JPH0518619B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the structural technology field of an in-line type stirring device used for bleaching pulp liquid with oxygen.

The invention of this application is an in-line type stirring device that is installed in the middle of a flow pipe to be treated in a plant that bleaches the pipe liquid, and which connects an inlet pipe and an outlet pipe for the raw material. A fixed fin is provided in the axial direction on the inner surface of the cylindrical casing, and
This invention relates to a stirring device in which rotating fins are also provided in the axial direction on the circumferential surface of a rotating shaft connected to a drive device, and in particular, one or both of the fixed fins and rotating fins are triangular in the axial direction. The fins are formed into a plurality of fins of various shapes, etc., and the mounting positions of the fins in the axial direction can be freely adjusted to adjust the stirring gap between the opposing fixed fin and rotating fin, and has an ejection passage for fluid such as oxygen that intersects in the longitudinal direction in the direction in which one or both of the fixed fin and the rotating fin face each other, and furthermore, the ejection passage has a valve or a swivel. This invention relates to a stirring device connected to a fluid passage on the supply side via a joint.

<Prior art> As is well known, in plants of various manufacturing industries, stirring devices are used for various fluids to be processed, etc., but stirring devices are extremely important as chemical and mechanical equipment, and In order to influence accuracy, various types have been developed and used depending on the nature and purpose of the object to be processed.

Among these, flow-type agitation devices are superior to batch-type agitation devices in that they increase the throughput of the entire line, are more efficient, and require less power, and are widely adopted. One of these days,
In-line type stirring devices that perform forced stirring are widely used because they have low running costs, are compact, and have good stirring efficiency because they can also be used as flow channels.

<Problems to be Solved by the Invention> Therefore, in the in-line type stirring device that has been used conventionally, both the fixed fin provided on the inner surface of the pipe casing and the rotating fin provided on the rotating shaft are fixed. Since the position is fixed, there is a drawback that there is a low degree of freedom in that if the processing method of the processed material on the line is changed, the only way to deal with it is to change the rotation speed, and also a transmission device etc. is required. This makes the drive system extremely complicated.
In addition, there were also disadvantages in that the cost was high and maintenance, inspection, and maintenance were cumbersome.

In addition, when this type of device supplies different types of non-mixtures, it is only supplied from the inlet side, and therefore, there is a problem that the stirring and mixing rate in the flow process is poor.

For example, when bleaching pulp liquid in the paper industry, a new technology for bleaching with oxygen has recently been introduced to reduce the amount of raw materials to be processed and reduce costs compared to bleaching with chlorine dioxide. However, when supplying the oxygen to the in-line type stirring device, the conventional stirring device has the disadvantage that the gas-liquid contact efficiency in the flow path cannot be made uniform. Therefore, even in flow type stirring devices, a disk blade type stirring device is used to forcefully blow out oxygen and perform forced stirring and mixing in a short flow path. Therefore, since a special stirring device is provided and the stirring process is used, there is a risk that the stirring process cannot be used as a flow path.

In addition, in processes such as bleaching the seed pulp liquid, a so-called refining process is required in which the pulp fibers are aligned to a certain extent in a predetermined direction in response to stirring for bleaching, but in the conventional manner, the bleaching with oxygen described above This was not possible, and the complexity of having to provide a separate refining process by using a special stirring device had the disadvantage of restricting the line.

The purpose of the invention of this application is to solve the problems of the stirring device based on the above-mentioned prior art, which is unable to supply fluids such as other mixed gases, mix and stir, and cannot perform rectification in the flow path. As a technical issue, an in-line type stirring device, which is superior in various aspects, has good mixing and stirring efficiency, and also utilizes the process as a flow path for the stirring process. It is possible to sufficiently perform the rectifying action, which may seem to be a contradictory action, simplifying the processing process on the line, lowering the power cost, and furthermore, the structure is simple and requires almost no maintenance. This makes it possible to adjust the mounting position and mutual position of the fins for mixing, agitation, and refining in response to changes in the processing mode of the line, resulting in excellent agitation that benefits chemical and mechanical equipment applications in various industries. The aim is to provide the equipment.

<Means/effects for solving the problems> In order to solve the above problems, the structure of the invention of this application, which is based on the above-mentioned claims, is to improve the pipeline of a predetermined production plant. When the material to be processed flows in from the inlet pipe side of the stirring device installed midway and is fed to the next stage from the outlet pipe, a rotating shaft mounted concentrically inside the pipe casing is driven by a drive device. The rotating fins provided on the outer surface of the casing pipe are rotated by the casing pipe, and the rotating fins provided on the outer surface of the casing pipe are rotated at a predetermined speed relative to the fixed fins attached to the inner surface of the casing pipe, thereby uniformly mixing and agitating the flowing material to be processed. death,
In addition, mixing agitation and refining are performed by the axial rectification effect of a plurality of fins, and a rectification effect is applied to fibrous materials. When changing the mixing and agitation rectification in a machine, the mixing and agitation action can be changed by changing the mounting position of one or both of the fixed fins and rotating fins in the axial direction, thereby changing the gap between them and the mixing and agitation action. A plurality of ejection passages are provided in one or both of the stationary fins and the rotating fins in opposing directions, intersecting the axial direction, and the to-be-processed material flows through the stirring device. Furthermore, other fluid such as gas is jetted out to the object through a valve or a swivel joint, so that mixing and stirring are performed uniformly in the axial direction, and the length of the stirring device is The channel span in the horizontal direction is also used for the mixing and stirring process, promoting reactions, etc. through effects such as mixing and stirring with little power, and also reliably refining the fibrous material in the processed material. Technical measures have been taken to make this possible.

<Configuration of Embodiment> Next, an embodiment of the invention of this application will be described below based on the drawings.

The illustrated embodiment is an embodiment of an in-line type stirring device installed in a line for bleaching pulp liquid with oxygen in a paper manufacturing company, and in the embodiment shown in FIGS. This in-line type stirring device has an X-shape as a whole when viewed from the side, and an inlet pipe 2 bent with respect to a bleaching line (not shown) and an outlet type 3 are integrally connected to a linear mixing section 4. Front and rear bearing housings 5 and 6, which are linear with respect to the mixing section, are also integrally connected.

A hollow rotary shaft 8 is rotatably mounted on bearings 7 and 7 provided in the housings 5 and 6 (only the right side of the bearings is shown for convenience of illustration). It is connected to the bearing of the driving motor 9 through a joint 10 outside the housing 6 of the housing 6, and the housing 6 is provided with a seal water inlet 11 for the shaft seal portion and a seal water supply pipe 12. There is.

As shown in FIG. 3, on the side surface of the rotating shaft 8, a plurality of triangular rotating fins 13, 13 are provided at intervals of 90° in the circumferential direction and in a radially extending state in the axial direction. ...is integrally fixed by welding.

As shown in FIGS. 2 and 3, each rotary fin 13 has a predetermined number of small-diameter oxygen ejection passages 14 whose outer ends are formed as jet nozzles in a direction perpendicular to the axial direction. 14 are bored and communicate with the oxygen supply passage 8' inside the rotating shaft 8.

An oxygen supply pipe 8'' to the oxygen supply passage 8' is connected to the other end of the shaft 8.

On the other hand, in the casing 15 of the mixing section 4,
As shown in detail in FIGS. 2 and 3, the double pipe type oxygen supply passage 16 is formed in a ring shape in cross section.
Further, from the inner wall of the casing 15, three substantially right triangular fixing fins 17, 17, . The oblique sides thereof and the oblique sides of the rotating fins 13 of the rotating shaft 8 face each other to form a longitudinal zigzag stirring clearance 18 as shown in FIGS. 1 and 2.

Further, each of the fixed fins 17 is provided with a set number of small-diameter ejection passages 19, 19, . The end is connected to the ring-shaped oxygen supply passage 16.

Therefore, the ejection passage 1 in each fixed fin 17
9, 19... and the ejection passage 14 of each rotating fin 13,
14 are configured to face each other and blow out oxygen, but since each rotating fin 13 rotates together with the rotating shaft 8, the oxygen from each blowing passage 14 and 19 is evenly and evenly jetted out and collided into one body. The mixture is stirred and mixed.

Reference numeral 20 denotes a joining flange, which is provided to divide and join the casing 15 into a plurality of units, and an oxygen supply pipe 21 is provided in the casing 15 near one end to supply the oxygen having the ring-shaped cross section. The fixing fins 17 are connected to the supply passage 16 of the fixed fins 17 to supply oxygen, and the oxygen is ejected from the ejection passages 19, 19, . . . of the respective fixed fins 17.

Further, 22 is a seal water supply pipe, which is connected to the housing 5 on one side and is designed to prevent the pulp liquid (raw material) inside the housing 5 from coming out to the bearing part and to prevent air from entering. is being used.

Note that, depending on the design, the fixed fins 17 disposed on the inner wall of the casing 15 may be fixed by welding, but may be made replaceable by bolted joints.
It is also possible to make it possible to adjust the size of the stirring clearance 18 relative to the size of the stirring clearance 18.

<Embodiment - Effect> In the above configuration, a bleaching line for pulp liquid (raw material) is operated, and the pulp liquid supplied to the line is supplied from the inlet pipe 2 as shown by the arrow in FIG. 1, and is mixed. In the process of passing through the section 4 and being supplied from the outlet pipe 3 to the next stage, the rotating fins 13, 13, . A stirring action is performed between the fixed fins 17, 17, . As a result, a kind of refining action is performed, and the refining of the pulp fibers is performed while receiving the stirring action.

Thus, in the above operation, the supply pulp 8',
When oxygen at a predetermined concentration is supplied from 21, oxygen is supplied to the internal supply passage of the rotating shaft 8 via a swivel joint (not shown) in the housing 5, and each rotating fin 13
Oxygen is ejected into the flowing pipe liquid from the ejection passages 14, 14, . Fixed fin 1
Oxygen is ejected from the ejection passages 19, 19, . . . 7 to the pipe liquid that also flows.

Thus, the ejection passage 19 of each fixed fin 17,
Oxygen ejected from the ejection passages 14, 14... of each rotating fin 13 rotating as 19... performs a stirring action on the flowing pulp liquid at an average density in the axial direction, and each rotating fin 13 corresponds to When relatively passing through the fixed fins 17, oxygen is injected from both the inside and outside of the pulp liquid that is vigorously flowing in the stirring clearance 18 between the two, thus ensuring a reliable bleaching effect.

In this way, the pulp liquid flowing through the process of a set length, although short, is subjected to the action of aligning the fibers by the refining process as described above, and at the same time is subjected to the bleaching action of oxygen, which leads to the outlet pipe 3.
It is then sent to the next stage of the process.

Thus, each fixed fin 17 in the above embodiment
is fixed to the inner wall of the casing 15, or
It is a replaceable type, and the stirring clearance 18 for each rotating fin 13 is fixed or can be adjusted in stages. As mentioned above, there are cases where it is necessary to change the mode of bleaching due to the design, but the fixed type or stepped adjustable type cannot necessarily handle highly accurate adjustment. As shown in the figure, the spout 23 for each fixed fin 17 provided on the inner wall of the ring-shaped passage 16 of the casing 15 is formed into a long rectangular shape, and each fixed fin 17 is attached in the axial direction via a long groove bolt mechanism, also not shown. By adjusting steplessly, the ejection passage 19 can maintain communication with the long groove 23 and change the size of the stirring clearance 18 formed by both of the rotary fins 13.

Of course, in this embodiment, each rotating fin 13
It is also possible to make stepwise or stepless adjustment of the stirring clearance 18 by making the fins replaceable or sliding in the axial direction.
It is possible to adjust the stirring clearance 18 by making both of the stirring clearances 18 adjustable in axial direction.

Note that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments; for example, a screw or propeller may be provided at the rear of the rotating shaft, a temperature sensor, a whiteness detection sensor, etc. may be provided. Various aspects can be adopted.

Further, the present invention can be applied not only to the above-mentioned pulp liquid bleaching line but also to other gas-liquid stirring chemical plants.

In addition, as a design change, one or both of the inlet pipe 2 and the outlet pipe 3 can be crossed at an appropriate angle with respect to the mixing part 4 to achieve freedom of connection. 15
It is also possible to change the predetermined length of each unit via the tightening flange 20 according to the design.

It is also possible to change the amount of oxygen supplied to the oxygen passage in the rotating shaft using a swivel joint valve.

<Effects of the Invention> As described above, according to the invention of this application, in basically an in-line type stirring device, the material to be treated is allowed to flow from the inlet pipe to the outlet pipe while being mixed with other fluids, such as oxygen, etc. It has the effect of uniformly stirring and mixing, and the fixed fins provided on the casing and the rotating fins provided on the rotating shaft enable a vigorous zigzag stirring process to further promote mixing and stirring efficiency. The effect of being able to do this is produced.

In addition, a plurality of fixed fins provided on the casing and a plurality of rotating fins on the rotating shaft are each arranged in the axial direction, and the axial mounting position of one or both of them can be corrected in a stepwise or stepless manner. By doing so, the agitation clearance between the two is adjusted, and as a result, the agitation action in the mixing section is subtly adjusted, and the agitation action is subtly changed depending on the condition of the processed material flowing through the line. In addition to having a degree of freedom in design that can accommodate
An excellent effect is achieved in that there is a degree of freedom in operation.

By forming an ejection passage connected to another fluid passage in either the fixed fin or the rotating fin, it is possible to achieve the effect of uniform mixing in the axial direction during the stirring process, and Since other fluids such as oxygen are ejected in a direction crossing the directional flow direction, an excellent effect is achieved in that a short stirring process efficiency can be obtained.

Furthermore, depending on the type of pulp liquid, etc., a refining effect on fibers etc. can be obtained during the flow, and it is performed at the same time as stirring, making it possible to omit separate steps and saving space in the facility. Effective utilization can be achieved, the plant structure can be simplified, equipment investment can be reduced, and costs can be reduced.

Also, by using an in-line type like this, the horsepower is less, which reduces running costs.
Furthermore, since the structure is simple, maintenance, inspection, etc. are easy, and durability is also improved.

In addition, since the rotating shaft is provided with rotating fins in contrast to the fixed fins, the radial size can be reduced, which reduces vibration during operation, improves durability, and helps reduce noise in the working environment.

Furthermore, the lengthwise size can be changed as appropriate, and the connection between the inlet pipe and the outlet pipe can also be changed, so there is an effect that there is a high degree of freedom in design.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of embodiments of the invention of this application, and FIG. 1 is a schematic partial cross-sectional view of the entire embodiment, FIG. 2 is a partial vertical cross-sectional view of fixed fins and rotary fins in opposed positions, and FIG. 4 is a cross-sectional view of the casing, the fixed fin, and the rotating fin, and FIG. 4 is a longitudinal cross-sectional view of the fixed fin of another embodiment. 2... Inlet pipe, 3... Outlet pipe, 15... Casing, 8... Rotating shift, 17... Fixed fin, 13... Rotating fin,
1... Stirring device, 14, 19... Ejection passage.

Claims (1)

[Scope of Claims] 1. In an in-line type stirring device that is interposed between an inlet pipe and an outlet pipe and is provided with fixed fins and rotating fins on the inner surface of the casing and on the rotating shaft, each of the fixed fins A stirring device characterized in that at least one of the rotating fins is formed into a plurality of fins in the axial direction, and further, the mounting position in the axial direction of the plurality of fins is adjustable. 2. In an in-line type stirring device that is interposed between an inlet pipe and an outlet pipe and has fixed fins and rotating fins on the inner surface of the casing and on the rotating shaft, at least one of the fixed fins and rotating fins is provided. One of the fins has a plurality of fins in the axial direction, and the mounting position of the plurality of fins in the axial direction can be freely adjusted, and at least one of the fixed fin and the rotating fin intersects in the longitudinal direction and has a jet passage inside. A stirring device characterized in that the stirring device is formed with a base portion connected to a fluid passage.