JPH0487647A - Method and device for classifying and separating slurry - Google Patents

Abstract

PURPOSE:To stably classify and separate a slurry by providing plural hydrocyclones in parallel, connecting the tip of each overflow pipe to one hydro- sealed hydro-pipe and controlling the negative pressure of the hydro-pipe. CONSTITUTION:A negative pressure meter 18 and an emergency air feeder 20 are set at a specified value, and a raw slurry 5 is supplied to each hydrocyclone 1 from a slurry tank 4. A specified siphonic pressure acts on each overflow pipe 6', the slurry is classified and separated in each hydrocyclone 1, the fine-grain component is discharged to a slurry overflow tank 8 from the pipe 6' by the centrifugal force, and the concd. coarse grains are discharged from an underflow spigot 10 and a check valve 11. When the amt. and pressure of the raw slurry 5 supplied are varied, the air feeder 19 is controlled by a controller 17 through the negative pressure meter 18, and the negative pressure in the pipe 6' is kept constant. When the slurry supply pressure, etc., are suddenly changed, the emergency air feeder 20 functions as a negative pressure breaker.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of processing slurry such as factory wastewater and muddy water in construction sites.

<Summary of the gist> The invention of this application, when classifying and separating slurry such as factory wastewater or muddy water used for muddy water shielding work in the construction industry into a predetermined particle size distribution, feeds the slurry to a hydrocyclone and collects the overflow. In slurry classification and separation, the tip of the overflow pipe is hydro-sealed to the slurry overflow tank to create a predetermined negative pressure state, and the underflow is separated to a predetermined concentration via a check valve using an underflow spigot. This invention relates to a slurry classification and separation method in which the negative pressure of the overflow pipe is controlled by air inflow to adjust the classification point, and an apparatus directly used in the method, and in particular, the invention relates to a device that is directly used in the method, and in particular, the invention relates to three hydrocyclones as described above, Multiple units such as 4 units are installed together, and each overflow pipe is connected to one hydro pipe via a negative pressure siphon pipe, and the tip of the hydro pipe is hydro-sealed facing the slurry overflow tank. This invention relates to a slurry classification and separation method and apparatus in which the classification point is adjusted by controlling the negative pressure by injecting air into the hydro pipe and raising and lowering the pipe.

<Conventional technology> As is well known, modern society is supported by highly developed industrial technology, and chemical and mechanical equipment technology is the core technology of many industrial technologies, and among these, separation technology is an indispensable technology in various fields. It is extremely widely used, for example, not only in the chemical industry, pharmaceutical industry, food industry, etc., but also recently as a pollution prevention technology, it is used in factories to treat liquids, and in the construction industry to remove silt, such as in muddy water shielding work. It is also highly used for classification and separation.

As a basic technology, solid-liquid separation means are often used as subsystems of flow systems, and in particular, hydrocyclones are used as an extremely important means.

However, in the conventional technology, hydrocyclones are operated under the conditions of constant feed pressure and constant overflow pressure of the slurry stock solution, which results in a lack of operational flexibility since the classification point 2 separation point is always constant. There are disadvantages, and there is also the disadvantage that there is a lack of flexibility, and it is difficult to carry out optimal transport for specific gravity and concentration/particle size distribution, which vary depending on the type and properties of the slurry to be fed and processed.

Therefore, there was also a negative point that it was not possible to perform optimal system control of the plant.

Since sludge with a predetermined concentration is discharged from the underflow spigot, a secondary separation device must be attached to the underflow spigot, which complicates the plant equipment and increases the initial cost. However, there was a disadvantage that running costs were high, and there was also the problem that management and control were carried out at the top of the furnace.

<Problem to be solved by the invention> In order to solve this problem, for example, as shown in the invention of Japanese Patent Publication No. 31-10898, the overflow pipe is made into an overhang type siphon pipe, and its tip is hydro-sealed to prevent slurry overflow. A technology has also been developed that controls the head by moving the overflow pipe connected to the tank up and down, but it has the disadvantage of increasing operating costs, and has the disadvantage of being difficult to seal and manage. .

Therefore, the applicant's earlier invention, for example,
As shown in the invention disclosed in Japanese Patent No. 23670, an overflow pipe of a hydrocyclone is sealed to a hydropipe, the hydropipe is hydrosealed to a slurry overflow tank, and the hydropipe is integrated with the slurry overflow tank. There is also a technology that maintains the classification separation point constant by controlling the negative pressure in the overflow pipe by raising and lowering the pressure, and as also shown in the invention disclosed in Japanese Patent Publication No. 57-11707, Developed a technology in which the cyclone overflow pipe is an overhang type negative pressure siphon pipe, and a negative pressure regulator is installed at the top of the pipe, and an air inflow regulating valve is installed to selectively control the classification separation point. It has contributed greatly to the treatment of factory waste liquids and the construction of muddy water shields in the construction industry.

That is, as shown in FIG. 5, a slurry supply pipe 2 provided tangentially to the hydrocyclone 1 is connected to the slurry pump
The overflow vibro, which has its tip facing the slurry tank 4 via a strainer to supply the slurry stock solution 5, and whose base end is connected to the upper center of the hydrocyclone 1, is used as an overhang type negative pressure siphon. An air inflow regulating valve 7 that can freely adjust the flow rate is provided at the top, and its tip faces the wall surface of the overflow slurry 9 of the slurry overflow tank 8 for hydro-sealing.
A fishtail type check valve 11 is provided on the underflow spigot of the underflow pipe 10 at the lower center of the hydrocyclone 1, and the coarse sludge 13 discharged into the check valve 11 and separated from the pipe is discharged into the check valve 11. is discharged into a sludge receiver 12.

As shown in FIG. 6, the slurry supply cyclone 2 of the hydrocyclone 1 is connected to a slurry pump 3 to supply the slurry stock solution 5 from the slurry tank 4 through the strainer, and the overflow vibro is under negative pressure as described above. The liquid is placed at the base end of the hydro-pipe 14, which is hydro-sealed with its tip facing the overflow slurry 9 of the overflow slurry tank 8, which is an overhang type siphon pipe and is installed at a predetermined level below the sludge receiver 12. The hydropipe 14 is connected to the motor 16 of the lifting device by, for example, a rack and pinion mechanism 15, and the overflow slurry tank 8 and the hydropipe 14 are integrated through a honeycomb bracket. As a result, the hydropipe 14 and the overflow slurry tank 8 are integrally movable up and down in a predetermined manner, and the negative pressure of the overflow vibro is adjusted and controlled.

In either of the embodiments shown in FIGS. 5 and 6, as shown in FIG. As mentioned above, when performing classification and separation processing of factory waste liquid and muddy water shield, there are various factors such as manufacturing errors and assembly errors of each hydrocyclone 1, specific gravity of slurry stock solution, 21°2 particle size distribution, supply pressure, etc. Due to various differences, the negative pressure of the overflow vibro can be adjusted by adjusting the lifting amount of the air inflow regulating valves 7.7.7... and the hide port pipes 14.14.14... via a predetermined control device 17. I had to adjust.

However, in the technology using a hydrocyclone that adjusts and controls the negative pressure of the negative pressure sift pipe of the overflow pipe in the conventional manner, there are manufacturing errors in the two assembly of each hydrocyclone, and , Due to subtle differences in control management technology during operation, the type of slurry, specific gravity,! ! It is impossible to assume that the classification separation point of each hydrocyclone is the same due to differences in operating conditions due to various changes such as particle size distribution.
Therefore, when operating multiple hydrocyclones in one plant, the functions of each hydrocyclone are different, making it impossible to adjust the total classification separation point in a stable manner. It is necessary to adjust the individual classification and separation points of the hydrocyclone, and as a result, the operation is extremely close to the top of the furnace, requiring skill in control management, maintenance, inspection, etc., and the resulting (particle size distribution of the resulting slurry) However, the reliability of the resulting slurry cannot be obtained due to instability, which has the disadvantage of requiring a long operation period and potentially increasing costs.

Moreover, the fact that the control circuits for each hydrocyclone are complicated is a drawback in terms of both equipment and cost.

<Objective of the Invention> The object of the invention of this application is to solve the problems of classifying and separating slurry using a plurality of hydrocyclones based on the above-mentioned prior art, and to Although we assume that there are differences in the applicable conditions due to manufacturing errors, assembly errors, and variations in the slurry's specific gravity 1m2 particle size distribution, etc.,
The purpose of the present invention is to provide excellent slurry classification and separation and equipment that will benefit the field of chemical machinery equipment technology utilization in various industries by ensuring that the classification and separation of slurry in a total plant can always be under constant and stable operating conditions. .

<Means/effects for solving the problem> In accordance with the above-mentioned object, the structure of the invention of this application, which has the gist of the above-mentioned claims, is to solve the above-mentioned problem by providing two steps in at least one slurry processing plant. When a predetermined number of hydrocyclones such as 4 hydrocyclones are installed and the slurry is classified and separated in simultaneous operation, for example, slurry for factory waste liquid or muddy water shielding is supplied from one slurry tank to each hydrocyclone, In order to classify and separate overflow and underflow through centrifugal separation using rotating motion, the overflow pipe of each hydrocyclone is made into an overhang type negative pressure siphon, and all the tips are assembled into one hydropipe. The hydropipe is hydro-sealed facing the slurry overflow tank, and a predetermined negative pressure is created in the overflow pipe so that at a predetermined classification separation point, the fine particles are overflowed and the coarse particles are underflowed. The overflow is discharged to the slurry overflow tank via the overflow pipe and hydro pipe, and
The underflow is discharged and stored in the underflow receiver via an underflow spigot using a check valve such as a fish tellurium type, and is transferred from one slurry tank to one slurry overflow tank and sludge receiver using multiple hydrocyclones. As mentioned above, even if each hydrocyclone has manufacturing errors, assembly errors, and changes in the specific gravity, concentration, and particle size distribution of the slurry to be treated, A small amount of air is inflowed from the air inflow adjustment valve of the hydropipe so that the overflow pipe reaches the set negative pressure by the negative pressure meter installed in the hydrocyclone, and the classification separation point of each hydrocyclone is automatically kept constant. In addition, if the properties of the negative pressure change, the air inflow amount should be adjusted and controlled to a predetermined value, and if the negative pressure in the overflow pipe suddenly changes or the specific gravity of the slurry changes! ! Every time.

If there is a sudden change in particle size distribution, etc., an emergency air inflow device such as a negative pressure breaker will be activated to allow a large amount of air to flow in to prevent blockage of the overflow spigot or stoppage of the hydrocyclone function. In addition, even in such a case, make sure that the head of the overflow pipe from the hydropipe to the hydrocyclone is kept alive so that the negative pressure does not drop to zero and spray, or that the hydropipe is connected to the slurry overflow. The entire tank is moved up and down in a specified manner via a mechanical lifting mechanism to adjust and control the negative pressure in the overflow pipe to adjust the classification separation point in the same way as described above, and multiple hydrocyclones are installed. This method also takes technical measures to enable classification and separation processing of slurry that is stable in terms of the total system.

<Embodiments> Next, embodiments of the invention of this application will be described below with reference to FIGS. 1 to 4. Note that the same parts as in FIGS. 5 to 7 will be described using the same reference numerals.

The embodiment shown in FIGS. 1 to 3 is a control mode for adjusting the siphon negative pressure by air flowing into the overflow pipe, and in this embodiment, three well-known hydrocyclones 1° 1.1 are installed in the plant. Slurry supply pipes 2, which are installed at a predetermined location and connected to each other in the upper tangential direction, each have a slurry pump 3, and a strainer is provided to one slurry tank 4 for storing, for example, factory waste liquid or muddy water from a muddy water shield in construction work. The slurry stock solution 5 is supplied through the connection.

Therefore, in any hydrocyclone 1, 1
Since the same slurry stock solution 5 is supplied to two slurry tanks 4, once set, the slurry properties such as specific gravity and particle size distribution of the same slurry stock solution 5 are the same,
The supply pressure is also kept the same (of course, the properties of each may vary).

The overflow vibro', which is connected with its base end facing the upper center of each hydrocyclone 1, is an overhang type and is formed into a negative pressure siphon pipe, and its tips are all gathered together to form a single pipe. The hydropipe 14' is connected in a sealed manner to the hydropipe 14', and the hydropipe 14' is further connected to the hydropipe 14'.
The tip of the hydro connection pipe 141 faces the slurry overflow tank 8 and is hydro-sealed to discharge the fine overflow slurry 9.
The clear water is discharged to an overflow weir.

A predetermined well-known negative pressure meter 18 faces the hydropipe 14' and is electrically connected to a predetermined computer-incorporated control device 17'. A port 19' of an air inlet device @19 having an electromagnetic restrictor 21 as shown in FIG.

Further, an emergency air inlet device 20 as shown in FIG. 3 is connected to the hydro pipe 14', and a bypass passage 22 is provided in the pipe to allow the valve body 23 to supply emergency air to the hydro pipe 14'. A pressure spring 24 (a spring receiver 25 for the valve body 23 which can freely slide) is connected to a suitable gear machine to allow inflow.
The valve body 23 is movable forward and backward, so that the negative pressure breaker function of the valve body 23 can be adjusted as appropriate.

In the above configuration, the negative pressure meter 18 of the hydropipe 14' is set to, for example, 50 rttmH prior to plant operation.
p, and the negative pressure breaker function of the elastic spring 24 of the emergency air inflow device 20 is activated by the gear mechanism 26, for example, 90.p. Hg and adjust the spring receiver 25, and the slurry stock solution 5 is supplied from the slurry tank 4 to each hydrocyclone 1 by the slurry pump 3 at a predetermined supply pressure.

Therefore, a predetermined siphon negative pressure acts on each overflow vibro', and in each hydrocyclone 1, predetermined classification separation is performed at the slurry classification separation point, and fine particles are passed through the overflow vibro' by centrifugal action. The overflow slurry 9 is discharged from the hydro pipe 14' 141 to the slurry overflow tank 8, while the highly concentrated coarse particles descend as an underflow, and the fishtail type check valve is closed at the under-70 subgot 10. When the balance between force, atmospheric pressure, and accumulated weight is broken, the check valve 11 is opened and the sludge receiver 12 is removed.
Then, the slurry is discharged as sludge 13, and a predetermined classification and separation of the slurry is carried out.

During this time, if the supply amount or supply pressure of the slurry stock solution 5 varies due to the type and property of the slurry, manufacturing error 2 assembly error of the hydrocyclone 1, etc., the hydro pipe 1
Since the negative pressure meter 18 connected to the au device 17 is initially set to have the same negative pressure setting for all the hydrocyclones 1, variations in the negative pressure that occur during operation are controlled. ' The air inlet device 19 is automatically controlled by
The aperture 21 is automatically adjusted to continue the inflow of a predetermined minute amount of air, and the negative pressure in each overflow vibro' is controlled to a constant negative pressure so that a constant classification separation is maintained.

Therefore, hydrocyclones 1, 1, 1. Although three hydrocyclones are installed, the classification separation point is maintained constant in each hydrocyclone 1, and overflow slurry and sludge with the same particle size distribution are obtained.

During this period, if the slurry supply pressure suddenly changes unexpectedly, the negative pressure in the overflow vibro' will change, and if the throttle 21 of the air inlet device 19 is not automatically controlled by the negative pressure meter 18, In this case, the valve body 23 of the classified air inlet device 20 operates and functions as a negative pressure breaker, causing a large amount of air to flow in through the bypass passage 22 and causing blockage of the throttle 21. The overflow vibro' connected to the upper part of the hydro pipe 14' has, for example, 760 trtmH.
(Since the head such as J is effective, the negative pressure does not become O, the spray phenomenon can be avoided, and predetermined countermeasures can be taken.

Next, in the embodiment shown in FIG. 4, the negative pressure in the overflow pipe due to air inflow is controlled mechanically, whereas in the above embodiment, the negative pressure is controlled mechanically.
In terms of response controllability, immediate response is low, but control characteristics within an acceptable range can be obtained.

That is, as in the above-described embodiment, the overflow vibro' of the overhang type negative pressure siphon pipe of the three hydrocyclones 1 and 1.1 installed together is centrally connected to the hydropipe 14' via the header 27. A negative pressure meter 18 and an emergency air inlet device 20 are connected.

Thus, the connecting hydropipe 141 is slidably inserted into the hydropipe 141 in a sealed state,
A ball screw 28 is integrally inserted into the connecting hydropipe 141, and the connecting hydropipe 14' is integrally connected to the slurry overflow tank 8 via a bracket.

A worm gear 29 is screwed onto the ball screw 28, and linked via a bevel gear mechanism 30 to a motor 16' which is electrically connected to a control unit 17'.

In this embodiment, when carrying out the classification and separation treatment of the predetermined slurry stock solution 13 fed in the same manner as in the above-mentioned embodiment, the processing is performed under a predetermined negative pressure of the overflow vibro', and minute fluctuations in the negative pressure are avoided. is detected by the negative pressure meter 18, the motor 16' is operated via the control device 17', and the bevel gear mechanism 30 operates the worm gear 29 against the ball screw 28 to slide the connected hydropipe 14' into the hydropipe 14' by a predetermined amount. By doing so, the siphon negative pressure of the overflow vibro' is adjusted, the set classification separation point is maintained, and the supplied slurry is prevented from clogging the check valve 11 in the underflow spigot 10. Even if there are some fluctuations in the type, specific gravity, 18 degrees, supply pressure, etc., the hydrocyclone 1 can be operated flexibly by adjusting the classification separation point.

In this embodiment as well, when the properties of the slurry stock solution 13 suddenly change, the emergency air inflow device 20 similar to the above-mentioned embodiment is activated and the negative pressure breaker function is activated, resulting in the same substantial effect as in the above-mentioned embodiment. The effect will be Qin.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments; for example, the emergency air inlet device may be of various electrical type in addition to mechanical type. be.

Moreover, it goes without saying that the slurry to which the present invention can be applied can be applied to various other applications other than factory waste liquid and slurry for muddy water shielding in the construction industry.

<Effects of the Invention> As described above, according to the invention of this application, basically, when performing classification separation of slurry such as factory waste liquid or muddy water shield using a hydrocyclone, a predetermined number of plural hydrocyclones are installed in one plant. In conducting operations,
Each hydrocyclone has individual manufacturing errors and assembly errors,
Or, the specific gravity of the slurry to be fed, the concentration 1 particle size distribution,
Furthermore, even if the supply pressure changes due to changes in the supply pressure conditions, the negative pressure in the overflow pipe can maintain the classification separation points of all hydrocyclones at a specified level or adjust them to the optimum state, making it possible to operate as a total system. An excellent effect is achieved in that the operation of the classified portion 11i can be performed stably.

In addition, since there is no need to individually adjust the negative pressure of the overflow pipe of each hydrocyclone, operational efficiency is high, and maintenance such as control management or maintenance inspection is not performed at the top of the furnace. When adjusting the drive of the negative pressure of the overflow pipe, each hydrocyclone's overflow pipe is connected to one hydropipe, and a predetermined amount of air is injected in response to the negative pressure detected by the hydropipe, thereby manufacturing individual hydrocyclones. error.

Even if the overflow pipe negative pressure fluctuates due to errors or changes in the properties of the supplied slurry, the negative pressure can be automatically adjusted to the set negative pressure, and the hydro pipe can be mechanically adjusted. The negative pressure head can be adjusted by moving it up and down, and even though multiple hydrocyclones are installed, it can be used in the same way as a single hydrocyclone for classification and separation of slurry.

In addition, since a single negative pressure adjustment mechanism can handle a plurality of hydrocyclones, the overall structure of the plant is not particularly complicated and is simple, which has the advantage of being easy to control and manage.

Therefore, the effect that processing of the target slurry is performed with high reliability is also achieved.

[Brief explanation of drawings]

1 to 4 are detailed explanatory diagrams of the invention of this application, in which FIG. 1 is a schematic partial sectional view of an embodiment, FIG. 2 is a sectional view of the air inlet device, and FIG. 3 is a sectional view of the air inlet device. FIG. 4 is a sectional view of the emergency air inflow device; FIG. 5 is a partially cutaway sectional view of another embodiment; FIG.
, 6 is a partial cross-sectional view of a hydrocyclone plant based on the prior art, and FIG. 7 is a schematic side view of the same plant. 11... Underflow spigot 8... Slurry overflow tank 28-30... Rotating device 5... Slurry 1... Hydrocyclone 6.6'... Overflow pipe 10... Underflow pipe 14'...Hydro pipe 19...Air inflow device 20...Emergency air inflow device 1...Hydrocyclone pipe Pipe 5...Slurry 66'...Overflow 10...Underflow 14' ...Hydro pipe 19...Air inflow unit 20...Emergency air inflow device 11...Underflow spigot 8...Slurry overflow tank 28-30...Swivel device

Claims (11)

[Claims] (1) In order to supply the slurry to the hydrocyclone and classify and separate the overflow and underflow, the tip of the overflow pipe is hydro-sealed, and the negative pressure of the overflow pipe is controlled to adjust the classification point. In the slurry classification and separation method, multiple hydrocyclones are installed and each overflow pipe is connected to one hydropipe whose tip is hydrosealed to control the negative pressure of the hydropipe. A slurry classification separation method characterized by: (2) The slurry classification and separation method according to claim 1, wherein the negative pressure in the hydropipe is created by air inflow. (3) The slurry classification and separation method according to claim 2, wherein the air inflow is performed as a large amount of emergency air inflow when the negative pressure of the hydro pipe deviates from the set pressure. (4) The slurry classification and separation method according to claim 2, wherein the amount of air flowing in is adjusted. (5) The slurry classification and separation method according to claim 4, wherein the adjustment of the air inflow amount is automatically performed by detecting negative pressure in a hydropipe. (6) The slurry classification and separation method according to claim 1, wherein the negative pressure in the hydropipe is created by expanding and contracting the hydropipe. (7) The method for classifying and separating slurry according to claim 6, characterized in that the expansion and contraction of the hydropipe is carried out as the overflow tank in which the hydropipe is hydrosealed is raised and lowered. (8) the hydrocyclone connected to the slurry supply pipe has a check valve in its underflow spigot;
In a slurry classification and separation device in which an overflow pipe has a negative pressure adjustment and is hydro-sealed to a slurry overflow tank, a predetermined number of the above hydrocyclones are installed together, and each of the overflow pipes is installed below an underflow spigot. The slurry is connected to a slurry overflow tank with a single hydro pipe whose tip is hydro-sealed, and the single hydro pipe is provided with an air inflow regulating valve for regulating negative pressure. Classification separation equipment. (9) The slurry classification and separation apparatus according to claim 8, characterized in that an emergency air inflow valve is attached to the hydropipe. (10) A slurry classification and separation device in which a hydrocyclone connected to a slurry supply pipe has a check valve on its underflow spigot, and an overflow pipe has negative pressure regulation and is hydrosealed to a slurry overflow tank. A predetermined number of the above-mentioned hydrocyclones are installed together, and each of their overflow pipes is connected to a single hydropipe whose tip is hydrosealed to a slurry overflow tank provided below the underflow spigot. A slurry classification and separation device characterized in that said one hydropipe is provided with a device for advancing and retracting the overflow pipe of said hydropipe. (11) The slurry classification and separation apparatus according to claim 10, wherein the hydropipe is integrally connected to a slurry overflow tank.