EP2398960B1 - Process for increasing the drying capacity - Google Patents

Process for increasing the drying capacity Download PDF

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Publication number
EP2398960B1
EP2398960B1 EP10744029.9A EP10744029A EP2398960B1 EP 2398960 B1 EP2398960 B1 EP 2398960B1 EP 10744029 A EP10744029 A EP 10744029A EP 2398960 B1 EP2398960 B1 EP 2398960B1
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EP
European Patent Office
Prior art keywords
steam
pressure
drying
paper
increase
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.)
Not-in-force
Application number
EP10744029.9A
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German (de)
English (en)
French (fr)
Other versions
EP2398960A4 (en
EP2398960A1 (en
Inventor
Torsten Svenland
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.)
Stora Enso AB
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Stora Enso AB
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Publication date
Application filed by Stora Enso AB filed Critical Stora Enso AB
Priority to PL10744029T priority Critical patent/PL2398960T3/pl
Publication of EP2398960A1 publication Critical patent/EP2398960A1/en
Publication of EP2398960A4 publication Critical patent/EP2398960A4/en
Application granted granted Critical
Publication of EP2398960B1 publication Critical patent/EP2398960B1/en
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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

Definitions

  • the present invention relates to a method for increasing the drying capacity of a steam group in a section of a paper or board machine or pulp dryer. This method is characterised by low investment costs and high energy efficiency.
  • the fiber web is passed over a number of drying cylinders which are heated by means of steam.
  • the web is normally held against the drying cylinders by means of dryer fabrics.
  • the drying section is usually splitted into a number of drying groups, where each drying group is made up of a number of drying cylinders and rolls and normally at least one fabric.
  • Many PM and BM drying systems consist of more than one drying sections (for example pre- and after drying sections).
  • Another way of splitting the drying sections is to divide the drying cylinders into steam groups, in which each drying cylinder in a steam group and normally also all steam groups are supplied with steam from the same header pipe.
  • the drying groups may coincide with the steam groups.
  • Steam is supplied to the PM or BM from one or several main steam conduits under constant or some sliding pressure.
  • this steam which originates from a steam boiler, has passed through one or more turbines, which have converted some of the energy content of the steam into electric or mechanical power.
  • the steam produced by the boiler usually keeps a pressure of about 30-100 bar, but pressures of up to about 140 bar can be found.
  • This steam is called highpressure (HP) steam.
  • HP steam highpressure
  • a mill's steam system normally keeps one constant HP steam pressure level. However, there might be some mills with more than one HP steam pressure level in different sections of boilers and turbines. Higher pressure of HP steam normally means higher specific power production from the turbine as kWh/t steam.
  • steam has normally more than one exhaust, mainly to turbine end exhaust, also named back pressure steam exhaust, normally connected to low pressure (LP) steam net with a pressure range of about 2-6 bar.
  • back pressure steam exhaust normally connected to low pressure (LP) steam net with a pressure range of about 2-6 bar.
  • LP low pressure
  • MP medium pressure
  • Lower exhaust pressure means specific more power production from turbine as kWh/t steam. This is always valid for the back pressure steam net, normally LP steam, and also in most cases also valid for steam extraction to MP steam net.
  • One ton of LP steam from turbine creates nearly twice as much power compared to one ton of MP steam.
  • Typical values are about 180 respectively about 100 kWh power/ton of steam.
  • the capacity of steam extraction from turbine to MP net is often limited due to turbine construction and this means that at high consumption of MP steam there is often to some extend a direct reduction of HP- to MP steam net and this means of course further decreased power production.
  • a mill's own power production is of a very high economical importance.
  • the paper or board machines are very big steam consumers of the mill's total steam consumption, it is of outmost importance how the machine(s) uses LP/MP steam. It could very well mean that influence from one paper machine can create very big annual cost difference (cost differences of 5-10 MEuro is not unusual) when comparing bad and good steam solutions concerning a mills electricity costs.
  • LLP low low pressure fresh
  • Some steam consumers are then able to replace LP- with LLP-steam.
  • the supply of steam to LLP might be further turbine expansion of LP in a turbine or upgrading waste heat through process integration.
  • each drying cylinder is equipped with one or more discharge pipes (siphons or spiral scoops). After removal through the discharge pipes the discharge is separated in a separation vessel (normally one vessel for each big steam group) to steam and condensate.
  • the steam leaving the separation vessel is named blow through steam (bt-steam) and keeps, due to the pressure drop, a lower pressure compared to the steam pressure in the cylinders.
  • the steam pressure drop and the part of bt-steam will vary depending of equipment (stationary- or rotating siphones etc) and how they are operated. It is preferred to reuse the bt-steam that flows from the steam groups and replace expensive fresh steam in other positions (normally to other adjacent steam groups).
  • the receiver steam group keeps a lower steam pressure, the steam will flow by its own and this is called cascade coupling.
  • the supplied bt-steam is just a minor part and the main part is fresh steam.
  • the bt-steam pressure has to be increased (for example when returning the bt-steam to its own steam group). This is normally done by using a thermo compressor (TC), which normally uses MP-steam as motive steam. Usage of MP-steam (which replaces an equal amount of suction/ LP-steam) means a decrease of own valuable power production.
  • TC thermo compressor
  • the drying sections restricts the speed of which the web can be run. These situations may, for instance, occur when it is desirable to increase the speed of the machine or obtain higher grammage, if the press dryness are reduced or if the output dry solid content of the drying section is to be increased.
  • a limited drying capacity can be avoided, for instance, by lengthening the drying section or by increasing the saturation temperature of the supplied steam, which is usually performed by increasing the steam pressure.
  • drying section extension will determine the total stoppage time and often extend the stoppage time normally needed.
  • the drying system of a paper or board machine consists of at least one drying section but often two or more. Each drying section normally has 1-2 main steam groups. For one machine there is normally at least one big main group that contains several drying cylinders with high steam consumption and a high steam pressure increase demand when increasing the drying capacity or production.
  • the TC normally uses MP-steam as motive steam and the higher pressure increase needed, the more motive steam (MP) needs to be used and corresponding less suction steam (LP) is used.
  • MP motive steam
  • LP suction steam
  • suction LP-steam typically up to 0.5 bar
  • LP steam compared to full MP steam supply.
  • the TC discharge steam pressure the part of motive MP steam increases and at some pressure level the steam supplied from the TC consists in practice only of MP steam (only motive MP and no suction LP steam).Such operation conditions would create very big power production losses.
  • the TC technology has a low energy efficiency but it might be a total cost effective method if it is used for rather small pressure increases, short operating times and with selective steam use for the actual steam groups.
  • One object of the present invention is to define a solution to the above-described problems.
  • this object is achieved by a method for increasing the drying capacity of a steam group in a section of a paper or board machine or in a pulp dryer according to claim 1.
  • the steam group can be fed with steam having a pressure that exceeds the pressure of the main steam flow, which means that the drying capacity of the steam group is increased.
  • the method can preferably be used for increasing the drying capacity in the drying section of a paper or board machine. It can also be used to increase the capacity of a pulp dryer.
  • thermocompressor to increase the pressure before the steam is conducted to the mechanical vapour recompressor system. In this way it is possible to further increase the pressure and in some cases it is more economically beneficial to use both a thermocompressor and a mechanical vapour recompressor system.
  • more than one mechanical vapour recompressor systems can be used. This can be used when the needed increase of the pressure is very high and this still makes it possible to only use low pressure steam.
  • the pressure of the steam fed to the mechanical vapour recomressor system is between 2-6 bar and the pressure fed to the steam cylinders is between 3-12 bar.
  • Fig. 1 Show how steam with increased pressure is supplied to a steam group.
  • a main steam flow preferably low-pressure steam
  • a mechanical vapour recompressor system 10 where the pressure of the steam is increased.
  • a driving device such as an electric engine or a turbine (11) drives the mechanical vapour recompressor system (10).
  • Steam with increased pressure is fed from the mechanical vapour recompressor system (10) through conduit (2) to a steam group (12).
  • conduit (3) In some cases it might be necessary to cool the produced steam and "cooling" can be applied through conduit (3), in order to avoid undesired superheating of the steam. During production stops or paper breaks it might be necessary to recirculate the steam by conduit (4). In this way the production of high pressure steam will continue.
  • the steam can also be blown out or conducted to other groups or steam consumers through valve (5).
  • the steam conducted to the mechanical vapour recompressor system (10) has a steam pressure of about 2-6 bar and the steam that has passed the mechanical vapour recompressor system (10) and which is fed to the steam group (12) has a steam pressure of about 3-12 bar.
  • the drying cylinders are dimensioned to stand a pressure of up to about 7 bar and usually a pressure of at least about 0.5 bar is required to obtain satisfactory heating.
  • the maximum permissible pressure can, however, vary considerably depending on the type of paper or board machine and the age of the drying cylinders. In a board machine, the maximum permissible pressure can be 12 bar, in a new fine paper machine 5-7 bar and in older fine paper or newsprint machines as low as 2 bar.
  • the steam can be removed from the system through the safety valve (6) in order to make sure that the steam fed to the drying cylinders (12) does not exceed the maximum allowable steam cylinder pressure.
  • the steam fed to the mechanical vapour recompressor system is not recycled residual (bt-)steam but fresh steam normally from the turbine. In some applications a small share of recycled bt-steam may be used.
  • MVR Mechanical Vapour Recompression system
  • MVR mechanical vapour recompressor system
  • a MVR system keeps a high energy efficiency.
  • a one stage compressor is able to double the steam pressure if needed.
  • the benefit of a MVR system for the use of steam pressure increase of steam supplied to a steam group, compared to other solutions, is to achieve a higher pressure increase and thus making it possible to increase the net power production from the mill's turbine. The benefit will increase with larger pressure increases, higher steam flow to steam group and during longer operating times.
  • the MVR-unit could be down loaded to partial capacity in a very efficient way by controlling the driving speed.
  • MVR in serial coupling depending on the pressure needed.
  • a combination of one or more TC's and one or more MVR can be used. This might for example be suitable when the needed pressure increase is not that high or if maximum steam flow design capacity of the MVR is a bit low for short operating times and the use of small amounts of complementary steam flow are needed.
  • the steam flow demand is very high during a short amount of time a small amount of MP steam can alternatively be used, and thus a connection between the MP steam net and steam group after the MVR is necessary. For example, if the MVR capacity design is 60 t/h and there is a need for about 65 t/h during few annual hours it might be useful with a complementary TC or MP supply of 5 t/h.
  • a MVR system can also be used for improving the power production for the machines where there is no need for increasing the drying capacity.
  • many BM and kraft PM's use MP (about 12 bar steam net) steam for the large steam groups but most of the time they need much lower steam pressure, often about 6 bar. It would in these cases be much more efficient to use LP steam (about 3.5 bar) and compress to 6 bar and thus expand more steam through turbine to LP pressure level and increase power production.
  • the use of the MVR system according to the invention can thus be used in order to compress LP steam instead of using pressure reduced MP steam during production of a paper or board product.
  • a big fine grade PM (about 7m width and main grammage 80 g/m2) is planned a large increased production capacity from machine speeds about 1050 to 1 400 meter per minute without extending the drying sections.
  • the steam pressure of the pre- drying section main group will during most of the operating time be increased from about 3.5 bar (LP) to about 6.5 bar and steam flow will be increased from 50 t/h (LP) to 60 - 65 t/h for the main group.
  • LP- to MP steam it will cause a very big decrease for the mills power production for several reasons like, lower specific power output, direct reduction of HP- to MP net, much lower efficiency operating point for turbine etc which leads to an average decrease of at least 10 MW or on annual base 5-10 MEuro.
  • Typical investment costs for installation of steam pressure increasing device to supply a big main group could be estimated to about 1,5 respective 1 MEuro for MVR- respective TC-system. (Compared to a drying section extension at about 20 MEuro and a long shut down time for rebuild).
  • a MVR system can also be used in other applications, for example by recovering steam from TMP- and CTMP refiners.
  • a big part of all electrical power input to drive the refiners will be converted to heat that is possible to recover as steam in steam reformers.
  • This recovered steam often keeps a too low pressure to be supplied to the ordinary steam net (normally LP net) in the mill. So the steam has to be compressed and the common method is by TC but the MVR technology is a competitive alternative.
  • an efficient steam compression system such as a MVR, it is possible to recover the refiner's heat as steam to a bigger extent and also compress steam fractions with lower pressure to a useful level as LP or LLP steam net.
  • a MVR-system can also be used in the mills which desire even higher steam pressure for some of their steam consumers (for example drying/- production increase or energy improvements) which could not be achieved with full MP steam pressure.
  • Typical applications are hot circulation air dryers for coating paper drying or build in to a paper machine drying cylinder section, some drying cylinders/steam groups for some kraft PM's, Yankee drying cylinders and calendering.
  • MP steam could be compressed to desired level.
  • TC system with HP steam as motive steam
  • a MVR system may be able to compress MP steam from about 10-15 bar to about 20-25 bar or more if needed.
  • the MP steam should have passed the mills turbine.
  • oil heating such as calenders
  • Theoretical HP-steam with sufficient pressure/saturation temperature can be used, but in many applications it is a more complicated and less efficient method, since you often need to reduce the pressure of the HP-steam. Consequently, the best way to achieve high oil circulation temperatures is to use a MVR system.
  • HP steam pressure when needed by a MVR, for example from 35 bar out from steam boiler to 60 bar desired for calendering oil heating.
  • a mechanical vapour recompression system can also be designed to be fed with MP- or HP-steam for further pressure increase to a mills higher pressure demand steam groups or other steam consumers.

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EP10744029.9A 2009-02-20 2010-02-19 Process for increasing the drying capacity Not-in-force EP2398960B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10744029T PL2398960T3 (pl) 2009-02-20 2010-02-19 Sposób zwiększenia wydajności suszenia

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15418509P 2009-02-20 2009-02-20
PCT/SE2010/050192 WO2010096012A1 (en) 2009-02-20 2010-02-19 Process for increasing the drying capacity and a device for increasing the drying capacity

Publications (3)

Publication Number Publication Date
EP2398960A1 EP2398960A1 (en) 2011-12-28
EP2398960A4 EP2398960A4 (en) 2012-08-01
EP2398960B1 true EP2398960B1 (en) 2014-04-09

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EP10744029.9A Not-in-force EP2398960B1 (en) 2009-02-20 2010-02-19 Process for increasing the drying capacity

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EP (1) EP2398960B1 (pl)
PL (1) PL2398960T3 (pl)
WO (1) WO2010096012A1 (pl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2644771B1 (en) * 2012-03-28 2014-09-03 Valmet Technologies, Inc. Steam dryer device and method
SE2430033A1 (en) * 2024-01-29 2025-07-30 Valmet Oy Tissue paper drying system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001027388A1 (en) * 1999-10-08 2001-04-19 Stora Enso Ab Method and device for supplying steam to the drying section in a papermaking machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU81168A1 (fr) * 1979-04-19 1980-12-16 Laguilharre Sa Perfectionnement aux evaporateurs a recompression mecanique de vapeur
US4447964A (en) * 1981-11-23 1984-05-15 Gardner Thomas A Dryer drainage by recirculation with primary and secondary dryers
US4495312A (en) * 1982-03-16 1985-01-22 Sekisui Kagaku Kogyo Kabushiki Kaisha Resin composition suitable for use in medical devices
AT382176B (de) * 1984-02-10 1987-01-26 Andritz Ag Maschf Einrichtung an der trockenpartie von papiermaschinen
US5210958A (en) * 1991-07-15 1993-05-18 Mcgill University Paper web drying apparatus and process
DE102008041860A1 (de) * 2008-09-08 2010-03-11 Voith Patent Gmbh Heizsystem zur Behandlung einer Faserstoffbahn

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001027388A1 (en) * 1999-10-08 2001-04-19 Stora Enso Ab Method and device for supplying steam to the drying section in a papermaking machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VILLALOBOS J A ET AL: "Improvement of drying efficiency by steam recompression", PAPER TECHNOLOGY AND INDUSTRY, LONDON, vol. 21, no. 6, 1 July 1980 (1980-07-01), pages 197 - 201, XP001526093, ISSN: 0306-252X *

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Publication number Publication date
WO2010096012A1 (en) 2010-08-26
PL2398960T3 (pl) 2014-09-30
EP2398960A4 (en) 2012-08-01
EP2398960A1 (en) 2011-12-28

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