EP3781297A2 - Installation d'atomisation - Google Patents

Installation d'atomisation

Info

Publication number
EP3781297A2
EP3781297A2 EP19766346.1A EP19766346A EP3781297A2 EP 3781297 A2 EP3781297 A2 EP 3781297A2 EP 19766346 A EP19766346 A EP 19766346A EP 3781297 A2 EP3781297 A2 EP 3781297A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
flow
plant according
flow rate
adjusting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19766346.1A
Other languages
German (de)
English (en)
Inventor
Stefano Cassani
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3781297A2 publication Critical patent/EP3781297A2/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3026—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being a gate valve, a sliding valve or a cock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3468—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with means for controlling the flow of liquid entering or leaving the swirl chamber
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62655—Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
    • 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
    • F26B3/10—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 carrying the materials or objects to be dried with it
    • F26B3/12—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 carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
    • B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts

Definitions

  • the present invention relates to an atomization plant.
  • the invention is useful in the ceram ics industry for manufacturing ceram ic tiles starting from a form ing process performed by pressing ceramic powders consisting of atom ized materials.
  • the fluid to be atom ized that in the specific application is called slip
  • slip is injected into a cham ber of the atom iser by nozzles that form a spray.
  • the spray is struck in counter-flow by a flow of hot air.
  • the nozzles have a fixed calibrated diameter and the spraying devices are operated at the maxim um possible flow rate.
  • the method used in the prior art provides for changing the type of nozzles. This configures a system which is very rigid and which does not allow keeping the process under control with sufficient continuity over time, so as to adapt characteristics and performance of the process to the whole tile production process.
  • the main object of the present invention is to obviate the lim itations of the prior art by providing a system by which an efficient adjustment of the atom iser operation can be carried out without necessity of operations that require stops of the production process.
  • FIG. 1 is a schematic front view in vertical elevation of a first embodiment
  • FIG. 2 is a schematic plan view partially sectioned according to the section plane l-l of Figure 1 ;
  • FIG. 3 shows a simplified diagram of the plant of the embodiment of Figures 1 and 2 in enlarged scale
  • FIG. 4 shows an enlarged-scale view of a detail of the embodiment of Figures 1 and 2 according to the simplified diagram of Figure 3;
  • FIG. 5 shows a simplified diagram of the system in a further embodiment of Figures 1 and 2 in enlarged scale
  • FIG. 6 shows an enlarged-scale view of a detail of the embodiment of Figures 1 and 2 according to the simplified diagram of Figure 5;
  • FIG. 7 is a schematic front view in vertical elevation of a second embodiment
  • Figure 8 shows a schematic plan view partially sectioned according to the section plane 1 1 -1 1 of Figure 7;
  • FIG. 9 shows a simplified diagram of the plant of the embodiment of Figures 7 and 8 in enlarged scale
  • FIG. 10 shows a simplified diagram of the system in a further embodiment of Figures 7 and 8 in enlarged scale
  • - Figure 1 1 shows a schematic front view in vertical elevation of a third embodiment
  • Figure 12 shows a schematic plan view partially sectioned according to the section plane Ill-Ill of Figure 1 1 ;
  • FIG. 13 shows a simplified diagram of the plant of the embodiment of figures 1 1 and 12 in enlarged scale
  • FIG. 14 shows a detail of the embodiment of figures 1 1 and 12 in enlarged scale.
  • 1 denotes a tower for atomization, which is used for the production of atomized material that, in this case, is used for forming tiles by pressing.
  • the atomization tower 1 is fed at top by a flow of hot air, which is drawn by the main fan 22 and sent by a pressurization fan 16 through a duct 14, in which the air is heated by a burner 15.
  • the atomization tower 1 is equipped with a collection bottom tapered downwards 2, above which a plurality of nozzles 4 equipped with calibrated holes are arranged.
  • Each of the nozzles is intended for emitting a jet of fluid 5 or slurry (consisting of a suspension), in the specific case called slip, which takes the form of a jet of nebulized fluid 13, that is in the form of a spray consisting of small drops of slip.
  • slip which takes the form of a jet of nebulized fluid 13, that is in the form of a spray consisting of small drops of slip.
  • the droplets undergo a fast drying, which makes them take a solid form generally hollow inside.
  • the fluid or slip 5 is taken from a tank 6 by means of a volumetric pump 1 1 and is sent under pressure to the plurality of nozzles 4 by means of a supply manifold 3.
  • a filter 17 performs a last filtration of the slip.
  • a heater 21 provides for preheating the slip before entering the atomization tower 1.
  • the plant is provided with a system for regulating the flow rate of the fluid supply 5 to each nozzle 4.
  • each nozzle 4 is fed by means of a two-way valve 7 designed to reduce the flow rate and servo controlled by an actuator 9 that is driven by means of a control system of the plant.
  • a control system of the plant Through this control system the flow rate of the nozzles 4 can be varied during the normal operation of the atomization plant; the variation of the supply rate of each nozzle causes a variation of pressure that can be easily measured by the pressure gauge 24.
  • the variation in flow rate results in a variation in the average size of the atomised material and therefore in a variation in the relative particle size curve.
  • the supply manifold 3 is shaped as a circumference arc to feed the said plurality of nozzles 4 which are arranged concentrically to form a lance 10.
  • the atomized powder is discharged onto the belt 19 through the bottom 18 of the atomization tower 1 , which in addition to the exhaust valve can include a cooling system.
  • the air exiting the atomization tower 1 passes through the cyclone 20 for the recovery of a further fraction of fine powder to be sent from the main fan 22 to chimney 23 for discharge into the atmosphere.
  • the two-way flow control valve 8 is provided instead of the flow reducing valve 7.
  • This flow control valve 8, shown in greater detail in Figure 6, is servo controlled by the actuator 9: differently from the flow reducing valve 7, the two-way flow control valve 8 allows the flow to be kept constant in presence of pressure variations that may occur both at the inlet and outlet.
  • the supply manifold 3 is fed by the positive displacement pump 1 1 at one end, and includes a return pipe 12 at the other end.
  • the supply circuit of the nozzles 4 is provided with a return pipe 12 which opens in the fluid tank 6.
  • each nozzle 4 is supplied with the interposition of a flow rate reducing valve 7 that is servo controlled by an actuator 9 driven by means of a control system of the plant.
  • each of said nozzles 4 is fed by a two-way flow rate control valve 8.
  • a further two-way flow rate control valve 8 is also provided for adjusting the flow rate along the return pipe 12.
  • each nozzle 4 is supplied with the interposition of a three-way flow control valve 25 servo controlled by an actuator 9 that is driven by means of a control system of the plant.
  • the device for regulating the supply flow rate of the fluid 5 of at least one nozzle 4 can also include a variable displacement pump.
  • the working parameters and therefore the characteristics of the product can be continuously changed, even during the operation of the production plant.
  • the flow rate and the inlet pressure for each nozzle can be suitably adjusted over time; in this manner, the effect of wear in the delivery section of the fluid from the nozzle can be automatically compensated.
  • the device for regulating the flow rate 7, 8, 25, servo controlled by the actuator 9 is driven by means of a control system of the plant for setting the desired trend of the pressure at the inlet to the nozzle 4 measured by the pressure gauge 24 over time. Moreover, different operating conditions can be adopted for various nozzles present inside the atomization tower.
  • This makes it possible to adjust and correct the particle size distribution curve of the atomized material as a function of the requirements detected downstream, that is, of the problems of various types that can somehow be related to the characteristics of the atomized material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Nozzles (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention a pour objet une installation d'atomisation pour solutions liquides ou en suspension, du type comprenant une tour d'atomisation (1) qui est alimentée par le haut en un flux d'air chaud et est pourvue, au fond, d'un collecteur d'alimentation (3) placé au-dessus d'un fond de collecte (2), effilé vers le bas et maintenu sous pression afin d'apporter une solution liquide ou une suspension à une pluralité de buses (4). Les buses éjectent la solution liquide ou la suspension transformée en petites gouttes, qui sont frappées en contre-courant dans le flux d'air chaud. L'installation comprend un dispositif conçu pour régler le débit du fluide (5) apporté aux buses (4), qui sont alimentées au moyen d'un dispositif de réglage du débit (7, 8, 25) qui est asservi par un actionneur (9). L'actionneur est commandé par un système de commande de l'installation.
EP19766346.1A 2018-04-20 2019-04-16 Installation d'atomisation Pending EP3781297A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000004768A IT201800004768A1 (it) 2018-04-20 2018-04-20 Impianto di atomizzazione
PCT/IB2019/000273 WO2019202384A2 (fr) 2018-04-20 2019-04-16 Installation d'atomisation

Publications (1)

Publication Number Publication Date
EP3781297A2 true EP3781297A2 (fr) 2021-02-24

Family

ID=62952280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19766346.1A Pending EP3781297A2 (fr) 2018-04-20 2019-04-16 Installation d'atomisation

Country Status (3)

Country Link
EP (1) EP3781297A2 (fr)
IT (1) IT201800004768A1 (fr)
WO (1) WO2019202384A2 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630403A (en) * 1979-08-20 1981-03-27 Kanegafuchi Chem Ind Co Ltd Preparation of coagulated latex
JPS6012895B2 (ja) * 1979-11-28 1985-04-04 三井東圧化学株式会社 造粒装置
JP3118055B2 (ja) * 1992-01-30 2000-12-18 日清製粉株式会社 微粒子コーティング方法および装置ならびに噴霧用ノズル
DE10008389A1 (de) * 2000-02-23 2001-08-30 Guenter Slowik Verfahren und Leitungssystem zur Beeinflussung des Tropfenspektrums von fluiden Stoffen bei deren Zerstäubung

Also Published As

Publication number Publication date
IT201800004768A1 (it) 2019-10-20
WO2019202384A3 (fr) 2019-11-28
WO2019202384A2 (fr) 2019-10-24

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