WO1996005351A1 - Dispositif et procede de sechage de textiles apres nettoyage aux solvants organiques - Google Patents

Dispositif et procede de sechage de textiles apres nettoyage aux solvants organiques Download PDF

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Publication number
WO1996005351A1
WO1996005351A1 PCT/EP1995/002988 EP9502988W WO9605351A1 WO 1996005351 A1 WO1996005351 A1 WO 1996005351A1 EP 9502988 W EP9502988 W EP 9502988W WO 9605351 A1 WO9605351 A1 WO 9605351A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
solvent
condensation
drying
textiles
Prior art date
Application number
PCT/EP1995/002988
Other languages
German (de)
English (en)
Inventor
Walter Baumann
Original Assignee
Walter Baumann
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 Walter Baumann filed Critical Walter Baumann
Publication of WO1996005351A1 publication Critical patent/WO1996005351A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F43/00—Dry-cleaning apparatus or methods using volatile solvents
    • D06F43/08—Associated apparatus for handling and recovering the solvents
    • D06F43/086—Recovering the solvent from the drying air current

Definitions

  • the present invention relates to an apparatus and a method for cleaning textiles with organic solvents with an air circuit for drying the cleaned textiles and for evaporating and condensing the solvent remaining in them, the air circuit essentially being a blower for maintaining the air flow, a condensation section for Condensing out the solvent and at least one heating device for heating the air to the drying temperature.
  • Air which is heated from outside to the desired drying temperature by external heat using a heat exchanger, enters the treatment drum, which contains the spin-dry cleaned textile goods.
  • the solvent evaporates in the drum and is vaporized out of the drum with the air.
  • the dry air then flows through a heat exchanger, which is kept at a temperature with cooling water or a chiller at which a large part of the contained vapor Solvent is condensed.
  • the condensate is returned to the machine's solvent tank.
  • the air cooled in this way is reheated via a second heat exchanger, which is often the refrigerant condenser of a heat pump, with recovery of the heat removed in the previous cooler.
  • the air then flows through the air heater mentioned at the beginning, which is used to heat it up to the drying temperature, and the cycle begins again in the treatment drum.
  • a blower for the dry air is arranged in the distance between the drum outlet and drum re-entry.
  • the aforementioned system requires energy for driving the refrigeration compressor, i.e. the energy for operating the heat pump, and the heating energy for the air reheater, which is necessary for reaching the final drying temperature.
  • the circulating dry air must perform two tasks in the treatment drum; namely the transport of the energy necessary to evaporate the solvent in the drum and now heat the textiles there to the drying temperature.
  • the air has to transport the solvent vapor from the drum into the cooler, in which the solvent is recondensed.
  • the evaporation rate in the drum is essentially determined by the time-dependent transport processes of the solvent through the porous textile material.
  • the object of the present invention is therefore to provide an apparatus and a method for cleaning textiles with organic solvents according to the preamble of claims 1 and 6, in which the energy consumption for the refrigeration cycle in the recondensation of the solvent is reduced compared to the prior art is.
  • the good ventilation of the textile material with the dry air in the drum must be maintained in order to ensure that the evaporated solvent is removed as quickly as possible.
  • the energy supply which depends on the temperature of the drying air and its quantity, must be maintained in order to achieve short drying times.
  • the amount of condensed solvent from the air stream must also be retained, otherwise the drying time will be extended.
  • the entry temperature of the dry air into the drum should be maintained compared to the prior art. On the one hand, this temperature should be as high as possible to enable a high steam load of the dry air, on the other hand, the temperature resistance of the textile material must be taken into account.
  • FIG. 1 shows a block diagram of a drying cycle according to the invention.
  • the drying system consists of the treatment drum 1, a lint filter for separating entrained fluff 2, the blower for maintaining the air circuit 3, an adjustable throttle valve 4, the cooling system arranged in the bypass for condensing out the solvent 5, the heater for reheating the dry air to the drying temperature 6 and a shut-off valve 7.
  • a partial flow blower 8 can be installed in order to be able to better regulate the partial air flow L2 via the condensation path 5.
  • the condensation section 5 can consist of a cooler, but also of the cold and warm side of a heat pump. The condensed solvent emerges at 9 and is returned to the solvent tank.
  • the goods in the treatment drum 1 still have the cleaning temperature of approximately 30 ° C.
  • the air from the drum 1 is returned to the drum via the fluff filter 2, the blower 3, the opened valve 4 and the heater 6.
  • This closed circuit in which the cooling section for condensing the solvent is bypassed, leads to an energy-saving and rapid heating of the drum contents to the desired drying temperature.
  • the throttle point 10 is opened and the throttle point 4 is closed to such an extent that a portion L 1 of the dry air after the fan 3 goes directly into the heater 6 and from there back to the drum.
  • a portion L2 of the amount of air is passed through the condensation section 5 and enters the main air stream again before the heater 6 with the valve 7 closed.
  • the concentration is regulated via the throttle valve 4 so that the entire evaporated solvent in the drum 1 can be removed with a partial air flow L1 of about 20% to about 80% of the total amount of air circulating through the condensation path.
  • the portion L1 is advantageously about 2/3 and the portion L2 is about 1/3.
  • Drum is present.
  • the partial flow L2 via the condensation path 5 re-enters the main flow largely without solvent.
  • the concentration at the heater 6 and thus at the entrance to the drum 1 can be regulated.
  • the entry concentration into the drum 1 is clearly below the equilibrium concentration that belongs to the drum temperature, so the solvent concentration in the dry air circuit can be controlled without noticeably influencing the drying circuit.
  • a concentration of, for example, 45% of the equilibrium concentration is achieved in the arrangement according to the invention if the partial air quantity L2 passed through the condensation path 5 is one third of the Total air volume is. This does not worsen the drying process from the point of view of the equilibrium concentration.
  • the transport processes of the solvent through the porous textile material are the time-determining variable for the drying speed.
  • the energy conversion in the condensation section 5 is only a third of that which would be required in the case of arrangements according to the prior art.
  • the solvent concentration in the drying air circuit can be controlled during the drying process so that (by increasing L2 and reducing Ll) the concentration is lowered for a few minutes at the end of the batch so that a very low residual solvent content remains in the textile goods.
  • the contents of the drum must be cooled to a temperature of about 30 ° C. before emptying.
  • the removal of 80 ° C hot textiles would be uncomfortable for the operating personnel; secondly, the cold-removed goods crumple less than the hot-removed ones when lying before ironing.
  • the valve of the throttling point 4 is closed completely.
  • Valve 10 is also closed and the air is thus led directly into the drum via the cooler 5 and the opened valve 7 at a temperature of approximately 10.degree.
  • This circuit 1-2-3-5-7 cools the textile goods in the drum to the removal temperature in a short time.
  • bypassing the heater 6, it is not cooled in each batch and does not have to be heated up again for the next batch, but can remain in a hot state.
  • the condensation section 5 can also consist of a refrigerant evaporator and a refrigerant condenser of a heat pump in order to recover the heat from the air cooling.
  • the energy conversion of the condensation section 5 is only about 1/3 to 1/4 of the values customary today, the arrangement of a heat pump is then still a question of economy, which naturally depends on the size of the cleaning machine .
  • the drying process according to the invention can in principle be used for any solvent.
  • the arrangement according to the invention also avoids the energy consumption for cooling and reheating the solvent of the condensation path in the first five to ten minutes of drying, because at this point the drum temperature is still too low to noticeably load the solvent air with solvent vapor .
  • the drying air does not run at all through the condensation section 5 until the drying temperature is reached.
  • the drying air passes through the smallest possible cycle without intermediate cooling until the point in time at which the goods in the drum have reached the final drying temperature and thus have a noticeable loading on them Dry air with solvent vapor takes place in the drum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un dispositif et un procédé de nettoyage de textiles aux solvants organiques, comprenant un système de circulation d'air pour le séchage des textiles nettoyés et pour l'évaporation et la condensation des solvants restant dans les textiles. Le système de circulation d'air comporte principalement une soufflante (3) conçue pour le maintien du flux d'air, une unité de condensation (5) pour la condensation du solvant et au moins un système de chauffage (6) pour porter la température de l'air à la température de séchage. L'unité de condensation (5) est disposée dans une première dérivation parallèle à une partie du système de circulation d'air. Une partie (L2) du flux d'air traversant cette première dérivation peut être régulée par un système de régulation (4).
PCT/EP1995/002988 1994-08-09 1995-07-27 Dispositif et procede de sechage de textiles apres nettoyage aux solvants organiques WO1996005351A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944428174 DE4428174A1 (de) 1994-08-09 1994-08-09 Vorrichtung und Verfahren zum Trocknen von Textilien bei der Reinigung in organischen Lösemitteln
DEP4428174.9 1994-08-09

Publications (1)

Publication Number Publication Date
WO1996005351A1 true WO1996005351A1 (fr) 1996-02-22

Family

ID=6525261

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/002988 WO1996005351A1 (fr) 1994-08-09 1995-07-27 Dispositif et procede de sechage de textiles apres nettoyage aux solvants organiques

Country Status (2)

Country Link
DE (1) DE4428174A1 (fr)
WO (1) WO1996005351A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8100987B2 (en) 2004-03-16 2012-01-24 Jane D. Middleton Cleaning fluid and methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20010605A1 (it) * 2001-10-03 2003-04-03 Sodibo Spa Circuito di asciugamento per macchine lavasecco, per solvente n-propil-bromuro

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2183634A1 (fr) * 1972-05-08 1973-12-21 Robatel Slpi
US4262430A (en) * 1979-11-15 1981-04-21 Hoyt Manufacturing Corporation Combination solvent reclaimer and dryer
EP0053727A1 (fr) * 1980-11-25 1982-06-16 Multimatic Maschinen GmbH. & Co. Appareil de nettoyage à sec
EP0100082A2 (fr) * 1982-07-27 1984-02-08 DONINI INTERNATIONAL S.p.A. Système de récupération de chaleur pour le circuit de séchage et de désodorisation d'une installation de nettoyage à sec

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2183634A1 (fr) * 1972-05-08 1973-12-21 Robatel Slpi
US4262430A (en) * 1979-11-15 1981-04-21 Hoyt Manufacturing Corporation Combination solvent reclaimer and dryer
EP0053727A1 (fr) * 1980-11-25 1982-06-16 Multimatic Maschinen GmbH. & Co. Appareil de nettoyage à sec
EP0100082A2 (fr) * 1982-07-27 1984-02-08 DONINI INTERNATIONAL S.p.A. Système de récupération de chaleur pour le circuit de séchage et de désodorisation d'une installation de nettoyage à sec

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8100987B2 (en) 2004-03-16 2012-01-24 Jane D. Middleton Cleaning fluid and methods

Also Published As

Publication number Publication date
DE4428174A1 (de) 1996-02-15

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