JP2684272B2 - 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 for evaporating and cooling an object to be cooled by putting a cooling section in a depressurized state. In particular,
The present invention relates to a cooling device for a reaction kettle that performs various reactions, a vaporization cooling device for foods, synthetic fibers, films 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 a combination pump that combines an ejector, a tank, and a pump, a switching valve that can supply a part of the discharge water of the combination pump to the fluid chamber of the reactor, and a temperature control that controls the temperature of the fluid passing through the ejector And discharge water from a combination pump for cooling to the fluid chamber of the reaction vessel to vaporize and cool the reaction vessel. The suction force generated by the ejector, that is, the degree of decompression, becomes a saturation pressure with respect to the temperature of the fluid passing through the ejector. This can be achieved by lowering the temperature of the fluid passing through the ejector by the temperature control unit.

[0003]

With the above-mentioned conventional apparatus, it is impossible to prevent a rapid rise in the temperature of the reaction vessel.
There was a problem that partially caused thermal runaway. This is because the discharge water of the combination pump is used as the cooling means and the discharge water is cooled only by the latent heat of vaporization. High temperature accuracy is required in various reaction processes and cooling of foods, fibers, etc. In particular, thermal runaway must be reliably prevented because it causes thermal damage to the object to be cooled and compositional change.

Therefore, a technical object of the present invention is to obtain a decompression evaporative cooling device which can surely prevent thermal runaway.

[0005]

The structure of the reduced pressure evaporative cooling device of the present invention is as follows. A vortex tube that swirls compressed air in a vortex shape to generate low-temperature air by adiabatic expansion, and a low-temperature air generation section of the vortex tube and a nozzle of an ejector are connected to each other, and a suction chamber and a water supply section formed around the nozzle are connected to each other. The outlet of the ejector and the cooling unit are connected, and the cooling unit and the vacuum pump are connected.

[0006]

[Function] As is well known, the vortex tube is called a vortex tube, and the compressed air in the center of the vortex is adiabatically expanded by swirling the compressed air into a low temperature air. Is. By connecting the low temperature air generating part of the vortex tube and the nozzle of the ejector, the low temperature air flows down through the nozzle at a high speed to generate suction force, and the water of the water supply part is sucked from the suction chamber around. The aspirated water mixes with the cold air in the suction chamber to form fine, soft ice. The soft ice reaches the cooling part from the outlet of the ejector together with the low temperature air, and cools the object to be cooled by the heat of melting of the ice and the heat conduction to the low temperature air. The cooling unit is connected to a vacuum pump and is in a predetermined vacuum state. The ice water melted by cooling further removes heat from the object to be cooled and is vaporized, thereby evaporating and cooling the object to be cooled. The vaporized vapor and low temperature air are sucked by the vacuum pump and discharged to the outside of the system.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In this embodiment, an example in which a reaction vessel is used as a vaporization cooling device will be described. Reaction kettle 2 equipped with jacket 1 as cooling unit
The vortex tube 3, the ejector 4, the water supply unit 5, and the combination pump 6 as a vacuum pump constitute a reduced pressure evaporative cooling device. The reaction kettle 2 forms a jacket portion 1 over substantially the entire circumference and is provided with a raw material inlet 7, a product outlet 8 and a stirrer 9. The jacket portion 1 is provided with a cooling fluid supply port 10 and fluid discharge ports 11 and 12. There is.

As shown in FIGS. 2 and 3, the vortex tube 3 is provided with a low temperature air extraction member 17 at one end through a partition member 16 and a high temperature air extraction member 18 by adiabatic compression at the other end. . The low temperature air extraction member 17 has an introduction port 19 connected to the compressed air supply pipe 13, and the introduction port 19 is an annular space 20 formed between the inner peripheral wall of the low temperature air extraction member 17 and the outer peripheral wall of the partition member 16. To open. The partition member 16 has a low temperature air outlet 21 at the center and is connected to the low temperature air supply pipe 14. The partition member 16 has a plurality of grooves 2 on its end face.
3, the groove 23 forms an injection passage opening from the annular space 20 tangentially to the inner wall of the vortex tube 3. The hot air outlet member 18 is provided with a passage 25 to connect the hot air exhaust pipe 15.

The low temperature air supply pipe 14 and the nozzle 26 of the ejector 4 are connected. A suction chamber 27 is formed on the outer circumference of the nozzle 26 and connected to the water supply unit 5. Diffuser 2 of ejector 4
8 and the cooling fluid supply port 10 of the jacket part 1 are connected.

In the combination pump 6 as a vacuum pump, the pump 30 is connected to the tank 31 on the suction side and the discharge side is connected to the nozzle 33 of the ejector 32 for the combination pump, and the diffuser 34 of the ejector 32 is connected to the tank 31. It is configured to be connected to the upper space, and includes the ejector 32 and the reaction kettle 2.
Fluid outlets 11 and 12 are connected. The combination pump 6 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.
To return to. The tank 31 has a cooling water supply pipe 3 for adjusting the water temperature of the circulating liquid circulating in the pump 30.
5 is connected, and a discharge pipe 36 for discharging a part of the circulating liquid to the outside of the system and a circulating liquid supply pipe 37 for supplying the circulating liquid to the suction chamber 27 are connected. A communication pipe 40 for communicating with the atmosphere is provided above the tank 31.

When the reaction kettle 2 is cooled, compressed air is supplied from the compressed air supply pipe 13 to the vortex pipe 3. The low temperature air generated by adiabatic expansion in the vortex tube 3 is supplied to the nozzle 26 of the ejector 4 via the low temperature air supply tube 14. When the low-temperature air flows down the nozzle 26, suction force is generated and the water supply unit 5
The water is sucked from and mixed with the low temperature air in the suction chamber 27.
When cold air and water mix, the water becomes tiny, soft ice. Diffuser 28 for soft ice and cold air
Is supplied to the jacket portion 1 through the cooling fluid supply port 10 to cool the reaction kettle 2. In this case, soft ice adheres to the outer periphery of the reaction kettle 2, and the reaction kettle 2 is first cooled by the heat of melting caused by the melting of the ice, and then the ejector 32 of the combination pump 6 serving as a vacuum pump inside the jacket 1 Is maintained in a predetermined vacuum state, the reaction vessel 2 can be cooled by the latent heat of vaporization caused by the vaporization of water.

The vaporized steam, compressed air, and water that have not been vaporized by cooling the reaction kettle 2 are sucked by the ejector 32, reach the tank 31, and are sucked by the pump 30 to be circulated. A part of the circulating liquid can be supplied to the suction chamber 27 via the circulating liquid supply pipe 37. This is to cool the reaction vessel 2 and supply a part of the circulating liquid having a relatively high temperature to the suction chamber 27, thereby producing a cooling fluid having a relatively high temperature as compared with the water absorption from the water supply section 5. It is possible.

[0013]

The present invention has the following effects. Cooling can be performed by adding not only the latent heat of evaporation of cooling water but also the heat of melting of ice, and rapid cooling can reliably prevent thermal runaway. Further, since the water becomes soft ice due to the low temperature air, the soft ice adheres to the surface of the object to be cooled, and the entire surface of the object to be cooled can be cooled uniformly.

[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 an enlarged sectional view of the vortex tube in FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

[Explanation of symbols]

 1 Jacket Part 2 Reactor Kettle 3 Vortex Tube 4 Ejector 5 Water Supply Section 6 Combination Pump 10 Cooling Fluid Supply Port 11 Fluid Discharge Port 13 Compressed Air Supply Pipe 14 Low Temperature Air Supply Pipe

Claims (1)

(57) [Claims] 1. A suction pipe formed around a nozzle, wherein a vortex tube for swirling compressed air to generate low temperature air by adiabatic expansion, a low temperature air generating portion of the vortex tube and a nozzle of an ejector are communicated with each other. A reduced pressure evaporative cooling device in which a chamber is connected to a water supply unit, an outlet of the ejector is connected to a cooling unit, and the cooling unit is connected to a vacuum pump.