EP2644771B1 - Dampftrocknungsvorrichtung und Verfahren - Google Patents

Dampftrocknungsvorrichtung und Verfahren Download PDF

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Publication number
EP2644771B1
EP2644771B1 EP20120161761 EP12161761A EP2644771B1 EP 2644771 B1 EP2644771 B1 EP 2644771B1 EP 20120161761 EP20120161761 EP 20120161761 EP 12161761 A EP12161761 A EP 12161761A EP 2644771 B1 EP2644771 B1 EP 2644771B1
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EP
European Patent Office
Prior art keywords
steam
dryer
compressor
low pressure
desuperheater
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Application number
EP20120161761
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English (en)
French (fr)
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EP2644771A1 (de
Inventor
Pertti Heikkilä
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Valmet Technologies Oy
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Valmet Technologies Oy
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Priority to EP20120161761 priority Critical patent/EP2644771B1/de
Priority to CN2013201473268U priority patent/CN203320337U/zh
Publication of EP2644771A1 publication Critical patent/EP2644771A1/de
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Publication of EP2644771B1 publication Critical patent/EP2644771B1/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
    • 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
    • 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

Definitions

  • the present inventions regards to a steam dryer device for paper, board or pulp webs.
  • a steam dryer device comprises a pressure steam source for generating pressurized steam, and a dryer for drying the paper, board or pulp web using the steam. Further, the present inventions also regards to a respective method.
  • paper and pulp webs are dried.
  • the drying of paper and pulp webs is performed in several different ways.
  • One possibility of drying paper and pulp webs is a drying process by steamheated air.
  • steamheated air dryers for paper and pulp webs the available steam pressure sets an upper limit for blowing air temperature in the dryer.
  • Document WO 2010/096012 A1 discloses a device having the features of the preamble of claim 1.
  • the device has a main steam line in which a compressor is arranged and which leads to a dryer.
  • a direct conduit bypasses the compressor.
  • a cooling conduit is connected to the main steam line downstream of the compressor, that is between the compressor and the dryer.
  • US 5 210 958 A discloses a device having a compressor in a main line of the device.
  • the compressor is bypassed by a recirculation line.
  • a first desuperheater is arranged upstream of the compressor and a second desuperheater is arranged downstream of the compressor.
  • the desuperheaters are arranged in line to the compressor.
  • WO 01/27388 A1 discloses a device for increasing the drying capacity of a steam group in a drying section. A main steam flow is directed to a thermocompressor.
  • the object of the present invention to provide an improved steam dryer device and an improved drying method.
  • the above object is solved by a steam dryer device having the features of claim 1.
  • the drying method the above object is solved by a drying method having the features of claim 6. Further developments are stated in the dependent claims.
  • a steam dryer device for paper, board or pulp webs comprises a low pressure steam source for generating low pressure steam, a mechanical compressor for increasing the pressure of the low pressure steam, and a dryer for drying the paper, board or pulp web using the steam from the mechanical compressor.
  • MVR Mechanical vapor recompression
  • a mechanical compressor enables a higher pressure rise than a steam ejector.
  • the power consumption in the compressor can be compared to lost generator power in case of a steam ejector.
  • this comparison goes in favor of a mechanical compressor, because the lost generator power due to a steam ejector is larger than the power consumed by a mechanical compressor.
  • a bypass can bypass the mechanical compressor to allow drying the paper, board or pulp web using the steam from the low pressure steam source.
  • the dryer device is made able to switch between low pressure steam supply and high pressure steam supply to the dryer.
  • a valve can be used for bypassing the mechanical compressor.
  • an electric motor can be used for driving the mechanical compressor.
  • Mechanical compressors use mainly electric motor as source of power, however also other methods to drive the compressor are possible.
  • a desuperheater is used for cooling the steam.
  • the desuperheater is arranged between the mechanical compressor and the dryer.
  • the dryer can be an air dryer or a cylinder dryer.
  • the mechanical compressor can run all the time if a higher steam pressure is needed continuously.
  • the mechanical compressor can run only a part of the time if higher steam pressure is needed only occasionally. Thereby, the flexibility of steam supply is raised, and whether high steam pressure is used for drying can be adapted to the particular existing temporary demand.
  • the compressor suits well for boosting of old airborne pulp dryers.
  • the installation work can be done mainly during normal machine operation, and only a short shutdown period is needed to connect the compressor to the steam line.
  • a short shutdown time is a very important aspect in the dryer rebuilds.
  • installation time can be saved and the restart of the plant can be advanced.
  • the mechanical compressor is useful for example in following cases:
  • FIG. 1 shows one steam dryer device according to one embodiment of the present invention.
  • FIG. 1 shows a steam dryer device according to one embodiment.
  • steam having a low pressure is generated in a low pressure steam source 1 shown on the left side in FIG. 1 .
  • a main line 1a extends to a dryer 3 for drying a paper web, board web or pulp web.
  • a compressor line 2a extending from and returning to the main line 1a.
  • this compressor line 2a there is provided a compressor 2.
  • the compressor line 2a returns to the main line 1a, so that the compressor 2 is situated between the starting point of the compressor line 2a and the end point of the compressor line 2a.
  • a first valve 21 is arranged in the compressor line 2a.
  • a second valve 22 in the compressor line 2a.
  • a first main line valve 11 in the portion of the main line 1a, which is bypassed by the compressor line 2a.
  • the first main line valve 11 is provided in the main line 1a between the starting point of the compressor line 2a and the end point thereof.
  • the main line 1a can be blocked so that the steam from the low pressure steam source 1 is delivered through the compressor line 2a and via the compressor 2 further on to the portion of the main line 1a provided downstream of the end point of the compressor line 2a and further to the dryer 3.
  • the compressor 2 is a mechanical compressor and increases the pressure of the low pressure steam.
  • the part of the main line 1a having the first main line valve 11, can be regarded as a bypass as defined in the claims.
  • the first main line valve 11 can be an on/off valve which is closed when the compressor 2 is in operation.
  • the first main line valve 11 can be a back-pressure valve which prevents a steam backflow when the compressor 2 is in operation.
  • the first valve 21 and the second valve 22 are on/off valves. Both the first valve 21 and the second valve 22 are open when the compressor 2 is in operation. When the first valve 21 and the second valve are closed, the compressor 2 can be isolated from the steam system for example in case of a maintenance etc.
  • the first main line valve 11, the first valve 21 and the second valve 22 serve for bypassing the mechanical compressor.
  • the mechanical compressor 2 can be operated permanently if higher steam pressure is needed continuously, and the mechanical compressor 2 can be operated only a determined part of time if higher steam pressure is needed only occasionally. When the mechanical compressor 2 is operated permanently or occasionally, this operation can be performed with full open the first valve 21 and second valve 22 to reach a rather high steam pressure. On the other hand, the mechanical compressor 2 can be operated permanently or occasionally by having the first valve 21 and second valve 22 open. Thereby, a flexible steam supply can be established which can be adapted to the particular need of steam supply.
  • the mechanical compressor 2 can be operated by adapting the compressor speed to the particular need. In case more steam is needed, the compressor speed is increased; and in case less steam is needed, the compressor speed is decreased.
  • a second main line valve 12 Downstream of the end point of the compressor line 2a there is provided a second main line valve 12 in the main line 1a.
  • the second valve 12 is provided in the main line 1a before the dryer 3.
  • the second valve 12 serves to control the dryer steam pressure.
  • the operator can give pressure setpoint, or the operator can give a dryer temperature setpoint, or the second valve 12 can be controlled according to sheet moisture after the dryer, or the operator can give a fixed opening setpoint for the second valve 12.
  • the second valve 12 can be connected to a control device 5 which can be a PIC controller.
  • the control device 5 gathers information for example about the pressure, temperature, etc of the steam supplied in the main line 1a at a location downstream of the second valve 12, and controls the second valve 12 and the compressor 2 considering the gathered data. Thereby, the compressor 2 can be controlled considering the actual pressure of steam in the main line 1a at the entrance of the dryer 3.
  • a desuperheater 4 is used in the steam dryer device of the embodiment.
  • a desuperheater line extending from the desuperheater 4 is connected to the main line 1a at a location downstream of the compressor 2.
  • the desuperheater line extending from the desuperheater 4 is connected to the main line 1a between the endpoint of the compressor line 2a and the second valve 12 provided in the main line 1a before the dryer 3.
  • the desuperheater 4 is located after the compressor 2.
  • the purpose of the desuperheater 4 is to let drop the temperature of the steam close to the saturation temperature before the steam is delivered to the dryer.
  • the steam temperature should be close to the saturation temperature in order to keep the heat transfer efficient in the heat exchangers.
  • a compressor always increases steam superheat. If the steam is largely superheated after the compressor 2, it is beneficial to cool it close to saturation temperature with the desuperheater 4.
  • the desuperheater 4 steam conditioning is performed, that is reduction of steam temperature.
  • the desuperheater 4 can reduce the temperature in the main line 1a through the direct contact and evaporation of water.
  • the type of the desuperheater 4 is not particular limited and can be for example a desuperheater having a venturi design which uses the velocity of the steam to atomize the cooling water.
  • the desuperheater 4 can be an ejector atomizing desuperheater, an attemperator desuperheater, a surface absorption desuperheater or a mechanical atomizing desuperheater.
  • a desuperheater valve 41 In the desuperheater line extending from the desuperheater 4 to the main line 1a, there is arranged a desuperheater valve 41.
  • the desuperheater valve 41 is connected to a control device 6 which can be a TIC controller.
  • the control device 6 gathers information for example about the pressure, temperature, etc of the steam supplied in the main line 1a at a location downstream of the desuperheater 4, and controls the desuperheater valve 41 considering the gathered data. Thereby, the desuperheater valve 41 can be controlled considering the actual pressure of steam in the main line 1a.
  • the steam dryer device can be equipped with an intercooler.
  • the intercooler can be located between the compressing stages that is between the low pressure steam source 1 and the compressor 2.
  • the compressor 2 increases the steam temperature unless it is equipped with intercooling.
  • the purpose of the intercooler is to improve the performance of the compressor 2.
  • the compressor In case the compressor is of multi-stage type, it may be equipped with an intercooler between the compressing stages.
  • the presence of the intercooling is beneficial for the compressor performance especially in a case of higher compressing ratios.
  • the steam dryer device can be equipped with the intercooler and the desuperheater 4.
  • the steam dryer device can be equipped with the intercooler instead of the desuperheater 4.
  • the intercooler and the desuperheater can be omitted.
  • the present invention can be used also for cylinder dryers for pulp and paper drying.
  • the applying of the mechanical compressor in the steam dryer device serves to provide a high pressure steam supply for the dryer. Thereby, the high pressure steam is provided in an efficient and cost saving manner.
  • thermocompressor thermocompressor
  • motive steam is often taken as tapping from a back-pressure turbine, thereby the power production in the generator reduces. In other words, the motive steam is more expensive than the low pressure steam.
  • the mechanical compressor brings about a very efficient and cost saving high pressure steam supply for a dryer.
  • the present invention is applied to a pulp dryer having a production capacity of 800 ADt/d, a steam consumption of 8.5 kg/s, a steam pressure of 3.5 bar(g) and a temperature before the dryer control valves of 150 °C.
  • the objective is to raise the steam pressure from 3.5 to 4.5 bar(g).
  • the capacity of the dryer will improve by 9 % (that is from 800 to 872 ADt/d) and the steam consumption changes from 8.5 to 9.3 kg/s.
  • dryer steam pressure was elevated from 3.5 to 4.5 bar(g), leading to a capacity increase of 9 % in the dryer.
  • similar capacity improvement is possible to do also by adding dryer circulation air flow by 18 %, for example by changing circulation fan motors to larger ones, and by adding speed of the fans with inverters.
  • the power used in the circulation fans would increase by 64 % because the required power goes in by exponent 3 of the fan speed.
  • the increase in power consumption of the circulation fans would be about the same as the one needed to drive the steam compressor in the previous example. Thus, when considering the operating costs these two examples are about equal.
  • the present invention is applied to a board coating machine having seven steamheated air dryers, using steam of 8 bar(g) and having a blowing air temperature of 161 °C.
  • a compressor is used to raise the steam pressure from 8 to 14 bar(g).
  • the blowing air temperature is increased from 161 to 182 °C, giving 18 % more drying capacity.
  • the power needed to drive the compressor is calculated as follows:

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)

Claims (7)

  1. Dampftrocknervorrichtung für Papier-, Karton- oder Pulpebahnen mit
    einer Niedrigdruckdampfquelle (1) zum Erzeugen von unter niedrigem Druck stehendem Dampf,
    einem mechanischen Kompressor (2) zum Erhöhen des Drucks des unter niedrigem Druck stehenden Dampfes,
    einem Trockner (3) zum Trocknen der Papier-, Karton- oder Pulpebahn unter Verwendung des Dampfes von dem mechanischen Kompressor (2),
    einer Hauptleitung (1a), die sich von der Niedrigdruckdampfquelle (1) zu dem Trockner (3) erstreckt,
    einem Bypass, der den mechanischen Kompressor (2) umgeht, um unter niedrigem Druck stehenden Dampf von der Niedrigdruckdampfquelle (1) zu dem Trockner (3) zu liefern und somit das Trocknen der Papier-, Karton- oder Pulpebahn unter Verwendung des Dampfes von der Niedrigdruckdampfquelle (1) zu ermöglichen, und
    einem Dampfkühler (4) zum Kühlen des Dampfes, wobei der Dampfkühler (4) zwischen dem mechanischen Kompressor (2) und dem Trockner (3) angeordnet ist,
    dadurch gekennzeichnet, dass
    der Dampfkühler (4) mit der Hauptleitung (1a) an einem Ort stromabwärtig des Bypasses verbunden ist.
  2. Trocknervorrichtung gemäß Anspruch 1, die des Weiteren Folgendes aufweist:
    ein Ventil (11, 21, 22) zum Umgehen des mechanischen Kompressors.
  3. Trocknervorrichtung gemäß einem der Ansprüche 1 oder 2, die des Weiteren Folgendes aufweist:
    einen Elektromotor zum Antreiben des mechanischen Kompressors (2).
  4. Trocknervorrichtung gemäß einem der Ansprüche 1 bis 3, wobei der Trockner (3) ein Lufttrockner oder ein Zylindertrockner ist.
  5. Trocknervorrichtung gemäß einem der Ansprüche 1 bis 4, wobei
    in einer Dampfkühlerleitung, die sich von dem Dampfkühler (4) zu der Hauptleitung (1a) erstreckt, ein Dampfkühlerventil (41) angeordnet ist.
  6. Verfahren zum Trocknen von Papier-, Karton- oder Pulpebahnen mit den folgenden Schritten:
    Vorsehen von unter niedrigem Druck stehendem Dampf durch eine Niedrigdruckdampfquelle (1),
    Erhöhen des Drucks des unter niedrigem Druck stehenden Dampfes durch einen mechanischen Kompressor (2),
    Anwenden des Dampfes von dem mechanischen Kompressor (2) in einem Trockner (3) zum Trocknen der Papier-, Karton- oder Pulpebahn,
    Vorsehen einer Hauptleitung (1a), die sich von der Niedrigdruckdampfquelle (1) zu dem Trockner (3) erstreckt,
    Vorsehen eines Bypasses, der den mechanischen Kompressor (2) umgeht, um unter niedrigem Druck stehenden Dampf von der Niedrigdruckdampfquelle (1) zu dem Trockner (3) zu liefern und somit das Trocknen der Papier-, Karton- oder Pulpebahn unter Verwendung des Dampfes von der Niedrigdruckdampfquelle (1) zu ermöglichen, und
    Kühlen des Dampfes durch einen Dampfkühler (4) zwischen dem mechanischen Kompressor (2) und dem Trockner (3),
    gekennzeichnet durch den folgenden Schritt
    Verbinden des Dampfkühlers (4) mit der Hauptleitung (1a) an einem Ort stromabwärtig des Bypasses.
  7. Verfahren gemäß Anspruch 6, wobei
    der mechanische Kompressor (2) permanent betrieben wird, wenn ein höherer Dampfdruck fortlaufend benötigt wird, und
    der mechanische Kompressor (2) lediglich zu einem bestimmten Teil der Zeit betrieben wird, wenn höherer Dampfdruck lediglich gelegentlich benötigt wird.
EP20120161761 2012-03-28 2012-03-28 Dampftrocknungsvorrichtung und Verfahren Active EP2644771B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20120161761 EP2644771B1 (de) 2012-03-28 2012-03-28 Dampftrocknungsvorrichtung und Verfahren
CN2013201473268U CN203320337U (zh) 2012-03-28 2013-03-28 用于纸、纸板或纸浆幅材的蒸汽干燥设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120161761 EP2644771B1 (de) 2012-03-28 2012-03-28 Dampftrocknungsvorrichtung und Verfahren

Publications (2)

Publication Number Publication Date
EP2644771A1 EP2644771A1 (de) 2013-10-02
EP2644771B1 true EP2644771B1 (de) 2014-09-03

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Country Status (2)

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EP (1) EP2644771B1 (de)
CN (1) CN203320337U (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520355B (en) * 2013-11-19 2020-04-15 Spirax Sarco Ltd Steam compression apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5210958A (en) * 1991-07-15 1993-05-18 Mcgill University Paper web drying apparatus and process
SE517787C2 (sv) * 1999-10-08 2002-07-16 Stora Enso Ab Förfarande och anordning för ångtillförsel till torkparti i en pappersmaskin
WO2010096012A1 (en) * 2009-02-20 2010-08-26 Stora Enso Ab Process for increasing the drying capacity and a device for increasing the drying capacity

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EP2644771A1 (de) 2013-10-02
CN203320337U (zh) 2013-12-04

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