EP2826916B1 - Trocknungsanordnung für ein Zellstoffherstellungsverfahren, Steuerungssystem für einen Trockner und Verfahren für einen Trockner - Google Patents

Trocknungsanordnung für ein Zellstoffherstellungsverfahren, Steuerungssystem für einen Trockner und Verfahren für einen Trockner Download PDF

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Publication number
EP2826916B1
EP2826916B1 EP13176610.7A EP13176610A EP2826916B1 EP 2826916 B1 EP2826916 B1 EP 2826916B1 EP 13176610 A EP13176610 A EP 13176610A EP 2826916 B1 EP2826916 B1 EP 2826916B1
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EP
European Patent Office
Prior art keywords
dryer
air
cooling section
lower cooling
airborne
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EP13176610.7A
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English (en)
French (fr)
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EP2826916A1 (de
Inventor
Johan Lindholm
Paavo Antero Sairanen
Esko Similä
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Valmet Technologies Oy
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Valmet Technologies Oy
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Priority to EP13176610.7A priority Critical patent/EP2826916B1/de
Priority to CN201410306412.8A priority patent/CN104294697B/zh
Publication of EP2826916A1 publication Critical patent/EP2826916A1/de
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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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0036—Paper-making control systems controlling the press or drying section

Definitions

  • the present invention relates to an improved dryer structure for a pulp making process. Further, the present invention relates to an improved control system for a dryer and an improved control method for a dryer.
  • a wet web such as a pulp web arrives with a dry matter content of approximately 50 % and is usually fed from above into the dryer structure.
  • Several blowing fan levels act over the whole cross-sectional area of the web and over the dryer length.
  • a drying gas is blown, which is e. g. hot air, steam or any other medium suitable for the purpose, through a nozzle from both sides towards the web.
  • the web travels inside the dryer structure back and forth moving from an upper level towards the lower part of the dryer structure.
  • the dry matter content of the web is typically about 90 %.
  • Such a known dryer structure for a pulp web is for example shown in Fig. 1 and Fig. 2 .
  • a building 100 contains a dryer section made of a lower part 123, a supply part 124, a dryer main part 122, and an upper exhaust part 121 in that order.
  • the dryer section is designed as an entity as indicated in Fig. 1 and Fig. 2 by shading.
  • the lower part 123 acts as a cooling section having integrated cooling section fans for supplying cooling air to the cooling section 123 and away from the cooling section into the building 100.
  • the supply part 124 receives supply air from outside the building 100 and sends the supply air to the dryer main part 122 to perform the drying of the pulp web, and from there to the upper exhaust part 121. From the upper exhaust part 121 the exhaust air is exhausted to outside the building 100. From the upper exhaust part 121 the exhaust air is exhausted to a heat recovery 131 where supply air can be preheated and delivered to the supply part 124.
  • the cooling section 123 receives the cooling air from within the building 100 or from outside the building 100, see reference sign 133, and supplies the cooling air to the building 100, see reference sign 139. From the supply part 124, the air is supplied to the dryer main part 122 to perform the drying of the pulp web, and from there to the upper exhaust part 121, as is shown by reference sign 132. From the upper exhaust part 121 the exhaust air is exhausted to a heat recovery system, see reference sign 131.
  • GB 1 216 858 A discloses a building which accommodates two paper or paper pulp dryers enclosed in two hoods parallel to and spaced from each other.
  • WO 01/63044 A1 discloses a drying section provided with drying cylinders.
  • the drying section is covered by a hood, and has one row of drying cylinders and below them another row of suction rolls, the suction rolls being arranged between the drying cylinders and below them.
  • a web to be dried travels forward alternatively over the periphery of the drying cylinders and the periphery of the suction rolls.
  • DE 11 2010 001 537 T5 discloses a plant having a dryer unit.
  • the dryer unit has several drying.
  • a wet web travels over the periphery of the drying rolls in a slalom travel between two rows of cylinders.
  • an improved control system for a dryer and an improved control method for a dryer shall be provided.
  • the above object is solved by a dryer structure having the features of claim 1.
  • the above object is solved by a control system having the features of claim 7.
  • the control method the above object is solved by a control method having the features of claim 12. Further developments are stated in the dependent claims.
  • a dryer structure for a pulp making process comprises a compact dryer unit consisting of an integrated exhaust part on one end side of said dryer unit, a dryer part arranged adjacent to the exhaust part, and a bottom part on the opposite end side of said dryer unit.
  • the dryer structure further comprises means for supplying air to the bottom part and means for exhausting air from the exhaust part. Further, the bottom part can be arranged adjacent to the dryer part.
  • the dryer structure comprises air supply means for supplying air from the bottom part to the exhaust part.
  • the supply air from the bottom part does not go to the building inner space beside the entity of bottom part, dryer section, and exhaust part but directly upwards to the sections above the bottom part.
  • the air can immediately be used for drying.
  • the ducting in the dryer entrance side up to the dryer sections becomes short, leading to a cost reduction.
  • the exhaust part can be arranged on the top side of the dryer unit, and the bottom part can be arranged on the bottom side of the dryer unit.
  • the air supply means for supplying air from the bottom part to the exhaust part can be arranged such that it is able to supply cooling air from the bottom part as dryer part supply air.
  • cooling air ducting used in the prior art to supply cooling air to the cooling section and from the cooling section into the building inner space, can be omitted. Less fans can be provided with the same air throughput leading to a cost reduction and to less power consumption for the fan operation.
  • the compact dryer unit can be arranged within a dryer building, and the means for supplying air to the bottom part can be arranged such that the air for the bottom part is taken from within the dryer building or from outside the dryer building.
  • the cooling air is not supplied from the cooling section into the building, the cooling air does not increase the heat and humidity load in the building.
  • the dryer structure of the invention can be used in a dryer control system.
  • a control system for a dryer involved in a pulp making process comprises such a dryer structure and means for detecting/estimating/calculating at least one variable that is in direct relation to a production level of the pulp making process in the dryer structure.
  • the means for exhausting air from the exhaust part is controllable based on the variable.
  • Such a control can exhaust the exhaust air from the exhaust part, thus under-pressurizing the dryer section, and in a particular embodiment even the whole building.
  • the building supply air can be led via ducts and/or openings. There is no condensation in the building.
  • the means for supplying air to the bottom part can be controllable such that the supply air is kept at a desired value.
  • the supply air amount can be controlled for example based on the pressure in the exhaust part.
  • the control system can further comprise a pressure sensor provided in the dryer structure, the pressure sensor detecting the pressure in the dryer structure as the variable; and / or a temperature sensor provided in the dryer structure, the temperature sensor detecting the temperature in the dryer structure as the variable.
  • the bottom part can comprise no additional means for supplying cooling air beside the means for supplying air to the dryer structure.
  • the only air supply means bringing air into the dryer is the air supplier into the bottom part (for example a fan) which can be arranged upstream the bottom part, in the bottom part or downstream the bottom part in the air supply direction. If the bottom part air supplier is arranged upstream the bottom part, it can blow air into the bottom part. If the bottom part air supplier is arranged in the bottom part, it can draw and blow air into the bottom part. If the bottom part air supplier is arranged downstream the bottom part, it can draw air into the bottom part.
  • the bottom part air supplier is arranged downstream the bottom part, it can draw air into the bottom part.
  • the means for supplying air to the bottom part, the means for exhausting air from the exhaust part, and the air supply means for supplying air from the bottom part to the exhaust part can be a fan, respectively, or a fan group. Further the control system can further comprise one or more speed controller(s), one or more temperature controller(s), and one or pressure controller(s) for controlling the speed, temperature and/or pressure of the air flows.
  • the control method for an airborne dryer involved in a pulp making process comprises the steps detecting/estimating/calculating at least one variable that is in direct relation to a production level of the pulp making process in a dryer structure of the invention, supplying air to the bottom part, exhausting air from the exhaust part, and supplying air from the bottom part to the exhaust part is controlled based on the variable.
  • exhaust air is regulated by measuring the exhaust flow and air water content. Both measurements are unreliable and difficult in practice. Supply air is not regulated at all.
  • the method and structure of the invention solves both problems and contributes to energy savings and better runnability of the web.
  • the exhaust air flow is regulated based on a variable that is in direct relation to a production level of the dryer, such as the exhaust air temperature. This measurement is easy and reliable and exhaust air humidity will remain at optimum level.
  • the supply air flow is regulated by measuring air pressure in the upper part of the dryer. The supply air is optimized to maintain a desired air pad pressure for maintaining good floatation of web in upper part of the dryer. This will increase runnability and decrease web breaks and dust generation. By optimizing exhaust and supply air flow energy consumption is decreased.
  • supplying air to the dryer structure can be controlled such that the supply air is kept at a desired value.
  • the pulp dryer supply air flow is regulated so that the air pressure inside the pulp dryer keeps at the desired value.
  • Pulp dryer exhaust air is regulated based on temperature measurement/or other variable that increases with increased production level (e.g. speed, steam pressure, calculated production level).
  • the variable can be a pressure and / or a temperature in the production level of the pulp making process part.
  • cooling air from the bottom part can be supplied as the supply air to the dryer structure.
  • the method can further comprise controlling the speed, temperature and/or pressure of the air flows.
  • the pressure condition inside the dryer has direct impact on web run ability, especially in the upper drying decks of the airborne pulp dryer. For example too low pressure lifts the web towards the top nozzles meaning unstable web run and dust formation.
  • a correct pressure condition is maintained by controlling the air balance (that is controlling the air supply of the dryer based on the pressure and/or temperature in the drying section) as it is made in the method of the invention. With such a correct air balance control:
  • FIG. 3 shows a dryer and building airflows according to the first embodiment of the present invention.
  • a building 10 contains a dryer section made of a lower part acting as a lower cooling section 23, a dryer main part 22, and an upper exhaust part 21 in that order.
  • the dryer main part 22 is sandwiched by the upper exhaust part 21 and the lower part.
  • the dryer section is designed as an entity as indicated in Fig. 3 by shading. This entity is arranged on the floor/foundation of the building 10 such that the side walls and the ceiling wall of the building 10 are distanced from the side walls and the ceiling wall of the entity, as is shown in Fig. 3 .
  • the lower part acts as a lower cooling section 23 having integrated cooling section fans for supplying cooling air to the lower cooling section 23 and away from the lower cooling section 23.
  • the dryer main part 22 is immediately adjacent to the lower cooling section 23.
  • the cooling section fans supply the cooling air from the lower cooling section 23 to the dryer main part 22 to perform the drying of the pulp web, and from there to the upper exhaust part 21. From the upper exhaust part 21 the exhaust air is exhausted to outside the building 10.
  • the web drying is done. Similarly as in the prior art, a wet web such as a pulp web arrives and is fed from above into the dryer main part 22. In a contact-free drying the web travels inside the dryer main part 22 moving in a meandering way from an upper level towards the lower part of the dryer main part 22, and leaves the dryer main part 22 from the bottom thereof.
  • the lower cooling section 23 receives the cooling air from within the building 10.
  • the dryer uses integrated cooling section fans 33 to bring the air within the building 10 into the lower cooling section 23.
  • the cooling section fans 33 per se can be arranged within the building 10 or within the lower cooling section 23.
  • the cooling air of the lower cooling section 23 acts as the dryer supply air.
  • the dryer is functioning by building air, the so called building exhaust air enters from the building 10 via the lower cooling section 23 to the dryer main part 22.
  • Supply air for the building 10 is introduced through openings in the building wall or through fans at the building wall.
  • one or several fans 32 are arranged to transport the air from the lower cooling section 23 to the dryer main part 22 and further to the upper exhaust part 21. From the upper exhaust part 21 the exhaust air is exhausted to outside the building 10 by means of one or several fans.
  • the exhaust air can be exhausted to a heat recovery system 40.
  • the heat in the heat recovery system 40 can be used for example to heat water. Thereby, an improved air-water heat recovery is reached.
  • the cooling air is not supplied to the interior of the building 10 as in the prior art of Fig. 1 , but is supplied to the dryer main part 22. Thus, in the dryer of the first embodiment, the cooling air does not increase the heat and humidity load in the building 10.
  • no supply air intermediate floor is needed and separate supply air fans or ducts are not necessary.
  • control for a fan/fan group can be operated via one or several different controllers.
  • the cooling air fans 33 can be integrated to the dryer construction that is either in the lower cooling section 23 or within the building 10 at a place between the lower cooling section 23 or and the building 10 outer wall, or they can be arranged outside from the building 10.
  • the respective airflows supply, exhaust, cooling
  • a dryer upgrade and a rebuild on existing dryers can be made so that an existing supply air section underneath the dryer main part 22 can be converted to an active drying section.
  • all air that is needed in the drying process of the dryer main part 22 is introduced to the dryer main part 22 as cooling air from the lower cooling section 23.
  • FIG. 4 shows a dryer and building airflows according to the second embodiment of the present invention.
  • the second embodiment is similar to the first embodiment. In the following just the difference to the first embodiment is discussed.
  • the dryer uses integrated cooling section fans 33 to bring the air within the building 10 into the lower cooling section 23 as shown in Fig. 3 .
  • the dryer uses cooling section fans 34 to bring the air outside the building 10 into the lower cooling section 23.
  • the cooling section fans 34 per se can be arranged outside the building 10 as external cooling section fans.
  • the cooling section fans 34 can be arranged within the lower cooling section 23 and are connected via one or more tubes with the outside of the building 10 to draw in the external air.
  • the dryer is not functioning by building supply air but rather by external air.
  • Fig. 5 shows a schematic diagram of a dryer and the air flows of the present invention.
  • the schematic diagram of Fig. 5 applies for both the first and the second embodiment.
  • Fig. 5 shows the entity of the lower cooling section 23, the central dryer main part 22 and the upper exhaust part 21.
  • the lower cooling section 23 is arranged on the floor of the entity and comprises one or more cooling section fans 33.
  • four cooling section fans 33 are installed.
  • the speed of the cooling section fans 33 is controlled by speed controllers SIC.
  • the cooling section fans 33 are grouped in two groups, that is a left group of two cooling section fans 33 controlled by a left speed controller SIC, and a right group of two cooling section fans 33 controlled by a right speed controller SIC. From within the building 10 (first embodiment) or outside the building 10 (second embodiment) air is drawn by the cooling section fans 33.
  • a partition 221 is arranged between the lower cooling section 23 and the central dryer main part 22 through which the air streams from the cooling section fans 33 can pass into the dryer main part 22.
  • a temperature sensor 222 is arranged within the dryer main part 22.
  • the dryer main part 22 comprises a so called false ceiling 211 as a partition separating the dryer main part 22 from the upper exhaust part 21.
  • a pressure sensor 212 is arranged in the upper exhaust part 21 . Air is exhausted from the upper exhaust part 21 by exhausting fans 31.
  • exhausting fans 31 In the example of the Figure two exhausting fans 31 are provided outside the upper exhaust part 21, each in a line leading away from the upper exhaust part 21.
  • the speed of each of the exhausting fans 31 is controlled by a respective dedicated speed controller SIC, that is the speed of the left exhausting fans 31 is controlled by a left speed controller SIC, and the speed of the right exhausting fans 31 is controlled by a right speed controller SIC.
  • the speed controllers SIC of the exhausting fans 31 perform their control based on a temperature controller TIC supplied by temperature information from the temperature sensor 222.
  • the speed controllers SIC of the cooling section fans 33 perform their control based on a pressure controller PIC supplied by pressure information from the pressure sensor 212.
  • the pressure sensor 212 and the temperature sensor 222 detect the pressure and the temperature, respectively, in the dryer structure.
  • the sensors 212 and/or 222 detect a variable that is in direct relation to a production level of the pulp making process in the dryer structure.
  • the exhausting fans 31 are controlled based on this variable, that is the pressure and/or the temperature in the dryer structure.
  • cooling section fans 33 are controlled such that the air drawn into the lower cooling section 23 and delivered to the central dryer main part 22, is kept at a desired value that is, a desired flow speed.
  • the speed of the cooling section fans 33 is controlled based on the pressure and/or the temperature in the dryer structure.
  • the pressure and/or the temperature in the dryer structure is/are a variable that is in direct relation to a production level of the pulp, since the output of the dryer section depends thereon.
  • air is supplied to the bottom part acting as lower cooling section 23, supplied from the bottom part to the exhaust part 21 based on the pressure and/or the temperature in the dryer structure and exhausted from the exhaust part 21.
  • the supplying of air to the dryer structure that is to the bottom part is controlled such that the speed of supply air is kept at a desired value.
  • Figures 6 to 9 show side views of a dryer and the air flows of the present invention in several examples and in comparison with the prior art.
  • Fig. 6 shows a side view of a dryer of the present invention.
  • the lower cooling section 23 is supplied by cooling air from the inside of the building 10. From the lower cooling section 23, the cooling air is supplied to the dryer portion 22 per se, and further to the exhaust section 21. From the exhaust section 21, the air is exhausted out of the building 10 to a heat recovery tower 40 where the exhausted air undergoes a heat recovery process.
  • Fig. 7 shows a side view of a dryer of the prior art as a comparative example.
  • the lower cooling section 123 is supplied by cooling air from the inside of the building 100. From the lower cooling section 123, the cooling air is supplied to the building 100. Drying air is supplied to supply section 124 und from the supply section 124 to the dryer portion 122 per se, and further to the exhaust section 121. From the exhaust section 121, the air is exhausted out of the building 100 to a heat recovery tower 131 where the exhausted air undergoes a heat recovery process. Recovered heat energy is used to heat the air which is supplied as drying air to the supply section 124.
  • supply air is led underneath the dryer portion 122 from a heat recovery 131 using fan(s) and ducting. Exhaust air is sucked out from the dryer top 121 and led out via heat recovery 131.
  • Fig. 8 shows a side view of another dryer of the present invention.
  • the lower cooling section 23 is supplied by cooling air from outside of the building 10. From the lower cooling section 23, the cooling air is supplied to the dryer portion 22, and further to the exhaust section 21. From the exhaust section 21, the air is exhausted out of the building 10 to a heat recovery tower 40 where the exhausted air undergoes the heat recovery process.
  • Fig. 9 shows a side view of again another dryer of the present invention.
  • a prior art dryer for example a dryer as in the comparative example of Fig. 7
  • the lower cooling section 23 is supplied by cooling air from the inside or outside of the building 10.
  • the former supply section is converted into a part 24 of the dryer portion per se and forms the lower part of the dryer portion 22.
  • the freed space in this converted supply section 24 is equipped now with drying nozzles of the same type as in the above upper portion of the dryer portion 22 that is the main dryer portion 22, thereby the drying capacity is increased.
  • Drying air is supplied to the converted supply section 24 from the lower cooling section 23 of the dryer portion. From the converted supply section 24 the drying air is supplied to the main dryer portion 22, and further to the exhaust section 21.
  • the air is exhausted out of the building 10 to the heat recovery tower 40 where the exhausted air undergoes the heat recovery process.
  • Recovered heat energy is used to heat for example water. Thereby, an improved air-water heat recovery is reached similar as in the embodiment of Fig. 3 .
  • a dryer structure for drying a pulp web is discussed.
  • the same principle can be applied in a dryer structure for drying a paper web or a board web.
  • the at least one variable that is in direct relation to a production level of the pulp making process is detected by one or more sensors.
  • the variable does not need to be detected, the variable can be estimated or calculated.

Claims (15)

  1. Trocknerstruktur für einen Pulpe-, Papier- oder Kartonherstellprozess mit:
    einer kompakten luftgestützten Trocknereinheit bestehend aus
    einem integrierten Abgabeteil (21) an einer Endseite der luftgestützten Trocknereinheit,
    einem Luftstütztrocknerteil (22), der benachbart zu dem Abgabeteil angeordnet ist, und
    einem unteren Kühlabschnitt (23) an der entgegengesetzten Endseite der luftgestützten Trocknereinheit;
    einer Einrichtung (33, 34) zum Liefern von Luft zu dem unteren Kühlabschnitt (23); und
    einer Einrichtung (31) zum Abgeben von Luft von dem Abgabeteil (21);
    wobei eine Bahn von oben in den Luftstütztrocknerteil (22) geführt wird, im Inneren des Luftstütztrocknerteils (22) in einer sich schlängelnden Weise von einer oberen Höhe zu einem unteren Teil des Luftstütztrocknerteils (22) für ein kontaktfreies Trocknen hin und her läuft, wobei das Luftstütztrocknerteil (22) mit einem erwünschten Luftpolsterdruck eingerichtet ist zum Beibehalten eines Aufschwebens der Bahn, und den Luftstütztrocknerteil (22) von seinem Boden verlässt;
    wobei der untere Kühlabschnitt (23) benachbart zu dem Luftstütztrocknerteil (22) angeordnet ist;
    wobei der Abgabeteil (21) an der oberen Seite der Luftstütztrocknereinheit angeordnet ist, und
    der untere Kühlabschnitt (23) an der Bodenseite der Luftstütztrocknereinheit angeordnet ist,
    wobei die zu dem unteren Kühlabschnitt (23) gelieferte Luft als Kühlluft von dem unteren Kühlabschnitt (23) als Lieferluft des Trocknerteils (22) geliefert werden kann.
  2. Trocknerstruktur gemäß Anspruch 1, wobei
    die Trocknerstruktur eine Luftliefereinrichtung (32) zum Liefern von Luft von dem unteren Kühlabschnitt (23) zu dem Abgabeteil (21) aufweist.
  3. Trocknerstruktur gemäß Anspruch 2, wobei
    die Luftliefereinrichtung (32) zum Liefern von Luft von dem unteren Kühlabschnitt (23) zu dem Abgabeteil (21) so angeordnet ist, dass sie die Kühlluft von dem unteren Kühlabschnitt (23) als die Lieferluft des Trocknerteils (22) liefern kann.
  4. Trocknerstruktur gemäß einem der Ansprüche 1 bis 3, wobei
    die kompakte Trocknereinheit innerhalb eines Trocknergebäudes (10) angeordnet ist, und
    die Einrichtung (33) zum Liefern von Luft zu dem unteren Kühlabschnitt (23) so angeordnet ist, dass die Luft für den unteren Kühlabschnitt (23) aus dem Inneren des Trocknergebäudes (10) genommen wird.
  5. Trocknerstruktur gemäß einem der Ansprüche 1 bis 3, wobei
    die kompakte Trocknereinheit innerhalb eines Trocknergebäudes (10) angeordnet ist, und
    die Einrichtung (34) zum Liefern von Luft zu dem unteren Kühlabschnitt (23) so angeordnet ist, dass die Luft für den unteren Kühlabschnitt (23) von der Außenseite des Trocknergebäudes (10) genommen wird.
  6. Trocknerstruktur gemäß einem der Ansprüche 1 bis 5, wobei
    die Trocknerstruktur so aufgebaut ist, dass lediglich Luft, die in dem unteren Kühlabschnitt (23) verwendet wird, in der Trocknerstruktur verwendet wird.
  7. Steuersystem für einen Trockner, der in einem Pulpeherstellprozess involviert ist, bei dem eine Bahn von oben in einen Trocknerteil (22) geführt wird, im Inneren des Trocknerteils (22) in einer sich schlängelnden Weise von einer oberen Höhe zu einem unteren Teil des Trocknerteils (22) hin und her läuft, und den Trocknerteil (22) von seinem Boden verlässt, mit
    der Trocknerstruktur gemäß einem der Ansprüche 1 bis 6, und
    einer Einrichtung (212, 222) zum Erfassen/Abschätzen/Berechnen zumindest einer Variable, die in direkter Beziehung mit einem Produktionsniveau des Pulpeherstellprozesses in der Trocknerstruktur steht,
    wobei
    die Einrichtung (31) zum Abgeben von Luft aus dem Abgabeteil (21) auf der Basis dieser Variable steuerbar ist.
  8. Steuersystem gemäß Anspruch 7, wobei
    die Einrichtung (33, 34) zum Liefern von Luft zu dem unteren Kühlabschnitt (23) so steuerbar ist, dass die Lieferluft bei einem erwünschten Wert gehalten wird.
  9. Steuersystem gemäß Anspruch 7 oder 8, wobei
    die Variable ein Druck und/oder eine Temperatur in dem Produktionsniveau des Pulpeherstellprozessteils ist, und
    das Steuersystem des Weiteren Folgendes aufweist:
    einen Drucksensor (212), der in der Trocknerstruktur vorgesehen ist, wobei der Drucksensor den Druck in der Trocknerstruktur als die Variable erfasst; und/oder
    einen Temperatursensor (222), der in der Trocknerstruktur vorgesehen ist, wobei der Temperatursensor die Temperatur in der Trocknerstruktur als die Variable erfasst.
  10. Steuersystem gemäß einem der Ansprüche 7 bis 9, wobei
    der untere Kühlabschnitt (23) keine zusätzliche Einrichtung zum Liefern von Kühlluft außer der Einrichtung zum Liefern von Luft zu der Trocknerstruktur aufweist.
  11. Steuersystem gemäß einem der Ansprüche 7 bis 10, wobei die Einrichtung zum Liefern von Luft zu dem unteren Kühlabschnitt (23), die Einrichtung zum Abgeben von Luft aus dem Abgabeteil (21) und die Luftliefereinrichtung zum Liefern von Luft aus dem unteren Kühlabschnitt (23) zu dem Abgabeteil (21) jeweils ein Gebläse oder eine Gebläsegruppe sind, und
    das Steuersystem des Weiteren eine Geschwindigkeitssteuereinrichtung oder mehrere Geschwindigkeitssteuereinrichtungen, eine Temperatursteuereinrichtung oder mehrere Temperatursteuereinrichtungen und eine Drucksteuereinrichtung oder mehrere Drucksteuereinrichtungen zum Steuern der Geschwindigkeit, der Temperatur und/oder dem Druck der Luftströmungen aufweist.
  12. Steuerverfahren für einen Luftstütztrockner, der in einem Pulpeherstellprozess involviert ist, bei dem eine Bahn von oben in einen Trocknerteil (22) zugeführt wird, im Inneren des Trocknerteils (22) in einer sich schlängelnden Weise von einer oberen Höhe zu einem unteren Teil des Trocknerteils (22) hin und her läuft, und den Trocknerteil (22) von seinem Boden verlässt, mit den folgenden Schritten:
    Erfassen/Schätzen/Berechnen zumindest einer Variable, die in direkter Beziehung zu einem Produktionsniveau des Pulpeherstellprozesses in einer Trocknerstruktur gemäß einem der Ansprüche 1 bis 6 steht,
    Liefern von Luft zu dem unteren Kühlabschnitt (23), und
    Abgeben von Luft von dem Abgabeteil (21),
    wobei das Liefern von Luft von dem unteren Kühlabschnitt (23) zu dem Abgabeteil (21) auf der Basis dieser Variable gesteuert wird.
  13. Verfahren gemäß Anspruch 12, wobei
    das Liefern von Luft zu der Trocknerstruktur so gesteuert wird, dass die Lieferluft bei einem erwünschten Wert gehalten wird, und/oder
    die Variable ein Druck und/oder eine Temperatur in dem Produktionsniveau des Pulpeherstellprozessteils ist.
  14. Verfahren gemäß einem der Ansprüche 12 oder 13, wobei
    Kühlluft von dem unteren Kühlabschnitt (23) als die Lieferluft zu der Trocknerstruktur geliefert wird.
  15. Verfahren gemäß einem der Ansprüche 12 bis 14, wobei
    das Verfahren des Weiteren aufweist: Steuern der Geschwindigkeit, der Temperatur und/oder des Drucks der Luftströmungen.
EP13176610.7A 2013-07-16 2013-07-16 Trocknungsanordnung für ein Zellstoffherstellungsverfahren, Steuerungssystem für einen Trockner und Verfahren für einen Trockner Active EP2826916B1 (de)

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EP13176610.7A EP2826916B1 (de) 2013-07-16 2013-07-16 Trocknungsanordnung für ein Zellstoffherstellungsverfahren, Steuerungssystem für einen Trockner und Verfahren für einen Trockner
CN201410306412.8A CN104294697B (zh) 2013-07-16 2014-06-30 纸浆制造过程的干燥机结构以及干燥机的控制系统和方法

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EP3733964A1 (de) * 2019-04-29 2020-11-04 Valmet Technologies Oy Anordnung und verfahren für einen zellstofftrockner
EP3736375B1 (de) * 2019-05-06 2023-10-25 Valmet Technologies Oy Verfahren und anordnung zur steuerung des energieverbrauchs in einem verfahren zur herstellung einer faserstoffbahn

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Publication number Priority date Publication date Assignee Title
US2460042A (en) * 1945-01-13 1949-01-25 Rice Barton Corp Method of making cockle paper
FI46644B (de) * 1967-11-10 1973-01-31 Valmet Oy
SE450776B (sv) * 1983-05-19 1987-07-27 Asea Ab Anordning for reglering av fukthalten hos en massabana
JP2909285B2 (ja) * 1991-12-03 1999-06-23 三菱重工業株式会社 製紙機械のドライヤ
FI108871B (fi) * 1998-07-06 2002-04-15 Metso Paper Inc Menetelmä ja laite päällystetyn rainan kuivattamiseksi
FI20000387A0 (fi) * 2000-02-21 2000-02-21 Valmet Corp Menetelmä ja laitteisto ilmanpoistojen ja -syöttöjen järjestämiseksi kuivatusosassa
JP5266588B2 (ja) * 2009-04-07 2013-08-21 デュプロ精工株式会社 再生パルプ製造装置、古紙処理装置及び古紙処理方法
CN101929095A (zh) * 2009-06-25 2010-12-29 铨展环能设备(昆山)有限公司 纸机烘缸罩送排风系统
CN101838952B (zh) * 2010-05-12 2011-11-16 陕西福辰环保科技有限公司 沼气热风纸板干燥系统
CN201850466U (zh) * 2010-10-29 2011-06-01 江苏理文造纸有限公司 一种烘干房

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EP2826916A1 (de) 2015-01-21
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