JP2010207137A - System and method for controlling stored liquid temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for controlling a stored liquid temperature which enables equation of a stored liquid temperature and highly accurate temperature stability, performs temperature control easily at a low cost, and simplifies facilities. <P>SOLUTION: The system for controlling the stored liquid temperature has a heat treatment tank 2 for storing a heating solution L made by mixing a hydrated organic substance with water, a taking-in-and-out device 3 for soaking an object to be heated W in the heating solution L in the heat treatment tank 2 and taking out the object W after a prescribed time, a boiling means 4 for boiling the heating solution L in the heat treatment tank 2, a liquid temperature detecting part 6 for detecting a boiling temperature of the heating solution L in the heat treatment tank 2, and a replenishment controlling part 7 for replenishing an organic matter or water to the heat treatment tank 2 as necessary, based on the detected temperature of the liquid temperature detecting part 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a storage temperature management system and a storage temperature management method.

  An apparatus for processing food (heating cooking) by immersing the food in a processing tank storing a high-temperature liquid is well known (for example, see Patent Document 1). In this type of apparatus, assuming that the temperature of the high-temperature liquid stored in the processing tank is kept constant, as a method for realizing this, for example, the heating time is controlled (see Patent Document 2, etc.) ), A method of changing the mixing ratio by controlling on-off valves or the like provided in each pipe for supplying high-temperature water or low-temperature water (see Patent Document 3, etc.).

JP 2005-177138 A JP 2002-260086 A JP-A-61-223435

In order to keep the temperature control of the liquid stored in the treatment tank constant, the method of controlling the heating time has a problem that it is difficult to achieve uniform temperature distribution because convection hardly occurs in the liquid. In addition, it takes a long time to raise the temperature (poor control responsiveness), resulting in poor efficiency and low accuracy to match the target temperature, and high running costs. .
On the other hand, the method of changing the mixing ratio depending on the amount of high-temperature water and low-temperature water supplied to the treatment tank has problems that the control circuit and system are complicated and that the equipment becomes large. In addition, there is also a problem that there is a lot of waste in that the increased amount of water in the treatment tank must be drained.

  The present invention has been made in view of the above circumstances, and it is possible to make the storage temperature uniform and to stabilize the temperature with high accuracy, and the temperature control is simple, low cost, and simple in terms of equipment. It is an object of the present invention to provide a liquid storage temperature management system and a liquid storage temperature management method that can be realized.

In order to achieve the above object, the present invention has taken the following measures.
That is, the storage temperature management system according to the present invention includes a heat treatment tank for storing a heating solution in which a hydratable organic substance and water are mixed, and an object to be heated in the heating solution in the heat treatment tank. A device to be immersed and taken out after a predetermined time, a boiling means for boiling the heating solution in the heat treatment tank, a liquid temperature detection unit for detecting the boiling temperature of the heating solution in the heat treatment tank, and the liquid temperature detection unit And a replenishment control unit that can replenish organic matter or water into the heat treatment tank as required based on the detected temperature.

In the system having such a configuration, first, as a general rule, the heating solution stored in the heat treatment tank is kept in a boiling state by the boiling means, so that the heating solution is maintained at the boiling temperature. Will be drunk. In addition, the temperature distribution becomes uniform because the heating solution receives a stirring effect due to the boiling state.
Based on this condition, the liquid temperature detector monitors whether the boiling temperature of the heating solution deviates from the set temperature, and anticipates that the boiling temperature deviates from or deviates from the set temperature. The replenishment control unit replenishes organic matter or water into the heat treatment tank. Note that the boiling temperature of the heating solution is linked (temperature change) due to the evaporation or volatilization of the organic matter or water contained in the heating solution, and the mixing ratio of both changes.

Therefore, the boiling temperature as the heating solution can be adjusted to the target set temperature by returning the mixing ratio of both to the original proper state by replenishing organic matter or water. While heating such organic matter or water, the heating solution is always
Since the boiling state is maintained, the effect of uniform temperature distribution is always obtained.
As is clear from this, the storage temperature management system according to the present invention does not control the heating time of the heating solution, and the mixing of the high temperature heating solution and the low temperature heating solution is not performed. It's not like changing the ratio by valve operation. Therefore, the conventional problems caused by performing the heating time control and the valve operation control can be solved at once.

In addition, the storage temperature management system according to the present invention can make the storage temperature uniform and stabilize the temperature with high accuracy. Moreover, the temperature control is simple, low cost, and simplified in equipment. The advantage that it can be obtained.
In the storage temperature management system according to the present invention, the object to be heated is not limited at all. Also, the organic substance is not particularly limited and can be appropriately selected according to various conditions such as the material of the object to be heated, the purpose of use (heating), the target set temperature, and the running cost.

As a specific example, the replenishment control unit allows water to be supplied into the heat treatment tank when the temperature detected by the liquid temperature detection unit deviates from or deviates from the set temperature set in the heat treatment tank. What is necessary is just to have a means.
In this case, the water supply means of the replenishment control unit automatically supplies water into the heat treatment tank in anticipation that the detected temperature of the liquid temperature detection part deviates or deviates from the set temperature set in the heat treatment tank. What is necessary is just to have the water supply control part for stopping the water supply of a water supply means automatically, when starting, and when the detection temperature of a liquid temperature detection part reaches preset temperature or semi-setting temperature after water supply start. In this way, automation is possible.

Here, the “set temperature” refers to the finally reached target temperature, and the “semi-set temperature” refers to a temperature that anticipates overshoot, that is, slightly before the finally reached target temperature (arrival). Even if the water supply is stopped immediately before the temperature), the temperature is predicted to reach the ultimate temperature due to the subsequent temperature rise (a certain temperature range is allowed).
The water supply means of the replenishment control unit continuously supplies water into the heat treatment tank within a range that replenishes the amount of evaporation or volatilization of the heating solution in the heat treatment tank by boiling, and the temperature detected by the liquid temperature detection unit is the heat treatment. When the set temperature set in the tank is deviated or in anticipation of deviating, the amount of water supplied to the heat treatment tank is automatically increased, and the temperature detected by the liquid temperature detector is set to the set temperature or semi-set after the start of water supply. A water supply control unit for automatically reducing or stopping the water supply amount of the water supply means when the temperature is reached may be provided.

In the liquid storage temperature management system according to the present invention, the loading / unloading device can be a food conveyor.
On the other hand, the storage temperature management method according to the present invention stores a heating solution in which a hydratable organic substance and water are mixed in a heat treatment tank and heats the heating solution to boil the heating solution. After confirming that the temperature has reached a predetermined set temperature, the heating state is managed so that the boiling state of the heating solution is maintained while the object to be heated is immersed in the heating solution and repeatedly taken out after a predetermined time. The boiling temperature of the heating solution is monitored, and when the boiling temperature of the heating solution deviates from or exceeds the set temperature, the boiling point of the heating solution is replenished by supplying organic matter or water into the heat treatment tank. Keep the temperature at the set temperature.

With such a management method, by adjusting the replenishment amount of organic matter or water, the boiling temperature of the heating solution can be adjusted to the set temperature, so that the liquid storage temperature can be made uniform and highly accurate. Temperature stabilization is possible. In addition, there is an advantage that temperature control can be easily performed at low cost, and can be simplified in terms of equipment.
The liquid storage temperature management method according to the present invention is a heat treatment in which an object to be heated is a food before heating and an organic substance is glycerin, and the boiling temperature of the heating solution deviates from or deviates from a set temperature. It can be implemented as replenishing water into the tank.

The liquid storage temperature management system and the liquid storage temperature management method according to the present invention are capable of uniform liquid storage temperature and highly accurate temperature stabilization, and can be easily and inexpensively controlled in temperature, and are also equipped with facilities. Can also be simplified.

1 is a schematic configuration diagram showing a first embodiment of a storage temperature management system according to the present invention. It is the sectional side view which showed another embodiment of the extraction part in the taking in / out apparatus. It is the schematic block diagram which showed 2nd Embodiment of the storage temperature management system which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 shows a first embodiment of a storage temperature management system 1 according to the present invention. The management system 1 includes a heat treatment tank 2 capable of storing a heating solution L, a loading / unloading device 3 for taking the article W into and out of the heating solution L in the heat treatment tank 2, and a heat treatment tank. The processing apparatus 5 having the boiling means 4 for boiling the heating solution L in 2 is used as a core, and a liquid temperature detection unit that detects the boiling temperature of the heating solution L in the heating treatment tank 2 is used in the processing apparatus 5. 6 and a replenishment control unit 7 for replenishing organic matter or water into the heat treatment tank 2 are added.

The heating solution L is a mixture (aqueous solution) in which a hydratable organic substance and water are mixed. In the first embodiment, it is assumed that the object to be heated W is a food before cooking (for example, a packaging bag in which raw rice, water, air, etc. are sealed), and accordingly, a heating solution The case where harmless glycerin is used for the organic matter contained in L will be described.
The loading / unloading device 3 is configured as a conveyor for conveyance, and the heated object W is placed in the heating solution L while continuously conveying or intermittently conveying the heated object W over the heat treatment tank 2 over a predetermined time. It is designed to keep it immersed. Moreover, it carries out both carrying in of the to-be-heated material W with respect to the heat processing tank 2, and carrying out to the tank exterior.

  In order to secure time for the article to be heated W to be immersed in the heating solution L, the length of the heat treatment tank 2, the transport speed of the loading / unloading device 3, the distance through which the loading / unloading device 3 passes through the heating solution L, etc. It is set appropriately. In addition, it is good to put the to-be-heated material W in the storage case (illustration omitted) which was able to accommodate the plurality of things collectively, and to convey this storage case by the taking in / out apparatus 3 with a predetermined pitch. In this case, it is preferable that the storage case has a structure in which the transporting pitch is held stationary while being able to be engaged and disengaged with respect to the loading / unloading device 3 as necessary.

The boiling means 4 employs an indirect heating method in which steam generated by a steam generator (not shown) such as a boiler is introduced into the heat treatment tank 2 and injected from the injection nozzle 10 into the heating solution L. ing.
In addition, those heat processing tank 2, the taking in / out apparatus 3, and the boiling means 4 are not specifically limited in those detailed structures. The point is that the object to be heated W is immersed in the heating solution L in the heat treatment tank 2 for a predetermined time, and the object to be heated W can be heated with the boiled heating solution L. Therefore, for example, the loading / unloading device 3 may be a belt conveyor using a net, a perforated belt, or the like, and the boiling means 4 may be a direct heating method such as direct flame burning or electric heating.

  The liquid temperature detector 6 is obtained by immersing the detector 12 using sensors as appropriate in the heating solution L of the heat treatment tank 2. Since the temperature to be detected is the boiling temperature of the heating solution L, the depth at which the detector 12 is immersed in the heating solution L is not particularly limited. Moreover, the arrangement | positioning in which the detector 12 is immersed in the heat processing tank 2 (heating solution L) is not specifically limited, The sensitivity and precision of the detector 12, the immersion position of the to-be-heated material W by the taking in / out apparatus 3, etc. May be set as appropriate. The detection data of this detector 12 is taken into the water supply control part 13 mentioned later.

The replenishment control part 7 is a place which replenishes organic substance or water in the heat processing tank 2 as needed based on the temperature detected by the liquid temperature detection part 6. In the first embodiment, as described above, the heating solution L stored in the heat treatment tank 2 is a mixture of glycerin and water.
Is provided with a water supply means 15.
That is, the heating solution L, which is a mixture of glycerin and water, decreases the mixing ratio of water that is relatively easily evaporated by continuing to boil. That is, since the proportion of glycerin is increased, the boiling temperature of the heating solution L is increased. Therefore, by replenishing the heat treatment tank 2 with the evaporated water, the mixing ratio of glycerin and water is restored to the original proper state, and the boiling temperature of the heating solution L can be lowered to the set temperature. It can be done.

  Table 1 shows the increasing tendency of the boiling temperature as the heating solution L when the weight part of glycerin is changed in the mixing ratio (weight ratio) of glycerin and water.

  This water supply means 15 can supply water (supplement water) into the heat treatment tank 2 when the temperature detected by the liquid temperature detection unit 6 deviates from or deviates from the set temperature set in the heat treatment tank 2. It is a place to make it. In the first embodiment, a pump 18 and an opening / closing valve 19 are provided in a water supply pipe 17 in which the water storage tank 16 and the heat treatment tank 2 are connected, and the pump 18 is driven simultaneously with opening the opening / closing valve 19. is there. In addition, an electric valve or an electromagnetic valve is employed as the on-off valve 19, and the water supply control unit 13 for automating the operation of the pump 18 and the on-off valve 19 is provided.

A heating device may be appropriately provided for the water storage tank 16 so that the water storage temperature is appropriately increased (for example, 40 ° C. to 80 ° C.). By doing in this way, when the to-be-heated object W is carried out from the heat processing tank 2, it becomes easy to peel off the heating solution L adhering to the to-be-heated object W, As a result, the heating carried out from the heat processing tank 2 There is an advantage that the solution L (particularly organic matter) can be suppressed as much as possible.
As a heat source in this case, steam generated by the steam generator of the boiling means 4 or exhaust heat recovered from the heat treatment tank 2 may be used. In addition, providing a heating device in the water storage tank 16 is not limited. In the case where no heating device is provided, the water storage tank 16 can be omitted by directly connecting the water supply pipe 17 to the water supply or the like. In this case, the pump 18 can be omitted.

The water supply control unit 13 is for automating the water supply means 15 as described above. That is, to restate, when the detected temperature detected by the liquid temperature detection unit 6 exceeds the set temperature set in the heat treatment tank 2, the on-off valve 19 is opened and the pump 18 is driven at the same time. Then, water supply is automatically started into the heat treatment tank 2. The water supply control unit 13 closes the open / close valve 19 and stops the pump 18 at the time when the temperature detected by the liquid temperature detection unit 6 reaches the set temperature or the semi-set temperature after the start of water supply. The water supply of the means 15 is automatically stopped.
Next, based on the operation status of the management system 1 according to the present invention having the above-described configuration, the liquid storage temperature management method according to the present invention will be described.

Suppose that the processing temperature for heating the article to be heated W in the heat treatment tank 2 (in the heating solution L) is set to 123 ° C. In the case where the heating solution L is a mixture of glycerin and water and the temperature when the heating solution L is boiled is set to 123 ° C., as is clear from Table 1, heating is performed. Solution L may be mixed at a ratio of 4 parts by weight of glycerin to 1 part by weight of water.
In a state where the heating solution L having such a mixing ratio is stored in the heat treatment tank 2, the heating solution L is heated by the boiling means 4 and boiled. When the heating solution L is boiled, the heating solution L receives a stirring effect in the heat treatment tank 2 and the temperature distribution becomes uniform.

When the water supply control unit 13 is in a state where it is confirmed that the boiling temperature of the heating solution L taken in by the liquid temperature detection unit 6 has reached a predetermined set temperature (123 ° C.), the loading / unloading device 3 The article to be heated W is carried into the treatment tank 2 (heating solution L) so as to be immersed and carried out.
When the article to be heated W passes through the heat treatment tank 2 (immersed in the heating solution L), the article to be heated W is heated for a predetermined time. As described above, if the object to be heated W is a food before cooking (for example, a package bag with raw rice, water, air, etc.), the object to be heated W is cooked by this heating (such as rice cooking). ) And will be sterilized.

While repeating the operation of the taking in / out device 3, the water supply control unit 13 manages the heating state so that the boiling state of the heating solution L is maintained, and the heating solution L taken in by the liquid temperature detection unit 6 is maintained. Monitor boiling temperature.
When the boiling temperature of the heating solution L deviates from the set temperature (for example, when the liquid temperature detection unit 6 detects 124 ° C.) or in anticipation of deviating (for example, exceeds 123 ° C. over time) When this is predicted, the water supply control unit 13 opens the on-off valve 19 of the water supply means 15 and simultaneously drives the pump 18 to automatically start water supply into the heat treatment tank 2.

Further, when the water supply control unit 13 closes the on-off valve 19 at the time when the temperature detected by the liquid temperature detection unit 6 reaches the set temperature after the start of water supply (when the temperature returns to 123 ° C. as the set temperature). At the same time, the pump 18 is stopped and the water supply of the water supply means 15 is automatically stopped. Thus, the boiling temperature of the heating solution L in the heat treatment tank 2 is maintained at the set temperature.
In addition, when a temperature drop is predicted even after water supply is stopped due to overshoot, water supply by the water supply means 15 is performed at a quasi-set temperature (for example, 123.5 ° C.) slightly before reaching the set temperature (immediately before the reached temperature). May be automatically stopped.

If it is the pipe | tube management method of the liquid storage temperature performed in this way, since the boiling temperature of the heating solution L can be adjusted to preset temperature by adjusting the replenishment amount of water, the temperature of the heating solution L is adjusted. The temperature can be made uniform and the temperature can be stabilized with high accuracy.
By the way, when the to-be-heated material W is a foodstuff, it is suitable to make it cool from processing temperature rapidly at the time of carrying out from the heat processing tank 2 with the taking in / out apparatus 3. FIG. It prevents the overcooking state and unifies the taste and hardness of the food in a good quality state, or facilitates the handling of the object to be heated W in the downstream process of the heat treatment tank 2, This is the main reason.

In order to satisfy such a requirement, for example, as shown in FIG. 2, in the loading / unloading apparatus 3, a path for taking out the object to be heated W from the heat treatment tank 2 is provided, and in this part, the object to be heated W is cooled. A shower device 25 for jetting water is provided. It is better to adopt a piping structure that collects the cooling water after use and can be reused by the pump 26.
[Second Embodiment]
FIG. 3 shows a second embodiment of the storage temperature management system 1 according to the present invention. The most different point of the management system 1 of the second embodiment from the first embodiment is that the water supply means 15 of the replenishment control unit 6 continuously supplies water to the inside of the heat treatment tank 2. There is in point.

The amount of water supplied by the water supply means 15 to the heat treatment tank 2 is within a range in which the amount of evaporation or volatilization of the heating solution L in the heat treatment tank 2 by boiling is replenished. Therefore, in principle, the liquid level in the heat treatment tank 2 is prevented from rising (the amount of liquid increases).
Then, according to the operation status of the water supply means 15, the water supply control unit 13 causes the heat treatment tank 2 to move into the heat treatment tank 2 when the detected temperature of the liquid temperature detection unit 5 deviates from the set temperature set in the heat treatment tank 2. The water supply amount to the water supply means 15 is automatically increased, and the water supply amount of the water supply means 15 is automatically reduced or stopped when the detected temperature of the liquid temperature detecting unit 5 reaches the set temperature or the semi-set temperature after the start of water supply. It has become. That is, the on-off valve 19 provided in the water supply means 15 is used as a flow rate adjusting valve.

Specifically, the on-off valve 19 is in principle kept in an open state while the pump 18 continues to operate. Then, when the boiling temperature of the heating solution L deviates from the set temperature (for example, when the liquid temperature detecting unit 6 detects 124 ° C. or the like) or anticipates deviating (for example, 123 ° C. over time) Is predicted, the water supply control unit 13 increases the opening of the on-off valve 19 and increases the amount of water supplied into the heat treatment tank 2.
In addition, after the start of water supply, when the temperature detected by the liquid temperature detection unit 6 reaches the set temperature (when the temperature returns to 123 ° C. as the set temperature), the opening degree of the on-off valve 19 is decreased, and in some cases, temporarily To reduce (squeeze) the amount of water supplied into the heat treatment tank 2. Thus, the boiling temperature of the heating solution L in the heat treatment tank 2 is maintained at the set temperature.

The water supply pipe 17 is connected to the object to be heated W from the heating solution L in the heat treatment tank 2 by the take-in / out device 3.
It is piped so as to perform water supply (shower-like discharge) to the heat treatment tank 2 at a position where it is taken out. Therefore, the effect of peeling off the heating solution L adhering to the article to be heated W is further enhanced, and at the same time, the effect of suppressing the heating solution L (especially organic matter) taken out from the heat treatment tank 2 is also enhanced. .
Even when water is supplied from the water supply pipe 17 (shower-like discharge) and there is a heating solution L that cannot be washed away from the heated object W, the heated object W taken out from the heat treatment tank 2 is stored in the water storage tank 16. It may be soaked in the water storage. In such a case, if the water storage temperature in the water storage tank 16 (that is, water discharged in a shower form from the water supply pipe 17) is kept at about 40 ° C., it is easy to handle the object to be heated W and it is convenient. .

In the second embodiment, in addition to the above, as the boiling means 4, the steam generated by a steam generator (not shown) such as a boiler is led to the heat exchanger 30 provided in the heat treatment tank 2, This is different from the first embodiment in that a circulation type system is used in which the heat exchanger 30 is recirculated to the generator side again.
[Others]
The present invention is not limited to the above-described embodiment, and can be appropriately changed according to the embodiment.

For example, in the heating solution L, the organic substance is not particularly limited. For example, when the article to be heated W is a food and is required to be a harmless substance, a carboxylic acid or the like can be used. . It is not limited to a liquid, and may be a solid such as sugar or salt (including powders, granules, jelly-like substances).
Moreover, it is not limited at all that the to-be-heated object W is a foodstuff, It is intended for almost all the things which require heat processing including industrial products, such as papers and textiles, such as cardboard. Can be implemented. In such a case, as the organic substance of the heating solution L, various liquids or solids including alcohols can be employed.

It goes without saying that depending on the detector 12 employed in the liquid temperature detection unit 6, the control accuracy of the liquid temperature can be increased or decreased arbitrarily.
The replenishment control unit 7 may be configured not to include the water supply control unit 13 but to manually operate the water supply unit 15 based on the detected temperature displayed by the liquid temperature detection unit 6.
As is clear from these examples, in the storage temperature management system and the storage temperature management method according to the present invention, the set temperature is not particularly limited, and is higher than 100 ° C. which is the boiling temperature of water. In some cases, the temperature may be lower than 100 ° C. Depending on these conditions, not only the case of supplying water, but also the case of supplying organic matter is included.

  The liquid storage temperature management system and the liquid storage temperature management method according to the present invention can be suitably used particularly for cooking and sterilization of food in sealed bags, and thus cooked and sterilized. The food is excellent in long-term storage. Therefore, it is extremely useful for the future of food (especially preserved foods and carry-on foods), and is also highly expected as a space food.

DESCRIPTION OF SYMBOLS 1 Management system 2 Heat processing tank 3 Taking in / out apparatus 4 Boiling means 6 Liquid temperature detection part 7 Supply control part 13 Water supply control part 15 Water supply means L Heating solution W To-be-heated material

Claims (7)

A heat treatment tank (2) for storing a heating solution (L) in which a hydratable organic substance and water are mixed;
A loading / unloading device (3) in which the object to be heated (W) is immersed in the heating solution (L) in the heat treatment tank (2) and taken out after a predetermined time;
Boiling means (4) for boiling the heating solution (L) in the heat treatment tank (2);
A liquid temperature detector (5) for detecting the boiling temperature of the heating solution (L) in the heat treatment tank (2);
It has a replenishment control part (6) which makes it possible to replenish organic matter or water into the heat treatment tank (2) as required based on the temperature detected by the liquid temperature detection part (5). Storage temperature management system.   The replenishment control section (6) is provided in the heat treatment tank (2) in anticipation of the temperature detected by the liquid temperature detection section (5) deviating from or deviating from the set temperature set in the heat treatment tank (2). The liquid storage temperature management system according to claim 1, further comprising water supply means (15) for enabling water supply to the water.   The water supply means (15) of the replenishment control section (6) heats when the temperature detected by the liquid temperature detection section (5) deviates from or deviates from the set temperature set in the heat treatment tank (2). Water supply is automatically started into the treatment tank (2), and the water supply means (15) is automatically supplied when the temperature detected by the liquid temperature detector (5) reaches the set temperature or the semi-set temperature after the start of water supply. The liquid storage temperature management system according to claim 2, further comprising a water supply control unit (13) for stopping the operation of the liquid storage temperature.   The water supply means (15) of the replenishment control unit (6) moves the heating solution (L) in the heat treatment tank (2) into the heat treatment tank (2) to the extent that it replenishes the amount evaporated or volatilized by boiling. Water is continuously supplied, and water is supplied into the heat treatment tank (2) when the temperature detected by the liquid temperature detector (5) deviates from or exceeds the set temperature set in the heat treatment tank (2). The water amount is automatically increased, and the water supply amount of the water supply means (15) is automatically reduced or stopped when the detected temperature of the liquid temperature detecting unit (5) reaches the set temperature or the semi-set temperature after the start of water supply. The liquid storage temperature management system according to claim 2, further comprising a water supply control unit (13).   The liquid storage temperature management system according to any one of claims 1 to 4, wherein the loading / unloading device (3) is a food conveying conveyor. A heating solution (L) in which a hydratable organic substance and water are mixed is stored in the heat treatment tank (2) and the heating solution (L) is heated.
While confirming that the boiling temperature of the heating solution (L) has reached a predetermined set temperature, repeatedly immersing the article to be heated (W) in the heating solution (L) and taking it out after a predetermined time,
Manage the heating state so that the boiling state of the heating solution (L) is maintained,
Monitoring the boiling temperature of the heating solution (L),
When the boiling temperature of the heating solution (L) deviates from or exceeds the set temperature, the boiling temperature of the heating solution (L) is set by replenishing organic matter or water into the heat treatment tank (2). A method for managing the temperature of stored liquid, characterized by maintaining the temperature.   In the heat treatment tank (2), the food to be heated (W) is a food before heating and the organic substance is glycerin, and the boiling temperature of the heating solution (L) deviates from or deviates from the set temperature. The method for managing a stored liquid temperature according to claim 6, wherein water is replenished.

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