JPS63236508A - Structure of ceramic filter - Google Patents

Abstract

PURPOSE:To filter a large volume, make the replacement of a module during assembly and operation easier and also regenerate a filter more easily by mounting an optional module removably on the tube plate section of device. CONSTITUTION:A required number of modules 4, each consisting integratedly of a unit of several tens to several hundreds of filters 1 constituted of ceramic cylindrical porous materials having comparatively small bores, outer diameters of which are several to several ten millimeters, a tube plate also used for a fitting and a protecting tube 3, are mounted on a tube plate 5 of a filter removably by means of, for example, screws of flange structure. As a result, filtering of a large volume can be carried out and replacement of a module during assembly and operation and also regeneration of a filter 1 can be carried out easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a cylindrical ceramic filter for trapping and removing suspended particulates contained in a fluid, particularly a high temperature or high pressure liquid.

[Conventional technology]

Ceramic filters generally have the following characteristics.

(1) It has extremely excellent corrosion resistance against all types of corrosive substances.

(2) It has high heat resistance and can be used at high temperatures without being thermally deformed, softened, or oxidized.

(3) A filter with a uniform pore distribution and any pore size can be produced depending on the particle size of the ceramic powder used as a raw material, molding conditions, firing conditions, etc.

14) @No output occurs and there is no enemy contamination.

Taking advantage of these characteristics, it is used not only in the chemical industry but also in food,
It is widely used in fields such as medicine, metal industry, and radioactive waste treatment.

Most of the elements constituting conventional ceramic filters have a cylindrical structure as shown in Figure 4 with reference numeral 1, and it is common to use multiple elements as a unit. Met.

However, in the case of a cylindrical element, the only effective filtration surface is the fluid inflow 91L, that is, either the inner surface or the outer surface of the cylinder, and since the material is weak in terms of strength, damage may occur during assembly. Due to these problems, there were limitations on the size and number of elements that could be used. In other words, the dimensions of the elements of ceramic filters that have been put into practical use are around 1000 m in length and around 10 m2 in outer diameter. This is the limit, and if a larger filtration area is required, the only option is to install a plurality of units in parallel, each incorporating a large number of cylindrical membranes, as shown in FIG.

In this case, the larger the number of units, the more complicated the operations such as distributing the flow lids became, and it was practically difficult to pass large volumes.

[Problem that the invention seeks to solve]

When installing a large-capacity filtration device, if you try to incorporate cylindrical ceramic filters into one device, you will end up with a unit that includes, for example, several thousand ceramic filters, and if one breaks, its operation will be disrupted. It becomes possible. Furthermore, high-temperature treatment, pickling treatment, etc. for filter regeneration were also difficult.

[Means for solving problems]

The present invention has been made in view of the above-mentioned conventional problems, and
In a ceramic filter that filters and collects dust by attaching a number of cylindrical porous ceramic bodies with one end closed to a tube plate and allowing fluid to flow from the outer surface of the cylindrical porous ceramic body toward the inside, the outer diameter of the ceramic filter is several. One module is a combination of several to several hundred ceramic cylindrical porous bodies with relatively small diameters ranging from millimeters to several tens of millimeters, and any module can be attached to the tube plate of the device using screws or flanges. This is a removable ceramic filter, and a protective tube is attached to the outside of the cylindrical ceramic tube group of the module so as to cover the entire ceramic tube group.

Figure m1 shows an outline of the module of the present invention.

In FIG. 1, 1 is a filter made of a cylindrical ceramic porous body, and 2 is a tube plate/fitting for attaching the filter, which can be attached to a p-tube plate 5 with screws or a 7-lunge structure (not shown). There is.

The ceramic filter 1 and the tube plate/fitting 2 can be joined using an adhesive or a conventionally known method for joining dissimilar materials such as ceramics and metals. The tube plate/fitting 2 may be made of ceramics. 3 is a protective tube for preserving the group of ceramic tubes.0 The module 4 is a combination of the ceramic filter 1, the tube plate/fitting 2, and the protective tube 3. As shown in the figure, the required number of modules 4 are attached to the tube plate 5 of the filtration device 6.0 Figure 3 is a diagram showing an embodiment in which the ceramic filter 1 in Figure 1 is made thinner or longer. I'll go.

In Fig. 3, reference numeral 7 denotes an umbrella-shaped plate with a hole that allows the tubes of the tube group of the ceramic filter 1 to follow the X direction, and the hole allows expansion and contraction due to the difference in thermal expansion between the filter 1 and the protective tube 3'. There is a slight gap to allow the umbrella-shaped plate to
This becomes effective when a fragile ceramic filter becomes too thin or long, and the cantilevered structure reaches its strength limit.

In other words, since it has a double-sided structure, it is possible to have a length about four times as long with the same diameter compared to the cantilever structure. Incidentally, a plurality of the umbrella-shaped plates 7 may be attached or may have a perforated plate structure.

At least when the umbrella-shaped plate 7 is provided, the protection tube 3 is provided with a plurality of openings 8 for fluid entry and exit, so that the entire filtration surface of the ceramic filter 1 functions sufficiently effectively. At the same time, it also functions as a passage for discharging floating particles separated from the surface of the ceramic filter 1 during backwashing to the outside of the system.

The umbrella-shaped plate 7 is preferably conical in order to facilitate the discharge of the suspended particles during backwashing, but it may also be mirror-shaped or an inclined plate. By using
Even if the conventionally used cylinder is used as an element, a sufficiently large filtration area can be secured, and the device can be integrated into one unit, so there is no need to install multiple units in parallel as in the past, and flow distribution etc. There is no need to operate the system, and large-capacity filtration is possible.

In addition, even if there is a problem such as damage to the ceramics during assembly or operation, it can be easily replaced with a spare module, and the ceramic filter can also be regenerated if regeneration by backwashing becomes difficult. By replacing the module with a spare module and continuing operation, the module can be regenerated over a sufficient period of time by high-temperature treatment at a separate regeneration factory or ultrasonic cleaning in hydrochloric acid or hydrofluoric acid.

The ceramic filter element is preferably a porous body mainly made of one or more selected from silicon carbide, cane nitride, alumina, zirconia, magnesia, sialon, cordierite, mullite, and titanium oxide.

This is because these materials have excellent corrosion resistance and high mechanical strength.

Among these, β-3 is particularly suitable for strength and thermal shock resistance.
iC is like Nozomi.

〔Example〕

As an example, a large volume of suspension of 400 m'/h is
In this case, if the dimensions of the filter element shown in FIG. 4 are an outer diameter of 10 mm, an inner diameter of 8 m, and a long length of 1200+sm (effective length of 1170+m), the filtration area of one element is α01tX1.17=CLO567m''.

Then, the protective tube 5 of the module 4 shown in FIG.
When used as a pipe, the screw of the module is PT7, and there are approximately 85 ceramic filters arranged, and the filtration area per module is α0367m" x 85 filters = 512m2
If the filtration flow rate is t-3m'/m"・h, the required area will be 400 m"/h ÷ 134 m" in 3 m'/h, so the required number of modules will be 154.
m”÷A12?Fl”” 45 pieces.

Then, the unit becomes as shown in FIG. 2, and the inner diameter of the shell of the filtration device 6 is about 2 m.

In addition, if an umbrella-shaped plate is provided as shown in FIG. 3, the ceramic filter can be made thinner and longer, and the diameter of the filtration device 6 can also be made smaller.

〔Effect of the invention〕

The present invention provides the following effects.

(1) Even if a normal cylindrical element is used, a sufficiently large filtration area can be secured, and the device can be combined into one unit, so there is no need to install multiple units in parallel as in the past, and flow distribution etc. No operation is required, and large-capacity filtration is possible.

(2) Even if a problem such as ceramics breaking during assembly or operation occurs, it can be easily replaced with a spare module, and the ceramic filter can also be regenerated in the event that it becomes difficult to regenerate it by reversing the end of the module. The ceramic filter of the present invention can be regenerated by replacing it with a spare module and performing high-temperature treatment or ultrasonic cleaning in hydrochloric acid or hydrofluoric acid at a separate regeneration factory during operation.・
It is practical as a high-pressure liquid f application, and is also practically effective as a ceramic filter for all types of filtration and dust collection such as low temperature applications and gas p applications.

′! By making module 4 entirely made of ceramics, practical effects can be achieved even when used as a high-temperature gas dust collection filter.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an outline of the module of the present invention, and Fig. 2 is a filtration device't equipped with a large number of modules shown in Fig. 1.
3 is a schematic diagram showing a module of the present invention provided with an umbrella-shaped plate for supporting a cylindrical ceramic filter, FIG. 4 is a diagram showing a cylindrical ceramic filter, and FIG. It is a figure which shows the case where several units incorporated in many cylindrical elements are installed in parallel. DESCRIPTION OF SYMBOLS 1... Cylindrical ceramic filter, 2... Tube plate and fitting, 5.5'... Protection tube, 4... Module, 5... Tube plate, 6... Filtration device, 7...・・・
Umbrella-shaped plate, 8... Opening patent applicant: Ebara Corporation IBIDEN Co., Ltd.

Claims (1)

[Claims] 1. A ceramic filter that filters and collects dust by attaching a number of cylindrical ceramic porous bodies with one end closed to a tube plate and flowing fluid from the cylindrical outer surface toward the inside. In this method, one module is a combination of several to several hundred cylindrical ceramic porous bodies with an outer diameter of several millimeters to several tens of millimeters, and any module can be attached to the tube plate of the device. A structure of a ceramic filter characterized by being able to be installed and removed using screws or flanges. 2. Claim 1, characterized in that a protective tube is attached to the outside of the cylindrical ceramic porous body group of the module, extending over the entire length of the ceramic filter so as to cover the entire cylindrical ceramic porous body group. Structure of the ceramic filter described in Section 1. 3. The structure of the ceramic filter according to claim 2, wherein an arbitrary number of openings are provided in the wall of the protective tube. 4. The structure of the ceramic filter according to claim 2 or 3, characterized in that an umbrella-shaped plate is provided inside the protection tube and has a hole through which the ceramic tube group passes. 5. Claims 1 and 2, in which the material of the ceramic filter is mainly composed of β-type silicon carbide.
Structure of the ceramic filter according to item 1, 3 or 4.