EP2298988A1 - Système de séchage pour machines à papier - Google Patents

Système de séchage pour machines à papier Download PDF

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Publication number
EP2298988A1
EP2298988A1 EP10176140A EP10176140A EP2298988A1 EP 2298988 A1 EP2298988 A1 EP 2298988A1 EP 10176140 A EP10176140 A EP 10176140A EP 10176140 A EP10176140 A EP 10176140A EP 2298988 A1 EP2298988 A1 EP 2298988A1
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EP
European Patent Office
Prior art keywords
hood
waste heat
heat boiler
cylinder
web
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.)
Granted
Application number
EP10176140A
Other languages
German (de)
English (en)
Other versions
EP2298988B1 (fr
Inventor
Pietro Saccomano Rocchi Burlamacchi
Massimo Giannecchini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novimpianti Drying Technology SRL
Original Assignee
Novimpianti Drying Technology SRL
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Application filed by Novimpianti Drying Technology SRL filed Critical Novimpianti Drying Technology SRL
Priority to PL10176140T priority Critical patent/PL2298988T3/pl
Publication of EP2298988A1 publication Critical patent/EP2298988A1/fr
Application granted granted Critical
Publication of EP2298988B1 publication Critical patent/EP2298988B1/fr
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    • 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
    • D21F5/20—Waste heat recovery
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • D21F5/028—Heating the cylinders using steam
    • 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
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/044—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using air hoods over the cylinders
    • 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
    • D21F5/18—Drying webs by hot air
    • D21F5/181—Drying webs by hot air on Yankee cylinder

Definitions

  • the present invention refers to a drying and desiccating system for plants for producing web-like paper material, in particular but not exclusively, for plants for producing rolls of toilet paper.
  • the product that must be dried is prepared and sent to the drying and desiccating system after a preliminary pressing step.
  • the sheet of paper being processed contains a low content of solid part, equal to about 35% ⁇ 40% at a temperature of around 35°C.
  • the pressing step is not capable of eliminating all the water from the paper fibres, which must therefore be removed through evaporation.
  • the finished product in the specific case consisting of toilet paper, requires a content of solid part that is much greater than the values mentioned above. It is thus clear that in the evaporative drying step, it is necessary to extract most of the residual water content from the sheet of paper, so as to obtain a continuous sheet of paper that is sufficiently dry. After the evaporative drying and desiccating step, the sheet of paper is stored in reels so as to be subsequently processed (so-called "converting" step) and finally packed for delivery and for the final retail selling.
  • the evaporative drying and desiccating step of toilet paper is currently carried out through a system provided with two separate devices, which act simultaneously, however, upon the sheet of paper during such a drying and desiccating step.
  • a first drying device consists of a high yield hood, which provides for blowing hot air, at a temperature of up to about 650°C in hoods of the latest generation, on the sheet of paper being processed.
  • the hot air is normally produced with a direct fire burner.
  • High yield hoods also have the need of discharging the water vapour extracted from the sheet of paper being processed into the atmosphere.
  • the flow consisting of water vapour and of the air transporting it is called in jargon "mist”.
  • This "mist” has a high temperature, of about 400°C ⁇ 550°C in plants of the latest generation. Consequently, the dispersion in the atmosphere of the "mist” substantially cuts down the thermal efficiency of high yield hoods.
  • the sheet of paper being processed comes into contact with a cylinder heated with steam having a diameter that can vary from about 1.5 m to about 6 m.
  • the cylinder consists of a container under pressure that contains process steam up to about 10 bar G and more, inside it.
  • the steam is normally produced by conventional boilers, fire tubes, water tubes, or similar technologies, in turn equipped with (methane, LPG, gas oil, etc.) fuel burners that have a maximum combustion efficiency equal to about 90%.
  • the "mist" produced by the high yield hood can be used to preheat the process air and the comburent air with which the burners of the hood itself are fed.
  • the "mist" produced by the high yield hood can also be used to produce low temperature and low pressure steam (about 3 bar G), which can be used for feeding a steam box that is suitable for correcting the humidity cross-section.
  • low temperature and low pressure steam about 3 bar G
  • the "mist" produced by the high yield hood can finally be used to produce high pressure steam (up to 20 bar G), which can be directly reused in the drying process thanks to the presence of a boiler that operates to aid the main one.
  • the energy of the "mist” is not capable of generating all the steam necessary for the drying process, but only 60% ⁇ 70% of such steam, therefore, it is unavoidably necessary for there to be an external steam generator so as to provide for the remaining amount.
  • an external steam generator is necessary for the transient steps of the drying process, such as the start up step of the entire plant for producing the roll of paper (the so called “warm up” step) and/or the case in which the roll of paper itself is broken.
  • the general purpose of the present invention is that of making a drying and desiccating system for plants for producing web-like paper material, in particular but not exclusively for plants for producing rolls of toilet paper, that is capable of overcoming the aforementioned problems of the systems made according to the prior art.
  • one purpose of the present invention is that of making a drying and desiccating system for plants for producing web-like paper material that has no external steam generator whatsoever, so as to be completely independent both during the normal drying step of the paper, and during the transient steps.
  • Another purpose of the invention is also that of making a drying and desiccating system for plants for producing web-like paper material, in which both the thermal conditions of the hood, and those of the boiler, can be regulated in a completely independent manner, making it possible to regulate the temperature, operation pressures and circulating air masses that are completely different for the two separate drying devices (hood and boiler).
  • a further purpose of the invention is finally that of making a drying and desiccating system for plants for producing web-like paper material, that is capable of reducing both the energy consumption of the overall plant, and the pollutant emissions that are dispersed into the atmosphere by the plant itself, since, as previously outlined, the independent regulation of the hood and boiler allows the thermal conditions to be configured in the most suitable way for the type of paper being processed.
  • FIG 1 an evaporative drying and desiccating system, which can be used inside a plant for producing web-like paper material is shown, made according to the present invention.
  • the system is wholly indicated with reference numeral 10.
  • the drying and desiccating system 10 firstly comprises a first drying device 12, of the heated rotating cylinder type, also called “Yankee cylinder", on which the web-like paper material to be desiccated (not shown) is dynamically wound, made up of a sheet of paper having a high water content.
  • the sheet of paper reaches the Yankee cylinder 12 from the previous processing station, typically a pressing station, which is well known in the state of the art and shall therefore not be described in detail in the present description.
  • the amount of water present in the sheet itself can vary, up to more than 60% by weight.
  • the Yankee cylinder 12 typically has a diameter that can vary from about 1.5 m to about 6 m, whereas its width is equal to the width of the most common standard formats of reels used in plants for processing paper.
  • the Yankee cylinder 12 is made in the form of a pressurised steam container, which contains a pipe system (not shown) inside it, for the removal of the condensate.
  • the drying and desiccating system 10 therefore, comprises a second drying device 14, of the hood type, which at least partially covers the Yankee cylinder 12 and that is capable of both blowing high temperature dry air on the sheet of paper wound on said Yankee cylinder 12, and sucking the moist air, also at high temperature,and in jargon called "mist", released from the sheet of paper itself during its desiccation step.
  • the dry air blown by the hood 14 typically has a temperature that can reach about 700°C and more, whereas the moist air extracted from the sheet of paper can have a temperature of up to 450°C and more.
  • the high temperature dry air, blown by the hood 14, is produced by a burner 16 that uses a fuel (for example methane, LPG or gas oil) fed through a suitable feed pipe 18.
  • a fuel for example methane, LPG or gas oil
  • Air drawn from the atmosphere and conveyed, through a suitable inlet pipe 20 and by means of a fan 22, to the burner 16 itself, is used as a comburent.
  • the flow of combusted gas and air in outlet from the burner 16 forms the dry air for drying and desiccating, which is sent in pressure to the hood 14 through one or more inlet pipes 24.
  • the moist air at high temperature, extracted from the hood 14 from the sheet of paper being processed, is on the other hand conveyed through one or more release pipes 26 and is at least partially sent, by means of a recirculation fan 28, to the burner 16 so that it can be heated and reused by the hood 14 itself for drying the sheet of paper.
  • the remaining part of moist air at high temperature extracted from the hood 14 is finally sent, through the release pipes 26, towards an air-air heat exchanger 30 (not always present), where it gives up part of its heat to the outside air to be sent to the burner 16, and reintegration air, through the inlet pipe 20, and is therefore expelled from the system 10 by means of an exhaust and recirculation fan 32.
  • At least one waste heat boiler 34 is arranged, fed by such moist air or "mist” and that is able to generate high pressure steam (between about 10 bar G and about 20 bar G) so as to in turn feed a thermocompressor 36 and a reintegration or "make-up" valve 70, through a delivery pipe 40, which deliver the steam to the Yankee cylinder 12.
  • the steam produced by the waste heat boiler 34 thus minimises, in the system 10, the use of a conventional fuel boiler for feeding the Yankee cylinder 12.
  • auxiliary burner 58 which uses a fuel drawn through a first feed pipe 60 and that draws air, used as a comburent, directly from the atmosphere.
  • the comburent air is conveyed to the auxiliary burner 58 through a second feed pipe 62, directly connected with the inlet pipe 20 which brings dry air drawn from the atmosphere to the burner 16 of the hood 14, and a fan 66 for the comburent air.
  • the auxiliary burner 58 makes it possible to obtain an increase of the temperature of the moist air, arriving from the hood 14 and from a recirculation and balancing pipe system 72 and to be sent to the waste heat boiler 34, from a value of about 400°C ⁇ 420°C up to about 600°C and more. Therefore, by introducing the auxiliary burner 58 before the tube bundle of the waste heat boiler 34, it is possible for the drying and desiccating system 10, according to the invention, to not have the conventional external boiler.
  • the system 10 is provided with two separate groups for feeding the hood 14 in cascade on the waste heat boiler 34.
  • one or more gate valves can be foreseen, not illustrated in the figure, that make it possible to by-pass the waste heat boiler 34 and/or the auxiliary burner 58, for safety reasons.
  • the drying and desiccating system 10 therefore, comprises a first separator tank 42 that is able to collect the "flash steam” and the "blow-through steam”, as well as the hot condensates, coming from the Yankee cylinder 12 through a pipe 44. From the first separator tank 42, the flash steam and the blow-through steam are reintroduced into the thermocompressor 36 through a pipe 46, whereas the hot condensates are sent, through a return pipe 48 and by means of a first circulation pump 50 for feeding the waste heat boiler 34, to a second accumulator and separator tank 52.
  • a second circulation pump 54 pushes the condensates contained in the second accumulator and separator tank 52, through a suitable pipe 56, in the tube bundle of the waste heat boiler 34, that is thus capable of generating a biphasic fluid.
  • a biphasic fluid is sent to an upper cylinder body 68 of the waste heat boiler 34, that thus operates as a water tube boiler: the liquid part of the biphasic fluid is reintroduced into the accumulator and separator tank 52, operating as a lower cylinder body of the waste heat boiler 34, whereas the part of steam of the biphasic fluid itself, through the delivery pipe 40, feeds the thermocompressor 36 and the reintegration or "make-up" valve 70.
  • the drying and desiccating system 10 can be equipped with all the devices for controlling the level, the temperature and the pressure (not shown) that are necessary for it to operate correctly, as well as a possible electronic programmable logic control system (PLC).
  • PLC electronic programmable logic control system
  • the waste heat boiler 34 is also equipped with all the foreseen safety equipment (safety valve, manual resetting thermostat, etc.) that allow it to be approved in compliance with the directive PED 97/23/EC relative to the safety of such devices.
  • safety equipment safety valve, manual resetting thermostat, etc.
  • the drying and desiccating system for plants for producing web-like paper material achieves the purposes previously highlighted. Thanks to the presence of the waste heat boiler, which uses the energy of the exhaust “mist” of the drying devices, and of the auxiliary burner, which in turn increases the energy of such a "mist”, it is indeed possible to use the steam produced in the drying and desiccating production process, thus leading to a sensitive reduction of the incidence of specific energy per unit mass of finished product. Moreover, there is also a reduction of CO 2 emissions in the overall production process of the roll of paper, since the auxiliary burner, using "mists" at high temperature like the air in inlet to the combustion chamber, optimises the combustion process.
  • drying and desiccating system for plants for producing web-like paper material of the present invention thus conceived can in any case undergo numerous modifications and variants, all covered by the same inventive concept; moreover, all the details can be replaced by technically equivalent elements.
  • the materials used, as well as the shapes and sizes, can be any according to the technical requirements.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP10176140A 2009-09-16 2010-09-10 Système de séchage pour machines à papier Active EP2298988B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10176140T PL2298988T3 (pl) 2009-09-16 2010-09-10 Układ suszący i dosuszający do instalacji do wytwarzania podobnego do wstęgi materiału papierowego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2009A001582A IT1395745B1 (it) 2009-09-16 2009-09-16 Sistema di asciugatura ed essiccazione per impianti per la produzione di materiale cartaceo nastriforme integrante air system con impianto a vapore e caldaia.

Publications (2)

Publication Number Publication Date
EP2298988A1 true EP2298988A1 (fr) 2011-03-23
EP2298988B1 EP2298988B1 (fr) 2012-02-08

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ID=42102175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10176140A Active EP2298988B1 (fr) 2009-09-16 2010-09-10 Système de séchage pour machines à papier

Country Status (5)

Country Link
EP (1) EP2298988B1 (fr)
AT (1) ATE544904T1 (fr)
ES (1) ES2382118T3 (fr)
IT (1) IT1395745B1 (fr)
PL (1) PL2298988T3 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012175446A1 (fr) * 2011-06-20 2012-12-27 Voith Patent Gmbh Procédé et système pour la récupération de chaleur pour une section de séchage d'une machine servant à fabriquer une bande de matière
US20130153075A1 (en) * 2010-09-08 2013-06-20 Metso Paper Sweden Ab Positioning device for a drain pipe in a drying cylinder
CN103764908A (zh) * 2011-06-20 2014-04-30 沃依特专利有限责任公司 用于对制造材料幅面的机器的干燥部回收热量的方法和系统
ITMI20130775A1 (it) * 2013-05-10 2014-11-11 Novimpianti Drying Technology S R L Sistema di combustione e metodo per il riscaldamento dell'aria di processo per impianti di asciugatura della carta
DE102013110971A1 (de) 2013-10-02 2015-04-02 Wepa Kraftwerk Gmbh Verfahren zur Trocknung von Papierbahnen und Trocknungsanordnung
EP3078772A2 (fr) 2015-04-08 2016-10-12 Voith Patent GmbH Systeme d'air de traitement
CN114576987A (zh) * 2022-03-21 2022-06-03 武汉明正动力工程有限公司 一种纸机烘干系统
IT202100012182A1 (it) * 2021-05-12 2022-11-12 Mevas S R L Sistema di asciugatura ed essiccazione per la produzione di materiale cartaceo nastriforme con recupero dei vapori

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615122A (en) 1984-04-09 1986-10-07 Kimberly-Clark Corporation Method for providing steam and hot air for hooded drying cylinders
WO1999057367A1 (fr) * 1998-04-30 1999-11-11 Valmet Corporation Procede et appareil pour ameliorer la capacite de sechage d'une hotte recouvrant un cylindre yankee
WO2001027388A1 (fr) * 1999-10-08 2001-04-19 Stora Enso Ab Procede et dispositif pour l'alimentation en vapeur de la partie sechage d'une machine a papier
WO2008149249A1 (fr) * 2007-06-04 2008-12-11 Hayat Kimya Sanayi Anonim Sirketi Mise en œuvre de cogénération lors de la production de papier sanitaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615122A (en) 1984-04-09 1986-10-07 Kimberly-Clark Corporation Method for providing steam and hot air for hooded drying cylinders
WO1999057367A1 (fr) * 1998-04-30 1999-11-11 Valmet Corporation Procede et appareil pour ameliorer la capacite de sechage d'une hotte recouvrant un cylindre yankee
WO2001027388A1 (fr) * 1999-10-08 2001-04-19 Stora Enso Ab Procede et dispositif pour l'alimentation en vapeur de la partie sechage d'une machine a papier
WO2008149249A1 (fr) * 2007-06-04 2008-12-11 Hayat Kimya Sanayi Anonim Sirketi Mise en œuvre de cogénération lors de la production de papier sanitaire

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8959790B2 (en) * 2010-09-08 2015-02-24 Valmet Ab Positioning device for a drain pipe in a drying cylinder
US20130153075A1 (en) * 2010-09-08 2013-06-20 Metso Paper Sweden Ab Positioning device for a drain pipe in a drying cylinder
CN103764909A (zh) * 2011-06-20 2014-04-30 沃依特专利有限责任公司 对制造材料幅面的机器的干燥部回收热量的方法和系统
WO2012175446A1 (fr) * 2011-06-20 2012-12-27 Voith Patent Gmbh Procédé et système pour la récupération de chaleur pour une section de séchage d'une machine servant à fabriquer une bande de matière
CN103764908A (zh) * 2011-06-20 2014-04-30 沃依特专利有限责任公司 用于对制造材料幅面的机器的干燥部回收热量的方法和系统
CN103764908B (zh) * 2011-06-20 2017-03-15 沃依特专利有限责任公司 用于对制造材料幅面的机器的干燥部回收热量的方法和系统
ITMI20130775A1 (it) * 2013-05-10 2014-11-11 Novimpianti Drying Technology S R L Sistema di combustione e metodo per il riscaldamento dell'aria di processo per impianti di asciugatura della carta
WO2014181305A1 (fr) 2013-05-10 2014-11-13 Novimpianti Drying Technology S.R.L. Système et procédé de combustion pour chauffer l'air de traitement pour des systèmes de séchage de papier
DE102013110971A1 (de) 2013-10-02 2015-04-02 Wepa Kraftwerk Gmbh Verfahren zur Trocknung von Papierbahnen und Trocknungsanordnung
EP2857582A1 (fr) 2013-10-02 2015-04-08 Marsberger Kraftwerk GmbH Procédé de séchage de bandes de papier et installation de séchage
EP3078772A2 (fr) 2015-04-08 2016-10-12 Voith Patent GmbH Systeme d'air de traitement
IT202100012182A1 (it) * 2021-05-12 2022-11-12 Mevas S R L Sistema di asciugatura ed essiccazione per la produzione di materiale cartaceo nastriforme con recupero dei vapori
EP4089230A1 (fr) 2021-05-12 2022-11-16 Mevas S.r.l. Procede et installation de sechage de papier
CN114576987A (zh) * 2022-03-21 2022-06-03 武汉明正动力工程有限公司 一种纸机烘干系统

Also Published As

Publication number Publication date
ITMI20091582A1 (it) 2011-03-17
PL2298988T3 (pl) 2012-07-31
IT1395745B1 (it) 2012-10-19
ES2382118T3 (es) 2012-06-05
EP2298988B1 (fr) 2012-02-08
ATE544904T1 (de) 2012-02-15

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