JP2599086B2 - Method and apparatus for recovering fluorine-based gas - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to halon used as a fire extinguishing agent and freon 114 used as a refrigerant for a refrigerator.
The present invention relates to a method and an apparatus for recovering a fluorine-based gas such as.

[0002]

2. Description of the Related Art Conventionally, fluorine-based gas has been used as a refrigerant or a fire extinguisher for refrigerators by utilizing its chemical and thermal properties. When the fire extinguisher was inspected regularly or the refrigerator was discarded, fluorine-based gas was released to the atmosphere.

[0003]

However, since the emission of fluorine-based gas into the atmosphere causes depletion of the ozone layer surrounding the earth, the emission of certain types of fluorine-based gas into the atmosphere is subject to regulation. Has also been discontinued. However, in certain fields, since it may be necessary to use halon gas or fluorine-based gas, there is a need for a fluorine-based gas recovery technology, but there is no method for recovering fluorine-based gas with high purity at present. .
The present invention has been made in view of such a point, and an object of the present invention is to provide a recovery method and a recovery apparatus capable of recovering a large amount of fluorine-based gas with high purity.

[0004]

In order to achieve the above-mentioned object, the present invention relates to a method for storing a liquefied fluorine-based gas stored as a mixture of a liquid and a gas in a fluorine-based gas storage container such as a fire extinguisher. When recovering from a container, the liquid component in the storage container is first sent to the recovery tank under its own pressure, then the gas component taken out of the storage container is compressed, and then the low-temperature refrigerant
In introducing the cooled liquefied tank is cooled by cooling liquefied, so as to recover and deliver the liquefied gas in the recovery tank, times
Vaporized gas from the collection tank is introduced into the cooling liquefaction tank and reliquefied
It is characterized in that the the to.

[0005]

According to the present invention, the liquid component of the liquefied fluorine-based gas stored as a mixture of liquid and gas in the fluorine-based gas storage container is sent to the recovery tank under its own pressure, and then taken out of the storage container. After compressing gaseous components, use low-temperature refrigerant
Cooled liquefied is introduced into the cooling liquefaction vessel are cooled, so as to recover and deliver the liquefied gas in the recovery tank, the recovery
The vaporized gas from the tank is introduced into the cooling liquefaction tank and reliquefied.
So that the inside of the fluorine gas storage container
In the cooling liquefaction tank, a pressure difference always occurs based on the temperature difference.
Is stored in a fluorine gas storage container.
The fluorinated gas is cooled and liquefied in a cooling liquefaction tank and can be reliably recovered in a liquid state.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an apparatus for recovering halon gas from a halon fire extinguisher using the method of the present invention. In the figure, reference numeral (1) denotes a halon fire extinguisher storing liquefied halon gas to be collected, (2) a liquefied halon gas recovery tank, (3) a compressor, and (4) a cooling liquefaction tank.

A recovery path (5) connected to the halon fire extinguisher (1) comprises a liquid component recovery path (6) and a gas component recovery path (7) arranged in parallel. 7) Compressor
(3) and a cooling liquefaction tank (4) are arranged in series. A short circuit (8) branching out from the liquid component recovery path (6) is connected between the compressor (3) and the cooling liquefaction tank (4) in the gas component recovery path (7).

[0008] The compressor (3) comprises a multi-stage compressor,
On the inflow side to the compressor (3), a pressure reducing valve (9) and a passage opening / closing valve
(10) is interposed so that high-pressure gas of a predetermined pressure or more (for example, 5 kg / cm ² or more) does not flow into the suction side of the compressor (3).

The cooling and liquefaction tank (4) has containers (12) and (13) arranged inside the refrigerant storage tank (11) in a vertically continuous state, and a connecting path (C) connecting the containers (12) and (13). A flow path on-off valve (15) is arranged at 14). The upper container (1
The aforementioned gas component recovery path (7) is connected to the connection path (14) on the 2) side. In the refrigerant storage tank (11), a methacrylic liquid is stored as a refrigerant, and the methacrylic liquid is cooled to 213 to 233K by a cooling device.

Then, the upper and lower containers (12) are set in the refrigerant storage tank (11).
A liquid level gauge (16) is arranged along (13). This level gauge (1
6) the upper end of the upper container (12) and the lower end of the lower container
The lower ends of (13) are communicated with each other so that the amount of the halon solution in the upper and lower containers (12) and (13) can be detected.

Next, a procedure for recovering halon gas from a fire extinguisher using this system will be described. First, using the compressor (3) arranged in the line, the collection tank
(2) Exhaust from inside the piping. In this case, collection path (5)
The valve (17) arranged at the connection part to the target container is closed, and each valve interposed in the liquid component recovery path (6) is opened to open the compressor (3) of the gas component recovery path (7). Open the valve located on the suction side and open the compressor in the gas component recovery path (7).
Close the valve located on the discharge side of (3).

Next, the target container (halon fire extinguisher) (1) is connected to the recovery path (5), the valve arranged on the suction side of the compressor (3) is closed, and the recovery path (5) is connected to the target container. Valve located at connection
Open (17). Then, the halon liquid in the target container (1) is pumped to the collection tank (2) by the self-pressure in the target container (1). When the internal pressure of the target container (1) and the internal pressure of the collection container (2) are equalized, the supply of halon stops.

Next, a liquid component recovery path (6) and a recovery tank
In addition to blocking communication with (2), the liquid component recovery path (6)
The liquid component and the gas component remaining in the target container (1) are supplied to the liquefaction cooling tank (4) by the container's own pressure by communicating the short circuit path (8) between the gas container and the gas component recovery path (7). The halon liquid flowing into the liquefaction cooling tank (4) is stored in the lower container (13), and the halon gas in the flowing gas is liquefied in the liquefaction cooling tank (4).
It is cooled and liquefied by the internal refrigerant, and stays in the lower container (13).

When the internal pressure in the target container (1) decreases and the residual gas in the target container (1) stops flowing under its own pressure, the liquid component recovery path (6) is shut off and the gas component is removed. By operating the compressor (3) by communicating the recovery path (7), the gas component remaining in the target container (1) is suctioned and pressurized, supplied to the cooling liquefaction tank (4), and cooled and liquefied. Tank (4)
Liquefaction by heat exchange with the refrigerant.

When the liquid level gauge (16) detects that a predetermined amount of liquid halon has been stored in the upper and lower containers (12) and (13) in the cooling and liquefaction tank (4), the gas discharge line ( 18) is communicated with the gas component recovery path (6), and the lower vessel (13) is communicated with the recovery tank (2) to collect the liquid halon stored in the upper and lower vessels (12) and (13). (2) Feed by head difference. At this time, the halon gas in the recovery tank (2) is
It cools and liquefies when passing through (11).

When nitrogen gas for pressurization is sealed in the target container (1), the nitrogen gas is cooled in the refrigerant tank (11) during recovery using the compressor (3). in separating the nitrogen Halon gas a liquefied state by utilizing the fact that not liquefied. When the liquid level gauge detects that the amount of the halon liquid stored in the upper and lower containers (12) and (13) has reached a predetermined amount, the lower container (13) is communicated with the collection tank (2) and separated before the separation. The liquid halon is pumped to the recovery tank (2) at a nitrogen gas pressure of. At this time, when the liquid level in the lower container (13) is detected by the liquid level gauge (16) to drop to a predetermined liquid level, the communication between the lower container (13) and the collection tank (2) is cut off. Thus, nitrogen gas is prevented from flowing into the recovery tank (2).

The nitrogen gas remaining in the upper vessel (12) in the cooling and liquefaction tank (4) is discharged from a gas discharge line derived from the upper vessel (12). At this time, the connection path (14) with the lower container (13) is shut off so that the halon gas is not released.

[0018] In the above embodiment has been described with the Halon recovery from halon extinguishers, it can also be used for the recovery of chlorofluorocarbons used as a refrigerant for refrigerators. In this case, even if oil or nitrogen is mixed in the chlorofluorocarbon gas, the mixed component and chlorofluorocarbon can be separated and collected.

[0019]

According to the present invention, the liquid component of the liquefied fluorine-based gas such as halon or chlorofluorocarbon stored in the fluorine-based gas storage container as a mixture of liquid and gas is sent to the recovery tank under its own pressure. Then, after compressing the gas component taken out from the storage container, it is introduced into a cooling liquefaction tank cooled with a low-temperature refrigerant and liquefied by cooling, and this liquefied gas is sent to a collection tank and collected. In addition, the fluorine-based gas can be reliably recovered in a liquid state. In addition, collection
Gas discharge line from the compressor in the gas component recovery path
Is also connected downstream, so that
The vaporized gas components are introduced into the cooling liquefaction tank due to the pressure difference.
From the compressor inside the fluorine gas storage container.
When starting up, it is possible to utilize the full suction capacity of the compressor.
High efficiency of fluorine gas recovery
You.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of the device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Storage container, 2 ... Recovery tank, 3 ... Compressor, 4 ... Cooling liquefaction tank, 5 ... Recovery path, 6 ... Liquid component recovery path, 7 ... Gas component recovery path, 11 ... Refrigerant storage tank, 12 ... Upper vessel , 13 ... lower container.

Claims (4)

(57) [Claims] When recovering a liquefied fluorinated gas stored in a storage container (1), first, a liquid component in the storage container (1) is sent to a recovery tank (2) by its own pressure. Then, after compressing the gas component taken out of the storage container (1),
The liquefied gas is introduced into a cooling liquefaction tank (4) cooled by a low-temperature refrigerant and liquefied, and the liquefied gas is sent to a recovery tank (2). The vaporized gas in the recovery tank (2) is cooled. Liquefaction tank
A method for recovering a fluorine-based gas configured to be introduced into (4) and reliquefied . In recovering the liquefied fluorine-based gas stored in the storage container (1) together with the pressurizing gas, first, the liquid component in the storage container (1) is recovered by its own pressure in a recovery tank.
(2) A cooling liquefaction tank that compresses the gas component taken out from the storage container (1) and then cools it with a low-temperature refrigerant
Is introduced into (4) is separated into a pressurizing gas and liquefied fluorine gas by cooling, constitutes the liquefied liquid fluorine-based gas to deliver the collection tank (2), recovery tank
The vaporized gas from (2) is introduced into the cooling liquefaction tank (4) and reliquefied.
The method for recovering a fluorine-based gas configured as described above. 3. A collection path (5) connected to a storage container (1) storing liquefied fluorine-based gas is connected to a collection tank (2), and a liquid component collection in which the collection paths (5) are arranged in parallel. Road (6)
And a gas component recovery path (7), and a gas component recovery path (7).
Liquefied cooling tank (4) cooled with compressor (3) and low-temperature refrigerant
And exhaust gas from the upper part of the recovery tank (2).
The outlet line (18) is located below the compressor (3) in the gas component recovery path (7).
Fluorine gas recovery device connected to the upstream side . 4. A liquefied cooling tank (4) is provided inside a refrigerant storage tank (11) with two vertically continuous containers (12) and (13), and the two containers (12) and (13) are connected to each other. Gas component recovery path at the connection
The fluorine gas recovery apparatus according to claim 3, wherein (7) is connected.