JPH01307414A - Slurry spouting filtration device - Google Patents

Abstract

PURPOSE:To carry out a stable continuous filtration for the slurry, etc., contg. hard fine particles by circulating the slurry while spouting the slurry flow against the filter to eliminate the clogging of filter and while filtrating the slurry in a parallel flow filtration system. CONSTITUTION:A chamber 7 provided with a slurry flowing-in opening 2 and a chamber provided with a slurry flowing-out opening 9 are separated by a filter 1. The slurry sent from a slurry tank 4 by a pump 6 is spouted out with high pressure from the slurry flowing-in opening 2 in the chamber 7, and dashed directly against the surface of the filter 1. Unfiltered slurry is returned to the slurry tank 4 from the chamber 7 through a returning flow discharge opening 8, etc. As a result, a stable continuously filtration is allowed to be carried out for various kind of mixed material, such as the slurry contg. hard fine particles or the slurry of high particle concentration.

Description

Detailed Description of the Invention A. Object of the Invention (Field of Industrial Application) The present invention is applicable to fine particles for pigments and paints, raw materials for fine ceramics, electromagnetic materials, fine particles for adding to food materials, fuel for ships,
The present invention relates to a strainer or filtration device that can be applied to various types of slurry such as muddy water.

Some of the above examples of application areas will be explained in more detail. For example, particles with a diameter of 3 to 4 microns or less are mixed into the base film of magnetic tape to improve the tape's slippage, but because the base film is thin, some of the lubricant particles have a diameter larger than the specified size. It becomes a defect.

When mixing pigments into yarn to directly color the yarn, if the particle size of the pigment is too large, lumps may form in the yarn, making it impossible to run it on a loom. In such cases, it is necessary to accurately match the particle size of the pigment mixed into the thread.

Coarse particles in fine ceramic raw materials and particles mixed in from the outside world cause defects after firing, so it is important to remove these unnecessary particles from fine ceramic raw materials.

The present invention relates to a filtration device that filters a slurry serving as a raw material in the above cases so that it contains only particles with a certain diameter or less.

Further, as an example where the dispersion function is particularly utilized, there is reforming of fuel oil. For example, C heavy oil used as marine fuel contains sludge such as catalyst residue and polymeric substances.
The sludge must be removed before it can be used as fuel for diesel engines. However, since the polymeric substances in the sludge can be used as fuel, it is desirable to disperse the sludge and use it as fuel, but the polymeric substances tend to clog filter media. The present invention relates to a filtration device used in such cases, which performs both dispersion and filtration.

(Prior art) Conventionally, as a continuous filtration device, an outer chamber and an inner chamber are separated by a cylindrical filter, and the outer chamber has an inlet and the inner chamber has an outlet. There is a filtration device that operates while destroying a cake layer formed on the surface of the filter using ultrasonic waves.

FIGS. 2 and 3 are a longitudinal sectional view and a transverse sectional view of this ultrasonic filtration device. As shown in FIG. 8, the slurry entering from the inlet 30 is filtered by a filter 31 and exits to the outlet 32. At this time, a cake layer is formed on the surface of the filter 31 due to coarse particles in the slurry.

By applying ultrasonic waves to this cake layer from a horn 34 connected to an ultrasonic vibrator 33, the secondary aggregated coarse particles forming the cake layer are dispersed into fine particles, and the cake layer is removed. Since the filter is rotating, the entire surface of the filter is sequentially cleaned by ultrasonic waves. In order for this device to maintain continuous filtration ability, the dispersion and filtration ability of the ultrasonic waves must exceed the amount of particles to be collected.

In this case, the dispersion and filtration ability are determined by the amplitude of the ultrasonic waves, the shape of the horn, the gap between the tip of the horn and the filter medium, the pressure of the processing liquid, and the rotation speed of the filter, and the amount of collected particles is determined by the particle concentration in the processing liquid. , particle size, and filtration accuracy of the filter.

Although this ultrasonic filtration device has excellent performance, it still has its limitations when the particle concentration in the slurry becomes high.

(Problems to be Solved by the Invention) An object of the present invention is to obtain a filtration device that can perform continuous filtration operation for various mixtures such as slurry containing hard fine particles and slurry with a high particle concentration.

Configuration of the Invention (Means for Solving the Problems) The present invention is a filtration device in which a chamber A provided with a slurry inlet and a chamber B provided with a filtrate outlet are separated by a filter. The slurry is ejected from the inlet into the chamber A under high pressure to disperse coarse particles in the slurry, form a slurry flow on the filter surface, prevent cake formation on the filter surface, and apply this slurry flow to the filter. , while unclogging the filter.
This is a filtration device that performs parallel flow filtration and returns unfiltered slurry from chamber A to a slurry tank.

(effect) The operation of the device of the present invention will be explained based on the drawings.

FIG. 1 is a diagram illustrating the operation of the filtration system device of the present invention. Here, an example will be explained in which a cylindrical filter is used as the filter. The slurry stored in the slurry tank 4 is mixed by a mixer 5. The mixed slurry is pumped to the filtration device by the pump 6. The pressure at this time is such that the slurry spouted into the filtration device can cause a dispersion effect and a cleaning effect on the filter.

The pressurized slurry is ejected from a nozzle 2.3 provided at the tip of the inlet into the filtration device into a chamber 7 (hereinafter referred to as filtration chamber) within the filtration device.

This spouted slurry generates a flow around the filtration chamber 7. The slurry is filtered while flowing parallel to the filter surface, and the filtered liquid moves into a chamber inside the filter and is discharged from the outlet 9. The unfiltered slurry exits through the reflux outlet 8 and is returned to the slurry tank 4.

The filtration speed can be adjusted by the differential pressure between the inside and outside of the filter at this time. This differential pressure can be adjusted by adjusting the valves 10 to 13.Furthermore, it is also possible to use the valves as automatic valves and adjust opening and closing by microcomputer control.

Since the surface of the filter 1 is constantly exposed to the flow of slurry, a cake layer is not formed on the filter surface as in conventional filtration devices. Therefore, continuous operation for a long time is possible. Furthermore, even if the filter 1 becomes clogged, it can be resolved by reducing the differential pressure between the inside and outside of the filter to zero. For example, if the valve 10 is closed, the differential pressure becomes zero.

When the slurry flow blows out from the nozzle, a shearing force acts on the particles in the slurry due to a sudden change in velocity.
The particles are dispersed. In addition, the high speed slurry flow ejected from the nozzle causes a capitation phenomenon, which also promotes the dispersion of particles in the slurry. In this way, the slurry flow ejected from the nozzle creates a flow within the filtration chamber 7, and also has a strong dispersion effect on the particles contained in the slurry.

In the filtration device of the present invention, the slurry is circulated in the filtration chamber, but by providing the reflux outlet 8 in the direction along the flow of the slurry circulating in the filtration chamber 7, the effect as a hydrocyclone can be achieved. Among the particles contained in the slurry, coarse particles return more often (as a result,
Since the coarse particles have more opportunities to be dispersed, the dispersion effect of the slurry as a whole is further improved.

Further, although two nozzles are arranged in the figure, the number is not necessarily limited to this number, and the number may be set as appropriate depending on the size of the apparatus, the viscosity of the slurry, etc.

As shown in FIG. 4, when a slurry jet ejected from the nozzle 2 is applied to the surface of the filter 1, particles clogging the filter can be blown away and removed. If the filter 1 has a rotating mechanism, the clogged filter surface is exposed to the slurry flow jetted from the nozzles one after another and is cleaned. This cleaning effect is more effective as the slurry jet is applied at a deeper angle to the filter surface, but this may cause damage to the filter surface, so in practice it is recommended to apply the slurry jet at an angle within 30 degrees inward from the tangential direction of the filter. Setting the nozzle angle gives good results. When the slurry flow ejected from the nozzle is applied to the filter surface as in the present invention, if the filter is rotating, the entire surface of the filter can be cleaned and the life of the filter will be extended.

(Example) Hereinafter, an apparatus according to an example of the present invention will be described based on the drawings. FIG. 5 is a perspective view showing the appearance of an apparatus according to an embodiment of the present invention. In this device, the slurry reflux outlet is provided at the top of the filtration chamber.

The inflow slurry is supplied from the left side of the filtration chamber.

The rotation speeds of the pump and filter are adjusted using the front operation panel 14. The pressure applied to the slurry is set appropriately depending on the type of slurry, but it is at least 10 kgr.
Pressures of zc- or higher are generally required.

FIG. 6 is a perspective view of another embodiment of the apparatus in which the reflux outlet is arranged along the flow direction.

FIG. 7 is a cross-sectional view of the filtration mechanism. Housing 15
A cylindrical stainless steel (StJS304) filter 16 is rotatably arranged inside. The nozzle 17 was arranged so that the injection direction of the slurry jet was approximately 15 degrees inward from the tangential direction of the filter.

A reflux outlet 26 is provided at the top of the filtration chamber 18, and a drain port 27 is provided at the bottom. The drain port 27 is closed during filtration operation. The slurry is filtered through filter 16 and exits through outlet 25. Unfiltered slurry is returned to the slurry tank through reflux outlet 26.

FIG. 8 and FIG. 9 are examples of a filtration device in which the reflux outlet is arranged in the direction along the flow.

When the reflux outlet is oriented in this manner, the slurry flowing outside the filtration chamber easily flows into the reflux outlet.

FIG. 10 is a longitudinal sectional view of the filtration mechanism. The filtration chamber 18 is surrounded by a housing, a lid part 19, etc., and is surrounded by O-rings 20 to 2.
3, it has a sealed structure.

A part of the filter supported by the bearing ring part 24 has a mechanism that allows it to be rotated while maintaining its closed rod state. The liquid that has passed through the filter 16 exits through the outlet 25.

Although the embodiment using a cylindrical filter has been described above, the present invention can be used not only for cylindrical filters but also for filters of other shapes. FIG. 11 shows an apparatus according to another embodiment of the present invention using a disk-shaped filter. The disk-shaped filter 41 receives a cleaning action, similar to the case of the cylindrical filter described above, by a slurry flow jetted into the filtration chamber 43 from the nozzle 42 of the slurry outlet which is arranged at an angle. The slurry flow flows parallel to the disk surface, and filtration is performed in parallel flow as in the case of a cylindrical filter. The filtered liquid passes through the space inside the disk and is discharged from the outlet 44.

Although the slurry reflux outlet is not clearly shown in this figure,
As with the case of a cylindrical filter, it is efficient if it is placed in the direction of the slurry flow.

Effects of the Invention The filtration device of the present invention circulates the slurry while filtering it using a parallel flow filtration method, and in the circulation process, aggregates in the slurry are dispersed, so that the sludge that remains unfiltered in the end is removed. can be reduced. Furthermore, since sludge does not accumulate in the filtration chamber, stable continuous operation is possible over a long period of time.

The slurry flow ejected from the nozzle creates a strong flow on the filter surface, so a cake layer does not grow on the filter surface. Furthermore, since this slurry flow has a dispersing effect and a filter cleaning effect, continuous filtration operation is possible for a wide range of slurries.

[Brief explanation of the drawing]

Fig. 1 is a system diagram explaining the operation of the device of the present invention, Figs. 2 and 3 are explanatory diagrams of a conventional ultrasonic filtration device, and Fig. 4 is a system diagram for explaining the operation of the device of the present invention. 5 is an external view of the device according to the embodiment of the present invention, FIG. 6 is an external view of the device according to another embodiment of the present invention, and FIGS. 7 to 9 are diagrams of the embodiment Fig. 10 is a cross-sectional view of the filtration mechanism of the device; Fig. 11 is a longitudinal sectional view of the filtration mechanism;
The figure is a sectional view of a device according to another embodiment of the invention. 1.16.41...Filter, 2.3.17...
Nozzle, 4... Slurry tank, 5... Mixer,
6... Pump, 7.18... Filtration chamber, 8.26...
- Reflux outlet, 9.25.4G...outlet, 10-1
3...Valve, 14...Operation panel, 15...Housing, 19...Lid part, 20-23...0 ring, 24...Bearing part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 Figure 8 Figure 10

Claims (3)

[Claims] (1) In a filtration device in which a chamber provided with a slurry inlet and a chamber provided with a filtrate outlet are separated by a filter, slurry sent from a slurry tank is passed from the slurry inlet to the inlet at high pressure. Slurry injection filtration characterized by comprising: means for injecting the slurry into a chamber provided therein to directly hit the filter surface; and means for circulating unfiltered slurry from the chamber provided with the slurry inlet to the slurry tank. Device. (2) As a means for refluxing the unfiltered slurry from the chamber in which the slurry inlet is provided, a reflux outlet is provided in the outside portion of the chamber in a direction along the flow. Slurry injection filtration equipment. (3) The slurry injection filtration device according to Claims 1 and 2, wherein the nozzle is oriented inwardly at an angle of 30 degrees from the tangential direction of the surface of the filter.