EP1595025A1 - Echangeur thermique a plasma - Google Patents

Echangeur thermique a plasma

Info

Publication number
EP1595025A1
EP1595025A1 EP04710849A EP04710849A EP1595025A1 EP 1595025 A1 EP1595025 A1 EP 1595025A1 EP 04710849 A EP04710849 A EP 04710849A EP 04710849 A EP04710849 A EP 04710849A EP 1595025 A1 EP1595025 A1 EP 1595025A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
plasma
exchanger according
coated
heat transfer
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.)
Withdrawn
Application number
EP04710849A
Other languages
German (de)
English (en)
Inventor
Ludwig Hellenthal
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.)
Walzen Irle GmbH
Original Assignee
Walzen Irle GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Walzen Irle GmbH filed Critical Walzen Irle GmbH
Publication of EP1595025A1 publication Critical patent/EP1595025A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F5/00—Elements specially adapted for movement
    • F28F5/02—Rotary drums or rollers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0246—Hard rolls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal

Definitions

  • the invention relates to a heat exchanger according to the preamble of claim 1.
  • Such heat exchangers are used for the production or finishing of web-like products in industry, predominantly in calenders.
  • the thermally applied surface coatings have the disadvantage of a relatively large porosity of the finished layer. Wear particles have the ability to penetrate these pores and the less hard matrix areas and then "wash them out”.
  • Surface-hardened forged steel rollers in addition to insufficient tempering resistance and the associated low hardness, also have an unfavorable residual stress distribution caused by surface-hardening. High tensile stresses in the area of the hardness zone negate the advantages of the good mechanical properties of forged steel.
  • New coating slips and feedstocks in paper production require increased chemical and mechanical corrosion resistance not only of the roll barrel but also of the entire roll surface which is connected to the environment and the web. Due to the enormous heat transfer capacities (> 80 kW / m), constantly increasing heat transfer temperatures, the contact surfaces exposed to the fluid heat transfer media are exposed to ever greater chemical / mechanical corrosion.
  • the invention has for its object to develop a generic heat exchanger so that he the above. Does not have disadvantages, in particular that surface hardnesses well in excess of 400-450 HV are achieved and that chemical / mechanical corrosion is minimized even with heat transfer rates> 80 kW / m.
  • the tempered forged steel rollers described above are plasma-coated at the desired locations.
  • plasma mating is used in the following as a collective term for the sub-terms plasma nitriding, plasma nitrocarburizing, plasma oxidizing, plasma carbonitriding and plasma carburizing. This takes place primarily in a vacuum chamber at a treatment pressure of 0.3 to 10 mbar.
  • the treatment temperature is between 400 - 600 ° C depending on the task.
  • Ammonia, nitrogen, methane and hydrogen are predominantly used as process gases.
  • Pressure, temperature, time and gas type form parameters when varying layers and desired surface hardness. Surface hardnesses of up to 1200 HV can be achieved on the desired surfaces, with a hardness depth of up to 1 mm being achieved.

Abstract

L'invention concerne un échangeur thermique à symétrie de rotation, rotatif, pouvant être tempéré, notamment destiné à l'unité de compression, de séchage ou de lissage d'une machine de fabrication de produits en bande, notamment de bandes de papier ou de plastique. Ledit échangeur peut de préférence être tempéré au moyen de fluides ou de caloporteurs vaporeux ou d'un chauffage éléctrique. L'invention vise à améliorer un tel échangeur thermique de manière à atteindre des duretés de surface nettement supérieures à 400-450 HV, et à réduire la corrosion chimique/mécanique même pour des puissances de transfert thermique > 80 KW/m. A cet effet, l'échangeur thermique selon l'invention est à plasma.
EP04710849A 2003-02-19 2004-02-13 Echangeur thermique a plasma Withdrawn EP1595025A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10307107 2003-02-19
DE10307107 2003-02-19
PCT/EP2004/001340 WO2004074571A1 (fr) 2003-02-19 2004-02-13 Echangeur thermique a plasma

Publications (1)

Publication Number Publication Date
EP1595025A1 true EP1595025A1 (fr) 2005-11-16

Family

ID=32891762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04710849A Withdrawn EP1595025A1 (fr) 2003-02-19 2004-02-13 Echangeur thermique a plasma

Country Status (5)

Country Link
US (1) US20060144563A1 (fr)
EP (1) EP1595025A1 (fr)
JP (1) JP2006518013A (fr)
CA (1) CA2516951A1 (fr)
WO (1) WO2004074571A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006003386A1 (de) * 2006-01-24 2007-07-26 Reichel, Walter, Dipl.-Ing. Vorrichtung und Verfahren zur Oberflächenbehandlung von Walzen in der Papierindustrie
JP5241455B2 (ja) * 2008-12-02 2013-07-17 新日鐵住金株式会社 浸炭窒化部材および浸炭窒化部材の製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI82094C (fi) * 1989-02-16 1997-09-09 Valmet Corp Anvaendning av en legering av ett metallpulver och en karbid eller nitrid innefattande belaeggningskomposition foer en i en pappersmaskin anvaendbar yankeecylinder
JPH05304872A (ja) * 1992-04-30 1993-11-19 Sanyo Electric Co Ltd 自動製麺機のミキサー取付構造
US5707705A (en) * 1993-09-08 1998-01-13 Tulip Memory Systems, Inc. Titanium or titanium-alloy substrate for magnetic-recording media
US5499936A (en) * 1995-01-12 1996-03-19 Outboard Marine Corporation Monolithic metallic drive shafts which are resistant to corrosion and wear
DE19525863A1 (de) * 1995-07-15 1997-01-16 Ae Goetze Gmbh Gleitringdichtung für die Laufwerke von Gleiskettenfahrzeugen
DE19730449A1 (de) * 1997-07-16 1999-01-21 Mosca G Maschf Spannvorrichtung für Umreifungsmaschinen
US6755566B2 (en) * 2001-02-15 2004-06-29 Konrad Damasko Clockwork
US7465362B2 (en) * 2002-05-08 2008-12-16 Btu International, Inc. Plasma-assisted nitrogen surface-treatment
US6966954B2 (en) * 2002-10-24 2005-11-22 General Electric Comany Spall propagation properties of case-hardened M50 and M50NiL bearings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004074571A1 *

Also Published As

Publication number Publication date
US20060144563A1 (en) 2006-07-06
JP2006518013A (ja) 2006-08-03
WO2004074571A1 (fr) 2004-09-02
CA2516951A1 (fr) 2004-09-02

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