GB1558913A - Drying of wet material - Google Patents

Drying of wet material Download PDF

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Publication number
GB1558913A
GB1558913A GB13744/77A GB1374477A GB1558913A GB 1558913 A GB1558913 A GB 1558913A GB 13744/77 A GB13744/77 A GB 13744/77A GB 1374477 A GB1374477 A GB 1374477A GB 1558913 A GB1558913 A GB 1558913A
Authority
GB
United Kingdom
Prior art keywords
vapour
chamber
steam
pressure
liquid
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.)
Expired
Application number
GB13744/77A
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.)
Electricity Council
Original Assignee
Electricity Council
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 Electricity Council filed Critical Electricity Council
Priority to GB13744/77A priority Critical patent/GB1558913A/en
Priority to NO781090A priority patent/NO147081C/en
Priority to DE19782813744 priority patent/DE2813744A1/en
Priority to SE7803581A priority patent/SE7803581L/en
Priority to FR7809219A priority patent/FR2386001B1/en
Publication of GB1558913A publication Critical patent/GB1558913A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • 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
    • F26B23/004—Heating arrangements using waste heat recovered from dryer exhaust gases by compressing and condensing vapour in exhaust gases, i.e. using an open cycle heat pump system
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO THE DRYING OF WET MATERIAL (71) We, THE ELECTRICITY COUNCIL, a British Body Corporate, of 30 Millbank, London, SW1P 4RD, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the follow mg statement: This invention relates to the drying of material which is passed, in a continuous process through a drying chamber.
Although the invention has particular application to the drying of a material containing water, it is generally applicable to the drying of materials carrying other liquid which can be removed as a vapour.
Thus, in considering the invention broadly.
reference will be made to a liquid and to a vapour, it being understood that the terms "liquid" and "vapour" refer to the same material in its different phases.
According to one aspect of the present invention, a method of drying a material by evaporation of a liquid therefrom comprises the steps of passing the material through a drying chamber, circulating superheated vapour through said chamber so that liquid is evaporated from said material resulting in more vapour leaving the chamber than enters it, separating and compressing the excess vapour leaving the chamber to raise its temperature, utilising the heat of the compressed vapour in a heat exchanger to heat the vapour to be circulated through the drying chamber, the pressure of the compressed vapour being sufficiently high that the compressed vapour condenses in the heat exchanger so producing a pressurised liquid, flashing-off vapour by throttling the pressurised liquid to a lower pressure, and feeding the flashed-off vapour into the uncompressed circulating vapour.The flashed-off vapour may be fed back into the circulating vapour at any point in the cycle but, as explained later. it is convenient to combine with the vapour leaving the chamber which is separated and then compressed.
According to another aspect of this invention, apparatus for drying a material by evaporation of a liquid therefrom comprises a drying chamber means for passing the material through said chamber, circulating means for circulating superheated vapour through said chamber so that liquid is evaporated from said material resulting in more vapour leaving the chamber than enters it, a compressor for compressing the excess vapour leaving the chamber to raise its temperature, heat exchanger means utilising the heat in the compressed vapour for heating the vapour to be circulated through the drying chamber, said compressor being arranged to compress the vapour to a pressure such that the compressed vapour condenses in said heat exchanger to give up latent heat of evaporation. throttling means to reduce the pressure of the liquid leaving said heat exchanger and thereby to produce vapour and means for feeding the vapour from the throttling means back into the uncompressed circulating vapour.
Using the present invention, a mechanical compressor can be employed to provide an energy input into the system and it becomes possible to recover the latent heat which has to be supplied to evaporate the liquid from the material to be dried. Generally speaking, this latent heat will represent a very substantial portion of the energy required to evaporate the liquid from the material to be dried. The compressor may be arranged to give a superheated output vapour at a temperature above (and preferably very substantially above) the saturation pressure of the compressed vapour. In general, no thermal energy would be required to sustain the cycle although, when the cycle is started up, thermal energy or a source of vapour or both would be needed during the warm-up period in order to make the cycle fully or partially self-sustaining.
Provided the energy losses from the system are kept low, no extra thermal energy would be needed to sustain operation. If energy "top-up" is required, this may be supplied as thermal energy or vapour. The condensed liquid from the heat exchanger is under pressure and extra top-up vapour is gained by the throttling of this compressed liquid leaving the system to the low pressure within the chamber, typically atmospheric pressure, and 'flashing-off" the vapour.
This flashed-off vapour is conveniently fed back into the cycle at the input to the compressor and provides a further energy input to the system. This energy input helps to maintain the energy balance which will be dependent on leakage from the system; such leakage may occur for example where the material to be dried is passed into and out of the drying chamber.
The re-use of flashed-off vapour in this way makes a significant improvement in the overall performance of the device. The improved energy efficiency (compared with a system in which flashed-off vapour is not utilised in this way) also enables a cheaper and simpler plant to be constructed for a given drying performance.
It is also possible to throttle the liquid to a pressure between the condensing pressure and the chamber pressure. thus producing some vapour at this intermediate pressure which could be used in another part of the process. The remaining liquid could then be further throttled to chamber pressure as before, producing further vapour.
Particularly in a continuous process in which the material to be dried is continuously fed into the drying chamber and dried material removed therefrom, air will leak into the drying chamber and will be circulated with the vapour. If the amount of air is kept to a small proportion of the vapour. say less than 10'it by weight. the cycle can proceed without any great loss of performance. However, the compressed liquid from the heat exchanger will emerge with a mixture of air and vapour. Thus, if significant air leakage into the system occurs, a separator may be provided to separate the condensed liquid from any air before that liquid is passed from the heat exchanger to the throttling means.
In applying the invention to the drying for example of a flat web of paper or textile or board material, this web may be passed continuously at uniform speed through a drying chamber into which superheated steam is fed at a temperature of for example 1500C. In the drying chamber, water will be evaporated from the material to produce steam and the outlet steam from the chamber will be at a lower temperature. for example 125"C. The amount of steam coming out of the chamber will be greater than that going in due to the evaporation from the material being dried and in a typical case might be say 2% greater. This outlet steam is split, the major part passing through a heat exchanger to be recirculated by a circulating fan and the excess being passed to a compressor.It will be immediately apparent that the circulating fan capacity and the physical configuration of the system will determine the amount of the superheated steam being recirculated and the balance will pass to the compressor: the system is self-regulating in this respect and there is no problem in separating the excess steam from the amount to be recirculated. In the compressor. as a typical example, the pressure might be increased to say 4.5 atmospheres but the compressor is designed to a superheated output, for example at a temperature of say 300"C which is substantially above the temperature of say 300"C which is substantially above the temperature of saturated steam at 4.5 atmospheres. This higher pressure superheated steam is passed through said heat exchanger where it is condensed.Typically the outlet water might be at 148"C if the circulating superheated steam into the chamber is at 1500C. This outlet water is under pressure and, by throttling it to atmospheric pressure, steam is produced which is fed back into the cycle, preferably at the compressor input so utilising further energy from the water before this water is released at atmospheric pressure. It will be readily apparent that the outlet pressure from the compressor and the amount of air present deterrlire the condensation temperature in the hnt exchanger.
The invention maybe applied to a spray drier in which wet material is atomised and the droplets dry as they pass through the superheated steam (or other fluid) in the drying chamber.
In the following description, reference will be made to the accompanying drawing which illustrates diagrammatically one embodiment of the invention.
Referring to this drawing there is shown diagrammatically a drying chamber 10 through which is passed continuously a web of material 11, for example paper or board or textile material. Seals 12, 13 are provided in the chamber walls for the inlet and outlet of the web. Automatic threading means are preferably provided for threading the web 11 through the chamber 10. A fan 14 circulates superheated steam substantially at atmospheric pressure through the drying chamber. In this particular embodiment the steam enters the drying chamber through an inlet 15 at a temperature of about 1500C and passes through the chamber 10 to an outlet 16 where the steam temperature in this particular embodiment is at about 125"C; this steam is recirculated through a heat exchanger 17 back to the fan 14.The excess steam coming from the drying chamber is passed to a compressor 18 where it is compressed to 4.5 atmospheres, and such that its temperature is raised to about 300"C (which is substantially above the temperature of saturated steam at this pressure).
This compressed superheated steam is fed through the aforementioned heat exchanger 17, which constitutes a condenser, to raise the temperature of the circulated steam fed back to the drying chamber to 1500C and producing water under pressure at about 1300C at an outlet 19.
Although the drawing shows diagrammatically the superheated steam being fed into the chamber 10 through an inlet port in the chamber, the manner of feed will depend on the chamber construction and type of material to be dried. In general, for drying a web, the superheated steam would be fed through a plurality of nozzles directing the steam onto the web to ensure rapid transfer of heat to the material to be dried.
In the system described, some air inevitably enters the drying chamber 10 through the seals 12, 13 and thus there will be some air and water vapour with the water at outlet 19. This water is therefore passed to a separator 20 where the air and water vapour is vented off to atmosphere at 21. The water, which is still under pressure and at a temperature of about 1300C is then fed to a throttling device 22 to flash-off steam at atmospheric pressure and 100"C. This steam is used as top-up steam and is fed back into the drying cycle. It is preferred to feed this steam into the compressor as shown at 23.
Hot water output from the throttling device 22 is drawn off at atmospheric pressure at 24 and may be utilised elsewhere.
Although a single stage throttling device has been shown, producing steam at atmos pheric pressure and water at 100"C, it would be possible to use a two-stage throttling process, producing some steam at a pressure above atmospheric and at a corresponding temperature above 100"C. The remaining liquid could then be throttled to atmospher ic pressure to produce further steam.
In a system such as has been described, the latent heat represents about 90% of the energy required for the heating and evapor ation of water from the material to be dried.
It will be noted that this latent heat is recovered by the system and that the energy supplied to the fan and compressor is sufficient to provide all necessary energy input and also to balance heat and steam leaks from the cycle.
WHAT WE CLAIM IS: 1. A method of drying a material by evaporation of a liquid therefrom comprising the steps of passing the material through a drying chamber, circulating superheated vapour through said chamber so that liquid is evaporated from said material resulting in more vapour leaving the chamber than enters it, separating and compressing the excess vapour leaving the chamber to raise its temperature, utilising the heat of the compressed vapour in a heat exchanger to heat the vapour to be circulated through the drying chamber, the pressure of the compressed vapour being sufficiently high that the compressed vapour condenses in the heat exchanger so producing a pressurised liquid, flashing off vapour by throttling the pressurised liquid to a lower pressure, and feeding the flashed-off vapour into the uncompressed circulating vapour.
2. A method as claimed in claim 1 wherein, before flashing-off vapour from the pressurised liquid, that liquid is passed through a separator to separate the liquid from any air/vapour.
3. A method as claimed in either claim 1 or claim 2 wherein the excess vapour is compressed to give superheated output vapour at a temperature above the saturation temperature corresponding to the pressure of the compressed vapour.
4. Apparatus for drying a material by evaporation of a liquid therefrom comprising a drying chamber, means for passing the material through said chamber, circulating means for circulating superheated vapour through said chamber so that liquid is evaporated from said material resulting in more vapour leaving the chamber than enters it, a compressor for cmpressing the excess vapour leaving the chamber to raise its temperature and heat exchanger means utilising the heat in the compressed vapour for heating the vapour to be circulated through the drying chamber, said compressor being arranged to compress the vapour to a pressure such that the compressed vapour condenses in said heat exchanger to give up latent heat of evaporation, throttling means to reduce the pressure of the liquid leving said heat exchanger and thereby to produce vapour, and means for feeding the vapour from the throttling means back into the uncompressed circulating vapour.
5. Apparatus as claimed in claim 4 wherein the vapour from said throttling means is fed into the input of the compressor.
6. Apparatus as claimed in either claim 4 or claim 5 wherein a separator is provided to separate the condensed liquid from any air before that liquid is passed from the heat exchanger to the throttling means.
7. Apparatus as claimed in any of claims 4 to 6 wherein said drying chamber has seals for the passage of a flat web of paper or textile or board material through the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. particular embodiment is at about 125"C; this steam is recirculated through a heat exchanger 17 back to the fan 14. The excess steam coming from the drying chamber is passed to a compressor 18 where it is compressed to 4.5 atmospheres, and such that its temperature is raised to about 300"C (which is substantially above the temperature of saturated steam at this pressure). This compressed superheated steam is fed through the aforementioned heat exchanger 17, which constitutes a condenser, to raise the temperature of the circulated steam fed back to the drying chamber to 1500C and producing water under pressure at about 1300C at an outlet 19. Although the drawing shows diagrammatically the superheated steam being fed into the chamber 10 through an inlet port in the chamber, the manner of feed will depend on the chamber construction and type of material to be dried. In general, for drying a web, the superheated steam would be fed through a plurality of nozzles directing the steam onto the web to ensure rapid transfer of heat to the material to be dried. In the system described, some air inevitably enters the drying chamber 10 through the seals 12, 13 and thus there will be some air and water vapour with the water at outlet 19. This water is therefore passed to a separator 20 where the air and water vapour is vented off to atmosphere at 21. The water, which is still under pressure and at a temperature of about 1300C is then fed to a throttling device 22 to flash-off steam at atmospheric pressure and 100"C. This steam is used as top-up steam and is fed back into the drying cycle. It is preferred to feed this steam into the compressor as shown at 23. Hot water output from the throttling device 22 is drawn off at atmospheric pressure at 24 and may be utilised elsewhere. Although a single stage throttling device has been shown, producing steam at atmos pheric pressure and water at 100"C, it would be possible to use a two-stage throttling process, producing some steam at a pressure above atmospheric and at a corresponding temperature above 100"C. The remaining liquid could then be throttled to atmospher ic pressure to produce further steam. In a system such as has been described, the latent heat represents about 90% of the energy required for the heating and evapor ation of water from the material to be dried. It will be noted that this latent heat is recovered by the system and that the energy supplied to the fan and compressor is sufficient to provide all necessary energy input and also to balance heat and steam leaks from the cycle. WHAT WE CLAIM IS:
1. A method of drying a material by evaporation of a liquid therefrom comprising the steps of passing the material through a drying chamber, circulating superheated vapour through said chamber so that liquid is evaporated from said material resulting in more vapour leaving the chamber than enters it, separating and compressing the excess vapour leaving the chamber to raise its temperature, utilising the heat of the compressed vapour in a heat exchanger to heat the vapour to be circulated through the drying chamber, the pressure of the compressed vapour being sufficiently high that the compressed vapour condenses in the heat exchanger so producing a pressurised liquid, flashing off vapour by throttling the pressurised liquid to a lower pressure, and feeding the flashed-off vapour into the uncompressed circulating vapour.
2. A method as claimed in claim 1 wherein, before flashing-off vapour from the pressurised liquid, that liquid is passed through a separator to separate the liquid from any air/vapour.
3. A method as claimed in either claim 1 or claim 2 wherein the excess vapour is compressed to give superheated output vapour at a temperature above the saturation temperature corresponding to the pressure of the compressed vapour.
4. Apparatus for drying a material by evaporation of a liquid therefrom comprising a drying chamber, means for passing the material through said chamber, circulating means for circulating superheated vapour through said chamber so that liquid is evaporated from said material resulting in more vapour leaving the chamber than enters it, a compressor for cmpressing the excess vapour leaving the chamber to raise its temperature and heat exchanger means utilising the heat in the compressed vapour for heating the vapour to be circulated through the drying chamber, said compressor being arranged to compress the vapour to a pressure such that the compressed vapour condenses in said heat exchanger to give up latent heat of evaporation, throttling means to reduce the pressure of the liquid leving said heat exchanger and thereby to produce vapour, and means for feeding the vapour from the throttling means back into the uncompressed circulating vapour.
5. Apparatus as claimed in claim 4 wherein the vapour from said throttling means is fed into the input of the compressor.
6. Apparatus as claimed in either claim 4 or claim 5 wherein a separator is provided to separate the condensed liquid from any air before that liquid is passed from the heat exchanger to the throttling means.
7. Apparatus as claimed in any of claims 4 to 6 wherein said drying chamber has seals for the passage of a flat web of paper or textile or board material through the
chamber.
8. Apparatus as claimed in any of claims 4 to 7 wherein the heat exchanger is arranged to heat the vapour before the vapour is passed into the drying chamber.
9. Apparatus as claimed in any of claims 4 to 8 wherein the compressor is arranged to give superheated output vapour at a temperature above the saturation temperature corresponding to the output pressure.
10. Apparatus for drying a material substantially as hereinbefore described with reference to the accompanying drawing.
11. A method of drying a material substantially as hereinbefore described.
12. A material dried by the method of any of claims 1 to 3 or claim 11.
GB13744/77A 1977-03-31 1977-03-31 Drying of wet material Expired GB1558913A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB13744/77A GB1558913A (en) 1977-03-31 1977-03-31 Drying of wet material
NO781090A NO147081C (en) 1977-03-31 1978-03-29 PROCEDURE AND DEVICE FOR DRYING MATERIALS
DE19782813744 DE2813744A1 (en) 1977-03-31 1978-03-30 METHOD AND DEVICE FOR DRYING MATERIAL
SE7803581A SE7803581L (en) 1977-03-31 1978-03-30 DRYER
FR7809219A FR2386001B1 (en) 1977-03-31 1978-03-30 MATERIAL DRYING THROUGH A ROOM WITH OVERHEATED STEAM CIRCULATION

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13744/77A GB1558913A (en) 1977-03-31 1977-03-31 Drying of wet material

Publications (1)

Publication Number Publication Date
GB1558913A true GB1558913A (en) 1980-01-09

Family

ID=10028599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13744/77A Expired GB1558913A (en) 1977-03-31 1977-03-31 Drying of wet material

Country Status (5)

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DE (1) DE2813744A1 (en)
FR (1) FR2386001B1 (en)
GB (1) GB1558913A (en)
NO (1) NO147081C (en)
SE (1) SE7803581L (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644664A (en) * 1980-08-06 1987-02-24 William Bradshaw A method of and apparatus for drying moisture containing material
GB2209383A (en) * 1987-11-12 1989-05-10 Thomas John Stubbing Method and apparatus for energy efficient drying
US5228211A (en) * 1987-11-12 1993-07-20 Stubbing Thomas J Method and apparatus for energy efficient drying
US5291668A (en) * 1992-04-03 1994-03-08 Tecogen, Inc. Steam atmosphere drying exhaust steam recompression system
NL1009726C2 (en) * 1998-07-23 2000-01-25 Klein Borculo Machine En Appar Dryer for bulk products such as foodstuffs, cow feed or animal litter, uses superheated steam or solvent vapor to capture the hot air
WO2000068486A1 (en) * 1999-05-11 2000-11-16 Tds Textildruckerei Suhr Ag Textile dying method for the treatment of textile webs with overheated steam
RU2178867C1 (en) * 2001-04-10 2002-01-27 Харин Владимир Михайлович Beet pulp drying plant
US12168849B2 (en) 2021-06-21 2024-12-17 Whirlpool Corporation Drying machine with a sieve in the drying circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660424A1 (en) * 1990-04-03 1991-10-04 Electricite De France PROCESS AND INSTALLATION FOR HIGH FLOW DRYING OF WET SOLID WOOD.
FR2785372B1 (en) * 1998-11-02 2001-01-26 Armines Ass Pour La Rech Et Le METHOD AND INSTALLATION FOR DRYING A MASS OF FIBROUS MATERIAL

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE30746C (en) * Erste Oesterreichische Soda - Fabrik in Hruschau (Oesterr. Schlesien) Process for industrial use! extraction of sulfur from hydrogen sulfide
DE360601C (en) * 1922-10-05 Waermetechnische Ges M B H Method of drying with superheated steam
CH95364A (en) * 1921-09-07 1922-07-01 Gutzwiller Otto Method and device for drying solid bodies in solution or liquids containing liquids.
DE487234C (en) * 1926-10-16 1929-12-04 Metallgesellschaft Ag Process for recycling waste heat from the broth in drying systems
GB663862A (en) * 1948-05-28 1951-12-27 Power Jets Res & Dev Ltd Improvements in or relating to drying and similar vaporising processes and apparatus
DE952617C (en) * 1951-02-20 1956-11-22 Krantz Soehne H Method and device for drying running webs of material, in particular in tensioning, frame and drying machines with air or steam as the drying agent
GB1269771A (en) * 1968-02-16 1972-04-06 Arjun Dev Passey Method of and apparatus for treating material
US3908285A (en) * 1973-12-19 1975-09-30 Dow Chemical Co Apparatus for solvent removal
US3946495A (en) * 1973-12-19 1976-03-30 Asriel Osdor Method and apparatus for drying moisture-containing solids particularly domestic refuse and sludge cakes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644664A (en) * 1980-08-06 1987-02-24 William Bradshaw A method of and apparatus for drying moisture containing material
GB2209383A (en) * 1987-11-12 1989-05-10 Thomas John Stubbing Method and apparatus for energy efficient drying
GB2209383B (en) * 1987-11-12 1992-02-19 Thomas John Stubbing Method and apparatus for energy efficient drying
US5228211A (en) * 1987-11-12 1993-07-20 Stubbing Thomas J Method and apparatus for energy efficient drying
US5291668A (en) * 1992-04-03 1994-03-08 Tecogen, Inc. Steam atmosphere drying exhaust steam recompression system
NL1009726C2 (en) * 1998-07-23 2000-01-25 Klein Borculo Machine En Appar Dryer for bulk products such as foodstuffs, cow feed or animal litter, uses superheated steam or solvent vapor to capture the hot air
WO2000068486A1 (en) * 1999-05-11 2000-11-16 Tds Textildruckerei Suhr Ag Textile dying method for the treatment of textile webs with overheated steam
RU2178867C1 (en) * 2001-04-10 2002-01-27 Харин Владимир Михайлович Beet pulp drying plant
US12168849B2 (en) 2021-06-21 2024-12-17 Whirlpool Corporation Drying machine with a sieve in the drying circuit

Also Published As

Publication number Publication date
NO147081B (en) 1982-10-18
SE7803581L (en) 1978-10-01
NO147081C (en) 1983-01-26
FR2386001A1 (en) 1978-10-27
DE2813744A1 (en) 1978-10-12
DE2813744C2 (en) 1988-04-14
NO781090L (en) 1978-10-03
FR2386001B1 (en) 1985-12-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931208