a suction hood, a blowing hood and a spraying system. for emitting a vapor flow to prevent a fire, characterized in that the extractor hood and the supply hood are arranged on either side of the battery of radiant burners in the direction of travel of the sheet material to delimit a volume between the radiant surface, the surface of the sheet material to be dried and the hoods, and that the spraying system is consisting of a spray boom arranged to emit, during a cycle of spraying, the flow of vapor directly into said volume in response to a detection of the sheet material passing through to prevent a fire.
Les principaux avantages d'un tel dispositif sont les suivants.The main advantages of such a device are as follows.
Contrairement à l'eau, la vapeur n'est pas polluante et ne risque pas de détériorer le papier ou autre matériau défilant et à sécher.Unlike water, the vapor is not polluting and does not risk damaging the paper or other material that runs and has to be dried.
En effet, les rampes étant intégrées, aucune goutte ne retombe sur le papier.Indeed, the ramps being integrated, no drop falls on the paper.
De plus, l'intégration des rampes de vapeur dans le système infrarouge permet de concentrer un jet de vapeur là où il faut, à savoir entre les plaques radiantes et la surface à traiter.In addition, the integration of the steam ramps in the infrared system makes it possible to concentrate a jet of steam where it is needed, namely between the radiant plates and the surface to be treated.
Les débits nécessaires sont inférieurs aux débits concernant les dispositifs de l'art antérieur pour ce qui est de l'eau.The required flow rates are lower than the flow rates relating to the devices of the prior art with regard to water.
De plus, le fait de pulvériser de l'eau dans la vapeur abaisse la température de celle-ci ce qui améliore l'efficacité et la sécurité du personnel.In addition, the fact of spraying water into the vapor lowers the temperature thereof which improves the efficiency and the safety of the personnel.
Selon un agencement préféré, la rampe de pulvérisation est disposée dans la partie basse du capotage de la hotte d'aspiration où la température est supérieure à 130°C. Ainsi en cas de présence d'eau dans la vapeur celle-ci est systématiquement vaporisée.According to a preferred arrangement, the sprayer boom is arranged in the lower part of the hood of the suction hood where the temperature is above 130 ° C. Thus, in the presence of water in the vapor, it is systematically vaporized.
L'invention est exposée ci-après plus en détail à l'aide de dessins représentant seulement un mode d'exécution.
- La figure 1 est une vue frontale d'un brûleur radiant de type fermé et équipé conformément à l'invention.
- La figure 2 est un schéma relatif à la régulation de la vapeur;
- La figure 3 est un graphe représentant le cycle d'une pulvérisation du mélange vapeur/eau.
- Figure 1 is a front view of a radiant burner of the closed type and equipped in accordance with the invention.
- FIG. 2 is a diagram relating to the regulation of steam;
- Figure 3 is a graph showing the cycle of a spraying of the steam / water mixture.
La figure 1 représente donc, en vue frontale, un brûleur radiant du type fermé par un capot supérieur 1 et équipé de deux hottes latérales, à savoir une hotte d'aspiration 2 et une hotte de soufflage 3. L'alimentation en air comburant et en air neuf se fait par le conduit central 4 qui comporte des orifices inférieurs destinés à l'évacuation de l'air neuf et le mélange air/gaz se fait dans les mélangeurs 5 alimentant les parties actives 6 du brûleur radiant.FIG. 1 therefore represents, in front view, a radiant burner of the type closed by an
La caractéristique de ce dispositif est de comporter une rampe de pulvérisation de vapeur 7 intégrée dans le capotage du brûleur radiant et disposée dans le cas représenté dans une partie inférieure de la hotte d'aspiration 2.The characteristic of this device is to include a
La vapeur pulvérisée par la rampe 7 est schématisée en 8 sur la figure 1.The vapor sprayed by the
En cas d'arrêt du défilement de la surface à sécher, automatiquement les rampes 16 sont mises en action.If the scrolling of the surface to be dried stops, the ramps 16 are automatically activated.
Comme on peut le comprendre sur la figure 3, cet arrêt peut être provoqué par une casse du papier et tout d'abord la rampe envoie un flux de vapeur auquel est mélangée, quelques secondes plus tard, une certaine quantité d'eau.As can be understood in Figure 3, this stoppage can be caused by a breakage of the paper and first of all the ramp sends a flow of vapor which is mixed, a few seconds later, a certain amount of water.
Comme on peut le voir sur ce graphe de la figure 3, la vapeur est envoyée dans la rampe dès la casse du papier ou du matériau à sécher. Quelques secondes plus tard, de l'eau est injectée dans la vapeur pour des raisons de sécurité et d'efficacité. En effet, la vapeur étant trop sèche, on diminue ainsi sa température en augmentant son taux d'humidité. Il est bien entendu que l'eau injectée dans la vapeur se transforme instantanément en vapeur.As can be seen in this graph in Figure 3, the steam is sent into the ramp as soon as the paper or material to be dried is broken. A few seconds later, water is injected into the steam for safety and efficiency reasons. In fact, the vapor being too dry, its temperature is thus reduced by increasing its humidity. It is understood that the water injected into the vapor instantly turns into vapor.
Comme il est également visible sur ce graphe, l'apport d'eau est arrêté avant la fin de l'injection de vapeur. Ainsi on évite toute formation possible de gouttelettes d'eau.As can also be seen in this graph, the water supply is stopped before the end of the steam injection. This avoids any possible formation of water droplets.
Ainsi, grâce à ce système de prévention, l'incendie est évité en supprimant l'air compris dans le volume délimité par les surfaces infrarouges 6, le papier ou autre surface à sécher et les hottes puisque cet espace est rempli immédiatement par de la vapeur.Thanks to this prevention system, fire is prevented by removing the air included in the volume delimited by the
En conséquence, à chaque arrêt, un système automatique de commande envoie dans un ensemble de rampes de pulvérisation 7, un flux de vapeur dans lequel est ajouté de l'eau ; de préférence, la vapeur correspond pour 1 kg à 1,6 m³ de vapeur à la pression atmosphérique.Consequently, at each stop, an automatic control system sends into a set of
Le cycle est entièrement automatisé par gestion par automate. La vapeur, contrairement à l'eau, ne pollue pas la surface du papier. Comme on peut le voir sur la figure 3, le cycle automatique est de 15 secondes, mais il est également prévu un bouton poussoir manuel qui permet de maintenir le système en fonction si besoin est.The cycle is fully automated by automated management. Steam, unlike water, does not pollute the surface of the paper. As can be seen in Figure 3, the automatic cycle is 15 seconds, but there is also a manual push button that keeps the system running if necessary.
La figure 2 représente schématiquement le dispositif d'alimentation en vapeur et en eau jusqu'aux rampes de pulvérisation 7.FIG. 2 schematically represents the device for supplying steam and water to the
Le circuit de régulation de vapeur et son mélange avec l'eau est représenté sur la figure 2. De l'air est envoyé à une pression d'environ 6 bars dans la vapeur qui elle, est à une pression minimale de 3 bars. Cette vapeur sous pression passe dans une tubulure de désurchauffe 10 où aboutit également le circuit d'eau sous une pression d'environ 5 bars. Le mélange vapeur/eau peut alors être envoyé aux rampes de pulvérisation 7.The steam control circuit and its mixture with water is shown in Figure 2. Air is sent to a pressure of about 6 bars in the steam which is at a minimum pressure of 3 bars. This pressurized steam passes through a
Claims (5)
- A drying unit comprising a bank of radiant heaters (6) for drying a sheet material passing in front of a radiant surface constituted by the radiant heaters, an extractor hood (2), a blower hood (3) and a spray system for emitting a flow of vapour to prevent a fire, characterised in that the extractor hood (2) and the blower hood (3) are disposed on either side of the bank of radiant heaters according to the direction of passage of the sheet material in order to define a space between the radiant surface, the surface of the sheet material to be dried and the hoods and in that the spray system consists of a spray bank (9) arranged to emit during a spray cycle a flow of vapour directly into the said space in response to a detection of stoppage of the passage of the sheet material, in order to prevent a fire.
- The unit according to claim 1 in which the said space is filled with vapour in less than 15 seconds.
- The unit according to claim 1 in which water is added to the vapour a few seconds after the commencement of the vapour cycle, said injection of water being stopped a few seconds before the end of the vapour cycle.
- The unit according to claim 1 in which the spray bank (7) is disposed in the bottom part of the covering of one of the hoods (2 or 3).
- The unit according to claim 4, in which the spray bank (7) is disposed in the bottom part of the cover of the extractor hood (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9009388 | 1990-07-23 | ||
| FR9009388A FR2664917B1 (en) | 1990-07-23 | 1990-07-23 | FIRE PREVENTION SYSTEM FOR RADIANT BURNER BATTERY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0468867A1 EP0468867A1 (en) | 1992-01-29 |
| EP0468867B1 true EP0468867B1 (en) | 1994-12-07 |
Family
ID=9399002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91402024A Expired - Lifetime EP0468867B1 (en) | 1990-07-23 | 1991-07-19 | Drying equipment having a system to prevent fire |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5197203A (en) |
| EP (1) | EP0468867B1 (en) |
| JP (1) | JP2951761B2 (en) |
| AT (1) | ATE115212T1 (en) |
| DE (1) | DE69105657T2 (en) |
| ES (1) | ES2067888T3 (en) |
| FR (1) | FR2664917B1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2928432B2 (en) * | 1993-02-16 | 1999-08-03 | 東京エレクトロン株式会社 | Semiconductor wafer steam drying apparatus, fire extinguishing method therefor, and cleaning system |
| JP2731827B2 (en) * | 1995-04-14 | 1998-03-25 | 日本ボールドウィン株式会社 | Web drying equipment |
| US5675912A (en) * | 1996-03-25 | 1997-10-14 | Beloit Technologies, Inc. | Safety method for a drying system |
| US7007172B2 (en) * | 2001-06-01 | 2006-02-28 | Microchip Technology Incorporated | Modified Harvard architecture processor having data memory space mapped to program memory space with erroneous execution protection |
| US6505418B1 (en) * | 2001-08-15 | 2003-01-14 | American Dryer Corporation | Apparatus and method for a clothing dryer having a fire protection system |
| KR100556503B1 (en) * | 2002-11-26 | 2006-03-03 | 엘지전자 주식회사 | Drying Time Control Method |
| WO2004090424A2 (en) * | 2003-04-01 | 2004-10-21 | Radiant Optics, Inc. | Radiant energy source systems, devices and methods |
| US7116900B2 (en) * | 2003-04-01 | 2006-10-03 | Radiant Optics, Inc. | Radiant energy source systems, devices, and methods capturing, controlling, or recycling gas flows |
| WO2005085730A2 (en) * | 2004-03-02 | 2005-09-15 | Nv Bekaert Sa | Infrared drier installation for passing web |
| FR2867263B1 (en) * | 2004-03-02 | 2006-05-26 | Solaronics Irt | DRYING INSTALLATION FOR A TILTING STRIP, IN PARTICULAR FOR A PAPER STRIP |
| DE102010028778A1 (en) * | 2010-05-07 | 2011-11-10 | BSH Bosch und Siemens Hausgeräte GmbH | Domestic appliance with a fire protection medium |
| CN112539634B (en) * | 2020-12-02 | 2022-03-01 | 蚌埠大美印务有限公司 | Corrugated container board air-dries device |
| CN114526595B (en) * | 2022-03-17 | 2022-10-04 | 湖南亿胜新材料有限公司 | Preparation device and preparation method of low-dielectric-constant silicon micro powder |
| CN115950242A (en) * | 2022-12-30 | 2023-04-11 | 广州工程技术职业学院 | Drying device and drying method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2292794A (en) * | 1938-07-05 | 1942-08-11 | Raymond P Paradise | Method of fire extinguishing |
| US2283775A (en) * | 1940-10-17 | 1942-05-19 | Factory Mutual Res Corp | Fire extinguishing method and apparatus |
| US2731732A (en) * | 1953-05-19 | 1956-01-24 | Crown Zellerbach Corp | Apparatus and method for setting and drying moisture settable ink |
| SE8205095D0 (en) | 1982-09-08 | 1982-09-08 | Infraroedteknik Ab | SETTING TO HEAT PROCESS A CONTINUOUS MATERIAL COAT, IN PARTICULAR DRYING OF A PAPER COAT, AND DEVICE FOR IMPLEMENTATION OF THE SET |
| US4658716A (en) * | 1985-04-12 | 1987-04-21 | Measurex Corporation | Infrared heating calender roll controller |
| US4653396A (en) * | 1985-05-07 | 1987-03-31 | Measurex Corporation | Recirculating air calender roll controller |
| DE3809615C1 (en) | 1988-03-22 | 1989-04-27 | H. Krantz Gmbh & Co, 5100 Aachen, De |
-
1990
- 1990-07-23 FR FR9009388A patent/FR2664917B1/en not_active Expired - Fee Related
-
1991
- 1991-07-19 AT AT91402024T patent/ATE115212T1/en not_active IP Right Cessation
- 1991-07-19 EP EP91402024A patent/EP0468867B1/en not_active Expired - Lifetime
- 1991-07-19 ES ES91402024T patent/ES2067888T3/en not_active Expired - Lifetime
- 1991-07-19 DE DE69105657T patent/DE69105657T2/en not_active Expired - Fee Related
- 1991-07-22 US US07/734,268 patent/US5197203A/en not_active Expired - Fee Related
- 1991-07-23 JP JP3206434A patent/JP2951761B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05132888A (en) | 1993-05-28 |
| ES2067888T3 (en) | 1995-04-01 |
| ATE115212T1 (en) | 1994-12-15 |
| JP2951761B2 (en) | 1999-09-20 |
| FR2664917B1 (en) | 1996-07-12 |
| US5197203A (en) | 1993-03-30 |
| DE69105657D1 (en) | 1995-01-19 |
| DE69105657T2 (en) | 1995-05-04 |
| EP0468867A1 (en) | 1992-01-29 |
| FR2664917A1 (en) | 1992-01-24 |
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