JP2022080043A - Support system and support method - Google Patents

Abstract

To provide a system and a method which support determination of an installation position where an auxiliary stirrer is added thereto, in a gas/liquid mixing device that is used for mixing liquid with a gas.SOLUTION: A support system according to the present invention, which is configured to support determination of an installation position for an auxiliary stirrer that is added to a stirrer, in a gas/liquid mixing device that has a stirring tank, the stirrer, a baffle plate and a gas supply pipe, comprises: an obtaining part that obtains first information concerning a shape of the stirring tank, second information concerning a kind and a shape of the stirrer, and reference information which includes at least a kind and a supply amount of liquid that is supplied into the stirring tank, a kind and a supply amount of a gas that is supplied into the stirring tank and power that is supplied to the stirrer; a setting part that calculates the installation position for the auxiliary stirrer from the first information, the second information and the reference information to set a candidate for the installation position; and an output part that calculates a mixture ratio of a gas and liquid in the candidate for the installation position by performing fluid analysis of the kinds of the gas and the liquid, and outputs the mixture ratio in the installation position and the installation position.SELECTED DRAWING: Figure 2

Description

The present invention relates to a support system and a support method. More specifically, the present invention relates to a support system and a support method for assisting in determining an installation position when an auxiliary stirrer is added in a gas-liquid mixing device used for mixing a gas and a liquid.

For a chemical reaction in a chemical plant or the like, a mixing device for stirring and mixing liquid substances in a stirring tank using a stirring blade is widely used. In such a mixing device, various studies have been made in order to improve the mixing efficiency of gas and liquid.

For example, in Patent Document 1, a stirring shaft is hung from the center of the stirring tank, a stirring blade is provided at the lower end of the stirring shaft, and the stirring blade is fixed to the bottom of the stirring tank so as to be arranged near the outer side of the stirring blade. A mixing device provided with blades has been proposed. According to the mixing device of Patent Document 1, a flow from the lower side to the upper side occurs near the inner wall surface of the stirring tank, and this flow gathers in the central part and its vicinity, and the flow from the upper side to the lower side in the central part and its vicinity. Is generated, and it is disclosed that the swirling flow is converted into a radial discharge flow by the blade fixed to the bottom at the bottom thereof, and the mixing efficiency can be improved.

Japanese Unexamined Patent Publication No. 2018-027544

By the way, in the gas-liquid mixing device, gas is usually supplied from the lower part of the stirring tank. At this time, when the stirring power is weak or the like, the coalescence may proceed too much until the bubbles reach the upper part of the stirring tank. In addition, the bubbles may not be sufficiently diffused. As described above, when the stirring power is weak or the like, the mixing of the entire stirring tank may not be sufficient. For this reason, the designers and users of the gas-liquid mixing device consider changing the stirring blade, etc., but it may be difficult to install it when adding it to an existing facility.

It is an object of the present disclosure to provide a support system and a support method for assisting in determining an installation position when an auxiliary stirrer is added in a gas-liquid mixing device used for mixing a liquid and a gas.

When the baffle is provided inside the stirring tank, the stirring flow generated in the lower part of the liquid material in the stirring tank has a rotation direction opposite to that of the circulating flow generated in the upper part of the liquid material in the stirring tank. It may flow. The flow from the inner wall of the stirring tank generated at the boundary of these flows (hereinafter, also referred to as “circulating flow boundary”) toward the stirring shaft (center of the stirring tank) (hereinafter, also referred to as “circulating flow boundary flow”). ) May inhibit mixing between the liquid material belonging to the circulating flow in the upper part of the stirring tank and the liquid material belonging to the stirring flow in the lower part. Inhibition of mixing by the flow at the circulation boundary can be suppressed by an auxiliary stirrer including an extending portion extending from the stirring shaft toward the inner wall of the stirring tank. It has been found that the mixing effect of the auxiliary stirrer differs depending on the installation position depending on the shape of the stirrer, the type and shape of the stirrer, the type and supply amount of the liquid and gas supplied in the stirrer, the amount of power, and the like. .. Specifically, the present disclosure provides:

(1) In a gas-liquid mixing device having a stirring tank, a stirrer for stirring gas and liquid, a baffle plate provided inside the stirring tank, and a gas supply pipe arranged below the stirrer. , A support system that assists in determining the installation position of the auxiliary stirrer to be added to the stirrer.
The first information regarding the shape of the stirring tank, the second information regarding the type and shape of the stirring machine, the type and amount of the liquid supplied into the stirring tank, the type of the gas supplied into the stirring tank, and the like. An acquisition unit that acquires the supply amount and reference information including at least the power supplied to the stirrer, and
A setting unit that calculates the installation position of the auxiliary stirrer from the first information, the second information, and the reference information, and sets a candidate for the installation position of the auxiliary stirrer.
The mixing ratio of the gas and the liquid in the installation position candidate is calculated by performing fluid analysis from the type of the gas and the type of the liquid, and the mixing ratio of the auxiliary stirrer at the installation position is the installation position. Equipped with an output unit that outputs with
Support system.

(2) The stirrer includes a stirrer shaft and a stirrer blade.
The second information includes a third information regarding the shape of the stirring blade.
The setting unit calculates the range of the installation position using the third information and the reference information.
The output unit outputs both the range and the mixing ratio.
The support system described in (1).

(3) Further provided with a reception unit for receiving an instruction to change the installation position of the auxiliary stirrer from the user.
The setting unit calculates the mixing ratio based on the change instruction.
The support system described in (2).

(4) Further provided with a presentation unit that presents the mixing ratio together with information on a plurality of installation position candidates corresponding to the mixing ratio so that the user can select the mixing ratio.
The support system according to any one of (1) to (3).

(5) In a gas-liquid mixing device having a stirring tank, a stirrer for stirring gas and liquid, a baffle plate provided inside the stirring tank, and a gas supply pipe arranged below the stirrer. It is a support method for supporting the determination of the installation position of the auxiliary stirrer to be added to the stirrer.
The first information regarding the shape of the stirring tank, the second information regarding the type and shape of the stirring machine, the type and amount of the liquid supplied into the stirring tank, the type of the gas supplied into the stirring tank, and the like. Obtain the supply amount and reference information including at least the power supplied to the stirrer.
The installation position of the auxiliary stirrer is calculated from the first information, the second information, and the reference information, and the installation position candidate of the auxiliary stirrer is set.
The mixing ratio of the gas and the liquid in the installation position candidate is calculated by performing fluid analysis from the type of the gas and the type of the liquid, and the mixing ratio of the auxiliary stirrer at the installation position is the installation position. Output with,
Support method.

According to the present disclosure, in a gas-liquid mixing device used for mixing a gas and a liquid, it is possible to assist in determining an installation position when an auxiliary stirrer is added.

Schematic diagram of the cross section of the gas-liquid mixer to be designed. The block diagram which shows an example of the support system which concerns on this embodiment. The figure which shows an example of the flow of the process performed in the support system which concerns on this embodiment. The figure which showed an example of the installation position of the auxiliary stirrer. An example of presenting an installable position according to this embodiment. An example of the output result of the support system according to this embodiment. The schematic diagram which shows the flow generated when a gas and a liquid are agitated in a gas-liquid mixer. The schematic diagram of the attachment device of the auxiliary stirrer which concerns on this embodiment. Schematic diagram of the auxiliary stirrer according to this embodiment, (a) schematic top view, and (b) schematic side view. The figure which shows an example of the presentation screen of the candidate list of an auxiliary agitator. The vertical sectional schematic view of the gas-liquid mixing apparatus 1 for demonstrating the calculation method of a circulation flow boundary. The figure which shows an example of the processing flow of the modification of this embodiment. The block diagram which shows the hardware configuration example of this embodiment.

Hereinafter, specific embodiments of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail. However, the present invention is not limited to the following embodiments, and various modifications can be made without changing the gist of the present invention. In each drawing, the same components may be designated by the same reference numerals and duplicate explanations may be omitted.

In the present embodiment, the solid, the liquid, and the gas (gas) refer to the three states of the substance itself. Liquids may include (pure) liquids, liquids including gases (including gases introduced from gas supply pipes), solutions and slurries.

≪Support system and support method≫
[Overview of gas-liquid mixer]
First, an outline of the gas-liquid mixing device, which is the design target of the support system and the support method according to the present embodiment, will be described. This gas-liquid mixing device includes a stirring tank, a stirring machine, a baffle plate, and a gas supply pipe. A liquid or a liquid material is stored in a stirring tank, and gas is supplied to perform gas-liquid mixing. Here, the stirring flow generated in the lower part of the liquid material in the stirring tank may flow in a rotation direction opposite to that of the circulating flow generated in the upper part of the liquid material in the stirring tank. The flow from the inner wall of the stirring tank to the stirring shaft (center of the stirring tank) generated at those boundaries (hereinafter, also referred to as “circulating flow boundary”) (hereinafter, also referred to as “circulating flow boundary flow”). Inhibits mixing between the liquid material belonging to the circulating flow at the top of the stirring tank and the liquid material belonging to the stirring flow at the bottom. Therefore, in order to suppress the inhibition of mixing due to the flow at the boundary of the circulating flow, an auxiliary stirrer including an extending portion extending from the stirring shaft toward the inner wall of the stirring tank is provided.

On the other hand, it is necessary to add an auxiliary stirrer to the existing gas-liquid mixing device while avoiding the ones that have already been installed, including the columns and jigs. Therefore, it is not always possible to install it in the optimum location. In the support system and the support method according to the present embodiment, it is possible to support the determination of the installation position of the auxiliary stirrer so that the user can select the desired position with reference to the mixing ratio of the gas-liquid mixture. can.

FIG. 1 is a schematic vertical sectional view of a gas-liquid mixing device, which is a design target of the support system according to the present embodiment. As shown in FIG. 1, the gas-liquid mixing device 1 includes a stirring tank 11, a stirring machine 12, baffle plates 13 (13a, 13b), a gas supply pipe 14, and an auxiliary stirring tool 15. The liquid substance L is contained in the stirring tank 11. The stirrer 12 has a stirrer shaft 121 and a stirrer blade 122 provided on the stirrer shaft 121. The auxiliary stirrer 15 includes an extending portion 151 installed on the stirring shaft 121 and extending from the stirring shaft 121 toward the inner wall of the stirring tank 11.

Such a gas-liquid mixing device 1 can be used to supply a gas to the liquid substance L to obtain a solution in which the components in the gas are solutes and the components in the liquid substance L are used as a solvent. It can also be used to supply a gas to the liquid L containing the chemical solution used for the chemical reaction to obtain a reaction product generated between the chemical solution and the components in the gas. As described above, the gas-liquid mixing device 1 can be used for any application as long as it is intended to mix the gas and the liquid substance L. The gas-liquid mixing device 1 may be provided with a supply mechanism for supplying a drug, a solvent, or the like into the stirring tank 11, if necessary.

[Configuration of support system and support method using support system]
Next, the configuration of the support system and the support method using the support system according to the present embodiment will be described. FIG. 2 is a configuration diagram showing an example of the support system 20 according to the present embodiment. As shown in FIG. 2, the support system 20 has a reception unit 22 for receiving an instruction to change the installation position of the auxiliary stirrer 15 from the user as needed, and a presentation for presenting the output result so that the user can select it. It includes a unit 23 and a control unit 21. The control unit 21 has first information regarding the shape of the stirring tank 11, second information regarding the type and shape of the stirring tank 12, the type and supply amount of the liquid supplied to the stirring tank 11, the type and supply amount of gas, and the stirring machine 12. The acquisition unit 24 that acquires reference information including at least the power supplied to the device, and the setting unit that calculates the installation position of the auxiliary stirrer from the first information, the second information, and the reference information, and sets the installation position candidate of the auxiliary stirrer. 25. It is provided with an output unit 26 that calculates the mixing ratio of gas and liquid in the installation position candidate based on fluid analysis and outputs the mixing ratio at the installation position of the auxiliary stirrer together with the installation position. The "shape" of the stirring tank 11 and the stirring machine 12 includes at least the shape and size (dimensions).

FIG. 3 is a flowchart showing an example of the flow of processing performed by the support system 20 according to the present embodiment.

First, the acquisition unit 24 has first information about the shape of the stirring tank 11, the type of the stirrer 12, the second information about the shape, the type and supply amount of the liquid supplied to the stirring tank 11, the type and supply amount of gas, and the stirrer. Acquire reference information including at least the power supplied to 12 (step 1001). The shape, material, etc. of the stirring tank 11 and the stirring machine 12 are acquired from a storage unit or the like prepared in advance. Similarly, for the liquid and gas to be stirred and mixed, the type, physical property value, etc. are acquired from a separately prepared storage unit. Predetermined values may be set in advance for the amount of liquid supplied to the stirring tank 11, the amount of gas, and the stirring power of the stirrer 12, or the input of the user's desired value may be received from the reception unit 22. good.

Next, the setting unit 25 calculates the installation position of the auxiliary stirrer 15 from the first information, the second information, and the reference information, and sets the installation position candidate of the auxiliary stirrer 15 (step 1002). The method of calculating the preferred installation position of the auxiliary stirrer 15 in the stirring tank 11 will be described later, but the installation position of the auxiliary stirrer 15 is the volume of the liquid material (mixing of liquid and gas) in the stirring tank 11 and the stirring tank. It can be calculated from the diameter of 11 and the diameter of the stirring blade 122.

Further, the range of the installation position of the auxiliary stirrer 15 which is considered to be effective in improving the mixing ratio of gas and liquid by installing the auxiliary stirrer 15 is the rotation speed of the stirrer 12 and the shape (length) of the stirrer blade 122. ) Can be calculated. Therefore, it is preferable that the acquisition unit 24 further acquires the third information regarding the shape of the stirring blade 122, and then the setting unit 25 calculates the range of the installation position by using the third information and the reference information.

Next, the output unit 26 calculates the mixing ratio of the gas and the liquid at the position where the auxiliary stirrer 15 is installed by using the fluid analysis (step 1003). Fluid analysis refers to a method of numerically analyzing the motion between a target gas and a liquid using the Navier-Stokes equation or the like. Specifically, model data in which the internal shape of the target stirring tank 11 is discretized is created. For example, the inside of the stirring tank 11 is divided in a grid pattern, and the input / output of the fluid is calculated by a common function for each divided small area. By repeating this calculation, the movement of the fluid in the target model is approximated. As a result, the ratio of liquid to gas in each lattice, that is, the mixing ratio can be calculated. The output unit 26 calculates the mixing ratio in this way and outputs it together with the installation position of the auxiliary stirrer 15 (step 1005).

When the third information regarding the shape of the stirring blade 122 is used as described above, the output unit 26 may output the mixing ratio corresponding to the range of the set position together with the range of the set position. If the range in which the auxiliary stirrer 15 is installed and considered to be effective, that is, the range of the appropriate installation position is larger than the installation width of the stirrer blade 122 of the auxiliary stirrer 15 to be added, the auxiliary stirrer 15 is installed. There can be multiple position candidates. For example, as shown in FIG. 4, the installation position of the auxiliary stirrer 15 (S _s ; (I)) and the position of the two ends ((II), (III)) of the appropriate installation range are the installation positions. Set as a candidate. When there are a plurality of set installation position candidates (step 1004), the output unit 26 performs fluid analysis for each installation position candidate and outputs the installation position and the mixing ratio.

As the installation position of the auxiliary stirrer 15, for example, information about the shape and size of the auxiliary stirrer 15 to be used may be received from the user so that the user can select from a plurality of installation position candidates. For example, as shown in FIG. 5, the presentation unit 23 presents the optimum installation position of the auxiliary stirrer 15 and selectable installation candidates. Further, for example, by selecting the installation position presented as shown in FIG. 6, the mixing ratio of the gas and the liquid may be calculated at the installation position and output together with the installation position.

As an initial setting of the support system 20, such as an initial stage in which an appropriate auxiliary stirrer 15 is not determined by the user, for example, a rod-shaped jig having a cross section of 5 cm square may be set in advance and used. By exemplifying the case of the initial setting, the user can easily change the shape of the auxiliary stirrer 15. The support system 20 may accept such a shape change instruction and recalculate.

[Significance of installing an auxiliary stirrer]
In the following, the mechanism of forming the circulation flow boundary B and the significance of the auxiliary agitator 15 will be described with reference to FIG. 7. FIG. 7 is a schematic view showing a flow of a liquid substance (a mixture of a liquid and a solid) generated when a liquid substance (a mixture of a liquid and a solid) is contained in a stirring tank and the mixture is stirred.

Inside the stirring tank 11, the liquid material L in the stirring tank 11 is stirred, the gas is supplied to the liquid material L, and the baffle plate 13 provided in the stirring tank 11 is placed on the upper part of the liquid material L. A circulating flow C is generated, and a stirring flow S is generated at the lower part. Then, due to these flows, a flow from the inner wall side to the stirring shaft 121 (circulating flow boundary flow) is generated at the boundary. The boundary flow of the circulating flow suppresses the mixing between the circulating flow C in the upper part of the liquid material and the stirring flow S in the lower part, and the mixing ratio of the liquid and the liquid is unlikely to be high. Therefore, an auxiliary stirrer 15 is provided to promote mixing between the upper circulation flow C and the lower stirrer flow S of the liquid material L.

First, the mechanism by which the circulating flow boundary B is generated will be described. When the stirring blade 122 rotates, a liquid substance is discharged toward the lower part of the stirring tank 11, and a flow due to stirring is generated. Of the flow due to the stirring, the component parallel to the stirring shaft 121 becomes a flow from the stirring blade 122 toward the bottom surface of the stirring tank 11. Further, the component perpendicular to the stirring shaft 121 is directed from the stirring blade 122 toward the inner wall of the stirring tank 11, and this component is a swirling flow having a component in the rotation direction of the stirring blade 122.

Of the flow due to stirring, the main component toward the bottom surface of the stirring tank 11 collides with the bottom surface of the stirring tank 11 and becomes a flow that directly follows the bottom surface toward the inner wall of the stirring tank 11. Then, when this flow collides with the inner wall, it becomes a flow upward along the inner wall.

Of the flow due to stirring, the component perpendicular to the stirring shaft 121 collides with the inner wall of the stirring tank 11 and then swirls along the inner wall in the rotation direction of the stirring blade. However, since the baffle plate 13 is installed, it collides with the baffle plate 13 and changes the direction of the flow, merges with the component perpendicular to the stirring shaft 121, and becomes an upward flow.

Further, the liquid material L in the stirring tank 11 circulates in the stirring tank 11 by stirring with the stirring machine 12. Of the flow due to stirring, the flow becomes an ascending flow along the inner wall of the stirring tank 11, becomes a flow along the circulation flow boundary B, and finally reaches the upper part of the stirring blade 122. From there, this flow becomes a flow toward the stirring shaft 121 again in the stirring tank 11 and is discharged toward the lower part of the stirring tank 11. The liquid L in the stirring tank 11 constantly repeats the above to form a circulating stirring flow S.

On the other hand, the gas supplied from the gas supply pipe 14 becomes bubbles in the liquid material L in the stirring tank 11. Buoyancy is generated in the bubbles due to the difference in density from the surrounding liquid L. Here, the flow rate due to stirring increases as it progresses from the stirring blade 122 to the gas supply pipe 14, and from the gas supply pipe 14 to the bottom surface of the stirring tank 11, the inner wall, the circulation flow boundary B, and the vicinity of the stirring shaft 121 of the circulation flow boundary B. It becomes slower and the force to split the bubbles in the flow (so-called shear stress) becomes smaller. In the flow of stirring slowed down in this way, the bubbles coalesce and the bubble diameter gradually increases. The buoyancy generated in a bubble is proportional to the cube of the diameter of the bubble. Also, the drag generated between the bubble and the flow is proportional to the square of the diameter of the bubble. Therefore, when the bubble becomes large to some extent, the buoyancy becomes stronger than the drag force acting during the descending flow in the stirring tank 11, and the bubble floats away from the descending flow. The generation of bubbles that float away from the descending flow causes a reaction of the drag of the liquid acting on the bubbles, and the flow around the bubbles becomes an ascending flow. Therefore, in the vicinity of the stirring shaft 121, the upper part of the stirring tank 11 becomes an ascending flow and the lower part of the stirring tank 11 becomes a descending flow. In this way, a circulating flow C that rotates in the opposite direction to the stirring flow S, including the rising flow generated in the vicinity of the stirring shaft 121, is formed above the stirring flow S. In this reverse rotation circulation flow C, the flow flowing to the stirring shaft 121 via the vicinity of the inner wall of the stirring tank 11 is in contact with the flow above the stirring flow S. A circulation flow boundary B is formed at a portion where the circulation flow C and the stirring flow S are in contact with each other due to this buoyancy, and a circulation flow boundary flow from the stirring tank 11 toward the stirring shaft 121 is generated. Then, such a circulating flow boundary flow may hinder mixing between the liquid material belonging to the upper circulating flow C and the liquid material belonging to the lower stirring flow S in the stirring tank 11.

Therefore, an auxiliary stirrer 15 including an extending portion 151 extending from the stirring shaft 121 toward the inner wall of the stirring tank 11 is provided, and the circulation flow is rotated together with the stirring blade 122 according to the rotation of the stirring shaft 121. The boundary flow is made to collide with the auxiliary agitator 15 and the flow generated by the auxiliary agitator 15 to create a flow different from the circulating flow boundary flow. This makes it possible to promote mixing between the upper part and the lower part of the liquid material L in the stirring tank 11.

[Example of specific configuration of gas-liquid mixer]
Next, the gas-liquid mixing device 1 will be described in more detail (see FIG. 1).

(Stirring tank)
The stirring tank 11 is a cylindrical tank (container). At least one end (bottom surface) of the stirring tank 11 is closed, and the liquid substance L can be contained therein. On the one hand, the other end (upper surface) may be open or closed.

The shape of the stirring tank 11 is not particularly limited as described above, but from the viewpoint of preventing retention due to the flow, it is preferable to use a circular shape or a polygonal shape having all angles of 90 ° or more.

The upper surface (when closed) and the lower surface are not limited to those having a plane, respectively, and include a portion having a curvature on the upper surface or the bottom surface in a vertical cross-sectional view cut in the vertical direction, or the upper surface, the bottom surface, and the inner wall. Those including a portion having a curvature between and can be used.

As described above, the liquid L is not particularly limited, and a solution-like liquid or a slurry-like liquid in which a solid content is dispersed in a solvent can be used. The chemical solution and the like may include those that contribute to a chemical reaction, as well as a component adjusting agent for the chemical solution, a trace amount of a dispersant and a surfactant that do not contribute to the chemical reaction, and the like. Further, the liquid containing a chemical liquid or the like can also include a liquid such as a solvent or a diluted liquid. When a chemical reaction occurs inside this, the type is not particularly limited.

(Stirrer)
The stirrer 12 includes a stirring shaft 121 hanging from the upper part of the stirring tank 11, a stirring blade 122 provided perpendicular to the stirring shaft 121, and an extension extending from the stirring shaft 121 toward the inner wall of the stirring tank 11. It has an auxiliary stirrer 15 including an existing portion 151. The stirrer 12 has, for example, a motor, and the rotation of the motor is transmitted to the stirring shaft 121 to stir. The stirring shaft 121 rotates as a rotating shaft to stir the liquid material L contained in the stirring tank 11. A stirring flow is generated, and the stirring flow mixes with the gas supplied from the gas supply pipe 14.

The stirring blade 122 is not particularly limited as long as it can generate an axial flow, and specifically, a propeller blade or a paddle blade can be used. Further, as the stirring blade 122, it is preferable to use one composed of two or more stirring blades in order to prevent shaft shake. For example, when a propeller blade is used as the stirring blade 122, the number of blades may be three or more. When a paddle blade is used as the stirring blade 122, the number of blades may be two or more. In any case, the number of blades is preferably 16 or less, but may be 17 or more.

Further, it is preferable that the stirring shaft 121 is arranged so that the center thereof coincides with the center of the cross section of the stirring tank 11 in the cross-sectional view of the stirring tank 11.

(Baffle board)
The baffle plate 13 (13a, 13b) is arranged in the stirring tank 11. For example, when the stirring tank 11 is viewed from above, the baffle plate 13 is arranged so as to stand upright from the inner wall side of the stirring tank 11 toward the center of the stirring tank 11. The flow of the liquid material L generated by the stirrer 12 is mainly a flow that swirls in the horizontal direction, but by using the baffle plate 13, the flow in the vertical (vertical) direction can be made stronger. However, when this vertical (vertical) flow is weak, the stirring flow generated in the lower part of the stirring tank 11 does not reach the upper part, and the rotation direction is opposite to that of the circulating flow generated in the upper part of the stirring tank 11. Flow with. At the boundary between the lower stirring flow S and the upper circulating flow C (circulating flow boundary), both flows flow from the stirring tank 11 toward the stirring shaft 121 and strengthen each other. In this way, the strong flow in the direction from the stirring tank 11 to the stirring shaft 121 (circulating flow boundary flow) generated at the boundary of the circulating flow hinders mixing between the upper part and the lower part of the stirring tank 11.

Here, the height of the baffle plate 13 means the distance in the longitudinal direction of the stirring tank 11. The width of the baffle plate 13 means the width of the baffle (obstruction plate) in the direction from the inner tank of the stirring tank toward the central axis, and is the horizontal direction of the surface of the baffle plate 13 when the stirring tank 11 is viewed from above. The length.

The height of the baffle plate 13 is not particularly limited, but it is preferable to use one that is higher than the liquid height of the liquid material L, which is the distance from the bottom surface of the stirring tank 11 to the liquid surface. The baffle plate 13 does not have to be arranged in contact with the bottom surface.

As the baffle plate 13, one or a plurality of baffle plates 13 can be used. From the viewpoint of further increasing the stirring efficiency in the stirring tank 11, it is preferable to use a plurality of baffle plates 13. When a plurality of baffle plates 13 are used, it is preferable to arrange them at equal intervals when the stirring tank 11 is viewed from above, from the viewpoint of further improving the stirring efficiency in the stirring tank 11.

The baffle plate 13 does not necessarily have to be in contact with the inner wall or bottom of the stirring tank 11, and may be separated from the inner wall or bottom of the stirring tank 11.

(Auxiliary stirrer)
The auxiliary stirrer 15 includes an extending portion 151 arranged on the stirring shaft 121 and extending from the stirring shaft 121 toward the inner wall of the stirring tank 11. In the auxiliary stirrer 15, the extending portion 151 is arranged at least in a portion of the stirring shaft 121 above the stirring blade 122.

The bubbles supplied from the gas supply port of the gas supply pipe 14 ride on the flow of the liquid substance L in the stirring tank 11 by stirring, and finally the bubbles are united in the vicinity of the stirring shaft 121. When the buoyancy of the grown bubbles is larger than the drag generated by the downward flow (effective flow generated in the vicinity) in the stirring tank 11, the inside of the stirring tank 11 is moved from the inner wall side to the central axis side of the stirring tank 11. Flow is generated stably. Since this circulating flow boundary flow has almost no shearing force, mixing is hardly performed between the upper part and the lower part of the liquid material L with this flow as a boundary (see FIG. 7).

Therefore, an auxiliary stirrer 15 is provided and rotated together with the stirring blade 122 according to the rotation of the stirring shaft 121. As a result, the circulating flow boundary flow is made to collide with the flow generated by the rotation of the auxiliary stirrer 15 and the extending portion 151 of the auxiliary stirring tool 15, and the flow is mixed at that portion and is different from the circulating flow boundary flow. The flow is in the vertical direction. The upward flow mixes with the circulating flow C at the top of the tank, and the downward flow mixes with the stirring flow S at the bottom of the tank. Therefore, it is possible to promote mixing between the upper part and the lower part of the liquid material L in the stirring tank 11.

The auxiliary stirring tool 15 can be appropriately designed in consideration of the shape and size of the stirring tank 11, the stirring shaft 121, the stirring blade 122, etc., the increase in rotational power when the auxiliary stirring tool 15 is installed, and the like.

The mass of the auxiliary stirrer 15 is not particularly limited, but is preferably 1/2 or less of the total mass of the stirring shaft 121 and the stirring blade 122 from the viewpoint of increasing the stirring efficiency without increasing the initial stirring power. However, since a large stirring power is not required once the stirring shaft 121 starts to rotate, the mass of the auxiliary stirring tool 15 may be more than 1/2 of the total mass of the stirring shaft 121 and the stirring blade 122.

FIG. 8 is a schematic view of an auxiliary stirrer attachment device. As shown in FIG. 8, as the auxiliary stirrer 15, for example, in the mounting device 152 that covers at least a part around the stirring shaft 121, the extending portion 151 is formed so as to extend from the outer surface. Can be done. The stirring shaft and the extending portion may be integrally formed.

The shape of the auxiliary stirrer 15 is not particularly limited to a disk shape centered on the stirring shaft 121, and may be any shape such as a rod shape, a plate shape, or a combination of rod-shaped parts. It's okay. The volume of the rotating body formed with the stirring shaft 121 of the auxiliary stirring tool 15 as the rotating shaft from the viewpoint of more efficiently mixing the upper circulating flow C and the lower stirring flow S of the liquid material L in the stirring tank 11. It is preferable to make it smaller. For example, rather than arranging the rectangular plate-shaped auxiliary stirrer 15 in the width direction so as to coincide with the vertical direction of the stirring tank 11, the width direction of the rectangular frame-shaped (for example, "R" -shaped) auxiliary stirrer 15 It is preferable to arrange the stirring tanks 11 so as to coincide with each other in the vertical direction because the volume of the rotating body is reduced. This reduces the power required for the assistive device. However, when the rod-shaped auxiliary stirrer 15 is used in a state where it intersects the stirring shaft 121 perpendicularly, the range in which the mixing effect can be obtained is narrow in the vertical direction of the stirring tank 11.

The number of the auxiliary stirrers 15 is not particularly limited as long as it is 1 or more. Further, the size of the auxiliary stirrer 15 is not particularly limited.

9A and 9B are schematic views of an example of the auxiliary stirrer according to the present embodiment, where FIG. 9A is a schematic top view and FIG. 9B is a schematic side view. The "upper surface" and "side surface" of the auxiliary stirrer 15 coincide with the "upper surface" and "side surface" of the stirring tank 11 in the installed state of the auxiliary stirrer 15.

The auxiliary stirrer 15a shown in FIG. 9 has two extending portions 151a extending in a straight line extending from the attachment device 152a, and as shown in the side view (FIG. 9B), 2 The two extending portions 151a are arranged on one horizontal plane.

Here, FIG. 10 shows an example of a screen for presenting a list of candidates for the auxiliary stirrer 15. For example, the candidates of the auxiliary stirrer 15 are stored in the database (DB) in advance, and a list of candidates as shown in FIG. 10 is presented on the screen (candidate list presentation screen 50) in response to the user's request, and the user. The auxiliary stirrer 15 may be set by selecting. Further, the size and length of the auxiliary stirrer 15 may be prompted to be input according to the size of the stirrer tank 11 or the like by referring only to the shape of the auxiliary stirrer 15. Although FIG. 10 shows a screen for presenting a list of candidates for the auxiliary stirrer 15 as described above, other shape examples of the auxiliary stirrer 15 are also shown, and the auxiliary stirrer 15 is shown in FIG. 9 for convenience of explanation. Similar to the stirrer 15a, the reference numerals of the auxiliary stirrers 15 having other shapes are set to "15b" to "15g", and the codes of the extending portions 151 are set to "151b" to "151g", respectively. The reference numerals are shown as "152b" to "152g".

(Gas supply pipe)
The gas supply pipe 14 is arranged below the stirring blade 122 and supplies gas from the gas supply port. The gas supply pipe 14 has at least a gas supply port inside the stirring tank 11.

The gas supplied from the gas supply port of the gas supply pipe 14 becomes bubbles in the liquid, which causes buoyancy. In order for the circulating flow boundary flow to be constantly present at a stable position, it is preferable to keep the buoyancy generated in the bubbles in a small state in the vicinity of the gas supply pipe 14 and to put it on the circulating flow by stirring by the stirrer 12. The smaller the bubble diameter, the smaller the buoyancy, but for that purpose, it is preferable to place the bubbles in a stirring flow near the gas supply pipe 14. Therefore, the position of the gas supply pipe 14 is preferably arranged below the stirring blade 122.

Further, the gas supply pipe 14 may be provided with a gas supply port such as a single pipe or a plurality of pipes. A ring-type spudger may be used as the gas supply pipe 14 in order to efficiently disperse the gas supplied to the liquid L as bubbles and generate a circulating flow boundary flow so as to have little bias in the height direction. preferable. The shape of the gas supply pipe 14 does not matter as long as the gas can be supplied around the stirring shaft 121.

The gas supply amount is not particularly limited, but is preferably 1/10000 or more and 1/100 or less per second, and is 1/50000 or more and 1/200 or less with respect to the amount of the liquid material L on a volume basis. It is more preferably 1/20000 or more and 1/500 or less.

The type of gas is not particularly limited, and for example, a gas such as air, nitrogen, or oxygen can be used in the liquid L according to a desired chemical reaction. In addition to the gas that functions as a direct drug that reacts only between the gas and the liquid containing the chemical solution in the liquid L, the reaction affects the chemical reaction in the liquid L. It can also contain a gas that acts as a reaction aid that contributes. For example, in a chemical reaction in a liquid material L, when the dissolved oxygen in the liquid material L affects this chemical reaction, nitrogen is supplied from the gas supply pipe 14 to reduce the amount of the dissolved oxygen. Nitrogen in the case of reduction corresponds to this.

(Additional part for chemicals, etc.)
The gas-liquid mixing device 1 may be provided with an addition unit such as a chemical solution, depending on its use. The chemical solution addition section adds the chemical solution or the like to the liquid material L of the stirring tank 11.

As the chemical solution, a solution containing a liquid solution, a slurry, or a solution containing a solid substance according to a desired chemical reaction can be used. It can also contain a component adjusting agent for a chemical solution, a trace amount of a dispersant and a surfactant that do not contribute to a chemical reaction, and the like.

[Calculation of optimum position and proper installation range of auxiliary stirrer]
Here, when the auxiliary stirrer is additionally installed in the stirrer, the appropriate position (optimum position) and the appropriate installation range can be calculated by, for example, the following method. The optimum position and the appropriate installation range are calculated from the type and supply amount of the liquid material L supplied into the stirring tank 11, the type and supply amount of gas supplied into the stirring tank from the gas supply pipe 14, and the stirring power. The installation position is the position in the vertical direction of the auxiliary stirrer 15 (the height direction of the stirrer tank 11). The optimum position is, for example, a circulating flow boundary. The method of calculating the position of the circulation flow boundary (height from the bottom of the stirring tank 11) will be described in detail below with reference to FIG. FIG. 11 is a schematic vertical sectional view of a gas-liquid mixing device for explaining a method of calculating a circulating flow boundary. In addition, "optimal" and "appropriate" mean "optimal" and "appropriate" in calculation.

と表すことができる。 First, the height of the circulation flow boundary on the inner wall side of the stirring tank 11 is S _s , and the height of the circulation flow boundary on the stirring shaft 121 side is _Se . The height of the circulation flow boundary is the distance from the bottom of the stirring tank 11. Assuming that the difference between the height S _s of the circulating flow boundary on the inner wall side of the stirring tank 11 and the height S _e of the circulating flow boundary on the stirring shaft 121 side is y, the height S _e of the circulating flow boundary on the stirring shaft 121 side is ,

It can be expressed as.

で表すと仮定し、反応槽内の代表流速をＶ_２とした場合に、

と表すことができることが分かった。式（３）を用いた場合、高さＳ_ｅは攪拌槽１１の代表長Ｌの１０％以内の誤差で推定可能である。 Here, according to the inventor's experiment _, the flow velocity v at the distance r3 from the stirring shaft was determined.

_Assuming that it is represented by, when the representative flow velocity in the reaction vessel is V2,

It turned out that it can be expressed as. When the formula (3) is used, the height Se can be estimated with an error within 10% of the representative length _L of the stirring tank 11.

で表すことができる。 Note that V ₂ can be calculated from the discharge flow rate V _s from the stirring blade 122 and the volume of the liquid material, and the discharge flow rate V _s is proportional to d (diameter of the stirring tank 11) and r ₂ (diameter of the stirring blade 122). To do

Can be represented by.

Further, the circulating flow boundary flow is regarded as a flow in which an ascending flow generated from the bottom of the stirring tank 11 along the inner wall and a descending flow generated along the inner wall from the upper part (liquid level) of the stirring tank 11 merge. It is also possible.

If the representative velocity V _btm of the liquid substance near the bottom surface of the stirring tank 11 and the representative velocity V _top of the liquid substance on the liquid surface can be measured by a flow velocity meter, the height of the liquid substance L in the stirring tank 11 ( As the height of the liquid level) h and the height imp _top from the bottom surface of the stirring tank 11 to the top of the stirring blade 122, S _s may be obtained as follows.

として、式（４）又は（５）に代入し、Ｖ_２を算出する。 Further, assuming that the rotation radius of the stirring blade 122 is r2 and the rotation speed of the stirring blade 122 is ω, the _average velocity _v1 of the liquid material L discharged from the stirring blade 122 is the discharge flow rate Vs discharged from the stirring blade 122. Is divided by the discharge area πr ₂ ² (V _s / πr ₂ ² ). On the other hand, the discharge flow rate Vs is expressed as V _s ∝ω × (2r ₂ ) ³ when the diameter of the stirring blade 122 is 2r ₂ . Considering the width H of the stirring blades and the number n of the stirring blades 122, assuming that the discharge direction is only downward,

, Substituting into equation ( ₄ ) or (5) to calculate V2.

以内の距離に配置することが好ましい。 Further, the proper installation range is a range including the optimum position, and refers to a range in which the effect of mixing between the upper part and the lower part of the stirring tank 11 can be obtained by installing the auxiliary stirring tool 15. As an appropriate installation range, for example, in the stirring blade 122, when the horizontal length from the stirring shaft 121 to the end end is _rj (cm) and the rotation speed ω (rpm), the auxiliary stirring tool 15 is stirred. The range of the installation height in the direction of the axis 121 is from the circulation flow boundary to the top and bottom, respectively.

It is preferable to place them within a distance.

Further, in order to sufficiently obtain the effect of splitting the bubbles and reducing the diameter of the bubbles (reducing the diameter), it is preferable that the moving speed of the end of the auxiliary stirrer 15 is higher than the flow velocity of the flow at the boundary of the circulating flow.

During one operation (for example, from the start to the stop of the sequential reaction or during one batch reaction), the operation conditions are changed, such as changing the rotation speed of the stirring blade and changing the gas supply amount. In this case, it may be considered that the optimum position and / or the height of the appropriate installation range changes due to the influence of the change of the conditions.

Further, even when the operation is performed under the condition that the fluctuation of the circulation flow boundary is likely to occur and the fluctuation changes with a certain width, by providing a plurality of auxiliary stirrers 15 and arranging them in a part of the vicinity range. A sufficient mixing effect can be obtained even if only the generated effective flow is arranged so as to contact the circulation flow boundary (appropriate installation range).

[Calculation of mixing ratio]
When there are a plurality of installation position candidates determined as described above, the gas-liquid mixing ratio in each installation position candidate is determined by the type and supply amount of the liquid L, the type and supply amount of gas, and the power of the stirring blade 122. Calculated from.

The mixing ratio is not particularly limited as long as it is calculated from the type and supply amount of the liquid material L, the type and supply amount of gas, and the power of the stirring blade 122. Since the stirring tank 11 is in a turbulent state, the DNS method (direct numerical calculation by the Navier-Stokes equation) or the turbulent equation can be used to calculate the mixing ratio. As the turbulent equation, any model from the two-equation model to the seven-equation model, which is usually used for calculating the flow of the stirring tank, can be preferably used.

≪Variation example≫
The support system that assists in determining the installation position determines the mixing ratio when the stirring power used for the stirrer 12 is further changed at the designated auxiliary stirrer installation position based on the user's instruction (step 2003). It may be calculated and output (step 2004).

FIG. 12 is a flowchart showing an example of the flow of processing performed by the support system 20 according to the modified example of the present embodiment.

First, the processing flow of the acquisition unit 24 and the setting unit 25 (step 2001 and step 2002) is the same as the processing flow of the support system of the above-described embodiment (step 1001 and step 1002). Here, in addition to changing the installation position according to the user's instruction, a case of changing is illustrated. For example, the installation position is changed, and the stirring power is further changed.

For example, if the auxiliary stirrer 15 cannot be installed at the optimum position presented by the system and it is unavoidably installed at a position different from the optimum position, the stirring power may be changed so that it can be changed under the current conditions. Suppose.

Based on the user's instruction (step 2005), the output unit 26 calculates the mixing ratio of the gas and the liquid when the stirring power is increased by using fluid analysis (step 2006). The output unit 26 calculates the mixing ratio and presents it to the user together with the installation position of the auxiliary stirrer 15.

Since the calculation of the optimum position and the appropriate installation range and the display of the result are the same as those of the support system in the above-described embodiment, the description thereof is omitted here.

≪Hardware configuration of support system≫
Next, the hardware configuration of the support system 20 of the present embodiment will be described. FIG. 13 is a block diagram showing a hardware configuration example of the support system 20 of the present embodiment.

In the support system 20 of the present embodiment, the presentation unit 80, the communication I / F unit 81, the CPU (Central Processing Unit) 82, the ROM (Read Only Memory) 83, the RAM (Random Access Memory) 84, the HDD 85, and the like are connected by the bus 86. They are interconnected and have a hardware configuration that uses a normal computer. The CPU 82 is an arithmetic unit that controls the entire processing of the support system 20. The RAM 84 stores data necessary for various processes by the CPU 82. The ROM 83 stores a program or the like that realizes various processes by the CPU 82. The HDD 85 stores the data stored in each of the above-mentioned storage units. The communication I / F unit 81 is an interface for connecting to an external device or an external terminal via a communication line or the like and transmitting / receiving data to / from the connected external device or the external terminal. The presentation unit 80 corresponds to the presentation unit 23 described above. For example, a touch panel type in which a display device and a position input device are combined may be used, or output information may be presented to the display unit, and the reception unit 22 may separately receive a user's desired selected position.

A program for executing the above-mentioned various processes executed by the support system 20 of the present embodiment may be provided in the ROM 83 or the like in advance.

The program for executing the various processes executed by the support system 20 of the present embodiment has a module configuration including each of the above-mentioned units (acquisition unit 24, setting unit 25, output unit 26) via the control unit 21. It has become. As actual hardware, the CPU (processor) reads and executes each program from a storage medium such as the ROM 83, so that each part is loaded on the main storage device, and the acquisition unit 24, the setting unit 25, and the output unit 26 are loaded. It is designed to be generated on the main memory.

The various information stored in the HDD 85, that is, the various information stored in the storage unit may be stored in an external device (for example, a server). In this case, the external device and the CPU 82 may be connected to each other via a network or the like.

Although some embodiments of the present disclosure have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Gas-liquid mixer 11 Stirrer tank 12 Stirrer 121 Stirrer shaft 122 Stirrer blade 13, 13a, 13b Baffle plate 14 Gas supply pipe 15, 15a, 15b Auxiliary stirrer 151, 151a, 151b Extension part 151a, 151b Mounting device 20 Support System 21 Control unit 22 Reception unit 23, 80 Presentation unit 24 Acquisition unit 25 Setting unit 26 Output unit 50 Auxiliary stirrer candidate list presentation screen 81 Communication I / F unit 82 CPU
83 ROM
84 RAM
85 HDD
86 Bath L Liquid S Stirring flow C Circulating flow B Circulating flow boundary

Claims (5)

The stirrer in a gas-liquid mixer having a stirrer, a stirrer for stirring gas and liquid, a baffle plate provided inside the stirrer, and a gas supply pipe arranged below the stirrer. It is a support system that assists in determining the installation position of the auxiliary stirrer to be added to.
The first information regarding the shape of the stirring tank, the second information regarding the type and shape of the stirring machine, the type and amount of the liquid supplied into the stirring tank, the type of the gas supplied into the stirring tank, and the like. An acquisition unit that acquires the supply amount and reference information including at least the power supplied to the stirrer, and
A setting unit that calculates the installation position of the auxiliary stirrer from the first information, the second information, and the reference information, and sets a candidate for the installation position of the auxiliary stirrer.
The mixing ratio of the gas and the liquid in the installation position candidate is calculated by performing fluid analysis from the type of the gas and the type of the liquid, and the mixing ratio of the auxiliary stirrer at the installation position is the installation position. A support system equipped with an output unit that outputs together. The stirrer includes a stirrer shaft and a stirrer blade.
The second information includes a third information regarding the shape of the stirring blade.
The setting unit calculates the range of the installation position using the third information and the reference information.
The support system according to claim 1, wherein the output unit outputs both the range and the mixing ratio. Further provided with a reception unit for receiving an instruction to change the installation position of the auxiliary stirrer from the user.
The support system according to claim 2, wherein the setting unit calculates a mixing ratio based on the change instruction. The support system according to any one of claims 1 to 3, further comprising a presentation unit that presents the mixing ratio together with information on a plurality of installation position candidates corresponding to the mixing ratio so that the user can select the mixing ratio. The stirrer in a gas-liquid mixer having a stirrer, a stirrer for stirring gas and liquid, a baffle plate provided inside the stirrer, and a gas supply pipe arranged below the stirrer. It is a support method that assists in determining the installation position of the auxiliary stirrer to be added to.
The first information regarding the shape of the stirring tank, the second information regarding the type and shape of the stirring machine, the type and amount of the liquid supplied into the stirring tank, the type of the gas supplied into the stirring tank, and the like. Obtain the supply amount and reference information including at least the power supplied to the stirrer.
The installation position of the auxiliary stirrer is calculated from the first information, the second information, and the reference information, and the installation position candidate of the auxiliary stirrer is set.
The mixing ratio of the gas and the liquid in the installation position candidate is calculated by performing fluid analysis from the type of the gas and the type of the liquid, and the mixing ratio of the auxiliary stirrer at the installation position is the installation position. Support method to output with.

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