JPS58137423A - Filter apparatus for exhaust gas - Google Patents

Abstract

PURPOSE:To remove combustible fine particles efficiently, by a method wherein a porous filter is formed from conductive ceramic and a metallic electrode means for heating the filter by passing a current therethrough is provided. CONSTITUTION:To respective filter end surfaces of a short cylindrical porous conductive ceramic filter 1 having a large mesh size and a short cylindrical porous conductive ceramic filter 2 having a fine mesh size, metallic electrodes are formed entirely or partially in a communicated form as metallized layers 4a, 4b, 5a, 5b. To the metallized layer 4a, a circular corrugated metal net 3c made of stainless steel is attached in a contacted state so as to overlap one surface thereof with said layer 4a each other. In addition, a circular corrugated metal net 3b made of stainless steel is provided so as to hold the front and the back surfaces thereof between the metallized layer 4b and the metallized layer 5a in a state contacted with said layers 4b, 5a.

Description

[Detailed description of the invention]

The present invention relates to a filter device for removing combustible F11 heavy particles contained in gas and combustible fine particles such as carbon contained in the exhaust gas of a vehicle. This invention relates to a filter device that efficiently burns and removes filtered combustible particulates by heating the filter itself and maintaining high filtration performance. Conventionally, IJI has been used to remove carbon particles contained in the cultivated gas of automobile engines as a pollution control measure.
It has been proposed to use a filter in the gas system or the exhaust gas recirculation system, but it has the drawback that carbon accumulates and causes clogging during long-term use, resulting in pressure loss. What can be done to eliminate this drawback? (Nichrome wire = 3-heater or 5 combined with a heating metal layer in the particulate-capturing part of the filter and electrically heated)

[
) I, II, inject fuel into the capture site and heat it with the combustion heat of the fuel, or heat it by installing a high 1" electrode and using i-Jτ spark discharge, or use carbon fiber as the filter and A method was considered to prevent clogging by heating the carbon particles by applying electricity to the carbon #J&III.However, when using nichrome wire, the heating area is small. In addition, the energy efficiency is poor, and the removal of the filter to the filter is time-consuming.If a photothermal metal layer is provided, it should be placed in a thin and small area so that it does not interfere with filtration. However, the energy efficiency is poor and it takes a lot of effort to remove it, and if the temperature rise does not go well due to exhaust gas, - [after stopping the engine] carbon particles accumulated in the filter. It also occurred that the engine was not burned, and the fuel injection was 0.1 and 1.
1-Discharging method requires special equipment, -■- Energy is consumed in the fire, causing fire problems due to fuel, damage to filters due to conduction, and method using carbon removal ! lJI[l-4= It has the drawback that J: itself disappears during combustion.
child . On the other hand, ceramic honeycomb structure filters are known for similar applications, and compared to general filters, these filters have less pressure loss even when the mesh is finely woven, and because they are compact, they can be used in lit gas in automobiles. There is a U7 suitable for removing carbon, but if it becomes clogged, the filtration surface will cover a wide area, so remove the filter from the used part and heat it to burn off the carbon particles. I couldn't do without it. In addition, method 1-7 (method 1-7) for clogging prevention involves stepwise changing the fineness of the filter, such as stainless wool or alumina pellets, to disperse and capture carbon particles, and further improve fuel efficiency. It has also been proposed to heat and combust recarbon particles in the injection q/l, but there is a limit to the temperature increase because the capture of carbon particles is insufficient and the exhaust gas is in a low oxygen state. In view of the drawbacks of the conventional technology, the present inventors
5 - As a result of intensive research, we have developed a method to efficiently remove flammable particulates without worsening pressure loss and without requiring particularly complex equipment while the engine is still operating. By using porous conductive ceramic filters of different sizes arranged in the direction of gas flow, it is possible to efficiently and quickly remove combustible particulates without making major changes to the current equipment. They discovered that this could be done and completed the present invention. . That is, the gist of the present invention is to form a porous filter with pores (a) whose openings are changed in the flow direction of exhaust gas (t!) in the flow direction of exhaust gas, and to form the filter with conductive reramic. A filter device for exhaust gas provided with a metal electrode means for heating the filter with electricity; The exhaust gas filter device is provided with an exhaust gas filter device.Next, it will be explained with reference to the figures.Figure 1 shows the exhaust gas filter device which is applied to an automobile IJI gas filter device.
- Showing the first embodiment of the first invention 4. put it here,
1 represents a short cylindrical porous electrically conductive ceramic filter with large pore diameters, and 2 represents a short cylindrical porous conductive ceramic filter with small pore diameters. For example, the size of filter 1 is about LL201? le/′
Inch, filter 2 lengths (approximately 4 CVIX) / 1 inch in 1 month 1? metallized layer 4a,
411.5a, 5b, and the metallized layer 48 of the J1 horn of the filter 1, which has a large diameter hole 1-1, is made of stainless steel, etc. The circular corrugated wire mesh 3a is in an 18-touch state, while the metallized layer 51 on one side of the filter 2 with a small hole diameter
J, circular corrugated wire mesh 3G made of stainless steel, etc. are in contact with J, one side of which is in contact with J, wire mesh 3a, 3
c are each partially meta1 noise layer 4. a, 5b nirou f
At
-7- The front and back sides of the circular corrugated wire mesh 3b made of stainless steel or the like are in contact with the metallized layers 4b and 5a, respectively, sandwiched between the metallized layer 5a on the lower side of the filter 2, and in the case of J, the wire mesh 311 ) is partially soldered to the metallized layers 4b and 5a (= 5° joined by eye 1, and the whole is C1
Circular corrugated metal wire 3a porous blue electric f1 ceramic filter 1, circular corrugated wire mesh 3b. A porous conductive 171 ceramic filter 2 and a circular corrugated wire mesh 3CBfI are layered to form a cylindrical body to form a gas filter device. This cylindrical filter device is housed in a ceramic insulating cylinder 9, and inserted into an outer cylinder 12 in an insulated and tightly sealed state.
In the cylindrical filter KIW, the insulating ring '10 is moved by the pressing force of the spring 11 disposed between the insulating ring 10 and the flange 17 of the joint pipe 14 which is connected to the flange 16 of the outer cylinder 12. A support fin is attached to the locking portion 9a of the insulating tube 9 through the support fin, and the insulating tube 9 is further biased in the direction of the locking protrusion 15 attached to the inside of the outer tube 12. . Wire mesh 3a13-8 at both ends of the cylindrical filter device
- Conductors 6a and 6b are connected to C, respectively.
b, and are insulatively led to the outside of the outer cylinder 12 via insulators 13a and 13b. Ishii (guill16)
a is connected to one pole of the power supply [2] through switch 7 (!g), and conductor 5 is connected to the other pole of the power supply F; The cylindrical filter device, the conductors 6a, 6b, the switch 7, and the power supply form an energized heating circuit. It passes through the exhaust manifold as it is, and flows into the filter device from the upstream direction F, indicated by the dotted line, but the wire mesh 3a and the metallized layer 4
A is applied to a porous conductive ceramic filter 1 with a large pore diameter, so that relatively large particles among the carbon particles contained in the exhaust gas are captured by the filter. 1% of the waste passes through the metallized layer 41), the wire mesh 31] and the metallized layer 5a, and the hole row is small -9.
- The relatively small carbon particles remaining in the exhaust gas are increasingly captured in the porous conductive ceramic filter 2.The metallized layer 5b and the wire mesh 3C are Treated as usual (J, filter device P
The JJI is taken out of the t, and heads toward the downstream exhaust pipe. As a result, carbon particles are uniformly dispersed and captured in each filter 1.2. At this point, switch 7 is set to A and a3 <Thus, gold 1! The ceramic filters 1 and 2 generate heat, and the carbon particles captured almost uniformly in the filters 1.2 and 9 with less electrical energy.
)+ It is possible to burn and annihilate it quickly. In addition, by setting the electrode on the exhaust gas inflow side of the filter device to a random layer, it is possible to prevent the inflow side, for example, from the wire mesh 3a.
1 ft of carbon is piled up on the outer cylinder 12 and the filter device and the outer cylinder 12
Even if it becomes energized, the short circuit point is on the ground side, so the porous I! l Electric ceramic filter 1.20 The current rating does not decrease, the humidity of the router 1.2 does not decrease, and the car phone does not burn. Next, FIG. 2 shows a second embodiment of the first invention, in which 41 is a porous bamboo ceramic filter with a large opening diameter, and 42 is a porous conductive filter with a small opening diameter. The diameter of the first embodiment is the same as that of the first embodiment, and the two are joined at one end face to form an interface 41, forming an integral structure. There is. The other end face of the filter 41 is formed with a metal electrode as a metallized layer 43, and unlike other filters 41,
The other end surface of 2 (:) the metallic electrode is the metallized layer 4
5, the overall configuration is a metallized layer 43, a porous conductive ceramic filter 41 with a large pore diameter,
It constitutes a waste filter device consisting of a bonding interface 47, a porous conductive ceramic "noirta" 42 with a small pore diameter, and a metallized layer 45. Both metallized layers 43 and 45 of the filter device are made of stainless steel, etc., respectively. The wire meshes 4'l and 46 are connected in a state where they are partially in contact with each other, and the conductor wire 48 is further welded to the wire mesh 44, and the wire 181 is connected to the power supply via the switch 50.
On the other hand, a conductive wire 49 is welded to the wire mesh 46 and connected to the electric IF for one second. Here, the conductor 48 side is grounded, and the electrode side of the metallized layer 43 is at ground potential.
I'm here. In the above configuration J: 1" 1 gas filter device, conductor 4
9. The switch E50, the power supply E, and the conductive wire 49 collectively form an energizing heating circuit. Next, FIG. 3 shows a third embodiment of the present invention. A large-diameter porous conductive ceramic filter 52 represents a small-diameter porous conductive ceramic filter with hollow cylindrical pores.
The size of the hole opening is <f'b as in the first embodiment, and the outer circumferential surface of the filter 52 and the inner circumferential surface of the filter 51 are joined at an interface 68 to form a two-layer filter. are doing. A metallic electrode is formed on the outer peripheral surface of the filter 51 as a metallized layer 53, and a metallic electrode is also formed on the inner peripheral surface of the filter 52 as a metallized layer 54. The structure of the metallized layer 5
3. υ consisting of a porous conductive ceramic filter 51 with a large pore diameter, a w surface 68, a porous conductive ceramic filter 52 with small pores [1], and a metallized layer 54
1 gas filter HtFn. Conductive wires 63 and 64 are respectively connected to the metallized layers 53 and 54 by welding or other methods, and are led to the outside through insulators 66 and 67 in an insulated state. and the other 11 ta
l 6 /l is directly connected to the other pole of the power supply F. Here, the conductor 63 side is grounded, and the metalized W45
The electrode side of No. 3 is the ground type (&donna・). According to the above configuration, a filter device for gas, a conductor 63,
The switch 65, the electric wire EE, and the entire four wires 64 form a current-carrying heating circuit. ” - 4. on one of the circular end faces of the two-layer filter. L, Ir.
A non-porous insulating 11 ceramic circular plate 55 of 'i+ diameter is closely bonded. On the other hand, two-layer full t-1
A non-porous insulating circular plate 57 of li'il t is also tightly coupled to one end surface of the circular plate 5.
7 is a circular hole in the center of A and a cylindrical tube 57 fitted to the hole.
A is filled with acid to form an outflow 1'l 57h having approximately the same shape as the center hole 56 of the two-layer filter. 59 is an outer cylinder for housing the filter, and has an end wall 69 on the upstream side of the exhaust gas, and the end wall has an inflow +1
A suitable number of holes 598 are bored on the periphery of the end wall 69, and a hole 59 is also formed in the center of the end wall 69 concentrically with the end wall 69.
0 is provided. However, the hole 590 is provided for N quantification and does not need to be drilled. An annular protrusion 62b is provided perpendicularly to the end wall 69 between the inlet 59a and the hole 59c, the inner periphery of which fits the downstream end of the two-layer filter; The annular protrusion 621+ and the end wall 69 inside the annular protrusion 621+ closely support the circular plate 55 connected to the end of the 12-layer filter on the flow side, thereby maintaining an FM tight state. The entire upstream end surface of the outer cylinder 59 is covered by a short cylindrical connecting lid 14-58, with peripheral flanges 70 and 71 connected to each other in an airtight manner. Then, a part of the lid body 58 is provided with exhaust gas Tojin 1-. 158a] 4 pipe body 58c
is installed, and the pipe body cO58c is connected to the exhaust manifold. On the other hand, the entire downstream end surface 4 of the outer cylinder 59; L, ? The flanges 72 and 73 on each periphery are connected to each other by the moon-shaped connecting lid body 60 and are covered in an airtight state. :, A locking projection 61a protruding from the inner peripheral surface of the exhaust gas inflow I-1 and an annular projection whose inner peripheral surface fits the downstream end surface and the outer peripheral surface end of the two-layer filter. The locking protrusion 61a and the annular protrusion 611) are located on the downstream side of the two-layer filter. The ends are supported tightly to maintain an airtight state. Intangible 60
It has a small diameter 1"1 output hole 60 (l) on the downstream side, and is connected to an exhaust pipe (not shown). In the above configuration, it is equipped with a small diameter 1" 1 output hole 60 (l). The exhaust gas passes through the exhaust manifold as it is, and as shown in the dotted line, 1--1.
5 - Flow direction]: from the introduction ITI 58a of the connecting article 58. Furthermore, the exhaust gas flows into the inside of the outer cylinder 59 from the inlet 59a which is opened in the end wall 69 of the outer cylinder 59 and flows into the inside of the outer cylinder 59. The outer circumferential surface of the cylindrical exhaust gas filter device exposed inside passes through the remetallized layer 53 and enters its porous interior. In the porous conductive ceramic filter 51 with a large diameter, carbon particles with a relatively large diameter are captured, and then in the porous conductive ceramic filter 52 with a small diameter pore into which exhaust gas enters, carbon particles with a relatively small diameter are captured. of carbon particles are captured, and the 1"1 gas passes through the other metallized layer 54 and flows out into the center hole 56. At this point, the carbon particles are dispersed and captured throughout the filters 51 and 52. , almost all found in exhaust gas4
It's ugly. Next, the JJI gas flows out from the center hole 56 to the outlet 57bJ of the non-porous insulating ceramic circular plate 57 and from inside the outer cylinder 59 to the leakage S1-shaped lid body fi O, and then to the exhaust 11 of the pyro-16 integral 60. From eye 160d to exhaust pipe Jll +I
′? Jru. At this time, if the switch 65 of the heat circuit 110 is turned on and electricity is applied between the metallized layers 53 and 54, which are metal electrodes, the heat is dispersed and captured in the filters 51 and 52. Carbon fine particles filter 51. ．． 52
It quickly burns and disappears due to its own heat generation. Next, FIG. 4 shows a fourth embodiment of the first invention.1 Here, 81 is a porous conductive ceramic filter with large diameter pores H in the form of a hollow cylinder, and 82 is a porous conductive ceramic filter in the form of a hollow cylinder. Hole H
This shows a porous IP electrode v1 ceramic filter with a small diameter of pores 1"("). The outer circumferential surface of the filter 96 and Metalized layers 83 and 84 as metallic electrodes are respectively provided on the inner circumferential surface, and are in close contact with the metalized layer 84 on the inner circumferential surface.
- A non-porous heat-resistant closure for closing the 1st stream side of the center hole F3:) of the router 96! 1 tube 97 is inserted into the center hole 85. The filter 96, the metallized layers 83, 84, and the closed tube 97 as a whole constitute an exhaust gas filter device. ”] The filter assembly is housed in the outer cylinder 88 so that the outer circumferential surface of the child is in close contact with the inner circumferential surface of the outer cylinder, and protrudes into the inside of the outer cylinder 88.1. : Person in charge L: J to protrusion 88a, 111 gas] -
The outer tube 88 and the funnel-shaped connecting tube 89 are connected at the respective flanges 88b and 89a, and the funnel-shaped connecting tube 89 is locked on the flow side.
The filter device is connected to the downstream side of the JJI gas by the other flange 89d to maintain its position. . Also, the end 9 of the metallized layer 84 on the inner peripheral surface of the filter device
A conductive wire 91 is connected to the outer cylinder 88 by welding or the like, and a conductive wire 91 is connected to a part 94 of the outer cylinder 88 which is in direct contact with the metallized layer 83 on the outer circumferential surface of the filter device and is electrically connected to the metallized layer 83.
are connected by welding etc. -18- The conductor 91 is installed in the leakage connecting pipe 89. l
The conductor KA90 is connected to the opposite pole of the power supply 1, and the CI wire 90 side is connected to the power source 1- through the switch 92. 171 Toshikawa Noirta device, outer cylinder 88, 1mm) 90.91, switch 92, and the entire power source F form an energization heating circuit C'. In the following configuration, carbon from the engine is The II gas containing fine particles passes through the exhaust 1 to the manifold as it is and enters the C1 foreign exchange 88, as shown by the dotted line.
JJI Soil Flow Direction FJ First, the soil flows into the large diameter filter 81 of hole 1-1. Since there is a closed pipe rs, 23(・) in the center hole 85 of the filter 81, the S1 gas will not pass through to the exhaust pipe side B as it is. Hole 1 of filter 81\Infiltration 1J, JJ1
Of the carbon particles in the gas, 11 (t
r is dispersed and captured throughout the filter 81, and then passes through the interface 86 and the exhaust gas enters the filter 82-19
-- When the remaining relatively small-diameter particles are dispersed throughout the filter 82 and captured, the exhaust gas leaks out from the downstream side of the filter 82 (passes through the fit 31-shaped connecting pipe, and then flows to the downstream side B). The direction is shown in the diagram and the gas is discharged through the exhaust pipe.At this time, the heat source 92 of the heating path 111 is turned off, so that it is difficult to conduct electricity between the metallized layers 83 and 84, which are metal electrodes. b) The carbon particles dispersed and captured in the filters 81 and 82 are filtered to the filter 81.
．． Due to the heat generated by the internal body of 82, it quickly burns and disappears. Next, Fig. 5 shows an embodiment of the invention No. 2 1-1. A short cylindrical porous conductive ceramic filter with a small opening diameter is used, and the diameter of the opening is the same as that of the first embodiment of the first invention, and 24 is a porous conductive ceramic filter having a small opening diameter. Honey 7
J Musu's body shows a lamic heater. . The end faces of these two filters 21 and 22 and one heater 2
Is each of the lattice-shaped end faces of 4 metal? The electrode is 20
- Talizing layer 29+1, 29b, 30a, 30b,
28a, 2811. One metallized layer 291) of the filter 210 and one metallized layer 30a of the noil filter 22 are connected to the surface of a circular corrugated wire mesh 23b made of stainless steel, etc., and are in contact with the metalized layers 29h, 30a, respectively. In some cases, the wire mesh 23b is partially electrically connected to the metallized layers 29b and 30a by brazing.Also, the other metallized layer 29a of the filter 21 and one metallized layer 28b of the heater 24 are connected to each other by brazing. The front and back sides of the circular corrugated wire mesh 23a made of stainless steel or the like are in contact with the metallized layers 29a and 28b, respectively, and in some cases, the wire mesh 23a partially contacts the metallized layers 29a and 28b.
It is electrically connected by brazing. A circular corrugated wire mesh 230 made of stainless steel or the like is in contact with the metallized layer 30b on the other end surface of the filter 22 so that its negative surface overlaps with the metallized layer 30b on the other end surface of the filter 22.
is partially metallized IIM: 10 to 21 - electrically connected by solder (=jl).Similarly, the metallized layer 2 on the other grid-like end surface of
88, a circular corrugated wire mesh 27 made of stainless steel or the like is in contact with the wire mesh 27 so that their negative surfaces overlap.
Brazing is applied partially to the metallized layer 28a.

[Electrically connected by As a whole, from the DI gas 1 flow side F, the circular corrugated wire mesh 27, the honeycomb structure ceramic heater 24, the circular corrugated wire mesh 23a, the short cylindrical porous conductive ceramic filter 21 with a large hole diameter, and the circular The short cylindrical porous conductive ceramic filter 22 and the circular corrugated wire mesh 23'C are laminated to form an integrated cylindrical body, forming an exhaust gas filter device. . Is the above filter device I? The filter device is housed in a lamic insulating cylinder 31 and inserted into the outer cylinder 33 in an insulated and tightly sealed state, and the filter device is connected to the flange 331 of the outer cylinder 33.
Insulation 1n is inserted through the insulating ring 32 by the force of the spring hole 37 disposed between the flange 36 of the pipe 3b and the insulating ring 32.
It is supported by being biased by the locking portion 31a of 31 and further biased in the direction of a protrusion 33a of the lock 11 provided inside the outer cylinder 33. Conductive wires 38a and 38b are electrically connected to wire meshes 27 and 23G at both ends of the filter device by brazing at portions 3'la and 34b, respectively, and are insulated through insulators/IOA and 'lOI]. It is led out to the outside of the outer cylinder 33. The i# conductor 8i+ is connected to one pole of the power source F via a switch 39, and is grounded to the vehicle body between the power source F and the switch 13f). On the other hand, the conductor 38I) is connected to the terminal of the power supply E, and the conductor 38I) is connected to the terminal of the power supply E,
The switch 39 and the electric &a F as a whole form an energizing heating circuit. In the above configuration, the exhaust gas containing carbon particles from the engine directly passes through the exhaust manifold and flows into the filter device in the flow direction F as shown in FIG. 3. Then, first, the IJ+ gas passes through the wire mesh 27, c...-ll of the cam structure heater 24! 1 wall 26 wall partition 6 flows through the passage 23 toward the downstream side [3]. Next, wire mesh 23
a1 metallization 1129a, porous conductive ceramic filter 21 with large pore diameter, metallization layer 29b,
Wire mesh 2 3b, metallized layer 30a. Porous conductive ceramic filter 22 with small diameter pores H
, passes through the metallization 1F130 b and the wire mesh 23C, exits the filter device 1) and flows in the downstream direction B'\flow, υ
11F is discharged into the trachea. At this time, if the switch 39 is turned on and the wire meshes 27 and 23G at both ends of the filter device are energized,
The exhaust gas containing carbon m particles is first heated in advance by the heater 24, and then the carbon particles are captured and burned by both filters 21 and 22. Here, in addition to the effects of the first embodiment of the first invention, the exhaust gas is heated in advance by the heater 24, and the filters 21 and 22 are used to heat the exhaust gas at a temperature lower than the carbon particulate combustion' temperature. It is never cooled down. In particular, on the upstream side of the filter 21, if the exhaust gas is not heated in advance, 1 liter of carbon particles -24= will accumulate, which may increase the pressure loss. 22
In total, carbon is efficiently burned and removed. In addition to the honeycomb structure, porous materials similar to those used in filters can be used as the heater with the same effect. In the first to fourth embodiments of the 1Mth invention and the second embodiment of the invention, the porous conductive ceramic filter includes a spongy structure having communicating pores in a distributed manner, a felt-like structure, It is possible to employ a conductive ceramic filter such as an aggregate structure of a large number of linear cables such as a woven fabric molded body. The method for producing the above-mentioned porous conductive ceramic filters is other than firing and producing raw ceramics whose composition is made porous by firing or by heat treatment in a popular atmosphere after firing. For example, it is done as follows. In addition to the main components such as silicon carbide or molybdenum disilicide,
Fine raw material powder containing sintering aids such as alumina and silica, an organic binder such as sodium alginate, anthin alginate, and polyvinyl alcohol, and a solvent such as water and 1-methyl alcohol are added and kneaded. A slurry-like mixture is prepared, and a plus deformed polyurethane of a desired shape with a predetermined mesh size is immersed in it, and after drying, it is heated at around 1600° in an air atmosphere or a nitrogen atmosphere. Obtained by firing. In the above method for manufacturing a porous filter, a plastic film having a predetermined shape such as a rectangular parallelepiped or a hollow cylinder having a mesh size of 2-mesh is bonded in advance to a shape C slurry-like composition. After soaking and drying, or after separately soaking, drying and calcination, the two foams were bonded with a slurry-like mixture and then baked. ) Two-layer filters of various shapes can be manufactured. In addition, in order to manufacture a honeycomb structure, a die consisting of a large number of sulins 1 to 1 is used, in which the cross-sectional shape of the through hole is a polygon such as a triangle, square, hexagon, or a predetermined shape such as a circle or an ellipse. More clay-like cow's 26 = J to push out the ramic, 4fl! Obtain a long piece of I structure, cut the long piece to the required size, and then fire it to make 6 filter wall honeycomb pieces in one piece.
(Too much.) The metallic electrode means is made of a material such as platinum, etc. Metal powder paste 1 - Or formed by baking a powder paste mixture of nickel, balt, etc. and silicon etc.
3. In this case, it does not have to be formed on the entire end face, but may be formed at appropriate intervals in a lattice shape, striped shape, etc.
[Platinum and L] Radium mixture is an alloy, a mixture of platinum and palladium, or a catalyst metal such as a banma alloy is dispersed in 10
Hold 1! It is important to keep the carbon incineration in a low lagoon.
It is advantageous because you can perform Ji[gu]. This can be achieved, for example, by using porous M￥m afforestation with catalytic metal acid
1%, (11 solution (after immersion, relatively high temperature C heat treatment) 1! J, especially J) is too much. According to the exhaust gas filter device of the invention, for example, the carbon particulates in 10,000 particles of carbon particles in the lifting platform applied to the exhaust purification of OJ cars have different diameters of the pores of the filter. i′ filtration causes carbon to be dispersed and captured in each filter according to particle size, resulting in a fraction t5-4 of carbon throughout the filter, thus e.g. The front side is like a filter with a constant value.
W will accumulate and cause clogging) I will run out of sharpness. Moreover, since the filter itself is a Pti heat conductor and conducts electricity to the electrodes of the filter, all of the carbon particles dispersed throughout the filter as described above contribute to the heat generation of the entire filter. By simultaneously being instantaneously heated, the combustion is extinguished quickly and efficiently.1 On the other hand, in the invention of 2rr1+i, the effect of the first invention is added to the effect of the first invention described above. I decided to install a self-energizing heat generating 1111 heater with a porous structure.
The combustion of particulates is hindered, especially in filters.
28 - Due to cooling by exhaust gas or outside air for reburning on the first flow side of the filter, carbon particulates are not burned out and remain in the filter
11, and the exhaust gas is rapidly heated in advance before passing through the filter. Since the stomach can become thirsty, even if the excrement reaches the filter, the exhaust gas is already 91'?Aii, so it is closed.
The front surface of the filter is not cooled below the combustion temperature of carbon, and the carbon particles captured by the filter are quickly burned and extinguished, preventing clogging, and automatically driving under any conditions. This prevents unnecessary loss of engine output due to clogging of the odor Cb1 noilter.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the exhaust gas filter device of the first invention, Fig. 2 is a sectional view of the second embodiment, Fig. 3 is a sectional view of the third embodiment, and Fig. 4 is a sectional view of the third embodiment. A sectional view of the fourth embodiment, and FIG. 5 is a sectional view of an embodiment of the exhaust gas filter device of the second invention. -29= 1.21.41.51.81...Porous conductive ceramic filter with large pore diameter 2.22.42.52.82...Porous conductive with small pore diameter Ceramic filters 4a, 4b, 5a, 5b, 29a, 29b, 30a,
30b, = 13.45.53.54.83.81...
・Metallic electrode means 24...Self-energizing heating type heater Agent Patent attorney Tsutomu Seiri-30- JP-A-58-137423 (9>

Claims (1)

[Claims]1.
In the porous filter made by heating, the filter is formed of S-conducting ceramic, and the filter is heated with electricity! Exhaust gas filter device equipped with ζ metal electrode means. 2. The porous filter has individual holes of uniform diameter,
A special filter layer formed by arranging 2 filter layers with different hole diameters in the flow direction of 11 gas so that the hole openings are small. 3. The exhaust gas filter device according to claim 1. 3. The exhaust gas filter device according to claim 1 or 2, wherein the disposed filter layer is made of an integral WJ structure. Apparatus. 4. For exhaust gas according to claim 1 or 2, in which the arranged filter layers are individually separated]
C ruta device. -1- Is the first stage of 5 metallic electrodes one of the exhaust gases? Claims 1 or 2, wherein the filter holes 1:J change direction are electrically connected in series, and the upstream electrode is at ground potential. Nof filter device for exhaust gas as described in . 6. JJI gas filter co-location device 7 according to claim 1, wherein the filter has a hollow cylindrical shape, metallic electrode means are provided on the inner and outer surfaces of the filter, and the outer surface electrodes are at ground potential. 2. The filter device for I+ gas according to claim 1, wherein the s-electroconductor has silicon carbide as its main component. 8's Denkan Ceramic is -LT-treated molybdenum monoride as a main component.
9. The exhaust gas filter device according to claim 1, wherein a catalyst metal is supported on the whole or a part of the surface of the porous filter in a distribution of 1J:. 10 In a porous filter in which the diameter of pores 1'' is changed to decrease in the flow direction of exhaust gas,
- the filter is made of conductive material, and
Metal power purchase 44 for heating the end face with electricity!
One stage was installed, and a self-energizing heating type heater with a narrow pore II4 structure with a contact area with the gas was placed on the -1 flow side of the filter. gas filter k i
i#,.