US3798785A - Device for drying continuous web material - Google Patents

Device for drying continuous web material Download PDF

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Publication number
US3798785A
US3798785A US00180001A US18000171A US3798785A US 3798785 A US3798785 A US 3798785A US 00180001 A US00180001 A US 00180001A US 18000171 A US18000171 A US 18000171A US 3798785 A US3798785 A US 3798785A
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Prior art keywords
steam
amplifier
boiler
enclosure
compressor
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Expired - Lifetime
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US00180001A
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English (en)
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D Chamouton
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • F26B23/005—Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/09—Various apparatus for drying textiles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates in general to the drying of continuous webs of products or materials and has specific reference to an improved installation for the continuous drying of webs of products or materials from which moisture is to be removed.
  • the improved apparatus according to this invention is characterized essentially in that the water contents of the moist product are rejected in the liquid state by resorting to a thermal cycle which, after having transferred at a predetermined temperature to said moist product the energy necessary for vaporizing the water contained therein, recovers this energy at a considerably lower temperature by condensing the steam thus formed.
  • This cycle involves only a very limited power expenditure in proportion to the heat energy necessary for vaporizing purposes only, according to the conventional means utilized in hitherto known drying plants.
  • the apparatus according to the present invention provides a regulation system whereby the product can be subjected to a continuous drying action'in an air-free vapour atmosphere at a pressure close to the atmospheric value, the residual moisture rate of the product being kept at a predetermined value, without any supply of external heat, notably in the form of vapour, except during the starting period of the apparatus operation.
  • the hitherto known processes can provide a comparable performance.
  • the apparatus of this invention is further characterized by an original feature in fact, in drying operations it is a frequent occurence that the dryness of the product, for instance a paper web or sheet, varies in a direction perpendicular to its direction of travel.
  • the vapour tension of the moist product varies as a function of its dryness now the continuous drying pure vapour atmosphere according to this invention makes this dryness uniform or regular both transversely and longitudinally of the sheet or web.
  • FIG. 1 is a diagrammatic illustration of a drying apparatus according to this invention, as applied to a textile or paper production plant, and
  • FIG. 2 is a block diagram illustrating the regulation means associated with the plant of FIG. 1.
  • the product to be dried in the form of a continuous web of textile or paper product 1, is caused to pass over a set of rotary cylinders 2 heated internally by means of steam supplied through a pipe line 3 (shown only in connection with one of such cylinders), this steam condensing in the cylinders while the condensation water is removed via another pipe line 4.
  • this section of the plant is well known in all drying plants utilizing rotary heating cylinders, the steam being generated by a boiler to which the condensation water is recycled while the steam extracted from the product proper is usually dissipated in the surrounding atmosphere.
  • this invention does not change the arrangement and mode of operation of these heating cylinders, it provides a completely different steam circuit arrangement.
  • the heating steam circuit is closed and operates as a heat pump. It comprises a compressor 5 driven from a steam turbine, a thermal engine or an electric motor (not shown) for delivering compressed, steam to the cylinders 2 via pipe lines 3, and a boiler 6 inserted in the closed circuit upstream of the compressor for vaporizing the condensation water from cylinders 2 after its passage through a pressurereducing device 7.
  • a vacuum pump 19 (or a water pump) is provided for eliminating the non-condensable products from cylinders 2.
  • the set of heating cylinders 2 is housed in a fluid-tight housing 8, provided however with a pair of slits 9 to permit the ingress and egress of the product to be dried.
  • An exhaust chimney l0 directs the steam generated by the heating of the moist product into the boiler 6 where it is condensed.
  • the condensation product is collected by a pipe 11.
  • a vacuum pump or water or steam pump 12 removes air and other non-condensable gases from the housing 8.
  • the air in-' take of this ejector is located at the output of the condenser section of boiler 6.
  • the paths of fluid from 7 to 5 and from 10 to 11 are separate and heat is transferred in a well known manner from the path 10-11 to the path 7-5.
  • the above-described plant operates as follows
  • the closed circuit comprising the compressor 5, boiler 6, pressure-reducing device 7 and heating cylinders 2 is similar to the closed circuit of a refrigerator. It discharges via pipe 3, at a temperature T steam utilized in this case for heating the rotary cylinders 2 and absorbs in the boiler 6 heat at a temperature T lower than T
  • the heat applied to the cylinders causes the water contained in the paper or textile web 1 to evaporate at a temperature T this steam is condensed in boiler 6 to provide the heat necessary for operating the refrigeration cycle.
  • the temperature T should lie within the range from T to T
  • the values of T and T are determined by the pressurereducing device 7 together with the compression rate.
  • the temperature T is very slightly higher than 100C and the pressure within the housing 8 is slightly above the atmospheric value.
  • the energy supplied by the compressor is such that the drying cylinders vaporize more water than the boiler condenses steam therefore, there is an excess of steam in the housing, one fraction of this excess steam condensing on the walls of the boiler, the other fraction escaping through the slits 9, thus precluding any ingress of air. Under these conditions, there is no air admission and a certain steam leak takes place.
  • the compressor supplies overheated steam it is advantageous to supply saturating steam to the drying cylinders therefore, water is tapped from the high-pressure circuit via pipe line 14, this water forced by pump 17 being re-injected either directly into compressor 5 or down-stream thereof through an atomiser.
  • the regulation system illustrated in FIG. 2 of the drawing is adapted to perform the following two functions 1. keeping the steam pressure in the housing 8 at a value very slightly greater than the surrounding atmospheric value 2. maintaining at a predetermined value the residual moisture rate of the product issuing from the drying plant.
  • this regulation system comprises two servo-action loops.
  • the pressure control loop comprises a temperature detector 25 (such as a resistance, thermocouple or any other means capable of giving an electrical measurement of the temperature) disposed within the housing 8 and inserted in a Wheatstone bridge.
  • a potentiometer 26 displays in said bridge'the control value corre-. sponding to a temperature very close to 100C.
  • the output signal of said bridge is the input signal of an amplifier 27' to which the return servo-signal is also fed.
  • This amplified signal actuates the control relays 28 of an electric servo-motor 29, for example an asynchronous three-phase motor.
  • a tachometric generator 30 measures the rotational speed of servo-motor 29 and the signal delivered by this generator is the servo-return signal fed to amplifier 27.
  • the servo-motor 29 controls either the rotational speed of the compressor driving motor or, as illustrated diagrammatically in FIG. 2, a variable-speed gearing 3] coupling the compressor 5 to a drivingmotor 32 revolving at a substantially constant speed, such as an asynchronous three-phase electric motor.
  • a substantially constant speed such as an asynchronous three-phase electric motor.
  • the servo-loop controlling the residual moisture rate is operatively connected to the pressure-reducing device it is, used for pre-setting the compression rate in the water closed-circuit. It comprises a moisture detector 33 inserted in a bridge, a potentiometer 34 of this bridge setting the rated value of the residual moisture content.
  • the output signal of the bridge is used for monitoring a modulator amplifier 35 delivering squarewave control signals having a time characteristic proportional to the measured discrepancy and a very low frequency in relation to the inherent frequency of the pressure control loop. These signals are adapted to control the opening or closing of control relays 36 of servo-motor 37 monitoring through a reduction gearing 38 the movement of the needle valve of pressurereducing device 7.
  • the modulator-amplifier 35 is adapted to deliver any other kinds of signals as may prove necessary and the servo-motors 29 and 37 may be controlled linearly, either electrically or pneumatically or hydraulically.
  • the only requirement to be met is that the time constant of the relative moisture rate control loop be at least five times greater than the time constant of the loop controlling the pressure in housing 8.
  • a control system for the continuous drying of wet products such as textiles or paper webs comprising drums for receiving said products therebetween, a steam compressor connected for supplying steam to one of said drums, a pressure reducing device in a condensate return circuit from said drum, a boiler in said circuit capable of vaporizing low pressure condensate and feeding said one drum through said compressor,
  • a control system capable of maintaining the vapor pressure in said enclosure at a level slightly higher than the atmospheric pressure and comprising a temperature probe in said enclosure, a Wheatstone bridge connected to said probe for receiving the output signal of said probe, an adjustable resistance in said bridge being fixed for a temperature slightly higher than 212F and of which the output is fed to an amplifier and after amplification controls the opening and closing of a control relays of a servomotor piloting the speed of a motor driving said compressor, and a tachometric generator fixed on a shaft of said servomotor and connected to said amplifier to add its feedback signal to the input signal of said amplifier.
  • a control system as claimed in claim 1, comprising a moisture detector positioned at the exit point of said products from said enclosure and connected to a Wheatstone bridge with the signal of said detector being the input of said bridge whose adjustable resistance is fixed at the desired moisture level and of which the output is fed to an amplifier and after amplification is fed to a control relay which controls a servomotor coupled with the pressure reducing device by a gearing having a large reduction ratio.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
US00180001A 1970-09-22 1971-09-13 Device for drying continuous web material Expired - Lifetime US3798785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7034228A FR2106708A5 (ja) 1970-09-22 1970-09-22

Publications (1)

Publication Number Publication Date
US3798785A true US3798785A (en) 1974-03-26

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Family Applications (1)

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US00180001A Expired - Lifetime US3798785A (en) 1970-09-22 1971-09-13 Device for drying continuous web material

Country Status (6)

Country Link
US (1) US3798785A (ja)
CA (1) CA977960A (ja)
DE (1) DE2147021A1 (ja)
FR (1) FR2106708A5 (ja)
GB (1) GB1354797A (ja)
SE (1) SE385031B (ja)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026035A (en) * 1976-02-06 1977-05-31 Dyer David F Dryer with low temperature heat recovery system
US4122611A (en) * 1976-02-19 1978-10-31 Air Industrie Apparatus for the continuous thermal treatment of a product moving through an enclosed space
US4290269A (en) * 1979-10-09 1981-09-22 Modo-Chemetics Ab Process for the efficient conversion of water-containing organic materials as fuels into energy
US4291539A (en) * 1978-02-10 1981-09-29 Monash University Power generation system
EP0079992A1 (en) * 1981-11-23 1983-06-01 Primatex Machinery Private Limited Apparatus for drying wet textile fabrics
EP0903437A3 (de) * 1997-09-20 2000-04-05 Voith Sulzer Papiertechnik Patent GmbH Verfahren zur Verringerung der Haftung einer feuchten Faserstoffbahn an einer routierenden Walze
US20050144802A1 (en) * 2002-09-10 2005-07-07 Voith Paper Patent Gmbh Equipment and method for producing and/or treating a fibrous web
CN102317541A (zh) * 2009-02-11 2012-01-11 Sca卫生用品公司 使用蒸汽回收干燥棉纸幅面的装置和方法
CN103748283A (zh) * 2011-06-20 2014-04-23 沃依特专利有限责任公司 制造材料幅面的机器的干燥部中回收热量的方法和系统
CN104729268A (zh) * 2015-04-14 2015-06-24 苏州欢颜电气有限公司 环保式膜烘干装置
CN104776703A (zh) * 2015-04-14 2015-07-15 苏州欢颜电气有限公司 快速拆装式膜烘干装置
US10662583B2 (en) * 2014-07-29 2020-05-26 Siemens Aktiengesellschaft Industrial plant, paper mill, control device, apparatus and method for drying drying-stock

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE418409B (sv) * 1977-05-16 1981-05-25 Alfa Laval Ab Forfarande for framstellning av sterkelse
FR2510736B1 (fr) * 1981-07-28 1986-07-18 Beghin Say Sa Procede de sechage par recompression de vapeur
FR2530929B1 (fr) * 1982-07-30 1985-06-07 Beghin Say Sa Procede de deshydratation de vegetaux humides
DE4412625C2 (de) * 1994-04-13 1999-05-06 Kleinewefers Gmbh Vorrichtung und Verfahren zum Behandeln einer Materialbahn
CN109440518B (zh) * 2018-09-29 2020-12-11 中国科学院理化技术研究所 一种基于mvr的造纸干燥系统
GB2622394A (en) * 2022-09-14 2024-03-20 James Cropper Plc A steam supply system and a method of supplying steam

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148720A (en) * 1936-03-27 1939-02-28 Armstrong Machine Works Moisture control system for paper drying machines and method
US2933826A (en) * 1957-01-02 1960-04-26 Beloit Iron Works Heat pump system for paper machine dryers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148720A (en) * 1936-03-27 1939-02-28 Armstrong Machine Works Moisture control system for paper drying machines and method
US2933826A (en) * 1957-01-02 1960-04-26 Beloit Iron Works Heat pump system for paper machine dryers

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026035A (en) * 1976-02-06 1977-05-31 Dyer David F Dryer with low temperature heat recovery system
US4122611A (en) * 1976-02-19 1978-10-31 Air Industrie Apparatus for the continuous thermal treatment of a product moving through an enclosed space
US4291539A (en) * 1978-02-10 1981-09-29 Monash University Power generation system
US4290269A (en) * 1979-10-09 1981-09-22 Modo-Chemetics Ab Process for the efficient conversion of water-containing organic materials as fuels into energy
EP0079992A1 (en) * 1981-11-23 1983-06-01 Primatex Machinery Private Limited Apparatus for drying wet textile fabrics
US6436239B2 (en) 1997-09-20 2002-08-20 Voith Sulzer Papiermaschinen Gmbh Method to reduce the adhesion of a damp fibrous material web to a rotating roll
EP0903437A3 (de) * 1997-09-20 2000-04-05 Voith Sulzer Papiertechnik Patent GmbH Verfahren zur Verringerung der Haftung einer feuchten Faserstoffbahn an einer routierenden Walze
US20050144802A1 (en) * 2002-09-10 2005-07-07 Voith Paper Patent Gmbh Equipment and method for producing and/or treating a fibrous web
US8261465B2 (en) * 2002-09-10 2012-09-11 Voith Paper Patent Gmbh Equipment and method for producing and/or treating a fibrous web
CN102317541A (zh) * 2009-02-11 2012-01-11 Sca卫生用品公司 使用蒸汽回收干燥棉纸幅面的装置和方法
CN102317541B (zh) * 2009-02-11 2014-12-03 Sca卫生用品公司 使用蒸汽回收干燥棉纸幅面的装置和方法
CN103748283A (zh) * 2011-06-20 2014-04-23 沃依特专利有限责任公司 制造材料幅面的机器的干燥部中回收热量的方法和系统
US10662583B2 (en) * 2014-07-29 2020-05-26 Siemens Aktiengesellschaft Industrial plant, paper mill, control device, apparatus and method for drying drying-stock
CN104729268A (zh) * 2015-04-14 2015-06-24 苏州欢颜电气有限公司 环保式膜烘干装置
CN104776703A (zh) * 2015-04-14 2015-07-15 苏州欢颜电气有限公司 快速拆装式膜烘干装置

Also Published As

Publication number Publication date
GB1354797A (en) 1974-06-05
FR2106708A5 (ja) 1972-05-05
DE2147021A1 (de) 1972-03-23
SE385031B (sv) 1976-05-31
CA977960A (en) 1975-11-18

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