MXPA96006219A - Apparatus and method for treating a flu product - Google Patents

Apparatus and method for treating a flu product

Info

Publication number
MXPA96006219A
MXPA96006219A MXPA/A/1996/006219A MX9606219A MXPA96006219A MX PA96006219 A MXPA96006219 A MX PA96006219A MX 9606219 A MX9606219 A MX 9606219A MX PA96006219 A MXPA96006219 A MX PA96006219A
Authority
MX
Mexico
Prior art keywords
product
discs
steam
mixing chamber
shaft
Prior art date
Application number
MXPA/A/1996/006219A
Other languages
Spanish (es)
Other versions
MX9606219A (en
Inventor
Badertscher Ernest
Poget Paulhenri
Bernard Gerald
Tripier Nadine
Original Assignee
Societe Des Produits 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
Priority claimed from EP95203622A external-priority patent/EP0780056A1/en
Application filed by Societe Des Produits Nestle Sa filed Critical Societe Des Produits Nestle Sa
Publication of MXPA96006219A publication Critical patent/MXPA96006219A/en
Publication of MX9606219A publication Critical patent/MX9606219A/en

Links

Abstract

The present invention relates to a method for heat treatment of a fluid food product by injecting steam into the fluid food producer, the method comprising the steps of: feeding a fluid food product into a mixing chamber through an inlet of product: to inject a sufficient amount of steam from a steam supplier into the fluid food product through a steam injection inlet in the mixer chamber to heat treat the fluid food product, in which mixing chamber is placed a rotary shaft and a plurality of discs, each comprising at least one coaxial passage opening and the discs are placed substantially on the shaft, contacting the vapor and the fluid food product inside the mixing chamber by passing through at least part of the food product flowing through the product passage openings while g Turn the shaft and discs to heat-treat the product and form a homogenous mixture of the heat-treated fluid product and the steam inside the chamber, and discharge the homogeneous mixture through an outlet in the mixing chamber

Description

APPARATUS AND METHOD FOR TREATING A FLUID PRODUCT DESCRIPTION.
The present invention relates to an apparatus for treating a fluid such as fluid products for sterilization and / or pasteurization and / or homogenization. More particularly, it relates to an apparatus for sterilizing, pasteurizing and / or homogenizing a fluid product by injecting water vapor into the fluid product.
Direct steam injection is used, for example, in the food industry to pasteurize or sterilize milk or cereal products. Various types of apparatus are known for pasteurizing or sterilizing fluid food products by injecting water vapor. The present invention relates to a method and apparatus in which steam is injected into the product stream.
While direct injection of steam does not give rise to particular problems for low viscosity fluids such as milk, whey and cream, the pasteurization of, for example, infant cereal-based foods, which have a very high viscosity, example, comprising 20% starch, it is very difficult to control in a homogeneous mixture. Inhomogeneous mixing will mean that the temperature varies through the mass of the product and consequently, the product is not homogeneously heat-treated. In order to safeguard the sufficiently hot product treatment, that is, ensure that all parts of the product mass are heated to a sufficiently high temperature, as is crucial in the pasteurization and sterilization processes, additional steam will need to be injected . This additional steam consumption is expensive and undesirable.
The homogenization and mixing can be improved by passing the product through a nozzle configured as Venturi, in order to increase turbulence and speed of the product, however, this can not provide sufficient mixing. Alternatively, mechanical mixing of the product and steam may be necessary.
The mixing of the product and steam can be obtained by passing the product through a static mixer. However, it is likely that substantial wear of the static mixer will result from the passage of highly viscous products therethrough. Therefore, these static mixers will often have to be replaced, which increases production costs. Alternatively, a screw may be used to mix and form a pressurized product. However, the product creates a great momentum on the screw when it rotates and therefore a considerable motive capacity is required for the mixing. THE INVENTION The present invention overcomes the difficulties mentioned above, using a rotary axis along which a plurality of perforated discs comprising openings for the passage of the product are coaxially arranged. According to the above, the invention provides an improved apparatus and process that adapts good mixing and therefore homogeneous heating together with a surprisingly high homogenization. Among other things, the invention has the following advantages: * Lower steam consumption, ensuring a sufficiently homogeneous mixing.
* Improved mixing and homogenization, providing a rotating shaft along which are coaxially arranged a plurality of perforated discs comprising through openings and passing the product through those openings while rotating the discs.
* Shock effect because the flowing product hits the discs and the passage of the product through the opening results in a turbulent and mixed flow, and homogenization.
* Cut through the mass of the product by the rotation of the discs, to increase the homogenization of the product.
* Reduction of the capacity requirement of the motor due to a reduced momentum of the product that surrounds the shaft and the disc.
* Optimization of heat distribution, providing an initial homogenization of the product, where after steam injection, the product and steam are mixed together for steam condensation and heat transfer to the product.
In accordance with the above, a first aspect of the invention relates to an apparatus for thermal treatment of a fluid product by injection of steam into the fluid product, this apparatus comprises: a mixing chamber having a steam injection inlet, an inlet for the product and an outlet for the treated product, a rotary shaft arranged inside the mixing chamber, a plurality of discs each comprising at least one hole for the passage of the product, these discs are disposed substantially coaxially on the shaft, and means to rotate the shaft with the discs.
It is preferred that the steam is injected at sonic velocity. This will increase turbulence in the steam and good mixing is obtained. The sonic velocity of the vapor can be obtained by allowing the fluid to pass through a venturi valve while having a pressure upstream of approximately twice as much as downstream. The steam velocity after the valve will then be about 450 m / sec.
Advantageously, at least at the downstream end of the mixing chamber only a small space is left between the discs and the walls of the mixing chamber. This results in substantially all of the dough passing through the through opening of the product of the discs and the substantive homogenization of the fluid product and the mixing of the vapor and the product. Conveniently, at least the downstream part of the mixed chamber is practically cylindrical and the rotary shaft is mounted substantially coaxially within the mixing chamber.
One or more steam injectors may be positioned along the axis for steam injection, via the steam injection port, into the product passing through the mixing chamber. The rotating shaft with its discs will cut, while the product is pumped through the mixing chamber, the product vapor and will act as a shock generator as discussed above. The axis with the discs, contrary to a screw, will not be added substantially to the movement of the product through the mixing chamber. The product will be pumped into the chamber and will advance as long as more product is supplied. The shaft can be provided with replacement discs or the shaft and discs can be made in one piece. The shaft can rotate by any conventional motor.
Depending on the output output, heating, mixing and homogenization required, the number of discs and openings you have may vary. The more discs are provided along the product path from the entry of the product to the outlet for the treated product, a greater homogenization and mixing will be provided. Although the number of discs can be freely selected, for practical purposes, the number of discs will be from 2 to 20, preferably from 5 to 15. Preferably, the diameter of the product through openings are in the range of 2 to 10 mm, more preferably is 6 mm. This will provide a speed within the product through openings of between 40 and 200 m / s, and preferably 100 m / s.
In the present context it is understood that a fluid product is a solution or suspension, for example, 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 first passes through the product opening or openings through at least one and preferably three rotating discs before the vapor is injected into the product. This gives an initially homogenous thick slurry which is then passed forward and subjected to steam injection, heating, mixing and homogenization.
The homogenization effect is obtained by the shearing stress of the product that passes through the disc openings. In the particular case of products containing milk, a good homogenization is obtained by the provision through the cutting effort of the fat globules.
The steam injection nozzle is connected to a supply pipe that supplies steam under pressure, preferably between 10 and 15 bar. The injection nozzle of the product is connected to a feeding tube that supplies the fluid product to be treated. The output of the apparatus is by back pressure valve connected to a support tube. The back pressure valve regulates the pressure through the outlet and creates a back pressure in the mixing chamber to maintain the temperature inside the chamber. Poor control of the back pressure results in steam loss, which results in uneconomical production. The back pressure valve can advantageously be of the membrane type. Advantageously, two back pressure valves can be used, for example the CPM or APC valves obtained from Tetra-Laval.
In another aspect, the invention relates to a method for thermal treatment of a fluid product by the injection of vapor into the fluid product, this method comprises the steps of: supply a fluid product inside the mixing chamber through the product inlet, injecting steam into the fluid product through a steam injection inlet of the mixing chamber, in which mixing chamber is disposed a rotating shaft and a plurality of discs each comprising at least one passage opening for the product, these discs are arranged substantially coaxially on the shaft, while at least part of the fluid product is passed through the openings for the passage of the product, while rotating the shaft with the discs, and discharge the treated fluid product through an outlet of the mixing chamber.
In a further aspect, the invention relates to an axis for use in the homogenization and mixing in an apparatus or a process for heating by steam injection a fluid product, this axis comprises a plurality of discs comprising, each, when less a through opening for the product, these disks are arranged substantially coaxially on the shaft.
The invention will now be described in great detail with reference to the accompanying drawings, given only as an example and showing an embodiment of the invention and in which: Figure 1 is a schematic illustration of the main elements of the apparatus according to the invention, and Figure 2 and Figure 3 are schematic illustrations of the axis with the discs.
Figure 1 shows the apparatus 10 according to the invention, the apparatus 10 comprises a mixing chamber or mixing chamber 11 defined by the walls 21 where a steam injection inlet 13, an inlet for the product 12 and a steam inlet 13 are formed. outlet 16. A rotating shaft 14 is disposed within the mixing chamber 11 and mounted on bearings 18 within an intermediate support 22. It is connected to a rotary output shaft 23 of a motor 17 that drives the shaft 14 in rotation. This motor can be, for example, a motor of 1.1 Kw, 1400 t / min. A seal 24 is provided to prevent the fluid product from escaping from the mixing chamber 11. This seal 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 opening for the passage of product. The discs are arranged almost coaxially on the shaft. Figure 2 shows a perspective view of the discs 15 mounted on the shaft 14. The discs comprise the opening 26 for the passage of the product. Figure 3 shows a section of the shaft 14 with a disc 15 mounted inside the chamber 11.
The flow through the outlet 16 is regulated by means of a back pressure valve not shown in the drawings. For use of the apparatus a steam inlet 13 is connected to the steam injector and a feeder tube for supplying steam under pressure and the product inlet is connected to the feeder tube and a pump for supplying the fluid product to be treated under pressure. Preferably, the outlet is connected to a support tube by the backpressure valve.
EXAMPLE The following example illustrates the substantial and surprising reduction in vapor that is obtained with the apparatus according to the invention, when compared to the processing of a similar fluid product in a steam injection nozzle, ie a nozzle where they inject both streams of fluid product vapor into a countercurrent mixing chamber without any additional mechanical mixing (injection S &P). The apparatus used according to the invention comprises an axis with 10 discs. The diameter of the discs was 044 mm and each disc had 6 openings for the passage of the product of 08 mm. The example shows technical treatment test results of fluid products with a varying solid matter content. The products were heated to 140 ° C.
Product Solid matter Steam consumption (kg / hour) Ts soup% injection S & P Invention A 60-62% 320 2S6 B 56-58% 330 X5 C 58-60% 330 396 D D 5 588--6600 %% 335 2D E 60% 350 26 P 56-58% 355 200

Claims (10)

R E I V I N D I C A C I O N E S.
1. - Apparatus for thermal treatment of a fluid product by injection of steam into the fluid product, this apparatus comprises: a mixing chamber having a steam injection inlet, an inlet for the product and an outlet for the treated product, an axis rotary arranged within the mixing chamber, a plurality of discs each comprising at least one hole for the passage of the product, these discs are disposed substantially coaxially on the shaft, and means for rotating the shaft with the discs.
2 . Apparatus according to clause 1, wherein the apparatus comprises a back pressure valve for regulating the flow through the outlet.
3. Apparatus according to clauses 1 and 2, wherein the mixing chamber is practically cylindrical and the rotary shaft is arranged practically coaxial within the mixing chamber.
4. - Apparatus according to clauses 1 and 3, where at least one disk is arranged between the product inlet and the steam inlet.
5. Apparatus according to any of clauses 1 to 4, wherein a plurality of steam inlets are positioned along the rotary axis.
6. - Apparatus according to any of clauses 1 to 5, wherein the apparatus is provided with 5 to 15 discs.
7. - Apparatus according to any of clauses 1 to 6, wherein each disk is provided with 2 to 50 openings for the passage of the product.
8. Apparatus according to any of clauses 1 to 7, wherein the openings have a diameter in the range of 2 to 10 mm.
9. - Method for thermal treatment of a fluid product by injecting steam into the fluid product, this method comprises the steps of: supplying a fluid product inside the mixing chamber through a product inlet, injecting steam into the fluid product at Through a steam injection inlet of the mixing chamber, in which mixing chamber is disposed a rotating shaft and a plurality of discs each comprising, at least one passage opening for the product, these discs are substantially arranged coaxially on the shaft, while at least part of the fluid product is passed through the openings for the passage of the product, while rotating the shaft with the discs, and discharging the treated fluid product through an outlet of the chamber mixer.
10. - An axis for use in the homogenization and mixing in an apparatus or a process for heating a fluid product by means of steam injection, this axis comprises a plurality of discs each comprising at least one passage opening for the product, these discs are arranged substantially coaxially on the shaft. SUMMARY. The present invention relates to an apparatus and method for thermosetting a fluid product by injecting steam therein in order to provide a sterilization, pasteurization and / or homogenization of the product. This apparatus comprises a mixing chamber comprising an input for steam injection, a product inlet and an outlet for the treated product, a rotary shaft disposed within the mixing chamber, a plurality of discs each comprising at least one opening for the passage of the product, these discs are arranged practically coaxially on the shaft and means for rotating the shaft with the discs. The invention also relates to an axis for use in homogenization and mixing in an apparatus or a process for heating a fluid product by steam injection.
MX9606219A 1995-12-22 1996-12-09 Apparatus and method to treat a fluid product. MX9606219A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP95203622A EP0780056A1 (en) 1995-12-22 1995-12-22 Apparatus and method for treating a fluid product
EP95203622 1995-12-22

Publications (2)

Publication Number Publication Date
MXPA96006219A true MXPA96006219A (en) 1998-04-01
MX9606219A MX9606219A (en) 1998-04-30

Family

ID=8221002

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9606219A MX9606219A (en) 1995-12-22 1996-12-09 Apparatus and method to treat a fluid product.

Country Status (20)

Country Link
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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