JPS6345275Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an organic solvent recovery device used in dry cleaning equipment.

A conventional dry cleaning apparatus is constructed as shown in FIG. 1, and the cleaning process includes a washing process, a liquid removal process, a drying process, and a deodorizing process in this order. In the cleaning process, the object 1 to be washed is immersed in a highly volatile solvent such as perchloroethylene or 1,1,1-triclethane to remove dirt. Furthermore, in the liquid removal step, the washing drum 2 is rotated at high speed to centrifugally separate the solvent. In addition, in the drying process, the air inside the cleaning device is passed through a water cooler 4 and a heater 5 by a circulation fan 3 to the washing drum 2.
Circulate within. That is, the temperature of the air is raised by the heater 5 to evaporate the solvent adhering to the object to be washed 1, and the evaporated solvent gas is guided to the water-cooled cooler 4 and heated to 32 to 35
Cool to about ℃. There, the solvent gas is condensed and liquefied and recovered, but the lower the cooling temperature, the better the solvent gas contained in the air is removed due to the saturation concentration. Therefore, for example, if the solvent is perchlorethylene, it is impossible to reduce the concentration of the solvent in the air to 250 g/m ³ or less at a cooling temperature of about 35°C, and if this continues, a strong odor will be produced on the item 1 to be washed. remain.

Therefore, in the deodorizing process, in order to remove odors and cool the object 1 to be washed, the fresh air damper 6 is opened to take in outside air, which is brought into contact with the object 1 to be washed to dilute the solvent gas concentration. , to be discharged from the exhaust damper 7 to the outside of the machine.

However, although the exhaust gas is diluted, it initially releases solvent gas that reaches tens of thousands of ppm, creating an air pollution problem. Therefore, for the purpose of countermeasures and resource saving by recovering solvent, the duct 8
A solvent adsorption tank 9 is provided through the tank 9, and the solvent gas is adsorbed by an activated carbon layer 10 provided in the tank 9, and only clean air is released into the atmosphere.

In this solvent adsorption tank 9, when the activated carbon reaches saturation with the adsorbed solvent gas, water vapor is sprayed onto the activated carbon to evaporate the solvent, thereby performing so-called desorption.
The evaporated solvent gas is guided to a cooler (not shown), condensed, liquefied, and recovered. However, the running cost of the solvent adsorption tank 9 using activated carbon is almost proportional to the amount of solvent adsorbed;
As the amount of water, etc. used increases, running costs increase accordingly. Therefore, there is a need for a dry cleaning solvent recovery device that can reduce the number of times of desorption as much as possible.

Apart from this, the temperature of the air entering the dry cleaning apparatus from the fresh air damper 6 varies depending on the season, and the cooling effect on the items 1 to be washed differs. Especially in the summer, the cooling effect decreases, and if the laundry is taken out from the laundry drum 2 and left uncooled, wrinkles may appear on the laundry 1.

The present invention was developed in view of the above circumstances, and its purpose is to reduce the running cost of dry cleaning equipment, and to cool the laundry items effectively regardless of the season. The purpose of the present invention is to provide a dry cleaning solvent recovery device that can be used for dry cleaning.

That is, the present invention connects the exhaust port and fresh air intake of the laundry drum through a plurality of control valves and a regenerator cooler, and removes the solvent gas from the air inside the laundry drum in the first stage of the deodorizing process. a first solvent recovery circuit that circulates air condensed by the regenerator cooler and cooled to the laundry drum; a refrigerator connected to the regenerator cooler; and a first solvent recovery circuit provided upstream of the fresh air intake of the laundry drum. A solvent adsorption tank is provided which is connected to the fresh air intake duct and the first solvent recovery circuit via a plurality of control valves and is equipped with an activated carbon layer, and is introduced from the fresh air intake duct in the second stage of the deodorization process. a second solvent recovery circuit that supplies outside air to the solvent adsorption tank through the fresh air intake and the washing drum; a cooler connected to the solvent adsorption tank; and a cooler connected to the regenerator and the cooler. 1. A dry cleaning solvent recovery device characterized by comprising a water separator with a water separator.

The present invention will be described below with reference to illustrative embodiments.

FIG. 2 is an explanatory diagram showing a dry cleaning solvent recovery device, which includes control valves I, G, J, A first solvent recovery circuit 14 is connected to the solvent recovery circuit 14 via control valves H and C, and a second solvent recovery circuit 15 is connected to this circuit 14 via control valves H and C.

The first solvent recovery circuit 14 is connected to the regenerator cooler 1 through a duct 16 provided with a control valve I at the exhaust port 12.
7 are installed.

This regenerator cooler 17 is connected to a refrigerator 19 via a pipe 18 and to a water separator 21 via a pipe 20. This regenerator cooler 17 utilizes the specific heat of a solid, and its internal structure includes, for example, as shown in FIG. 3, a cooling coil 24 connected to piping 18 is arranged in a meandering manner within a tank 22 covered with a cold insulating material 22a. , through which a refrigerant such as R12 flows. Furthermore, a perforated plate 25 such as a wire mesh is laid at the bottom of the tank 22, and on this
Ceramic balls 26 such as 4" are filled.
A circulation fan 27 is also provided on the side of the tank 22 to enhance the cooling effect from the cooling coil 24 to the ceramic balls 26.

The regenerator cooler 17 is connected to the fresh air intake 13 of the washing drum 11 by a duct 28. The duct 28 is provided with control valves G, J, and B, and a fresh air intake duct 29 equipped with a control valve A is attached between the control valves J and B.

On the other hand, the second solvent recovery circuit 15 includes a duct 30 provided with a control valve H between the duct 16 and the duct 28.
A duct 31 branched from the duct 28 is connected to a solvent adsorption tank 32. This duct 31
is equipped with a control valve C and a dry air intake duct 33 equipped with a control valve D.

The solvent adsorption tank 32 is composed of an activated carbon layer 34 and a heat storage layer 35, and the activated carbon layer 34 side is connected to the control valve E.
The fan 37 is connected to the fan 37 by a duct 36 provided therein. Further, the solvent adsorption tank 32 is provided with a steam pipe 38 and a solvent gas pipe 39 equipped with a control valve F.
This solvent gas pipe 39 is connected to the water separator 21 via a cooler 40 such as a water-cooled condenser. This water separator 21 is provided with a solvent recovery pipe 41 and a waste water recovery pipe 42, so that the solvent can be separated and recovered.

In the dry cleaning solvent recovery device configured as described above, when the dry cleaning device completes the drying process and enters the deodorizing process, the damper of the exhaust port 12 switches from the position shown by the dashed line to the position shown by the solid line. opens, and the exhaust gas circulates through the duct 16, regenerator cooler 17, duct 28, and washing drum 11 as shown by broken lines. At this time, control valves A, C, and H are closed, and control valves B, G, I, and J are open. Furthermore, the regenerator cooler 17 is cooled to about -20° C. by the refrigerator 19 before entering the deodorizing process of the dry cleaning device.

The solvent gas passing through the regenerator cooler 17 is estimated to have a high concentration of about 250 g/m ³ at the beginning of the deodorizing process, but it is cooled and condensed by the regenerator cooler 17, liquefied, and sent to the water separator 21. The solvent is separated from water and recovered from the solvent recovery pipe 41. In this case, this step is carried out for about 2 minutes in a normal dry cleaning machine.

As the exhaust gas circulates through the regenerator cooler 17 in this way, the high concentration solvent gas at the beginning of the deodorizing process is recovered and becomes low in concentration (estimated concentration 25 g/m ³ ).
Control valves A, C, E, and H are opened, and J, I, and G are closed, and the fan 37 is operated as necessary, and fresh air flows into the washing drum 11 from the duct 28 as shown by the two-dot chain line. and ducts 16, 30, 31,
The solvent is discharged outdoors through the solvent adsorption tank 32, duct 36, and fan 37. In this case, control valves D and F are closed. The exhaust gas passes through the automatic on-off valve H and is prevented from passing through the regenerator cooler 17 by using the duct 1.
This is to prevent moisture in the air entering from 6 from condensing inside the regenerator cooler 17.

When the solvent gas with such a low concentration flows into the solvent adsorption tank 32, it is adsorbed by the activated carbon layer 34. When the deodorizing process is completed in this manner, the items to be washed are taken out in a sufficiently cooled state.

Then, the damper of the exhaust port 12 is closed (the position indicated by the dashed line), the control valve B is closed, and the dry cleaning apparatus starts the next cleaning process. When the next cleaning process starts, the regenerator cooler 17 is cooled by the refrigerator 19, and is cooled to about -20°C by the time the drying process of the dry cleaning apparatus is completed.

On the other hand, in the solvent adsorption tank 32, the activated carbon layer 34
When the solvent is adsorbed, control valves C, D, and E are closed, and control valve F is opened, and water vapor flows into the upper part of the activated carbon layer 34 from the steam pipe 38, desorbing the solvent from the activated carbon layer 34. The desorbed solvent passes through the solvent gas pipe 39 and is liquefied by the cooler 40, flows into the water separator 21, where the solvent is separated from water and recovered from the solvent recovery pipe 41. When the attachment and detachment are completed, control valve F closes, D and E open, and drying fan 37 operates to take in air from dry air intake duct 33. At the time of desorption, the air collects heat from the heat storage layer 35 heated by steam and becomes warm air, which dries and regenerates the moist activated carbon layer 34. It is necessary that this desorption operation is completed before the deodorizing process starts, and it is particularly preferable that it be completed between the washing process of the cleaning process and the liquid removal process.

According to such a device, since the highly concentrated solvent gas exhausted at the beginning of the deodorizing process is collected by the regenerator cooler 17 without passing through the solvent adsorption tank 32, the activated carbon layer 34 is recovered in one deodorizing process. Since the amount of solvent adsorbed by the solvent is drastically reduced, the amount of activated carbon used in the solvent adsorption tank 32 can be reduced, and the concentration of exhaust gas discharged outdoors can be sufficiently reduced.

Furthermore, the amount of steam, water, etc. required for solvent recovery is reduced, and since the regenerator type cooler 17 is used, it is possible to use a refrigerator 19 with a small capacity. Running costs can be reduced to about 1/6.

Furthermore, in the deodorizing process, air cooled by the regenerator cooler 17 is first blown into the washing drum 11, and then outside air is blown into the washing drum 11, which effectively lowers the temperature of the laundry and deodorizes it, thereby preventing wrinkles from forming on the laundry. It can be prevented. In addition, the influence of outside temperature on the solvent gas sent to the washing drum 11 is reduced.
Stable solvent recovery is performed.

In addition, in this invention, the regenerator is cooled by a refrigerator, and the solvent gas is cooled by this cooler.If the method of directly cooling the refrigerator is used, the solvent gas can be cooled in a short time (approximately 2 minutes). Since cooling is required, a large-capacity refrigerator is required, which increases running costs, but by using this method, the deodorizing load for 2 minutes can be stored as cold while other processes (approximately 30 minutes) are being performed. This is because the capacity of the refrigerator can be reduced to lower running costs.

Note that the regenerator type cooler is not limited to the one shown in FIG. 3, but may be one shown in FIGS. 4 and 5, for example. This regenerator type cooler 17 utilizes the latent heat of fusion of a regenerator, and has a cooling coil 24 that flows through a refrigerant through a pipe 18 from a refrigerator in a meandering manner in a tank 22 covered with a refrigerant 22a. There is. As shown in FIG. 5, a heat transfer tube 50 is provided outside the cooling coil 24, and a cool storage agent 51 is sealed between the heat transfer tube 50 and the cooling coil 24. As the heat transfer tube 50, a tube having a large surface area per unit length, such as a spiral tube, a bellows tube, or a finned tube, is effective.

Since the cold storage agent 51 undergoes volumetric expansion when solidified by the refrigerator, the heat transfer tube 50 and the cooling coil 24
In order to absorb the stress, a space equal to the volume expansion plus α is maintained between the two and the volume expansion is absorbed.

Further, it is desirable that the solidification temperature of the cold storage agent 51 is lower than the solidification temperature of the solvent gas. For example, in the case of perchlorethylene, the cold storage agent 51 is required to solidify at about -20°C. When the solvent gas comes into contact with the solidified regenerator 51, the regenerator melts and exchanges heat using its latent heat of fusion (generally 30 to 50 Kcal/Kg), and the solvent gas is condensed and liquefied, leading to the water separator. It is collected from the pipe 20.

As explained above, the present invention combines the condensation recovery in the regenerative cooler and the number of adsorptions by activated carbon, thereby reducing the number of times the activated carbon is desorbed. Since the laundry is cooled, the cooling effect can be increased. Furthermore, since a regenerator type cooler is used, the refrigerator can have a small capacity and its running cost can be reduced, and various other remarkable effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional dry cleaning device and dry cleaning solvent recovery device, FIG. 2 is an explanatory diagram of a dry cleaning solvent recovery device showing an embodiment of the present invention, and FIG. A cross-sectional view of the regenerator cooler used in the recovery device, Fig. 4 is a cross-sectional view showing another regenerator cooler, and Fig. 5 is a cross-sectional view of the regenerator cooler used in the recovery device.
FIG. 2 is a sectional view of a main part of the regenerator cooler shown in the figure. 11...Washing drum, 12...Exhaust port, 13...
... Fresh air intake, 14 ... First solvent recovery circuit, 15 ... Second solvent recovery circuit, 16, 28,
30, 31, 36... Duct, 17... Regenerator cooler, 18, 20... Piping, 19... Freezer, 2
1... Water separator, 22... Tank, 22a... Cold pack, 24... Cooling coil, 25... Perforated plate, 2
6...Ceramic ball, 27...Circulation fan,
29... Fresh air intake duct, 32... Solvent adsorption tank, 33... Dry air intake duct, 34...
activated carbon layer, 35... heat storage layer, 37... fan,
38... Steam piping, 39... Solvent gas piping, 40
... Cooler, 41 ... Solvent recovery pipe, 50 ... Heat transfer tube, 51 ... Cold storage agent.

Claims (1)

[Scope of utility model registration request] The exhaust port and fresh air intake of the laundry drum are connected via multiple control valves and a regenerator cooler, and in the first stage of the deodorization process, the solvent gas in the air inside the laundry drum is condensed by the regenerator cooler. a first solvent recovery circuit that circulates the cooled air to the washing drum; and a refrigerator connected to the regenerator cooler;
A fresh air intake duct provided upstream of the fresh air intake of the washing drum, and a solvent adsorption tank connected to the first solvent recovery circuit via a plurality of control valves and provided with an activated carbon layer, a second solvent recovery circuit that supplies outside air introduced from the fresh air intake duct to the solvent adsorption tank through the fresh air intake and the washing drum in the second stage of the deodorization process; a cooler,
A dry cleaning solvent recovery device comprising the above regenerator cooler and a water separator connected to the cooler.