EP3991858B1 - Procédés de fonctionnement pour un trieur et trieur de classification - Google Patents

Procédés de fonctionnement pour un trieur et trieur de classification Download PDF

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Publication number
EP3991858B1
EP3991858B1 EP21201374.2A EP21201374A EP3991858B1 EP 3991858 B1 EP3991858 B1 EP 3991858B1 EP 21201374 A EP21201374 A EP 21201374A EP 3991858 B1 EP3991858 B1 EP 3991858B1
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EP
European Patent Office
Prior art keywords
separator
temperature
superheated steam
separating gas
gas
Prior art date
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Active
Application number
EP21201374.2A
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German (de)
English (en)
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EP3991858A1 (fr
Inventor
Frank Winter
Joachim Domes
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.)
Netzsch Trockenmahltechnik GmbH
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Netzsch Trockenmahltechnik GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature
    • F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
    • F22G5/123—Water injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G7/00—Steam superheaters characterised by location, arrangement, or disposition

Definitions

  • the present invention relates to an operating method for a classifier and a classifier for classification.
  • This jet mill air classifier contains a classifying wheel and a classifying wheel shaft as well as a classifier housing.
  • a sifter gap is defined between the sifter wheel and the sifter housing and a shaft bushing is formed between the sifter wheel shaft and the sifter housing.
  • the classifier gap and/or shaft bushing is flushed with compressed gases with low energy content, although the grinding nozzles of the jet mill themselves are charged with high-energy superheated steam.
  • What is special about this design is the combination that grinding nozzles are charged with high-energy superheated steam, i.e. a high-energy medium, while low-energy media are used in the classifier.
  • the EP2959975A1 discloses a method for producing the finest particles by means of a jet mill, the operating medium being a fluid, in particular water vapor, which has a higher speed of sound than air (343 m/s), and also discloses a jet mill for producing the finest particles, wherein a source for an operating medium, in particular water vapor, which has a higher speed of sound than air (343 m/s).
  • the known processes and classifiers generally lead to good results.
  • the aim of the present invention is to improve the operating method for a sifter and a sifter in such a way that higher fineness can be achieved in the ground product output, in particular compared to sifting with air or inert gases.
  • This goal is achieved with an operating method for a classifier for the classification of ground material in particular, with superheated water vapor being supplied to the classifier as classifying gas, and with the temperature of the superheated water vapor being chosen as classifying gas so low that there is no condensation of the overheated water vapor comes in the sifter.
  • the aforementioned goal is achieved with a sifter for classifying, in particular, ground material, the sifter containing a sifting gas supply with a water feed for generating superheated water vapor as sifting gas, and adjusting or regulating devices for the temperature of the superheated water vapor as sifting gas being provided and designed in this way are that the temperature of the superheated water vapor as classifying gas is set so low that there is no condensation of the superheated water vapor in the classifier.
  • the superheated water vapor in is used in a cycle gas process.
  • the necessary superheated steam is generated by supplying liquid water.
  • a further preferred embodiment of the operating method for a classifier for classifying regrind in particular is that superheated water vapor is also supplied to the classifier to flush a classifier gap of the classifier and/or to protect the bearings of the classifier from product contamination.
  • the operating method for a classifier for the classification of ground material in particular can be developed in such a way that, if necessary, a pressure difference is generated in the circuit using a classifying gas blower or classifying gas compressor to promote the flow of the classifying gas. It can also preferably be provided that the pressure difference is set or regulated depending on system resistances, and in particular it can be provided that the temperature of the superheated steam in connection with the heating and the discharge of the visible material is used for setting or regulating the temperature of the superheated water vapor is used as a classifying gas in the classifier.
  • a yet further preferred embodiment of the operating method for a classifier for classifying ground material in particular is that the temperature of the superheated water vapor as classifying gas is carried out by adjusting or regulating the amount and/or temperature of liquid water that is introduced into the classifying gas.
  • the classifier can advantageously be further developed in that a circuit for the superheated steam is included.
  • flushing devices are included and designed for a classifier gap of the classifier and/or to protect the bearings of the classifier from product contamination in order to supply superheated water vapor to the corresponding points.
  • a classifying gas blower or classifying gas compressor to promote the flow of the classifying gas is optionally included in the circuit through a pressure difference. It can preferably also be provided that adjustment or control devices are provided for the sifting gas blower or the sifting gas compressor for adjusting or regulating the pressure difference depending on system resistances, which can be further developed by at least one temperature sensor for the superheated water vapor, which is at the output assigned to the classifier and functionally coupled to the setting or control devices for the temperature of the superheated water vapor as a classifying gas, so that the output of this temperature sensor is used as the input of the setting or control devices for the temperature of the superheated water vapor to be taken into account.
  • the water feed is coupled to the setting or control devices for the temperature of the superheated water vapor as a classifying gas and is designed in such a way that the temperature of the superheated water vapor as a classifying gas can be set or controlled by setting or regulating of the amount and/or temperature of liquid water that is introduced into the screening gas.
  • Fig. 1 an exemplary embodiment of a classifier 1 is illustrated in a schematic sketch, in which the individual components of the classifier 1 and their connections are only illustrated as examples.
  • the proportions of the in the Fig. 1 The components of the sifter 1 shown do not correspond to reality, but were only chosen in the given manner for understanding and reasons of recognizability.
  • the underlying method is a method for classifying, ie for classifying, in particular, ground material, in particular but not necessarily from a mill (not shown), such as a jet mill, with superheated steam, preferably but not limited to this, in a circulating gas process, with the classifier 1 in Process flow may be integrated into the mill before a regrind outlet or may be connected downstream as a separate apparatus of the mill, ie its regrind outlet.
  • the classifier 1 contains a dynamic classifier wheel 2, which is rotatably arranged in a classifier housing 3 about a classifier wheel axis (not shown) and is spaced from the inner wall (not designated) of the classifier housing 3 by a so-called classifier gap (not shown).
  • the classifier wheel 2 is rotatably mounted in at least one bearing (not shown) of the classifier 1 to achieve its rotation.
  • Classified material S which comes, for example, from a mill (not shown) or its grinding chamber (not shown), is fed to the classifier 1 via a classified material feed as a classifier inlet 4.
  • the classified material S is, for example, but not necessarily introduced into the classifier housing 3 in a metered manner via a rotary valve as a feed lock 5.
  • Coarse material G which needs to be ground further or again or is sorted out because it is still too coarse, leaves the classifier 1 through, for example, a coarse material lock 6.
  • Fine material F which meets the desired final specifications, passes through the classifier wheel 2 and is conveyed with classifying gas into a filter 7 and leaves this filter 7 at the end to the atmosphere through, for example, a fine material lock 8.
  • the screening gas is at least largely passed on to a screening gas or generally process gas compressor 9, which is preceded by, for example, a security or police filter 10 for its protection.
  • the sifting gas compressor which can be implemented for example by a sifting gas blower 9 and can be referred to as such, generates the necessary pressure difference to convey the process gas and in particular sifting gas in the circuit in the example shown.
  • the classifying/process gas blower or the classifying/process gas compressor 9 is advantageously designed in such a way that all system resistances can be overcome in order to generate a stable process gas flow and in particular classifying gas flow.
  • the exemplary embodiment of the classifier 1 shown is a pipeline 11, water injection fittings 12, a control valve 13, a temperature sensor 14, an operating pressure sensor 15, a supply pressure sensor 16, a control valve 17, a water feed 18 and an exhaust steam outlet 19.
  • the difference in energy flows is used to evaporate and superheat the added liquid water.
  • the amount of liquid water supplied via the water feed 18 is added in such a way that the resulting water vapor is in superheated form at every point in the system due to the difference in energy flows.
  • the water feed 18 is connected downstream of the classifying or process gas blower in the direction of flow of the classifying and process gas, where the highest temperature level in the system, i.e. the classifier 1 with all its components, is located.
  • the circulating gas temperature is measured at various points in the system.
  • the temperature after classifier 1 is used as the controlled variable. As expected, the greatest drop in temperature will occur here due to the heating and the discharge of the visible material. This temperature drop can be calculated.
  • the process is cooled by the enthalpy of vaporization of the water and can therefore be kept at a constant temperature level. This creates superheated water vapor. In any case, it is important to avoid falling below the saturated steam temperature, otherwise condensate will form and safe operation of the process will no longer be possible. Since the saturated steam temperature is pressure-dependent, this pressure in the system, i.e. in the classifier 1, is preferably measured continuously and the saturated steam temperature is calculated from this. A comparison with the real temperatures is preferably also carried out continuously.
  • the entire system ie the classifier 1, is preferably insulated in a heat-tight manner.
  • the entry elements, in particular rotary valve as feed lock 5, and discharge elements, in particular coarse material lock 6 and fine material lock 8, as well as filter 7 and security or police filter 10 are advantageously equipped with additional trace heating.
  • an operating pressure sensor 15 is installed in front of the classifier housing 3, which regulates the system pressure via the control valve 13 or a corresponding control flap.
  • any desired or required system pressure can be set. This amount of water, which turns into superheated water vapor, removes the air in the system and the air supplied by the product during operation from the process.
  • a further pressure control via the supply pressure sensor 16 and the control valve 17 is provided upstream of the sighting gas or process gas compressor 9. This can be used to increase the overall system resistance if necessary. The result of this is that the energy input through the classifying/process gas blower or the classifying/process gas compressor 9 is increased. This may be necessary at very high throughputs and the associated greater cooling of the process gas during the classifying process due to the removal of coarse material G and fine material F.
  • Classifier 300 mbar Product filter 15 mbar Security filter 10 mbar Total pressure drop across the system components 325 mbar
  • Classifier 300 mbar Product filter 15 mbar Security filter 10 mbar Total pressure drop across the system components 325 mbar
  • a further pressure control via the supply pressure sensor 16 and the control valve 17 can be provided upstream of the sighting or process gas compressor 9. This can be used to increase the overall system resistance if necessary. The result of this is that the energy input through the classifying/process gas blower or the classifying/process gas compressor 9 is increased. This can enable advantageous compensation at very high throughputs and the associated greater cooling of the process gas during the classifying process by removing coarse material G and fine material F.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Drying Of Solid Materials (AREA)
  • Disintegrating Or Milling (AREA)
  • Separating Particles In Gases By Inertia (AREA)

Claims (15)

  1. Procédé opérationnel pour un séparateur (1) pour la classification
    caractérisé
    en ce que l'on amène au séparateur (1) de la vapeur d'eau surchauffée en tant que gaz de séparation et en ce que l'on sélectionne la température de la vapeur d'eau surchauffée en tant que gaz de séparation à un niveau si bas qu'il ne se produise justement aucune condensation de la vapeur d'eau surchauffée dans le séparateur (1).
  2. Procédé opérationnel pour un séparateur (1) pour la classification selon la revendication 1,
    caractérisé
    en ce que l'on règle ou l'on régule la température de la vapeur d'eau surchauffée en tant que gaz de séparation en fonction
    - de la pression absolue sur une entrée (4) de séparateur en bar(a),
    - de la température du produit à séparer,
    - de la capacité thermique d'un produit à séparer (S) en J/kgK,
    - d'une quantité de distribution du produit en kg/h,
    - de l'apport énergétique d'un gaz de séparation / d'un compresseur de gaz de processus (9) contenu,
    - de l'apport énergétique par le séparateur (1),
    - de la masse de l'eau injectée pour la génération de la vapeur et le refroidissement du gaz de séparation in kg/h, et / ou
    - des pertes de flux thermique par émission vers l'environnement en W.
  3. Procédé opérationnel pour un séparateur (1) pour la classification selon la revendication 1 ou 2, caractérisé
    en ce que l'on met en œuvre la vapeur d'eau surchauffée dans un processus de gaz de recyclage, la vapeur d'eau surchauffée nécessaire étant générée de préférence par l'alimentation d'eau liquide.
  4. Procédé opérationnel pour un séparateur (1) pour la classification selon l'une quelconque des revendications précédentes,
    caractérisé
    en ce que l'on alimente de la vapeur d'eau surchauffée vers le séparateur (1) également pour rincer une fente du séparateur (1) et / ou pour protéger les paliers du séparateur (1) contre un encrassement par le produit.
  5. Procédé opérationnel pour un séparateur (1) pour la classification selon l'une quelconque des revendications précédentes,
    caractérisé
    en ce que pour transporter la circulation du gaz de séparation, l'on génère le cas échéant dans le circuit une pression différentielle avec un ventilateur de gaz de séparation ou un compresseur de gaz de séparation (9).
  6. Procédé opérationnel pour un séparateur (1) pour la classification selon la revendication 5,
    caractérisé
    en ce que l'on règle ou l'on régule la pression différentielle en fonction de résistances de l'installation.
  7. Procédé opérationnel pour un séparateur (1) pour la classification selon l'une quelconque des revendications précédentes,
    caractérisé
    en ce que l'on implique la température de la vapeur d'eau surchauffée en relation avec l'échauffement et l'évacuation du produit à séparer pour le réglage ou la régulation de la température de la vapeur d'eau surchauffée en tant que gaz de séparation dans le séparateur (1).
  8. Procédé opérationnel pour un séparateur (1) pour la classification selon l'une quelconque des revendications précédentes,
    caractérisé
    en ce que la température de la vapeur d'eau surchauffée en tant que gaz de séparation s'effectue par réglage ou régulation de la quantité et / ou de la température de l'eau liquide, que l'on introduit dans le gaz de séparation.
  9. Séparateur (1) pour la classification,
    caractérisé
    en ce que le séparateur (1) contient une alimentation de gaz de séparation, pourvu d'une amenée d'eau (18) pour générer de la vapeur d'eau surchauffée en tant que gaz de séparation, et en ce que des dispositifs de réglage ou de régulation (20) sont prévus pour la température de la vapeur d'eau surchauffée en tant que gaz de séparation et conçus de telle sorte que la température de la vapeur d'eau surchauffée en tant que gaz de séparation soit réglée à un niveau si bas, qu'il ne se produise justement aucune condensation de la vapeur d'eau surchauffée dans le séparateur (1).
  10. Séparateur (1) selon la revendication 9,
    caractérisé
    en qu'il contient un circuit pour la vapeur d'eau surchauffée.
  11. Séparateur (1) selon la revendication 9 ou 10,
    caractérisé
    en ce que des dispositifs pout rincer une fente de séparateur du séparateur (1) et / ou pour protéger les paliers du séparateur (1) contre un encrassement par le produit sont contenus et conçus pour alimenter de de la vapeur d'eau surchauffée vers les zones correspondantes.
  12. Séparateur selon l'une quelconque des revendications 9 à 11,
    caractérisé
    en ce qu'il contient un ventilateur de gaz de séparation ou un compresseur de gaz de séparation (9) destiné à transporter la circulation du gaz de séparation le cas échéant dans le circuit, par une pression différentielle.
  13. Séparateur selon la revendication 12,
    caractérisé
    en ce que des dispositifs de réglage ou de régulation (20) sont prévus pour le ventilateur de gaz de séparation ou pour le compresseur de gaz de séparation (9), pour régler ou réguler la pression différentielle en fonction de résistances de l'installation.
  14. Séparateur selon la revendication 13,
    caractérisé
    en ce qu'au moins une sonde thermique (14) pour la vapeur d'eau surchauffée est associée à la sortie du séparateur et est couplée fonctionnellement avec les dispositifs de réglage ou de régulation (20) pour la température de la vapeur d'eau surchauffée en tant que gaz de séparation, de telle sorte que l'édition de ladite sonde thermiques (14) soit utilisée en tant que saisie à considérer pour les dispositifs de réglage ou de régulation (20) pour la température de la vapeur d'eau surchauffée.
  15. Séparateur (1) selon l'une quelconque des revendications 9 à 14,
    caractérisé
    en ce que l'amenée d'eau (18) est couplée avec les dispositifs de réglage ou de régulation (20) pour la température de la vapeur d'eau surchauffée en tant que gaz de séparation et conçue de telle sorte, que par cet intermédiaire, le réglage ou la régulation de la température de la vapeur d'eau surchauffée en tant que gaz de séparation soit réalisée par réglage ou par régulation de la quantité et / ou de la température d'eau liquide qui est introduite dans le gaz de séparation.
EP21201374.2A 2020-11-03 2021-10-07 Procédés de fonctionnement pour un trieur et trieur de classification Active EP3991858B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020006724.7A DE102020006724A1 (de) 2020-11-03 2020-11-03 Betriebsverfahren für einen Sichter und Sichter zur Klassifizierung

Publications (2)

Publication Number Publication Date
EP3991858A1 EP3991858A1 (fr) 2022-05-04
EP3991858B1 true EP3991858B1 (fr) 2024-03-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21201374.2A Active EP3991858B1 (fr) 2020-11-03 2021-10-07 Procédés de fonctionnement pour un trieur et trieur de classification

Country Status (6)

Country Link
US (1) US11745221B2 (fr)
EP (1) EP3991858B1 (fr)
JP (1) JP7312804B2 (fr)
KR (1) KR20220059915A (fr)
CN (1) CN114433343B (fr)
DE (1) DE102020006724A1 (fr)

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Also Published As

Publication number Publication date
US20220134383A1 (en) 2022-05-05
EP3991858A1 (fr) 2022-05-04
DE102020006724A1 (de) 2022-05-05
JP2022075524A (ja) 2022-05-18
JP7312804B2 (ja) 2023-07-21
CN114433343A (zh) 2022-05-06
CN114433343B (zh) 2023-10-20
US11745221B2 (en) 2023-09-05
KR20220059915A (ko) 2022-05-10

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