JPH082410B2 - Volatile substance recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] For example, a recovery device for recovering CFCs as a refrigerant and volatile substances such as organic solvents such as trichloroethane, which are released into the atmosphere during periodic inspection work of refrigerators and the like. With regard to the above, a volatile substance recovery device that can improve the recovery rate of volatile substances by recovering the gas that has been re-vaporized by the volatile substances that have been recovered in the recovery container, and thus can minimize environmental pollution In order to do so, a cooling container equipped with a cooling means, a gas introduction line for introducing a gas in which a volatile substance is vaporized into the cooling container, and a volatile liquid which is cooled and condensed in the cooling container to be liquefied A collection container for collecting the substance, a liquid introduction pipe for introducing the liquefied volatile substance into the collection container, and a re-vaporized gas introduction pipe for returning the gas in which the volatile substance is re-vaporized in the collection container into the cooling container. The road Including.

[Field of Industrial Application] The present invention is, for example, a recovery for recovering a chlorofluorocarbon gas as a refrigerant or a volatile substance such as an organic solvent such as trichloroethane, which is released into the atmosphere in a periodic inspection work of a refrigerator. Regarding the device.

Today, refrigerant gas such as CFCs for refrigerant and cleaning,
Environmental problems are occurring due to the release of volatile substances such as organic solvents such as trichloroethane into the atmosphere.

Further, for example, a refrigerator or the like is obliged to perform a regular inspection work for refrigerant leaks once a year. Especially, in a semiconductor device production plant, etc., the CFC gas released into the atmosphere during the regular inspection work is taken from the intake port. Inhaled into the factory, 300 ℃
When it is heated above the above, it decomposes into chlorine gas, fluorine gas, etc., causing product abnormalities and equipment deterioration.

Therefore, it is necessary to improve the recovery rate of volatile substances.

[Problems to be Solved by the Related Art and Invention] Conventionally, for example, in a regular inspection work that is performed once a year in a refrigerator, first, a refrigerant liquid (CFC) is extracted, and then a vacuum inside the refrigerator is used. Pulling work,
The vaporized refrigerant in this evacuation work has been released to the atmosphere as it is.

Further, even after recovering the vaporized refrigerant by using an air-cooling extraction device after the refrigerant liquid extraction work of the refrigerator, the recovery capacity of the air-cooling extraction device decreases when the degree of vacuum inside the refrigerator becomes higher than 170 mmHg. Therefore, switch to vacuum pump pulling,
The refrigerant gas was released into the atmosphere as it was.

Further, since it is not possible to carry out the recovery work by sealing the recovery container for containing the recovered refrigerant liquid, the refrigerant is re-evaporated into the atmosphere to be released.

For this reason, the recovery rate of the refrigerant during the regular inspection work of the refrigerator is low, and 10 to 20% of the refrigerant is released to the atmosphere at every regular inspection.

The present invention can improve the recovery rate of volatile substances by recovering the gas in which the volatile substances recovered in the recovery container are re-vaporized,
Therefore, it is an object of the present invention to provide a volatile substance recovery apparatus that can minimize environmental pollution.

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention.

In the figure, 1 is a cooling container provided with a cooling means, 2 is a gas introduction pipe line, and a cooling container 1 is a gas for which a volatile substance is vaporized.
Introduce inside. Reference numeral 3 denotes a recovery container for recovering the liquefied volatile substance that is cooled and condensed in the cooling container 1, and 4 denotes a liquid introducing pipe for introducing the liquefied volatile substance into the recovery container 3. Reference numeral 5 denotes a re-vaporized gas introduction pipe, which returns the gas in which the volatile substance has been re-vaporized in the recovery container 3 to the cooling container 1.

[Operation] The gas in which the volatile substance introduced into the cooling container 1 by the gas introduction conduit 2 is vaporized is cooled and condensed by the cooling means and liquefied. The liquefied volatile substance is introduced into the collection container 3 via the liquid introduction pipe line 4 and collected. Further, the gas in which the volatile substance is revaporized in the recovery container 3 is returned to the inside of the cooling container 1 by the revaporized gas introduction pipe line 5, and the cooling container 1
It is cooled and condensed inside and liquefied.

Therefore, the recovery rate of volatile substances is improved, and thus environmental pollution can be minimized.

As an example of the cooling means, a cooling substance 15 that is vaporized by heat exchange can be used.In this case, the cooling substance 15 is a gas in which a volatile substance is vaporized, the cooling substance 15 and the cooling substance. By the heat exchange of the substance 15 with the vaporized gas, the volatile substance is cooled and condensed to be liquefied, and the heat exchange causes the volatile substance to be vaporized into a gas lighter than the vaporized gas. It has the following effects. That is, in the cooling container 1, the cooling substance is
15 is vaporized by heat exchange, and the gas in which the cooling substance 15 is vaporized and the cooling container 1 cooperate with each other to seal the gas in which the volatile substance is vaporized. The inside of the container is kept at a predetermined pressure by the vaporized gas of the cooling substance 15, and it is possible to prevent water vapor from entering from the outside without completely sealing the upper part of the cooling container 1. If the upper part of the cooling container 1 is not completely sealed as described above, only the gas in which the cooling substance 15 is vaporized from the upper part of the container is external even if the pressure in the cooling container 1 is increased. Since it is released to the outside, the vaporized volatile substance is prevented from being released to the outside.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic configuration diagram showing an embodiment of a recovery device of the present invention, and FIG. 3 is a process explanatory view showing a case where the recovery device of FIG. 2 is used for refrigerant recovery of a refrigerator, and FIG. The same components as those shown in are attached with the same reference numerals and described.

As shown in FIG. 2, the cooling container 1 includes a container body 11 and a lid.
It has 12 and. The container body 11 is made of a heat insulating material,
It has a bottomed tubular shape. The lid 12 always closes the upper end opening of the container body 11 by its own weight to prevent gas (especially water vapor) from entering from the outside and to release the pressure increase in the cooling container 1. Has become.

A mounting plate 13 having a large number of through holes 14 is provided in an intermediate portion of the container body 11. On the mounting plate 13, a plurality of dry ices 15 as cooling means are stacked in a tower shape, and a space 16 is formed between the dry ices 15. Further, a lid member 17 having a heat insulating property is detachably provided on the inner upper end portion of the container body 11 above the dry ice 15.
The lid member 17 is made of an elastic material such as sponge, and is prevented from falling on the dry ice 15 by the frictional force with the inner wall surface of the container body 11.

The gas introducing line 2 is located below the mounting plate 13 and is provided with a container body 11
The gas in which the volatile substance 18 such as CFC, which is the refrigerant of the refrigerator, is vaporized is introduced into the cooling container 1.

Therefore, for example, when a chlorofluorocarbon gas is introduced into the cooling container 1, the chlorofluorocarbon 18 spreads in the space 16 between the dry ices 15 and is cooled and condensed, and becomes a liquid chlorofluorocarbon 18 and accumulates at the bottom of the cooling container 1. At this time, the pressure in the cooling container 1 rises due to the carbon dioxide (CO ₂ ) generated by the vaporization of the dry ice 15, and this carbon dioxide passes through the lid member 17 and the gap between the lid 12 and the container body 11 is increased. Is discharged to the outside of the cooling container 1. or,
Since the carbon dioxide filled in the cooling container 1 acts as a seal, invasion of water vapor from the outside of the cooling container 1 is prevented.

The cooling container 1 is placed on a support table 20 having a plurality of legs 21, and the cooling container 1 is provided by casters 21a provided at the lower end of each leg 21 to a predetermined place where a recovery operation should be performed. Be moved.

The recovery container 3 is arranged between the legs 21 of the support 20, and is connected to the cooling container 1 via the liquid introduction pipe line 4.
A valve 19 is provided at an intermediate portion of the liquid introduction pipe line 4, and the cooling container 1 is opened by periodically opening the valve 19.
The liquid flon 18 accumulated at the bottom of the container is recovered in the recovery container 3 by the drop.

The re-vaporized gas introduction pipe line 5 is connected to the cooling container 1 below the gas introduction pipe line 2 so that the CFCs 18 recovered in the recovery container 3 are re-vaporized to generate the CFC gas in the cooling container 1. To prevent the re-vaporized CFC gas from being released into the atmosphere.

Next, an example in which the recovery device configured as described above is used to recover the refrigerant (fluorocarbon) of the refrigerator will be described with reference to FIG.

First, as shown in FIG. 3A, nitrogen (N ₂ ) gas 31 is injected into the refrigerant circuit (not shown) of the refrigerator 30, and most of the refrigerant liquid in the refrigerant circuit is cooled by the pressure of the N ₂ gas 31. Extract into the liquid recovery container 32. Then, the refrigerant liquid recovery container 32 is connected to the gas introduction line 2
Is connected to the cooling container 1 in advance. Thereby, the gas in which a part of the refrigerant liquid contained in the refrigerant liquid recovery container 32 is vaporized is recovered.

Next, as shown in FIG. 2B, an air-cooling extraction device 33 is connected to the refrigerant circuit (not shown) of the refrigerator 30, and this extraction device 33 is connected.
At this time, the refrigerant inside the refrigerator is evacuated to a vacuum of about 170 mmHg to liquefy the refrigerant liquid remaining in the refrigerant circuit, and the extracted vaporized refrigerant is cooled and liquefied by the extraction device 33 to collect the refrigerant liquid. Collect to 32. Also in this case, the refrigerant liquid recovery container
32 is connected to the cooling container 1 through the gas introduction pipe line 2,
A part of the refrigerant liquid stored in the refrigerant liquid recovery container 32 recovers the vaporized gas.

Then, as shown in FIG. 3C, a vacuum pump 34 is connected to a refrigerant circuit (not shown) of the refrigerator 30, and the inside of the refrigerator is evacuated to a vacuum to extract the vaporized refrigerant into a gas introduction pipe. It is introduced into the cooling container 1 via the line 2.

The following table shows the results of recovering CFCs of 600 refrigeration tons of the turbo refrigerator 600 by the steps (a) to (c).

As shown in the above table, by performing the steps (a) to (c) in the recovery apparatus of this embodiment, 75 kg of CFC can be recovered, and dry ice required for this 15
Was 50 kg.

As described above, in the recovery device of the present embodiment, the vaporized refrigerant that has conventionally been released into the atmosphere can be cooled and condensed to be recovered as a liquid refrigerant. Further, by returning the CFC gas generated by the re-evaporation of the liquid CFC 18 collected in the recovery container 3 into the cooling container 1 through the re-vaporized gas introduction pipe line 5, the re-evaporated CFC gas is released into the atmosphere. In addition to being able to prevent the above, it can be collected as a liquid refrigerant by cooling and aggregating again.

Therefore, the recovery rate of CFCs is improved, and thus environmental pollution can be minimized, and expensive refrigerants (CFCs) can be efficiently recovered.

In addition, with the recovery device of this embodiment, inexpensive dry ice 15
Can be used to cool and agglomerate the vaporized refrigerant to collect it as a liquid refrigerant, and to prevent the invasion of water vapor by filling the cooling container 1 with the carbon dioxide generated by the vaporization of the dry ice 15. Therefore, it is possible to prevent water from being mixed into the liquid refrigerant collected in the cooling container 1 having a simple structure in a semi-sealed state.

Further, in the recovery device of the present embodiment, if dry ice 15 is vaporized, it can be replenished to perform continuous operation.

Further, since the casters 21a are provided on the legs 21 of the support 20, the cooling container 1 can be moved and transported to an arbitrary place to recover the volatile substance.

Although the cooling means is dry ice 15 in this embodiment, it may be a normal refrigeration cycle.

Further, in the present embodiment, the case where the refrigerant is used for the recovery of the refrigerant during the periodical inspection work of the refrigerator has been described, but it may be used for the recovery of volatile substances such as an organic solvent such as trichloroethane.

[Effects of the Invention] As described in detail above, according to the invention of claim 1, it is possible to improve the recovery rate of the volatile substance by recovering the gas in which the volatile substance recovered in the recovery container is revaporized. Therefore, there is an excellent effect that environmental pollution can be minimized. Further, according to the invention of claim 2, in addition to the above effects, there is an excellent effect that the structure is simple because there is no need to provide a dedicated drive device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is a schematic configuration diagram showing an embodiment of a recovery device of the present invention, and FIG. 3 is a refrigerator of the recovery device of FIG. FIG. 6 is a process explanatory view showing a case where the refrigerant is used to recover the refrigerant. In the figure, 1 is a cooling container, 2 is a gas introduction conduit, 3 is a recovery container, 4 is a liquid introduction conduit, and 5 is a re-vaporized gas introduction conduit.

Claims (2)

[Claims] 1. A cooling container (1) provided with a cooling means, a gas introducing pipe line (2) for introducing a gas in which a volatile substance is vaporized into the cooling container (1), and a cooling container (1). ), A collection container (3) that collects the liquefied volatile substance that has been cooled and condensed in), a liquid introduction pipe line (4) that introduces the liquefied volatile substance into the collection container (3), and a collection container (3) ), And a re-vaporized gas introduction pipe (5) for returning the gas in which the volatile substance has been re-vaporized into the cooling container (1). 2. The cooling means is a cooling substance (15) which is vaporized by heat exchange, a gas in which a volatile substance is vaporized, and a cooling substance (15) and a gas in which the cooling substance (15) is vaporized. The heat exchange of the volatile substance cools and condenses the vaporized gas to liquefy it, and the heat exchange vaporizes the volatile substance into a gas lighter than the vaporized gas.
The volatile substance recovery device described.