EP3350525A2 - Sécheur à bande et procédé de déshumidification de microalgues - Google Patents

Sécheur à bande et procédé de déshumidification de microalgues

Info

Publication number
EP3350525A2
EP3350525A2 EP16770870.0A EP16770870A EP3350525A2 EP 3350525 A2 EP3350525 A2 EP 3350525A2 EP 16770870 A EP16770870 A EP 16770870A EP 3350525 A2 EP3350525 A2 EP 3350525A2
Authority
EP
European Patent Office
Prior art keywords
biomass
conveyor belt
drying
algae
less
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16770870.0A
Other languages
German (de)
English (en)
Inventor
Franz Emminger
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.)
Beco Invest BV
Original Assignee
Ecoduna AG
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 Ecoduna AG filed Critical Ecoduna AG
Publication of EP3350525A2 publication Critical patent/EP3350525A2/fr
Withdrawn legal-status Critical Current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
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • 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 propelling the materials over stationary surfaces
    • F26B17/023—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 propelling the materials over stationary surfaces the material being a slurry or paste, which adheres to a moving belt-like endless conveyor for drying thereon, from which it may be removed in dried state, e.g. by scrapers, brushes or vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00—Arrangements for controlling solar heat collectors
    • F24S50/20—Arrangements for controlling solar heat collectors for tracking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/50—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S90/00—Solar heat systems not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/20—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all vertical or steeply inclined
    • F26B15/22—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all vertical or steeply inclined the objects or batches of materials being carried by endless belts the objects or batches of material being carried by trays or holders supported by endless belts or chains
    • 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 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 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
    • 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 propelling the materials over stationary surfaces
    • F26B17/06—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 propelling the materials over stationary surfaces the belts being all vertical or steeply inclined
    • 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
    • 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
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • F26B3/286—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection by solar radiation
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G33/00—Cultivation of seaweed or algae
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying goods
    • F26B2200/16—Sea weed; Marine products
    • 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
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
    • Y02B40/18—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers using renewables, e.g. solar cooking stoves, furnaces or solar heating
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/47—Mountings or tracking

Definitions

  • the invention relates to a method for obtaining dehumidified biomass of algae and / or microorganisms, for example after a harvesting process of the algae and / or
  • Microorganisms from a suspension consisting of nutrient solution in particular in a breeding and production or hydroculturing. Furthermore, the invention also relates to a device for carrying out the method and to a container with dehydrated biomass obtainable by the method.
  • Algae (especially microalgae belonging to the phototrophic microorganisms) are mainly cultivated because of their valuable ingredients, e.g. in the production of
  • ingredients include, among others, unsaturated fatty acids (e.g., omega-3 and omega-6 fatty acids), antioxidants such as astaxanthin and lutein, and chlorophyll.
  • unsaturated fatty acids e.g., omega-3 and omega-6 fatty acids
  • antioxidants such as astaxanthin and lutein
  • chlorophyll e.g., astaxanthin and lutein
  • the composition of the ingredients depends on the cultivated nature of phototrophic, mixotrophic or heterotrophic microorganisms. Predominantly, a pure culture of phototrophic, mixotrophic or heterotrophic microorganisms is used to achieve a certain quality or minimum concentration of the desired
  • the microorganisms operating the photosynthesis are cultured under the action of light (eg sunlight and / or artificial light) in the nutrient-containing culture medium in a photobioreactor, and then concentrated ("harvested") and dehumidified or dried be obtained or the biomass itself can be used as food, feed or fertilizer.
  • light eg sunlight and / or artificial light
  • Methods and systems for drying crops are known in many variations and preferably adapted to the crop.
  • the screen belt is acted upon from above with supplied dry air and the exhaust air occurring during the drying process is sucked off below the screen belt via a suction fan.
  • a suction fan To clean the exhaust air are dust filter and filter elements below the
  • EP 2 848 883 A1 still a belt drying plant with a conveyor belt for drying dry material, such as sawdust, known.
  • DE 2911318 A1 discloses a method and a device for drying agricultural and horticultural good.
  • JP 3868476 B1 describes a plant and a process for the continuous drying of sawdust and other raw materials.
  • DE 102009001024 A1 relates to a method for drying moist material and an associated drying room.
  • US 2014/182158 A1 describes a
  • the RU 2022219 C1 describes a drying apparatus having a horizontally tiltable and vibratable drying chamber with a transparent roof.
  • JP 2013-117333 A (D6) describes a multi-stage belt dryer for pasty materials (e.g., food).
  • the object of the invention is to provide a method of the initially cited type which on the one hand avoids disadvantages of the known methods and devices and which is as suitable as possible for drying biomass of algae and / or microorganisms in a continuous, efficient and economical harvesting process.
  • the method according to the invention is characterized in that the concentrated biomass, preferably by the harvesting process, which is a concentrated algae or microorganism suspension, is present on a preferably endless,
  • Transport belt is distributed that the distributed on the conveyor belt biomass is exposed to heated air, wherein the heating of the air via the sun and / or an air heater in a closed system that the drying process is carried out until a residual moisture is reached, the dehumidified biomass on drying end
  • this biomass adheres to the conveyor belt and that this (optionally powdered and / or flake-like form of) biomass is separated via a Abschaboder Abkratzkante from the conveyor belt and, preferably after further drying (in other words: post-drying ) is collected in a collecting container.
  • This biomass is preferably present in powdery and / or flake form, in particular even before the further drying (if it is carried out) or in the collecting container.
  • the discovery in the course of the present invention enables biomass of algae and / or microorganisms to be (in particular) dried to a flake-like shape (although the biomass adheres to the conveyor belt in the dehumidified state), that when the conveyor belt is circulated , the conveyor belt is almost the entire length (ie even if the biomass-leading surface facing down and non-adherent biomass would fall from the conveyor belt) is used for the drying process.
  • Conveyor belt (or the surface of the conveyor belt to which the biomass adheres) on at least part of the transport path down, the surface along the transport direction may be inclined to the horizontal (ie not parallel to the Horizontal), preferably over a transport length of at least 0.5 meters, preferably at least 1 meter, more preferably at least 2 meters, in particular at least 2.5 meters.
  • the conveyor belt in particular in or with a translucent envelope, or its longitudinal axis, arranged at an arbitrary angle to the horizontal.
  • the angle is expediently more than 5 °, preferably more than 10 °, more preferably more than 20 °, even more preferably more than 30 ° or even more than 40 °, in particular more than 50 ° or even more than 60 °.
  • the conveyor belt can be adapted to the position of the sun when it is dried with the help of sunlight. For the expert is
  • the transport path over which the conveyor belt is guided in this Wnkel to the horizontal at least 0.5 meters, preferably at least 1 meter, more preferably at least 2 meters, in particular at least 2.5 meters.
  • the biomass adheres to the conveyor belt, steep angle or long transport distances can be made possible at this angle.
  • the layer thickness of the distributed on the conveyor belt concentrated algae or microorganism suspension (ie at the beginning of the drying process) on average between 0.2 mm and 2 mm, preferably between 0.3 mm and 1, 9 mm or even between 0.4 mm and 1, 8 mm, more preferably between 0.5 mm and 1, 7 mm or even between 0.6 mm and 1, 5 mm, in particular between 0.75 mm and 1, 25 mm or even substantially at 1 mm.
  • the conveyor belt or a counter-roller operatively connected to the conveyor belt at least partially in the concentrated biomass, which as concentrated algae or
  • Microorganism suspension is present, immersed to the biomass on the conveyor belt to distribute.
  • pumps in combination with sealing lips, which form a front-surface reservoir can be used to prevent the back of the conveyor belt being wetted (which may lead to impurities that are difficult to remove can).
  • the surface has an arithmetic mean roughness Ra of more than 0, 1 ⁇ , preferably more than ⁇ , ⁇ or even more than 1 ⁇ , more preferably more than 2 ⁇ or even more than 3 ⁇ , even more preferably more than 5 ⁇ or even more than 10 ⁇ , in particular more than 15 ⁇ or even more than 20 ⁇ on.
  • Ra is determined according to the standard DIN EN ISO 4287: 2010-07.
  • the surface has
  • a contact angle to water of at most 90 °, preferably at most 87.5 °, more preferably at most 85 °, even more preferably at most 82.5 °, in particular at most 80 ° or even at most 75 °.
  • the determination of the contact angle of the surface to water can be carried out by methods known to the person skilled in the art, for example in accordance with the standard DIN 55660-2: 201 1-12, using commercially available measuring devices for determining the contact angle, for example the one from Krüss (Hamburg, DE) available contact angle measuring systems.
  • Elastomers in particular rubber such as nitrile rubber, have proven to be materials which are particularly suitable for application or adhesion. Therefore, in a preferred embodiment, said surface of the conveyor belt consists of a
  • Elastomer preferably of a rubber, in particular of a nitrile rubber.
  • Concentration of algae or microorganisms (before application to the conveyor belt) between 10 g / L and 1000 g / L, preferably between 50 g / L and 750 g / L, even more preferably between 75 g / L and 400 g / L, in particular between 100 g / L and 200 g / L.
  • the residual moisture content of the biomass is less than 50%, preferably less than 40%, more preferably less than 30%, even more preferably less than 27.5%, in particular less than 25%, in particular directly before it Scraping or scraping edge hits.
  • the residual moisture content of the biomass is preferably more than 5%, preferably more than 10%, more preferably more than 15%, even more preferably more than 17.5%, in particular more than 20%, in particular for the production of the flake-like form
  • the further drying can be accomplished by any further drying process, preferably a convection drying process, in particular a belt drying process.
  • a residual moisture content of the biomass of less than 10%, preferably less than 5%, achieved. It is particularly useful (especially with regard to the quality of the final product) if this
  • Drying process the drying of the biomass at 20 ° C to 70 ° C, preferably at 30 ° C to 60 ° C, in particular at 40 ° C to 50 ° C is performed.
  • the drying time in this drying process is between 0.5 minutes and 20 minutes, preferably between 1 and 10 minutes, in particular between 2 and 8 minutes.
  • This further drying step may (in particular as
  • Convection drying step on a collection belt that leads the dehumidified biomass to the catch tank.
  • the inventive method has proven to be particularly suitable for algae, the
  • Microorganisms are (it is also called “microalgae”) proven.
  • the method according to the invention leads to better results with microalgae, the larger the individual cells are or the closer the cell shape resembles a spherical shape. Therefore, in a preferred embodiment, the algae to be dried are selected from microalgae having a coccal or spherical cell shape. During the numerous experiments in the course of the present invention, it has been found that the method according to the invention is suitable for algae having a smaller cell diameter, such as e.g.
  • Nannochloropsis is suitable, but among other things, the order or the replacement by the scraping or Abkratzkante works better for larger cell diameter. Therefore, the use of (especially spherical or coccal) microalgae with a
  • algae selected from the order of chlorellales preferably the family Chlorellaceae, more preferably the genus Auxenochlorella or Chlorella, in particular Chlorella vulgaris and the order of the Volvocales, preferably of the family Haematococcaceae, more preferably the genus Haematococcus, in particular Haematococcus pluvialis and the order of the Eustigmatales (but preferably without Nannochloropsis, for the reasons given above), preferably the families of the Loboceae, Chlorobothryaceae, Pseudocharaciopsidaceae and
  • the invention it is also possible to dry the freshly harvested and concentrated biomass, in particular the concentrated algae or microorganism suspension, ideally immediately after harvest, maintaining a very high quality and a degradation of the biomass and its ingredients is prevented, which is of great importance.
  • algae are produced in sun-favorable locations, so it is the trend of sustainability and environmental awareness that exist
  • the distribution of the concentrated biomass takes place continuously on the conveyor belt and / or the heating of the biomass on the conveyor belt and / or the separation of the biomass from the conveyor belt.
  • the previously connected production process as well as the harvesting process and the concentration of biomass are predominantly continuous.
  • the continuous drying prevents storage of large quantities of moist biomass and avoids as far as possible an undesirable oxidation process and spoilage of the biomass.
  • the drying of the biomass (on the conveyor belt) at 20 ° C to 70 ° C, preferably at 30 ° C to 60 ° C, in particular at 40 to 50 ° C.
  • the desired temperature bandwidth is limited to a maximum desired temperature for maximum efficiency
  • the drying time in this drying process is between 0.5 minutes and 20 minutes, preferably between 1 and 10 minutes, in particular between 2 and 8 minutes.
  • the air coming into contact with the biomass on the conveyor belt (which can be guided in cocurrent or countercurrent to the conveyor belt) is preferably circulated closed and / or dehumidified.
  • the air surrounding the conveyor belt is heated to dry the biomass directly on the sun and optionally indirectly via, provided in the closed system, reflection surfaces.
  • the efficiency of the system is increased by the fact that on the side facing away from the sun by reflectors an energy input into the biomass or to the collector tubes is achieved.
  • the biomass to be dried on in particular arranged in a Wnkel, conveyor belt first promoted from bottom to top, and preferably exposed to direct sunlight, and conveyed after deflection of the conveyor belt to be dried biomass on the conveyor belt from top to bottom and preferably exposed to indirect sunlight.
  • the value of direct and indirect radiation is adjusted to the sun's position to optimize the energy input.
  • the moisture content and / or the temperature of the air and / or biomass are used for process monitoring and the delivery of data for process control and process optimization.
  • the present invention relates to a container with dehumidified biomass of algae and / or microorganisms, wherein the biomass by the
  • the container is for example a barrel or a box, the container may e.g. be labeled or marked with a filling date or expiry date (depending on the residual moisture).
  • this container is a closed container.
  • flakes are particularly well suited for supercritical fluid extraction, e.g. suitable for use with carbon dioxide because the efficiency of extracting biomass ingredients over algae / microorganism biomass forms known in the art, e.g. spray-dried powder is increased.
  • the dehumidified biomass (especially when in the form of flakes) has not undergone a drum-drying or drum-drying step, or has not been post-dried in a drum or drum dryer. These two methods are usually detrimental to the quality of the ingredients (e.g., by the high temperatures employed).
  • the said flakes have on average an average thickness of 0.1 to 2 mm, preferably of 0.2 mm to 1.5 mm, more preferably of 0.3 mm to 1 , 0 mm, even more preferably from 0.4 mm to 0.9 mm, in particular from 0.5 mm to 0.8 mm, and / or when the said flakes have on average, along their longest dimension, an extension which exceeds 1 cm, preferably more than 2 cm, more preferably more than 3 cm, even more preferably more than 4 cm, in particular more than 5 cm and / or less than 100 cm, preferably less than 75 cm, more preferably less than 50 cm, even more preferably less than 40 cm, in particular less than 30 cm or even less than 20 cm.
  • said flakes (in particular after final drying) have a residual moisture content of less than 10%, preferably less than 5%.
  • said biomass is a biomass of algae which are microorganisms.
  • the algae are selected from microalgae having a coccal or spherical cell shape.
  • the method according to the invention is suitable for algae having a smaller cell diameter, such as e.g.
  • Nannochloropsis is suitable, but among other things, the order or the replacement by the scraping or Abkratzkante works better for larger cell diameter.
  • coccal microalgae having an average cell diameter of more than 3 ⁇ , preferably more than 4 ⁇ or even more than 5 ⁇ , more preferably more than 6 ⁇ or even more than 7 ⁇ , even more preferably more than 8 ⁇ or even more than 9 ⁇ , in particular of more than 10 ⁇ also in the container according to the invention
  • algae selected from the order of Chlorellales, preferably the family of Chlorellaceae, more preferably the genus Auxenochlorella or Chlorella, especially Chlorella vulgaris, and the order of Volvocales, preferably the family of Haematococcaceae, more preferably the genus Haematococcus, in particular Haematococcus pluvialis and the order of the Eustigmatales (but preferably without Nannochloropsis, for the reasons given above), preferably the families of Loboceae, Chlorobothryaceae, Pseudocharaciopsidaceae and Eustigmataceae.
  • Another object of the invention is to provide a device with which the
  • This object of the invention is achieved by a device for carrying out the method for obtaining dehumidified biomass.
  • the inventive device is characterized in that a conveyor belt, in particular an endless conveyor belt, is provided for receiving the biomass that this conveyor belt is surrounded by a translucent envelope, such as a tube or a channel-like envelope structure to a closed system that Conveyor belt with the envelope (or its longitudinal axis) is arranged at an arbitrary angle to the horizontal and that this conveyor belt with the envelope is rotatable, preferably on a turnstile, is arranged.
  • a further envelope between the conveyor belt and the aforementioned envelope namely an opaque (preferably dark or black) envelope, which is also the
  • Enclosed conveyor belt and includes a gas space in direct contact with the
  • Conveyor belt is.
  • the two are
  • Enclosures are formed as concentric tubes, in particular wherein the air between the translucent and opaque enclosures for thermal insulation of the air within the opaque enclosure (which air in direct contact with the
  • Conveyor belt is) serves.
  • the angle is expediently more than 5 °, preferably more than 10 °, more preferably more than 20 °, even more preferably more than 30 ° or even more than 40 °, in particular more than 50 ° or even more than 60 °.
  • the transport path over which the conveyor belt is guided at this angle to the horizontal at least 0.5 meters, preferably at least 1 meter, more preferably at least 2 meters, in particular at least 2.5 meters.
  • the conveyor belt or an opposing roller operatively connected to the conveyor belt is at least partially submerged in a feed, wherein the feed is preferably provided as an open container for the concentrated biomass, which is present as a concentrated algae or microorganism suspension.
  • the conveyor belt with the envelope with a reflection surface preferably a mirror, in particular a flat or
  • Parabolic mirror underlaid.
  • a reflection surface as seen from the sun's direction of incidence behind the translucent sheath structure, allows more efficient use of the radiated energy.
  • the translucent envelope made of plastic or glass. Both materials have their special advantages and can be used for specific applications.
  • the conveyor belt is a
  • Adhesive or appendage force establishes an interface layer that spreads formed between the belt and the concentrated suspension with biomass.
  • the main property of adhesion is a mechanical cohesion of involved phases. Such a band has proven to be very suitable for the purpose of transporting the biomass in the experiments.
  • the conveyor belt (or a surface thereof) preferably comprises an elastomer, preferably a rubber, in particular a nitrile rubber and / or is rough or textured and / or hydrophilic (preferably at least two of them, in particular rough, textured and hydrophilic), wherein the Surface an arithmetic center rough Ra of more than 0, 1 ⁇ , preferably more than ⁇ , ⁇ or even more than 1 ⁇ , more preferably more than 2 ⁇ or even more than 3 ⁇ , even more preferably more than 5 ⁇ or even more than 10 ⁇ , especially more than 15 ⁇ or even more than 20 ⁇ .
  • an elastomer preferably a rubber, in particular a nitrile rubber and / or is rough or textured and / or hydrophilic (preferably at least two of them, in particular rough, textured and hydrophilic)
  • the Surface an arithmetic center rough Ra of more than 0, 1 ⁇ , preferably more than ⁇ , ⁇ or even more than 1 ⁇ , more preferably more than 2 ⁇ or even
  • the surface expediently has a contact angle to water of at most 90 °, preferably at most 87.5 °, more preferably at most 85 °, even more preferably at most 82.5 °, in particular at most 80 ° or even at most 75 °.
  • the conveyor belt has at least one deflection of more than 45 °, preferably more than 90 °, even more preferably more than 135 °, in particular substantially 180 ° (see Fig. 1) in the region which is in operation loaded with biomass.
  • the speed of the conveyor belt is adjustable to better control the drying process.
  • the surface of the conveyor belt provided for transporting biomass downwards on at least part of the transport path, wherein the surface along the transport direction may be inclined to the horizontal (ie, does not have to be parallel to the horizontal), preferably over a transport length of at least 0.5 meters, preferably at least 1 meter, more preferably at least 2 meters, in particular at least 2.5 meters.
  • the conveyor belt is operatively connected to a scraping or scraping edge.
  • the distance of this edge to the conveyor belt is adjustable.
  • an air heater is provided for heating the air for drying the biomass in the absence of sunlight.
  • at least one moisture and / or one temperature measuring device is provided at the beginning and / or in the region and / or at the end of the drying section, preferably via sensors. The facilities for measuring
  • Moisture and temperature of both biomass and air are used for process monitoring and quality assurance as well as the supply of data for process control and optimization.
  • the terms “average,” “average,” and “mean” mean both the arithmetic mean and the median, the latter being preferred, by which the term “cell diameter” of a microalgae refers to the diameter the microalgae in the hydrogenated, living state eg during the cultivation. It is known to the person skilled in the art that the diameter of a cell decreases during the drying process.
  • FIG. 1 is a schematic representation of a side view of a device for obtaining dehumidified biomass
  • Fig. 2 is a schematic representation of a plurality of juxtaposed
  • Fig. 3 shows the dehumidified biomass invention in flake form of Chlorella vulgaris at a residual moisture content of about 22.5%
  • Fig. 4 Illustrations of the invention dehumidified biomass in flake form of Chlorella vulgaris at a residual moisture content of less than 5% after the final convection drying step on a conveyor belt.
  • the device for obtaining dehumidified biomass ie the Drying, a conveyor belt 1, in particular an endless conveyor belt, for receiving the biomass.
  • the conveyor belt 1 is a rough, textured band, which with
  • this conveyor belt 1 is surrounded by a translucent envelope 2, for example a tube or a channel-like enveloping structure, to form a closed system.
  • the envelope 2 with the inner conveyor belt 1 is lined with a reflection surface 3, preferably a mirror, in particular a flat or parabolic mirror.
  • the translucent envelope 2 is preferably made
  • the conveyor belt 1 with the enclosure 2 is arranged in a freely selectable Wnkel ⁇ to the horizontal.
  • the size of Wnkels ⁇ is selected according to the state of the sun and the sun, but in this embodiment is in any case over 40 °.
  • the conveyor belt 1 with the envelope 2 is rotatable, preferably on a turnstile 4, arranged.
  • an air heater 5 is provided.
  • a supply 6 is provided for the moist biomass.
  • an accumulation belt 7 is provided for the after-drying and the transport of the dehumidified biomass in a collecting container 8.
  • a scraping or scraping edge 9 is arranged on the back of the conveyor belt 1, that is at the end of the endless conveyor belt 1.
  • Moisture and / or temperature measuring devices are provided at the beginning and / or in the region and / or at the end of the drying section. These meters are preferably sensors.
  • Transport belt 1 arranged with wrapper 2.
  • a feeder 6 is provided for the moist biomass.
  • the collecting belt 7 conveys the dehumidified biomass into the collecting container 8.
  • the method for obtaining dehumidified biomass of algae and / or microorganisms, for example after a harvesting process, will be described below with reference to FIGS. 1 and 2 Algae and / or microorganisms from a suspension consisting of nutrient solution, in particular in a breeding and production or hydroculturing, detailed.
  • the present concentrated biomass of Chlorella vulgaris (concentration: 150 g / L) is distributed via the feed 6 on a, preferably endless, conveyor belt 1.
  • the distributed on the conveyor belt 1 biomass is exposed to heated air, wherein the heating of the air via the sun and / or an air heater 5 takes place in a closed system.
  • the drying process is carried out until a residual moisture content of 22.5% is reached, the dehumidified biomass adhering to the conveyor belt 1 in the form of a flake at the end of drying.
  • the drying of the biomass is carried out at 50 ° C. This flake-like form of the biomass is separated via a scraper or scraping edge 9 from the conveyor belt 1 and collected via the collecting belt 7 in a collecting container 8.
  • the order of the concentrated biomass is carried out continuously on the conveyor belt 1. Likewise, the heating of the biomass on the conveyor belt 1 and / or the separation of the biomass from the conveyor belt 1 are carried out continuously.
  • the conveyor belt 1 is guided according to the position of the sun with the adhering to the conveyor belt 1 biomass.
  • the hub 4 serves this purpose.
  • the air surrounding the conveyor belt 1 is heated directly over the solar irradiation for drying the biomass and indirectly via reflection surfaces 3 provided behind the closed system.
  • the biomass to be dried is first conveyed from bottom to top at a angle (a) of 70 ° conveyor belt 1 and exposed to direct sunlight and after deflection of the conveyor belt to be dried biomass is conveyed on the conveyor belt 1 from top to bottom and the indirect Exposed to sunlight.
  • the moisture and / or the temperature of the air and / or the biomass are measured both when the biomass is distributed on the conveyor belt 1 and / or in the drying section and / or in the region of the collecting container.
  • FIG. 3 shows the dehumidified biomass obtained in accordance with the embodiment of FIG Flake form of Chlorella vulgaris (drying temperature: 50 ° C). The residual moisture is approx. 22.5%. The area indicated by the white dashed rectangle in the upper figure is shown enlarged in the lower figure. The post-drying step is usually performed on the same day or the next day (see next paragraph).
  • Fig. 4 shows the dehumidified biomass of Fig. 3 after the post-drying step

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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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Drying Of Solid Materials (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'obtention de biomasse déshumidifiée d'algues et/ou de micro-organismes. La biomasse concentrée, obtenue par le processus de récolte, est répartie sur une bande transporteuse sans fin (1) et exposée sur la bande transporteuse (1) à de l'air chauffé. Le chauffage de l'air se fait par le soleil et/ou par un réchauffeur à air (5) dans un système fermé, la bande transporteuse (1) étant entourée par une enveloppe (2) laissant passer la lumière. Le processus de séchage est mis en œuvre jusqu'à atteindre une teneur en humidité résiduelle, la biomasse déshumidifiée adhérant à la bande transporteuse (1) à la fin du séchage. Cette biomasse est séparée de la bande transporteuse (1) par un bord de grattage ou de raclage (9) et recueillie dans un récipient collecteur (8).
EP16770870.0A 2015-09-14 2016-09-14 Sécheur à bande et procédé de déshumidification de microalgues Withdrawn EP3350525A2 (fr)

Applications Claiming Priority (2)

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ATA594/2015A AT517667B1 (de) 2015-09-14 2015-09-14 Verfahren zur Gewinnung von entfeuchteter Biomasse
PCT/AT2016/060057 WO2017045003A2 (fr) 2015-09-14 2016-09-14 Sécheur à bande et procédé de déshumidification de microalgues

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CN112358947B (zh) * 2020-11-16 2023-07-21 河西学院 一种用于生产鲜食微藻的管道化装置
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AT517667A1 (de) 2017-03-15
US20190041133A1 (en) 2019-02-07
AU2016324335A1 (en) 2018-04-12
WO2017045003A3 (fr) 2017-06-01
US10488110B2 (en) 2019-11-26
IL258027A (en) 2018-05-31
AT517667B1 (de) 2019-05-15
WO2017045003A2 (fr) 2017-03-23

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