FI70510C - FOERFARANDE FOER VAERMEBEHANDLING AV MJOELK OCH LIKNANDE - Google Patents

Description

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The present invention relates to a method for heat treating milk by means of a heat treatment device in the form of a heat exchanger, in which heat is transferred to milk from water heated to a predetermined temperature. heat from the milk already treated and then fitted with a holding vessel in which the milk is kept for a predetermined time at the temperature reached in the heating heat exchanger.

It has long been known to heat treat milk, etc. 15 to kill bacteria and the like. Such heat treatment usually takes place in dairies and similar establishments to which milk has been transported from producers. However, the increasingly common practice of tank storage, which is intended to rationalize and minimize the number of pick-up trips, has 20 introduced, among other things, the disadvantage of milk being stored for a relatively long time before it is subjected to heat treatment. Despite the cooling of the storage tanks, bacterial growth can occur, which is unacceptable from a hygienic point of view, nor from the point of view of the quality of the milk or milk products. In this context, it can be mentioned that even a very small amount of bacterized goat's milk mixed with a larger amount can render the whole batch of milk unfit for cheese making.

It is an object of the invention to provide a method which reduces the risk of bacterial growth at the earliest possible stage in the treatment chain. The problem is solved according to the invention by directing the milk to the inlet of the heat treatment device and more specifically the regenerative part at a maintained milking temperature directly from the milking equipment.

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An advantage of the invention is that when using the method in connection with a milking device, the energy requirement that would otherwise be required for cooling and reheating can be eliminated, and thus considerable energy savings can be achieved.

By using the method according to the invention in connection with a milking machine, the milk can be heat-treated immediately after milking, whereby the risk of bacterial growth in the storage tank is minimized. As a result, the milk can be stored in the tank for a substantially longer period of time and thus the number of pick-ups can be reduced and the pick-up interval extended. This has the advantage that even small livestock producers can take advantage of the obvious benefits of tank storage. Another advantage of the method according to the invention is that, due to its structure, it requires only a minimal energy supplement.

Another advantage is the fact that the shelf life of the milk treated according to the invention is substantially better than that of milk which has traditionally been first chilled and then taken to a dairy for heat treatment.

The invention will be explained in more detail below with reference to the accompanying drawing, which in a schematic perspective view shows a preferred device example with which the method according to the invention can be implemented.

25 Only the details relevant to the operation of the device have been included in the drawing and, therefore, the components commonly used in the actual operation have been omitted for the sake of clarity.

The device is intended to be connected between the milking machine 3Q m and preferably between the terminal unit or collection tank and the storage tank T which follow it.

The device includes a three-part heat exchanger 1, a holding vessel 2, an electric water heater 3 with a recirculation pump 7 and a thermostatic member 35 and a control device and valves not shown, and is provided with 3 70510 cooling water supply and discharge lines 4,5.

In a preferred embodiment, the heat exchangers are plate heat exchangers in which the heat exchange or transfer takes place on the countercurrent principle.

5 The heating section 6 of the heat exchanger has spaces through which the milk or liquid to be treated flows and spaces separated from the previous plates through which the heated water flows.

The water is heated in the water heater 3 and circulated between it and the heat exchanger part 6 by a pump 7. The water heater is provided with an electric heating element, suitably continuous, to keep the temperature mainly in the desired range and a thermostatically controlled element to set the temperature to the desired exact value.

In contrast to known heat treatment methods, freshly milked milk, i.e. milk that has not been chilled. The milk is thus at a temperature of about 34-37 ° C as it enters the regenerative part of the heat exchanger marked with the number 9 from the supply line 8. At point 10, the milk passes directly through the cooling section 11.

In the regenerative part 9, the milk is heated from a temperature of 34-37 ° C to a temperature of n, 50 ° C because heat is transferred to it from the previously heated milk, which has already passed through the heating part 6 and the flow container 2 placed downstream. From the regenerative part 9, the milk goes to the heating part 6, where it comes into contact with plates heated by hot or hot water and is heated to the desired temperature of about 72 ° C.

3Q The heating of the milk therefore takes place in two stages.

In the first step, heating takes place from an initial temperature of 34-37 ° C to a temperature of the order of 50 ° C by recovering heat from the outgoing milk. In the second stage, heating takes place from about 50 ° C to about 72 ° C by heat transfer 35 from the water heated in the water heater 3.

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In order to reach the target team for the destruction of bacteria or similar microorganisms, the milk is kept at a high temperature for a certain time and therefore a holding vessel 2 is placed in the heating section 6 behind. In this device example 5, the holding vessel consists of a tube or hose coil connected to the outlet pipe 12 of the heating part and leading to a passage pipe 13 which passes across the heating part 6. Due to the helical formation, the length of the holding vessel can be varied according to the prevailing needs. The length of the holding container screw 1Q kan 2 is determined by the flow rate of the milk, i.e. the volume flow of milk per unit time, through the device and the desired holding time.

If the milk is kept at a temperature of 72 ° C for e.g. 15 s, the length of the holding coil 2 can be adjusted so that it takes 15 seconds for a certain amount of milk to pass through the coil,

The holding container is crucial for the operation of the device and it is this that determines the capacity of the device. In other words, by adjusting the length of the coil, the device can be adjusted to suit a certain flow rate, provided that this is possible within the limits of the capacity of the heat exchangers and the water heater.

From the holding coil, the milk is transferred through a through-pipe 13 to a regenerative section, where it transfers heat to the incoming milk before being passed through the cooling section 11, where it is cooled to the desired storage temperature by cooling water coming from line 4 and leaving line 5.

The fact that warm -3d freshly milked milk is already fed into the device and that the heat of the already heat-treated milk is utilized by regenerative heat exchange causes the required energy supplement to remain small.

In this context, it can be said that n, 5 W of power is required per liter of milk treated,

35 The temperature of the milk entering the cooling section 11 is 40 ° C

5 70510 and is cooled to 4-10 ° C.

The line 14 leaving the cooling section 11 can be directly connected to a storage tank known per se, into which the arable is thus cooled to the desired storage temperature. The used cooling water, which has risen to n, 20.r-25 ° C, can be used as drinking water for livestock and / or stored in a special tank from which preheated 10. water is fed to a domestic hot water / hot water tank,

The largest field of application of the method according to the invention is considered to be the treatment of milk in a tank. However, the method can equally well be used in 15 cases where it is desired and possible to distribute milk from the producer directly to consumers / retailers. In this case, the method is applied directly to the milk packaging unit.

The method according to the invention can also be applied to 20 electric vehicles which pick up milk from consumer tanks.

When entering the tank of the vehicle, the milk then automatically becomes heat-treated in connection with the pumping, which means that possibly the so-called the bacterial growth that has begun in the space tank is stopped and bacterial contamination of other milk in the vehicle's tank is prevented.

folds arranged essentially in the same way as in the example case described can be used as such in areas other than milk processing. The method according to the invention can be used e.g. in brewing-30. in industry for the destruction of yeasts and the general pasteurization of beer and similar beverages such as fresh juice (Juice). Also in winemaking, the method according to the invention can be used for precipitating tartar. The method can be used in the engineering industry to "pasteurize" cutting and preferably cutting fluids, allowing them to be re-used several times without the need to add bactericides which may cause skin problems to personnel.

Furthermore, the method can be used for drinking water treatment in developing countries 5, for example.

Claims (2)

1 70510 A method for heat treating milk by means of a heat exchanger in the form of a heat exchanger (6J_), in which heat is transferred to water heated to a certain temperature 5 to which (2), in which the milk is kept at a temperature reached in a heat exchanger for a predetermined time, characterized in that the milk is led directly to the inlet of the heat treatment device and the regenerative part at a maintained milking temperature destruction of milk bacteria and microorganisms.