EP0107200B1 - Arrangement for adjusting the amount of evacuated air, particularly in dryers - Google Patents

Arrangement for adjusting the amount of evacuated air, particularly in dryers Download PDF

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Publication number
EP0107200B1
EP0107200B1 EP83110580A EP83110580A EP0107200B1 EP 0107200 B1 EP0107200 B1 EP 0107200B1 EP 83110580 A EP83110580 A EP 83110580A EP 83110580 A EP83110580 A EP 83110580A EP 0107200 B1 EP0107200 B1 EP 0107200B1
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EP
European Patent Office
Prior art keywords
temperature
air
amount
arrangement according
difference
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Expired
Application number
EP83110580A
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German (de)
French (fr)
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EP0107200A2 (en
EP0107200A3 (en
Inventor
Dirk Dipl.-Ing. Bohm
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Individual
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Individual
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Priority to AT83110580T priority Critical patent/ATE32629T1/en
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Publication of EP0107200A3 publication Critical patent/EP0107200A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area

Definitions

  • the invention relates to an arrangement for automatically adapting the amount of exhaust air to the evaporation capacity under changing operating conditions in dryers operated by means of fresh air, recirculated air and exhaust air, in which a liquid is evaporated from a material to be dried.
  • the invention is based on the following consideration. The following applies to the amount of heat transferred to the web:
  • V L is a constant during the drying process, which is partly dependent on the fan speed and partly on the temperature. If you measure the temperature difference AT L with two temperature sensors and set the gain on a transmitter so that the associated exhaust air volume V A max is conveyed at ⁇ T Lmax , you only have to ensure that the exhaust air volume is always proportional to AT L adjusted.
  • the amount of exhaust air is set as a function of the difference between the temperature T 1 of the material to be dried and the temperature T 2 of the circulating air removed from the material.
  • the difference between the temperature T 1 and the temperature T 2 can be done directly or via a control gear by means of a transmitter for adjusting the speed of the drive motors of exhaust air fans.
  • a transmitter for adjusting the speed of the drive motors of exhaust air fans.
  • the transmitter has proven to be expedient to design the transmitter with adjustable gain. It is advantageous, but not limited, to adjust the rotational speed of the drive motors of the exhaust fans via the static frequency converters assigned to the motors and controlled by the measuring transducer.

Abstract

1. Arrangement for automatic adjustment of the amount of evacuated air to the evaporative power of dryers operating with inlet air, circulating air and outlet air, under changing working conditions, in which a liquid is evaporated out of a material to be dried, adjusting the amount of evacuated air dependent on the difference between the temperature T1 of the circulating air when carried towards the material to be dried and the temperature T2 of the circulating air when carried off again.

Description

Die Erfindung betrifft eine Anordnung zur automatischen Anpassung der Abluftmenge an die Verdampfungsleistung unter wechselnden Betriebsbedingungen bei mittels Frischlufs, Umluft und Abluft betriebenen Trocknern, in denen aus einem zu trocknenden Gut eine Flüssigkeit verdampft wird.The invention relates to an arrangement for automatically adapting the amount of exhaust air to the evaporation capacity under changing operating conditions in dryers operated by means of fresh air, recirculated air and exhaust air, in which a liquid is evaporated from a material to be dried.

Es ist bekannt, daß bei derartigen Trocknern mit vermehrter Frischluftzufuhr eine höhere Leistung erzielbar ist. Wegen der leistungsunabhängigen Kosten bei der Trocknung, wie Kapitaldienst, Lohnkosten usw., wirkt sich einerseits jede Leistungssteigerung bei einem Trockner günstig auf die Stückkosten aus. Andererseits fallen bei der vermehrten Zufuhr von Frischluft erhöhte Kosten für die Erwärmung dieser Luft an. Wird die Frischluftmenge erhöht, steigen diese Kosten entsprechend an. Die erzielte Mehrleistung wird aber immer geringer, so daß irgendwann eine weitere Erhöhung der Frischluftzufuhr nicht mehr lohnt.It is known that in such dryers with increased fresh air supply, a higher performance can be achieved. Because of the performance-independent costs for drying, such as debt service, labor costs, etc., on the one hand, any increase in performance with a dryer has a favorable effect on unit costs. On the other hand, the increased supply of fresh air leads to increased costs for heating this air. If the amount of fresh air is increased, these costs increase accordingly. The additional performance achieved is becoming less and less, so that at some point a further increase in the fresh air supply is no longer worthwhile.

Es gibt ein Stückkosten-Minimum, welches durch ein bestimmtes Verhältnis von Frischluft zu verdampftem Wasser gekennzeichnet ist, auszudrücken in Kg/Kg oder Abluftfeuchte in % oder als Abluft-Taupunkt. Um die optimale Abluftfeuchte auch bei wechselnder Trocknungsleistung, z. B. schmale - breite, leichte - schwere Ware aufrechterhalten zu können, sind Abluftfeuchte-Regelanlagen bekannt, deren allgemeine Verbreitung aber bei Textiltrocknern bisher an ihrein hohen Preis gescheitert sind und daran, daß sie durch die in der Abluft enthaltenen Flusen und öligen Nebel innerhalb kurzer Zeit unbrauchbar werden.There is a minimum unit cost, which is characterized by a certain ratio of fresh air to evaporated water, expressed in kg / kg or exhaust air humidity in% or as exhaust air dew point. To get the optimal exhaust air humidity even with changing drying performance, e.g. B. narrow - wide, light - heavy goods, exhaust air humidity control systems are known, but their general use in textile dryers has so far failed due to their high price and the fact that they are quickly removed by the fluff and oily mist contained in the exhaust air Time become unusable.

Durch die vorliegende Erfindung soll deshalb die Aufgabe gelöst werden, eine Anordnung zu schaffen, durch die mit einfachen Mitteln, insbesondere ohne schmutzempfindliche Feuchtefühler eine automatische Anpassung der Abluftmenge an die Verdampfungsleistung eines Trockners bei wechselnden Betriebsbedingungen ermöglicht wird.The object of the present invention is therefore to achieve an arrangement by means of which simple means, in particular without dirt-sensitive moisture sensors, make it possible to automatically adapt the amount of exhaust air to the evaporation capacity of a dryer under changing operating conditions.

Zwar wurde schon eine Anordnung zur Regelung der Abluftmenge bei Trocknungs- und Fixieranlagen, insbes. für breitgeführte Textilbahnen oder dergl. vorgeschlagen, bei der an den Ein- und Austrittsschlitzen für die Warenbahn zum Behandlungsraum Temperaturfühler für das Luftgleichgewicht und im Behandlungsraum Dampfgehaltsmesser angeordnet sind, die mit Regeleinrichtungen für die Abluft und/oder die Frischluft verbunden sind (DE-A-2 545 440). Diese Anordnung weist jedoch den Nachteil auf, daß die Temperaturen am Eintritt und Austritt der Warenbahn in das und aus dem Trocknergehäuse für die Regelung herangezogen werden. Diese Temperaturen stellen aber undefinierte Mischwerte aus Temperaturen aus der Umgebung des Trockners und irgendwo im Trocknergehäuse dar und ihre Differenzen lassen sich überhaupt nicht für definierte Regelungsaufgaben verwenden. Im übrigen ist diese Anordnung, die noch einen zusätzlichen Dampfgehaltsmesser mit Regeleinrichtungen für die Abluft und/oder die Frischluft vorsieht, sehr aufwendig.An arrangement for regulating the amount of exhaust air in drying and fixing systems, in particular for broadly guided textile webs or the like, has already been proposed, in which temperature sensors for the air balance and steam content meters in the treatment room are arranged at the inlet and outlet slots for the web to the treatment room are connected to control devices for the exhaust air and / or the fresh air (DE-A-2 545 440). However, this arrangement has the disadvantage that the temperatures at the entry and exit of the web into and out of the dryer housing are used for the control. However, these temperatures represent undefined mixed values from temperatures in the vicinity of the dryer and somewhere in the dryer housing, and their differences cannot be used at all for defined control tasks. Otherwise, this arrangement, which also provides an additional steam content meter with control devices for the exhaust air and / or the fresh air, is very complex.

Der Erfindung liegt folgende Überlegung zu Grunde. Für die an die Warenbahn übertragene Wärmemenge gilt:

Figure imgb0001
The invention is based on the following consideration. The following applies to the amount of heat transferred to the web:
Figure imgb0001

Darin sind:

Figure imgb0002
In it are:
Figure imgb0002

Dann ist:

Figure imgb0003
worin VL
Figure imgb0004
 während des Trocknungsprozesses eine Konstante ist, die teils lüfterdrehzahl-, teils temperaturabhängig ist. Mißt man also die Temperaturdifferenz ATL mit zwei Temperaturfühlern und stellt man an einem Meßumformer die Verstärkung so ein, daß bei ΔTLmax die dazugehörige Abluftmenge V Amax gefördert wird, braucht man nur noch dafür zu sorgen, daß die Abluftmenge sich immer proportional zu ATL verstellt.Then:
Figure imgb0003
 where V L
Figure imgb0004
 is a constant during the drying process, which is partly dependent on the fan speed and partly on the temperature. If you measure the temperature difference AT L with two temperature sensors and set the gain on a transmitter so that the associated exhaust air volume V A max is conveyed at ΔT Lmax , you only have to ensure that the exhaust air volume is always proportional to AT L adjusted.

Zur Lösung der gestellten Aufgabe wird daher eine Anordnung vorgeschlagen, bei der die Einstellung der Abluftmenge in Abhängigkeit von der Differenz zwischen der Temperatur T1 der dem zu trocknenden Gut zugeführten und der Temperatur T2 der von dem Gut abgeführten Umluft erfolgt. Dabei kann die Differenz zwischen der Temperatur T1 und der Temperatur T2 mittels eines Meßumformers für die Verstellung der Drehzahl der Antriebsmotore von Abluftventilatoren direkt oder auch über Regelgetriebe erfolgen. Es liegt auch im Rahmen der Erfindung, daß statt der Drehzahlverstellung eine Verstellung der Leitschaufeln oder einer Regeldüse an Abluftventilatoren oder auch daß eine Verstellung einer Drosseleinrichtung, beispielsweise einer Drosselklappe, in der Abluftleitung verwendet wird.To achieve the object, an arrangement is therefore proposed in which the amount of exhaust air is set as a function of the difference between the temperature T 1 of the material to be dried and the temperature T 2 of the circulating air removed from the material. The difference between the temperature T 1 and the temperature T 2 can be done directly or via a control gear by means of a transmitter for adjusting the speed of the drive motors of exhaust air fans. It is also within the scope of the invention that instead of the speed adjustment, an adjustment of the guide vanes or a control nozzle on exhaust air fans or that an adjustment of a throttle device, for example a throttle valve, is used in the exhaust air line.

Es hat sich als zweckmäßig erwissen, den Meßumformer mit einstellbarer Verstärkung auszuführen. Vorteilhaft, aber nicht darauf beschränkt ist es, die Verstellung der Drehzahl der Antriebsmotore der Abluftventilatoren über den Motoren zugeordnete vom Meßumformer gesteuerte statische Frequenzumformer vorzunehmen.It has proven to be expedient to design the transmitter with adjustable gain. It is advantageous, but not limited, to adjust the rotational speed of the drive motors of the exhaust fans via the static frequency converters assigned to the motors and controlled by the measuring transducer.

Claims (6)

1. Arrangement for autamatic adjustment of the amount of evacuated air to the evaporative power of dryers operating with inlet air, circulating air and outlet air, under changing working conditions, in which a liquid is evaporated out of a material to be dried, adjusting the amount of evacuated air dependent on the difference between the temperature T, of the circulating air when carried towards the material to be dried and the temperature T2 of the circulating air when carried off again.
2. Arrangement according to claim 1, werein the difference between temperature T, and temperature T2 is used by a measurement conventer to adjust the speed of the motors driving the exhaust fans.
3. Arrangement according to claim 1, wherein the difference between temperature T, and temperature T2 is used by a measurement converter to adjust the guiding vane or a regulating taper nozzle in exhaust fans.
4. Arrangement according to claim 1, wherein the difference between temperature T, and temperature T2 is used by a measurement converter to adjust a throttle device in the exhaust duct.
5. Arrangement according to one of the claims 2 to 4, using a measurement converter with adjustable amplification.
6. Arrangement according to claim 2 and 5, wherein the rotation speed of the motors driving the exhaust fans is adjusted by frequency changers belonging to the motors and being controlled by the measurement converter.
EP83110580A 1982-10-23 1983-10-22 Arrangement for adjusting the amount of evacuated air, particularly in dryers Expired EP0107200B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110580T ATE32629T1 (en) 1982-10-23 1983-10-22 ARRANGEMENT FOR ADJUSTING THE EXHAUST AIR QUANTITY ESPECIALLY FOR DRYERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823239250 DE3239250A1 (en) 1982-10-23 1982-10-23 ARRANGEMENT FOR ADJUSTING THE EXHAUST AIR QUANTITY. FOR DRYERS
DE3239250 1982-10-23

Publications (3)

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EP0107200A2 EP0107200A2 (en) 1984-05-02
EP0107200A3 EP0107200A3 (en) 1984-11-21
EP0107200B1 true EP0107200B1 (en) 1988-02-24

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EP83110580A Expired EP0107200B1 (en) 1982-10-23 1983-10-22 Arrangement for adjusting the amount of evacuated air, particularly in dryers

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AT (1) ATE32629T1 (en)
DE (1) DE3239250A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4325915A1 (en) * 1993-08-02 1995-02-09 Fleissner Maschf Gmbh Co Method for measuring humidity of a material web on a continuous drier and device for carrying out the method
AT2342U1 (en) * 1996-10-30 1998-08-25 Muehlboeck Kurt METHOD AND DEVICE FOR DRYING STACKED WOOD
DE19844692A1 (en) * 1998-09-29 2000-03-30 Brueckner Apparatebau Gmbh Device for the heat treatment of a web

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE368740B (en) * 1966-08-22 1974-07-15 Svenska Flaektfabriken Ab
GB1254171A (en) * 1969-01-07 1971-11-17 Litovsky Nii Mekh I Elektrofik Improvements in and relating to processing arrangements
JPS51143743A (en) * 1975-06-06 1976-12-10 Tsudakoma Ind Co Ltd Temperature control device for running thread dryer
DE2545440A1 (en) * 1975-10-10 1977-04-21 Artos Meier Windhorst Kg EXHAUST AIR VOLUME CONTROL IN DRYING AND FIXING SYSTEMS
US4397101A (en) * 1981-09-10 1983-08-09 General Electric Company Automatic dryer control

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Publication number Publication date
ATE32629T1 (en) 1988-03-15
EP0107200A2 (en) 1984-05-02
DE3239250A1 (en) 1984-04-26
EP0107200A3 (en) 1984-11-21

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