JPS6235250A - dry cleaning equipment - 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 relates to a dry cleaning device, and more specifically to a dry cleaning device for use in a nuclear power plant that performs washing using a mixed washing liquid of a solvent and water.

[Prior Art] At nuclear power plants, in order to perform work within a radiation controlled area, work clothes dedicated to the controlled area are used. These work clothes become contaminated with water-soluble stains such as radioactive contaminants, various workplace dusts, oils, and human sweat due to work in controlled areas. Therefore, when reusing them, they must be washed, but because the dirt contains radioactive materials, dry cleaning methods are being used that generate less secondary waste. However, the dry cleaning method has a problem in that it is inferior in its ability to remove water-soluble stains such as sweat from the human body.

In response to this, the Dry Clean and Jung methods have recently been proposed, which combine main washing with a two-phase washing liquid made by adding water to a solvent, pre-washing with a solvent, or rinsing (Japanese Patent Application Laid-Open No. 59-225399).

In this method, the water-soluble stains can be dissolved in the water in the two-phase liquid, so it is possible to increase the removal rate of the water-soluble stains.

[Problems to be Solved by the Invention] Generally, the removal rate of water-soluble stains increases as the amount of water in the two-phase liquid increases. However, as the amount of water increases, a large amount of heat is required to dry-bomb the items to be washed, and water has a higher temperature and latent heat of vaporization than liquids such as Freon 113 used as solvents, so purification by distillation is necessary. The conditions for work inside the six power plants, which are difficult to clean and therefore increase the amount of waste liquid, vary significantly depending on location, time of year, and season, and the amount of water-soluble dirt such as juice that adheres to work clothes also changes. If the amount of water in the two-phase liquid is set to a constant amount, ice containing almost no dirt will be discharged as waste liquid if the item to be washed has little water-soluble dirt, and vice versa. The removal rate will be lower. As described above, the prior art has a drawback in that washing cannot be carried out with the optimum amount of water in the two-phase liquid in response to fluctuations in the amount of water-soluble dirt adhering to the items to be washed.

The present invention solves the above-mentioned drawbacks of the prior art and optimizes the amount of water (5) in a two-phase liquid containing water and a solvent in response to changes in the amount of water-soluble dirt adhering to items to be washed. The purpose of the present invention is to provide an adjustable dry cleaning device.

[Means for Solving the Problems] The present inventors have focused on the fact that the amount of water-soluble dirt adhering to items to be washed is approximately proportional to the amount of water, which accounts for most of the sweat generated by the human body. A moisture meter is installed that measures the amount of moisture in the laundry before washing with a moisture sensor and outputs an electrical signal according to the moisture meter, and based on the output signal, a mixed washing liquid of solvent and water is prepared. A control device was provided to adjust the mixing ratio of the mixture. As the moisture meter, for example, a high frequency moisture meter that is generally used to measure the moisture content of wood can be used. Preferably, the moisture sensor is mounted on a heavy hanging frame so that the probe plate of the single-nuclear moisture sensor is located on the bottom surface, and the probe plate is pressed against the object to be washed by the load. Make it.

[Function] In the dry cleaning device of the present invention, the amount of moisture in the laundry before washing is measured by the moisture sensor, an electrical signal corresponding to the amount of moisture is outputted by the moisture meter, and this output signal is Based on this, the control device adjusts, for example, the amount of water supplied to the mixing tank, so that a mixed washing liquid is prepared in accordance with the amount of water-soluble dirt on the items to be washed.

[Embodiment] FIG. 1 shows an embodiment of a dry cleaning apparatus according to the present invention, and is a schematic diagram of a dry cleaning apparatus for a nuclear power plant.

The dry cleaning device of this embodiment has a washing drum lO
1 solvent tank 12, new solvent tank 14, distiller 16
, distillation condenser 18, solvent and water mixture tank 20
, water tank 22, surfactant tank 24, moisture sensor 2
6. Moisture meter 28, control device 30, and each piping and pump connecting these.

It is composed of valves, etc.

To explain the device of this embodiment in more detail along with its operation, first, the object W to be washed, such as work clothes used in a nuclear power plant, is placed in the object container 32, and the moisture sensor 26 detects the object W to be washed. It is placed on top of W. Items to be washed W are work clothes made of cotton or blended materials (for example, mixed fibers of cotton and polyester), and are contaminated by dust, metal rust, oil, and dirt from human bodies during various operations within the power plant. has been done. Some of the radioactive materials are incorporated into the dust and metal rust. Dirt from the human body is also transferred to work clothes through sweat. This includes 0-15wt% of water, l/20-1/20% of the water to be washed.
In addition to 40% salt, it also contains trace amounts of organic acids and fats and oils, making it a water-soluble stain. Moisture sensor 26 is the second
As shown in the figure, the probe plate 38 is housed in a heavy frame 36 suspended by a hanging string 34 so that the probe plate 38 is located on the bottom surface, and the load of the frame 36 causes the probe plate 38 to move against the object to be washed. It is designed to be pressed against W. Moisture meter 28 receives a detection signal from moisture sensor 26 via cable 40, and outputs an electrical signal to control device 30 according to the analyzed moisture content based on this signal. According to research conducted by the present inventors, the amount of water-soluble dirt from the human body is approximately proportional to the amount of water that makes up the majority of sweat;
Since the object to be washed W is made of cloth made of the material listed above, it was found that a sensor for a high-frequency moisture meter, which is generally used to measure moisture in wood, is suitable as a moisture sensor for it. ing. Therefore, the electrical signal output from the moisture meter 28 is approximately proportional to the amount of water-soluble dirt attached to the object W to be washed. The control device 30 is a moisture meter 28
A valve 42 that adjusts the flow rate of water from the water tank 22 to the mixed liquid tank 20 based on an electrical signal output from the valve 42
Controls the opening degree.

After the moisture content of the laundry item W is measured, it is placed from the laundry container 32 into the washing drum IO, and washing is started.

First, solvent is supplied to the washing drum 10 from the solvent tank 12 through the three-way valve 44, the solvent pump 46, the three-way valve 48, and the solvent filter 50. The solvent is usually Freon 1.
13 is used. When the solvent enters the washing drum 10, the drum begins to rotate, and the solvent is further pumped through the three-way valve 44, the solvent pump 46, and so on. It is circulated through a three-way valve 48 and a solvent filter 50 to perform pre-washing with the solvent. During this time, dust, rust, oil, and some water-soluble dirt adhering to the object W to be washed are dropped into the solvent and further collected by the solvent filter 50. Most of the radioactive substances taken into the object W to be washed are removed by pre-washing with a solvent. Pre-washing is carried out for 3-5 minutes. When the pre-washing is completed, the solvent in the washing drum 10 is returned to the solvent tank 12 through the three-way valve 44 while the washing drum 10 is rotated at high speed to remove liquid.

The returned solvent is stored in the solvent tank 12 and reused until the amount of radioactive material contained in the solvent exceeds a certain amount.

When the prewashing is completed and the solvent is extracted from the washing drum IO, a mixed washing liquid in which a surfactant is added to a mixed liquid of water and a solvent is supplied from the mixed liquid tank 20 to the washing drum 10. Here, the mixed washing liquid is a mixed liquid tank 20 containing water and surfactant in the solvent used in rinsing, which will be explained later.
It is made in addition to. At this time, the surfactant is passed from the surfactant tank 24 through the valve 52 to a ratio of 0.5 to 2
%Added. Further, water is added from the water tank 22 via a valve 42, and the opening degree of the valve 42 can be adjusted by an electrical signal from the control device 30.
As described above, the amount of water supplied is adjusted according to the amount of water in the item W to be washed.

When water and surfactant are added to the solvent, the mixture pump 54
Mixing is performed using bypass line 56 at . During mixing, water and solvent form an emulsion due to the action of surfactants. These operations are performed during prewashing.

When the mixed washing liquid enters the washing drum 10, water present as an emulsion in the solvent comes into contact with the washed item W in zero-line washing where the main washing is performed while the washed item W is immersed in the mixed washing liquid. Water-soluble dirt, which is dirt from the human body, is removed from the laundry.
remove from Therefore, as the amount of water relative to the solvent increases, the opportunity for contact with the object W to be washed increases, and as shown in FIG. 3, the removal rate of water-soluble stains increases. However, in this case, a large amount of heat is required to dry the items to be washed afterwards, and as will be described later, a large amount of distillation residue is discharged from the distiller 16 that processes the used mixed washing liquid. In the example, the amount of water in the mixed liquid is adjusted according to the amount of water-soluble dirt attached to the object W to be washed by the action of the moisture sensor 26 described above, so that the removal rate of water-soluble dirt and the discharge The zero-line washing, which can be operated under optimal conditions taking into account the amount of residual liquid, is carried out for about 2 to 5 minutes.When the zero-line washing is completed, the washing drum 10 is rotated at high speed to remove liquid. Meanwhile, the mixed washing liquid after use in the washing drum IO is removed by the three-way valve 4.
4. Solvent pump lO1 three-way valve 48, three-way valve 58
It is then sent to the distiller 16. The distilled solvent is supplied as a new liquid from the distillation condenser 18 to the new liquid tank 14.

The distillation residue contains water-soluble dirt, water, and surfactants.
Discharged as waste.

When the main washing is completed and the mixed washing liquid is discharged from the washing drum IO, the new liquid (solvent after distillation) is passed from the new liquid tank 14, through the new liquid pump 60 and the three-way valve 62, to the washing drum as a rinsing liquid. 10. When the supply of the new liquid is finished, the washing drum 10 rotates with the item W to be washed immersed in the rinsing liquid, and rinsing is performed. By rinsing, most of all the contaminants attached to the object W to be washed are removed. When rinsing is completed, the rinsing liquid is removed while the washing drum 10 rotates at high speed.
It is supplied to the mixed liquid tank 20 via the three-way valve 44, the solvent pump 46, the three-way valve 48, and the three-way valve 58, and is used to prepare the mixed washing liquid as described above.

After the above operations, the laundry item W is taken out from the laundry drum 10 through a drying process, and the washing process is completed.

With washing by dry cleaning like this.

Most of dust, rust, oil, and water-soluble stains generated from the human body can be removed, and therefore radioactive substances contained in dust and rust and malodorous substances contained in water-soluble stains are also removed.

[Effects of the Invention] As explained above, according to the dry cleaning device of the present invention, the amount of moisture in the items to be washed before washing is measured by the moisture sensor, and the amount of moisture in the items to be washed is determined according to Since a mixed washing liquid is prepared, the removal rate of water-soluble stains is high, and washing can be carried out under optimal conditions with fewer places for residue that can become a stain.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a dry cleaning apparatus according to the present invention, FIG. 2 is a side view showing a moisture sensor portion of the same embodiment, and FIG. It is a graph which shows the relationship between and the water-soluble dirt removal rate. 10...Washing drum 12...Solvent tank 20...Mixed liquid tank 22...Water tank 26...Moisture sensor 28...Moisture meter 30...Control device 34...Hanging string 36 ... Frame 38 ... Probe plate W ... Item to be washed Applicant Hitachi Plant Construction Co., Ltd. Figure 2

Claims (2)

[Claims] (1) A dry cleaning device that uses a mixed washing liquid of a solvent and water, which measures the amount of moisture in the laundry before washing with a moisture sensor and outputs an electrical signal according to the amount of moisture. What is claimed is: 1. A dry cleaning device comprising: a meter; and a control device that adjusts a mixing ratio of a mixed washing liquid of a solvent and water based on the output signal. (2) The moisture sensor is attached to a heavy hanging frame so that the probe plate of the moisture sensor is located at the bottom, and the probe plate is pressed against the item to be washed by the load. A dry cleaning apparatus according to claim (1).