JP2729421B2 - Decompression evaporative cooling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing the pressure in a cooling chamber, evaporating cooling water supplied, and evaporating and cooling an object to be cooled. As the reduced pressure evaporative cooling device,
There are various types of reactor cooling and food cooling devices.

[0002]

2. Description of the Related Art As a conventional reduced pressure evaporative cooling device, there is, for example, an evaporative cooling device for a reactor shown in FIG. In FIG.
Reference numeral 1 denotes a reaction vessel, which has a raw material inlet 2, a product outlet 3, a stirrer 4, and a jacket portion 5. A cooling water supply pipe 6 for supplying cooling water to the jacket portion 5 is connected, and a fluid discharge port 7 is provided at a lower portion of the jacket portion 5 to be connected to a vacuum pump 8.

When the reactor 1 is cooled, the inside of the jacket 5 is reduced to a predetermined pressure by a vacuum pump 8, and cooling water is supplied from a cooling water supply pipe 6, whereby the cooling water evaporates and evaporative cooling is performed. . A part of the cooling water that cannot be evaporated and the vaporized vapor are sucked and discharged from the fluid discharge port 7 by the vacuum pump 8.

[0004]

In the above-mentioned conventional decompression evaporative cooling device, the degree of decompression is unstable and therefore the degree of evaporation and vaporization is also unstable, resulting in uneven cooling, and the quality of the product as the object to be cooled is reduced. There was a problem that was difficult to keep constant. The reason for this is that the cooling water that cannot completely evaporate accumulates in the jacket portion and the fluid discharge port is blocked by the cooling water, so that the upper portion of the jacket is in a liquid-sealed state and the degree of pressure reduction is reduced. is there. It is sufficient to supply the cooling water to such an extent that the cooling water does not accumulate, but in order to do so, complicated controls and devices that constantly take into account fluctuations in the load and the amount of cooling water are required, which is not practical.

Further, the upper part of the jacket and the vacuum pump can be connected so that the degree of pressure reduction at the upper part of the jacket does not decrease even if the fluid discharge port is closed by the cooling water. However, even if the connection is made in this manner, the upper part of the jacket is required depending on whether the vacuum pump is for liquid or gas, or because the cooling water retained at the fluid discharge port is preferentially sucked into the vacuum pump by its head pressure. It is not always possible to effectively suck the vapor or residual air.

Accordingly, it is a technical object of the present invention to prevent a decrease in the degree of pressure reduction in the vaporizing cooling chamber by allowing both liquid and gas in the vaporizing cooling chamber to be sucked.

[0007]

The structure of the reduced pressure evaporative cooling device of the present invention is as follows. A drainage vacuum pump combining an ejector and a pump, and the drainage vacuum pump and the lower part of the vaporization cooling chamber are connected to supply cooling water to the vaporization cooling chamber,
In an apparatus for evaporating and cooling an object to be cooled, an evacuation vacuum pump is connected above the evaporative cooling chamber, and the evacuation vacuum pump is a water ring vacuum pump or a vacuum in which a plurality of stages of a steam ejector and a water ejector are combined. The pump or the last stage steam ejector is formed by a plurality of stages of steam ejectors connected to the drainage vacuum pump.

[0008]

By connecting a vacuum pump for drainage and a vacuum pump for evacuation to the evaporative cooling chamber, both liquid and gas existing in the evaporative cooling chamber can be sucked without stagnation. Therefore, it is possible to prevent the degree of reduced pressure from being reduced by preferentially sucking only the liquid.

[0009]

FIG. 1 shows a first embodiment. In this embodiment, an example in which a reactor is used as a cooling device will be described. In FIG. 1, a reaction vessel 21 and a drainage vacuum pump 22 are shown.
The evacuation vacuum pump 23 and the cooling water supply pipe 28 constitute a reduced pressure evaporative cooling device. The reactor 21 has a raw material inlet 2, a product outlet 3, a stirrer 4, and a jacket portion 5 as a vaporizing cooling chamber, as in the conventional reactor.
Are provided with cooling water supply ports 6a and 6b and a fluid discharge port 7.

The drainage vacuum pump 22 is composed of a combination pump in which an ejector 32 and a pump 30 are combined.
Is connected to the suction side of the tank 31 and the ejector 32 is connected to the discharge side.
And the diffuser 3 of the ejector 32
4 is connected to the upper space of the tank 31, the ejector 32 and the fluid outlet 7 at the lower end of the jacket portion 5.
Are connected by a communication passage 50, and a steam trap 51 and an automatic valve 52 are attached to the communication passage 50 in parallel. The automatic valve 52 may be an on-off valve that fully opens and closes completely, or may be one that can adjust the flow rate from fully closed to fully open. The drainage vacuum pump 22 supplies the water in the tank 31 to the ejector 32 by the operation of the pump 30 and causes the ejector 32 to perform a suction action, and returns the water to the tank 31.

The evacuation vacuum pump 23 communicates with the upper part of the jacket 5 through an evacuation pipe 57. As the evacuation vacuum pump 23, a water ring vacuum pump or the like can be used. An automatic valve 58 is attached to the exhaust pipe 57.

The cooling water supply pipe 28 is connected to the tank 31 via an automatic valve 70 and to the cooling water supply ports 6a and 6b via the automatic valve 26. Cooling water supply ports 6a, 6
It is desirable that b is provided over the entire circumference of the reaction vessel 21 in order to further prevent uneven cooling. Although not shown, a nozzle for spraying cooling water is desirably disposed at the cooling water supply ports 6a and 6b. A part of the cooling water is supplied to the tank 31 via the automatic valve 70. Tank 31
The temperature of the water in the tank 31 is controlled by supplying cooling water to the inside. The automatic valve 70 opens and closes based on a signal from a temperature sensor 41 that detects the temperature of the water in the tank 31.

The drainage vacuum pump 22 is provided with a surplus water discharging means 2.
5 is provided. The surplus water discharging means 25 is provided with an automatic valve 71 to maintain the water level in the tank 31 within a predetermined range based on signals from water level sensors 42a and 42b in the tank 31.

The automatic valve 75 is used when a part of the circulating water circulating through the drainage vacuum pump 22 is used as cooling water for the reactor 21. The drainage vacuum pump 22 and the jacket 5 are used. Of the cooling water supply port 6b. The automatic valve 76 opens and closes the heating steam supply pipe 27 when performing not only cooling but also heating. Each valve 26, 52, 58, 7
A temperature sensor 56 for detecting the temperatures of the objects 0, 71, 75, 76 and the object to be cooled in the reactor 21 is also connected to the control unit 29 so that centralized control is possible.

When cooling the reactor 21, the drainage vacuum pump 22 and the exhaust vacuum pump 23 are driven,
The automatic valves 52 and 58 are opened to maintain the inside of the jacket portion 5 at a predetermined vacuum state. Next, the automatic valve 26 is opened to supply the cooling water to the jacket portion 5. The supplied cooling water is immediately vaporized by the heat of the reaction vessel 21 to cool the reaction vessel 21. The vapor that has been vaporized by cooling and the cooling water that has not been completely vaporized are sucked by the exhaust vacuum pump 23 and the drain vacuum pump 22, respectively. Since both the steam and the cooling water are sucked, the degree of decompression of the jacket portion 5 becomes stable, and no cooling unevenness due to the decrease in the degree of decompression occurs.

The cooling water sucked by the drainage vacuum pump 22 reaches the tank 31 via the ejector 32. Tank 31
When the water level reaches a predetermined level, the automatic valve 71 is opened by the water level sensor 42a and is discharged out of the system as surplus water. The degree of vacuum of the drainage vacuum pump 22, that is, the degree of pressure reduction of the ejector 32, is adjusted by supplying cooling water to the temperature of the water in the tank 31 in order to reach a saturation pressure with respect to the temperature of the fluid passing through the nozzle 33. It can be controlled almost arbitrarily.

FIG. 3 shows a second embodiment, in which the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description of the reduced-pressure evaporative cooling device is omitted. In this embodiment, a steam ejector 60 is used as the evacuation vacuum pump 23, and the heating steam supply pipe 27 is connected via a valve 62, and steam is supplied from a nozzle 61 so that the jacket portion 5 is supplied.
This is for sucking gas such as vaporized vapor or some residual air inside. FIG. 3 shows a case where the steam ejector 60 is used in one stage, but a plurality of stages such as two stages or three stages may be used. By the steam ejector 60, the inside of the jacket portion 5 can be efficiently sucked into a relatively high vacuum.

FIG. 4 shows a third embodiment, in which the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the present embodiment, as the evacuation vacuum pump 23,
A plurality of steam ejectors 63 and 64 are used, and a water ejector 65 is connected to the last-stage steam ejector 64. The cooling water supply pipe 28 is branched and connected to a nozzle of a water ejector 65 via a valve 66.
The suction is performed at 64 and the vapor is suctioned at the water ejector 65. By using the water ejector 65 in the last stage, not only the driving steam but also the vaporized steam can be effectively sucked.

FIG. 5 shows another embodiment, in which a plurality of stages of steam ejectors 63 and 64 are used as an exhaust vacuum pump 23.
, And the last-stage steam ejector 64 is connected to the ejector 32 of the drainage vacuum pump 22 via the communication pipe 67. Vaporized steam is efficiently sucked by the steam ejectors 63 and 64, and cooling water is sucked by the drainage vacuum pump 22 together with the steam.

In this embodiment, a vacuum pump 22 for drainage and a vacuum pump 23 for exhaust are connected to separate pipes 5 respectively.
Although they were connected at 0 and 57, they can be connected by a common pipe line via a gas-liquid separator (not shown).

In this embodiment, the reactor is used as the evaporative cooling device. However, other distilling devices, concentrating devices, sterilizing devices and the like can be used in the same manner.

[0022]

According to the present invention, the liquid and the gas in the evaporative cooling chamber can be sucked without stagnation, and the degree of pressure reduction in the evaporative cooling chamber can be prevented from lowering. Therefore, it is possible to keep the product quality of the object to be cooled constant without causing cooling unevenness.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a reduced-pressure evaporative cooling device of the present invention.

FIG. 2 is a configuration diagram of a conventional evaporative cooling device.

FIG. 3 is a partial configuration diagram showing a second embodiment of the reduced-pressure evaporative cooling device of the present invention.

FIG. 4 is a partial configuration diagram showing a third embodiment of the reduced-pressure evaporative cooling device of the present invention.

FIG. 5 is a partial configuration diagram showing another embodiment of the reduced pressure evaporative cooling device of the present invention.

[Explanation of symbols]

 5 Jacket section 6a, 6b Cooling water supply port 21 Reactor 22 Vacuum pump for drainage 23 Vacuum pump for exhaustion 28 Cooling water supply pipe 30 Pump 31 Tank 32 Ejector

Claims (1)

(57) [Claims] A vacuum for drainage combining an ejector and a pump.
The pump, the drainage vacuum pump and the lower part of the evaporative cooling chamber are connected.
Subsequently , a cooling water is supplied to the evaporative cooling chamber to evaporate and cool the object to be cooled. An evacuation vacuum pump is connected above the evaporative cooling chamber , and the evacuation vacuum pump is connected with water.
Sealed vacuum pump or multistage steam ejector and water ejector
A vacuum pump or a final-stage steam ejector
Multi-stage steam ejector connected to the above-mentioned drainage vacuum pump
A reduced pressure evaporative cooling device characterized by being formed by: