JP3078940B2 - Exhaust gas treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment apparatus having a filter provided in a casing incorporated in an exhaust passage for purifying exhaust gas from an engine.

[0002]

2. Description of the Related Art Diesel engine combustion is based on so-called heterogeneous mixing in which fuel is injected into high-temperature, high-pressure air. Heterogeneous mixing differs from a homogeneous mixture in that air and fuel are not uniformly mixed, so the carbon component in the fuel changes to soot, HC, etc. due to the high-temperature heat of combustion, and they aggregate to form particulates. Released into the air. Smoke is suspended in the air as fine particles of carbon and hydrocarbons attached to the periphery of the smoke.
The degree of transparency of the air deteriorates extremely.

Conventionally, as an exhaust gas treatment device, for example,
Cordierite (2MgO.2Al ₂ O ₃ .5SiO
_2. Description of the Related Art There is known an exhaust particulate purification device for a diesel engine in which two sets of filters having a porous honeycomb structure manufactured in ₂ ) are arranged in parallel in an exhaust passage. The exhaust particulate purifying device passes the exhaust gas through one of the filters having a honeycomb structure, captures carbon in the exhaust gas with the filter, and when the carbon is deposited on the filter and is clogged, the exhaust gas is passed through the filter. The flow is cut off, the exhaust gas is switched to another filter, air is sent from the downstream side of the clogged filter, and the filter is heated to incinerate the clogged carbon (for example, See Japanese Utility Model Laid-Open No. 1-144427).

[0004] Japanese Utility Model Laid-Open Publication No. 1-136617 discloses a particulate filter. In the particulate filter, thin-walled porous elements also serving as heaters made of conductive ceramics are arranged in a plurality of stages, and power can be individually supplied to each of the porous elements and each of the powers can be controlled.

Japanese Utility Model Laid-Open Publication No. 3-116722 discloses an exhaust gas purifying apparatus for a diesel engine. The exhaust gas purifying apparatus for a diesel engine includes a columnar ceramic filter in which a number of cells extending in a longitudinal direction are formed, and an electric heating member provided on an outer periphery of the filter. , Filled with a powder having good thermal conductivity.

[0006]

Incidentally, diesel particulate is a composite of carbon and hydrocarbon contained in a diesel engine, and its size is several μm.
To several tens of μm. The particulates easily react with oxygen and burn, but the combustion requires a high temperature, and cannot be completely burned only by the exhaust gas temperature. Many devices for removing particulates and smoke have been developed in the past, but they all have drawbacks and cannot be put to practical use at present. Exhaust gas treatment equipment (DPF) that collects particulate matter such as carbon, soot, and HC contained in exhaust gas exhausted from a diesel engine with a filter and incinerates the particulate matter such as carbon, soot, HC, etc. That is, the particulate matter is collected by the filter, and when the particulate matter accumulates on the filter, the particulate matter is incinerated by heating with an ignition glow plug or a heater.

[0007] Further, in the conventional automobile, electric energy is insufficient and a sufficient amount of power generation cannot be obtained. Although a large-capacity generator may be used for power generation, conventional DC and AC generators have too large a generator capacity, which makes it difficult to mount them on an engine in terms of space. In an AC machine using a permanent magnet as a rotating body, a brush is not required for the rotor, and the resistance to the rotating body is small, so that the rotating body can be rotated at high speed. Therefore, if a generator consisting of permanent magnets with high magnetic force is made to rotate at high speed, a large amount of power can be obtained, and it is possible to constantly supply electric energy to the above diesel particulate filter. it can. For example, a large power generation amount can be obtained by providing a turbocharger operated by exhaust gas energy of an engine with a generator made of a permanent magnet having a high magnetic force.

However, in the particulate incineration method, the temperature rises excessively due to the combustion of soot and the like.
There is a problem that a ceramic filter such as cordierite is broken, cracked, burned out and the like, and the filter is damaged, which is not preferable in practical use. In particular, even if the filter is made of heat-resistant ceramics, if the particulates deposited on the filter are not uniformly burned, many high-temperature portions exist locally in the filter, and cracks and the like will occur in the ceramics that make up the filter. There are many examples.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. In order to effectively use electric energy in a filter when regenerating the filter, electric heaters, that is, heaters are arranged in a stacked manner and connected in series. In addition, a filter is provided in a casing incorporated in an exhaust passage for efficiently raising the temperature of each stage of the heater and purifying the exhaust gas. In particular, carbon, soot, Applicable for incineration of particulates such as HC. Preferably, the filter is made of non-conductive porous ceramics to prevent the presence of particulates in the filter from being locally deposited. A heater is laminated to the DC in the filter so that uniform combustion takes place within the filter, and the heater is energized to constantly apply the filter. And, in the gas purifying exhaust gas by burning the particulates, also is to provide an exhaust gas treatment apparatus using the power recovered power to energize the heater in the exhaust gas energy of the engine.

[0010]

SUMMARY OF THE INVENTION The present invention provides a casing incorporated in an exhaust passage through which exhaust gas from an engine flows, a pair of processing chambers formed by dividing the inside of the casing into two by a partition plate, and each of the processing chambers. A switching valve having a leak hole for opening and closing the inlet of the chamber and allowing a small amount of exhaust gas to flow into the processing chamber on the closed side; filters each sequentially stacked in the processing chamber in the exhaust gas flow direction; Each of the heaters extending in a direction intersecting with the exhaust gas flow and electrically arranged in series in a non-contact state with each other and sequentially separated from each other;
And a power supply means for supplying electric power to the respective heaters, wherein each of the filters is made of non-conductive porous ceramics, and each of the heaters is sequentially bent from an upstream side to a downstream side by each of the filters. And an exhaust gas treatment device which is electrically connected to each other in series and extends.

The power supply means is constituted by a generator provided in the exhaust passage on the upstream side of the casing and generating electric power by operating a turbocharger driven by exhaust gas energy of the engine.

Further, in this exhaust gas treatment device, a heat insulating material is disposed between the casing and the filter.

In this exhaust gas treatment apparatus, the switching valve is switched after a predetermined set period by a timer.

This exhaust gas processing apparatus controls the switching time of the switching valve in response to a detection signal of each pressure sensor for detecting an exhaust gas pressure in each of the processing chambers, and the pressure sensor. It has a controller that controls the supply of power to each heater.

[0015] Since this exhaust gas treatment apparatus is configured as described above, the filter can be heated constantly or intermittently by the heater, and the carbon, soot,
Burn particulates such as HC immediately into gas,
There is no excessive accumulation of particulates in the filter, no local high-temperature portions are generated in the filter, and the filter is not damaged by cracks, cracks, burnout and the like.

In particular, by switching the switching valve, one of the processing chambers opens the switching valve and a large amount of exhaust gas flows, while the other processing chamber has a small amount of exhaust gas flowing through the leak hole. Because of this, the filter in which a small amount of exhaust gas flows quickly rises in temperature by the heater, and the trapped particulates such as carbon, soot, and HC are promptly incinerated. With the particulates incinerated, the switching valve is switched to incinerate the particulates collected in the filter in the other processing chamber. By repeating the switching operation of the switching valve, the filter can always be efficiently purified.

However, in order to incinerate the particulates collected by the filter, the temperature of the exhaust gas must be maintained at a high temperature, and the flow velocity of the exhaust gas passing through the filter is reduced so that the cooling effect is not generated. In addition, it is effective to increase the heating heat energy in multiple stages to reach the particulate combustion temperature.
For example, if the inside of the casing is not divided into two parts, and if the entire amount of exhaust gas is passed through the filter, the amount of passing exhaust gas becomes too large and heat energy is taken by the exhaust gas.
A phenomenon occurs in which the temperature of the filter cannot rise and the particulates cannot be incinerated.

Further, since a generator for generating electricity by the operation of a turbocharger driven by the exhaust gas energy of the engine is used as the power supply means, a large amount of electric power is required to supply electricity to the heater. The power supplied to the filter is a power generated by exhaust gas energy using a generator provided in the turbocharger, and the power is not insufficient and the collecting function and the incineration function of the filter are not reduced. Therefore, the heater can be always supplied with electric power, the filter can be constantly heated, and the particulates such as carbon trapped in the filter can be incinerated immediately. Is not clogged.

Further, the exhaust gas processing apparatus responds to detection signals of a sensor for detecting an exhaust gas pressure in each processing chamber and a sensor for detecting an operating state of the engine, which are arranged on the inlet side of each processing chamber by a controller. The switching time of the switching valve is controlled and the supply of power to each heater is controlled, so that the switching time of the switching valve can be given a degree of freedom. The switching valve can be switched accordingly, the filters can be constantly maintained in an optimal state in which particulates can be collected, and the efficiency of collecting particulates by each filter can be increased.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an exhaust gas treatment apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view showing one embodiment of an exhaust gas treatment apparatus according to the present invention. In this exhaust gas processing apparatus 1, the inside of a casing 20 arranged in an exhaust system such as the exhaust passage 2 is divided into two by a partition plate 16 to form a pair of processing chambers 25 and 26. Filter 4 made of non-conductive porous ceramics capable of purifying exhaust gas
It is a dual type that accommodates. Each processing room 2
A switching valve 17 is disposed in the inlet passage 27 of each of the processing chambers 5 and 26, and the switching valve 17 is configured to be capable of switching between open and closed so as to open one of the processing chambers 25 and 26 and close the other. In addition, the switching valve 17 includes
A leak hole 21 through which a small amount of exhaust gas can flow is formed in the processing chamber 25 or 26 on the closed side. Further, in the exhaust gas processing apparatus 1, the respective heaters 22 are disposed in the respective processing chambers 25 and 26 so as to be in non-contact with each other in a direction crossing the flow of the exhaust gas and to be sequentially separated in the flow direction. . The filter 4 is arranged so as to fill the space between the heaters 22. The heater 22 is electrically connected in series from the upstream side to the downstream side in the exhaust gas flow direction by the conductive connection member 15. Each connection member 15
May be the heater 22 itself. In this case, the heater 22 is composed of one heater from the upstream side to the downstream side in the flow direction of the exhaust gas, and is bent sequentially from the upstream side to the downstream side as shown in the figure. It will be formed in the state where it was done.
A heat insulating material 19 is disposed between the casing 20 and the filter 4 in order to prevent the heat energy of the exhaust gas from radiating to the outside.

Further, in order to burn the particulates collected by the filter 4, there is provided an electric power supply means for supplying electric power to the heater 22. The power supply means varies depending on the exhaust system in which the exhaust gas treatment device 1 is used. When the exhaust gas treatment device 1 is applied to stationary equipment, a normal power supply is used, or FIG. A turbocharger 5 having a generator 6 as shown can be used. The turbocharger 5 has a turbine 7 driven by exhaust gas energy at one end, a compressor 8 at the other end of a shaft 11 having one end fixed to the turbine 7, and a high magnetic force fixed to the shaft 11. A generator is formed by forming a rotor using permanent magnets 9 and arranging an electromagnetic coil as a stator on the outer periphery of the rotor. Since the generator 6 does not have a brush or the like and the rotor and the stator are in a non-contact state, a large power generation amount can be obtained. In this case, the turbocharger 5 does not necessarily need to be provided with the compressor 8 and can be configured as a power generation turbine having only the generator 6. Further, in the exhaust gas processing apparatus 1, each pressure sensor 13 for detecting the exhaust gas pressure at the inlet of each of the processing chambers 25 and 26 is provided. The controller 10 is configured to control the switching time of the switching valve 17 in response to the detection signal of the pressure sensor 13 and to control the supply of electric power to each heater 22.

The filter 4 may be composed of blocks arranged in multiple stages in the processing chambers 25 and 26, and the heater 22 may be arranged between the blocks. 22 can be configured to be embedded. The filter 4 is made of a non-conductive porous ceramic, for example, aluminum oxide Al ₂
A ceramic selected from O ₃ , aluminum titanate Al ₂ TiO ₅ , silicon nitride Si ₃ N ₄ , and silicon carbide SiC, having a porosity of substantially 40% to 50% or more and a pore diameter of about 20 μm. Porous sintered materials can be used. The filter 4 can exhibit sufficient high-temperature strength to incinerate particulates such as carbon, soot, and HC. For example, the filter 4 sufficiently collects undesirable particulates such as carbon contained in exhaust gas of a diesel engine. Can be. As for the filter 4, it is preferable that the porous gap is large so that clogging does not occur, but it is preferable that the filter be manufactured by impregnating the polyurethane foam with ceramic slurry or slurry using a polyurethane foam, for example. After being solidified, it is fired to burn out the polyurethane foam, whereby a porous ceramic having a desired size, that is, a porous body can be produced. Alternatively, a slurry is prepared by mixing ceramic raw material powders, and resin particles are added to the slurry, mixed and dried and solidified, and then fired to burn off the resin particles, thereby forming a porous ceramic of a desired size. A porous body can be produced.

The heaters 22 are arranged in the casing 20 so as to be separated from each other in the longitudinal direction in the flow direction of the exhaust gas so as not to be electrically short-circuited in a non-contact state. It is efficient to apply a current to the heater 22 from the upstream side to the downstream side of the exhaust gas flow, to heat the heater 22 at each stage and raise the temperature at each stage of the porous ceramics filter 4. is there. In addition, the heater 22 and the connection member 15
Is made of a heat-resistant Ni-Cr-based metal such as Incoloy. The heater 22 is made of Ni-Cr.
When the filter 4 is made of a heat-resistant metal, the function as a heater can be sufficiently achieved by supplying electricity to the heater 22, and the filter 4 can be sufficiently maintained at a high temperature. Further, the end of the heater 22 is
Adjacent ends are electrically connected by a conductive connecting member 15, so that the heaters 22 are electrically connected in series. That is, the heaters 22 located upstream and downstream are electrically connected to each other by the connection member 15 at one end, and electrically connected to the heaters 22 located upstream and downstream by another connection member 15 at the other end. The heaters 22 are connected in a staggered manner at both ends by connecting members 15.

In the exhaust gas treatment apparatus 1, an inner wall surface of a casing 20 is shielded from heat by a heat insulating material 19 such as alumina fiber, and a plurality of heaters 22 are arranged inside the exhaust gas processing apparatus 1 in the longitudinal direction. Therefore, both the filter 4 and the heater 22 have a structure in which heat is shielded from the outside. Further, a temperature sensor may be provided to detect the temperature of the filter 4 in the casing 20. Heater 2
2 is connected to line 1 to supply power from generator 6.
4 through the controller 10.
Further, a blower (reference numeral 24 in FIG. 2) may be provided on the upstream side of the exhaust gas treatment device 1.

In the exhaust gas processing apparatus 1, the heater 22
, The filter 4 is heated by the heater 22 so that the filter 4 is red-heated, and the particulates such as carbon, soot and HC collected by the filter 4 are immediately incinerated, and the gas such as carbon dioxide is discharged. , And is released to the outside through the filter 4, and the carbon accumulation phenomenon in the filter 4 does not occur. Therefore, since non-uniform deposition and non-uniform combustion of carbon in the filter 4 do not occur, it is possible to prevent the ceramics constituting the filter 4 from burning, such as cracks and cracks. Further, when carbon is deposited on the filter 4, that is, when carbon is not collected by the filter 4, the controller 10 may perform control to turn off the switch.

When the porous ceramic having the above size is used as the porous ceramic constituting the filter 4, the exhaust gas is exhausted through the pores, but the particulates such as carbon contained in the exhaust gas are not exhausted. The filter 4 can surely collect. That is, by flowing exhaust gas from the inlet passage 27 on the upstream side of the filter 4, carbon contained in the exhaust gas is collected by the filter 4 and deposited there, but the exhaust gas is collected by the heater 22 and the filter 4. And is discharged from the outlet 18 of the exhaust gas treatment device 1 to the outside. The particulates such as carbon, soot, and HC trapped in the filter 4 are supplied to the heater 22.
When electricity is passed through the heater 22, the heater 22 itself becomes a heater,
Since the filter 4 disposed between the heaters 22 is heated and glows red, the carbon burns there and becomes carbon dioxide gas, which similarly passes through the filter 4 and the heater 22 and exits from the outlet 18. Released to the outside. In addition, since the heater 22 is almost always energized by a command from the controller 10, the carbon is always incinerated immediately, no excessive carbon is deposited in the filter 4, and the filter itself is locally heated. Never.

The exhaust gas treatment device 1 has the above-described configuration and can operate as follows. That is, for example, 12 liters of exhaust gas is exhausted from the turbine 7 of the turbocharger 5 and sent to the exhaust gas processing device 1 through the exhaust passage 2. The exhaust gas flows through the turbine 7 of the turbocharger 5 and is generated by the generator 6. In response to a command from the controller 10, an electric current is supplied to the heater 22 to heat the filter 4, and the actuator 12 is operated to close the processing chamber 26 and open the processing chamber 25 by the switching valve 17. . Most of the exhaust gas (for example, 11 to 11.5 liters) flows through the processing chamber 25, and the carbon contained in the exhaust gas is filtered by the filter 4 disposed in the processing chamber 25.
Particulates such as soot and HC are collected. On the other hand, a small amount of exhaust gas (for example, 1 to 0.5 liter) flows into the processing chamber 26 through the leak hole 21, but since the exhaust gas is small, the filter 4 is immediately red-heated by the heater 22. You. Therefore, the particulates such as carbon, soot, and HC trapped by the filter 4 in the processing chamber 26 are immediately incinerated, turned into gas and exhausted from the outlet 18, and the filter 4 is in a purified state.

The temperature of the filter 4 in the processing chamber 25 is raised by the heater 22. However, since a large amount of exhaust gas flows, it is difficult for the filter 4 to reach a high temperature.
Is in a state where particulates such as carbon, soot, and HC are deposited. If the particulates accumulate on the filter 4, the flow of the exhaust gas is suppressed, and the exhaust gas pressure in the processing chamber 25 increases, and the exhaust gas pressure is detected by the pressure sensor 13. In response to the signal, the controller 10 issues a command to switch the switching valve 17. Alternatively, control for switching the switching valve 17 by a timer can be performed.
If you set to switch in 20 to 30 minutes,
The device itself can be easily configured. When the actuator 12 is operated, the switching valve 17 is switched, the processing chamber 25 is closed, and the processing chamber 26 is opened.
Therefore, the same exhaust gas processing as described above proceeds. By repeating such a process, the exhaust gas processing apparatus 1 has carbon, soot, H
It has the function of collecting particulates such as C, and has the function of incinerating the collected particulates in the other processing chamber, and one filter 4 is always in a purified state, so that the exhaust gas processing is always good. Can be done.

Next, an embodiment in which the exhaust gas treatment apparatus according to the present invention is mounted on an engine such as a diesel engine will be described.
This will be described with reference to FIG. FIG. 2 is a schematic explanatory view showing an embodiment of a system for treating exhaust gas of a diesel engine incorporating the exhaust gas treating apparatus according to the present invention. The exhaust gas treatment device 1 purifies exhaust gas from a diesel engine applied to a moving body such as an automobile. That is, the exhaust gas treatment device 1 is a DPF (Diesel Particulate Filter) incorporated in the exhaust passage 2 of the diesel engine 3.
Carbon, soot, HC contained in exhaust gas
And the like are collected by the filter 4, and the collected particulates are incinerated in the glowing filter 4 to form gas, thereby purifying the exhaust gas. In the diesel engine 3, a turbocharger 5 is connected to an exhaust manifold 23. An exhaust gas treatment device 1 for purifying exhaust gas emitted from the engine 3 is incorporated in the exhaust passage 2.

As a power supply source in the exhaust gas treatment device 1, a power generator / motor provided in the turbocharger 5 or a battery storing power generated by the power generator / motor can be used. Since the generator / motor provided in the turbocharger 5 has the same structure as the generator 6 described above, the same reference numerals are given and duplicate explanations are omitted, but the generator / motor in this case is It can function as a generator or an electric motor according to the operation state of the engine by a command. In this embodiment, a generator 6 is used among the generators / motors provided in the turbocharger 5 driven by the exhaust gas energy of the diesel engine 3. The generator 6 generates power when the turbine 7 of the turbocharger 5 is driven by exhaust gas energy. To send electric power to the heater 22, a large amount of electric power is required. However, if electric power is generated by the generator 6 including the permanent magnets 9 on the shaft 11 of the turbocharger 5, for example, electric power of 4 to 8 kW is generated. In addition, since this electric power is converted from the exhaust gas energy, there is no power loss and the electric power can be efficiently used for the heater 22.

If particulates such as carbon, soot, and HC accumulate in the filter 4 excessively, the filter 4 is overheated. Therefore, the pressure sensor 13 monitors the exhaust gas pressure in the processing chambers 25 and 26, and in some cases, , Filter 4
The power supply to the heater 22 can be controlled while monitoring the temperature of the heater 22. That is, the detection signal from the pressure sensor 13 is input to the controller 10, and the controller 10 controls the amount of electric power supplied to the heater 22 in response to the pressure detection signal, and controls the driving of the blower 24 to treat the exhaust gas. The amount of air sent to the device 1 can be controlled. For example, when the load of the engine is high, the amount of particulates such as carbon contained in the exhaust gas is large, and the temperature of the exhaust gas is also high. In addition, when the engine is operating under a high load, the electric power generated by the generator 6 of the turbocharger 5 becomes large. Therefore, if a part of the electric power is supplied, the particulates collected by the filter 4 are burned. It becomes gas such as carbon dioxide gas and steam.

[0032]

Since the exhaust gas treatment apparatus according to the present invention is configured as described above, the flow of exhaust gas to each of the two processing chambers divided by the partition plate is switched by the switching valve. A large amount of exhaust gas is flowed into the processing chamber, and a small amount of exhaust gas is controlled to flow into the other processing chamber. The filter through which a small amount of exhaust gas flows quickly rises in temperature by the heater, The collected particulates are rapidly incinerated. While the particulates are incinerated, the switching valve is switched to incinerate the particulates collected by the filter in the other processing chamber. The switching valve is repeatedly switched in response to a detection signal from a timer, a pressure sensor, or the like, so that the filter can be efficiently and constantly purified. The heater can constitute a continuous heater, and the filter is constantly or intermittently heated by the heater, and the particulates such as carbon collected by the filter burn immediately and are converted into gases such as carbon dioxide gas and steam. And is released through the filter. Therefore, there is no excessive accumulation of particulates in the filter, no local high-temperature portion is generated in the filter, and no damage such as cracks and burning occurs in the filter. Reliability and durability can be improved.

Further, in this exhaust gas treatment apparatus, a generator that generates electric power by operating a turbocharger driven by the exhaust gas energy of the engine can be used as power supply means. However, the power supplied to the heater is generated by exhaust gas energy using a generator provided in the turbocharger, and the power is insufficient to reduce the filtering function of the filter. There is no loss of engine power. Moreover, since the filter has an electric power that can always supply a current to the heater, the filter is always heated, so that no excessive particulates are deposited on the filter and the filter is clogged. And the ceramics of the filter are burned,
No damage.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of an exhaust gas treatment apparatus according to the present invention.

FIG. 2 is a schematic explanatory view showing one embodiment of a system for treating exhaust gas of a diesel engine incorporating the exhaust gas treating apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust gas processing apparatus 2 Exhaust passage 3 Diesel engine (engine) 4 Filter 5 Turbocharger 6 Generator 10 Controller 12 Actuator 13 Pressure sensor 15 Connecting member 16 Partition plate 17 Switching valve 19 Insulating material 20 Casing 21 Leak hole 22 Heater 25 , 26 processing room

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-92318 (JP, A) JP-A-4-50418 (JP, A) JP-A-3-286120 (JP, A) 21012 (JP, U) Japanese Utility Model Laid-open Hei 2-31330 (JP, U) Japanese Utility Model Laid-open Hei 2-31331 (JP, U) Patent 2591260 (JP, B2) Japanese Patent Publication No. 2-47248 (JP, B2) Japanese Patent Publication No. Hei 2 -11287 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 46/00-46/54 F01N 3/02-3/038

Claims (5)

(57) [Claims] An exhaust passage through which exhaust gas from an engine flows.
And a pair of processing chambers formed by dividing the inside of the casing into two by a partition plate. A small amount of exhaust gas can flow through the processing chambers on the closed side by opening and closing the inlets of the processing chambers. A switching valve having a leak hole, filters sequentially stacked in each of the processing chambers in the exhaust gas flow direction, and each filter extending in a direction intersecting the exhaust gas flow and electrically connected in a non-contact state with each other; sequentially each heater disposed spaced state, and have a power supply means for supplying power to energize the each heater to said each filter
Is formed from a non-conductive porous ceramic,
The heat heater is sequentially bent from the upstream to the downstream by each filter.
Bend and extend electrically connected to each other in series
An exhaust gas treatment device comprising: 2. The power supply means is provided in the casing.
The exhaust gas treatment according to claim 1, further comprising a generator provided in the exhaust passage on the upstream side and configured to generate power by operation of a turbocharger driven by exhaust gas energy of the engine. apparatus. Wherein the exhaust gas processing device according to claim 1 comprising a heat insulating member is disposed between said casing and said filter. Wherein said switching valve is an exhaust gas treatment apparatus according to claim 1 consisting of being switched after a predetermined set period timer. 5. A pressure sensor for detecting an exhaust gas pressure in each of the processing chambers, and a switching time of the switching valve is controlled in response to a detection signal of each of the pressure sensors, and an electric power to each of the heaters is controlled. The exhaust gas treatment device according to claim 1, further comprising a controller that controls the supply.