JPH08159602A - Self-supercoolant production method of low temperature liquid and device thereof - Google Patents

Abstract

PURPOSE: To eliminate the need for a control valve which controls a flush liquid and a heat exchanger, and thereby reduce a manufacturing cost by generating cavitation in a low temperature saturated liquid which is retained in a supercoolant production vessel and vaporizing the liquid and self-supercooling the low temperature saturated liquid with this vaporized latent heat. CONSTITUTION: A low temperature saturated liquid is supplied into a production vessel from a low temperature saturated liquid supply line 10 and retained. When a vibrator 15 of a supersonic generator 14 is driven, a differential pressure inside and outside an air bubble core contained in a saturated liquid is changed by a local pressure fluctuation of compression waves which are transmitted in the liquid in a production vessel 11 so that cavitation may be produced in the liquid. A vaporization phenomenon is generated by extensive cavitation so that the heat of the low temperature saturated liquid may be robbed of with the vapored latent heat, thereby turning the saturated body into a supercoolant. In the case when it is necessary to control the supercooling temperature a controller 16 allows a temperature detection sensor 17 to detect the temperature of the supercoolant fed from a supercoolant line 12, thereby performing a feedback control that controls oscillation interval or oscillation strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a low temperature saturated liquid as a supercooled liquid by self-cooling.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional self-supercooled liquid generator, in which 1 is a saturated liquid supply line, 2 is a flash line, 3 is a supercooled liquid generation container, and 4 is a production container 3. A heat exchanger, 5 is a control valve, 6 is a pressure reducing valve, 7 is a supercooling liquid line, and 8 is a BOG line. In the case of the above conventional example, the low temperature saturated liquid is sent to the heat exchanger 4 from the supply line 1. Meanwhile, supply line 1 to flash line 2
A part of the low temperature saturated liquid branched via the
After depressurizing with, the gas is flushed into the gas phase in the production container 3. As a result, the interior of the production container 3 is cooled by the latent heat of vaporization, and the cold heat supercools the low temperature saturated liquid in the heat exchanger 4. The supercooled liquid is delivered from the supercooled liquid line 7.

[0003]

However, the above-mentioned conventional self-supercooling liquid generator has the following drawbacks. a. Since the heat exchanger 4 is provided in the production container 3, the structure is complicated and the manufacturing cost is high. b. The temperature of the supercooled liquid is controlled by the control valve 5 that controls the flushing flow rate, but this control valve 5 is expensive.

[0004]

The object of the present invention is to solve the problems described in the above a and b, and the constitution thereof is as follows. 1. A method in which cavitation is generated in a low temperature saturated liquid held in a supercooled liquid generation container to evaporate the low temperature saturated liquid in the container, and the low temperature saturated liquid is self-supercooled by the latent heat of vaporization. 2. A supercooled liquid generation container holding a low temperature saturated liquid supplied via a low temperature saturated liquid supply line, and an ultrasonic wave in the container for generating cavitation with respect to the liquid in the supercooled liquid generation container An ultrasonic generator having a vibrator attached thereto, a supercooling liquid line for sending out the supercooled liquid supercooled in the supercooling liquid generation container, and a temperature sensor attached to the supercooling liquid line are used for detection. A low-temperature liquid self-supercooled liquid generation device comprising: a controller that controls the ultrasonic generator so that the liquid temperature becomes a set temperature based on the supercooled liquid temperature.

[0005]

The low-temperature saturated liquid is supplied from the low-temperature saturated liquid supply line into the production container and temporarily stored therein. The ultrasonic generator drives the transducer so that the value becomes a set value. When this oscillator is driven, the internal and external differential pressures of bubble nuclei (mass of fine gas) in the low-temperature saturated liquid change due to local pressure fluctuations created by the compressional waves propagating in the liquid in the production container, It becomes unstable and cavitation occurs.
An evaporation phenomenon occurs due to the large amount of cavitation that occurs, and heat is taken from the saturated liquid by the latent heat of evaporation to become a supercooled liquid. The ultrasonic wave is oscillated intermittently according to the supply flow rate of the low temperature saturated liquid. Further, when the control of the supercooling temperature is required, the controller performs feedback control to detect the temperature of the supercooling liquid sent from the supercooling liquid line and control the oscillation interval or the oscillation intensity. As the piezoelectric material of the vibrator capable of oscillating at low temperature, for example, titanic acid, zirconic acid, lead or the like can be used.

[0006]

EXAMPLE FIG. 1 shows an example of the present invention. Reference numeral 10 is a low temperature saturated liquid supply line, 11 is a supercooled liquid generation container, 12 is a supercooled liquid line, 13 is a BOG line, 14 is an ultrasonic generator, and 15 is a vibrator. Although it is attached to the bottom of the container, the attachment position may be a side wall in the container 11, and its position is not limited as long as it is in the liquid. 16 is a controller, 17 is a supercooled liquid line 12
It is a supercooled liquid temperature detection sensor attached to the.

The low-temperature saturated liquid is supplied from the low-temperature saturated liquid supply line 10 into the production container 11 and temporarily held therein. The ultrasonic generator 14 drives the vibrator 15 so that the value becomes a set value. When this oscillator 15 is driven, the internal and external differential pressures of the bubble nuclei (mass of fine gas) in the saturated liquid change due to local pressure fluctuations produced by the compressional waves propagating in the liquid in the generation container 11, Cavitation occurs in an extremely unstable state. An evaporation phenomenon occurs due to the large amount of cavitation that occurs, and the latent heat of evaporation removes heat from the low-temperature saturated liquid to become a supercooled liquid. The ultrasonic wave is oscillated intermittently according to the supply flow rate of the low temperature saturated liquid. Further, when the control of the supercooling temperature is required, the controller 16 detects the temperature of the supercooling liquid sent from the supercooling liquid line 12 by the temperature detecting sensor 17 and controls the oscillation interval or the oscillation intensity. Do by control.

[0008]

As described above, the present invention uses the latent heat of vaporization of vapor generated by cavitation as means for supercooling and liquefying a low temperature saturated liquid by self-cooling. a. The flash line and heat exchanger for self-cooling are not required, the structure is simple, and the cost of manufacturing the device is low. b. Eliminates the need for expensive control valves to control the flush fluid. c. Since the temperature of the supercooling liquid can be controlled by the drive interval or strength of the oscillator that generates ultrasonic waves, the supercooling liquid temperature can be accurately controlled.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for producing a supercooled liquid and an apparatus therefor according to the present invention.

FIG. 2 is an explanatory diagram of a conventional supercooled liquid generation device.

[Explanation of symbols]

 10 Low Temperature Saturated Liquid Supply Line 11 Supercooled Liquid Generation Container 12 Supercooled Liquid Line 13 BOG Line 14 Ultrasonic Generator 15 Transducer 16 Controller 17 Supercooled Liquid Temperature Detection Sensor

Claims (2)

[Claims] 1. A method for evaporating a low temperature saturated liquid in the supercooled liquid generation container by causing cavitation in the low temperature saturated liquid, and self-supercooling the low temperature saturated liquid by the latent heat of vaporization. 2. A supercooled liquid generation container holding a low temperature saturated liquid supplied through a low temperature saturated liquid supply line, and a cavitation for the liquid in the supercooled liquid generation container. An ultrasonic generator having an ultrasonic transducer installed in a container, a supercooling liquid line for delivering the supercooled liquid supercooled in the supercooling liquid generation container, and a temperature attached to the supercooling liquid line A self-supercooled liquid generator for a low-temperature liquid, comprising: a controller that controls the ultrasonic generator so that the liquid temperature becomes a set temperature based on the supercooled liquid temperature detected by a sensor.