EP2356281B1 - Machine pour sécher du papier essuie-tout équipée d'un système de co-génération - Google Patents

Machine pour sécher du papier essuie-tout équipée d'un système de co-génération Download PDF

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Publication number
EP2356281B1
EP2356281B1 EP08875831A EP08875831A EP2356281B1 EP 2356281 B1 EP2356281 B1 EP 2356281B1 EP 08875831 A EP08875831 A EP 08875831A EP 08875831 A EP08875831 A EP 08875831A EP 2356281 B1 EP2356281 B1 EP 2356281B1
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EP
European Patent Office
Prior art keywords
hood
machine
air
vapour
exit
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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.)
Not-in-force
Application number
EP08875831A
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German (de)
English (en)
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EP2356281A1 (fr
Inventor
Joan Vila Simon
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.)
Lc Paper 1881 S A
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Lc Paper 1881 S A
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Publication of EP2356281A1 publication Critical patent/EP2356281A1/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
    • D21F5/02—Drying on 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
    • D21F5/20—Waste heat recovery

Definitions

  • the present invention refers to a machine for drying tissue paper, according to the preamble portion of claim 1.
  • tissue paper In the paper industry machines for drying tissue paper are known, that are provided with a hood that blows hot air with a great velocity against the tissue paper, and a rotatable drying cylinder called Yankee partially covered by said hood.
  • the tissue paper is dried thanks to the combination of the drying cylinder that transmits heat by contact and the hood that dries by heat and mass transfer.
  • the machines for drying tissue comprise hood that operate with air at temperatures of 300, 400 and 500°C.
  • hoods that operate at 650 and 700°C were made, but they have problems regarding the material expansion, so that the manufacturers of said hoods use materials and manufacturing systems developed with finite element models.
  • the speeds of the blown air can reach values from 90 to 160 m/s.
  • the hood must be placed very near from the drying cylinder and the paper, leaving a distance of about one inch. However, the hood must have a separation mechanism when there is no paper, to prevent the air to be directed against the opposed cylinder because it would be dangerous, and also the separation mechanism permits the access to an operator for service.
  • the hood is divided into two parts, called respectively wet part and dry part, so that the tissue paper firstly passes by the wet part and then by the dry part of the hood.
  • the division of the hood is carried out according to the cylinder axis, because the wet and dry parts are symmetrical. At the wet part of the hood the yield is higher and more water is extracted, so it seems that a symmetrical hood is not suitable. However, in the market there are symmetrical hoods for spare parts reasons, decreasing the costs.
  • Each part of the hood has its own air circuit, so that each circuit comprises a motor fan that blows air, which is heated by heating means before it enters inside the corresponding part of the hood.
  • Said heating means of blown air can be of several kinds, such as vapour radiators, thermal oil radiators, or more usually gas burners in air vain.
  • gas burners each receives a mixture of combustible gas, e.g. natural gas, and air to feed the flame of the burner.
  • the hood extracts water evaporated from the paper. This vapour is concentrated in the circulation air so a quantity of air must be drained to outside. To compensate it, fresh air must enter from outside.
  • the hood includes respectively a feeding air input for the wet part and a feeding air input for the dry part.
  • the part of the hood on the Yankee cylinder comprises, at its external surface, a plurality of openings that are communicated with the internal part of the hood. Some openings permit the air to pass and other ones recover the wet air.
  • the wet tissue band enters the drying machine adhering it on the surface of the Yankee cylinder to be dried, and the hot air enters inside the hood to be applied against the cylinder to enter in contact with the wet tissue band. Therefore, when the cylinder rotates, the tissue band is dried, passing firstly under the wet part of the hood and then under the dry part of it.
  • the wet one and the dry one is extracted a portion of air, the exhausted one, to prevent air in the circuit with a humidity of 100%.
  • one consists on extracting the air purge from both wet and dry hoods and send it to a heat recuperator, and the other one consists on circulate the purge from the dry hood, where the air has less content of humidity, to the wet hood, and from it to outside. This is carried out this way because the two parts of the hood are symmetrical.
  • the development of the hood to be adapted to a cogeneration central is carried out passing all the cogeneration combustion gases by the two parts of the hood, the wet one and the dry one.
  • a burner in vain of these gases increases the temperature.
  • the gases pass by the aquotubular boiler to produce the vapour necessary for the Yankee cylinder. In a circuit like this, the humidity is very low.
  • Patent application WO99/57367 describes a method and an apparatus for improving the drying capacity of a hood covering a Yankee cylinder, when drying a web with a Yankee cylinder while conveying the web over the cylinder by blowing hot air jets against the web at the region of a first hood, said hot air jets having a temperature mainly lower than 550 °C.
  • the drying capacity of the drying hood is increased by blowing hot air jets against the web conveyed over the cylinder at the region of a second hood, a so called hot air hood, said hot air jets having a temperature which is higher than the temperature of the hot air jets blown against the web at the first hood, or mainly higher than 550 °C.
  • the object of the machine for drying tissue paper provided with a cogeneration system of the present invention is to solve the drawbacks of the drying machines of the state of the art, providing a greater efficiency and permitting to be adapted to a cogeneration central.
  • the machine for drying tissue paper is characterised in that the machine is provided with a cogeneration system and in that the air purge is recirculated from the wet part to the dry part before it exits the hood, and in that the dry part of the hood receives the gases from the cogeneration system.
  • the asymmetric hood permits to obtain a wet part with a greater drying surface and operating at a greater temperature, to obtain a greater yield in the drying process.
  • the cogeneration is carried out at the dry hood, because it has a lower yield and it is where the most savings can be obtained.
  • the wet hood is for increasing the production, because it has a better yield.
  • the wet part, with an embrace angle with the cylinder of 145° operates at 650°C and at an air velocity of 160 m/s
  • the dry part, with an embrace angle of 105° operates at 405°C and at an air velocity of 145 m/s.
  • the heating means for the air that enters into the hood are gas burners in air vain. Both circuits, the wet part and the dry part, of the hood have a closed operation, so that the air at the exit of the fan passes by the gas burner in vain, enters the hood, and it exits to enter again inside the fan.
  • the machine comprises a recovery boiler connected to the air purge exit of the dry part of the hood.
  • Said recovery boiler permits to obtain vapour at a temperature and pressure suitable for the machine.
  • the recovery boiler is of pyrotubular kind.
  • another kind of boiler can be used such as, e.g. aquatubular boilers.
  • the recovery boiler comprises a gas recovery zone and another zone with a housing with a gas burner.
  • both zone of the recovery boiler are placed into the same shell. Therefore, the quality of the vapour does not change if it is carried out with recovery or not.
  • two economisers are provided, one for each zone of said boiler.
  • an air-to-air recuperator that heats by heat exchange with the gases form the recovery boiler, a fresh airflow that is blown to said burners of the wet and dry parts of the hood, and to the fresh air entrance of the wet part of the hood.
  • a low-pressure, preferably 0.5 bar, vapour boiler is provided, to heat the process water.
  • thermo-compressor that mixes the vapour produced by the recovery boiler and the flash or vapour evaporated of condensates from the Yankee cylinder and extracts vapour at the feeding pressure.
  • a first expansion tank is provided through which the condensates of the Yankee cylinder pass to produce vapour flash to be recovered in the thermo-compressor, and a second expansion tank, at a lower pressure, through which a second flash at a lower pressure, preferably 2 bar, is produced, to feed the vapour box.
  • the vapour produced at the exit of the second expansion tank serves to feed a vapour box that heats the tissue paper before it enters into the Yankee cylinder, and also to heat the machine water.
  • FIG. 1 is a diagrammatical view that shows the machine for drying tissue paper of the invention.
  • the machine 1 for drying tissue paper 2 of the invention comprises a drying hood 3 divided into two parts, a wet part 3a and a dry part 3b, that blows hot air with a great velocity into a Yankee rotatable cylinder 4 on which the tissue paper 2 is placed, and each part 3a, 3b of the hood 3 including a motor fan 5a, 5b and a gas in vain burner 6a, 6b that heats the air from the fan 5a, 5b before it enters into the corresponding part of the hood 3a, 3b.
  • Both circuits, wet part 3a and dry part 3b, of the hood 3 have a closed operation, so that the air at the exit of the fan 5a, 5b passes through the gas in vain burner 6a, 6b, it enters inside the hood 3, and it exits to return to the fan 5a, 5b.
  • the hood 3 is geometrically asymmetric, so that the wet part 3a presents a greater drying surface and it works at a higher temperature with respect to the dry part 3b. Hence, it is obtained a higher yield in the drying process.
  • the hood 3 At the hood 3 it is provided an exit for extracting a purge of exhaust air 7, in this case the purge 7 is recirculated from the wet part 3a to the dry part 3b before it exits said hood 3.
  • the dry part 3b of the hood 3 receives the gases 8 from a cogeneration system.
  • the cogeneration is carried out in the dry hood, because it is the one that has a lower yield and it is where more savings can be obtained.
  • the wet hood is specialised in increasing the production, because it has a better yield.
  • the machine comprises a recovery boiler 9, of pyrotubular kind, connected to the air purge exit 7 of the dry part 3b of the hood 3.
  • the cogeneration gas enters at 405°C, at the exit the dry part of the hood the gases are at 310°C yet, with a humidity of 0.0851 Kg H 2 O/Kg dry.
  • Said recovery boiler 9 is a mixed boiler, with a gas recovery zone and another zone with a housing with a gas burner, both zones being placed inside the same shell, so that the quality of the vapour does not change if it is carried out with recovery or not.
  • the recovery boiler 9 provides vapour at 17 bars and at a temperature of 222°C.
  • an air-to-air recuperator 11 that heats, by heat exchange with the gases from the recovery boiler 9, a fresh airflow 12 that is blown to the burners 6a, 6b of the hood 3 and to the entrance of the wet part 3a of the hood 3.
  • vapour boiler 13 At the exit of the air-to-air recuperator 11, downstream in the circuit, a vapour boiler 13 at 0.5 bars is provided to heat the process water and the manufacturing section.
  • thermo-compressor is provided, that mixed the vapour at 17 bars produced by the recovery boiler 9 and the condensate flow from the Yankee cylinder 4, and it extracts vapour at 8 bars, that is the feeding pressure.
  • first expansion tank through which the condensates of the Yankee cylinder pass to promote the flow to be recovered
  • second expansion tank through which said flow to be recovered passes to produce vapour at 3 bar.
  • the vapour produced at the exit of the second expansion tank serves to feed a vapour box that heats the tissue paper before it enters inside the Yankee cylinder, and to heat the machine water.
  • This solution even tough is usual for a conventional paper machine, is new in the case of tissue paper machines, where vapour boxes are usually not used.
  • the exit gases from the boiler are finally at 155°C.
  • the water of the recovery boiler whose entrance is at 47°C, will be heated by a plate exchanger with the water from the cogeneration central, it will pass by a degasifier and it will enter inside the boiler at 105°C.
  • the gases at the degasifier exit will be at 148°C.
  • the model with no post-combustion has been fixed, operating the hood 3 only with the recovery gases. Once fixed the reached production, another model is carried out, this time with cogeneration central, keeping the production of the paper machine 1, and therefore the evaporation inside the hood 3.
  • the boiler 9 in these conditions produces less vapour than that the machine 1 needs to operate.
  • the production calculation serves to determine the yield of the assembly. Only in the case of heating of water, it is supposed that it will be for all the produced vapour.
  • the production will be of 4,800 kg/h of vapour at 17 bars and 3,510 kg/h vapour at 2 bars, with a recovery in the boiler of 5,503 kw.
  • the used hot water will be used to heat the loss of condensates in the operation of live vapour (vapour box) 4,000 kg/h of fresh water of the boiler from 15°C to 80°C, temperature at which it will enter inside the degasfier. Furthermore, 16 m3/h of fresh feeding water of the paper machine will be heated to 70°C. In this step of heating water 1,345 kw will be recovered.
  • the heat will be recovered, passing from 405°C to 310°C, using 3,614 kw.
  • the recovered assembly will be of 3,614 + 5,503 + 1,345, that is a total of 10,462 kw. If the gases at the exit of the cogeneration central had a power of 10,563 kw, the recovery yield is, therefore, of 99,9%.
  • the cogeneration central is based in an 18V34SG motor.

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Claims (13)

  1. Machine (1) pour sécher du papier essuie-tout (2), comprenant une hotte de séchage (3) divisée en deux parties, une partie humide (3a) et une partie sèche (3b), qui souffle de l'air chaud à grande vitesse vers un cylindre rotatif Yankee (4), sur lequel est placé le papier essuie-tout (2) à sécher, chaque partie (3a, 3b) de la hotte (3) comprenant un moto-ventilateur (5a, 5b) et des moyens de chauffage (6a, 6b) qui chauffent l'air venant du ventilateur (5a, 5b) avant qu'il entre dans la partie correspondante de la hotte (3a, 3b), et la hotte (3) comprenant une sortie pour évacuer une purge d'air d'échappement (7), la hotte (3) ayant une géométrie asymétrique, la partie humide (3a) présentant une surface de séchage plus grande et fonctionnant à une température plus élevée que celle de la partie sèche (3b), caractérisée en ce que la machine est équipée d'un système de cogénération et en ce que la purge d'air (7) est remise en circulation de la partie humide (3a) vers la partie sèche (3b) avant qu'elle sorte de la hotte (3), et en ce que la partie sèche (3b) de la hotte (3) reçoit les gaz (8) du système de cogénération.
  2. Machine (1) selon la revendication 1, caractérisée en ce que la partie humide (3a), formant un angle de recouvrement (« embrace angle ») de 145° avec le cylindre, fonctionne à 650 °C et à une vitesse d'air de 160 m/s, et la partie sèche (3b), formant un angle de recouvrement (« embrace angle ») de 105°, fonctionne à 405 °C et à une vitesse d'air de 145 m/s.
  3. Machine (1) selon la revendication 1, caractérisée en ce que lesdits moyens de chauffage de l'air qui entre dans la hotte (3) sont des brûleurs à gaz à veine d'air (6a, 6b).
  4. Machine (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend une chaudière de récupération (9) raccordée à la sortie de purge d'air (7) de la partie sèche (3b) de la hotte (3).
  5. Machine (1) selon la revendication 4, caractérisée en ce que la chaudière de récupération (9) est de type pyrotubulaire.
  6. Machine (1) selon la revendication 4 ou 5, caractérisée en ce que la chaudière de récupération (9) comprend une zone de récupération de gaz et une autre zone avec une enceinte avec un brûleur à gaz.
  7. Machine (1) selon la revendication 6, caractérisée en ce que les deux zones de la chaudière de récupération (9) sont placées dans la même enveloppe.
  8. Machine (1) selon la revendication 6 ou 7, caractérisée en ce qu'il est prévu, à la sortie de la chaudière de récupération (9), deux économiseurs (10), un pour chaque zone de ladite chaudière (9).
  9. Machine (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu, à la sortie de la chaudière de récupération (9), un récupérateur air/air (11) qui chauffe, par échange thermique avec les gaz provenant de la chaudière de récupération (9), un flux d'air frais (12) qui est amené auxdits brûleurs (6a, 6b) des parties humide (3a) et sèche (3b) de la hotte (3), et à l'entrée d'air frais de la partie humide (3b) de la hotte (3).
  10. Machine (1) selon la revendication 9, caractérisée en ce qu'il est prévu, à la sortie du récupérateur air-air (11), une chaudière à vapeur (13) basse pression, de préférence 0,5 bar, pour chauffer l'eau du procédé.
  11. Machine (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu un thermocompresseur, qui mélange la vapeur produite par la chaudière de récupération (9) et la vaporisation éclair ou la vapeur évaporée des condensats du cylindre Yankee (4) et évacue la vapeur à la pression d'alimentation.
  12. Machine (1) selon la revendication 11, caractérisée en ce qu'il est prévu un premier réservoir d'expansion, à travers lequel passent les condensats du cylindre Yankee (4) pour produire la vaporisation éclair destinée à être récupérée dans le thermocompresseur, et un second réservoir d'expansion, à une pression plus basse, à travers lequel une seconde vaporisation éclair est produite à une pression plus basse, de préférence 2 bars, pour alimenter le coffret de vapeur.
  13. Machine (1) selon la revendication 12, caractérisée en ce que la vapeur produite à la sortie du second réservoir d'expansion sert à alimenter un coffret de vapeur qui chauffe le papier essuie-tout (2) avant qu'il entre dans le cylindre Yankee (4), et à chauffer également l'eau de la machine.
EP08875831A 2008-10-24 2008-10-24 Machine pour sécher du papier essuie-tout équipée d'un système de co-génération Not-in-force EP2356281B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2008/054398 WO2010046730A1 (fr) 2008-10-24 2008-10-24 Machine pour sécher du papier essuie-tout équipée d'un système de co-génération

Publications (2)

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EP2356281A1 EP2356281A1 (fr) 2011-08-17
EP2356281B1 true EP2356281B1 (fr) 2012-10-03

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EP08875831A Not-in-force EP2356281B1 (fr) 2008-10-24 2008-10-24 Machine pour sécher du papier essuie-tout équipée d'un système de co-génération

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EP (1) EP2356281B1 (fr)
ES (1) ES2399034T3 (fr)
WO (1) WO2010046730A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006062235A1 (de) * 2006-12-22 2008-06-26 Voith Patent Gmbh Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn
US9459005B2 (en) 2010-09-01 2016-10-04 The Babcock & Wilcox Company Steam cycle efficiency improvement with pre-economizer
EP3078772A3 (fr) * 2015-04-08 2016-12-28 Voith Patent GmbH Systeme d'air de traitement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI88630C (fi) * 1992-06-08 1993-06-10 Valmet Paper Machinery Inc Foerfarande och anordning foer att effektivera funktionen av ett yankeepressparti i en mjukpappersmaskin
FI110622B (fi) * 1998-04-30 2003-02-28 Metso Paper Inc Menetelmä ja laite jenkkisylinterin kattavan huuvan kuivatuskapasiteetin parantamiseksi
WO2001000925A1 (fr) * 1999-06-29 2001-01-04 Valmet-Karlstad Ab Appareil et procede permettant de fabriquer du papier de soie texture

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WO2010046730A1 (fr) 2010-04-29
ES2399034T3 (es) 2013-03-25
EP2356281A1 (fr) 2011-08-17

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