WO2015040175A1 - Procédé et dispositif pour extinction de mousse - Google Patents

Procédé et dispositif pour extinction de mousse Download PDF

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Publication number
WO2015040175A1
WO2015040175A1 PCT/EP2014/070027 EP2014070027W WO2015040175A1 WO 2015040175 A1 WO2015040175 A1 WO 2015040175A1 EP 2014070027 W EP2014070027 W EP 2014070027W WO 2015040175 A1 WO2015040175 A1 WO 2015040175A1
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WO
WIPO (PCT)
Prior art keywords
foam
liquid
pressure
extinguisher
downstream
Prior art date
Application number
PCT/EP2014/070027
Other languages
English (en)
Inventor
Tomas Skoglund
Fredrik Innings
Göran Pantzar
Original Assignee
Tetra Laval Holdings & Finance S.A.
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 Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Publication of WO2015040175A1 publication Critical patent/WO2015040175A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/02—Foam dispersion or prevention
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0036—Flash degasification

Definitions

  • the present invention relates to separation and extinguishing of foam, in particular in relation to deaeration systems.
  • liquid foodstuff liquid or “product” will be used in the following
  • Air content may affect the taste, colour and shelf-life of the final product, and therefore the liquid is deaerated.
  • deaeration is well known, and it may be used for other liquids than liquid foodstuff, which is also true for the application of the present invention as it will be described in the present specification.
  • the liquid to be deaerated is introduced into a deaeration vessel, which also may be referred to as a "separation vessel" since it is used to separate deaerated liquid from the deaerated gas.
  • a deaeration vessel which also may be referred to as a "separation vessel” since it is used to separate deaerated liquid from the deaerated gas.
  • the pressure is very low, to the extent that for the prevailing temperature the pressure is so low that the liquid starts to boil.
  • a condensation unit may be arranged, such that the liquid contained in the steam is returned to the bulk of liquid being deaerated.
  • Foam may be formed as a result of different processes and different liquids will behave differently, yet two common effects are that the foam either is generated as it is introduced to the deaeration vessel, or as a result of the boiling.
  • the generated foam will be prone to follow the gases out through the vacuum exit, either by being entrained in the flow or simply since so much foam is generated so that a top portion is pushed into the vacuum exit.
  • the foam comprises gas but also liquid, and any foam leaving through the vacuum exit corresponds to a loss of liquid, i.e. product. Wasting product in this way has the direct and obvious effect of lost product, but it also results in an increased load on purification plants. Extinction of foam with the purpose of preventing it from leaving the separation vessel is thus an issue to consider.
  • the present invention aims at providing an improved method and device for extinguishing and/or separating foam.
  • the present invention relates to a method of extinguishing foam, comprising the steps of, from a deaeration vessel having a first pressure containing deaerated liquid and foam generated by the deaeration, removing the foam from the separation vessel by application of suction, extinguishing the foam in a foam
  • the inventive idea of treating the foam in isolation reduces the energy consumption significantly, and at the same time it reduces the amount of processing of the liquid inside the separation vessel.
  • the method further comprises the step of reintroducing the resulting liquid, via a return line, to a flow of deaerated liquid leaving the separation vessel though an outlet.
  • the method may further comprise the step of arranging a separator downstream the foam extinguisher to facilitate the separation of deaerated liquid and gases.
  • the method further comprises a step of arranging thermal insulation to an arrangement leading the foam to the foam extinguisher and/or arranging heat insulation to a return line so as to further reduce the energy consumption of the process.
  • a step of, in the foam extinguisher, passing the removed foam over a flow restriction inducing a pressure drop from the first pressure residing in the separation vessel to a second pressure is included.
  • the second pressure may correspond to a pressure 0-10 °C below the boiling temperature, such as to induce a flash boil in the foam
  • the method may further comprise the step of passing the removed foam through a heat exchanger thus increasing the temperature of the removed foam, inducing a boil of the foam.
  • the present invention relates to a device for processing a liquid, comprising a separation vessel adapted to contain partly or fully deaerated liquid and foam, an outlet for removal of deaerated liquid and an arrangement for evacuating released gases and foam, wherein a foam extinguisher is arranged downstream the vacuum exit and wherein a return line is arranged to lead resulting liquid from the foam extinction to a position downstream the outlet.
  • the device comprises the necessary components to be able to perform the inventive method.
  • the dependent claims also harmonize to a great extent with the dependent method claims in terms of components added.
  • the arrangement for evacuation of released gases and foam and/or the return line may be provided with thermal insulation.
  • a vortex breaker may be arranged downstream the outlet.
  • the foam extinguisher may comprise an expansion valve, and a second pressure downstream the expansion valve corresponds to a pressure 0-10 °C below the boiling temperature, such as to induce a flash boil in the foam.
  • the second pressure resides in the interval 0-5 °C below the boiling point.
  • the foam extinguisher may comprise a heat exchanger arranged to heat the foam to crack bubbles of the foam.
  • the heat exchanger is arranged to have a downwards inclination in the downstream direction, whereby liquid generated by foam extinction will flow in the downstream direction. Though not necessary, this arrangement renders the use of an additional pump obsolete.
  • Fig. 1 is a schematic layout of a first embodiment of the present invention.
  • Fig. 2 is a partial view of a second embodiment of the present invention.
  • Fig. 3 is a partial view of a third embodiment of the present invention.
  • Fig. 1 there is shown a general layout of a device 100 involving a first embodiment of the present invention.
  • the pressure Po may generally be elevated in the feed line 102, compared to atmospheric in general and compared to a first pressure Pi inside the separation vessel 104 in particular.
  • the first pressure Pi inside the separation vessel 104 very low typically residing in an area of 0-10 °C above the boiling point (again meaning that if the temperature of the liquid in the separation vessel increased by 0-10 °C the liquid would start to boil).
  • the pressure Pi may be 0-5 °C above the boiling point, or the lower part of the interval may even vary between 0.1-1 °C above the boiling point to ensure that no boiling occurs.
  • a nucleation valve 106 or, using a more general expression, an expansion valve 106 separates the feed line 102 from the separation vessel 104, and as the product passes the expansion valve 106 it will experience a sudden pressure drop from P 0 to Pi, inducing a flash boil or to the generation of gas bubbles, thus causing an abrupt start of deaeration. As the product enters the separation vessel the partly deaerated product 108 will collect at the bottom of the separation vessel 104 while the released gases 1 10 will reside in the remaining part of the vessel 104.
  • An interface surface is depicted by a delimiter line 1 12.
  • the deaerated product 108 will be pumped out through an exit 1 14 at the bottom of the vessel 104 and the gases will be evacuated through an arrangement 1 16 in the top of the separation vessel.
  • the arrangement 1 16 may suggestively be driven by a vacuum pump (not shown) arranged downstream.
  • the arrangement 1 16 may in the present embodiment merely comprising a pipe extending from the separation vessel 104.
  • a side effect of the quite violent deaeration process is that considerable amounts of foam, indicated at 1 18, will be generated, a side effect that is unwanted for several reasons, as previously mentioned in the background section.
  • Extinguishing of the foam may merely imply that the foam is separated from the rest of the product flow, yet in most cases it is desired to extinguish the foam such as to capture the product bound thereto. In that sense the present application will relate to both separation of foam (from product) and to extinguishing of foam.
  • any foam 118 is allowed to be extracted from the separation vessel 104 as the gases are evacuated.
  • the gases and bubbles enter a foam extinguisher 120.
  • This foam extinguisher 120 bursts the bubbles 118 and separates the gas from the product, according to any method known in the art.
  • the arrangement 116 is provided with thermal insulation 130 such that the temperature of the foam 118 does not drop.
  • the gas continues towards the vacuum pump, the path indicated with V, while the product follows the path R, a return line 122 bringing it back to a position downstream the exit 114 from the separation vessel 104.
  • the return line 122 may debouch downstream the exit 114 yet upstream a pump 124 used to pump the deaerated liquid onward in the process.
  • a vortex breaker 132 may be arranged downstream the exit 114 to prevent any vortex from being generated inside the separation vessel 104.
  • a simple design for a vortex breaker is a pipe segment having a pair of baffle plates in a cross arrangement in the longitudinal direction thus creating four longitudinal compartments. There are other more or less elaborate designs for vortex generators which could be used.
  • the return line 122 comprises either of a return valve or, a pump (such as a liquid ring pump) 136, ensuring that the liquid level in the return line 122 is controlled.
  • a pump such as a liquid ring pump
  • Another alternative, which may be used in combination with the other ones or as a solitary solution is to use an ejector 134 to entrain the liquid from the return line 122 in a downstream direction.
  • the liquid used to feed the ejector 134 may be collected downstream the pump 124 and in applications where the pressure downstream the pump 124 is sufficient no further feed means are necessary.
  • the need of a regulation valve or a feed pump may be called for to provide an adequate feed to the ejector 134.
  • a foam extinguisher according to Fig. 2 may be utilized.
  • the foam and gas enters the foam extinguisher 220 through an expansion valve 221, and the decrease in pressure will expand the bubbles such that they burst.
  • the second pressure P 2 after the expansion valve is 0-10 °C below the boiling point, such as to induce a flash boil of the foam, which will result in the bubbles expanding and bursting after which the resulting liquid may be separated from the gas.
  • the second pressure P 3 may be modulated by a vacuum pump (not shown) arranged downstream, also responsible for evacuating the gases from the separation vessel 104.
  • a thermal insulation of the arrangement 116 is particularly important, otherwise it may be difficult or at least associated with a significant energy load to obtain a low enough pressure.
  • the return line 222 also denoted R as in the first example
  • the gases will exit through the vacuum line V.
  • it may comprise a cyclone separator 224 in which the stream of gas and product enters about tangentially at a speed, binding the product to the walls of the cyclone separator 224 and allowing for the gas to be collected in the middle.
  • the cyclone is schematically depicted in Fig. 2 the use of it is optional as a measure of improving the separation efficiency. Also, any other type of suitable separator may be used. Any of the embodiments disclosed in relation to Fig. 2 or Fig. 3 to follow, may be combined with the embodiments of Fig. 1.
  • Fig. 3 illustrates yet a further embodiment of the present invention and the related foam extinguisher 320.
  • the foam extinguisher 320 of the third embodiment comprises a heater 326 or a heat exchanger by means of which the stream comprising the extracted bubbles and evacuated gas is heated. An effect of the heating is that the foam will boil, the bubbles will burst, and the liquid will be separated from the gas.
  • the heat exchanger 326 has an inlet 328 and an outlet 330. With the suggested arrangement the foam may be subjected to a targeted boil, which reduces the energy consumed in foam extinguishing process.
  • the heat exchanger should be arranged close to the separation vessel 104, and in particular the outlet 330 from the heat exchanger (or) should be arranged close to the exit 114 of the separation vessel 104 in order to minimize pressure drop. It is also preferred to arrange the heat exchanger such that it has a downward inclination downstream, whereby the resulting product (liquid) will be forced by gravity towards the outlet 330, while the gas follows a vacuum stream out of the device. The product will similarly to the other embodiments follow the return line R and combine with the deaerated product leaving the separation vessel 104 through the exit 114, the flows meeting downstream the exit 114.
  • the heat exchanger and in particular the separation point where the gas and liquid separates may preferably be arranged above a liquid level in the deaeration vessel.
  • the pipes leading to the heat exchanger 326 are provided with a thermal insulation, as well as the pipes leading from the heat exchanger.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

Procédé d'extinction de mousse comprenant les étapes consistant, dans une cuve de séparation présentant une première pression (P1) contenant un liquide désaéré et de la mousse, à retirer la mousse de la cuve de séparation par application d'aspiration, à éteindre la mousse dans un extincteur à mousse, à séparer le liquide obtenu et le gaz, à réintroduire le liquide obtenu dans le liquide désaéré.
PCT/EP2014/070027 2013-09-23 2014-09-19 Procédé et dispositif pour extinction de mousse WO2015040175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1351093-8 2013-09-23
SE1351093 2013-09-23

Publications (1)

Publication Number Publication Date
WO2015040175A1 true WO2015040175A1 (fr) 2015-03-26

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Family Applications (1)

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PCT/EP2014/070027 WO2015040175A1 (fr) 2013-09-23 2014-09-19 Procédé et dispositif pour extinction de mousse

Country Status (1)

Country Link
WO (1) WO2015040175A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3332652A1 (fr) * 2016-12-12 2018-06-13 Tetra Laval Holdings & Finance S.A. Appareil et procédé de débullage d'un liquide alimentaire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1485974A (en) * 1973-09-06 1977-09-14 Schering Ag Apparatus comprising means for the destruction of foam
DE20015881U1 (de) * 2000-09-14 2001-03-08 Henkell & Soehnlein Sektkeller Vorrichtung zur Beeinflussung des Schaumverhaltens von Flüssigkeiten, insbesondere kohlendioxidhaltiger Getränke
US20060191417A1 (en) * 2005-02-25 2006-08-31 Setsuo Hotani Defoaming apparatus
US20080254181A1 (en) * 2003-10-21 2008-10-16 Rex Allan Mason Anti-Foaming Device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1485974A (en) * 1973-09-06 1977-09-14 Schering Ag Apparatus comprising means for the destruction of foam
DE20015881U1 (de) * 2000-09-14 2001-03-08 Henkell & Soehnlein Sektkeller Vorrichtung zur Beeinflussung des Schaumverhaltens von Flüssigkeiten, insbesondere kohlendioxidhaltiger Getränke
US20080254181A1 (en) * 2003-10-21 2008-10-16 Rex Allan Mason Anti-Foaming Device
US20060191417A1 (en) * 2005-02-25 2006-08-31 Setsuo Hotani Defoaming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3332652A1 (fr) * 2016-12-12 2018-06-13 Tetra Laval Holdings & Finance S.A. Appareil et procédé de débullage d'un liquide alimentaire

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