EP1000306A1 - Vacuum drying device - Google Patents
Vacuum drying deviceInfo
- Publication number
- EP1000306A1 EP1000306A1 EP98943848A EP98943848A EP1000306A1 EP 1000306 A1 EP1000306 A1 EP 1000306A1 EP 98943848 A EP98943848 A EP 98943848A EP 98943848 A EP98943848 A EP 98943848A EP 1000306 A1 EP1000306 A1 EP 1000306A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating plates
- housing
- heating
- drying device
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/041—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/001—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement the material moving down superimposed floors
- F26B17/003—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement the material moving down superimposed floors with fixed floors provided with scrapers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/008—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement the material being a slurry or paste applied onto moving elements, e.g. chains, plates, for drying thereon, and subsequently removed therefrom
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
- F26B17/128—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft with provisions for working under reduced or increased pressure, with or without heating
Definitions
- the present invention relates to a vacuum drying device according to the preamble of patent claim 1.
- a vacuum drying device of the type mentioned is known from DE 31 40 624 AI.
- this known device has a number of endless conveyor belts which are arranged inside the housing and run parallel to one another.
- the heating plates are arranged at a distance above the conveyor belts in such a way that the conveyor belt can run under the heating plates together with the material to be dried which is placed thereon. Further heating plates are arranged at a short distance below the conveyor belts in order to introduce heat into the material to be dried through the conveyor belts.
- a disadvantage of this known vacuum drying device is that it requires a very high mechanical outlay and that the supply of heat to the material to be dried takes place with a low degree of efficiency due to the lack of direct contact.
- the distillation of liquids is completely impossible with this known device.
- the object of the present invention is therefore to create a vacuum drying device of the type mentioned at the outset which avoids the disadvantages mentioned and which, with a simple structural design, has a high degree of efficiency and thus low production and operating costs and for the treatment of both Solids as well as liquids or mixtures thereof is suitable.
- heating plates are formed with heating medium channels with inlets and outlets,
- an additional pump or an additional blower is provided, the suction side of which is connected to a region of the interior of the housing that is free of liquid or good and the pressure side of which is connected to the inlets of the heating medium channels,
- outlets are connected to the suction side of the vacuum pump
- That a conveyor is provided for the movement of the goods between the heating plates, by means of which separate conveying means located between the heating plates and / or the heating plates themselves can be moved in an oscillating manner.
- the material or the liquid comes into direct contact with the heating plates, so that here heat transfer is ensured with a high degree of efficiency.
- the low operating costs also contribute to the fact that the liquid vapor rising from the material or the liquid is used for heating the heating plates.
- the heating plates are arranged in an approximately horizontal position in the housing, adjacent heating plates being offset horizontally relative to one another, and that a flat conveyor grate is arranged as a means of conveyance between two adjacent heating plates.
- the oscillating moving grids convey the material to be dried along the surface of the heating plates from one end to the other, the material passing through the housing from top to bottom in a meandering shape. After slipping over one end of the upper heating plate, the goods fall onto the displaced heating plate underneath and are then transported in the other direction.
- An alternative embodiment of the vacuum drying device is characterized in that the heating plates are arranged in an approximately vertical position in the housing and that the conveying means are each between two adjacent a flat conveyor grid is arranged.
- relatively large quantities of goods can advantageously be moved between the heating plates in a plurality of paths running parallel to one another, so that this version of the device is particularly suitable for goods which can be dried sufficiently with a relatively short treatment time and in which large quantities attack.
- the heating plates are mounted in the housing in an oscillating, approximately vertical position by the conveying device, that flexible lines are provided as connecting lines for the heating medium channels between the heating plates, and that the edges of the heating plates pointing to the dispensing opening are included elastic wipers pointing at an angle to the dispensing opening are provided.
- This configuration of the vacuum drying device does not require separate conveying means, such as the previously mentioned conveying grids, but uses the heating plates themselves by moving them for the desired conveying of goods.
- the oscillating movement of the heating plates can be generated, for example, by means of a crank mechanism, whereby by changing the speed of the crank mechanism and / or the distance between the heating plates, an influence on the dwell time of the goods between the heating plates can be achieved.
- the dwell time can be further influenced by ribs or beads on the heating plates pointing outwards.
- the flexible lines mentioned enable the heating plates to move relative to one another and to the housing, so that the heating medium can be guided without problems.
- the wipers provided on the lower edge of the heating plates ensure that the dried goods are conveyed to the discharge opening, so that no separate conveyors are required for this. funds must be earmarked.
- the conveying grids or the heating plates fasten on at least one side a multiplicity of flexible or articulated protruding in the desired conveying direction Have wipers.
- the wipers are connected to one another near their free ends by rods or cables.
- the heating plates are given in claim 6.
- the heating plates are designed as double-walled hollow bodies, large cross-sectional areas are made available for guiding the heating medium, so that a large heating medium volume throughput with low flow resistance is possible.
- the alternatively mentioned single-walled heating plates offer the specific advantage that they require less material and can therefore be carried out much more easily. In addition, less heating medium is guided in the individual heating plates, so that a weight saving can also be achieved in this way. Since the heating plates distribute the heat supplied by the heating medium within the heating medium channels through their heat-conducting properties over the surface of the heating plates, this also ensures that the material to be dried is heated to a large area.
- Suitable materials for the heating plates are, for example, aluminum or titanium, which are light and corrosion-resistant and good heat conductors.
- the heating plates are composed of several identical heating plate sections.
- These heating plate sections can, for example, be provided on at least two mutually opposite edges with connecting elements that can preferably be brought into engagement with one another without tools, which allows simple assembly of several heating plate sections to form heating plates in a desired surface area.
- the connecting elements can be hooking and / or latching elements, for example.
- the vacuum pump used in the vacuum drying device is expediently a liquid ring vacuum pump, preferably a water ring vacuum pump, which is directly connected upstream of a liquid buffer container.
- a liquid ring vacuum pump is insensitive to liquids supplied on the suction side and to any small-sized solid particles contained therein.
- a liquid ring vacuum pump works with very little wear, which makes it particularly suitable for use in the vacuum drying device according to the invention. It is also possible to use another vacuum pump or to use several identical or different vacuum pumps in series or parallel connection.
- This buffer container ensures, on the one hand, that the pump designed as a liquid ring vacuum pump can always be supplied with sufficient liquid to maintain the liquid ring and that, on the other hand, overloading of the pump by suddenly occurring larger quantities of liquid, as can occur in particular at the beginning of a drying process, is avoided becomes. Any excess liquid can be drained through an overflow; to compensate for one A refill line can be provided for a lack of liquid in the buffer tank.
- an adjustable valve depending on the temperature in the vacuum pump is provided between the liquid buffer tank and the vacuum pump, the passage of which increases with increasing Temperature increased and reduced as the temperature dropped. This compensates for an increased loss of liquid from the liquid ring that occurs at high pump temperatures by correspondingly increased liquid replenishment from the buffer container, so that the liquid ring is always self-regulating and the liquid ring vacuum pump also remains functional.
- the vacuum pump with its drive motor and possibly a drive motor of the additional pump or the additional blower be arranged within the housing and that the housing is designed with a heat insulation jacket, so that the motor Waste heat is made fully usable without the need for complex measures.
- a heat exchanger is switched on in the course of a connecting line from the outlets of the heating medium channels to the suction side of the vacuum pump. through the Air as a second medium can either be circulated inside the housing or as fresh air from outside and then passed out again.
- the air which is passed through the heat exchanger as the second medium is expediently moved in the circuit inside the housing, thermal energy from the air being passed to the liquid vapor which is passed through the heat exchanger as the first medium and, if appropriate, with this together the liquid forming the first medium is transferred from the material to be dried.
- the predetermined temperatures within the housing of the vacuum drying device are exceeded, the temperature level in the housing can be reduced by guiding fresh air as the second medium through the heat exchanger.
- the heat exchanger acts as a condenser for the liquid vapor from the material to be dried, as a result of which the drying process is promoted by means of the condensation mentioned due to an increase in the vacuum.
- the housing can be formed at least over part of its inner surface with or as a heating jacket with heating medium channels, the inlet of these heating medium channels with the outlet side of the vacuum pump and the outlet of these heating medium channels with a liquid collecting container and a steam discharge line leading out of its upper region is connected.
- the vacuum drying device according to the invention can be used for many applications, for example for drying bulk materials, in particular light materials, such as plastic granules or chips of wood, wood chips or animal feed, in particular in the form of chopped material. Another area is sludge dewatering, especially sewage sludge, or from moist brown coal or wet coal dust.
- the drying device can also be used in the chemical and pharmaceutical industries, for example for the concentration of waste liquids, for the recovery of solid or liquid substances from production liquids or for distillation.
- the vacuum drying device can be stationary or mobile, in the latter case preferably in a standard container.
- the container can be standing or lying and with different cross-sectional shapes.
- Known components can be used for the input and output opening, e.g. Cell wheel locks, pinch valves or slide or ball valves.
- the device can be loaded and emptied in batches or more or less continuously, with input and output not having to be carried out simultaneously or in the same way.
- the material or liquid to be entered can be preheated before input in order to shorten the heating time within the container, the output, still warm material or excess condensate which is obtained anyway, preferably being used for preheating.
- FIG. 1 shows a first vacuum drying device in a schematic illustration with a removed front housing wall
- FIG. 2 shows a second vacuum drying device in the same representation as FIG. 1,
- Figure 3 shows a third vacuum drying device, also in a representation like Figure 1, and
- Figure 4 is a vertical section through an arrangement of heating plates as part of a fourth vacuum drying device.
- the first exemplary embodiment of a vacuum drying device shown in FIG. 1 has an upright housing 3, which can be cylindrical or angular.
- a plurality of heating plates 4 here a total of twelve, are fixedly arranged in a parallel vertical orientation.
- a conveyor grid 5 is attached between two adjacent heating plates 4 and carries a number of scrapers 8 on each of its sides facing the heating plates 4.
- Each conveyor grid 5 is suspended at the top from at least one crankshaft 11 which can be driven in rotation by a motor indicated at the top left in FIG. By rotating the crankshaft 11, the conveying grids 5 move in an oscillating manner in the vertical direction and also perform a circular movement at least in the upper region. This movement moves the material to be dried from top to bottom between the heating plates 4.
- the residence time of the material to be dried between the heating plates 4 can be controlled to a desired extent by selecting the crankshaft speed and by designing and numbering the wipers.
- a vacuum pump 12 is provided in the lower part of the housing 3, here a water ring vacuum pump, which can be driven by an electric motor 13.
- the suction side of this vacuum pump 12 is connected to the interior 30 of the housing 3, but this connection is not direct, but instead leads via heating medium channels 41 provided in the heating plates 4.
- liquid vapor escapes from it, e.g. Water vapor, which rises upwards and arrives there in a fan 15, which is designed with a radial fan that can be driven by an electric motor 15.
- the motor 15 is also arranged in the housing 3, which saves a vacuum-tight shaft seal.
- the steam is conveyed by the fan 14 into a distributor line 16 which is in flow connection with all heating medium channels 41 via inlets 41 '.
- the steam flows in several parallel flow paths from top to bottom through the heating medium channels 41 in the heating plates 4 and partially condenses there, so that the direct heat of the steam and additionally its heat of condensation is given off to the heating plates 4 and via these to the material to be dried.
- the now present vapor-liquid mixture leaves the heating medium channels 41 via outlets 41 ′ and is in a collecting line 17 collected and passed via a heat exchanger 18 to a liquid buffer container 21.
- the buffer container 21 contains a certain liquid supply in order to always be able to supply the immediately following liquid ring vacuum pump 12 with sufficient liquid to maintain the liquid ring within the pump 12.
- the buffer container 21 is used to collect large amounts of liquid which accumulate in gushing, particularly at the start of a drying process, so that these do not lead to an overload of the vacuum pump 12.
- Air can flow through the heat exchanger 18 as a second heat-exchanging medium, as indicated by arrows.
- Two modes of operation are possible here: In a first mode of operation, a housing flap 20 is fixed in the closed position shown in solid lines. In this state, air is conveyed in the circuit inside the housing 3, a cooling fan 13 ′ which is present anyway on the electric motor 13 for the vacuum pump 12 and which is connected via an air duct 19 to the heat exchanger 18 being used to maintain the air flow.
- the housing flap 20 is pivoted into an open position shown in dashed lines, in which fresh air can then be passed through the heat exchanger 18 from the outside and then blown out again.
- the vacuum in the interior 30 of the housing 3 is maintained unchanged by the intermediate floor 31.
- the outlet side of the vacuum pump 12 is in flow connection with a heating jacket 22 which is arranged on the inner surface of the housing 3.
- the liquid vapor emitted by the vacuum pump 12 via its outlet side arrives after flowing through the heating jacket 22 and Partial condensation takes place in a collecting container 23, in which steam and liquid are separated from one another.
- the liquid collects in the lower part of the container 23 and can be withdrawn from it as required through a liquid discharge line 24 '.
- the liquid vapor escapes from the upper part of the collecting container 23 through a steam discharge line 24.
- the line 24 can open directly into the atmosphere; in the case of vapors containing pollutants, a further treatment is carried out which is not the subject of this application.
- liquid can be transferred from the collecting container 23 into the buffer container 21 by means of a float-controlled valve 25 via a connecting line 25 '.
- FIG. 2 of the drawing shows an example of a vacuum drying device with a closed cuboid housing 3, which has an input opening 1 in its upper wall, which is provided with a cellular wheel sluice and into which the material to be dried is input according to the arrow.
- the lower wall of the housing 3 has an outlet opening 2, which is also provided with a cellular wheel sluice and through which the dried material can be dispensed.
- the housing 3 is set up for connection to the suction side of a vacuum pump (not shown here), the direction of flow of the air to be extracted from the housing 3 and of the liquid vapor carried along with it being indicated by an arrow.
- a total of 16 flat heating plates 4 are arranged in the horizontal direction at a spacing parallel to one another, the heating plates 4 having a rectangular outline when viewed from above.
- a heating medium can be passed through the heating plates 4, as has already been explained in connection with FIG. 1.
- the heating plates 4 are arranged one above the other so that they are laterally offset from the heating plate 4 below.
- the upper heating plate 4 is shortened in order to create the most favorable contact surface for the material to be dried introduced through the input opening 1.
- a flat conveyor grid 5 is arranged, which has a plurality of elastic wipers 8 on the downward-facing side, which are inclined obliquely downward against the direction of movement, so that they exert a directed conveying effect and a scraping effect.
- the wipers 8 are provided on each conveyor grille 5, only the upper two and the lower conveyor grids 5 being shown with wipers 8 to simplify the illustration in FIG.
- the conveyor grids 5 are alternately connected either to a vertical rod 7 or a vertical rod 1 ', so that each of the rods 7, 7' has eight connection points with conveyor grids 5.
- a rotary drive (not shown), for example an electric motor, which drives a crank 6 which is connected at its two outer radial points via an elongated hole and pin on the one hand to the rod 7 and on the other hand to the rod 7 '.
- a crank 6 which drives a crank 6 which is connected at its two outer radial points via an elongated hole and pin on the one hand to the rod 7 and on the other hand to the rod 7 '.
- the direction in which the material to be dried takes is indicated by small arrows at the top in FIG. 2. They indicate that the material entered through the input opening 1 is first conveyed to the left on the second upper heating plate 4, then falls onto the heating plate 4 underneath and is conveyed to the right, etc. This results overall in a meandering course of the conveying path of the material, the material at the bottom of the housing 3 is conveyed to the discharge opening 2 by the lower conveyor grid 5 with the wipers 8 attached to it.
- FIG. 3 shows the housing 3 of a third vacuum drying device, with the inlet opening 1 and the outlet opening 2 and the connection for a vacuum pump, as in FIG. 2.
- each heating plate 4 is attached at its upper right corner to one end of a crankshaft 9 extending radially to the shaft of a rotary drive, not shown.
- the upper left corner of each heating plate 4 is suspended from each rod 10 in the housing 3, which can move according to the arrow when the crankshaft 9 is moved in the direction of the arrow by the rotary drive.
- the heating plates 4 are thus placed in an lating movement offset, in which adjacent plates 4 move in opposite directions.
- the lower edge of the heating plates 4 is provided with wipers 8 which carry out a conveying movement in the direction of the discharge opening 2 when the crankshaft 9 rotates.
- FIG. 4 of the drawing shows, in a partial vertical section, a fourth embodiment of a vacuum drying device in which the individual heating plates 4 are again arranged parallel to one another in vertical planes.
- the heating plates 4 hang here on a rotatably drivable crankshaft 11, every second heating plate 4 being mounted on a crank remote from the axis of rotation 11 'of the crankshaft, while the heating plates 4 in between are arranged exactly on the axis of rotation 11' of the crankshaft 11.
- the individual cranks of the crankshaft 11 are each offset by 180 ° to one another, so that there is an opposite movement of the up and down movable heating plates 4 in the direction of the arrows.
- the further heating plates 4 arranged between the heating plates 4 movable by the crankshaft 11 maintain their position even when the crankshaft 11 is rotating.
- the stroke of the crankshaft 11 is represented by the dimension H.
- the individual heating plates 4 are of single-walled design and have tubular heating medium channels 41 in their course.
- the heating medium channels 41 can be used to promote the heating medium for heating the heating plates 4, whereby heat conduction within the heating plates 4 also causes them Areas spaced from the channels 41 are heated.
- FIG. 4 shows that the heating plates 4 are here modularly composed of a plurality of heating plate sections 4 '. are set.
- Each heating plate section 4 ' comprises a heating medium channel 41.
- each heating plate section 4' has on its upper edge and on its lower edge connecting elements 42, 43, by means of which the individual heating plate section 4 'can be assembled to form the heating plates 4 shown without tools.
- the assembly can be carried out simply by hooking into one another, for which purpose the individual heating plate sections 4 ′ are initially tilted against one another. In this tilted position, the connecting elements 42, 43 can be inserted into one another. If the heating plate sections 4 'are then brought into the extended position shown in FIG. 4, the connection is effected with sufficient releasability, because this connection between the individual heating plate sections 4' can then no longer be released simply by vertical movement.
- a particularly dense arrangement of heating plates 4 is advantageously possible if, as shown in the drawing, they are arranged in such a way that the stroke H is slightly smaller than the distance between two heating medium channels 41 one above the other in a heating plate 4. In this way, a very large heat transfer area can be made available, which enables effective heating of the material to be dried.
- the shape of the heating plates 4 ensures that the material to be dried cannot trickle freely between the heating plates 4 from top to bottom. Rather, the material to be dried has to take a meandering path between the heating plates 4, which extends the dwell time of the material in the area of the heating plates 4 and thus intensifies the drying.
- the vacuum drying device according to FIG. 4 can be completely carried out on separate conveying means between the heating plates 4 dispense. This makes the construction and operation of the vacuum drying device particularly reliable and inexpensive.
- wipers 8 can be provided on the heating plates 4, as is shown on the two heating plates 4 on the right in FIG.
- the wipers 8 are in the present case by simple angle profiles, e.g. made of plastic, which are clamped between two interlocking connecting elements 42, 43 of two adjacent heating plate sections 4 '. In this way, the wipers 8 are held reliably and are at the same time very easy to attach.
- the vacuum drying device according to FIG. 4 also includes an airtight housing with an input and output lock and a vacuum pump with which the interior of the housing can be evacuated; however, these parts are not shown again in FIG. 4.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997134212 DE19734212B4 (en) | 1997-08-07 | 1997-08-07 | Vacuum drying device |
DE19734212 | 1997-08-07 | ||
PCT/EP1998/004883 WO1999008058A1 (en) | 1997-08-07 | 1998-08-05 | Vacuum drying device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1000306A1 true EP1000306A1 (en) | 2000-05-17 |
Family
ID=7838274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98943848A Withdrawn EP1000306A1 (en) | 1997-08-07 | 1998-08-05 | Vacuum drying device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1000306A1 (en) |
DE (1) | DE19734212B4 (en) |
WO (1) | WO1999008058A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19931105B4 (en) * | 1999-07-06 | 2007-09-27 | Solar Und Vakuum Technologie (Svt) A.G. | Vacuum drying device with a heat exchanger |
NL1022588C2 (en) * | 2003-02-05 | 2004-08-06 | Schoot Engineering B V V D | Method and device for solidifying a pumpable mass. |
ES2347397B1 (en) * | 2007-05-17 | 2011-09-29 | Obschestvo S Ogranichennoy Otvetstvennostyu | INSTALLATION FOR VACUUM DRYING. |
AT523858B1 (en) * | 2020-05-19 | 2022-04-15 | Andreas Fritsche | Device for drying bulk material |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE88429C (en) * | ||||
US2050477A (en) * | 1935-03-15 | 1936-08-11 | Weisselberg Arnold | Method and apparatus for spreading divided material for treatment or other purposes |
DE734698C (en) * | 1941-04-11 | 1943-04-21 | Stahlbau Hoepfner | Steam-heated plate dryers, especially for brown coal |
BE505127A (en) * | 1950-08-14 | |||
FR1255654A (en) * | 1960-04-22 | 1961-03-10 | Ifoeverken Ab | Process for obtaining dry materials from suspensions and emulsions |
CH472646A (en) * | 1968-11-07 | 1969-05-15 | Disler Franz | Vacuum belt dryer |
AU6871374A (en) * | 1974-05-15 | 1975-11-13 | Gelder A V | Vacuum dehydration |
FR2382659A1 (en) * | 1977-03-04 | 1978-09-29 | Sudre Pierre | Thermal dehydration of bulk material esp. food prods. - such as fodder, cereals, meat, fish and vegetables |
DE2916187C2 (en) * | 1979-04-21 | 1981-07-09 | Strabag Bau-AG, 5000 Köln | Device for drying and heating tar- or bitumen-coated mineral mix |
JPS5817663B2 (en) * | 1980-03-25 | 1983-04-08 | 雪印乳業株式会社 | Dry material pulverization and discharge device in multi-stage continuous vacuum drying equipment |
US4330946A (en) * | 1980-09-23 | 1982-05-25 | Ralph S. Tillitt | High efficiency material drying |
FR2510736B1 (en) * | 1981-07-28 | 1986-07-18 | Beghin Say Sa | VAPOR RECOMPRESSION DRYING PROCESS |
DE3215753A1 (en) * | 1982-04-28 | 1983-11-03 | Basf Ag, 6700 Ludwigshafen | METHOD AND ARRANGEMENT FOR CARRYING OUT THE METHOD FOR LOADING AND EMPTYING THE DRY TRAYS OF A DRYING CABINET |
DE3611773A1 (en) * | 1986-04-08 | 1987-10-15 | Heinz Eichholz | CONDENSATION METHOD FOR WATER VAPOR UNDER PRESSURE |
DE4208183C1 (en) * | 1992-03-12 | 1993-07-29 | Preussag-Noell Wassertechnik Gmbh, 6100 Darmstadt, De | Sludge evaporation and drying assembly - has plate packets as evaporation surfaces for exposure to compressed steam in a pressure vessel |
DE9214670U1 (en) * | 1992-07-24 | 1993-02-11 | Wohllaib, Maximilian, 7951 Erolzheim, De | |
DE4408147C1 (en) * | 1994-03-11 | 1995-08-24 | Heinz Eichholz | Vacuum drying process and device for carrying it out |
US5570516A (en) * | 1995-07-10 | 1996-11-05 | Huang; Ching-Yuan | Drying system having continuously connected close spiral conveyers |
-
1997
- 1997-08-07 DE DE1997134212 patent/DE19734212B4/en not_active Expired - Fee Related
-
1998
- 1998-08-05 WO PCT/EP1998/004883 patent/WO1999008058A1/en not_active Application Discontinuation
- 1998-08-05 EP EP98943848A patent/EP1000306A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9908058A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19734212A1 (en) | 1999-02-11 |
DE19734212B4 (en) | 2007-10-11 |
WO1999008058A1 (en) | 1999-02-18 |
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Legal Events
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