JP4164203B2 - Gas liquefaction recovery equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recovery and liquefaction apparatus for liquefied gas used in a technical field that uses liquefied gas in order to obtain a low-temperature working environment. The present invention relates to a recovery and liquefaction apparatus for liquefied gas released after being used for cooling.
[0002]
[Prior art]
Cooling of liquefied gas such as liquefied nitrogen, liquefied argon, liquefied helium or liquefied hydrogen is required to create a cryogenic working environment for cooling of electronic measuring instruments such as electron microscope and NMR, and scientific equipment such as superconducting experimental equipment. Uses heat.
[0003]
[Problems to be solved by the invention]
However, in this case, when the liquefied gas is replenished or filled into the container, the vaporized component of the liquefied gas or the gas vaporized at the time of transfer and filling is released from the container. In addition, scientific and scientific instruments such as electronic measuring instruments and superconducting experimental facilities use heat of vaporization to maintain a low temperature, so that vaporized gas is released to keep the pressure inside the container constant. Yes. For this reason, expensive liquefied gas was wasted, and there was a problem that the effective utilization rate of liquefied gas was lowered.
[0004]
The present invention pays attention to such a point, and an object of the present invention is to provide a gas liquefaction recovery apparatus capable of recovering and liquefying the vaporized gas released at the time of transferring and filling the liquefied gas or after cooling the scientific instrument.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention described in claim 1 divides the inside of the heat insulating container into two upper and lower chambers by a heat exchange plate, and positions the cold end of the cryogenic refrigerator in the upper chamber. The refrigerant gas is stored in a liquid state, and the gas to be recovered is introduced into the lower chamber, and the gas to be recovered is liquefied and recovered by the retained heat of the liquefied refrigerant gas stored in the upper chamber. The invention according to claim 2 is characterized in that an impurity removing filter is mounted in the lower chamber.
[0006]
[Effects of the Invention]
In the present invention, the inside of the heat insulating container is partitioned into two upper and lower chambers by a heat exchange plate, and the cold chamber of the cryogenic refrigerator is disposed facing the upper chamber, and the refrigerant gas is collected in the lower chamber, and the refrigerant gas is collected in the lower chamber. Since each gas is introduced, the refrigerant gas is directly cooled and liquefied by the cryogenic refrigerator in the upper chamber, whereas the lower chamber is transmitted through the heat exchange plate in the lower chamber. Thus, the gas to be recovered is cooled and reliquefied.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic configuration diagram of a gas liquefaction recovery apparatus showing one embodiment to which the present invention is applied. In this gas liquefaction recovery device, the heat exchange plate (2) is arranged in the inner space of the heat insulating container (1), and the heat insulating container (1) is partitioned into an upper chamber (3) and a lower chamber (4). is there. In addition, the heat exchange plate (2) is formed of an upwardly convex end plate.
[0008]
In the upper chamber (3), an introduction path (5) for refrigerant gas such as liquefied argon, liquefied helium, liquefied hydrogen, and liquefied nitrogen opens, and a cold end (7) of the cryogenic refrigerator (6) faces. Yes. The refrigerant gas flowing into the upper chamber (3) is stored in a liquid state. The cryogenic refrigerator (6) is controlled to operate based on the detection result of the liquid level gauge (8) or pressure gauge for detecting the liquid level in the upper chamber (3). In this case, a predetermined amount of liquid refrigerant gas is always stored.
[0009]
On the other hand, in the lower chamber (4), there is an opening (9) for introducing a gas to be recovered that is released in order to maintain a low temperature during transfer and filling of liquefied gas, electronic measuring instruments, superconducting experimental equipment, and the like. In the lower chamber (4), impurity removal filters (10) are mounted in a plurality of stages. The leading end of the gas to be collected (9) opens toward the reflecting plate (11) arranged facing the heat exchange plate (2) constituting the ceiling of the lower chamber (4) at a small interval. Thus, the ejected gas to be collected can be efficiently brought into contact with the heat exchange plate (2).
[0010]
A replenishment gas passage (12) communicates with the recovery gas introduction passage (9), and a refill gas cylinder (13) is connected to the replenishment gas passage (12). In addition, a vacuum pump (15) is attached to the vacuum drawing path (14) branched from the replenishing gas path (12).
[0011]
In the figure, reference numeral (16) denotes a reliquefied gas take-out pipe communicating with the bottom of the lower chamber (4), and (17) denotes a refrigerant gas take-out pipe communicating with the bottom of the upper chamber (3).
[0012]
In the reliquefaction recovery apparatus configured as described above, the cold energy stored in the liquefied refrigerant gas stored in the upper chamber (3) is transmitted to the heat exchange plate (2). On the other hand, the gas to be recovered collected at the gas discharge site is introduced into the lower chamber (4) from the gas to be recovered introduction path (9). The gas to be recovered is condensed and liquefied because it is ejected in contact with the heat exchange plate (2) cooled by the cold heat of the refrigerant gas at the time of introduction. In addition, since the lower chamber (4) is equipped with the impurity removal filter (10) in a plurality of stages, the liquefied gas to be recovered becomes high purity, and the liquefied gas to be recovered is taken out and used. Can do.
[0013]
At this time, even if the gas to be recovered and the refrigerant gas are the same type of gas, there is a difference between the retained thermal energy in the liquid state and the retained thermal energy in the gaseous state, and in the upper chamber (3), Since the cooling energy is replenished by the low-temperature refrigerator, the gas to be recovered introduced into the lower chamber (4) is cooled, and the condensation is continuously performed.
[0014]
【The invention's effect】
In the present invention, the inside of the heat insulating container is divided into two upper and lower chambers, the upper chamber is formed in the refrigerant gas chamber, the lower chamber is formed in the recovered gas chamber, and the cryogenic refrigerator is placed with the cold head facing the upper chamber. Since a certain amount of refrigerant gas is stored in a liquid state in the upper chamber, the science and science that uses vaporized gas or liquefied gas discharged from the transfer and filling site of liquefied gas introduced into the lower chamber The vaporized gas discharged from the device can be cooled by the retained heat energy of the liquefied refrigerant gas stored in the upper chamber and reliquefied. Thereby, the vaporized gas that has been conventionally discarded can be recovered and reused, and the effective utilization rate of the expensive liquefied gas can be increased.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a gas liquefaction recovery apparatus showing an embodiment to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Thermal insulation container, 2 ... Heat exchange plate, 3 ... Upper chamber, 4 ... Lower chamber, 6 ... Cryogenic refrigerator, 7 ... Cold end of cryogenic refrigerator, 10 ... Impurity removal filter.

Claims (3)

The inside of the heat insulating container (1) is divided into two upper and lower chambers by a heat exchange plate (2), and the cold end (7) of the cryogenic refrigerator (6) is positioned in the upper chamber (3). The refrigerant gas is stored in the liquid state at the same time, the gas to be recovered is introduced into the lower chamber (4), and the gas to be recovered is liquefied and recovered by the retained heat of the liquefied refrigerant gas stored in the upper chamber (3). Gas liquefaction recovery device designed to do. The gas liquefaction recovery apparatus according to claim 1, wherein an impurity removal filter (10) is mounted in the lower chamber (4). A gas liquefaction recovery apparatus in which the refrigerant gas is liquefied argon, liquefied nitrogen, liquefied hydrogen, or liquefied helium, and the gas to be recovered is any of argon gas, helium gas, or hydrogen gas.

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