AP719A - Apparatus and method for treating a fluid product. - Google Patents

Apparatus and method for treating a fluid product. Download PDF

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Publication number
AP719A
AP719A APAP/P/1996/000884A AP9600884A AP719A AP 719 A AP719 A AP 719A AP 9600884 A AP9600884 A AP 9600884A AP 719 A AP719 A AP 719A
Authority
AP
ARIPO
Prior art keywords
product
discs
shaft
steam
mixing chamber
Prior art date
Application number
APAP/P/1996/000884A
Other versions
AP9600884A0 (en
Inventor
Ernest Badertscher
Paul-Henri Poget
Gerald Bernard
Nadine Tripier
Original Assignee
Nestle Sa
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 Nestle Sa filed Critical Nestle Sa
Publication of AP9600884A0 publication Critical patent/AP9600884A0/en
Application granted granted Critical
Publication of AP719A publication Critical patent/AP719A/en

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Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/16—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials
    • A23L3/18—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C3/00—Preservation of milk or milk preparations
    • A23C3/02—Preservation of milk or milk preparations by heating
    • A23C3/03—Preservation of milk or milk preparations by heating the materials being loose unpacked
    • A23C3/033—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus
    • A23C3/037—Preservation of milk or milk preparations by heating the materials being loose unpacked and progressively transported through the apparatus in direct contact with the heating medium, e.g. steam
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/001—Details of apparatus, e.g. for transport, for loading or unloading manipulation, pressure feed valves
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/16—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials
    • A23L3/18—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus
    • A23L3/22—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus with transport through tubes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/16—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials
    • A23L3/18—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus
    • A23L3/22—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus with transport through tubes
    • A23L3/225—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating loose unpacked materials while they are progressively transported through the apparatus with transport through tubes in solid state

Landscapes

  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Commercial Cooking Devices (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Confectionery (AREA)
  • Dairy Products (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Accessories For Mixers (AREA)

Abstract

The present invention relates to an apparatus and a method for heat treating a fluid product by injection of steam therein in order to provide a -sterilisation, pasteurisation and/or a homogenisation of the product. Said apparatus comprising a mixing chamber comprising a steam injection inlet, a product inlet, and an outlet for the treated product, a rotatable shaft disposed within said mixing chamber, a plurality of discs each comprising at least one product passage opening, said discs being disposed substantially co-axiaily on said shaft, and means, for rotating said shaft with said discs. The invention also relates to a shaft to be used for homogenising and mixing in an apparatus or a process for heating by steam injection a fluid product.

Description

APPARATUS AND METHOD EOR TREATING A FLUID PRODUCT
The present treating a invention relates to an apparatus for fluid such as for sterilising and/or pasteurising and/or homogenising fluid products..
particularly, it relates to an apparatus sterilising, pasteurising and/or homogenising a product by injection of steam into the fluid product.
More for fluid
Direct steam injection is e.g. used in the food industry for pasteurising or sterilising of milk or cereal products. Various types of apparatus for pasteurising or sterilising fluid food products by injection of steam are known. The present invention relates to a method and apparatus wherein steam is injected into a product stream.
Whereas direct steam injection does not raise particular problems for low viscosity fluids such as milk, whey and cream, the pasteurisation of e.g. infant cereal based food, with far higher viscosity, e.g. comprising 20% starch, is very difficult to control in a homogeneous mixing. An inhomogeneous mixing will mean that · temperature varies through the product mass and consequently the product is not homogeneously heat treated. In order to safeguard sufficiently heat treatment of the product i.e. to make sure that all parts of the product mass are heated to a high enough temperature, such as is crucial in pasteurising and sterilising processes, additional steam will need to be injected. This additional steam consumption is expensive and undesirable.
AP/P/ 96/00884
AP . Ο Ο 7 1 9
τ·. *
Homogenisation and mixing may be improved by passing the product through a venturi shaped nozzle in order to increase turbulence and velocity of the product, however, this may not provide a sufficient enough mixing. Alternatively, a. mechanical mixing of the product and the steam may be necessary.
Mixing of the product and steam may be obtained by passing the product through a static mixer. However, substantial wear of the static mixer is likely to result from the; passage of highly viscous products there through. Such static mixer will therefore have to frequently be replaced, which increases production a
costs. Alternatively, a screw may be used for mixing and σ for building up a pressurised product. However, the C product creates a large momentum on the screw when ' c rotated, and hence considerable motor capacity is required for the mixing. c c
The present invention overcomes the above mentioned £ difficulties by utilising a rotatable shaft along which * a plurality of perforated discs comprising product passage openings, are co-axially disposed. Accordingly, the invention provides an improved apparatus and process which accommodates a good mixing and thus a homogeneous heating together with a surprisingly high homogenisation. Among other things, the invention has the following advantages:
• Lowered steam consumption by ensuring a sufficiently homogeneous mixing.
• Improved mixing and homogenising by providing a rotatable shaft along which a plurality of perforated discs comprising product passage openings are coAP. 0 0 7 1 9 axially disposed and by passing the product through said openings while rotating the discs, • Shock effect due to flowing product hitting the discs and the passage of the product through the opening resulting in turbulent flow and mixing, and homogenisation.
• Cutting through the product mass by rotating the discs to increase the homogenisation of the product.
• Reducing motor capacity requirement due to a reduced 10 momentum from the product surrounding the shaft and the disc,.
• Optimising heat distribution by providing an initial homogenising of the product where after the steam is injected and the product and steam are mixing together for a condensation of the steam and a heat transfer to the product.
«
Accordingly, in a first aspect the present invention relates to an apparatus for heat treating a fluid product by injecting steam into the fluid product, said apparatus comprising a mixing chamber comprising a steam injection inlet, a product inlet, and an outlet for the treated product, a rotatable shaft disposed within said mixing chamber, a plurality of discs each comprising at least one product passage opening, said discs being disposed substantially co-axially on said shaft, and means for rotating said shaft with said discs.
It is preferred' that the steam is injected at sonic velocity. This will increase the turbulence in the steam
AP/P/ 9 6 / 0 0 8 8 4
AP. 0 Ο 7 1 9 rrtf-υ and a good mixing is obtained. Sonic velocity of steam can be obtained by letting the fluid pass through a venturi valve while having upstream a pressure with approximately twice that downstream. The steam velocity after the valve will then be about 450 m/sec.
Advantageously, at least on the downstream end of the mixing chamber only a small gap is left between the discs and the mixing chamber walls. This results in substantially the whole product mass passing through the product passage opening in the discs and substantive homogenising of the fluid product and mixing of steam c
and product. Conveniently, at least the downstream part of mixing chamber is substantially cylindrical and the c rotatable shaft is substantially co-axially fitted c within said mixing chamber.
c
One or more steam injectors may be positioned along the £ shaft for injection of steam, via the steam injection £ inlet, into product passing through the mixing chamber. * The rotating shaft with discs will, while the product is pumped through the mixing chamber, .cut the product stream and act as a shock generator such as discussed above. The shaft with discs will, contrary to a screw, not in any substantial way add to the advancing movement of the product through the mixing chamber. The product will be pumped into the chamber and advanced by further product being supplied. The shaft may be provided with replaceable discs or the shaft and discs may be made one part. The shaft may be rotated by any conventional motor.
Depending on the required throughput, heating, mixing and homogenisation, the number of discs and the openings
AP. Ο Ο 7 1 9 therein, may be varied. The more discs provided along the products path from the product inlet to the outlet for the treated product the more homogenising and mixing will be provided. Although the number of discs can be freely chosen for practical purposes the number of discs are from 2 to 20, preferably 5 to 15. The diameter of the product passage openings is preferably in the range from 2 to 10 mm, more preferably 6 mm. This will provide a velocity into the product passage openings between 40 and 200 m/s, preferably 100 m/s.
© : .
In the present context a fluid product is understood to be a solution or suspension, e.g. aqueous, having a viscosity of the order of 1000 to 100.000 mPa.s.
The fluid product is pumped into the mixing chamber through the product inlet. It is preferred that the fluid product is first passed through at the product passage opening(s) in at least one- and preferably 3 20 rotating discs before steam is injected into the product. This gives an initially homogeneous slurry which is then pressed forward and subjected to steam injection heating, mixing, and homogenising.
The homogenising effect is obtained by the shearing of the product passing through the discs' openings. In the particular case of milk-containing products, a good homogenising effect is obtained by the arrangement through shearing of the fatty globules.
The steam injection nozzle is connected to a feed pipe feeding, steam under pressure, preferably between 10 and bar. The product injection nozzle is connected to a feed pipe feeding the fluid product to be treated. The
ΛΡ/Γ.' 9 6 / 0 0 884
AP.00719 outlet from the apparatus is by a back-pressure valve connected to a holding pipe. The back-pressure valve regulates the pressure through the outlet and creates a back pressure in the mixing chamber to maintain the temperature in the mixing chamber. Poor control.of the back pressure results in loss of steam which gives an uneconomic production. The back-pressure valve may advantageously be of the membrane type. Advantageously, two pack-pressure valves may be used e.g. CPM or APC valves from Tetra-Laval.
In another aspect, the invention relates to a method for heat treating a fluid product by injecting steam into α the fluid product, said method comprising the steps of supplying a fluid product into a mixing chamber through a product inlet, injecting steam into said fluid product through a steam injection inlet in said mixing chamber, in which mixing chamber being disposed a rotatable shaft and a plurality of discs each comprising at least one product passage opening, said discs being disposed substantially co-axially on said shaft, while passing at least part of the fluid product through said product passage openings while rotating said shaft with said discs, and discharging the treated fluid product through an outlet in said mixing chamber.
mow n ft
In a further aspect, the invention relates to a shaft to be used for homogenising and mixing in an apparatus or a process for heating by steam injection a fluid product, said shaft comprising a plurality of discs each comprising at least one product passage opening, said
AP. 0 Ο 7 1 9 discs being disposed substantially co-axially on said shaft.
The invention will now be described in greater detail with reference to the accompanying drawings given by way of example showing an embodiment of the invention and in which
Fig. 1 is a schematic illustration of the principle elements of the apparatus according to the invention, and
Fig. 2 ahd Fig. 3 are schematic illustrations of the shaft with discs.
Fig. 1 shows the apparatus 10 according to the invention. The apparatus 10 comprises a mixing chamber 11 defined by walls 21 wherein a steam injection inlet 13, a product inlet 12, and an outlet 16 are formed. A rotatable 'shaft 14 is disposed within said mixing' chamber 11 and mounted in bearings 18 within an intermediate support 22. It is connected to an output rotary shaft 23 of a motor 17 which drives the rotation of the shaft 14. Said motor may e.g. be_ a 1.1 Kw, 1400 t/min motor. A sealing 24 is provided to prevent fluid product from escaping the mixing chamber 11. Said sealing 24 is cooled by means of water supplied via a water inlet 25.
The shaft 14 is provided with a plurality of discs 15. Each disc 15 comprises at -least one product passage opening. The discs are disposed substantially co-axially on said shaft. Fig. 2 shows a perspective view of the discs 15 mounted on the shaft 14. Said discs comprises product passage opening 26. Fig. 3 shows a crossAP/P/ 9 6 / 0 0 8 8 4
AP. Ο Ο 7 1 9 sectional view of the shaft 14 with a disc 15 fitted within the chamber 11.
The flow through the outlet 16 is regulated by means of 5 a back-pressure valve not shown in the drawings., To use the apparatus a steam inlet 13 is be connected to steam injector and a feed pipe for supplying steam under pressure and the product inlet is be connected to a feed pipe and a pump for supplying the fluid product to be treated under pressure. The outlet is preferably connected·' to a holding pipe by the back-pressure valve.
( (
EXAMPLE ( <
/Λ j» 'mA*
The following example illustrates the substantial and surprising steam reduction obtained with the apparatus «
according to the invention when compared with processing of a similar fluid product in a steam injection nozzle i.e. a nozzle wherein both streams of steam and fluid product are injected into a mixing chamber in countercurrency without any further mechanical mixing (S&P injection). The apparatus according to the invention used comprises a shaft with 10 discs. The diameter of the discs was 0 44 mm and each disc had 6 product passage openings of 0 8 mm. The example shows test results of heat treatment of fluid products with varying solid matter content. The products were heated to 140°C:
<
£
C «
AP. Ο Ο 7 1 9
Product Solid matter Ts soup % Steam consumption S&P injection (Kg/Hour) Invention
A 60-62% 320 195
Β 56-58% 330 195
C 58-60% 330 195
D 58-60% 335 200
E 60% 350 215
F 56-58% 355 200

Claims (13)

1. Apparatus for heat treating a fluid product by injecting steam into the fluid product, said apparatus
5 comprising a mixing chamber comprising a steam injection inlet, a product inlet, and an outlet for the treated product, a rotatable shaft disposed within said mixing 10 chamber,
Τ··, a plurality of discs each comprising at least one product passage opening, said discs being disposed substantially co-axially on said shaft, and t
means for rotating said shaft with said discs. (
15 t
2. Apparatus according to claim 1, wherein the apparatus <
comprises a back-pressure valve for regulating the flow through the outlet. c
E
20
3 . Apparatus according to claims 1 and 2, wherein the £ mixing chamber - is substantially cylindrical and the * rotatable shaft is substantially co-axially disposed within said mixing chamber.
25
4 . Apparatus according to claims 1 and 3, wherein at least one disc is disposed between the product inlet and the steam inlet.
•
5. Apparatus according to any of claims 1 to 4, wherein
30 a plurality of steam inlets are positioned along the rotatable shaft.
6. Apparatus according to any of the claims 1 to 5, wherein the apparatus is provided with 5 to 15 discs.
AP . 0 0 7 1 9
7. Apparatus according to any of the claims 1 to 6, wherein each disc is provided with 2 to 50 product passage openings.
8. Apparatus according to any of the claims 1 to 7, wherein the openings have a .diameter in the range from 2 to 10 mm.
10 9. Method for heat treating a fluid product by injecting :7...1 steam into the fluid product, said method comprising the steps of supplying a fluid product into a mixing chamber through a product inlet,
15 injecting steam into said fluid product through a steam injection inlet in said mixing chamber, in which mixing chamber being disposed a rotatable shaft and a plurality of discs each comprising at least one product passage opening, said discs being disposed substantially
20 co-axially on said shaft, while passing at least part of the fluid product through said product passage openings while rotating said shaft with said discs, and *>»»<
discharging the treated fluid product through an
25 outlet in said mixing chamber.
10. A shaft to be used for homogenising and mixing in an apparatus or a process for heating by steam injection a fluid product, said shaft comprising a plurality of
30 discs each comprising at least one product passage opening, said discs being disposed substantially coaxially on said shaft.
APAP/P/1996/000884A 1995-12-22 1996-11-27 Apparatus and method for treating a fluid product. AP719A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95203622A EP0780056A1 (en) 1995-12-22 1995-12-22 Apparatus and method for treating a fluid product

Publications (2)

Publication Number Publication Date
AP9600884A0 AP9600884A0 (en) 1997-01-31
AP719A true AP719A (en) 1999-01-07

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APAP/P/1996/000884A AP719A (en) 1995-12-22 1996-11-27 Apparatus and method for treating a fluid product.

Country Status (20)

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US (2) US5863587A (en)
EP (1) EP0780056A1 (en)
KR (1) KR100302267B1 (en)
CN (1) CN1072916C (en)
AP (1) AP719A (en)
AR (1) AR005198A1 (en)
AU (1) AU718910B2 (en)
BR (1) BR9606136A (en)
CO (1) CO4650024A1 (en)
EG (1) EG21250A (en)
ID (1) ID17114A (en)
MA (1) MA24036A1 (en)
MX (1) MX9606219A (en)
NO (1) NO965500L (en)
PE (1) PE45198A1 (en)
PL (1) PL317637A1 (en)
SG (1) SG77586A1 (en)
TN (1) TNSN96171A1 (en)
TW (1) TW366317B (en)
ZA (1) ZA9610726B (en)

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US5863587A (en) 1999-01-26
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US6120176A (en) 2000-09-19

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