JP2001194491A - Solid/liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To respond even in anomaly disturbing apparatus, such as bearing sticking and facilitate cleaning of the inner surface of a separator vessel. SOLUTION: A motor 13 for separation operation is placed on the upper surface of a placement slab 1 through a bearing box 2, and a separator vessel 7 is attached to the axis of rotation 5 of the motor 13. Surrounding the separator vessel 7, a casing 6 is attached to the lower surface of the placement slab 1. In a casing 6, a pipe-fixing seat 21 is attached, and to the pipe-fixing seat 21, a cleaning liquid pipe 22 is attached so as to reach the upper part in the separator vessel 7. As a result, the separator vessel 7 inside can be cleaned, without rotating the separator vessel 7 during cleaning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal solid-liquid separator suitable for, for example, a nuclear fuel reprocessing plant including a centrifugal clarifier, a centrifuge, and the like.

[0002]

2. Description of the Related Art A solid-liquid separator is a device for extracting useful solids or liquid by centrifuging a liquid containing solids. An example of a conventional typical solid-liquid separator will be described with reference to FIG.

In FIG. 7, reference numeral 1 denotes an installation slab, and a bearing box 2 is provided on an upper surface of the installation slab 1. An upper bearing 3 and a lower bearing 4 in the bearing housing 2 support a rotating shaft 5. ing. The rotating shaft 5 penetrates through the installation slab 1 and hangs downward, and a separation container 7 is fixed to a lower end thereof. This separation container 7 is surrounded by a casing 6 attached to the lower surface of the installation slab 1.

In FIG. 1, reference numeral 8 denotes a receiver attached to the inner surface of the casing 6, reference numeral 9 denotes a discharge pipe attached to the bottom of the casing 6, and reference numeral 10 denotes a liquid supply pipe for supplying the liquid to be separated without the separation vessel 7. Numeral 11 denotes a cleaning nozzle which sprays a cleaning liquid toward the inner surface of the separation container 7. Reference numeral 12 denotes a discharge hole connected to the receiver 8. 13 is a separation operation motor that rotates the rotating shaft 5, 14 is a cleaning operation motor, 15 is a spring mounted on the lower bearing 4, 16 is a damper, and 17 is a separation operation motor 13 and a cleaning operation motor 14. Switching clutch for switching,
Reference numeral 18 denotes a power transmission V-belt attached to the switching clutch 17.

[0005]

The mechanism of the centrifugal solid-liquid separator is such that the separation vessel 7 is rotated at a high speed by the separation driving motor 13 via the rotating shaft 5 to separate the liquid to be separated, for example, radioactive solids. In this method, the fuel solution containing the fuel is supplied to the inside of the separation vessel 7 through the liquid supply pipe 10, and the solid content is collected on the inner wall surface of the separation vessel 7 by centrifugal force.

As the separation operation is continued, the solid content becomes unbalanced and causes vibration. When the vibration increases, the main body of the separator such as the separation container 7 and the casing 6 vibrates and adversely affects the periphery. Or the separation performance itself is reduced. In addition, since a harmful load is applied to the upper bearing 3 and the lower bearing 4 that support the rotating shaft 5, the life of the bearings 3 and 4 is reduced. Furthermore, if the collected solid is left as it is, the temperature rises due to the heat of decay, and a radioactive substance such as ruthenium is released into the air.

In order to avoid this, after the separation operation is performed, the separation operation motor 13 is switched to the cleaning operation motor 14 by the switching clutch 17, and the cleaning liquid is injected from the cleaning nozzle 11 while rotating the separation container 7 at a low speed. To wash the solids,
Remove.

The cleaning nozzle 11 has a structure in which a part of the separation vessel 7 is cleaned by using a spray nozzle called a flat spray for spraying the cleaning liquid in a fan shape. Rotating is essential.

For this reason, a conventional solid-liquid separator for nuclear fuel reprocessing, for example, has a failure in a drive unit including a separation operation motor 13, a cleaning operation motor 14, and a switching clutch 17, and a failure in the upper bearing 3 and the lower bearing. In the event of an abnormality that hinders the main function of the device, such as the fixation of No. 4, there is a problem that the cleaning operation cannot be performed.

[0010] In order to solve this problem, it is necessary to constantly maintain a drive unit including electric appliances installed in the radiation control area in a healthy state, which requires a great deal of labor and cost. In addition, there is a problem that the radiation exposure time of the maintenance staff is increased and consumables and replacement parts periodically generated from the driving unit become radioactive waste.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By providing a mechanism for cleaning the entire surface of the separation container, the present invention has a function of enabling cleaning without relying on rotation of the separation container. An object of the present invention is to provide a solid-liquid separator having improved properties.

Further, the present invention reduces the maintenance time and the amount of replacement parts by streamlining the cleaning motor and the switching mechanism from the drive unit, thereby improving the economical efficiency. An object of the present invention is to provide a highly reliable solid-liquid separator with improved performance.

[0013]

According to a first aspect of the present invention, there is provided a motor for separating operation installed on an upper surface of an installation slab via a bearing box, and a rotary shaft attached to the motor and passing through a lower surface of the installation slab. A separation container having a lower end opening attached to the rotating shaft, a casing surrounding the separation container and attached to the lower surface of the installation slab, a pipe mounting seat provided in the casing, A fixed cleaning spray nozzle attached to a seat and extending into the separation container, a liquid supply nozzle penetrating the casing toward the inner surface of the separation container, and an outlet nozzle and a sludge discharge nozzle attached to the casing. And characterized in that:

According to the first aspect of the present invention, by providing a cleaning device having a fixed cleaning spray nozzle inside the separation container, the entire inner surface of the separation container can be easily simultaneously rotated without rotating the separation container. Can be washed, and safety is improved.

In addition, since a prime mover and a switching clutch for the cleaning operation of the separation container are not required, the drive unit is reduced in size and weight, and the seismic resistance is improved. The exposure of maintenance personnel is reduced, thereby improving maintainability. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving economic efficiency.

The invention of claim 2 is characterized in that a plurality of the fixed cleaning spray nozzles are arranged, and the plurality of spray nozzles each have a mechanism for switchingably supplying a cleaning liquid.

According to the second aspect of the present invention, the cleaning device is provided with two or more fixed cleaning spray nozzles inside the separation vessel, and the cleaning range is complemented by sequentially switching the system through which the cleaning liquid flows. By performing the washing stepwise, the inner surface of the separation container can be washed without rotating the separation container, and the safety is improved.

Since a prime mover and a switching clutch for the cleaning operation of the separation vessel are not required, the drive unit is reduced in size and weight and the earthquake resistance is improved, and parts and time required for maintenance are reduced by simplification of the structure. In addition, the exposure of maintenance personnel is reduced, and the maintainability is improved. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving the economic efficiency.

According to a third aspect of the present invention, there is provided a motor for separation operation installed on an upper surface of a mounting slab via a bearing box, a rotating shaft attached to the motor and passing through a lower surface of the mounting slab, A separation container having an attached lower end opening, a casing surrounding the separation container and mounted on the lower surface of the installation slab, a pipe mounting seat provided in the casing, and the separation container mounted on the pipe mounting seat. A movable cleaning spray nozzle extending into the inside, a liquid supply nozzle penetrating through the casing toward the inner surface of the separation container, and an outlet nozzle and a sludge discharge nozzle attached to the casing. And

According to the third aspect of the present invention, there is provided a cleaning device comprising a spray mounting seat movable by a cleaning liquid and having a single type of spray, one or more types or a plurality of different types of sprays mounted inside the separation container. By performing washing while changing the washing range, the inner surface of the separation container can be washed without rotating the separation container, and safety is improved.

Since a prime mover and a switching clutch for the cleaning operation of the separation vessel are not required, the drive unit is reduced in size and weight, thereby improving the earthquake resistance, and the simplification of the structure reduces parts and time required for maintenance. In addition, the exposure of maintenance personnel is reduced, and the maintainability is improved. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving the economic efficiency.

According to a fourth aspect of the present invention, a plurality of movable cleaning spray nozzles are provided, and each of the plurality of spray nozzles has a mechanism for selectively supplying a cleaning liquid.

According to the fourth aspect of the present invention, a single or one or more or a plurality of different types of sprays are attached to the inside of the separation vessel, and the movable range movable by the cleaning liquid is the same or a plurality of types. The cleaning device is provided with two or more systems including a spray mounting seat, which is switched and used to change the cleaning range, and perform cleaning while complementing to clean the inner surface of the separation container without rotating the separation container. And safety is improved.

Since a prime mover and a switching clutch for the cleaning operation of the separation vessel are not required, the drive unit is reduced in size and weight, and the seismic resistance is improved, and parts and time required for maintenance are reduced by simplification of the structure. In addition, the exposure of maintenance personnel is reduced, and the maintainability is improved. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving the economic efficiency.

According to a fifth aspect of the present invention, there is provided a motor for separation operation installed on an upper surface of an installation slab through a bearing box, a rotating shaft attached to the motor and passing through a lower surface of the installation slab, A separation container having an attached lower end opening, a casing surrounding the separation container and attached to the lower surface of the installation slab, a pipe mounting seat provided in the casing, and a height difference between the pipe mounting seats. A fixed cleaning spray nozzle and a movable spray nozzle attached in parallel to each other and extending into the separation container, a liquid supply nozzle penetrating the casing and supplying liquid toward the inner surface of the separation container, and a liquid supply nozzle attached to the casing. An outlet nozzle and a sludge discharge nozzle are provided.

According to the fifth aspect of the present invention, a single type or a plurality of types or a plurality of types of sprays are attached inside the separation vessel, and the movable range is the same type or a plurality or different types depending on the cleaning liquid. Equipped with a cleaning device consisting of one or more spray mounting seats and a fixed spray together, it is possible to clean the inner surface of the separation container without rotating the separation container by cleaning while supplementing, and it is safe The performance is improved.

Since a prime mover and a switching clutch for the cleaning operation of the separation vessel are not required, the drive unit is reduced in size and weight to improve the quake resistance, and the simplification of the structure reduces parts and time required for maintenance. In addition, the exposure of maintenance personnel is reduced, and the maintainability is improved. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving the economic efficiency.

According to a sixth aspect of the present invention, a plurality of the fixed cleaning spray nozzles and the plurality of movable spray nozzles are respectively provided, and the cleaning liquids are selectively switched so that the cleaning liquids sprayed from the plurality of spray nozzles do not interfere with each other. It has a supply mechanism.

According to the invention corresponding to claim 6, a plurality of washing liquid systems are provided, and one kind alone or
Attached with multiple or different types of sprays, a single or multiple spray mounting seats whose movable range movable by washing water is the same or multiple, or different types,
In addition, equipped with a cleaning device consisting of a fixed spray,
By cleaning while supplementing, the inner surface of the separation container can be cleaned without rotating the separation container, and safety is improved.

Since the prime mover and the switching clutch for the cleaning operation of the separation vessel are not required, the drive unit is reduced in size and weight and the earthquake resistance is improved, and the parts and time required for maintenance are reduced by simplification of the structure. In addition, the exposure of maintenance personnel is reduced, and the maintainability is improved. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving the economic efficiency.

The invention of claim 7 is characterized in that the prime mover for separation operation is made of a radiation-resistant product. According to the invention corresponding to claim 7, by equipping the inside of the separation container with the cleaning device composed of the fixed spray, it is possible to simultaneously wash the entire inner surface of the separation container without rotating the separation container, Safety is improved.

Since a prime mover and a switching clutch for the cleaning operation of the separation vessel are not required, the drive unit is reduced in size and weight, and the seismic resistance is improved, and parts and time required for maintenance are reduced by simplification of the structure. In addition, the exposure of maintenance personnel is reduced, and the maintainability is improved. In addition, the amount of waste such as consumables and replacement parts is reduced, thereby improving the economic efficiency. Furthermore, by making the components of the drive unit radiation resistant, the amount of waste generated such as consumables and replacement parts can be further reduced.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a solid-liquid separator according to the present invention will be described with reference to FIGS. FIG. 1 shows an embodiment in which the present embodiment is applied to a solid-liquid separator for treating spent fuel solution in a nuclear fuel reprocessing plant, but the application is not limited to the above plant. Absent.

In this solid-liquid separator, a bearing box 2 is provided on the upper surface of an installation slab 1, and upper bearings 3 in the bearing box 2 are provided.
The rotating shaft 5 is supported by the lower bearing 4. Rotary axis 5
Is suspended downward through the installation slab 1, and a cylindrical separation container 7 disposed in a casing 6 is fixed to the lower end of the rotating shaft 5. The installation slab 1 can be replaced with a shielding slab installed in a reprocessing plant.

A radiation-resistant induction motor is installed on the bearing housing 2 as a separation operation motor 13, and the rotation shaft 5 is connected to the separation operation motor 13 via a flexible coupling 20.
Is connected.

As the upper bearing 3, a deep groove ball bearing that supports the thrust load of the separation vessel 7 and the rotating shaft 5 is used. The upper bearing 3 is accommodated in a bearing housing of the bearing housing 2, and transmits a thrust load to the installation slab 1 via the bearing housing 2.

On the other hand, the lower bearing 4 supporting the lower side of the rotary shaft 5 is housed in a lower bearing housing 19, and the lower bearing housing 19 is mounted on the bearing box 2 via a spring 15 and a damper 16.

A liquid supply nozzle 10 for supplying a liquid to be separated from the outside of the casing 6 and a cleaning liquid pipe 22 are provided in the separation container 7 accommodated in the casing 6 so as to extend therefrom. The liquid supply nozzle 10 enters the separation container 7 from the opening at the lower end of the separation container 7, terminates near the lower end opening plate of the separation container 7, and opens.

The cleaning liquid pipe 22 penetrates a pipe mounting seat 21 provided at a lower portion in the casing 6 and is separated from the lower opening plate by the separation vessel 7.
A plurality of fixed cleaning spray nozzles extending to the inside and spraying a cleaning liquid toward the inner wall surface of the separation vessel 10 at the tip thereof
23 is connected via a movable spray mounting seat 24.

In the casing 6, an outlet nozzle 12 for guiding a clarified liquid after the solid content is separated and removed from the liquid to be separated is provided on a lower side surface, and a sludge discharge port 26 for discharging the separated and removed solid content is provided on a bottom surface. Is provided.

When the separation operation is continued by the solid-liquid separator having the above-mentioned structure, the solid content increases on the inner surface of the separation vessel 7, and the unbalance occurs, and the unbalance force acting on the separation vessel 7 increases. When an unbalance force is generated, an excessive force is generated in the lower bearing 4 and causes damage to the solid-liquid separator. Further, when an earthquake occurs, the upper bearing 3 is vibrated like a pendulum about the rotation center, which may cause breakage of the solid-liquid separator. However, in the present embodiment, since the rotating shaft 5 is supported by the spring 15 and the damper 16 to absorb the vibration, the above cause can be prevented.

As the fixed cleaning spray nozzle 23, a spray called a flat spray having a wide cleaning range and a low pressure is used, in which the cleaning liquid is sprayed in a fan shape.
A plurality of movable spray nozzles 25 of a type called a solid spray having a narrow cleaning range and a high pressure are mounted on the movable spray mounting seat 24 in such a manner that the cleaning liquid is sprayed in a rod shape.

Next, the structure of the movable spray mounting seat 24 and the movable spray nozzle 25 will be described with reference to FIG. The movable spray mounting seat 24 has a mounting seat body rotating blade 28 for rotating the mounting seat body therein, and a movable spray nozzle.
It has a movable spray nozzle rotating blade 29 for rotating the nozzle 25, and the cleaning liquid passes through the inside of the movable spray mounting seat 24 to rotate by receiving a force on the two blades 28 and 29.
A pipe insertion part 30 for connecting the cleaning liquid pipe 22 is mounted below the movable spray mounting seat 24.

The cleaning liquid sprayed from the movable spray nozzle 25 as shown in FIG. 3 is adjusted by adjusting the rotation ratio between the mounting seat main body rotating blade 28 and the movable spray nozzle rotating blade 29 so as not to be 1: 1. Is spiral, and thus the entire inner surface of the separation container 7 can be cleaned.

As the cleaning apparatus applied in this embodiment, there are various embodiments other than the first embodiment shown in FIG. For example, multiple fixed spray nozzles
FIG. 4 shows a second embodiment in which 23 are mounted in combination. In the example of FIG. 4, a spray called a full cone type which sprays a cleaning liquid in a conical shape is applied to the fixed cleaning spray nozzle 23. As a result, the entire inner surface of the separation container 7 can be cleaned as shown in FIG.

In the third embodiment shown in FIG. 6, two washing liquid systems are provided in the separation vessel 7. That is, the movable spray mounting seat 24 and the fixed cleaning spray nozzle 23 are independently attached to the tips of the two cleaning liquid pipes 22, respectively. The fixed cleaning spray nozzle 23 is lower in height than the movable spray mounting seat 24.
Note that this relationship may be reversed.

When the solid-liquid separator has collected a certain amount of solid content, the solid-liquid separator terminates the separation operation and starts washing. In the embodiment shown in FIG. 1, the movable spray mounting seat 24 is rotated by the force of the cleaning liquid, and the high-pressure cleaning liquid sprayed from the movable spray nozzle 25 finely breaks down the solids attached to the inner surface of the separation vessel 7. .

The solids that have been cut and peeled off are washed away by the cleaning liquid sprayed from the flat spray of the fixed cleaning spray nozzle 23, and discharged out of the casing 6 from the sludge discharge nozzle 26 through the sludge discharge hole 27.

In the second embodiment shown in FIG. 4, solids can be washed out of the separation vessel 7 by the cleaning liquid sprayed from the full cone spray of the plurality of fixed cleaning spray nozzles 23.

In the third embodiment shown in FIG. 6, since a plurality of spray nozzles are used in combination with the plurality of cleaning liquid pipes 22, care must be taken so that the cleaning liquid jetted from each spray nozzle does not interfere. is there. this is,
The pressure is reduced by the cleaning fluids interfering with each other,
This is because the detergency decreases.

In order to prevent this, in the present embodiment,
First, the supply of the cleaning liquid to the cleaning liquid pipe 22 of the first series is activated, and the high-pressure cleaning liquid sprayed from the movable spray nozzle 25 attached to the movable spray mounting seat 24 causes the separation vessel 7 to be separated.
The solids adhering to the inner surface of the are finely cut. At this stage, the supply of the cleaning liquid from the first cleaning liquid pipe 22 is stopped.

Next, the supply of the cleaning liquid to the cleaning liquid supply pipe 22 of the second series is activated, and the solid content that has been cut off and has begun to peel off is separated by the cleaning liquid sprayed from the flat spray of the fixed cleaning spray nozzle 23 into the separation vessel 7. Is discharged from By separating the cleaning liquid supply systems into two lines and operating them alternately, the entire inner surface of the separation vessel 7 can be effectively used without reducing the cleaning power of each other.

[0053]

According to the present invention, since no prime mover is required for the cleaning operation, the drive unit is simple, the range requiring maintenance is reduced, and the reliability and economy are improved. In addition, the lightening of the drive unit improves the earthquake resistance. Furthermore, even if the bearing is damaged and cannot rotate due to an earthquake or the like, the solid content can be washed and discharged without relying on the rotation of the separation container, so that the safety is high.

In addition, by using a radiation-resistant induction motor as a separation operation motor, sufficient resistance is exhibited even in a radiation environment, and consumables and replacement parts are less generated. Since the number of parts requiring maintenance is reduced and the work time required for maintenance is also reduced, the radiation exposure of maintenance personnel can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a solid-liquid separator according to the present invention.

FIG. 2 is an external view showing a part of the movable spray mounting seat in FIG. 1 in a vertical section.

FIG. 3 is a schematic diagram for explaining a direction of a cleaning liquid ejected from a movable spray nozzle in FIG. 2;

FIG. 4 is an external view for explaining a second embodiment according to the present invention.

FIG. 5 is a schematic diagram showing the direction of a cleaning liquid sprayed from a plurality of fixed cleaning sprays in FIG.

FIG. 6 is a schematic diagram for explaining a second embodiment according to the present invention.

FIG. 7 is a longitudinal sectional view showing a typical example of a conventional solid-liquid separator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Installation slab, 2 ... Bearing box, 3 ... Upper bearing, 4 ... Lower bearing, 5 ... Rotating shaft, 6 ... Casing, 7 ... Separation container, 8
... Receptor, 9 ... Discharge pipe, 10 ... Supply nozzle, 11 ... Washing nozzle, 12 ... Exhaust port, 13 ... Motor for separation operation, 14 ... Motor for washing operation, 15 ... Spring, 16 ... Damper, 17 ... Switch Clutch, 18 ... Power transmission V-belt, 19 ... Lower bearing, 20 ...
Flexible coupling, 21: Piping mounting seat, 22: Cleaning liquid pipe, 23: Fixed cleaning spray nozzle, 24: Movable spray mounting seat, 25: Movable spray nozzle, 26: Sludge discharge nozzle, 27: Sludge discharge hole, 28: Mounting Rotating blade of seat body, 29: Rotating blade of movable spray nozzle, 30: Piping insertion part, 31: Piping insertion part of fixed nozzle.

Claims (7)

[Claims] 1. A motor for separation operation installed on an upper surface of an installation slab via a bearing box, a rotating shaft attached to the motor and passing through a lower surface of the installation slab, and a lower end opening attached to the rotating shaft. A separation container, a casing surrounding the separation container, and attached to a lower surface of the installation slab, a pipe attachment seat provided in the casing, and attached to the pipe attachment seat and extending into the separation container. A fixed cleaning spray nozzle, and a liquid supply nozzle that supplies liquid toward the inner surface of the separation container through the casing,
A solid-liquid separator comprising an outlet nozzle and a sludge discharge nozzle attached to the casing. 2. The solid-liquid separator according to claim 1, wherein a plurality of said fixed cleaning spray nozzles are arranged, and each of said plurality of spray nozzles has a mechanism for switchingably supplying a cleaning liquid. 3. A separating operation motor installed on an upper surface of a mounting slab via a bearing housing, a rotating shaft attached to the motor and passing through a lower surface of the mounting slab, and a lower end opening attached to the rotating shaft. A separation vessel, a casing surrounding the separation vessel and attached to the lower surface of the installation slab, and a pipe mounting seat provided in the casing,
A movable cleaning spray nozzle attached to the pipe mounting seat and extending into the separation container, a liquid supply nozzle penetrating through the casing and supplying liquid toward the inner surface of the separation container, an outlet nozzle attached to the casing, and A solid-liquid separator comprising a sludge discharge nozzle. 4. The solid-liquid separator according to claim 3, wherein a plurality of the movable cleaning spray nozzles are provided, and each of the plurality of spray nozzles has a mechanism for selectively supplying a cleaning liquid. 5. A motor for separation operation installed on an upper surface of an installation slab via a bearing housing, a rotation shaft attached to the motor and passing through a lower surface of the installation slab, and a lower end opening attached to the rotation shaft. A separation vessel, a casing surrounding the separation vessel and attached to the lower surface of the installation slab, and a pipe mounting seat provided in the casing,
A fixed cleaning spray nozzle and a movable spray nozzle which are attached to the pipe mounting seat in parallel with a difference in height and extend into the separation container, and a supply which feeds liquid through the casing toward the inner surface of the separation container. A solid-liquid separator comprising: a liquid nozzle; an outlet nozzle and a sludge discharge nozzle attached to the casing. 6. A plurality of fixed cleaning spray nozzles and a plurality of movable spray nozzles are provided, each having a mechanism for selectively supplying the cleaning liquid so that the cleaning liquid ejected from the plurality of spray nozzles does not interfere with each other. The solid-liquid separator according to claim 5, wherein: 7. The solid-liquid separator according to claim 1, wherein the separation operation motor comprises a radiation-resistant product.