EP1955759B1 - Method and apparatus for moisturizing dusting material - Google Patents

Method and apparatus for moisturizing dusting material Download PDF

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Publication number
EP1955759B1
EP1955759B1 EP08397504A EP08397504A EP1955759B1 EP 1955759 B1 EP1955759 B1 EP 1955759B1 EP 08397504 A EP08397504 A EP 08397504A EP 08397504 A EP08397504 A EP 08397504A EP 1955759 B1 EP1955759 B1 EP 1955759B1
Authority
EP
European Patent Office
Prior art keywords
reaction chamber
substance
liquid
connection
fed
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.)
Active
Application number
EP08397504A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1955759A2 (en
EP1955759A3 (en
Inventor
Ensio Miettinen
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to PL08397504T priority Critical patent/PL1955759T3/pl
Publication of EP1955759A2 publication Critical patent/EP1955759A2/en
Publication of EP1955759A3 publication Critical patent/EP1955759A3/en
Application granted granted Critical
Publication of EP1955759B1 publication Critical patent/EP1955759B1/en
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Classifications

    • 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
    • B01F23/50—Mixing liquids with solids
    • B01F23/54—Mixing liquids with solids wetting solids
    • 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
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1121—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades pin-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/62—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis comprising liquid feeding, e.g. spraying means
    • B01F27/621—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis comprising liquid feeding, e.g. spraying means the liquid being fed through the shaft of the stirrer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms

Definitions

  • the present invention relates to a method, according to the preamble of Claim 1, for moisturizing a dusting, flowing solid material.
  • the scope of the application includes, for example, the moisturizing and cooling of power-plant ash, the moisturizing of the constituent components of concrete, the moisturizing of dry substances in the paper industry, and even the pre-moisunizing of dry substances in bakeries. In general, the is intended for the moisturizing of dry substances in process industries.
  • the invention also relates to an arrangement for implementing the method.
  • moisturizing is intended to reduce the temperature, in order to avoid the risk of combustion, as well as to facilitate handling and to prevent dusting.
  • moisturizing can be intended to form mixtures from dusting substances and substances requiring to be moisturized.
  • Such processes exist, for example, in the bakery industry and the paper industry, in which mixtures for use elsewhere in the process are formed from fine-particle solids together with water or some other liquid.
  • Dusting substances are fine-particle, flowing substances already due to their nature. They are quite difficult to moisturized affectively. When dusting substances come into contact with a liquid, the substance certainty moisturizes easily, after which it easily forms a sticky mass, through which water penetrates poorly. Thus a fine-particle, dry substance easily collects into lumps, the centre of which is dry while the surface layer prevents the material in the centre from moisturizing.
  • the sludge forming the surface layer is often quite adhesive, so that the material to be moisturized sticks easily and firmly to any surface that it touches. A great deal of energy is required to disperse the sludge and lumps and detach the mass that has adhered to the walls of the equipment. On the other hand, there is a great danger of blockage while the reliable operation of the moisturizing devices demands much cleaning and maintenance work.
  • US 4 527 902 discloses a method and an apparatus in accordance with the preamble of claims 1 and 7.
  • the apparatus used comprises a vertical mixing chamber with a vertical mixing axle.
  • a feeding connection for wood chips and feeding nozzles for glue has been arranged over the axle at the upper part of the chamber.
  • the exit outlet is arranged on the opposite end of the mixing chamber and under the mixing axle.
  • the present invention is intended to create a moisturizing apparatus, in which a better contact is created between the water used for moisturizing and the substance to be moisturized and which gives a better moisturizing result.
  • the invention is based on feeding the substance to be moisturized into a reaction chamber, into which a compressed gas is blown and liquid in the form of drops is fed as a spray.
  • the compressed air and water are fed, through a shaft arranged on the central axis of the reaction chamber, radially towards the edges of the chamber, while the shaft is simultaneously rotated.
  • the direction of flow is from top to bottom while the substance to be moisturized is fed under pressure over the shaft.
  • compressed air and water are fed into the substance to be moisturized.
  • the feed connection for the substance to be moisturized has a smaller feed cross-sectional surface than the exit connection for the moisturized substance.
  • the liquid is fed to the apparatus in the longitudinal direction of the shaft, along a channel formed in its centre and into the reaction chamber through transverse, preferably radial drill holes.
  • the air is correspondingly fed through channels running parallel to the shaft and preferably from radial, transverse drill holes.
  • the most important advantage of the invention is that reliable moisturizing is ensured and blockage is avoided.
  • the need for maintenance is reduced and, the reliable operation means that breaks in the operation of the moisturizer will not interfere with the processes depending on it.
  • the method is suitable for many different processes, in which there is a need to moisturizing a particulate material.
  • the apparatus is especially intended for the processing of fine-particle dusting substances, but it can also be used to similarly process materials, or mixtures of materials consisting of shavings, chips, or other reasonably light and small pieces.
  • the essential feature is that the solid parts of the material are made to move by the effect of air blown into the reaction chamber. The intention is thus to process a flowing, solid substance.
  • the substance to be moisturized travels by gravity from the top to the bottom, so that the movement of the substance consumes no energy.
  • the mixing result is good, because the material to be mixed is fed onto the top of the mixer element.
  • the construction of the apparatus is simple and the apparatus is easy to open and service. There are few moving parts and they are simple and can be economically changed when necessary.
  • the body of the apparatus forms a tubular reaction chamber 1, with a feed connection 2 formed above it and an exit connector 3 below it.
  • the feed connection 2 is narrower than the diameter of the reaction chamber 1, in order to permit efficient mixing.
  • the feed connection 2 being narrower than the diameter of the reaction chamber ensures that the substance to be mixed will reach the mixer shaft 6.
  • the exit connection 3 is, in turn, preferably at least the size of the diameter of the reaction chamber 1, in order to ensure the smooth exit of the moisturized substance.
  • the minimum requirement is for the feed connection to be above the mixer element and the exit connection 3 to be on the opposite side of the mixer element 6 to the feed connection, so that the openings of the exit connection 3 and the feed connection 2 will be at least partly on top of each other.
  • the body of the apparatus is divided along a dividing line 5 at the central axis 4 of the reaction chamber 1. The apparatus can be opened at the dividing line 5 for cleaning and maintenance.
  • the actual mixing component consists of a mixer shaft 6 arranged on the central axis of the reaction chamber 1.
  • the mixer shaft 6 runs through the end wall 7 of the reaction chamber and the feed-throughs of the shaft 6 are sealed with a seal 8 and the shaft is arranged to be rotated in the reaction chamber 1.
  • a liquid-feed channel 9 from which run radial drill holes 10, which end at the outer surface of the mixer shaft and are set opposite to each other.
  • the drill holes are arranged at an angle of 180° opposite to each other.
  • a liquid feed connection 13 At the first end of the liquid-feed channel 9 and the mixer element 6 is a liquid feed connection 13. The opposite end of the liquid-feed channel 6 is closed.
  • the method and apparatus according to the invention operate in the following marmer.
  • the material to be moisturized for example still hot dusting ash from a power plant, is fed from above through the feed connection 2 to the reaction chamber 1.
  • the direction of flow is thus according to gravity from top to bottom and the substance should flow from the feed connection over the mixer element to the exit connection.
  • the ash is moisturized, in order to finally extinguish and cool it and to prevent it releasing dust in the next processing stage.
  • the mixer shaft is rotated at a speed of about 500 - 600 1/min while compressed air obtained from a normal compressed-air network at a pressure of 3 - 8 bar is fed through the gas holes 12. Water at the factory's raw-water pressure of 2 - 4 bar is fed in turn from the liquid drill holes 10.
  • the water-feed drill holes 10 are dimensioned in such a way that the water being fed forms droplets when it leaves the drill holes 10.
  • the water in the form of drops is distributed evenly over the substance being moisturized, so that the result of the moisturizing is more even and lumping cannot easily occur.
  • Another factor that substantially affects the evenness of the moisturizing is the effect of the large volume of compressed air fed through the compressed-air feed drill holes.
  • the volume of compressed air bulks material being moisturized and being fed through the rotating shaft creates a flow with powerful vortices, which prevents the dusting substance from adhering together and forming lumps due to the effect of water.
  • the compressed air homogenizes the flow of substance and bulks the substance being fed, in order to facilitate its mixing with water.
  • the amount of compressed air must be reasonable, in order to ensure bulking.
  • the dispersion pieces 14 rotate at high speed in the reaction chamber and further mix the flows in the chamber and break up lumps. Their most important function is, however, to keep the walls of the reaction chamber clean by preventing the moisturized substance from sticking to the walls of the reaction chamber.
  • An adjustable amount of water is fed to the reaction chamber.
  • the amount can be adjusted using a simple setting valve.
  • the water pressure must be sufficient to be able to adjust it to form droplets in the water-feed drill holes.
  • the adjustment of the amount in the moisturizing of ash is adjusted in such a way as to stop the release of dust, but liquid water must not come from the moisturizer nor may the ash form sludge. If dust comes from the apparatus, the amount of water is naturally increased while if the ash forms sludge the amount of water is decreased. If it is necessary to adjust the ratio of the liquid to the dusting substance more precisely, measurement and automatic adjustment can be used.
  • the apparatus according to the invention can be manufactured from conventional construction materials, such as carbon steel, stainless or acid-resistant steel, composite materials, or polyethylene. If necessary, its components can be surfaced with rubber, in order to increase wear resistance.
  • the materials selected will of course depend on the materials and operating conditions for which the apparatus is intended.
  • the compressed air and water can be fed from the internal walls of the chamber from nozzles directed upwards against the feed direction of the dusting material.
  • the apparatus is primarily a moisturizer, it can be used as a mixer, particularly for one or more dusting substances and some liquid.
  • an inert gas for instance, can be used as the mixing gas, if the substances being processed demand this.
  • the water-feed channels and air channels in the shaft can be arranged in other ways too and particularly there can be several air channels placed around the water-feed channels.
  • each there is at least one of each, as there are liquid and air feed drill holes too.
  • the drill holes 10, 12 can be arranged directly radially, or at an angle, or some at an angle and some directly radially, in which case flows travelling across each other will be obtained.
  • the dispersion pieces 14 are preferably pin-like, for instance round, but even wing-like pieces can be envisaged in applications, in which there is less danger of adhesion from the substance being moisturized.
  • the cross-sections of the reaction chamber 1 and the feed and exit connections are preferably rotationally symmetrical. Mixing will then function well in the reaction chamber while the connections will be easy to manufacture and attach to the reaction chamber. If these are of some other shape, the feed cross-section of the feed connection should be smaller than that of the reaction chamber and the exit connection.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Paper (AREA)
  • Nozzles (AREA)
  • Forging (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing Of Solid Wastes (AREA)
EP08397504A 2007-02-02 2008-02-04 Method and apparatus for moisturizing dusting material Active EP1955759B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08397504T PL1955759T3 (pl) 2007-02-02 2008-02-04 Sposób i urządzenie do zwilżania pylącego materiału

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20075072A FI120027B (fi) 2007-02-02 2007-02-02 Menetelmä ja laitteisto pölyävän materiaalin kostuttamiseksi

Publications (3)

Publication Number Publication Date
EP1955759A2 EP1955759A2 (en) 2008-08-13
EP1955759A3 EP1955759A3 (en) 2009-02-25
EP1955759B1 true EP1955759B1 (en) 2010-07-28

Family

ID=37832226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08397504A Active EP1955759B1 (en) 2007-02-02 2008-02-04 Method and apparatus for moisturizing dusting material

Country Status (5)

Country Link
EP (1) EP1955759B1 (fi)
AT (1) ATE475475T1 (fi)
DE (1) DE602008001900D1 (fi)
FI (1) FI120027B (fi)
PL (1) PL1955759T3 (fi)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB520966A (en) * 1938-11-04 1940-05-08 T S Kelsey Ltd Improvements in or relating to methods of and means for moistening pulverulent substances
DE1667071B2 (de) * 1967-08-16 1976-11-11 Büttner-Schilde-Haas AG, 4150Krefeld Vorrichtung zum einspruehen einer fluessigkeit in pulverfoermige stoffe oder granulate
CH597926A5 (fi) * 1976-11-26 1978-04-14 Fahrni Peter
DE3137109A1 (de) * 1981-09-18 1983-04-07 Loedige Maschbau Gmbh Geb Verfahren und vorrichtung zum befeuchten von schuettgut
DE3304129A1 (de) * 1983-02-08 1984-08-09 Draiswerke Gmbh, 6800 Mannheim Verfahren und mischer zum kontinuierlichen beleimen von aus holz-spaenen, -fasern od. dgl. bestehendem mischgut
US5246288A (en) * 1992-10-20 1993-09-21 Jetzer James R Mixer, and method for admixing solid particulate
DE4411201A1 (de) * 1994-03-31 1995-10-05 Schuerenberg Beton Spritzmasch Feinstoffwirbelmischer

Also Published As

Publication number Publication date
FI20075072A (fi) 2008-08-03
PL1955759T3 (pl) 2011-01-31
DE602008001900D1 (de) 2010-09-09
FI20075072A0 (fi) 2007-02-02
EP1955759A2 (en) 2008-08-13
EP1955759A3 (en) 2009-02-25
FI120027B (fi) 2009-06-15
ATE475475T1 (de) 2010-08-15

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