JPS6247400A - Cooler in drycleaning apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a dry cleaning device for nuclear peripheral equipment,
The present invention relates to a cooling device in a dry cleaning device that can be used in a general industrial dry cleaning device or the like.

(Prior art) Work clothing used in the radiation controlled area of a nuclear facility is washed by a washing machine installed in the controlled area.
It is reused after removing radioactive materials and other contamination.

In order to reduce the amount of water used for washing, dry cleaning equipment has recently been adopted as washing equipment for controlled areas at nuclear facilities, replacing conventional washing with water. Instead, cleaning is performed using R113 (1-lichlorotrichloroethane, boiling point: approximately 48°C), which is an organic solvent. R113 used for cleaning is expensive and is not suitable for safety reasons. Instead of being discharged outside the device and disposed of as is, as in the case of washing with water, all of the waste is collected and reused within the device.

R113 remaining in the items to be washed after washing is evaporated from the items by hot air drying, and recovered using a condenser or activated carbon.

Since a large amount of material to be washed is generated in a nuclear facility, the dry cleaning equipment used there is required to have a large processing capacity.

On the other hand, the items to be washed are mainly work clothes that are worn directly on the skin and contain a large amount of moisture such as sweat. Furthermore, since the clothes are worn by an unspecified number of people, it is necessary to dry them with hot air of 100° C. or higher in order to speed up the drying of the items to be washed and from a sanitary perspective.

However, when such high-temperature drying is performed, the wall temperature of the processing tank containing the items to be washed rises to 70 to 80 degrees Celsius, so it is necessary to replace the items to be washed and restart operation immediately after the drying process is completed. If an attempt is made to restart the process, the supplied solvent will contact the wall surface of the processing tank and evaporate rapidly, which not only increases the loss of solvent but also increases the internal pressure of the apparatus, which may cause damage. Therefore, simply increasing the drying temperature requires a cooling period before the next operation, which has the drawback of reducing the ability of the dry cleaning apparatus to process the items to be washed.

(Problems to be Solved by the Invention) The present invention attempts to solve problems in conventional dry cleaning equipment, such as damage to the equipment due to high temperature drying, loss of solvent, and reduction in processing capacity due to the cooling period. It is something.

(Means for Solving the Problems) Therefore, the present invention provides a water cooling jacket outside the laundry processing tank of a dry cleaning apparatus, and a cooling water tank used for the jacket at the bottom of the processing tank. , and has a circulation circuit that circulates and sends cooling water in the tank to the water cooling jacket by a pump, and a cooler connected to the circuit, and a circuit that connects the water cooling jacket, the cooling water tank, the pump, and the cooler. It consists of a closed loop, and is used as a means to solve problems.

(Function) The treatment tank, which has become hot due to high-temperature drying of the items to be washed, is rapidly cooled by the cooling water that flows through the water cooling jacket provided on the outer surface of the tank, making it possible to take out and put in the items to be washed. During this process, the temperature drops below the boiling point of the solvent.

If cooling water remains in the jacket when drying items to be washed at high temperatures, heat is absorbed by the cooling water and the drying capacity is reduced. To prevent this, drain the cooling water inside the jacket unless necessary.

In addition, the cooling water in the water-cooling jacket is discharged and stored in a tank at the bottom of the treatment tank by gravity, and the cooling water is cooled by a cooler using a pump connected to this tank and sent to the water-cooling jacket again.

(Example) An example of the present invention will be described below with reference to the drawings. The drawing is a system diagram of a dry cleaning apparatus showing an example of the present invention. Now, the object to be washed 13 is washed in the processing drum 2 housed in the processing tank 1. The processing drum 2 is rotated by a motor (not shown) outside the processing tank at a low speed during washing and drying, and at a high speed during centrifugal removal. During washing, solvent is supplied from the solvent tank 3 into the processing tank 1 by the solvent pump 4. Also, during washing, the solvent is removed from the processing tank 1 - solvent pump 4 →
The dirt is circulated from the filter 5 to the processing tank 1, and a portion of the dirt removed from the items to be washed is captured by the filter 5. After washing, part or all of the used solvent is sent to the distiller 6, and the evaporated solvent is condensed and recovered in the condenser 7.

After washing, move on to the drying process. In the drying process, the air in the process [1] is circulated by the fan 8 and heated by the air heater 10 to evaporate the solvent and water in the object 13 to be washed.

The air containing the evaporated solvent and water is cooled by an air cooler 9, and the solvent is condensed and recovered. Further, a small amount of solvent remaining in the items to be washed is adsorbed and recovered by the activation tank 11.

In addition, the solvent condensed in the condenser 7 and air cooler 9 is
Solvent tank 3 after passing through water separator 12 and separating waste water
will be returned to.

After the drying is completed, cooling water is passed from below into the jacket via the large mouth valve 19 by the processing tank cooling water pump 16. At this time, the vent valve 18 is opened and automatically closed when the jacket is filled with cooling water. The cooling water is discharged from the upper part of the jacket 14, passes through the cooling water tank 15, and is circulated again by the pump 16. Note that the cooling water is cooled by passing through a cooler 21 such as a chiller unit or a cleaning tower, or by providing a cooling coil 17 in the cooling water tank 15.

After cooling of the treatment tank is completed, the large mouth valve 19 is closed, and the vent valve 18 and drain valve 20 are opened to drain water by gravity. The discharged cooling water is stored in the cooling water tank 15.

Due to high temperature drying of the items to be washed, the temperature of the processing tank wall is 70-80℃.
The boiling point of the solvent (R113) (
47.6°C) or below.

Here, the amount of M in the processing tank of the dry cleaning equipment is approximately 200 kg, and the specific heat is approximately 0.11 Kcal/kg.
℃, the temperature difference before and after cooling the processing tank is 40℃, and the amount of heat to be removed is 200X0.11X40-880K
If we try to remove this in 1 minute using cooling water with a jacket inlet temperature of 25°C, the required flow rate is 880 Xcal (3525) ('C) X 1 (Kcal/kg'c
) X 1 (minutes) = approximately 88 (j!/min).

(Effects of the invention) As explained in detail above, the present invention is configured to cool a processing tank that has become high temperature by using a water cooling jacket,
Since it is possible to start the next operation immediately, solvent loss during the next operation and the work efficiency of laundry workers are improved.
The processing efficiency of items to be washed is improved. In addition, since the cooling water tank is provided at the bottom, the water inside the jacket can be drained by gravity except when necessary, and it is possible to prevent heat loss during drying of washed items.

Furthermore, since the jacket, the tank for storing cooling water, the pump, and the cooler are connected in a closed loop circuit, it is possible to circulate and reuse the cooling water.

[Brief explanation of the drawing]

The drawing is a system diagram of a dry cleaning apparatus showing an embodiment of the present invention. Explanation of main parts of the diagram 1--Processing tank 2-Processing drum 14-Water cooling jacket 15-Cooling water tank 16-Cooling water pump 21-Cooler

Claims (1)

[Claims] A water cooling jacket is provided outside the laundry processing tank of the dry cleaning equipment, and a cooling water tank used for the jacket is provided at the bottom of the processing tank, and the cooling water in the tank is circulated to the water cooling jacket by a pump. A cooling device for a dry cleaning apparatus, comprising a circulation circuit for water supply, a cooler connected to the circuit, and a closed loop circuit for connecting the water cooling jacket, cooling water tank, pump, and cooler.