WO2012153523A1 - Évaporateur à film liquide tombant - Google Patents

Évaporateur à film liquide tombant Download PDF

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Publication number
WO2012153523A1
WO2012153523A1 PCT/JP2012/003019 JP2012003019W WO2012153523A1 WO 2012153523 A1 WO2012153523 A1 WO 2012153523A1 JP 2012003019 W JP2012003019 W JP 2012003019W WO 2012153523 A1 WO2012153523 A1 WO 2012153523A1
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
coiled wire
falling
liquid
liquid film
Prior art date
Application number
PCT/JP2012/003019
Other languages
English (en)
Japanese (ja)
Inventor
敏 今井
Original Assignee
日曹エンジニアリング株式会社
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 日曹エンジニアリング株式会社 filed Critical 日曹エンジニアリング株式会社
Publication of WO2012153523A1 publication Critical patent/WO2012153523A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
    • B01D1/222—In rotating vessels; vessels with movable parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
    • B01D1/24—Evaporating by bringing a thin layer of the liquid into contact with a heated surface to obtain dry solids

Definitions

  • the present invention relates to a falling film evaporator. More specifically, the present invention is a falling film suitable for a micro-size or millimeter-size manufacturing system that has high evaporation efficiency, can easily remove dried solids and scales accumulated in the evaporator, and can be easily assembled. Relates to an evaporator.
  • Evaporator is used to remove volatiles, concentrate solutions, or fractionate.
  • a falling film type evaporator in which the liquid is formed into a thin film and allowed to evaporate by flowing down the inner peripheral surface of the heating tube or the like, or the container containing the liquid is rotated to remove the liquid from the container.
  • a rotary evaporator or the like is known that is attached to an inner wall surface in a thin film and evaporated.
  • Patent Document 1 As a falling liquid film type evaporator, for example, one in which a number of grooves extending in the vertical direction are formed on the inner peripheral surface of the heating tube (Patent Document 1), and the lower portion of the inner peripheral surface of the heating tube is made bellows (patent) Document 2), one provided with a ring-shaped projection inside the downcomer provided in the heating pipe (Patent Document 3), and one in which a spiral stepped support is brought into contact with the inner peripheral surface of the cylindrical heating pipe ( Patent Document 4) discloses an apparatus in which a large number of microgrooves are provided on the evaporator surface (Non-Patent Document 1).
  • JP 2008-289984 A JP-A-8-89703 JP-A-10-76102 JP-A-6-194073
  • an object of the present invention is to provide a falling liquid film suitable for a micro-size or millimeter-size manufacturing system that has good evaporation efficiency, can easily remove dried solids and scales accumulated in the evaporator, and can be easily assembled. It is to provide a type evaporator.
  • the present inventor has intensively studied to achieve the above object, and when a wire having a specific shape is arranged in the evaporator of the evaporator, the liquid is evaporated while flowing down the inner surface of the evaporator and the surface of the wire in a film form. It has been found that the evaporation efficiency is increased. Furthermore, it has been found that by moving the wire in the evaporator, dried solids and scales deposited on the inner surface of the evaporator and the surface of the wire can be easily removed. The present invention has been completed based on this finding.
  • the present invention includes the following aspects.
  • the falling film evaporator of the present invention has good evaporation efficiency, easy to remove dried solids and scales accumulated in the evaporator, easy to assemble, and suitable for micro-size or millimeter-size manufacturing systems. is there. Further, in the conventional falling liquid film evaporator, various devices are required for the liquid supply port so that the liquid spreads over the entire heat transfer surface. On the other hand, in the falling liquid film type evaporator of the present invention, there is an effect that the liquid spreads uniformly over the entire heat transfer surface by the coiled wire material without special measures for the liquid supply port.
  • the falling film type evaporator of the present invention shown in FIG. 1 has an evaporator 2, a coiled wire 3, and a heating means 4, and the coiled wire 3 is installed in the evaporator 2.
  • the falling liquid film evaporator 1 shown in FIG. 1 includes a condenser 5, a liquid container 6, a pump 7, a concentrate receiving container 8, a volatile content receiving container 9, and a mist separator 10. It is attached.
  • the evaporator 2 shown in FIG. 1 consists of a container whose internal space is a columnar shape.
  • the evaporator constituting the present invention is not limited to a container having a cylindrical inner space.
  • a container having a cylindrical inner space is preferable in that the liquid easily spreads on the inner surface of the evaporator and the liquid can be heated uniformly.
  • the inner surface of the evaporator is preferably smooth in that there are few sticking matters and it is easy to remove the sticking matters.
  • the thickness and material of the evaporator can be appropriately selected from the viewpoints of strength, thermal conductivity, corrosion resistance, heat resistance, and the like.
  • titanium metal titanium-based alloy, nickel-based alloy (for example, Hastelloy (registered trademark); Inconel (registered trademark)), cobalt-based alloy (for example, Stellite (registered trademark)), stainless steel, etc.
  • Hastelloy registered trademark
  • Inconel registered trademark
  • cobalt-based alloy for example, Stellite (registered trademark)
  • stainless steel etc.
  • the thing which consists of these alloys is mentioned. Especially, what consists of an alloy is preferable at the point of thermal conductivity.
  • a coiled wire 3 shown in FIG. 1 is formed by winding a wire in a coil shape.
  • the shape of the coiled wire is not particularly limited as long as it has a coil outer diameter substantially equal to the inner diameter of the evaporator 2.
  • a cylindrical coiled wire having a constant coil outer diameter can be used.
  • a frustoconical inner space a frustoconical coiled wire can be used.
  • a cylindrical coil-shaped wire having a constant coil outer diameter is preferable in that it is easy to remove dried solids and scales accumulated in the evaporator and is easy to assemble.
  • the number of turns, the wire diameter, the free length, the winding direction and the like of the coiled wire are not particularly limited, and can be appropriately selected from the viewpoint of liquid separation ability, evaporation ability, and the like.
  • the coiled wire may be closely wound or pitch wound. In the case of pitch winding, the pitch is not particularly limited, and may be equal pitch or unequal pitch.
  • the material of the coiled wire can be appropriately selected from the viewpoints of strength, thermal conductivity, corrosion resistance, heat resistance, and the like. Examples of the coiled wire material include the materials exemplified in the description of the evaporator.
  • the coiled wire 3 is installed in the evaporator 2.
  • the coiled wire 3 is installed over the entire range from the top to the bottom of the evaporator 2, but is not limited thereto.
  • it can be installed in a range only on the bottom side of the evaporator and can be installed in a range only on the top side.
  • the coiled wire is close to the evaporator inner surface at an interval of contact or not.
  • a spiral channel-like space is formed between the inner surface of the evaporator and the coiled wire.
  • a spiral groove gap is formed inside the coiled wire.
  • the coiled wire is preferably movable in the evaporator.
  • the inner surface of the evaporator is rubbed by the coiled wire, and dried solids and scales can be peeled off.
  • the coiled wire can be taken out from the evaporator.
  • the heating means 4 shown in FIG. 1 is a heat medium jacket.
  • the heating means constituting the present invention is not limited to the heat medium jacket, and may be an external heating type heating means or an internal heating type heating means.
  • Examples of the external heating method include a method of installing a heat medium jacket as shown in FIG. 1 and a method of installing a heating wire on the outer surface of the evaporator.
  • As an internal heating method a method of flowing a heating medium through a coiled wire (a tube wound in a coil shape), a method of installing a heating wire in an evaporator, a method of using a coiled wire itself as a heating wire, And a method of installing a heat source.
  • an external heating type heating means is preferable, and a heat medium jacket is particularly preferable.
  • the heating means of the external heating method may be installed in the entire outer surface range of the evaporator or in a partial range.
  • the heating temperature by the heating means is not particularly limited as long as the volatile component evaporates. However, if the heating temperature is too high, dry matter or scale may be generated, and if it is too low, evaporation may be insufficient. Further, the inside of the falling liquid film evaporator can be decompressed and the liquid can be evaporated by low-temperature heating.
  • the liquid can be evaporated while flowing down the inner surface of the evaporator 2 and the surface of the coiled wire 3 into a film shape.
  • the liquid flows down along a spiral channel-shaped space formed between the inner surface of the evaporator and the coiled wire or a groove-shaped space formed inside the coiled wire, and the entire inner surface of the evaporator Therefore, the heat transfer area increases and high evaporation efficiency can be obtained.
  • the liquid can be supplied from the uppermost part of the coiled wire or can be supplied from an intermediate part.
  • the liquid to be evaporated is supplied from the liquid container 6 by the pump 7 into the evaporator 2 through the liquid supply port 2-1 on the side surface of the evaporator 2. It is not limited to this.
  • the liquid may be supplied from the top of the evaporator 2.
  • a preheater may be installed in front of the evaporator 2 to heat the supplied liquid to a desired temperature.
  • the method for discharging the volatile matter is not particularly limited, but in the system shown in FIG. 2, the volatile matter is discharged from the top of the evaporator 2.
  • the mist is returned to the evaporator 2 in the mist separator 10 installed at the top of the evaporator 2.
  • Volatile components are liquefied in the condenser 5 installed at the top and collected in the volatile component receiving container 9.
  • the condenser include a double-pipe type, a multi-pipe type, a coil type, a plate type, a plate fin type, a spiral type, and a jacket type.
  • the liquid not evaporated from the lower portion of the evaporator 2 is discharged and collected in the concentrate receiving container 8.
  • the top of the evaporator 2 is sealed. Volatiles and liquid that has not been evaporated are discharged from the bottom of the evaporator 2 to the concentrate receiving container 8. The liquid that has not been evaporated accumulates in the bottom of the container 8. Volatile components are extracted from the upper part of the concentrate receiving container 8 as it is and liquefied in the condenser 5. The liquefied volatile matter is collected at the bottom of the volatile matter receiving container 9 and collected.
  • Example 1 An evaporator made of a stainless steel circular tube (20A, SUS304 Sch80) having a height of 270 mm was prepared. An exhaust port was installed on the top of the evaporator, a liquid supply port was installed on the side of 260 mm in height, and a drain port was installed on the bottom of the evaporator. A mist separator 10 was installed at the exhaust port. A cylindrical heat medium jacket (40A, SUS304TP Sch20S, 230 mm) was installed on the outer surface of the evaporator over a range from the bottom of the evaporator to 230 mm in height.
  • a coiled wire (number of windings: 66, wire diameter: 2 mm, free length: 233 mm, winding direction: S winding, pitch: 3.5 mm, material: SUS304) is inserted into the evaporator, and the height from the bottom of the evaporator A falling liquid film evaporator was assembled by installing over a range up to 233 mm. Steam at a temperature of 130 ° C. was passed through the heating medium jacket of the falling film evaporator. Water was supplied from the liquid supply port at flow rates of 29 ml / min, 38 ml / min, and 48 ml / min, respectively. Evaporation operation was performed with the pressure in the evaporator at atmospheric pressure.
  • Example 1 A falling liquid film evaporator was assembled in the same manner as in Example 1 except that the coiled wire was not inserted into the evaporator. Steam at a temperature of 130 ° C. was passed through the heating medium jacket of the falling film evaporator. Water was supplied from the liquid supply port at flow rates of 10 ml / min, 29 ml / min, 36 ml / min, and 48 ml / min, respectively. Evaporation operation was performed with the pressure in the evaporator at atmospheric pressure. The overall heat transfer coefficient at each flow rate was calculated. The results are shown in FIG. When the flow of water was observed with a glass model device of the same size and structure as the falling film evaporator, the water was flowing down a part of the inner surface of the evaporator in a thin streak-like flow. .
  • the falling liquid film evaporator of the present invention in which the coiled wire is arranged has an overall heat transfer coefficient about 5 times higher than that of the falling liquid film evaporator in which the coiled wire is not arranged, and the evaporation efficiency. I understand that is good.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

Cette invention concerne un évaporateur à film liquide tombant comprenant un évaporateur constitué d'un récipient ayant un espace interne de forme cylindrique, d'un matériau filaire enroulé de forme cylindrique ayant un diamètre d'enroulement extérieur essentiellement identique au diamètre intérieur de l'évaporateur, et d'un moyen de chauffage tel qu'une chemise à milieu chauffant. L'élément filaire enroulé est placé mobile à l'intérieur de l'évaporateur, et un liquide peut être évaporé en tombant sous forme de film sur la surface intérieure de l'évaporateur et la surface du matériau filaire enroulé. L'évaporateur à film liquide tombant selon l'invention, qui peut être utilisé dans des systèmes de fabrication de l'ordre du micron et du millimètre, est caractérisé par une excellente efficacité d'évaporation, un retrait facile du matériau séché et du tartre qui s'est déposé à l'intérieur du récipient de l'évaporateur et un assemblage simple.
PCT/JP2012/003019 2011-05-09 2012-05-09 Évaporateur à film liquide tombant WO2012153523A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-104733 2011-05-09
JP2011104733 2011-05-09

Publications (1)

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WO2012153523A1 true WO2012153523A1 (fr) 2012-11-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3533509A1 (fr) * 2018-02-26 2019-09-04 Ebara Corporation Système de réduction de l'humidité
US11634684B2 (en) 2019-04-09 2023-04-25 Indian Oil Corporation Limited Integrated process for ethanol separation from fermented broth for low temperature applications

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5888001A (ja) * 1981-11-21 1983-05-26 Jiro Sasaoka 流下膜熱装置とその発熱体

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5888001A (ja) * 1981-11-21 1983-05-26 Jiro Sasaoka 流下膜熱装置とその発熱体

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3533509A1 (fr) * 2018-02-26 2019-09-04 Ebara Corporation Système de réduction de l'humidité
US11400406B2 (en) 2018-02-26 2022-08-02 Ebara Corporation Wet abatement system
US11634684B2 (en) 2019-04-09 2023-04-25 Indian Oil Corporation Limited Integrated process for ethanol separation from fermented broth for low temperature applications

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