EP3411646A1 - Sécheur continu comportant au moins deux sections - Google Patents

Sécheur continu comportant au moins deux sections

Info

Publication number
EP3411646A1
EP3411646A1 EP17707754.2A EP17707754A EP3411646A1 EP 3411646 A1 EP3411646 A1 EP 3411646A1 EP 17707754 A EP17707754 A EP 17707754A EP 3411646 A1 EP3411646 A1 EP 3411646A1
Authority
EP
European Patent Office
Prior art keywords
air
section
exhaust air
exhaust
supply
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.)
Pending
Application number
EP17707754.2A
Other languages
German (de)
English (en)
Inventor
Tobias Latein
Thomas Christian Laxhuber
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.)
Stela Laxhuber GmbH
Original Assignee
Stela Laxhuber 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
Priority claimed from DE102016101725.6A external-priority patent/DE102016101725A1/de
Priority claimed from DE102016103685.4A external-priority patent/DE102016103685C5/de
Application filed by Stela Laxhuber GmbH filed Critical Stela Laxhuber GmbH
Publication of EP3411646A1 publication Critical patent/EP3411646A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • 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
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
    • 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 invention relates to a continuous dryer for drying a product by means of hot air in at least two sections, which are traversed successively by the good and are largely separated air flow moderately.
  • the invention further relates to a continuous dryer for drying a product by means of hot air with a first and a second section, which are traversed by the good in a transport direction and air flow largely separated, wherein an air supply means for supplying fresh air to the second section, an exhaust air return device for Returning exhaust air from the second section into the first section as supply air and an exhaust air discharge means for discharging exhaust air from the first section are provided.
  • a continuous dryer is a dryer in which the material to be dried is transported continuously or in batches through the dryer.
  • a dryer is in particular a belt dryer which conveys the material to be dried by means of a belt through the continuous dryer.
  • the material to be dried such as sewage sludge, wood shavings, woodchips, RDF (refuse-derived fuel), SSW (solid shredded waste), MSW (municipal solid waste), household waste, grass or agricultural products and by-products such as sugar beet pulp, is initially involved wet or wet.
  • the estate is dried, whereby moisture by means of Warm air is withdrawn.
  • the hot air is generated extra by, in particular, air from the environment of the continuous dryer is heated.
  • the heated fresh air from the environment is supplied to the second section by means of an air supply device.
  • this fresh air is cooled by absorbing moisture from the material to be dried and enriched with water and thus represents exhaust air.
  • the exhaust air is nevertheless recirculated from the second section into the first section as supply air by means of an exhaust recirculation device , This recirculated supply air then flows through the first section.
  • the sections are thus separated as far as possible, that in them different Liehe air flows are possible, each of which may have different relative humidity and different temperature.
  • energy is needed to heat the supply air as warm air. This energy is lost when the generated hot air is discharged into the environment of the continuous dryer after drying the material. Therefore, as explained above, the aim is basically to recirculate produced hot air through many sections as far as possible.
  • the invention has for its object to provide a continuous dryer for drying a good by means of hot air, which makes possible a further energy saving compared to known continuous dryers.
  • This object is achieved according to the invention with a continuous dryer for drying a good by means of hot air with a first and a second section, which are passed by the good in a transport direction successively and air flow largely separated created.
  • a fresh air supply means for supplying fresh air as a first supply air into the first section
  • an exhaust return means for discharging exhaust air from the second section and for returning exhaust air as a second supply air back into the second section
  • a heat exchanger provided, through which on the one hand the fresh air and on the other hand the exhaust air are guided, for transmitting waste heat of the exhaust air into the fresh air.
  • an exhaust air return device carries out exhaust air from a drying process from the second section at the continuous dryer. This exhaust air is at least partially in the second section of the continuous dryer returned.
  • the exhaust air is thereby guided according to the invention to a heat exchanger, is transferred to the thermal energy or waste heat from the exhaust air to the also flowing through the heat exchanger first supply air.
  • the two streams of exhaust air and first supply air are separated from each other at the heat exchanger, in particular by means of a separating surface. On the separation surface then flows on one side of the exhaust air and on the other side along the first supply air. Through the separation surface heat energy of the exhaust air is released to the fresh air.
  • the waste heat of the exhaust air heats so the fresh air supplied to the continuous dryer and heat energy from the exhaust air is recovered.
  • the air flows of exhaust air and first
  • the heat exchanger according to the invention is dimensioned such that moisture condenses on it from the exhaust air. Moisture condenses when the relative humidity of the relevant air reaches 100% (in words: one hundred percent).
  • the relative humidity in air increases as the air cools, as in this case the warm exhaust air.
  • the relative humidity decreases when the air is heated.
  • Heat exchanger has so advantageous three functions.
  • the first function is to dehumidify the exhaust air flowing through the heat exchanger.
  • the second function is to heat the incoming fresh air.
  • the third function is to reduce the relative humidity of the incoming fresh air due to the heating of this fresh air.
  • a first heater is also provided, for heating the first supply air before it is fed into the first section.
  • a heater heats air by means of energy supply.
  • the heater is, for example, a hot water heat exchanger, a steam heat exchanger, an electric heater or a heating burner.
  • the relative humidity of this supply air A low air humidity is advantageous when drying, since the supply air can absorb more water again. Warmer supply air can thus absorb more water than colder supply air.
  • the first supply air is fed to the first section according to the invention.
  • the moisture content of the material to be dried is still greatest in relation to its conveying direction. Therefore, it is particularly advantageous if the water absorption capacity of the supplied air in this section is particularly high.
  • a second heater is advantageously provided for heating the second supply air before its return to the second section.
  • the relative humidity of air decreases as it is heated.
  • a second heater, which heats the second supply air so also advantageously reduces the relative humidity in this second supply air and increases the temperature of the second supply air.
  • a low relative humidity in the second supply air is particularly advantageous when it is necessary to remove relatively low residual moisture from the material to be dried in the second section.
  • the exhaust air recirculation device is further provided with a return line, which serves for the direct return of exhaust air from the second section as circulating air back into the second section.
  • the exhaust air recirculation device then returns exhaust air from the second section to the second section directly and without intermediate treatment by means of the return line.
  • the directly recirculated exhaust air from the second section is mixed with the second supply air supplied there, which has the consequence that flows into the second section, a mixture of treated supply air and untreated exhaust air. This mix points a mixing temperature and a mixed air humidity.
  • the supply air is colder and drier and the exhaust air warmer and wetter.
  • the supply air can be very cold and very dry, because it is heated directly by the albeit moist but warm portion of the recirculated exhaust air. Furthermore, with this direct feedback also a particularly simple control of the humidity and the temperature of the air in the second section is possible.
  • the second section at least two regions or subsections which are largely largely separated in terms of air flow are provided, and the exhaust air from the two regions is collected through the heat exchanger.
  • the second section is in turn subdivided in this way, in at least a first and a second area. These areas are consecutively connected in series in the transport direction.
  • the respective area usually has its own temperature and its own relative humidity of the air flow within this area.
  • this temperature and relative humidity is adapted to the prevailing humidity conditions of the material to be dried there.
  • Exhaust air to be discharged from the respective areas is brought together and directed together to the heat exchanger.
  • An exhaust air mixture advantageously forms with the collection of the exhaust air.
  • the exhaust air mixture has a largely uniform, common relative humidity and a mixing temperature. It is particularly advantageous that not a separate heat exchanger must be provided for each individual area, but that in particular a single heat exchanger sufficient for the entire exhaust air to be discharged from the several areas.
  • an exhaust air sensor is advantageously provided in at least one of the sections and / or areas, by means of which the moisture in the exhaust air is to be determined.
  • such an air sensor determines the relative humidity and / or the temperature of the air flowing in or around it.
  • the relative air humidity of the exhaust air can be determined by means of the exhaust air sensor.
  • a supply air sensor is further provided, by means of which in the supply air whose moisture is to be determined.
  • the supply air sensor determines the relative humidity of the inflowing supply air. It is advantageous to determine the relative humidity with which the supply air flows into the respective section. It is also particularly advantageous to determine whether and by how many degrees Celsius the supply air is additionally to be heated by a heater in order to achieve a desired relative humidity in the supply air.
  • two belts are further provided for transporting the goods through the continuous dryer, which are assigned in particular the first section and the second section.
  • Such a two-part belt in a continuous dryer allows each of the two sections to have their own
  • Has band can also be arranged spatially separated from each other, in particular one above the other.
  • the transport direction is preferably directed from the second section to the first section.
  • the transport direction is thus not aligned from the first section to the second section, but vice versa.
  • Such a direction of transport in the "opposite direction" makes it possible to dry the product last with fresh air supplied, which is particularly advantageous if the product is to be dried with particularly clean air in the meantime To make the second supply air small, it is particularly advantageous to dispense with this heater.
  • a control device is preferably provided by means of which the moisture in the exhaust air is to be measured and an air duct in the exhaust air return device is to be regulated.
  • a control device or controller evaluates inputs of the gel founded and regulates or controls by means of a logic of the control device whose outputs.
  • inputs are used here electrical signals from sensors of different types, such as a temperature sensor or a
  • the outputs are usually switches or electrical signals, for example, to control the heater.
  • the control device is advantageous to adapt the air duct, in particular by means of ventilation, in the exhaust air return device to the respective prevailing relative humidity of the exhaust air.
  • a method according to the invention for operating a continuous dryer for drying a product by means of hot air with a first and a second section, which are successively passed by the material in a transport direction and are largely separated in terms of airflow, is designed with the steps of supplying fresh air as the first supply air into the first section, as well as discharge of exhaust air from the second section, and returning exhaust air as a second supply air back into the second section and the transfer of waste heat of the exhaust air into the fresh air.
  • a continuous dryer for drying a product by means of warm air with a first and a second section, which are passed through by the good in a transport direction and largely airflow moderately separated, wherein an air supply means for supplying fresh air to the second section , an exhaust return means are provided for returning exhaust air from the second section into the first section as supply air and an exhaust air discharge means for discharging exhaust air from the first section.
  • the air supply device is designed with a heat exchanger through which the fresh air and the exhaust air are guided out of the first section.
  • an air supply device which supplies fresh heat taken from the environment, as a rule dry, to a heat exchanger.
  • the heat exchanger is on the one hand flows through fresh air, on the other hand, by the heat exchanger before promoted at least two sections recycled exhaust air of the continuous dryer.
  • the thus recirculated exhaust air has a high moisture content. It cools at the heat exchanger and the water contained in it falls out.
  • the two air streams according to the invention are separated from each other, in particular at the heat exchanger by means of a separating surface.
  • On the separation surface then flows on one side of the exhaust air and on the other side the fresh air over.
  • the heat exchanger transfers a thermal energy or heat from the exhaust air to the fresh air. Heat energy is transferred from the exhaust air to the fresh air.
  • the fresh air is heated by means of the waste heat of the exhaust air.
  • the relative humidity of the fresh air decreases as a result of the heating, the fresh air becomes more "dry".
  • the fresh air is at the same time separated by moisture technology. The moisture or liquid in the exhaust air can therefore not pass to the fresh air.
  • the air supply device is preferably designed so that the exhaust air is led out of the first section from the continuous dryer as exhaust air. From the continuous dryer is so in only one place fresh air in the
  • the continuous dryer can be so advantageously equipped with only a single heat exchanger through which both fresh air and exhaust air of the continuous dryer are performed.
  • the air supply device is designed with a first heater for heating the supply air before it is fed into the first section.
  • a heater uses energy to heat the air flowing through it.
  • the heater is, for example, an electric heater, a heating burner or a heating coil through which heating fluid flows.
  • the relative humidity of this air decreases.
  • a low humidity is when drying advantageous since then especially such heated fresh air can absorb more moisture or water.
  • the heated supply air is fed to the second section, that is to say preferably to a rear section in the transport direction or to a section arranged further back, than the first section.
  • the relative humidity of the material to be dried, based on its conveying direction is comparatively low. Therefore, it is particularly advantageous if the water absorption capacity of the fresh air supplied in this section is particularly high.
  • the exhaust air return device is preferably designed with a second heater which serves to heat the supply air before it is fed into the second section.
  • the supply air is heated further before being fed into the second section. It is thus possible in the second section to reduce the relative humidity of the material dried there particularly strongly.
  • a supply air sensor is further provided by means of which in the air upstream or upstream of the heater whose moisture is to be determined.
  • the supply air sensor determines the relative humidity of the inflowing supply air. It is thus advantageous to determine with which relative humidity the supply air flows into the respective section. It is thus also particularly advantageous to determine whether and by how many degrees Celsius the supply air is additionally to be heated by means of a heater in order to achieve a desired relative humidity in the supply air.
  • the exhaust air return device is furthermore designed with a fan for the controlled return of air through the exhaust air return device.
  • the fan draws in particular from its assigned section of air and returns this air to the following section.
  • a fan is provided at or at the exhaust air return device, since this causes a particularly uniform distribution of the air delivery through the respective sections.
  • the first section is subdivided into at least two regions, to each of which an exhaust air return device for returning exhaust air from the upstream region to the respectively downstream region is assigned. The areas thereby form an airflow-like subdivision of the first section.
  • This subdivision or separation causes the individual areas to have different temperatures and moistures on their part.
  • the areas are at the same time fluidly connected to one another by means of an exhaust air return device.
  • the regions thus form a kind of "series connection" in which the exhaust air from the previous region is returned to the respective downstream region its performance and size easily scalable.
  • the transport direction of the conveyor belt is advantageously designed either from the first section to the second section or from the second section to the first section.
  • a transport direction of the conveyor belt from the first section to the second section causes damp or wet material from the first section is pre-dried by means of the exhaust air of the second section. Subsequently, the pre-dried material is dried in the second section by means of the supplied fresh air.
  • This transport direction is particularly advantageous when the material is to be dried as much as possible at the end of its transport path through the continuous dryer according to the invention.
  • the transport direction of the conveyor belt is guided from the second section to the first section. This transport direction is particularly advantageous if it is necessary to remove a great deal of moisture during predrying.
  • a control device is provided by means of which the exhaust air return device is to be regulated.
  • a control device evaluates inputs and regulates or controls outputs by means of a logic.
  • inputs are usually electrical signals from sensors of different types, such as a temperature sensor or a humidity sensor.
  • the outputs are usually switches or electrical signals, for example, to control the preferred heater or fan.
  • the control device is advantageous to regulate the respective heater in the exhaust air return device adapted to the respective sensor signal.
  • the respective fan can be controlled by means of the control device on the basis of the sensor signal.
  • a further method according to the invention for operating a continuous dryer for drying a product by means of hot air with a first and a second section, which are successively passed by the material in a transport direction and are largely separated in terms of air flow is designed with the following steps: supplying fresh air as supply air into the second section, discharging exhaust air from the second section, supplying exhaust air as the first supply air into the first section, and discharging exhaust air from the first section.
  • the heat energy of the exhaust air is transferred to the fresh air by means of a heat exchanger.
  • FIGS Fig. 3 is a greatly simplified longitudinal section of a continuous dryer according to the invention, which is equipped with a control device, and
  • Fig. 6 is a greatly simplified longitudinal section of another invention
  • FIG. 7 shows a continuous dryer according to FIG. 6, which is equipped with a control device.
  • FIGS. 1 to 3 a continuous dryer 10 in the form of a belt dryer is shown.
  • the continuous-flow dryer 10 has a housing 12, through which initially wet or wet material 14 is to be transported by means of a belt 16 in a transport direction 18 through the through-drier 10.
  • the material 14 passes through during transport a first section 20 and a second section 22.
  • the two sections 20 and 22 divide the housing 12 spatially.
  • Warm air 24, which extracts moisture (not shown) from the material 14 to be dried, is also located inside the housing 12. With the removal of moisture from the estate 14, the good 14 is drier, it is dried.
  • Figs. 2 and 3 illustrate how the hot air 24 is generated in the local embodiments. It flows to fresh air 26 from outside the housing 12, promoted by a Frisch povertyzu slaughterblatt slaughter 28, in the housing 12.
  • the fresh air 26 flows through a first heater 30.
  • the first heater 30 heats the fresh air 26 on its way through the heater 30. With the Heating the fresh air 26 decreases the relative humidity of the fresh air 26, the fresh air 26 is "dry”.
  • This fresh air 26 is referred to after heating as the first supply air 32.
  • the first supply air 32 flows into the first sector 20 and flows there around the individual particles of the material 14 or flows through the layer of goods 14 on the belt 16. In this flow around the particles of the goods 14, the first supply air 32 takes moisture from the estate 14th on.
  • the humidified supply air 32 is subsequently removed from the housing 12 into the environment from the first section 20 as the first exhaust air 34.
  • This exhaust air thus constitutes exhaust air
  • the second section 22 is in turn subdivided into two sections 36, 38.
  • the two sections 36, 38 are connected in series and largely separated from each other in terms of airflow second section 22 in more than two areas 36, 38, in particular three, four or five areas to be divided.
  • a second exhaust air 40 is discharged at both regions 36, 38 and in each case a second supply air 42 is supplied.
  • the second exhaust air 40 is returned by means of a return air return device 44 to a part directly as a second supply air 42 in the respective area.
  • a second heater 46 is provided in each case.
  • the second heater 46 heats the second supply air 42, whereby the relative humidity of the second supply air 42 decreases.
  • the exhaust air return device 44 comprises a return line 48 through which the exhaust air 40 also flows. This return line 48 has a branch 50 and a feed 52. At the branch 50, part of the exhaust air 40 is branched off from the return line 48 and guided by means of a line 54 into a collecting line 56.
  • the manifold 56 in FIG. 3, or the conduit 54, in FIG. 2, preferably includes a controlled fan 57.
  • the manifold 56 collects those branched from the first and second regions 36, 38 Exhaust air 40 and passes this exhaust air 40 to a heat exchanger 58.
  • the heat exchanger 58 is arranged at the fresh air supply 28 in front of the first heater 30. Through the heat exchanger 58 through the exhaust air 40 flows and at the same time flows through this heat exchanger 58, the fresh air 26 therethrough.
  • the exhaust air 40 and the fresh air 26 are so separated there by means of a separating surface 60 shown symbolically in FIGS. 2 and 3. About this separation surface 60 exchange the exhaust air 40 and the fresh air 26 heat or thermal energy.
  • waste heat 62 Since the exhaust air 40 is usually warmer than the fresh air 26, the fresh air 26 is usually heated by means of the heat from the exhaust air 40.
  • the emitted heat of the exhaust air 40 is referred to here as waste heat 62.
  • the discharge of the waste heat 62 causes the exhaust air 40 to cool. How much waste heat 62 the exhaust air 40 discharges when passing through the heat exchanger 58 depends on the area and the heat permeability or the heat transfer coefficient of the material of the separating surface 60.
  • the area and the heat permeability of the separating surface 60 are chosen in the embodiments of FIGS. 2 and 3 so that the air flowing through 40 is dehumidified at the same time. This means that at the separation surface 60, the exhaust air 40 cools so far that there prevails a relative humidity of 100% (in words: one hundred percent). At the separating surface 60, water 64 or moisture then falls out of the exhaust air 40. With the precipitation of water 64 at the separating surface 60, the water 64 of the exhaust air 40 is withdrawn, the exhaust air 40 is dryer.
  • the supply line 66 divides into two lines 68.
  • the supply line 66, shown in FIG. 3, or the line 68, shown in FIG. 2, may advantageously comprise a fan 69. This fan 69 is adjustable in terms of its speed in this embodiment and acts suction.
  • the lines 68 connect the supply line 66 to the feed line 52 of the respective region 36, 38 in a flow-conducting manner. The exhaust air 40 is thus fed into the return line 48 by means of the feed 52.
  • the continuous dryer 10 comprises a control device 70.
  • the control device 70 is operatively coupled to a plurality of exhaust air sensors 72 and to a plurality of supply air sensors 74.
  • the individual exhaust air sensor 72 measures in the exhaust air 40 from the second section 22 per region 36, 38, the relative humidity. Depending on the relative humidity of the exhaust air 40, the control device 70 then regulates the distribution of the exhaust air 40 at the branch 50. Is the relative humidity of the exhaust air 40 in the range of 90 to 100% (in words: ninety to one hundred percent), in particular 95 to 100 % (in words ninety-five to one hundred percent), exhaust air 40 is increasingly directed to the heat exchanger 58 and dehumidified at the heat exchanger 58.
  • the individual supply air sensor 74 measures in the supply air 42 to the respective region 36, 38 of the second section 22, the relative humidity in the flow direction after the supply 52 and before the second heater 46. Depending on the relative humidity of the supply air 42, the controller 70 controls the Adding the exhaust air 40 to the feed 52. In an alternative embodiment, not shown, the exhaust air sensor 72 and the supply air sensor 74 may additionally measure the temperature prevailing there.
  • the continuous dryer 1 10 comprises a housing 1 12 through which moist or wet material 1 14 is first to be transported in a transport direction 1 18 by means of a conveyor belt 1 16.
  • the Good 1 14 passes through in this transport successively first a first section 120 and then a second section 122, which subdivide the housing 1 12 spatially.
  • Warm air 124 is located in each of the sections 120, 122 within the housing 12.
  • the respective warm air 124 of the individual sections 120, 122 is largely separated in terms of airflow.
  • the warm air 124 withdraws in each of the sections 20, 122 the goods 1 14 transported therein moisture or liquid 126, in particular water.
  • the removal of liquid 126 from the Good 1 14 dehumidifies the Good 1 14.
  • the Good 1 14 is dry or dried.
  • FIGS. 5 to 7 show the air guidance according to the invention of the hot air 124 in the sections 120 and 122.
  • the hot air 124 for the second section 122 is generated in an air feed device 128 by means of a heat exchanger 130 and a heater 132.
  • the heat exchanger 130 and the heater 132 thereby heat fresh air 134 from the environment and introduce it into the second section 122.
  • an exhaust air recirculation device 136 recirculates "used" fresh air 134 as exhaust air 138 from the second section 122 into the first section 120 as supply air 140.
  • the exhaust air 138 from the second section 122 thus serves to flow through the exhaust air recirculation device 136 as supply air 140 for the first section 120.
  • This supply air 140 is further moistened in the first section 120 of the goods 1 14 located therein and then mit- Tels a Abluftab adoptedeinnchtung 142 discharged from the first section 120 and discharged as exhaust air 144 to the environment of the continuous dryer 1 10.
  • the exhaust air 138 is conveyed to the heat exchanger 130 of the air supply device 128 by means of the exhaust air discharge device 142.
  • the exhaust air 138 is after passing through the heat exchanger exhaust air 144th
  • the heat exchanger 130 of the air supply device 128 is at the same time flowed through by the exhaust air 38 and the fresh air 134.
  • the exhaust air 138 and the fresh air 134 are fluidly separated by means of an exchange surface 148 or separation surface. This exchange surface 148 transmits the heat energy 146 of the exhaust air 138 to the fresh air 134.
  • the named heater 132 is arranged downstream of the heat exchanger 130 in the flow direction of the fresh air 134, before the fresh air 134 then enters the second section 122 flows.
  • the fresh air 134 takes up the liquid contained in the 126 1 126.
  • the fresh air 134 is enriched with water or "moist".
  • the exhaust return means 136 comprises a fan 150 and a heater 152.
  • the fan 50 sucks the exhaust 138 from the second section 122 and guides it through the heater 152 into the first section 120.
  • the heater 152 heats the exhaust air 138. With the heating, it sinks
  • the first exhaust air 138 thereby becomes the supply air 140.
  • the supply air 140 flows through the first section 120 and likewise absorbs liquid 126.
  • FIG. 6 and FIG. 7 show an embodiment of a continuous dryer 110 in which the first section 120 is subdivided into a first region 154, a second region 156 and a third region 158.
  • the second and third regions 156, 158 are intermediate links between the second section 122 and the first region 154.
  • the regions 154, 156, 158 form a "series connection.”
  • the region following in the direction of transport 1 18 becomes The supply air 140 flows through the respective region 156, 158.
  • this "used" supply air 140 is used as exhaust air 138 by means of an exhaust air return device 136 in the transport direction 1 18 in the respectively preceding regions 154, 156 recycled.
  • These exhaust air return devices 136 also each comprise a fan 150 and a heater 152.
  • the fan 150 transports the exhaust air 38 and the heater 152 heats it.
  • the air supply device 128 and the exhaust return device 136 are each provided with a supply air sensor 160 provided downstream of the respective heaters 132 and 152.
  • the supply air sensors 160 and the heaters 132 and 152 are operatively coupled to a controller 162, such as a conventional programmable logic controller (PLC).
  • PLC programmable logic controller
  • the controller 162 is operably coupled to the heaters 132, 152 and additionally or alternatively to the fans 150.
  • the control device 162 thus regulates, by means of the signals detected by the supply air sensors 160, the respective heaters 132 and 152.
  • the respective fans 150 are additionally or alternatively regulated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un sécheur continu destiné à sécher un produit (14) avec de l'air chaud. Le sécheur continu comprend des première et seconde sections (20, 22) qui sont traversées successivement par le produit (14) dans un sens de transport et qui sont séparées en grande partie quant à l'écoulement de l'air. L'invention est caractérisée en ce qu'un dispositif d'alimentation en air frais (28) est prévu pour amener de l'air frais (26) en tant que premier afflux d'air dans la première section (20), un dispositif de recirculation d'air sortant (44) destiné à évacuer l'air sortant (40) de la seconde section (22) et pour remettre en circulation l'air sortant (40) en tant que second afflux air (42) dans la seconde section (22) et un échangeur de chaleur (58) est prévu qui est traversé d'une part par l'air frais (26) et d'autre part par l'air sortant (40) pour transférer la chaleur dégagée (62) de l'air sortant (40) à l'air frais (26).
EP17707754.2A 2016-02-01 2017-02-01 Sécheur continu comportant au moins deux sections Pending EP3411646A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016101725.6A DE102016101725A1 (de) 2016-02-01 2016-02-01 Durchlauftrockner mit mindestens zwei Sektionen
DE102016103685.4A DE102016103685C5 (de) 2016-03-01 2016-03-01 Durchlauftrockner mit mindestens zwei Sektionen
PCT/DE2017/100064 WO2017133727A1 (fr) 2016-02-01 2017-02-01 Sécheur continu comportant au moins deux sections

Publications (1)

Publication Number Publication Date
EP3411646A1 true EP3411646A1 (fr) 2018-12-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17707754.2A Pending EP3411646A1 (fr) 2016-02-01 2017-02-01 Sécheur continu comportant au moins deux sections

Country Status (4)

Country Link
US (1) US20190041134A1 (fr)
EP (1) EP3411646A1 (fr)
CA (1) CA3013083C (fr)
WO (1) WO2017133727A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017108697A1 (de) 2017-04-24 2018-10-25 Stela Laxhuber Gmbh Durchlauftrockner mit einer Abluftrückführeinrichtung
DE102017108695A1 (de) * 2017-04-24 2018-10-25 Stela Laxhuber Gmbh Durchlauftrockner mit einer ersten und einer zweiten Sektion
FI20195719A1 (en) * 2019-08-30 2021-03-01 Sikkum Global Oy Drying capsule, drying system and method for drying structures
DE102020213945A1 (de) * 2020-11-05 2022-05-05 Volkswagen Aktiengesellschaft Vorrichtung und Verfahren zum Trocknen eines Werkstücks mit kaskadierender Wärmezufuhr
WO2024089168A1 (fr) * 2022-10-27 2024-05-02 Weiss Technik Gmbh Système de séchage et procédé de séchage d'un produit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE506267C (de) * 1927-02-09 1930-09-01 Werner Brunnschweiler Kanalstufentrockner
US2722752A (en) * 1953-05-04 1955-11-08 Morch Arne Soren Drying plants for wooden sheet material
GB1362759A (en) * 1971-05-28 1974-08-07 Brueckner Apparatebau Gmbh Apparatus for textile treatment
DE4235422C2 (de) * 1992-10-21 1997-01-23 Dornier Gmbh Lindauer Verfahren zum Trocknen von vorzugsweise in pelletierter Form vorliegenden pastösen Material, insbesondere Klärschlamm und Vorrichtung zur Durchführung des Verfahrens
US7581334B2 (en) * 2003-09-04 2009-09-01 Fujifilm Corporation Drying apparatus
AT510007B1 (de) * 2010-12-07 2012-01-15 Muehlboeck Kurt Verfahren zur holztrocknung
DE102013206268B3 (de) * 2013-04-10 2014-05-22 Kba-Metalprint Gmbh Bandtrockner mit einem Trocknungsraum
AT515466B1 (de) * 2014-02-26 2016-05-15 Mühlböck Kurt Verfahren zur Trocknung von Schüttgut

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Publication number Publication date
WO2017133727A1 (fr) 2017-08-10
CA3013083C (fr) 2024-05-28
CA3013083A1 (fr) 2017-08-10
US20190041134A1 (en) 2019-02-07

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