WO2021065600A1

WO2021065600A1 - Method for supplying heat medium to heat medium utilization device, and heat medium utilization equipment

Info

Publication number: WO2021065600A1
Application number: PCT/JP2020/035731
Authority: WO
Inventors: 石井　究
Original assignee: 月島機械株式会社
Priority date: 2019-09-30
Filing date: 2020-09-23
Publication date: 2021-04-08
Also published as: JP2021053597A; KR20220068981A; JP6869306B2

Abstract

[Problem] To minimize equipment costs and operating costs. [Solution] A method in which a heat medium is made to circulate between flow sections for the heat medium and a heat medium supply means in a heat medium utilization device 1, a first circulation system 20 is configured so that the heat medium flows into the flow sections 2, 3 and flows out from the flow sections 2, 3, and a second circulation system is configured so that the heat medium from the heat medium supply means is supplied to the entry side of the flow sections 2, 3 in the first circulation system 20 and returned to the heat medium supply means from the exit side of the flow sections 2, 3.

Description

Heat medium supply method and heat medium utilization equipment for heat medium utilization equipment

The present invention relates to a heat medium supply method to a heat medium utilization device and a heat medium utilization facility.

When a device using a heat medium, for example, a chemical device, or an indirect cooling type crystallizer is taken as a specific example, a refrigerant is also supplied to the jacket or element of the crystallizer, and the internal liquid is passed through the cooling surface. There is an embodiment in which the crystal is precipitated by cooling.

However, in this type of crystallization operation, it is necessary to cool the supply liquid as a refrigerant and remove the heat of crystallization, and since scaling is suppressed, the temperature difference from the cooling surface cannot be made very large. Or, it is necessary to supply a large amount of refrigerant to the element.

As a form example for this purpose, for example, there is a form shown in FIG. That is, the liquid refrigerant is supplied from the refrigerant hold tank 4 to the jacket 2 and the element 3 of the crystallization apparatus 1 through the supply path 6 by the refrigerant supply pump 5.
The returned refrigerant is returned to the refrigerant hold tank 4 through the return path 7, then supplied to the refrigerator 9 by the refrigerator supply pump 8, cooled by the refrigerator 9, and returned to the refrigerant hold tank 4 through the return path 9A. ..

JP-A-2010-131522

In the above-mentioned conventional embodiment, in order to supply a large amount of liquid refrigerant to the jacket 2 or element 3 of the crystallization apparatus 1, the refrigerant supply sources such as the refrigerator 9 and the refrigerant hold tank 4 are crystallized. It is difficult to install it in the vicinity of the device 1 from the viewpoint of equipment layout in the factory, and since the flow velocity to the cooling surface must be high in order to suppress scaling, a large capacity refrigerant is supplied. It is necessary to make the refrigerant circulation line large in diameter and lay it over a long distance (for example, 50 to 100 m).

This not only increases the equipment cost, but also increases the energy loss due to a large amount of cooling circulation power in the circulation process and heat input in the refrigerant circulation line, and as a result, the operating cost increases.

Therefore, a main object of the present invention is to provide a heat medium supply method and a heat medium utilization facility for a heat medium utilization device capable of suppressing equipment cost and operation cost.

In order to solve the above problems, the present invention relates to a method of circulating a heat medium between a heat medium distribution unit and a heat medium supply means in a heat medium utilization device, and is locally located in the vicinity of the distribution unit. The first circulatory system is formed, the second circulatory system of the heat medium that flows out from the heat medium supply means and then returns is formed, and the first circulatory system and the second circulatory system are connected to form the first circulatory system. This is an attempt to reduce the load on each of the circulatory system and the second circulatory system.

The first aspect of the present invention is a method of circulating a heat medium between a heat medium distribution unit and a heat medium supply means in a heat medium utilization device.
The heat medium constitutes a first circulatory system that flows into the distribution section and flows out of the distribution section.
A second circulation system is configured in which the heat medium from the heat medium supply means is supplied to the inlet side of the distribution section in the first circulation system and returned to the heat medium supply means from the exit side of the distribution section. To do,
This is a method of supplying a heat medium to a device using a heat medium.

A second aspect of the present invention is equipment in which a heat medium circulates between a heat medium distribution unit and a heat medium supply means in a heat medium utilization device.
A first circulatory system in which the heat medium flows into the distribution section and flows out of the distribution section.
With the second circulation system, the heat medium from the heat medium supply means is supplied to the inlet side of the distribution section in the first circulation system and returned to the heat medium supply means from the exit side of the distribution section. ,
It is a heat medium utilization equipment characterized by having.

According to the present invention, it is an object of the present invention to provide a method for supplying a heat medium to a device using a heat medium and the device thereof, which can suppress equipment costs and operating costs.

It is a flow sheet which shows the outline of the conventional form example. It is a flow sheet which shows the outline of the aspect of this invention. It is a flow sheet of a main part which shows the outline of another aspect. It is a flow sheet of a main part which shows the outline of another aspect.

The heat medium utilization device and the heat medium of the present invention have the meaning of including both the heating medium and the refrigerant (cooling medium).
Further, the equipment to be used is not limited as long as it uses a heat medium, and in the sense that it includes various chemical equipment including, for example, a reaction device, a crystallization device, an evaporation device, a drying device, and a heat device. is there. Further, the equipment to be used is not limited to a single equipment, and includes a mode in which the heat is used by a plurality of equipments.

In the following, an example of a refrigerant as a heat medium and a crystallization device (crystallizer) as a utilization device will be described with reference to the attached drawings. In the course of this description, other examples will be mentioned as appropriate.

For example, in the embodiment shown in FIG. 2, the refrigerant is supplied from the refrigerant hold tank 14 to the jacket 2 and the element 3 of the indirect cooling type crystallization device 1 through the supply path 16 by the refrigerant supply pump 15.
The refrigerant to be returned is returned to the refrigerant hold tank 14 through the return path 17, and then supplied to the refrigerator 19 by the refrigerator supply pump 18, and the one cooled by the refrigerator 19 is returned to the refrigerant hold tank 14 through the return path 19A. There is.

In this embodiment, the refrigerant is circulated to the crystallization apparatus 1 provided with the distribution unit. In this case, at least the refrigerant is supplied to the cooling jacket 2, and the element 3 may not be installed and may not be supplied to the element 3.

In this embodiment, a circulation pump 21 is provided for circulating the refrigerant. The refrigerant flows from the circulation pump 21 into the cooling jacket 2 and the element 3 as a flow unit via the outward path 22, flows out from the cooling jacket 2 and the element 3, and returns to the circulation pump 21 via the return path 23. Circulation system 20 is configured.

On the other hand, a refrigerant supply means including a refrigerant hold tank 14 and a refrigerator 19 is provided, and liquid refrigerant is supplied from the refrigerant hold tank 14 to the first circulation system 20 through the supply path 16 by the refrigerant supply pump 15. A second circulatory system 30 is configured in which the surplus of the first circulatory system 20 is returned to the refrigerant hold tank 14 through the return passage 17.

Further, in the illustrated embodiment, a vertical vent 24 for siphon break is provided in the first circulatory system 20 as necessary, and is pulled out from the upper part to the second circulatory system 30 by overflow.
According to this form, it is possible to stably extract the surplus without an incidental control mechanism.

It is necessary to remove the heat of cooling and crystallization by the refrigerant supplied to the distribution section, which can be achieved by circulating the refrigerant in the first circulation system 20 according to the above aspect.
Then, it is sufficient to supply the refrigerant from the second circulatory system 30 mainly only for the temperature fluctuation.
Since the components of the first circulation system 20 are mainly the circulation pump 21 and the circulation pipeline, the first circulation system 20 can be configured in the immediate vicinity surrounding the crystallization apparatus 1. The length of the first circulatory system 20 excluding the height of the distribution section is, for example, about 10 to 20 m, which is sufficient with respect to the length of the conventional example of 50 to 100 m.

For example, in the indirect cooling type crystallization apparatus 1, since the temperature difference from the cooling surface cannot be made very large in order to suppress scaling, in the conventional example, it is necessary to supply a large amount of refrigerant to the jacket 2 or the element 3. is there.
However, in the above embodiment, the circulation flow velocity in the first circulation system 20 may be maintained at the required speed, and the liquid refrigerant may be discharged from the second circulation system 30 in a small flow rate so as to compensate mainly for the temperature fluctuation. The path of the second circulatory system 30 may be small in diameter because it may be supplied by.
As a result, not only the flow path of the second circulation system 30, but also the circulation equipment (for example, a pump having a large capacity and a high lift), the refrigerator-related equipment, and the like can be miniaturized, and the equipment cost can be reduced. In addition, energy loss is reduced and operating costs are also reduced.

To further explain this point, it is necessary to distribute the refrigerant to the jacket 2 at a flow rate of, for example, about 0.5 to 4.0 m / sec. According to the aspect of the present invention, the required flow velocity is secured by the first circulatory system, and the second circulatory system mainly needs to compensate only for the temperature fluctuation in the first circulatory system. Good operation is possible with the circulation amount in the circulatory system being 1/5 to 1/20 of the circulation amount in the first circulation system.

A constant amount of the refrigerant may be supplied to the distribution section at a predetermined valve opening degree, or the supply amount may be controlled by controlling the flow rate or the like.
Preferably, a method is adopted in which the supply amount of the refrigerant is controlled by the temperature of the refrigerant locally circulating in the first circulation system 20 with respect to the jacket 2 or the element 3 of the crystallizer.
As a specific example of this, for example, as shown in FIG. 4, preferably, a temperature detector 25 (shown in the form of an indicator controller) is provided on the outlet side of the circulation pump 21, and the temperature by the temperature detector 25 is provided. Based on the signal, the flow rate adjusting valve (not shown) provided in the first circulation system 20, or more preferably, the inlet side of the circulation pump 21, and the supply amount of the refrigerant in the second circulation system 30. The temperature is controlled by the flow rate adjusting valve 31 to be adjusted.
In this way, in response to the temperature fluctuation required by the indirect cooling type crystallization apparatus 1, for example, the flow rate is adjusted in the first circulation system 20, or the supply is supplied from the second circulation system 30 to the first circulation system 20. Since the temperature can be compensated by adjusting the flow rate of the liquid refrigerant, highly accurate temperature control is possible.

The refrigerant supply point from the second circulation system 30 to the first circulation system 20 may be supplied to either the suction side or the discharge side of the circulation pump 21, but the mixing with the circulating refrigerant and the supply pressure may be applied. Considering this, the suction side is preferable. On the suction side, mixing can be performed well in the circulation pump 21.

With respect to the surplus amount of the refrigerant that locally circulates in the first circulation system 20 generated by the supply of the refrigerant, a fixed amount may be extracted at a predetermined valve opening degree, or the extraction amount may be controlled by flow rate control or the like. good.

Crystallized material may adhere to the cooling surface of the crystallization apparatus 1, reduce the heat transfer effect, and grow scaling.
For stable operation of the crystallization apparatus 1, the prior art (Japanese Patent Laid-Open No. 2010-131522) discloses a form in which a heated medium is supplied to a jacket to melt the crystallized product.
It should be noted that this prior art does not constitute the first circulatory system and the second circulatory system in the present invention.

At the time of the above melting, for example, melting can be achieved by the following forms.
That is, for example, at a stage where crystallized crystals adhere to the inner surface of the crystallization device 1 and continuous operation becomes difficult, the heat exchanger 40 is installed in the first circulation system 20 as shown in FIG. Then, in the melting and cleaning work of the crystallization apparatus 1, the temperature can be raised for the melting and cleaning work by heating only the refrigerant inside the first circulation system 20.
Further, it is also possible to use a part of the circulation line as a heating jacket pipe instead of or in combination with the heat exchanger 40.
As the heat exchanger, an appropriate type such as a shell and tube, a plate, and a double tube can be used.
Whether or not the crystal needs to be melted is determined by, for example, the operating time of the crystallization apparatus 1, an image or moving image inside the crystallization apparatus 1, the temperature of the refrigerant discharged from the jacket 2 of the crystallization apparatus 1, or the like. be able to.

In contrast to this, when a refrigerant system constituting a circulation line is constructed between the refrigerant supply means and the crystallization device 1 as in the conventional example, heating is performed with respect to the hold amount of the entire refrigerant system. Since the operation needs to be performed, the melting (melting) operation takes time and requires a lot of energy for heating.
On the other hand, for example, as shown in FIG. 3, a refrigerant heating means (for example, a heat exchanger 40) is incorporated in the first circulation system 20, and the refrigerant is heated by the heating means to heat the flow unit. In the form of melting the crystal through the medium, the melting (melting) operation does not require a long time, and a small amount of energy for heating is sufficient.

On the other hand, there is a crystallization operation that requires temperature control of the refrigerant. In this case, for example, the refrigerant whose temperature is adjusted in the second circulation system 30 can be supplied to the first circulation system 20.

Further, when a refrigerant system constituting a circulation line is constructed between the refrigerant supply means and the crystallization apparatus 1 as in the above-mentioned conventional example, the refrigerant is cooled particularly in a system using a low temperature refrigerant. Since it is necessary to change the temperature of the entire refrigerant system including the refrigerator for cooling, there is a problem that the followability of the temperature control is deteriorated.

On the other hand, according to the above-described aspect of the present invention, the temperature is adjusted by adjusting the flow rate in the first circulation system 20 or adjusting the flow rate of the liquid refrigerant supplied from the second circulation system 30 to the first circulation system 20. Since it can be compensated, highly accurate temperature control is possible, and the flow rate of the liquid refrigerant supplied mainly to the first circulation system 20 is adjusted without changing the temperature of the entire refrigerant system including the refrigerator, or the refrigerant. The temperature can be adjusted while suppressing the temperature change of the entire system.

In the above example, a vertical vent 24 for siphon break is provided. In the conventional form, a large amount of refrigerant contained in the jacket 2 of the crystallization apparatus 1 returns to the refrigerator 19 side as it is on the return line, and no vent is used. The control of the return amount in the conventional form is performed by controlling the rotation speed of the pump that supplies the refrigerant to the crystallization apparatus 1. A large amount of refrigerant contained in the jacket 2 of the crystallization apparatus 1 returns to the refrigerator 19 side as it is on the return line.
In the refrigerant circulation system according to the present invention, since the amount of return from the first circulation system 20 to the refrigerator 19 side is small, a vent 24 is installed and the surplus in the first circulation system 20 is overflowed to the refrigerator. It can be returned to the 19th side.
Being able to return the surplus in the first circulation system 20 to the refrigerator 19 side by overflow reduces the burden on the pump that supplies the refrigerant to the crystallization device 1 and its rotation speed control equipment, and reduces the equipment and operating costs. There is an advantage to do.
In the above embodiment, it is preferable to provide the opening of the vent 24 at a position higher than the liquid height corresponding to the pressure loss for the amount of return to be returned to the refrigerator 19.

In the above example, the refrigerant hold tank 14 is provided. A weir plate 14a is provided in the refrigerant hold tank 14.
The return amount of the refrigerant returned from the first circulation system 20 is sent to one side of the weir plate 14a, and the refrigerant cooled by the refrigerator 19 is sent to the other side of the weir plate 14a of the refrigerant hold tank 14 through the return path 19A. Returned. In this case, it is desirable that the distribution of the supply to the refrigerant hold tank 14 is performed as follows.
That is, the amount of supply from the refrigerator 19 side to the refrigerant hold tank 14 through the return path 19A is increased, the inside of the refrigerant hold tank 14 is partitioned by the weir plate 14a, and as shown in FIG. 2, from the other side of the weir plate 14a. Overflow to the supply side to the refrigerator 19 by the refrigerator supply pump 18 (that is, to one side of the weir plate 14a where the return portion of the refrigerant is returned from the first crystallization circulation system 20 through the return path 17). The form to make it is desirable.
In this overflow mode, as described above, as the refrigerant circulation amount in the second circulation system decreases, the circulation amount of the overflowing refrigerant also decreases, so that the advantage of the overflow form in the refrigerant hold tank 14 is It has the advantage of becoming apparent and reducing equipment and operating costs.

In the present invention, as described above, the heat medium utilization device and the heat medium have the meaning of including both the heating medium and the refrigerant (cooling medium), and are not limited to the above-mentioned crystallization device and the refrigerant. ..

1 ... Indirect cooling crystallizer, 2 ... Jacket, 3 ... Element, 14 ... Refrigerant hold tank, 15 ... Refrigerant supply pump, 16 ... Supply path, 17 ... Return path, 19 ... Refrigerator, 20 ... First circulation System, 21 ... Circulation pump, 22 ...

Outward route

22, 23 ... Return route, 24 ... Vent, 25 ... Temperature detector, 30 ... Second circulation system, 31 ... Flow control valve, 40 ... Heat exchanger.

Claims

A method of circulating a heat medium between a heat medium distribution unit and a heat medium supply means in a heat medium utilization device.
The heat medium constitutes a first circulatory system that flows into the distribution section and flows out of the distribution section.
A second circulation system is configured in which the heat medium from the heat medium supply means is supplied to the inlet side of the distribution section in the first circulation system and returned to the heat medium supply means from the exit side of the distribution section. To do,
A method for supplying a heat medium to a device using a heat medium.
The method for supplying a heat medium to a heat medium-using device according to claim 1, wherein the temperature of the heat medium is adjusted in the second circulatory system, and then the temperature-controlled heat medium is supplied to the first circulatory system.
A method of supplying a refrigerant to a crystallization apparatus having a distribution unit having at least a cooling jacket for circulating the refrigerant.
The refrigerant flows into the distribution section and constitutes a first circulation system that flows out from the distribution section.
It constitutes a second circulation system in which the refrigerant from the refrigerant supply means is supplied to the inlet side of the distribution section in the first circulation system and returned to the refrigerant supply means from the exit side of the distribution section.
A method for supplying a refrigerant to a crystallization device.
The method for supplying a refrigerant to the crystallization apparatus according to claim 3, wherein the temperature-controlled refrigerant is supplied to the first circulation system after adjusting the refrigerant temperature in the second circulation system.
The method for supplying a refrigerant to the crystallization apparatus according to claim 3, wherein a refrigerant heating means is incorporated in the first circulation system, the refrigerant is heated by the heating means, and the crystals are melted through the distribution unit. ..
A facility in which a heat medium circulates between a heat medium distribution unit and a heat medium supply means in a heat medium utilization device.
A first circulatory system in which the heat medium flows into the distribution section and flows out of the distribution section.
With the second circulation system, the heat medium from the heat medium supply means is supplied to the inlet side of the distribution section in the first circulation system and returned to the heat medium supply means from the exit side of the distribution section. ,
Heat medium utilization equipment characterized by having.
The heat medium utilization equipment according to claim 6, wherein a heat medium whose temperature is controlled in the second circulation system is supplied to the first circulation system.
A crystallization facility equipped with a distribution unit having at least a cooling jacket for distributing a refrigerant.
A first circulatory system in which the refrigerant flows into the distribution section and flows out from the distribution section.
A second circulation system in which the refrigerant from the refrigerant supply means is supplied to the inlet side of the distribution section in the first circulation system and returned to the refrigerant supply means from the exit side of the distribution section.
A crystallization facility characterized by having.
The crystallization facility according to claim 8, wherein the refrigerant whose temperature is controlled in the second circulation system is supplied to the first circulation system.
A refrigerant heating means is incorporated in the first circulation system.
The crystallization facility according to claim 8, wherein the refrigerant is heated by the heating means, and the crystals can be melted through the distribution section.
A temperature detecting means is provided in the first circulatory system.
8. Claim 8 in which a flow rate adjusting means is provided in a refrigerant supply path to the first circulation system in the second circulation system, and the refrigerant flow rate is adjusted by the flow rate adjusting means based on the refrigerant temperature by the temperature detecting means. The crystallization equipment described.
A temperature detecting means is provided between the outlet side of the circulation pump in the first circulation system and the inlet of the distribution section.
In the second circulation system, a flow rate adjusting means is provided in the refrigerant supply path to the inlet side of the circulation pump of the first circulation system.
The crystallization facility according to claim 8, wherein the refrigerant flow rate is adjusted by the flow rate adjusting means based on the refrigerant temperature by the temperature detecting means.
The crystallization facility according to claim 8, wherein a vertical vent is provided in the first circulation system, and an opening of the vent is connected to the second circulation system.