EP2206548B1 - Verfahren und Vorrichtung zum Mischen von Schlamm - Google Patents

Verfahren und Vorrichtung zum Mischen von Schlamm Download PDF

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Publication number
EP2206548B1
EP2206548B1 EP09015822A EP09015822A EP2206548B1 EP 2206548 B1 EP2206548 B1 EP 2206548B1 EP 09015822 A EP09015822 A EP 09015822A EP 09015822 A EP09015822 A EP 09015822A EP 2206548 B1 EP2206548 B1 EP 2206548B1
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EP
European Patent Office
Prior art keywords
air
slurry
air supply
circuits
tank
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Application number
EP09015822A
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English (en)
French (fr)
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EP2206548A1 (de
Inventor
Trevor Linton
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Linton & Robinson Environmental
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Linton & Robinson Environmental
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Priority to PL09015822T priority Critical patent/PL2206548T3/pl
Publication of EP2206548A1 publication Critical patent/EP2206548A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/02—Maintaining the aggregation state of the mixed materials
    • B01F23/023—Preventing sedimentation, conglomeration or agglomeration of solid ingredients during or after mixing by maintaining mixed ingredients in movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2311—Mounting the bubbling devices or the diffusers
    • B01F23/23113—Mounting the bubbling devices or the diffusers characterised by the disposition of the bubbling elements in particular configurations, patterns or arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
    • B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
    • B01F23/237611—Air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2211—Amount of delivered fluid during a period
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/005—Mixing or agitating manure, dung

Definitions

  • This invention relates to a method and apparatus for mixing slurry to prevent the formation of a crust on the slurry and to enhance the nutrient content of the slurry.
  • Slurry from cattle and other animals is a good source of nitrates and thus it is desirable to spread the slurry on land as a fertilizer.
  • environmental legislation is placing increasing limits on when and how slurry can be spread, requiring the storage of increasing volumes of slurry in slurry tanks for increasing lengths of time.
  • the trend to increased herd size in dairy farming has resulted in greater slurry storage requirements.
  • a more reliable and relatively maintenance free method of mixing and aerating the slurry is to place pipes having outlet apertures in the bottom of the tank and to supply compressed air to the pipes whereby air is bubbled through the slurry to mix and aerate the slurry.
  • An example of this is shown in GB 1 568 813 . While this method has been found to be effective, considerable trial and error is required with regard to the number and position of the pipes in the tank and the pressure and flow rate of the air passed into the slurry in order to ensure optimum mixing without excessive disturbance of the slurry. The required air flow through the slurry for optimum mixing has been found to vary, depending upon the consistency and content of the slurry and the dimensions of the tank.
  • An object of the present invention is to overcome the disadvantages of the prior art by providing a reliable, repeatable and easy to use method and apparatus for mixing and aerating slurry in a slurry tank, for all types of slurry and sizes of tank.
  • the method further comprises the step of selecting the number of nozzles to be located in the bottom of the tank as a function of the area of the bottom of the tank.
  • the number of nozzles is selected to achieve a predetermined nozzle density.
  • Groups of said plurality of nozzles may be connected to separate air supply circuits, the number of circuits being selected to achieve a predetermined number of nozzles per circuit.
  • said method comprises the step of specifying an optimum assembly of a plurality of pipe sections, pipe connections and outlet nozzles to achieve the predetermined nozzle density. while minimising pressure losses.
  • the method comprises the further step of assembly said plurality of pipe sections, pipe connections and outlet nozzles and locating said assembly within the bottom of the tank in accordance with the determined specification.
  • the method comprises connecting the outlet nozzles to an air supply.
  • the method comprises connecting the circuits to the air supply via change over valves whereby the circuits can be sequentially placed In communication with the air supply.
  • the change over valves are associated with an air manifold connected to the air supply.
  • the air supply may comprise a blower, such as a roots type blower, or any other suitable source of compressed air.
  • the method comprises determining the air flow rate and/or supply pressure of the air supply as a function of the calculated slurry gauge pressure.
  • the method of determining said air flow rate and/or supply pressure of the air supply further comprises determining said air flow rate and/or supply pressure as a function of pressure losses though the air nozzles and circuits.
  • said pressure losses are determined as a function of one or more of the distance from the air supply to the furthest aeration circuit, the internal dimensions of the air circuits, the number and type of pipe fittings within the air circuits, and the number of circuits open simultaneously.
  • an apparatus for mixing slurry in a slurry tank comprising a kit of parts comprising a plurality of air supply pipes, a plurality of connection members for joining said air supply pipes, a plurality of outlet nozzles connectable to said air supply pipes for passing air into slurry contained within the slurry tank, an air supply for supplying air to the assembled air supply pipes, connection members and outlet nozzles, and a computer program programmed to calculate the slurry gauge pressure at the bottom of the slurry tank as a function of the slurry density and/or slurry consistency and the tank dimensions and to calculate the air pressure and/or flow rate of the air to be supplied to the assembled air supply pipes, connection members and outlet nozzles located within the bottom of the slurry tank by the air supply as a function of the the calculated slurry gauge pressure, and a control device for controlling the air supply to achieve said said calculated air pressure and/or flow rate.
  • control device comprises a programmable digital controller.
  • control device comprises a programmable digital controller.
  • the computer program determines the optimum arrangement of the air supply pipes, connection members and outlet nozzles within the slurry tank to achieve a predetermined nozzle density as a function of the slurry tank dimensions.
  • said air flow rate and/or supply pressure of the air supply is calculated as a function of pressure losses though the air supply pipes, connection members and outlet nozzles.
  • said air supply pipes, connection members and outlet nozzles are arranged to be assembled in a plurality of separate circuits, valve means being provided for enabling air to be supplied to the separate circuits independently and/or sequentially.
  • said plurality of circuits are connectable to the air supply via a manifold, said valve means being associated with or provided within the manifold.
  • the valve means comprises a plurality of solenoid valves.
  • the computer program calculates the number of air supply circuits to be assembled based upon the total number of nozzles required and the number of nozzles to be provided in each circuit and/or to minimise pressure losses.
  • a slurry mixing and aeration system comprises a plurality of air outlet nozzles 10 located on the bottom of the slurry tank 1, the outlet nozzles 10 being connected to an air supply by a number of air supply circuits, each circuit comprising approximately eighteen outlet nozzles 10 connected in series via a plurality of pipe sections and connectors.
  • the pipe section may comprise UPVC or galvanised steel pipes having a diameter of at least 50mm.
  • each circuit of 18 nozzles can cover an area of approximately 45 m 2 , allowing for a 1 metre void around the edge of the tank. Therefore the number of circuits required will depend upon the size of the slurry tank.
  • circuits A,B,C are used, two semicircular circuits A,B arranged around the periphery of the tank and a single central circuit C.
  • circuits D,E are required.
  • a non-return valve 12 ( Figure 2 ) is located at the inlet end of each circuit A,B,C,D,E to prevent the backflow of slurry into the air supply circuits.
  • Each circuit is connected to an air supply manifold 14, into which air is supplied from an air blower 16.
  • a solenoid valve 18 is associated with each circuit for controlling the supply of air from the manifold 14 into the respective circuit, the solenoid valves 18 being controlled by a controller, as will be described below, so that air can be supplied to each circuit sequentially,
  • Each air outlet nozzle 10 comprises a flattened neoprene sleeve 20 having an open end 22, as illustrated in Figure 3 .
  • the nozzle 10 comprises a UPVC socket 24 adapted to receive the end of an air supply pipe, a UPVC bushing 26 is mounted in one end of the socket 24, the bushing 26 threaded to receive a UPVC hose adaptor 28 to which is fitted the neoprene sleeve 20.
  • the sleeve 20 is secured onto the hose adaptor by means of a cable tie 30.
  • the apparatus is supplied as a kit of parts, comprising a plurality of pipe sections, a plurality of connectors and a plurality of outlet nozzles, at least one suitable manifold provided with sufficient outlets for the maximum number of circuits likely to be required, each outlet having a solenoid valve for controlling the supply of air to the respective outlet, a suitable air blower for supplying air to the manifold at the required pressure, and a programmable digital controller for controlling the operation of the system.
  • Part of the invention comprises the provision of software, capable of running on any Windows based PC, for determining the installation and operation of the system for a given slurry tank based upon the dimensions of the tank and the composition/solids content of the slurry to be mixed. For example, for a slurry containing 6% dry matter and 69 kg/m 3 total solids, the density of the slurry will be 944 kg/m 3 and the gauge pressure at the base of the tank can be calculated based upon the slurry density and the height of the tank.
  • the software is programmed to determine the layout of the nozzles, supply pipes and connections to achieve the optimum circuit layout that meets the nozzle density requirement while minimising pressure losses by minimising the distance of the further nozzle from the manifold. This is determined primarily as a function of the tank dimensions.
  • the software is also programmed to calculate the required air pressure and air flow rate from the air blower required to achieve the desired air flow from the nozzles.
  • the aim is to achieve between 0.75 and 1m3 of air flow per square metre of tank base area per aeration cycle (typically a twelve hour period). This ensured thorough turbulation of the slurry and avoids crust formation, while optimising the nutrient content of the slurry by encouraging aerobic digestion.
  • a first step is the calculation of the gauge pressure in the base of the tank as a function of the tank dimensions, slurry volume and slurry consistency.
  • the software calculates the gauge pressure at the floor of the tank based on the following variables:-
  • the software calculates the number of nozzles and circuits required to aerate the tank. This based on the nozzle density on the floor of the tank and the optimum number of nozzles per circuit.
  • the software then adds to the gauge pressure the pressure loss in the pipe work of the system based on:
  • the software checks that the blower unit is capable of working at this pressure. If not, a warning is provided indicating that the system will not work. There is an option to reduce the air flow from the nozzles at this stage.
  • the blower may be a roots type blower. However, the use of other sources of compressed air is envisaged.
  • the air supply pipes, connectors and nozzles are assembled in the specified arrangement and number of circuits and located within the slurry tank,
  • the pipes may be fixed to the base of the slurry tank by suitable plastic clips, preferably located at 1 metre intervals along the pipes, the clips being secured to the floor of the tank by stainless steel screws inserted into plugged apertures.
  • the pipes may be secured to the walls of the tank by similar fastening means.
  • a check valve is located at the entry of each circuit to into the slurry tank to prevent the back flow of slurry into the pipes and the circuits are connected to respective outlets of the air manifold, which is connected to the air blower.
  • the blower may be located within an acoustically isolated enclosure to reduce noise from the blower.
  • the programmable digital controller is programmed from the output of the software to operate the air supply to provide the calculated optimum air flow to the nozzles to achieve the desired air flow for optimised mixing and aeration of the slurry.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Claims (14)

  1. Verfahren zum Mischen von Gülle in einem Gülletank (1), das die folgenden Schritte umfasst: Berechnen des Manometerdrucks der Gülle am Boden des Gülletanks als Funktion der Dichte der Gülle und/oder der Konsistenz der Gülle und der Tankabmessungen, Lokalisieren einer Vielzahl von Austrittsdüsen (10) am Boden des Gülletanks und Einleiten von Luft aus einer Luftzuführung (16) zu einer Zusammensetzung aus Luftzuführungsrohren, Anschlussteilen und genannter Vielzahl von Austrittsdüsen (10) bei einem Luftdruck und/oder einer Durchflussrate, der/die als Funktion des berechneten Manometerdrucks der Gülle bestimmt wird/werden, und Steuern der Luftzuführung, um den/die genannte/n berechnete/n Luftdruck und/oder Durchflussrate zu erreichen.
  2. Verfahren nach Anspruch 1, worin das Verfahren weiter den Schritt des Auswählens der Anzahl von Düsen (10), die am Boden des Tanks (1) zu lokalisieren sind, als Funktion der Fläche des Bodens des Tanks umfasst.
  3. Verfahren nach einem vorstehenden Anspruch, worin Gruppen der genannten Vielzahl von Düsen (10) an separate Luftzuführungskreisläufe (A, B, C, D, E) angeschlossen sind, wobei die Anzahl von Kreisläufen ausgewählt wird, um eine vorbestimmte Anzahl von Düsen pro Kreislauf zu erreichen.
  4. Verfahren nach Anspruch 3, worin das Verfahren das Anschließen der genannten Vielzahl von Luftzuführungskreisläufen an die Luftzuführung über Wechselventile (18) umfasst, wodurch die Kreisläufe sequentiell mit der Luftzuführung (16) in Verbindung gebracht werden.
  5. Verfahren nach Anspruch 4, worin die Wechselventile (18) mit einem Luftverteiler (14) verbunden sind, der an die Luftzuführung (16) angeschlossen ist.
  6. Verfahren nach einem vorstehenden Anspruch, worin das Verfahren des Bestimmens der genannten Luftdurchflussrate und/oder des genannten Zuführungsdrucks der Luftzuführung weiter das Bestimmen der genannten Luftdurchflussrate und/oder des genannten Zuführungsdrucks als Funktion der Druckverluste durch die Luftdüsen und Kreisläufe umfasst.
  7. Verfahren nach Anspruch 6, worin die genannten Druckverluste als Funktion von einem oder mehreren der Folgenden bestimmt werden: der Distanz von der Luftzuführung zum weitesten Belüftungskreislaufs, der inneren Abmessungen der Luftkreisläufe, der Anzahl und Art der Rohranschlussstücke innerhalb der Luftkreisläufe und der Anzahl der gleichzeitig geöffneten Kreisläufe.
  8. Vorrichtung zum Mischen von Gülle in einem Gülletank, wobei die genannte Vorrichtung einen Bauteilesatz umfasst, der Folgendes umfasst: eine Vielzahl von Luftzuführungsrohren, eine Vielzahl von Anschlussteilen zum Verbinden der genannten Luftzuführungsrohre, eine Vielzahl von Austrittsdüsen (10), die an die genannten Luftzuführungsrohre anschließbar sind, zum Einleiten von Luft in die Gülle, die innerhalb des Gülletanks (1) enthalten ist, eine Luftzuführung (16) zum Zuführen von Luft zu den zusammengefügten Luftzuführungsrohren, Anschlussteilen und Austrittsdüsen (10) und ein Rechnerprogramm, das programmiert ist, um den Manometerdruck der Gülle am Boden des Gülletanks als Funktion der Dichte der Gülle und/oder der Konsistenz der Gülle und der Tankabmessungen zu berechnen und den Luftdruck und/oder die Durchflussrate der Luft, die den zusammengefügten Luftzuführungsrohren, Anschlussteilen und Austrittsdüsen, die innerhalb des Bodens des Gülletanks lokalisiert sind, durch die Luftzuführung (16) zuzuführen ist, als Funktion des berechneten Manometerdrucks der Gülle zu berechnen, und ein Steuergerät zur Steuerung der Luftzuführung, um den/die genannte/n berechnete/n Luftdruck und/oder Durchflussrate zu erreichen.
  9. Vorrichtung nach Anspruch 8, worin das Steuergerät einen programmierbaren digitalen Regler umfasst.
  10. Vorrichtung nach Anspruch 8 oder Anspruch 9, worin das Rechnerprogramm die optimale Anordnung der Luftzuführungsrohre, Anschlussteile und Austrittsdüsen innerhalb des Gülletanks bestimmt, um eine vorbestimmte Düsendichte als Funktion der Abmessungen des Gülletanks zu erreichen.
  11. Vorrichtung nach einem der Ansprüche 8 bis 10, worin die genannte Luftdurchflussrate und/oder der genannte Zuführungsdruck der Luftzuführung als Funktion der Druckverluste durch die Luftzuführungsrohre, Anschlussteile und Austrittsdüsen berechnet wird.
  12. Vorrichtung nach einem der Ansprüche 8 bis 11, worin die genannten Luftzufiihrungsrohre, Anschlussteile und Austrittsdüsen angeordnet sind, um in einer Vielzahl von separaten Kreisläufen (A, B, C, D, E) zusammengefügt zu werden, wobei Ventilmittel (18) bereitgestellt sind, um zu ermöglichen, dass Luft zu den separaten Kreisläufen unabhängig und/oder sequentiell zugeführt wird.
  13. Vorrichtung nach Anspruch 12, worin die genannte Vielzahl von Kreisläufen (A, B, C, D, E) an die Luftzuführung (16) über einen Verteiler (14) anschließbar ist, wobei die genannten Ventilmittel (18) mit dem Verteiler (14) verbunden sind oder innerhalb des Verteilers (14) bereitgestellt werden, wobei die genannten Ventilmittel (18) bevorzugt eine Vielzahl von Magnetventilen umfassen.
  14. Vorrichtung nach einem der Ansprüche 8 bis 13, worin das Rechnerprogramm die Anzahl von Luftzuführungskreisläufen (A, B, C, D, E), die zusammenzufügen sind, auf der Grundlage der Gesamtanzahl der erforderlichen Düsen (10) und der Anzahl der Düsen (10), die in jedem Kreislauf bereitzustellen sind und/oder Druckverluste zu minimieren, berechnet.
EP09015822A 2009-01-08 2009-12-22 Verfahren und Vorrichtung zum Mischen von Schlamm Active EP2206548B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09015822T PL2206548T3 (pl) 2009-01-08 2009-12-22 Sposób i urządzenie do mieszania gnojowicy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0900166.0A GB0900166D0 (en) 2009-01-08 2009-01-08 Method and apparatus for mixing slurry

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EP2206548A1 EP2206548A1 (de) 2010-07-14
EP2206548B1 true EP2206548B1 (de) 2012-09-12

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GB (1) GB0900166D0 (de)
PL (1) PL2206548T3 (de)

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CL2011001145A1 (es) * 2011-05-17 2011-08-26 Aeon Biogroup Spa Sistema de cultivo de microalgas que comprende un modelo celular con tres unidades de cultivo tipo bioreactor, cada unidad consta de un estanque, una tapa transparente, un primer aireador, un segundo aireador, una linea de recirculación, una cañeria y válvula de entrada de gases, y una cañeria y valvula de entrada de líquidos; y método.
RU2570492C2 (ru) * 2012-02-21 2015-12-10 Борис Лаврович Макеев Устройство для подготовки к раздаче первых блюд в столовых общепита
CN105148769A (zh) * 2015-10-19 2015-12-16 攀钢集团工程技术有限公司 矿浆搅拌槽反冲洗装置
CN105771767A (zh) * 2016-03-09 2016-07-20 宁波钢铁有限公司 一种气体搅拌装置
CN114671410B (zh) * 2020-12-24 2023-06-09 大连理工江苏研究院有限公司 一种稳定剂的添加系统

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JPS5673531A (en) * 1979-11-16 1981-06-18 Hitachi Plant Eng & Constr Co Ltd Draft agitating method and device
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WO2004091764A1 (en) * 2003-04-08 2004-10-28 Parks Richard E Apparatus and method for gas induced mixing and agitating of a fermenting juice in a tank during vinification

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EP2206548A1 (de) 2010-07-14
PL2206548T3 (pl) 2013-03-29
GB0900166D0 (en) 2009-02-11

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