EP1910614A1 - Dunsthaube für eine papier- und/oder kartonmaschine - Google Patents
Dunsthaube für eine papier- und/oder kartonmaschineInfo
- Publication number
- EP1910614A1 EP1910614A1 EP06776046A EP06776046A EP1910614A1 EP 1910614 A1 EP1910614 A1 EP 1910614A1 EP 06776046 A EP06776046 A EP 06776046A EP 06776046 A EP06776046 A EP 06776046A EP 1910614 A1 EP1910614 A1 EP 1910614A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- condensation
- hood according
- dew point
- hood
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Definitions
- the invention relates to a hood for a paper and / or board machine.
- Paper or board machines have dryer sections, in which the wet paper or board web is dried by supplying convection heat or radiant heat usually by means of a cylinder drying. Efficient air systems are used to increase the process reliability and to optimally support the drying process to dissipate the high moisture or moisture content of the air, which can sometimes exceed 200 g per kg of dry air.
- a fume hood is placed over the dryer section of the paper or board machine, thereby enclosing this area. Via the extractor hood and an associated ventilation system, the moist air is removed and continuously replaced by newly supplied drier air.
- the hood parts are made of aluminum or stainless steel and are bolted to a stable, galvanized steel construction with a sealing system and insulated with dimensionally stable mineral wool.
- a leader's side lift gates with window band are provided.
- a dew point control and also heat recovery from the hood exhaust air can be provided.
- the energy consumption or primary heat consumption of the dryer section of the paper machine is important, which is lower with higher moisture content of the exhaust air.
- the problem of precipitation or condensation of water vapor on the inside of the housing of the hood increasingly important, especially then occurs when the temperature at the inner surface of the housing is lower than the dew point or the condensation temperature of the air with the respective moisture content.
- This condensation problem is very disadvantageous and, especially due to drops of water falling on the paper or board web, leads to damage or tearing of the paper or board web and thus to considerable failures. Furthermore, the condensation also leads to corrosion on the hood.
- the temperature in the drying section is typically about 100 ° C to 120 0 C. Due to the comparatively high temperatures in the interior space of the extractor hood are at least currently metals such as aluminum or stainless steel used on the inner surface of the cap body and no plastics or other heat-insulating materials.
- the moisture content of the exhaust air depends on the dew point of the air. For example, at a dew point of 60 0 C, a moisture content of 160 g / kg of dry air can be dissipated at a dew point of 72 0 C, a moisture content of 400 g / kg dry air. In a modern paper machine typically 1 million m 3 / h of exhaust air can be discharged through the hood and about 100,000 kg of water / h.
- DE 33 36 998 C2 also prevents condensation when the humidity of the exhaust air of the housing in sizes up to 200g / kg dry air lie.
- condensation at high moisture content of 200 g / kg dry air can not be avoided by increasing the thickness of the housing wall insulation and this is due to high local humidities or lower surface temperatures, which are thermal bridges or leaking Jobs occur, especially on doors and windows of the housing. Elimination of thermal bridges and loss spots would require such an expensive solution that this could not be done in practice.
- a heat insulating wall of the housing of the hood is provided with an approximately 1 mm thick aluminum sheet on both sides and inside a thermal insulation of 100 mm mineral wool. This interconnected structure has a thermal resistance of 0.833 m 2 ° C / Watt, including thermal bridges.
- DE 39 25 595 A 1 discloses a method and a device for measuring the dew point of gases, in particular the exhaust gas of a drying hood of a paper machine. The process gas is cooled down to the dew point by means of a cold gas and then the dew point is determined by light scattered by the resulting mist. Further, in DE 39 25 595 ⁇ 1 for measuring the dew point as the prior art so-called "cooling mirror" detectors that optically measure a precipitating moisture on a mirror polished level or dew point sensors based on the change in capacitance or resistance described as well as indirect measurements of the dew point by absorption in UV or IR spectra or microwaves or even a method using acoustic emissions.
- a method for reducing the energy consumption in a closed drying plant of a paper machine by dew point control is disclosed. Regardless of different outside air conditions and a variety program traveled on the paper machine, a system-specific optimal exhaust air state with highest possible dew point is achieved by regulating the carrier air quantity, whereby the temperature of the introduced air is kept constant and the carrier air quantity for the water vapor transport by reducing the Supply and exhaust air quantity is reduced.
- An exhaust air humidity sensor which is arranged in the exhaust air duct between an outlet of the extractor hood and a variable speed exhaust fan, the absolute humidity of the hood air is measured and by comparison with an exhaust air humidity setpoint, the exhaust air moisture is controlled to the setpoint by changing the exhaust air.
- the invention is based on the object of specifying a vapor hood for a paper and / or board machine, in which the problem of the Kon- tion is at least partially reduced and / or at which the operating dew point can be increased.
- the invention is based on the idea of providing on the inner surface of the housing of the vapor hood a condensation sensor arrangement or a condensation sensor system with which the inner surface of the vapor hood is monitored for possible or imminent formation of condensation.
- a droplet formation and thus a possible negative influence on the drying process is thus sensory anticipated or detected and an incipient condensation can be detected early and process technology prevented.
- the operation of the hood is safer and more controlled and the hood exhaust air volumes and the process air supply can be optimized.
- the (theoretical) operating dew point of the extractor hood of the paper or board machine can be increased and existing system reserves can be reduced to a safe minimum.
- the condensation sensors are preferably arranged at critical points or partial areas of the hood inner surface where condensation is most likely or most likely to occur.
- the hood roof or the area of the hood housing lying above the dryer section of the paper machine and / or the recess Running area of the paper and / or board machine in the hood and / or the outlet area of the paper and / or board machine in the hood provided with condensation sensors.
- the condensation sensors can be subdivided or spaced apart into individual sections or arrangements, in particular in the form of grids or other patterns.
- condensation sensor electrical condensation sensors are preferably used, which detect a change in electrical capacitance or electrical resistance between electrical conductors due to a change in the humidity of the intervening air or an at least partial replacement of the intervening air as a medium by a condensed condensate and as a measure of a looming or already occurred condensate formation.
- film sensors made of a carrier material (substrate) with mounted conductor tracks, which are arranged in pairs, are used as condensation sensors.
- An evaluation device is used to measure the change in an electrical voltage or an electric current between or in the conductor tracks or the conductivity or capacitance as a sensor signal.
- the evaluation of the sensor signals of the condensation sensors is scalable or can be carried out with different measuring ranges or measuring sensitivities, whereby or by which an assignment to different predetermined droplet sizes of the condensate, which is reflected in particular between the printed conductors, can take place.
- condensation sensors may also be provided, for example the dew point sensors described in DE 39 25 595 A1.
- the measurement signals or measurement data of the condensation sensors become individual for each condensation sensor during operation of the extractor hood or for groups of condensation sensors, in particular in the individual sections, continuously monitored or evaluated and can in particular be visualized, for example, displayed on a display in the form of numerical values or graphically, and / or archived or stored.
- the sensor signals or sensor values can also be further processed by means of an evaluation unit, in particular a computer, and the evaluations are made available, for example, via an interface, in particular a bus interface, to a higher-order process control system.
- a known dew point control is cascaded with a dew point sensor in the total exhaust air or in the exhaust duct of the hood via a setpoint shift.
- the control system is set or leveled, with preferably low safety margins are adjustable.
- the dew point is thus driven close to the point detection or the limit values of the condensation sensors. If the condensation on the condensation sensors or the droplet size or the droplet formation or number of droplets increases during operation, the reference variable of the dew point control is reduced again until an uncritical operating temperature is reached again. condition, ie the condensation detected by the condensation sensors again falls below the maximum permissible level.
- temperature sensors may also be provided at the subregions in which condensation sensors are arranged in order to measure the local temperature and, if appropriate, to obtain information about thermodynamic variables such as the dew point from the signals or data of the temperature sensors and the condensation sensors. In this way, a temperature compensation of the sensor signals of the condensation sensors or their scaling can be carried out via the temperature measured values or measuring signals.
- the extractor hood is subdivided into individual zones, for example three zones in the direction of paper or board web conveying, and the described condensation monitoring by means of the condensation sensors and preferably also the control of the dew point depending on this condensation monitoring are separated for each of the Zones performed.
- the efficiency can be specifically optimized for each of these zones depending on the respective moisture load in the respective zone.
- the air flow distribution in the interior or the zones of the extractor hood can be adjusted by targeted control of the air volumes of individual air supply ducts and / or Heilabsaugkanäle depending on the condensation onsüberwachung.
Landscapes
- Paper (AREA)
- Drying Of Solid Materials (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Cartons (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005029602A DE102005029602A1 (de) | 2005-06-23 | 2005-06-23 | Dunsthaube für Papier- und/oder Kartonmaschine |
| PCT/EP2006/005539 WO2006136298A1 (de) | 2005-06-23 | 2006-06-09 | Dunsthaube für eine papier- und/oder kartonmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1910614A1 true EP1910614A1 (de) | 2008-04-16 |
| EP1910614B1 EP1910614B1 (de) | 2009-12-30 |
Family
ID=37307099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06776046A Not-in-force EP1910614B1 (de) | 2005-06-23 | 2006-06-09 | Dunsthaube für eine papier- und/oder kartonmaschine |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20080155851A1 (de) |
| EP (1) | EP1910614B1 (de) |
| CN (1) | CN101258286B (de) |
| AT (1) | ATE453752T1 (de) |
| BR (1) | BRPI0613331B1 (de) |
| DE (2) | DE102005029602A1 (de) |
| ES (1) | ES2338156T3 (de) |
| WO (1) | WO2006136298A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009000753A1 (de) * | 2009-02-11 | 2010-08-12 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Trocknung einer Faserstoffbahn |
| DE102009053022A1 (de) | 2009-07-29 | 2011-05-19 | Curtius, Fritz | Vorrichtung zur Effizienzdiagnose auf der Basis von Dampf, H2O in lufttechnischen Anlagen |
| DE102009042554A1 (de) | 2009-09-22 | 2011-03-24 | Fritz Curtius | Prüfmittel zur Diagnose von konvektiver Verdampfung von Feuchte, H20 in Trocknern |
| FI121967B (fi) * | 2009-11-19 | 2011-06-30 | Metso Paper Inc | KUITURAINAKONEEN KUIVATUSOSAN HöYRY- JA LAUHDEJARJESTELMA |
| CN104215059A (zh) * | 2014-09-05 | 2014-12-17 | 广西壮族自治区特种设备监督检验院 | 一种烘缸经济器 |
| CN109114949B (zh) * | 2018-08-23 | 2023-08-15 | 盐城名杰纸品包装有限公司 | 一种纸制品加工装置 |
| DE112021008095T5 (de) * | 2021-09-17 | 2024-07-04 | LG Electronics Inc. | Elektronische Vorrichtung einschließlich Taukondensationssensor |
| NL2029388B1 (en) * | 2021-10-12 | 2023-05-09 | Tummers Beheer B V | A system and method for discharging evaporated product moisture from a drum dryer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3208158A (en) * | 1963-04-09 | 1965-09-28 | Hupp Corp | Dryers |
| US3696360A (en) * | 1971-06-16 | 1972-10-03 | Vapor Corp | Impending condensation alarm |
| GB1589073A (en) * | 1977-04-05 | 1981-05-07 | Greenbank Cast Basalt Eng Co Ltd | Hoods for the cylinder drying section of paper making machines and other cylinder drying machines |
| US4413427A (en) * | 1981-07-29 | 1983-11-08 | Aer Corporation | Fuel control system for dryer |
| MX161894A (es) * | 1986-01-28 | 1991-02-28 | Beloit Corp | Mejoras en aparato de control de presion diferencial para secador |
| DE19742787A1 (de) * | 1997-09-27 | 1999-04-01 | Voith Sulzer Papiertech Patent | Haube |
| US6104987A (en) * | 1997-10-03 | 2000-08-15 | The Nash Engineering Company | System for monitoring dryer drum temperatures |
| CN2400486Y (zh) * | 1999-08-28 | 2000-10-11 | 山东省诸城市造纸机械厂 | 烘缸罩 |
-
2005
- 2005-06-23 DE DE102005029602A patent/DE102005029602A1/de not_active Withdrawn
-
2006
- 2006-06-09 EP EP06776046A patent/EP1910614B1/de not_active Not-in-force
- 2006-06-09 CN CN2006800225901A patent/CN101258286B/zh not_active Expired - Fee Related
- 2006-06-09 ES ES06776046T patent/ES2338156T3/es active Active
- 2006-06-09 BR BRPI0613331A patent/BRPI0613331B1/pt active IP Right Grant
- 2006-06-09 DE DE502006005794T patent/DE502006005794D1/de active Active
- 2006-06-09 WO PCT/EP2006/005539 patent/WO2006136298A1/de not_active Ceased
- 2006-06-09 AT AT06776046T patent/ATE453752T1/de active
-
2007
- 2007-12-21 US US11/962,575 patent/US20080155851A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006136298A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005029602A1 (de) | 2007-01-04 |
| US20080155851A1 (en) | 2008-07-03 |
| BRPI0613331B1 (pt) | 2016-08-30 |
| DE502006005794D1 (de) | 2010-02-11 |
| ES2338156T3 (es) | 2010-05-04 |
| WO2006136298A1 (de) | 2006-12-28 |
| BRPI0613331A2 (pt) | 2011-01-04 |
| EP1910614B1 (de) | 2009-12-30 |
| ATE453752T1 (de) | 2010-01-15 |
| CN101258286B (zh) | 2012-08-29 |
| CN101258286A (zh) | 2008-09-03 |
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