JP2684291B2 - 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 a system in which a cooling chamber is depressurized and the supplied cooling water is evaporated to vaporize and cool an object to be cooled. More specifically, the present invention relates to a cooling device for a reaction vessel for performing various reactions, and a vaporizing cooling device for food, medicine, paper, pulp, fiber, and the like.

[0002]

2. Description of the Related Art As a conventional cooling device for a reactor, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 1-315336.
This is an ejector consisting of a nozzle and a suction chamber, a combination pump that combines the ejector, a tank, and a pump, a switching valve means that can supply a part of the discharge water of the combination pump to the fluid chamber of the reaction vessel, and a passage inside the ejector. And a temperature controller for controlling the temperature of the fluid to be supplied, and the discharge water from the combination pump for cooling is supplied to the fluid chamber of the reaction vessel to evaporate and cool the reaction vessel. The suction force, that is, the degree of reduced pressure generated in the nozzle of the ejector, becomes a saturation pressure with respect to the temperature of the fluid passing through the nozzle, so the degree of reduced pressure in the nozzle is increased, and by extension, the degree of reduced pressure in the cooling chamber is increased to further promote vaporization cooling This can be done by lowering the temperature of the fluid passing through the nozzle by the temperature control unit.

[0003]

In the above-mentioned conventional apparatus, the degree of pressure reduction can be changed by adjusting the temperature of the fluid passing through the nozzle, but a time delay occurs when the degree of evaporative cooling is changed. There was a problem. For example, in a reaction kettle, it is necessary to accurately adjust the temperature in the course of the reaction, and if a time delay occurs, the reaction product may deteriorate,
There is a risk of damage. The cause of this time delay is that the fluid pressure passing through the nozzle cannot be changed quickly. By increasing or decreasing the fluid pressure passing through the nozzle, it is possible to increase or decrease the suction capacity of the nozzle, that is, the suction amount of the fluid per unit time. The fluid pressure passing through the nozzle was changed by controlling the pump rotation speed and adjusting the pump discharge pressure.However, the pressure of the fluid actually passing through the nozzle was changed by controlling the pump rotation speed. It takes time to be done, and there is a delay.

Therefore, a technical problem of the present invention is that the degree of evaporative cooling can be controlled without causing a time delay, that is, the suction capacity of the nozzle can be controlled, and the cooling temperature can be adjusted with high accuracy. To get the equipment.

[0005]

The structure of the reduced pressure evaporative cooling device of the present invention is as follows. An ejector including a nozzle and a suction chamber, a combination pump that combines the ejector, a tank, and a pump, an evaporative cooling chamber that communicates with the suction chamber, and a cooling water supply passage that supplies cooling water to the evaporative cooling chamber and the tank. In the evaporative cooling device consisting of, the nozzle is formed of a plurality of fine holes, and fine hole opening / closing means for opening / closing a part of the fine holes is provided.

[0006]

By supplying the fluid in the tank to the nozzle of the ejector by the pump, the ejector section has a saturation pressure corresponding to the fluid temperature, and by setting the fluid temperature to 100 ° C. or less, the pressure is reduced to the atmospheric pressure or less. be able to. When the pressure is reduced by the ejector, the vaporization cooling chamber communicating with the suction chamber is also depressurized, and the supplied cooling water is vaporized to vaporize and cool the object to be cooled. The vapor that takes away the heat and vaporizes is drawn into the suction chamber of the ejector and reaches the tank.

When the degree of evaporative cooling is adjusted by changing the suction capacity of the nozzle, the amount of fluid passing through the nozzle is changed by opening and closing a part of the plurality of pores by the pore opening and closing means. The pressure also changes, and the suction capacity of the nozzle can be changed quickly.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In this embodiment, a reaction kettle is used as an evaporative cooling device,
An example using two combination pumps is shown. A reduced pressure evaporative cooling device is constituted by a reaction vessel 21 having a jacket portion 20 as an evaporative cooling chamber, combination pumps 22 and 23, and a cooling water supply passage 24. The reaction kettle 21 forms a jacket portion 20 over substantially the entire circumference, and is equipped with a raw material inlet 25, a product outlet 26, a stirrer 27, and a temperature sensor 28 for detecting the temperature of an object to be cooled, and the jacket portion 20 is cooled. A water supply port 29 and a fluid discharge port 30 are provided.

The combination pumps 22 and 23 are both pumps 3.
1, 32 are connected to the tanks 33 and 34 on the suction side and are connected to the discharge sides on the ejectors 35 and 36, and the diffusers 37 and 38 of the ejectors 35 and 36 are connected to the upper space of the tanks 33 and 34. The ejector 35 and the fluid discharge port 30 of the reaction vessel 21 are connected via a valve 50 and a trap 51, and the ejector 36 and the upper portion of the jacket 20 are connected via a valve 52. The combination pumps 22 and 23 are configured to supply the water in the tanks 33 and 34 to the ejectors 35 and 36 by the operation of the pumps 31 and 32 to cause the ejectors 35 and 36 to suck the water, and to return the water to the tanks 33 and 34.

The nozzle 39 of the ejector 35 is formed by a single hole, while the upper ejector 36 forms the nozzle 2 by a plurality of pores 3 as shown in detail in FIGS. That is, the ejector 36 includes the driving fluid inlet 1 connected to the discharge side of the pump 32 and the cylindrical member 5 having a plurality of pores 3 at the bottom.
The nozzle 2 formed in 1., the suction chamber 6 provided around the nozzle 2, and the ejector suction port 7 and the diffuser 38 connected to the suction chamber 6. A plate-like valve 9 serving as a fine hole opening / closing means is arranged on the upper surface of the fine hole 3 forming the nozzle 2, and is connected to the handle 11 via a connecting shaft 10. As shown in FIG. 3, the plate valve 9 is formed in a cross shape having a width capable of covering the pore 3. When the plate-shaped valve 9 is arranged at the position shown by the solid line in FIG. 3, the eight pores 3 (the broken-line pores 3) are fully closed, and from this state, the plate-shaped valve 9 is rotated 30 degrees clockwise by the connecting shaft 10. When is rotated (the position indicated by the alternate long and short dash line), the four pores are fully closed, and when further rotated in the clockwise direction (the position indicated by the broken line), there are no closed pores 3 and all the pores 3 are fully opened. .

The cooling water supply passage 24 has a jacket portion 20.
Is provided to control the water temperature in the tank 33 or 34 while supplying the cooling water from the cooling water supply port 29 to the tank 33 or 34 and supplying the cooling water to the tank 33 or 34 via the valves 53 and 54. It is controlled by the thing. Excess water in the tanks 33 and 34 is pumps 31 and 32.
It is discharged to the outside of the system by valves 55 and 56 provided on the discharge side.

A part of the circulating water of the combination pump 22 is valve 57.
The cooling water supply port 29 of the jacket portion 20 may be connected to the cooling water supply port 29 via a separate valve 58, and a steam supply pipe 59 for heating instead of cooling may be connected to the cooling water supply port 29.

When cooling the object to be cooled in the reaction vessel 21,
That is, when evaporative cooling is performed in the jacket portion 5, cooling water is supplied from the cooling water supply passage 24 into the tanks 33 and 34 through the valves 53 and 54, and also to the jacket portion 20 through the cooling water supply port 29. Supply cooling water. In this case valve 5
7, 58 are closed and valves 50, 52 are open. Pump 3
The fluid in the tanks 33 and 34 is driven by the motors 1 and 32 and reaches the ejectors 35 and 36 to generate a suction force. Due to the suction force of the ejectors 35 and 36, the inside of the jacket portion 20 is also depressurized, and the supplied cooling water is evaporated by the heat of the object to be cooled, and the object to be cooled is vaporized and cooled. The vaporized vapor and the non-vaporized cooling water pass through the valves 52 and 50, and the ejector 3
6 and 35 are sucked to reach the tanks 34 and 33. In this case, the vaporized steam is mainly sucked by the ejector 36, and the cooling water is mainly sucked by the ejector 35.

For example, when the degree of pressure reduction in the jacket portion 20 is instantly increased to enhance the degree of cooling, cooling water is replenished in the tanks 33 and 34, and the handle 3 is operated through the pores 3 of the upper ejector 36. As a result, the pressure of the fluid passing through the nozzle 2 rises and the suction capability of the ejector 36 increases, so that the vaporized vapor in the jacket 20 is quickly sucked and the degree of pressure reduction increases without time delay.

In the present embodiment, the combination pump 22,
Although an example in which two 23 are used is shown, of course, one may be used, or the same effect can be obtained by using two or more.

Further, in this embodiment, since the steam supply pipe 59 for heating is provided through the valve 58, not only the reduced pressure evaporative cooling but also the reduced pressure steam heating or the positive pressure steam heating can be performed. In this case, the condensate generated by heating is sucked into the ejector 35 via the trap 51 or the valve 50, and the steam that has not been completely condensed is sucked into the ejector 36 above.

[0017]

The present invention has the following effects. Since the pore opening / closing means can open / close a part of the pores forming the nozzle to adjust the fluid pressure passing through the nozzle, there is no time delay as in the conventional discharge pressure control of the pump. . Therefore, the suction capacity of the nozzle can be quickly adjusted without a time delay, and the cooling temperature of the evaporative cooling can be adjusted accurately.

[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 sectional view of an ejector used in the reduced pressure evaporative cooling apparatus of the present invention.

FIG. 3 is a partially enlarged view taken along the line AA in FIG.

[Explanation of symbols]

 2 Nozzle 3 Pore 9 Plate-shaped valve 20 Jacket 21 Reaction kettle 22,23 Combination pump 31,32 Pump 33,34 Tank 35,36 Ejector

Claims (1)

(57) [Claims] 1. An ejector comprising a nozzle and a suction chamber, and a combination pump comprising a combination of the ejector, a tank and a pump.
In the evaporative cooling device consisting of the evaporative cooling chamber communicating with the suction chamber, the evaporative cooling chamber and the cooling water supply passage for supplying the cooling water to the tank, the nozzle is formed with a plurality of pores,
A reduced pressure evaporative cooling apparatus comprising a fine hole opening / closing means for opening / closing a part of the fine holes.