JP2007224360A - Sodium dispersion production apparatus, sodium dispersion production method and sodium dispersion produced by the sodium dispersion production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sodium dispersion production apparatus capable of dispersing sodium into a dispersion medium more speedily and finely than heretofore. <P>SOLUTION: In the sodium dispersion production apparatus, a sodium dispersion part 3 is provided with a plurality of rotor/stator type stirring devices 32, and the rotor/stator type stirring device 32 is provided with a chamber in which a suction hole and an exhaust hole are formed. The plurality of rotor/stator type stirring devices 32 is configured so that a rotor and a stator are housed into the chamber, a mixture sucked from the suction hole into the chamber is stirred by the stator and the rotor, to be discharged from the exhaust hole, and the sodium dispersion part is provided with the exhaust hole of one rotor/stator type stirring device and the suction hole of another rotor/stator type stirring device to be connected to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sodium dispersion production facility, a sodium dispersion production method, and a sodium dispersion produced by the sodium dispersion production method, and more specifically, liquid metal sodium is dispersed in a dispersion medium to form a dispersion medium. The present invention relates to a sodium dispersion production facility and a sodium dispersion production method for producing a sodium dispersion in which sodium is dispersed in the form of particles, and a sodium dispersion produced by the sodium dispersion production method.

  Conventionally used for dehalogenating and decomposing organic halogen compounds such as polychlorinated biphenyls contained in electrical insulating oil, heat medium, organic waste liquid, etc., or as a synthesis reagent for organic compounds and inorganic compounds In such a case, a sodium dispersion in which metallic sodium is atomized and dispersed in a dispersion medium is used.

  As a method for producing such a sodium dispersion, generally, metallic sodium in a liquid state heated to a temperature equal to or higher than the melting point (hereinafter also simply referred to as “sodium”) and a solvent inert to metallic sodium are stirred. Many methods are used in which sodium is dispersed by high-speed stirring in a tank to make sodium fine particles. For example, Patent Document 1 below describes a method for producing a sodium dispersion by dispersing metallic sodium in trans oil.

In the production of such a sodium dispersion, a sodium dispersion part in which liquid metal sodium and a dispersion medium are stirred to disperse sodium in the dispersion medium, such as a stirring tank, and metal sodium supplied to the sodium dispersion part A sodium storage part equipped with a facility such as a sodium storage tank for storing liquid in a liquid state, a pipe for transporting liquid metallic sodium from the sodium storage part to the sodium dispersion part, a pump serving as transport power, etc. The equipment comprised by the sodium conveyance piping part with which it was equipped is used conventionally.
In this sodium dispersion part, in order to disperse the sodium particles in the dispersion medium, a stirring device (dispersion device) that normally disperses the sodium particles in the dispersion medium by mixing and dispersing the dispersion medium and sodium is used. ing.

By the way, in the sodium dispersion, it is required that the dispersed sodium is further refined, and in the sodium dispersion production facility, there is a demand for what can make the sodium more refined more quickly. Yes.
However, conventional sodium dispersion manufacturing equipment cannot sufficiently satisfy the desire to make sodium finer more quickly and finely.

JP-A-10-110205

  The present invention has been made in view of the problems as described above. Sodium dispersion production equipment capable of making sodium finer and more finely dispersed in a dispersion medium, a method for producing a sodium dispersion, and An object of the present invention is to provide a sodium dispersion produced by the method for producing a sodium dispersion.

  In order to solve the above problems, the present invention provides a sodium dispersion portion in which a mixture of metallic sodium in a liquid state and a dispersion medium is agitated so that the metallic sodium is refined and dispersed in the dispersion medium. In the dispersion manufacturing facility, a plurality of rotor / stator type stirring devices are provided in the sodium dispersion portion, and the plurality of rotor / stator type stirring devices are stirred by the rotor / stator type stirring device. And a plurality of rotor / stator type agitators, each having a suction hole for sucking a mixture of metallic sodium and a dispersion medium and a discharge hole for discharging the mixture after stirring. In the apparatus, a rotor and a stator are accommodated in a chamber, and the mixture sucked into the chamber from the suction hole is stored in the chamber. The stator and the rotor are agitated and discharged from the discharge hole, and the sodium dispersion portion includes the discharge hole of one rotor / stator type stirring device and the suction hole of another rotor / stator type stirring device. And a sodium dispersion production facility characterized by being connected to each other.

  Also, a method for producing a sodium dispersion in which metallic sodium is refined by dispersing a mixture of metallic sodium and dispersion medium in a liquid state and dispersed in the dispersion medium, and the mixture of metallic sodium and dispersion medium is inhaled A chamber having a suction hole and a discharge hole for discharging the sucked mixture; a rotor and a stator housed in the chamber; and the suction hole being sucked into the chamber A plurality of rotor / stator type stirring devices configured to stir the mixture by the stator and the rotor and discharge the mixture from the discharge hole, and using the plurality of rotor / stator type stirring devices as one rotor / stator type stirring device The agitation is carried out in a state where the discharge hole of the other rotor and the suction hole of another rotor / stator type agitator are connected. A method for producing a sodium dispersion, wherein the mixture of metallic sodium in a liquid state and a dispersion medium is continuously stirred by one rotor / stator type stirring device and another rotor / stator type stirring device. A sodium dispersion produced by the method is provided.

  In this specification, the rotor / stator type stirring device is usually a hollow cylinder and a stator in which a plurality of liquid flow paths from the inner hollow region to the outer side are formed, and the liquid is rotated to centrifuge the liquid. And a rotor formed with wings that can flow outward from the center by force, and the rotor is rotated when the wings are arranged in the hollow region of the stator. A shear portion is formed on at least one of an inner peripheral side and an outer peripheral side of the cylindrical stator to apply shear to the liquid flowing through the liquid flow path together with the stator, and the rotor blades are formed in a hollow region of the stator. And the rotor is arranged so as to be rotatable relative to the stator, so that the rotor is rotated and flows into the hollow area of the stator. And the liquid causes flow to the outside of the stator through the liquid flow path by the wings, is intended to what is configured to be able to shear at a shear portion of the rotor.

  In addition, the rotor and the stator are accommodated in the chamber, and the mixture sucked into the chamber from the suction hole is mixed and stirred by the stator and the rotor and discharged from the discharge hole. The rotor / stator type stirring device of the invention is different from what is generally called a homogenizer or the like used for stirring of the entire tank where the rotor and the stator are not directly accommodated in the chamber but immersed in the liquid tank. The stator is accommodated in the chamber having the suction hole and the discharge hole as described above, so that it can be agitated in-line in the liquid flow path by being connected to the pipe, and by rotating the rotor. It is intended to generate a liquid suction force from the suction hole and a liquid discharge force from the discharge hole. .

According to the present invention, in the sodium dispersion part of the sodium dispersion production facility, the rotor and the stator are accommodated in the chamber, and the mixture sucked into the chamber from the suction hole is mixed and stirred by the stator and the rotor. There are provided a plurality of rotor / stator type stirring devices configured to be discharged from the discharge holes, and one rotor / stator type stirring device among the plurality of rotor / stator type stirring devices, Since the suction hole of the other rotor / stator type stirring device is connected to the sodium dispersion part, the mixture of the liquid sodium metal and the dispersion medium stirred by one rotor / stator type stirring device is used. It can be again introduced into another rotor / stator type stirring device and continuously stirred.
Therefore, compared with the case where a single rotor / stator type stirring device is used, metallic sodium can be rapidly refined and dispersed in the dispersion medium.

In addition, the rotor and the stator are accommodated in the chamber, and the mixture sucked into the chamber from the suction hole is mixed and stirred by the stator and the rotor and discharged from the discharge hole. The rotor / stator type agitator must be equipped with rotors and stators of different shapes, or even if the same rotor / stator type agitator is used, the operating conditions of each may be different. Can do.
Therefore, the operating conditions of the rotor / stator type agitator on the front side of the rotor / stator type agitator and the rotor / stator type agitator on the rear side are adjusted to adjust the rotor / stator type agitator on the front side and the rear side of the rotor / stator type agitator. The connecting part between the rotor / stator type stirrer is brought to a positive pressure state, back pressure is applied to the rotor / stator type stirrer on the rear stage, and a high shear stress is applied to the mixture of metallic sodium and dispersion medium to stir. Or a mixture of metal sodium and dispersion medium sucked into the rotor / stator type agitator at the rear stage with the connecting portion in a negative pressure state, and a rotor / stator type agitator at the rear stage of the mixture of metal sodium and dispersion medium. The time for passing through the device is increased compared to the case of using a single rotor / stator type stirring device, and the rotor and stator Or it can increase the shear number given by the.
That is, metallic sodium can be dispersed in the dispersion medium more quickly and more finely than conventional sodium dispersion manufacturing equipment.

(First embodiment)
In the sodium dispersion manufacturing facility of this embodiment, a dispersion medium and metallic sodium are used. This dispersion medium has a density of 0.85 to 0.87 g / cm ³ , a flash point of 140 ° C. or more, a pour point of −20 ° C. or less, a kinematic viscosity at 40 ° C. of 7 to 9 mm / s, and an acid value of 0.01 mgKOH / g or less. It is made of paraffinic mineral oil with sulfur content of 1ppm or less, paraffin chain carbon content of 50% or more, and aromatic ring carbon content of 15% or less. Can be used.

Hereinafter, FIG. 1 shows a sodium dispersion manufacturing facility in the case where an electric insulating oil (hereinafter also referred to as “insulating oil”) using the above-described paraffinic mineral oil is used as the dispersion medium. This will be described with reference to FIG.
The sodium dispersion production facility of the present embodiment includes a sodium dispersion unit 3 in which metallic sodium in a liquid state is stirred together with a dispersion medium in order to form a sodium dispersion in which sodium is dispersed in the dispersion medium. A sodium reservoir 1 having a sodium reservoir 11 in which metal sodium is stored in a liquid state so as to supply metal sodium in a liquid state to the sodium dispersion portion 3, and a liquid state from the sodium reservoir 1 to the sodium dispersion portion 3 A sodium transport pipe portion L1 having a pipe for transporting metallic sodium is provided.
In addition, the sodium dispersion manufacturing facility of the present embodiment has an insulating oil storage section (dispersion medium storage section) having an insulating oil storage tank (dispersion medium storage tank) 21 that stores an insulating oil serving as a dispersion medium for the sodium dispersion. 2 and the sodium dispersion storage part 4 which stores the sodium dispersion formed by the sodium dispersion part 3 is provided.

  In the present embodiment, the sodium reservoir 1, the insulating oil reservoir 2, the sodium dispersion portion 3, and the sodium dispersion reservoir 4 are respectively installed in separate buildings, and the sodium reservoir 1 and the sodium dispersion portion 3 A sodium transport pipe section L1 is provided between them, and an insulating oil transport pipe section (dispersion medium transport pipe section) L2 is provided between the insulating oil storage section 2 and the sodium dispersion section 3, and the sodium dispersion section 3 and the sodium dispersion body. A sodium dispersion transport pipe L3 is provided between the reservoir 4 and the reservoir 4.

The sodium reservoir 1 is provided with a sodium reservoir 11 having a capacity of, for example, several tens of m ^{3 in} order to store metallic sodium in a liquid state.
Further, the sodium reservoir 1 has a pressurized nitrogen supply device 12 as a pressurizing mechanism for pressurizing liquid metallic sodium stored in the sodium reservoir 11 and the sodium reservoir from the pressurized nitrogen supply device. The tank 11 is provided with a nitrogen supply pipe for conveying pressurized nitrogen.

  As the pressurized nitrogen supply device 12 of the pressurizing mechanism, for example, a nitrogen generating device that generates pressurized nitrogen gas, a nitrogen tank that stores nitrogen generated by the nitrogen generating device in a pressurized state, and the like Can be configured. Further, if necessary, a backup of the nitrogen generator can be performed by using a nitrogen gas cylinder connected to the nitrogen supply pipe in addition to the nitrogen generator. In addition, the nitrogen gas generation device uses, for example, a so-called Pressure Swing Adsorption (hereinafter also referred to as PSA) method by using an adsorbent that adsorbs a substance to be separated in a high pressure state and releases it in a low pressure state. What was comprised so that the gas contained other than nitrogen could be made to adsorb | suck to an adsorbent and the highly purified nitrogen could be taken out can be used. As this PSA type nitrogen generator, two or more adsorption towers are provided, one adsorption tower is placed in a high pressure state, a gas other than nitrogen is adsorbed on the adsorbent, and the high pressure state nitrogen is discharged from this adsorption tower. It is preferable that the adsorption tower is kept in a low pressure state and oxygen or the like adsorbed on the adsorbent is discharged so that nitrogen in a pressurized state can be continuously taken out. Moreover, as a PSA type | system | group nitrogen generator, what can make the pressure of the discharge | emission (stored in a nitrogen tank) the pressure of several hundred kPa can be used, for example.

  Furthermore, this pressurization mechanism is provided with a mechanism for controlling the supply of pressurized nitrogen to the sodium reservoir by the amount of sodium supplied from the sodium reservoir 11 to the sodium dispersion part 3, for example, PID control For example, a flow rate adjusting valve that adjusts the flow rate of pressurized nitrogen to the sodium reservoir 11 is used.

The said sodium storage tank 11 is formed so that a tank main body is comprised by the cover part and the main-body part, and can hold the content in the state which maintained the pressure state of the content.
The lid portion is opened with a sodium inlet for introducing metal sodium carried in a tank lorry into the sodium reservoir and a nitrogen inlet for introducing pressurized nitrogen from the pressurized nitrogen supply device. The sodium inlet is in communication with a tank truck or the like through a pipe, and the nitrogen inlet is in communication with the pressurized nitrogen supply device 12 through the pipe.
Further, the wall of the main body portion is formed in a double shape to form a jacket structure, and this jacket structure portion is used to maintain the liquid state by heating the metallic sodium stored in the sodium storage tank 11 to 120 ° C., for example. It is formed so that a heat medium such as oil can be circulated.
Furthermore, one end of the pipe of the sodium transport pipe is opened near the bottom of the main body.

The pipe of the sodium transport pipe L1 is arranged from the building where the sodium reservoir 1 is arranged to the building where the sodium dispersion part 3 is arranged, and metallic sodium is supplied from the sodium reservoir 11 to the sodium dispersion part 3. It is insulated by a heat insulating material so as to be conveyed while being maintained in a liquid state.
The sodium transport piping part L1 is provided with a flow rate measuring device (not shown) for measuring the flow rate of sodium flowing through the pipe used for transporting the sodium. No conveying power such as a pump for conveying is provided.
As a result, the formation of the joining portion in the sodium transport piping portion L1 can be suppressed, the leakage of sodium can be suppressed, and the labor required for equipment maintenance can be reduced.

The insulating oil reservoir 2 is provided with an insulating oil reservoir 21 having a capacity of, for example, several tens of m ^{3 in} order to store the insulating oil.
In this insulating oil storage tank 21, one end of the pipe of the insulating oil transport pipe L2 is opened.

The piping of the insulating oil transfer piping part L2 whose one end is opened in the insulating oil storage tank 21 is arranged from the building where the insulating oil storage part 2 is arranged to the building where the sodium dispersion part 3 is arranged. .
In addition, the insulating oil transfer piping section L2 has a flow rate measuring device (not shown) for measuring the flow rate of the insulating oil flowing through the pipe used for transferring the insulating oil, and an insulating oil transfer pump for transferring the insulating oil ( Dispersion medium transport pump) P1 and a heat exchanger EX for heating the insulating oil are provided.

  The sodium dispersion part 3 includes a primary dispersion device in which sodium is primarily dispersed to an average particle size of, for example, about 20 μm, and a sodium primary dispersion dispersed in the primary dispersion device having an average sodium particle size of about 5 μm. A plurality of secondary dispersion devices for further dispersing so as to be a sodium secondary dispersion are provided. And the other end part of the said sodium conveyance piping part L1 and the other end part of the said insulating oil conveyance piping part L2 are connected so that metal sodium and insulating oil can be supplied to the said primary dispersion apparatus 31. .

The sodium dispersion part 3 stores the sodium primary dispersion dispersed in the primary dispersion device 31 or repeatedly passes the sodium primary dispersion through the secondary dispersion device 32 to obtain the sodium secondary dispersion. A plurality of buffer tanks 33 having a capacity of, for example, about 2 to ³ m ³ are provided for storing the sodium dispersion once passed through the secondary dispersion device.

Further, the sodium dispersion part 3 is provided with a sodium dispersion cooling tank 34 for cooling the sodium secondary dispersion formed in the secondary dispersion device 32 so that the average particle diameter of sodium is about 5 μm below the melting point of sodium. The sodium dispersion cooling tank 34 has a capacity of about 10 m ^{3, and the} tank wall is doubled to form a jacket structure. And it forms so that refrigerant | coolants, such as oil, can distribute | circulate to this jacket structure part.
Further, the sodium dispersion cooling tank 34 is provided with a stirring mechanism so as to suppress the precipitation of sodium while making the temperature in the tank uniform.

As the primary dispersion device 31, for example, a stirring device including a paddle blade, a disk turbine blade, or the like can be used.
The stirrer also maintains an appropriate temperature of the sodium dispersion during primary dispersion, for example, an oil to prevent the temperature of the sodium dispersion from rising too high and exceeding the flash point of the insulating oil. It is preferable to use a stirring tank in which a jacket structure capable of circulating a heat medium such as is formed. In particular, a synthetic heat transfer oil that is inactive to sodium can be suitably used as the oil in that sodium can be prevented from reacting even when sodium leaks into the jacket portion.
In addition, the jacket structure and the synthetic heat medium oil to be used are preferably selected from those capable of maintaining the dispersion medium and metal sodium contained in the primary dispersion device 31 at a temperature of 105 to 140 ° C.

  Further, as the secondary dispersion device 32, two rotor / stator type stirring devices are provided. In addition, the two rotor / stator type stirrers each have a suction hole through which the rotor and the stator suck a mixture of metallic sodium and dispersion medium before stirring, and a mixture of metallic sodium and dispersion medium after stirring. It is accommodated in a chamber in which a discharge hole for discharging is formed. The mixture sucked into the chamber from the suction hole is mixed and stirred by the stator and the rotor and discharged from the discharge hole.

The two rotor / stator type stirring devices are arranged in series on the upstream side and the downstream side in the flow direction of the mixture of metallic sodium and the dispersion medium, and are discharged from the rotor / stator type stirring device on the upstream side. The hole and the suction hole of the rotor / stator type stirring device on the downstream side are connected.
The rotor / stator type stirrer disposed on the upstream side of the connected rotor / stator type stirrer, that is, the upstream side in the flow direction of the mixture of the metallic sodium and the dispersion medium is a high discharge type rotor / stator type. A stirrer (hereinafter also referred to as “high discharge type secondary dispersion device”) is used, and a downstream of the downstream side is a high shear type rotor / stator type stirrer (hereinafter referred to as “high shear type secondary dispersion device”). Is used).

  As this high discharge type secondary dispersion device 32A, for example, as shown in FIG. 2 and FIG. 3, a plurality of blades are erected while providing a gap as a liquid flow path in the circumferential direction to form an overall hollow cylindrical shape. A stator in which a plurality of concentric circular blades are formed and a rotor having blades (shear portions) formed in a plurality of concentric circles in the same manner as this stator mesh with each other and face each other. Can be used.

The rotor is formed with a plurality of concentric blades (shearing portions) formed on the front surface side of the disk-shaped main body, and a rotating shaft for rotating the rotor is fixed to the central portion on the back surface side. Yes.
Further, the rotor has a receding wing (blade part) formed at the center thereof, and when the stator and the blades are meshed with each other and arranged to face each other, the concentric circle is positioned so that the receding wing is located in the hollow area of the stator Shaped blades and swept wings.

The rotating blades of the rotor cause a centrifugal force to act on the sodium primary dispersion by rotation, and the sodium primary dispersion that has received the centrifugal force flows to the outer peripheral side of the stator through the liquid flow path of the stator.
At this time, the primary sodium dispersion passing through the liquid flow path is sheared by a large number of blades disposed on the outer peripheral side of the swept blade and the blades of the stator.
The rotor is housed in a chamber in which a cylindrical space having a diameter slightly larger than that of the disk-shaped main body and slightly thicker than the rotor is formed. The chamber that accommodates the rotor has an opening surface formed in one of the cylindrical spaces and a closed surface formed in the other, and the closed surface has a through-hole through which the rotating shaft is inserted at the center. The opening surface has a flange formed on the outer periphery of the opening. In addition, a discharge hole is formed on the side surface of the chamber for communicating the inside of the chamber with the outside so that the sodium dispersion dispersed in the chamber can be discharged to the outside of the chamber.
And this rotor is accommodated in the chamber, with the back side of the disc-shaped main body abutting against the closed surface.
The rotor is housed in such a chamber and is rotatable relative to the chamber, and is rotatable in the chamber by the rotation shaft.

In the stator, a plurality of blades as described above are arranged on one side of a plate-like body formed on the outer edge of a flange formed on the outer edge of the rotor. It is erected while providing a gap as a liquid flow path in the direction.
When the flanges of the stator and the rotor are in contact with each other, the rotor protrudes more toward the rotor than the flange contact surface, and is positioned between the concentrically arranged blades on the rotor surface to form a mesh. Concentric blades are arranged so that the rotor retreat wings are located in the hollow region of the rotor to form a cylindrical shape of the stator.

In this stator, a through-hole (suction hole) penetrating from the front side to the back side in which a concentric blade is formed in the center of the stator so that a sodium dispersion primarily dispersed in the hollow region can be introduced. ) Is formed.
Accordingly, the flanges of the stator and the rotor are brought into contact with each other and locked together, whereby the chamber is closed except that the suction hole and the discharge hole form a communication state with the outside. Become.
Further, the flanges of the stator and the rotor are brought into contact with each other and locked to each other, so that the rotor is disposed so as to be relatively rotatable with respect to the stator in the closed chamber. The liquid suction force and the liquid discharge force from the discharge hole can be generated.
Further, this high discharge type secondary dispersion device 32A is configured as described above, and can be agitated in-line by connecting piping to the suction hole and the discharge hole.

As such a high discharge type rotor / stator type stirring device, usually when used alone, a mixture of metallic sodium and insulating oil in a liquid state has an average sodium particle size of 10 μm within 10 hours. The maximum discharge rate of 15 m ³ / h or more can be used, and a mixture of metallic sodium and insulating oil in a liquid state can have an average particle diameter of sodium within 10 hours. It is preferable that the thickness be 5 μm or less and the maximum discharge amount is 18 m ³ / h or more.

In the high shear type secondary dispersion device 32B, for example, the blade area of the swept wing formed in the central portion of the rotor is reduced or not provided, and the blades are formed in a plurality of concentric circles of the rotor. The number of blades arranged concentrically, or the number of rows is increased, while increasing the number of rows or the number of rows. Those having improved shear performance can be used.
As such a high shear type secondary dispersion device, any rotor / stator type stirring device having a shearing force higher than that of a high discharge type rotor / stator type stirring device may be used. In the present specification, it is intended that the average particle diameter of metallic sodium is further refined when a mixture of metallic sodium and insulating oil in a liquid state is passed at the same flow rate. Yes.

Whether the rotor / stator type agitator used in this high shear type secondary dispersion device has a higher shearing force than the high discharge type rotor / stator type agitator is in the same state and insulated from the same amount of metallic sodium. Two mixtures with oil are prepared, and each is separately the same for the rotor / stator type stirring device used for the high shear type secondary dispersion device and the rotor / stator type stirring device used for the high discharge type secondary dispersion device. It can be determined by circulating at a flow rate and comparing which mixture sodium particles first have a predetermined average particle diameter.
At this time, for example, the rotor / stator type stirring device used in the high discharge type secondary dispersion device is operated at a substantially maximum rotation speed, and the flow rate on the high shear type secondary dispersion device side is changed to the high discharge type secondary dispersion device. In order to match the above, the rotor / stator type stirring device used in the high shear type secondary dispersion device may be energized using, for example, a vortex pump that does not significantly affect the shearing of sodium, and the above determination may be made. .

  In these secondary dispersion devices, a jacket structure is formed outside the device as in the case of the primary dispersion device described above.

  In this sodium dispersion part 3, one end of the pipe is connected to the sodium dispersion cooling tank 34 in order to supply the formed sodium dispersion to the sodium dispersion storage part 4 through the pipe of the sodium dispersion transport pipe part L3. It is connected.

The sodium dispersion reservoir 4 is provided with a plurality of sodium dispersion reservoirs 41 having a capacity of, for example, several tens of m ³ , and the sodium dispersion reservoir 41 is provided with the sodium dispersion reservoir 41. The other end of the pipe is connected.
Further, a discharge pipe for discharging the sodium dispersion is connected to the sodium dispersion storage tank 41, and supply to a tank truck or the like can be appropriately performed through the discharge pipe.
In addition, the sodium dispersion storage tank 41 is also provided with a stirring mechanism in order to suppress sodium sedimentation.

  Although not described in detail here, the sodium dispersion facility of this embodiment includes a general sodium dispersion facility such as an electric heater, a temperature control device such as steam, a mechanism for controlling the flow of valves, valves, and the like. The apparatus and mechanism used for the body manufacturing facility can be employed as long as the effects of the present invention are not impaired.

Next, a sodium dispersion manufacturing method using such a sodium dispersion manufacturing facility will be described.
First, the metallic sodium stored in the sodium storage tank 11 of the sodium storage section 1 is heated to a temperature of 120 ° C., for example, by circulating a heat medium through the jacket section of the sodium storage tank 11, and sufficient to maintain the temperature. A liquid state having fluidity is set, the sodium storage tank 11 is sealed, and pressurized nitrogen is supplied to the sodium storage tank 11 from the pressurized nitrogen supply device 12 of the pressurizing mechanism. Pressurize metallic sodium.

By pressurizing the sodium metal with the pressurized nitrogen, the sodium metal in the sodium storage tank is pumped to the primary dispersion device 31 through the sodium transport pipe portion L1.
At this time, depending on the pipe length of the sodium transport pipe L1, the pipe diameter, the height difference between the start point and the end point, etc., for example, pressurized nitrogen is supplied to the sodium storage tank, and the pressure of nitrogen in the sodium storage tank 50 to 100 kPa (for example, 70 kPa) or the like, for example, sodium can be pumped to a point at a distance of several tens of meters or more through the sodium transport piping portion L1 using 2B piping.

  On the other hand, from the insulating oil reservoir 2, the insulating oil is supplied to the primary dispersion device 31 through the piping of the insulating oil transfer piping L2 by the transfer power of the insulating oil transfer pump P1. At this time, the insulating oil is heated to, for example, a temperature of 120 ° C. and supplied to the primary dispersion device 31 by the heat exchanger EX provided in the insulating oil transfer piping section L2.

In the primary dispersion device 31, the introduced insulating oil and metallic sodium are mixed and stirred to form a sodium primary dispersion having an average particle diameter of sodium of 20 μm or less. At this time, frictional heat is normally generated in the insulating oil and metallic sodium, and the temperature rises. Therefore, the heating medium such as oil is jacketed using the stirring tank in which the jacket structure as described above is formed. It is preferable to form a sodium primary dispersion while maintaining the temperature at 120 ° C., for example.
In this specification, the particle diameter of sodium is intended to mean the diameter of a perfect circle having the same area as the projected area of sodium particles measured using an optical microscope or the like, unless otherwise specified. Unless otherwise specified, the average particle diameter of sodium is a particle obtained by obtaining the particle diameter of particles that are visually observable when the sodium dispersion is magnified 200 times and observed. Intended to be the arithmetic average of the diameters.

Subsequently, the sodium primary dispersion obtained in the primary dispersion device 31 is temporarily stored in the buffer tank 33, and the sodium primary dispersion is supplied from the buffer tank 33 to the high discharge type secondary dispersion apparatus 32A to further refine the sodium. Then, sodium is further refined and dispersed by the high shear type secondary dispersion device 32B arranged in the next stage of the high discharge type secondary dispersion device 32A.
More specifically, the sodium primary dispersion was sucked from the buffer tank 33 through the suction hole of the high discharge type secondary dispersion device 32A, and the rotor was rotated so that the sodium primary dispersion was sucked from the suction hole into the stator hollow region in the chamber. The sodium dispersion is sheared by the blades of the rotor and the stator while centrifugal force is applied by the retreating blade provided in the central portion of the rotor to move it outward through the liquid flow path of the stator. Then, the sodium dispersion is discharged from the discharge hole and introduced into the chamber of the high shear type secondary dispersion device 32B through the suction hole of the high shear type secondary dispersion device 32B to further refine the sodium particles. Next, the sodium dispersion discharged from the high shear type secondary dispersion device 32 </ b> B is refluxed to the buffer tank 33.

As described above, by using the high discharge type secondary dispersion device 32A and the high shear type secondary dispersion device 32B in combination, the sodium particles can be efficiently refined and the sodium dispersion such as a pump can be conveyed. It is possible to obtain an effect that the equipment can be omitted.
In addition, by using a plurality of secondary dispersion devices (rotor / stator type stirring devices) having different shearing force and discharge force, the sodium particles of the sodium dispersion can be made finer more quickly and finely.

  Furthermore, a high discharge type secondary dispersion device is arranged on the front side of the connecting part, and a high shear type secondary dispersion device is arranged on the rear side, and a rotor / stator type stirring device having a larger discharge amount than the rear side is arranged on the front side. By implementing secondary dispersion of the sodium dispersion, it is possible not only to eliminate equipment for transporting the sodium dispersion, but also to connect the connecting portion with the high-discharge type secondary dispersion device on the front stage side. It is possible to carry out stirring (secondary dispersion) in a state in which a back pressure is applied in a high-shear type secondary dispersion device on the rear stage side in a pressure state. Therefore, it is possible to use a high-shear type secondary dispersion device on the rear stage side, which has improved shearing performance, with the gap between the rotor and stator blades being narrowed. From such a thing, manufacture of the more refined sodium dispersion can be implemented more rapidly. Moreover, even when the temperature of the dispersion medium of the sodium dispersion is increased in this secondary dispersion, the linking component is made positive pressure, whereby volatile components are volatilized from the dispersion medium and bubbles are generated. There is also an effect of suppressing the bubbles from being involved in the secondary dispersion device and reducing the shear performance (dispersion performance).

As a dispersion medium, a density of 0.85 to 0.87 g / cm ³ , a flash point of 140 ° C. or more, a pour point of −20 ° C. or less, a kinematic viscosity at 40 ° C. of 7 to 9 mm / s, an acid value of 0.01 mgKOH / g or less, sulfur It consists of paraffinic mineral oils with a content of 1 ppm or less, a paraffin chain carbon content of 50% or more, and an aromatic ring carbon content of 15% or less. In such a case, it is preferable to carry out secondary dispersion by setting the connecting portion to a positive pressure state of 100 Pa or more in that the above effects can be sufficiently obtained.

  In this way, the sodium dispersion is removed from the buffer tank 33 until the sodium particles of the sodium dispersion have a desired particle size, for example, a particle size of 5 μm or less, and the high shear type secondary dispersion device 32A and the high discharge type secondary dispersion device. Reflux to buffer tank 33 via 32B.

When the sodium particles have a desired particle size, the sodium dispersion flow path from the high discharge type secondary dispersion device 32B to the buffer tank 33 is switched to the sodium dispersion cooling tank 34, and the sodium dispersion Is stored in the sodium dispersion cooling tank 34.
At this time, a pressurized gas such as nitrogen may be introduced into the buffer tank 33 so that the sodium dispersion in which the sodium particles have a desired particle diameter is pumped to the sodium dispersion cooling tank 34. In this way, by introducing a pressurized gas such as nitrogen into the buffer tank 33 and feeding the sodium dispersion to the sodium dispersion cooling tank 34, sodium can be quickly obtained as compared with the case where the secondary dispersion apparatus is made to flow by the discharge force. While being able to move a dispersion to the sodium dispersion cooling tank 34, it can suppress that the sodium dispersion used as the desired particle diameter remains in a system, and it can be set as a more efficient operation method.
At this time, a coolant is circulated through the jacket of the sodium dispersion cooling tank 34 to cool the sodium dispersion to about 25 ° C., for example.

  The sodium dispersion cooled in the sodium dispersion cooling tank 34 is stored in the sodium dispersion storage tank 41 of the sodium dispersion storage section 4 through the pipe of the sodium dispersion transport pipe section L3.

In the present embodiment, the case where the sodium dispersion is manufactured as described above is described by using the sodium dispersion manufacturing facility configured as described above, but in the present invention, the sodium dispersion manufacturing facility is described above. It is not limited to such a thing.
Further, in the present embodiment, when the metal sodium in the sodium storage tank is pumped to the primary dispersion device through the sodium transport pipe section, the pressure fluctuation in the sodium storage tank can be moderated, and the flow rate can be reduced. Although the case where pressurized gas is supplied into the sodium reservoir tank to pressurize the metal sodium has been described as an example in terms of easy adjustment and the like, in the present invention, means for pressurizing the metal sodium in the sodium reservoir tank is provided. It is not limited to supply of pressurized gas.

Furthermore, in this embodiment, it is inert with respect to sodium, is safe, has no risk of lowering the quality of the sodium dispersion, and is inexpensive, so that nitrogen is used as a pressurized gas in the sodium reservoir. However, in the present invention, the pressurized gas is not limited to nitrogen.
In the present embodiment, the insulating oil is described as an example of the dispersion medium of the sodium dispersion. However, in the present invention, the dispersion medium is not limited to the insulating oil.

  Moreover, in this embodiment, from the sodium storage part to a sodium dispersion | distribution part in the point which can suppress the increase in the connection part of the sodium conveyance piping part by installation of a pump, can suppress the leakage of sodium, and can reduce a maintenance effort. In the sodium dispersion manufacturing facility of the present invention, the sodium dispersion tank is provided with a pressurizing mechanism for transporting sodium in the liquid state, and sodium is pumped through the sodium transport piping. The tank is not limited to the one provided with the pressurizing mechanism.

  Further, in this embodiment, the rotor / stator type stirring device has been described as an example provided with a circumferential blade in which a plurality of blades are erected while providing a gap in the circumferential direction between the stator and the rotor. In the present invention, instead of such a circumferential blade, for example, a cylindrical body in which a large number of through holes such as slits and round holes are formed on the side surface can be used. Further, the number of rows of these circumferential blades arranged concentrically on the stator and the rotor can be changed as appropriate. Further, in the rotor, instead of forming the shearing portion with such a circumferential blade, for example, the outer end portion of the central backward blade is extended to the vicinity of the inner periphery of the circumferential blade of the stator, and the backward blade is provided. It is also possible to make the outer end portion of each function as a shearing portion.

  Further, in the present embodiment, the rotor blade portion has been described by taking the swept blade as an example, but in the present invention, centrifugal force is applied to the mixture of sodium and the dispersion medium, and the outer side of the stator is passed through the stator liquid flow path. The configuration is not limited to the swept-back wing as long as it is configured to flow.

(Second embodiment)
In the present embodiment, the primary dispersion device 31 is not used, and liquid sodium supplied from the sodium reservoir and insulating oil supplied from the insulating oil reservoir 21 are directly introduced into the buffer tank 33. The first embodiment is the same as the first embodiment except that it is configured to be stored.
Further, in the buffer tank 33 of the second embodiment, if necessary, stirring means for mixing and stirring the dispersion medium and sodium to such an extent that the ratio of the dispersion medium and sodium supplied to the secondary dispersion apparatus is not biased. Can also be provided.

  Also in the second embodiment, as in the first embodiment, the secondary dispersion device 32 is circulated from the buffer tank 33 until the sodium particle diameter reaches a desired value, and is refluxed again to the buffer tank 33 to obtain sodium particles. What is necessary is just to make it introduce | transduce into the sodium dispersion cooling tank 34, when a diameter becomes a desired value.

  Also in this second embodiment, it is possible to employ various changes relating to the configuration and operation method of each facility described in the first embodiment.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.

Example 1
Adjustment of the primary dispersion:
Dispersion medium: Paraffinic mineral having a density of 0.86 g / cm ³ , a flash point of 140 ° C. or more, a pour point of −20 ° C. or less, a kinematic viscosity at 40 ° C. of 8 mm / s, an acid value of 0.01 mgKOH / g or less, and a sulfur content of 1 ppm or less. A primary dispersion having an average particle size of sodium of about 20 μm was prepared using 14880 kg of electrical insulating oil made of oil and 5120 kg of sodium.

Secondary dispersion equipment (rotor / stator type stirring device):
High discharge type secondary dispersion device:
Product name “Cabitron” manufactured by Taiheiyo Kiko Co., Ltd. (maximum discharge rate by individual operation: approx. 25 m ³ / h)
High shear type secondary dispersion device:
Product name “X-Series” manufactured by ROSS (maximum discharge rate of 1 m ³ / h or less by independent operation)

Constitution:
The discharge hole of the high discharge type secondary dispersion device and the suction hole of the high shear type secondary dispersion device are connected by a double pipe having an inner tube of 80 mm and an outer tube of 100 mm. The dispersion apparatus was configured such that the sodium dispersion discharged from the discharge hole was returned to the high discharge type secondary dispersion apparatus.

Rating:
The high dispersion type secondary dispersion device was operated at 4800 rpm and the high shear type secondary dispersion device was operated at 5800 rpm while maintaining the sodium dispersion supply temperature to the secondary dispersion device at 120 to 140 ° C.
At this time, the flow rate of the sodium dispersion was 15000 kg / h.
At this time, a positive pressure of 500 Pa was generated in the sodium dispersion at the connecting portion between the high discharge type secondary dispersion device and the high shear type secondary dispersion device.
The sodium dispersion is circulated between the high discharge type secondary dispersion apparatus and the high shear type secondary dispersion apparatus. After 80 minutes, the sodium dispersion is cooled and the average particle of the sodium particles dispersed in the sodium dispersion is dispersed. The diameter was measured.
In the measurement of the average particle diameter of the sodium particles, first, when a range of 0.29 mm in length × 0.38 mm in width selected at random from the sodium dispersion was magnified 200 times using an optical microscope, it was observed. The projected area was measured for all particles visually visible. Find the volume of the true sphere that has the same projected area as the measured projected area, find the average volume by dividing the sum of the true sphere equivalent volume of all particles by the number of particles, and obtain the true sphere that has the same volume as this average volume. Was determined as an average volume particle diameter.
Further, the diameter of a perfect circle having the same area as the projected area of the particles was obtained by calculation, and the obtained diameter was divided by the number of particles to obtain a number average particle diameter.

  As described above, the average volume particle size of the sodium particles of the obtained sodium dispersion was 4.5 μm, the number average particle size was 3.27 μm, the number of samples was 3111, and the standard deviation was 1.25 μm.

(Example 2)
Sodium dispersions as in Example 1 except that two high-discharge secondary dispersion devices used in Example 1 were arranged in series, operated at 4800 rpm upstream, 5800 rpm downstream, and operated for 300 minutes. Was made.
The obtained sodium particles had an average volume particle size of 5.14 μm, a number average particle size of 3.83 μm, and a standard deviation of 1.40 μm.

(Comparative Example 1)
A sodium dispersion was prepared under the same conditions as in Example 1 except that only one high-discharge type secondary dispersion device used in Example 1 was used and the rotational speed was 4800 rpm. The sodium particles of the obtained sodium dispersion had an average volume particle diameter of 5 μm, a number average particle diameter of 3.73 μm, and a standard deviation of 1.35 μm.

  From the above, the discharge hole of one rotor / stator type stirring device and the suction hole of the other rotor / stator type stirring device are connected to each other so that a plurality of rotor / stator type stirring devices are provided in the sodium dispersion portion. Thus, it can be seen that metal sodium can be rapidly refined and dispersed in the dispersion medium as compared with the case where a single rotor / stator type stirring device is used.

The flowchart which shows the sodium dispersion manufacturing equipment of 1st embodiment. The fragmentary sectional view which shows a rotor / stator type | mold stirring apparatus. The front view which shows the stator and rotor of the rotor / stator type stirring apparatus of FIG. The flowchart which shows the sodium dispersion manufacturing equipment of 2nd embodiment.

Explanation of symbols

  1: sodium reservoir, 2: insulating oil reservoir, 3: sodium dispersion, 11: sodium reservoir, 12: pressurized nitrogen supply device (pressurization mechanism), 32: secondary dispersion device (rotor / stator type stirring) Equipment), L1: Sodium transport piping

Claims (6)

A sodium dispersion production facility provided with a sodium dispersion portion in which a mixture of a metallic sodium in a liquid state and a dispersion medium is agitated so that the metallic sodium is refined and dispersed in the dispersion medium,
The sodium dispersion portion is provided with a plurality of rotor / stator type stirring devices, and the plurality of rotor / stator type stirring devices include metal sodium and a dispersion medium stirred by the rotor / stator type stirring device. A chamber formed with a suction hole through which the mixture is sucked and a discharge hole through which the mixture after stirring is discharged; and the plurality of rotor / stator type stirring devices include a rotor in the chamber. A stator is accommodated, and the mixture sucked into the chamber from the suction hole is agitated by the stator and the rotor and discharged from the discharge hole. The discharge hole of the mold agitator is connected to the suction hole of the other rotor / stator agitator. Sodium dispersion production facility, characterized in that is provided.   The rotor / stator type agitator on the front side of the connected rotor / stator type agitator is larger than the latter rotor / stator type agitator connected to the front rotor / stator type agitator. The sodium dispersion manufacturing equipment according to claim 1, which has a discharge amount.   The rotor / stator type stirring device on the rear side of the connected rotor / stator type stirring device is higher than the rotor / stator type stirring device connected to the front side of the latter rotor / stator type stirring device. The sodium dispersion manufacturing equipment according to claim 1 or 2, wherein the facility has a shearing force. A method for producing a sodium dispersion in which metallic sodium is refined by stirring a mixture of metallic sodium and a dispersion medium in a liquid state and dispersed in the dispersion medium,
A chamber in which a suction hole for sucking a mixture of sodium metal and a dispersion medium and a discharge hole for discharging the sucked mixture are formed, and a rotor and a stator housed in the chamber; Using a plurality of rotor / stator type stirrers configured to stir the mixture sucked into the chamber from the suction hole by the stator and the rotor and to discharge the mixture from the discharge hole. The stirring is carried out in a state where the discharge hole of one rotor / stator type stirring device is connected to the suction hole of another rotor / stator type stirring device, and the liquid sodium metal and the dispersion medium are mixed. The mixture is continuously stirred by one rotor / stator type stirring device and another rotor / stator type stirring device. Sodium dispersion manufacturing method according to symptoms.   5. The method for producing a sodium dispersion according to claim 4, wherein the agitation is performed by bringing a connecting portion between a discharge hole of one rotor / stator type agitator and a suction hole of another rotor / stator type agitator to a positive pressure state.   A sodium dispersion produced by the method for producing a sodium dispersion according to claim 4 or 5.

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