JPH0243915A - Filter apparatus - Google Patents

Abstract

PURPOSE:To make the title apparatus suitable for high temp. filtering by laminating a filter material layer having electric insulating properties and a conductive ceramic base material layer having the flow resistance of a fluid to be filtered smaller than that of said filter material layer and having a mesh size larger than that of the filter material layer and provided with electrodes at both ends thereof. CONSTITUTION:At least one layer among electric insulating filter material layers 1a-1c (e.g., aggregate of a porous ceramic sintered body composed of electric insulating ceramics and having communicating voids and electric insulating ceramic fibers) and at least one layer among conductive ceramic base material layers 2a, 2b having the flow resistance of a fluid to be filtered smaller than that of the filter material layer and a mesh size larger than that of the filter material layer are laminated. Further, electrodes 3 are provided to //both ends of the base material layer so as to electrify the base material layer to generate heat. As a result, this filter becomes suitable for high temp. filtering and is not damaged at the time of regeneration due to the burning treatment of the filter.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for filtering fluids at high temperatures or for regenerating filters by incinerating trapped combustible solids at high temperatures. The invention relates to a passing device.

[Prior Art] In order to remove particles from a gaseous or liquid fluid to be filtered containing solid particles, the pores of the filter medium are smaller than the particles to be separated, or the particles are placed above the pores. It is necessary to narrow the hole size. The filtration members used in such filtration processing are collectively referred to as filters. A filtration operation using a filter is the simplest and most commonly used method for separating particles from a gas or liquid containing solid particles.

In this method, when the filtration process is performed at a constant temperature higher than room temperature, especially when the fluid to be filtered is at a high temperature and the filtration process also needs to be performed at a high temperature, an external The temperature must be controlled by heating.

For example, when solid particles are useful, if there is a change in temperature during the filtration process, the filtered solid particles may stick to the filter or the solids may crosslink and fuse together, resulting in the collection of solid particles. This is because the disadvantage is that j is small, the usable time of the filter is short, and sometimes it becomes difficult to regenerate the filter. When the filtration temperature is as high as 500° C. or higher, changes in the filtration temperature often impair the desired properties and physical properties of the solid particles.

Therefore, controlling the filtration temperature at high temperatures is extremely important.

Furthermore, in filtration where solid particles are not required, it is practically important that the filter can be reused.

If the solid is combustible, methods of recycling include incinerating the used filter in a combustion furnace, or adding fuel and burning it. As mentioned above, in high-temperature filtration, solids often stick to the filter and regeneration is difficult, and in this case the filter has no choice but to be disposable.

[Problems to be Solved by the Invention] Controlling the filtration temperature to a temperature higher than room temperature, especially at a constant temperature of 500°C or higher, is characterized by fairly large-scale incidental equipment, especially when filtered solid particles are not required. Removal costs are high and uneconomical.

In addition, when recycling filters by incineration, a considerable amount of combustible solids deposited on the filter repair body self-combust one after another, causing the temperature of the filter itself to reach 1500°C during the recycling process, damaging the constituent materials of the filter base. There is a problem with doing so.

The present invention is suitable for high-temperature filtration at such high temperatures, and
The present invention aims to provide a new filter that will not be damaged by regeneration through filter combustion treatment.

[Means for Solving the Problem] The above problem is achieved by having an electrically insulating filter material layer (A) that has a lower flow resistance of the fluid to be filtered than the filter material, and a larger opening than the filter material. A conductive ceramic base layer (B) with electrodes provided at both ends is laminated, or a filter material layer heating member consisting of an electrically insulating filter material layer (A>) and a conductive ceramic material layer provided with electrodes at both ends is used. <C) is provided,
The above (B) or (C) is made to generate heat by energization, thereby heating the filter material layer (A) to a predetermined temperature.
This is achieved by the filtration device of the present invention.

In the apparatus of the present invention, the electrically insulating filtering material constituting the filtering material layer <A) is, for example, a porous ceramic sintered body made of electrically insulating ceramics and having communicating pores, an electrically insulating Examples include an aggregate of ceramic fibers M (short tl fibers or filaments II).

The opening of this filter medium varies depending on the size of solids to be removed from the fluid to be filtered, but is generally preferably 0.1 to 500 microns (μm).

On the other hand, the material constituting the base layer (B) or the heating member (C) has a resistance of 10 to 103 Ω·cu at 500 to 1200°C.
Metals or conductive ceramics with a resistivity of t are suitable.

The base material layer (8) is made of a material having a lower fluid flow resistance and a larger opening than the above-mentioned filter material layer in order to facilitate the passage of fluid therein. For example, if it is made of porous ceramics, one with high porosity and many communicating pores with large pore diameters is selected. In the case of metal, wire mesh, perforated plate, etc. are suitable.

On the other hand, since the heating member <C> is provided in circumferential contact with a part of the filtration surface, there is no need for the fluid to pass through it. You may. Its form is substantially a filter material layer (A>
Any form can be selected as long as the entire body can be heated to a predetermined temperature range.

The above-mentioned base material layer (B) and heating member <C> are both provided with a pair of electrodes at both ends so that they can be energized by being connected to a power source.

Hereinafter, the actual WAal of the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic sectional view showing an example of the filtration device of the present invention including a base material layer, and FIG. 2 is a partial sectional view showing another example of the filtration device of the present invention including a heating member. be.

In FIG. 1, 1a, Ib, and Ic are filter material layers made of an aggregate of electrically insulating ceramic fibers, 2a, 2b are base material layers made of porous conductive ceramic having fluid permeability, and each layer is arranged alternately. They are arranged in a layered manner. 3a,
3b is each base material layer 2a.

2b are electrodes provided at both ends of the layer 1a, and 4a and 4b are electrodes provided at both ends of the layer 1a.
This is a perforated plate for fixing ~3b.

In FIG. 2, 1 is a hollow cylindrical filter material layer made of an electrically insulating ceramic porous body, and 5 is a heating member made of a lattice-shaped metal rod, which is provided so as to be in contact with the outer peripheral surface of the filter material layer. 3 is one electrode for supplying electricity to the heating member (the other electrode is not shown).

[Operations/Effects] In the filtration device of the present invention as described above, the core layer generates heat by supplying electricity to the base material layer, and this heat generation heats the filter medium layer to a predetermined temperature. Therefore, in this device, when electricity is applied to the base material layer during filtration, the filtration layer in contact with the base material layer is also heated, making it possible to perform filtration at high temperatures. In addition, when flammable solids are deposited on the filter layer when used for fluid filtration, the base material layer is energized to generate heat to externally heat the filter layer, and the combustible solids deposited on the core layer are burned and removed. be able to.

In either case, the temperature of the filtration layer can be controlled within a predetermined temperature range (for example, 500 to 1200°C) by controlling the on/off of the current supplied to the base material layer or controlling the amount of current. The filter is less likely to be damaged by high temperatures during filter regeneration processing.

Furthermore, if the filter layer becomes clogged or damaged due to long-term use, the conductive base layer can be used as is and only the filter layer needs to be replaced, which is extremely economical.

[Brief explanation of the drawing]

1 and 2 show embodiments of the present invention, respectively, with FIG. 1 being a schematic cross-sectional view of a multilayer filter equipped with a base material layer, and FIG. 2 being a hollow cylindrical filter equipped with a heating member. FIG. 1.1a, 1b...Filtering material layer 2a, 2b...Base material layer 3.3a, 3b...Electrode 4a, 4b...Porous plate 5...Heating member Fig. 1, Fig. 27

Claims (2)

[Claims] (1) At least one electrically insulating filter material layer and at least one conductive ceramic base layer that has a flow resistance of the fluid to be filtered smaller than that of the filter material and has a larger opening than the filter material. What is claimed is: 1. A filtration device characterized in that the base material layer is laminated with electrodes provided at both ends of the base material layer so that the base material layer generates heat when energized. (2) It has at least one electrically insulating filter layer, and on at least one side of the filter layer, a filter layer heating member made of conductive ceramic with electrodes provided at both ends is provided. A filtration device characterized in that the member generates heat when energized.