Processing Equipment and Method for Waste Flexible Container Bags

Abstract

To provide a treatment facility and a treatment method for a waste flexible container bag that can perform the operation of drying and sieving the muddy contaminated soil adhering to the waste flexible container bag used for transporting and storing contaminated soil contaminated by radioactive substances while maintaining a good working environment without diffusing dust. 【Solution means】Cover the entire treatment site including the unsealing yard 1 of the flexible container bag containing the waste flexible container bag, the drying yard 2 of the waste flexible container bag, the separation yard 3, and the residue filling yard 4 with a tent 5, and cover the drying yard 2 and the separation yard 3 with small tents 6 respectively. By sending the air in each small tent 6 to the dust collector 71 through the exhaust fan 72, the dust is collected, and the inside of each small tent 6 is made into a negative pressure so that the air in the tent 5 is introduced into the small tent 6.

Description

Technical Field

[0001] The present invention relates to a treatment facility and a treatment method for waste flexible container bags used when transporting and storing contaminated soil contaminated by radioactive substances.

Background Art

[0002] Due to the accident at the Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power caused by the Great East Japan Earthquake on March 11, 2011, extensive soil contamination by radioactive substances occurred in various prefectures in Tohoku with Fukushima Prefecture as the center. In Fukushima Prefecture, topsoil containing radioactive cesium was removed after considering the land type (paddy fields, fields) and the degree of contamination. Specifically, the topsoil was scraped off by heavy machinery, filled into flexible container bags, then transferred to a predetermined temporary storage location, and further transported to an intermediate storage facility after temporary storage for predetermined treatment.

[0003] At the intermediate storage facility, the soil is taken out from the flexible container bags and stored in a soil storage facility in the intermediate storage facility equivalent to a management-type disposal site (see, for example, Patent Documents 1 to 6).

[0004] At this time, a large number of waste flexible container bags (including those broken into small pieces when the bags are torn, and referred to as "waste flexible container bags" in this specification) are mostly packed in new flexible container bags with muddy contaminated soil attached, so there is a problem that they cannot be processed (recycling treatment or incineration treatment) as they are.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Summary of the Invention

Problems to be Solved by the Invention

[0006] To address this problem, in order to process (recycle or incinerate) a waste flexible container bag with muddy contaminated soil attached, it is conceivable to dry the muddy contaminated soil attached to the waste flexible container bag, sieve it off, and then process it.

[0007] The present invention aims to provide a processing facility and a processing method for a waste flexible container bag that can perform the operation of drying and sieving off the muddy contaminated soil attached to the waste flexible container bag used when transporting and storing contaminated soil contaminated with radioactive substances while maintaining a good working environment without diffusing dust.

Means for Solving the Problems

[0008] To achieve the above object, the processing facility and the processing method for a waste flexible container bag of the present invention are a processing facility for a waste flexible container bag used when transporting and storing contaminated soil, and include an unsealing yard for the flexible container bag containing the waste flexible container bag, a drying yard for the waste flexible container bag, a separation yard, and a residue stuffing yard The entire processing site including the yards is covered with a tent, and the drying yard and the separation yard are each covered with a small tent. The air in each small tent is sent to a dust collector through an exhaust fan to collect dust, and the inside of each small tent is made negative pressure so that the air in the small tent does not leak into the tent.

[0009] In this case, the drying yard covered with the small tent can be partitioned into a plurality of sections.

[0010] Also, a blower and a heater can be provided in the drying yard covered with the small tent.

[0011] Also, an air supply fan for supplying outside air can be provided in the drying yard covered with the small tent.

[0012] A rotary separator and a vibrating separator can be provided in the separation yard, and the rotary separator and the vibrating separator can be individually covered with a small tent.

[0013] Also, to achieve the same object, the method for treating waste flexible container bags of the present invention is a method for treating waste flexible container bags in the above-described waste flexible container bag treatment facility, characterized in that drying is promoted by inverting the waste flexible container bags introduced into the drying yard.

[0014] Also, the waste flexible container bags at a predetermined processing work date and time opened in the opening yard can be introduced into one section of the drying yard partitioned into a plurality of sections.

[0015] Also, by setting the air volume of the exhaust fan to be larger than the air volume of the air supply fan, the inside of the small tent can be made into a negative pressure so that the air inside the small tent does not leak out of the tent.

Advantages of the Invention

[0016] According to the processing equipment and processing method of the waste flexible container bag of the present invention, the entire processing site including the opening yard for the flexible container bag containing the waste flexible container bag, the drying yard for the waste flexible container bag, the sorting yard, and the residue filling yard is covered with a tent. The drying yard and the sorting yard are each covered with a small tent, and the air in each small tent is sent to a dust collector through an exhaust fan to collect dust. At the same time, the inside of each small tent is set to a negative pressure so that the air in the small tent does not leak into the tent. In this way, the muddy contaminated soil adhering to the waste flexible container bag used when transporting and storing the contaminated soil contaminated by radioactive substances can be dried and sieved without diffusing dust and while maintaining a good working environment.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the processing equipment and processing method of the waste flexible container bag of the present invention will be described based on the drawings.

[0019] Figs. 1 to 5 show an embodiment of the processing equipment for the waste flexible container bag of the present invention. The processing facility for waste flexible container bags of the present invention covers the entire processing site including the unsealing yard 1 for flexible container bags containing waste flexible container bags, the drying yard 2 for waste flexible container bags, the separation yard 3, and the residue stuffing yard 4 with a tent 5. The drying yard 2 and the separation yard 3 are each covered with a small tent 6. By sending the air in each small tent 6 to the dust collector 71 through the exhaust fan 72, dust is recovered, and the inside of each small tent 6 is kept at a negative pressure so that the air in the small tent 6 does not leak into the tent 5.

[0020] The flexible container bag containing the waste flexible container bag carried into the processing facility is first unsealed in the unsealing yard 1. By using a mechanical device, such as a fork grapple, to perform a sieving operation multiple times, the attached substances such as soil and mud lumps that can be easily removed are separated and removed. After that, the waste flexible container bag is transferred to the next drying yard 2 using a mechanical device, such as a wheel loader. In addition, the flexible container bag (outer flexible container bag) with few attached substances after emptying the waste flexible container bag it contained is appropriately processed (recycling process or incineration process) and is collectively housed in a new flexible container bag.

[0021] The entire drying yard 2 is covered with a small tent 6, and further, its interior is partitioned into a plurality of sections, in this embodiment, 6 sections, using partition members 61 such as curtains.

[0022] Each section of the drying yard 2 partitioned into a plurality of sections is provided with an exhaust fan 72, and the exhaust fan 72 is connected to the dust collector 71 through an exhaust duct 73 for air supply.

[0023] In addition, each section of the drying yard 2 partitioned into a plurality of sections is supplied with outside air from the air supply fan 74 through the air supply duct 75.

[0024] Here, the exhaust fan 72 and the air supply fan 74 are set to operate constantly except during maintenance, and by setting the air volume of the exhaust fan 72 to be larger than that of the air supply fan 74, the inside of the drying yard 2 covered by the small tent 6 is made to have a negative pressure so that the air inside the small tent 6 does not leak into the tent 5.

[0025] In addition, a blower 21 and a heater 22 are provided in each section of the drying yard 2 partitioned into a plurality of sections. The blower 21 is a large-air-volume swinging type blower (for example, "MRV series (ceiling-mounted)" manufactured by Suiden Corporation, maximum air volume: 215 m 3 / min.). Six units (36 units in total) are installed on the ceiling surface of the small tent 6 for each section. Thereby, the entire surface of the waste flexible container bag stored in a laying manner in each section of the drying yard 2 is dried by blowing the maximum air volume of air. The air containing the evaporated moisture in each section is sucked by the exhaust fan 72, dust-removed by the dust collector 71, and then exhausted outside the tent 5. The heater 22 is used to raise the temperature inside the small tent 6 and lower the relative humidity in winter when the average temperature drops below 10 °C and the drying efficiency decreases. General-purpose heaters such as air conditioners and warm air fans can be used, and the warm air generated by the heater 22 is blown into the small tent 6. Thereby, by raising the temperature inside the small tent 6 to 15 - 20 °C, the relative humidity can be lowered and drying can be promoted.

[0026] Here, in the operation of the drying yard 2 partitioned into a plurality of sections, for example, at the predetermined processing work date and time opened in the opening yard 1, for example, the waste flexible container bags opened in one day can be introduced into one section of the drying yard 2 partitioned into a plurality of sections. Incidentally, since the drying yard 2 is partitioned into six sections, one section can be operated with, for example, one week (number of operating days: 5 days) as one cycle. As a result, the muddy contaminated soil adhering to the waste flexible container bag can be uniformly and surely dried.

[0027] In addition, the waste flexible container bags stored in each section of the drying yard 2 so as to be spread out can be dried by promoting the drying by performing an inversion process (turning upside down). The inversion process is repeated a plurality of times at predetermined time intervals, for example, two or more times a day, according to the state of the muddy contaminated soil adhering to the waste flexible container bag. In order to prevent the generation of dust, this inversion process is performed using a rotary fork grapple (for example, "GS-40LJV" manufactured by Iwafuji Kogyo Co., Ltd.) capable of efficiently performing the inversion process by rotating the fork portion 360 degrees with the blower 21 and the heater 22 stopped.

[0028] The waste flexible container bag with the muddy contaminated soil adhering thereto dried in the drying yard 2 is transferred to the sorting yard 3 of the next process using a mechanical device, for example, a wheel loader.

[0029] The sorting yard 3 performs an operation of sifting out the contaminated soil from the waste flexible container bag with the muddy contaminated soil adhering thereto dried in the drying yard 2. In the sorting yard 3, a rotary primary separator (mesh size: 100 mm) 31, a vibrating separator (mesh size: 100 mm) 32, and a rotary secondary separator (mesh size: 40 mm) 33 are provided, each individually covered with a small tent 6, each sucked by an exhaust fan 72, dust-removed by a dust collector 71, and then exhausted outside the tent 5. Here, the exhaust fan 72 is always operated except during maintenance so that the inside of the drying yard 2 covered with the small tent 6 becomes negative pressure, and the air inside the small tent 6 does not leak into the tent 5. And in the sorting yard 3, the waste flexible container bag with the adhering muddy contaminated soil transferred from the drying yard 2 is introduced from the hopper 34 into the rotary primary sorter (mesh size: 100 mm) 31, and further sorted by the vibrating sorter (mesh size: 100 mm) 32 to recover container residues (mesh on) of 100 mm or more. What has passed through the rotary primary sorter (mesh size: 100 mm) 31 and the vibrating sorter (mesh size: 100 mm) 32 is further sorted by the rotary secondary sorter (mesh size: 40 mm) 33 into container residues (mesh on) of 40 mm or more and soil (mesh pass) of less than 40 mm, and recovered.

[0030] In this way, the waste flexible container bag (container residue) from which the contaminated soil (adhered matter) has been sifted out in the sorting yard 3 is transferred to the residue filling yard 4 and collectively stored in a new flexible container bag for appropriate treatment (recycling treatment or incineration treatment).

[0031] Note that the ventilation inside the tent 5 is such that outside air is supplied into the tent 5 through the air supply device 76 provided at an appropriate location of the tent 5, and at the same time, the air inside the tent 5 is dust-removed through the dust collector 71 (which can be shared with the dust collector 71 that recovers dust from the exhaust of each small tent 6), and then exhausted outside the tent 5. According to this waste flexible container bag treatment facility and treatment method, the muddy contaminated soil adhering to the waste flexible container bag used when transporting and storing the contaminated soil contaminated by radioactive substances can be dried and sifted out while maintaining a good working environment without diffusing dust, preventing the diffusion from the dust generation source to the entire tent, and reducing the exposure of the workers working inside the tent to dust.

[0032]

[0033] ​As described above, the processing equipment and method for waste flexible container bags of the present invention have been described based on their embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configuration can be appropriately changed without departing from the spirit thereof.

Industrial Applicability

[0034] The processing equipment and method for waste flexible container bags of the present invention can dry and sift the muddy contaminated soil adhering to the waste flexible container bags used when transporting and storing contaminated soil contaminated by radioactive substances, while maintaining a good working environment without diffusing dust. Therefore, it can be suitably used for the purpose of processing waste flexible container bags.

Explanation of Signs

[0035] 1 Unsealing Yard 2 Drying Yard 21 Blower 22 Heater 3 Separation Yard 4 Residue Filling Yard 31 Rotary Primary Separator 32 Vibration Separator 33 Rotary Secondary Separator 34 Hopper 5 Tent 6 Small Tent 61 Partition Member 71 Dust Collector 72 Exhaust Fan 73 Exhaust Duct 74 Air Supply Fan 75 Air Supply Duct 76 Air Supply Device

Claims

1. This is a processing equipment for waste flexible container bags used when transporting and storing contaminated soil, characterized in that the entire processing site, including the opening yard for flexible container bags containing waste flexible container bags, the drying yard for waste flexible container bags, the sorting yard and the residue filling yard, is covered with a tent, and the drying yard and the sorting yard are each covered with a small tent, and the air inside each small tent is sent to a dust collector via an exhaust fan to collect dust, and negative pressure is created inside each small tent to prevent the air inside the small tent from leaking into the tent.

2. 2. The waste flexible container bag processing facility according to claim 1, wherein the drying yard covered with the small tent is divided into a plurality of sections.

3. 2. The waste flexible container bag processing facility according to claim 1, wherein a blower and a heater are provided in the drying yard covered with the small tent.

4. 2. The waste flexible container bag processing facility according to claim 1, further comprising an air supply fan for supplying outside air to the drying yard covered with the small tent.

5. 2. The waste flexible container bag processing equipment according to claim 1, characterized in that a rotary sorter and a vibrating sorter are provided in the sorting yard, and the rotary sorter and the vibrating sorter are individually covered by small tents.

6. A method for processing waste flexible container bags in a waste flexible container bag processing facility described in any one of claims 1 to 5, characterized in that the drying of the waste flexible container bags introduced into a drying yard is promoted by inverting the waste flexible container bags.

7. 3. A method for processing waste flexible container bags in the waste flexible container bag processing equipment described in claim 2, characterized in that waste flexible container bags opened in the opening yard for a specified processing work date and time are introduced into one section of a drying yard divided into multiple sections.

8. 5. A method for processing waste flexible container bags in the waste flexible container bag processing equipment described in claim 4, characterized in that the air volume of the exhaust fan is set greater than the air volume of the intake fan, thereby creating negative pressure inside the small tent and preventing air inside the small tent from leaking out into the tent.

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