JPH06221135A - Exhaust gas disposing device - Google Patents

Abstract

PURPOSE:To provide an exhaust gas disposing device to heat a filter by means of a heater and collect particulate in exhaust gas by means of the filter for incineration and disposal. CONSTITUTION:Filters 4 of porous ceramics are arranged in a laminated state respectively in two treating chambers 25 and 26 into which the interior of a casing 20 is divided by means of a partition plate 16. One treating chamber is released to collect particulate in exhaust gas and the other treating chamber is closed and slight exhaust gas is forced to flow to incinerate and dispose the collected particulate. A power from the generator 6 of a turbocharger 5 is fed to a heater 22, a filter 4 is heated to redness by means of the heater 22, and particulate collected by means of the filter 4 is incinerated and disposed.

Description

Detailed Description of the Invention

[0001]

This invention relates to an engine, a combustion furnace,
To purify the exhaust gas discharged from incinerators,
The present invention relates to an exhaust gas treatment device having a filter arranged in a casing incorporated in an exhaust system.

[0002]

2. Description of the Related Art Combustion of a diesel engine is based on so-called heterogeneous mixing, in which fuel is injected into high temperature, high pressure air. Heterogeneous mixing is different from 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, It is released into the air. The smoke becomes particulates in which finely divided carbon and hydrocarbons adhere to the outer periphery thereof and floats in the atmosphere, so that pollution of the urban environment progresses and the transparency of the air deteriorates extremely.

Conventionally, as an exhaust gas treatment device for treating engine exhaust gas, for example, cordierite (2M
An exhaust particulate purifying device for a diesel engine is disclosed in which two sets of filters having a porous honeycomb structure made of gO.2Al ₂ O ₃ .5SiO ₂ ) are arranged in parallel in an exhaust passage. The exhaust gas purification apparatus of the diesel engine passes the exhaust gas through one of the filters having a honeycomb structure, collects carbon in the exhaust gas by the filter, and when the carbon is deposited and clogged in the filter, Cut off exhaust gas flow to the filter, switch to flow exhaust gas to another filter, send air from the downstream side of the clogged filter, heat the filter and incinerate the clogged carbon It is a thing. As an exhaust particulate purifying device for such a diesel engine, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 1-144427.

Further, Japanese Utility Model Laid-Open No. 1-136617 discloses a particulate filter. The particulate filter has a plurality of thin porous elements that also serve as heaters made of conductive ceramics and is arranged in a plurality of stages so that electric power can be individually supplied to each porous element and each electric power can be controlled.

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

[0006]

By the way, diesel particulate is a compound of carbon and hydrocarbon contained in a diesel engine, and its size is several μm.
To several tens of μm. The particulate reacts with oxygen and burns easily, but the burning requires a high temperature and cannot be burned completely only by the temperature of the exhaust gas. Therefore, many devices for removing particulates and smoke have been developed from the past, but all have drawbacks and cannot be put to practical use at present.
Particulates (P) of carbon, soot, HC, etc. contained in the exhaust gas discharged from the diesel engine (D)
In an exhaust gas treatment device that collects and incinerates gas with a filter (F), particulates such as carbon, soot, and HC are collected with a filter body, that is, for ignition when particulates are deposited on the filter. It is heated by a glow plug or heater to incinerate particulates such as soot.

In addition, the conventional automobile lacks electric energy, and cannot generate a sufficient amount of power generation.
For power generation, a large-capacity generator may be used, but with a conventional DC or AC generator, the generator capacity becomes too large,
It becomes difficult to mount it on the engine due to space constraints. In an AC machine using a permanent magnet as a rotating body, a brush is not required for the rotor and resistance to the rotating body is small, so that the rotating body can be rotated at high speed. Therefore, if a generator with a structure that rotates a permanent magnet with a high magnetic force at high speed can be produced, a large amount of power generation can be obtained, and electric energy is constantly supplied to the diesel particulate filter as described above. can do. For example, a large amount of power generation can be obtained by providing a turbocharger that operates with the exhaust gas energy of the engine with a generator composed of a permanent magnet having a high magnetic force.

However, in such a particulate incineration method, the temperature rises excessively due to the combustion of soot and the like, and, for example, a ceramic filter such as cordierite is cracked, cracked, burnt, etc., and the filter is damaged. There is a problem in that it is not preferable in practical use.
In particular, even if the filter is made of heat-resistant ceramics, in the non-uniform combustion of particulates such as soot deposited on the filter, there are many high temperature parts locally in the filter,
In many cases, cracks or the like occur in the ceramics that make up the filter.

Therefore, an object of the present invention is to solve the above-mentioned problems, and when supplying electric energy to an exhaust gas treatment apparatus, in order to effectively use the electric energy, heating methods are connected in series. It is better to arrange it so that electric heaters, that is, heating heaters, are stacked so that it is efficient to raise the temperature at each stage of the heating heaters, and it is installed in the exhaust system to purify the exhaust gas. A filter is placed in the casing that is used to remove carbon, soot,
It is preferably applied to an exhaust gas treatment device that incinerates particulate matter such as HC. The filter is made of porous ceramics, and the presence of particulates in the filter is prevented from locally depositing, and the filter is always used. In order to carry out uniform combustion inside the heater, a heater is laminated on the direct current in the filter, the heater is energized to constantly heat the filter, and the particulates are incinerated into gas to purify the exhaust gas, Another object of the present invention is to provide an exhaust gas treatment device that uses electric power obtained by recovering the electric power supplied to the heater with the exhaust gas energy of the engine.

[0010]

In order to achieve the above object, the present invention is configured as follows. That is,
According to the present invention, a pair of processing chambers formed by dividing a casing arranged in an exhaust system into two by a partition plate, opening and closing an inlet of each processing chamber, and flowing a small amount of exhaust gas to the processing chambers on the closed side. A switching valve having a leak hole capable of controlling each filter, each filter made of non-conductive porous ceramics sequentially stacked in each processing chamber in the exhaust gas flow direction, and intersecting the exhaust gas flow with respect to each filter Exhaust gas characterized in that it has respective heating heaters that extend in the direction and are electrically arranged in series in a non-contact state and are sequentially spaced apart from each other, and power supply means for supplying electric power to the heating heaters. Regarding a processing device.

In this exhaust gas treatment device, the electric power supply means is composed of a generator that generates electricity by operating a turbocharger driven by the exhaust gas energy of the engine.

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

Further, in this exhaust gas treatment device, the switching valve is switched by a timer after a predetermined set period.

Further, in this exhaust gas processing apparatus, each pressure sensor for detecting the exhaust gas pressure in each processing chamber,
And a controller for controlling the switching time of the switching valve in response to the detection signal of each pressure sensor and controlling the supply of electric power to each heating heater.

[0015]

The exhaust gas treatment device according to the present invention is constructed as described above and operates as follows. That is, in this exhaust gas treatment device, a casing arranged in the exhaust system is divided into two by a partition plate to form a pair of treatment chambers, and an inlet passage of the treatment chamber is opened / closed by a switching valve having a leak hole. ,
A small amount of exhaust gas is caused to flow through the inlet passage on the closed side through a leak hole provided in the switching valve, and heaters electrically connected in series by a conductive connecting member are sequentially arranged in the processing chambers in the flow direction. In this state, the filters made of porous ceramics are arranged so as to fill the spaces between the heating heaters, so that the heating heaters can heat the filters constantly or intermittently, and the carbon collected by the filters can be heated. , Soot, HC, and other particulates are immediately incinerated into a gas, the particulates do not accumulate excessively in the filter, a local high temperature portion does not occur in the filter, and the filter cracks. It will not be damaged by cracks, burning, etc.

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 receives a small amount of exhaust gas through the leak hole. Since it is flowing, the filter in which a small amount of exhaust gas is flowing is quickly heated to a high temperature by the heater, and the collected particulates such as carbon, soot, and HC are quickly incinerated. It With the particulates incinerated, the switching valve is switched to incinerate the particulates collected by the filter in the other processing chamber. By repeating such switching operation of the switching valve, the filter can be efficiently and constantly purified.

However, in order to incinerate the particulates collected by the filter, the temperature of the exhaust gas is kept 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 particular, it is effective to increase the heat energy of heating in multiple stages to reach the combustion temperature of particulates.
For example, when the inside of the casing is not divided into two, when the entire amount of exhaust gas is passed through the filter, the amount of passing exhaust gas becomes too large, heat energy is taken away by the exhaust gas, and the temperature of the filter is The phenomenon that it cannot rise and the particulates cannot be incinerated occurs.

Further, as the power supply means, since the generator for generating power by the operation of the turbocharger driven by the exhaust gas energy of the engine is used, a large amount of power is required to energize the heating heater. The electric power supplied to the heater is the electric power generated by the exhaust gas energy using the generator installed in the turbocharger, and there is no shortage of the electric power and the collection function and incineration function of the filter are not deteriorated. . Therefore, electric power can always be supplied to the heating heater, the filter can be constantly heated, and particulates such as carbon trapped in the filter can be immediately incinerated, and excess carbon accumulates on the filter. Therefore, the filter does not become clogged.

Further, in this exhaust gas treatment device, a controller detects a detection signal of a sensor for detecting an exhaust gas pressure in each of the processing chambers arranged on the inlet side of each of the processing chambers and a sensor for detecting an operating state of the engine. In response to the control of the switching time of the switching valve and the supply of electric power to the heaters, the switching time of the switching valve can be made flexible, and the filter in the processing chamber can be provided. The switching valve can be switched in accordance with the particulate trapping state, and the filter can always be maintained in an optimum state capable of trapping particulates, and the particulate trapping efficiency by each filter is improved. be able to.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 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 an embodiment of an exhaust gas treatment device according to the present invention. In the exhaust gas treatment device 1, a casing 20 disposed in an exhaust system such as an exhaust passage 2 is divided into two by a partition plate 16 to form a pair of treatment chambers 25 and 26, and the treatment chambers 25 and 26 are provided in the respective treatment chambers 25 and 26. It is a dual type housing a filter 4 made of non-conductive porous ceramics capable of purifying exhaust gas. A switching valve 17 is arranged in the inlet passage 27 of each processing chamber 25, 26, and the switching valve 17 is configured so that it can be opened and closed so as to open one of the processing chambers 25 and 26 and close the other. ing. Further, the switching valve 17 is formed with a leak hole 21 through which a small amount of exhaust gas can flow into the processing chamber 25 or 26 on the closed side. Further, in the exhaust gas processing apparatus 1, the heaters 22 are respectively arranged in the processing chambers 25 and 26 in a non-contact state in a direction intersecting with the flow of the exhaust gas and in a sequentially spaced state in the flow direction. . The filter 4 is arranged so as to fill the space between the heaters 22. The heater 22 is the conductive connecting member 1
5 electrically connects in series in the exhaust gas flow direction from the upstream side to the downstream side. Each connecting member 15 may be the heater 22 itself, and in that case, the heater 2
2 is composed of one heater from the upstream side to the downstream side in the exhaust gas flow direction, and as shown in the drawing, is formed in a state in which the heater is sequentially bent from the upstream side to the downstream side. Further, between the casing 20 and the filter 4, in order to prevent the heat energy of the exhaust gas from being radiated to the outside, the heat insulating material 1
9 are arranged.

Further, in order to burn the particulates captured by the filter 4, there is provided a power supply means for supplying 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, but when the exhaust gas treatment device 1 is applied to stationary equipment, a normal power source is used or the power supply means shown in FIG. A turbocharger 5 with a generator 6 as shown can be used. This turbocharger 5 has a turbine 7 driven by exhaust gas energy at one end and the turbine 7
The shaft 8 is fixed at one end to the compressor 8 at the other end.
In addition, a permanent magnet 9 having a high magnetic force fixed to a shaft 11 is used to form a rotor, and an electromagnetic coil as a stator is arranged on the outer periphery of the rotor to form a generator 6. is there. Since such a generator 6 does not have a brush or the like and the rotor and the stator are in a non-contact state, a large amount of power generation 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 including only the generator 6. Further, in the exhaust gas processing device 1, each pressure sensor 13 that detects the inlet exhaust gas pressure of each processing chamber 25, 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 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. It is also possible to embed 22. The filter 4 is made of a non-conductive porous ceramics, for example, aluminum oxide Al ₂
It is a ceramic selected from O ₃ , aluminum titanate Al ₂ TiO ₅ , silicon nitride Si ₃ N ₄ , and silicon carbide SiC, and has a porosity of substantially 40% to 50% or more and a pore diameter of about 20 μm. Porous sintered materials can be used. Such a filter 4 is made of carbon,
It can exhibit high-temperature strength sufficient to incinerate particulates such as soot and HC, and, for example, can sufficiently trap particulates such as undesired carbon contained in the exhaust gas of a diesel engine. Also, filter 4
With respect to the above, the larger the porous gap is, the more clogging does not occur, which is preferable, but the manufacturing method is, for example, after impregnating the polyurethane foam with ceramic slurry, that is, using polyurethane foam, and drying and solidifying, By firing this to burn off the polyurethane foam, a porous ceramic having a desired size, that is, a porous body can be produced. Alternatively, a raw material powder of ceramics is mixed to prepare a slurry, and resin particles are added and mixed to the slurry to be dried and solidified, and then this is burned to burn off the resin particles. A porous body can be produced.

The heaters 22 are arranged in the casing 20 so as to be longitudinally spaced from each other in the flow direction of the exhaust gas so as not to electrically short-circuit 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 each stage of the heater 22 to raise the temperature of each stage of the porous ceramic filter 4. is there. In addition, the heater 22 and the connecting member 15
Is made of a Ni-Cr heat resistant metal such as incoloy. Further, the heater 22 is set to Ni-Cr.
When the heat-resistant metal of the system is used, the function as a heater can be sufficiently fulfilled by supplying electricity to the heater 22, and the filter 4 can be sufficiently maintained in a high temperature state. Furthermore, the end of the heater 22 is
Adjacent ends are electrically connected by the conductive connecting member 15, and therefore 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 connecting member 15 at one end, and electrically connected to the heaters 22 located upstream and downstream by another connecting member 15 at the other end. The heaters 22 are connected in a zigzag manner at both ends by the connecting members 15.

This exhaust gas treatment device 1 has a casing 2
The inner wall surface of No. 0 is shielded by a heat insulating material 19 such as alumina fiber, and a large number of heaters 22 are arranged at intervals in the longitudinal direction inside thereof. Therefore, both the filter 4 and the heater 22 have a structure in which heat is shielded from the outside. A temperature sensor may be provided to detect the temperature of the filter 4 inside the casing 20. The heater 22 is connected to the heater 22 by the line 14 through the controller 10 in order to supply the electric power from the generator 6. Further, a blower device (reference numeral 24 in FIG. 2) may be provided on the upstream side of the exhaust gas treatment device 1.

In this exhaust gas treatment apparatus 1, the heater 22 is constantly energized, and the heater 22 is used to filter the filter 4.
If the filter 4 is red-heated by heating the
Particulates of carbon, soot, HC, etc. collected in step 3 are immediately incinerated, become a gas such as carbon dioxide gas, pass through the filter 4, and are released to the outside, so that the carbon accumulation phenomenon in the filter 4 does not occur. . Therefore, non-uniform deposition and non-uniform combustion of carbon in the filter 4 do not occur, so that the ceramics constituting the filter 4 can be prevented from being burnt such as cracks and cracks. Further, when the carbon is deposited on the filter 4, that is, when the carbon is not collected by the filter 4, the controller 10 may perform control to turn off the switch.

If the above-mentioned size is used as the porous ceramics constituting the filter 4, the exhaust gas is exhausted through the pores, but the particulates such as carbon contained in the exhaust gas are It can be reliably collected by the filter 4. That is, by flowing the exhaust gas from the inlet passage 27 on the upstream side of the filter 4, the carbon contained in the exhaust gas is captured by the filter 4 and deposited there, but the exhaust gas is heated by the heater 22 and the filter 4. And is discharged to the outside from the outlet 18 of the exhaust gas treatment device 1. Then, the particulates such as carbon, soot, and HC collected by the filter 4 are heated by the heater 22.
When electricity is passed through, the heater 22 itself becomes a heater,
Since the filter 4 arranged between the heaters 22 is heated and becomes red hot, carbon is burned there to become carbon dioxide gas, and the carbon dioxide gas similarly passes through the filter 4 and the heater 22 from the outlet 18. It is released to the outside. Moreover, since the heater 22 is almost always energized by a command from the controller 10, the carbon is always incinerated immediately, and excess carbon is not deposited in the filter 4, and the filter itself is locally overheated. There is no such thing.

The exhaust gas treatment device 1 is constructed as described above and can be operated as follows. That is,
For example, 12 liters of exhaust gas is turbocharged 5
The exhaust gas is exhausted from the turbine 7 and is sent to the exhaust gas processing device 1 through the exhaust passage 2. As the exhaust gas flows through the turbine 7 of the turbocharger 5, the power generator 6 generates electric power. Then, in response to a command from the controller 10, a current is passed through the heater 22 to heat the filter 4, and the actuator 12 is operated to close the processing chamber 26 side and open the processing chamber 25 side by the switching valve 17, for example. . Most exhaust gases (eg, 11-11.5)
Liter) flows through the processing chamber 25 side, and carbon contained in the exhaust gas in the filter 4 arranged in the processing chamber 25,
Particulates such as soot and HC are collected. On the other hand, although a small amount of exhaust gas (for example, 1 to 0.5 liters) flows through the leak hole 21 into the processing chamber 26, the amount of exhaust gas is small, and therefore the filter 4 is immediately red-heated by the heater 22. It Therefore, the particulates such as carbon, soot, HC, etc. collected by the filter 4 in the processing chamber 26 are immediately incinerated, become gas and are exhausted from the outlet 18, and the filter 4 is in a purified state.

Although the temperature of the filter 4 in the processing chamber 25 is raised by the heater 22, it is difficult for the filter 4 to reach a high temperature because a large amount of exhaust gas flows.
In this state, particulates such as carbon, soot, and HC are deposited. If particulates are deposited on the filter 4, the flow of exhaust gas is suppressed and the exhaust gas pressure in the processing chamber 25 rises. Since the exhaust gas pressure is detected by the pressure sensor 13, the pressure sensor 13 detects it. In response to the signal, the controller 10 issues a command to switch the switching valve 17. Alternatively, control of switching the switching valve 17 with a timer may be performed.
If you set to switch in 20 to 30 minutes,
The device itself can be easily configured. The actuator 12 operates to switch the switching valve 17, the processing chamber 25 is closed, and the processing chamber 26 is opened.
Therefore, the same exhaust gas treatment as described above will proceed. By repeating such a treatment, the exhaust gas treatment device 1 is configured such that one of the treatment chambers is treated with carbon, soot, and H.
It plays the role of collecting particulates such as C, the function of burning the particulates collected in the other processing chamber, and the one filter 4 is always in a purified state, and the exhaust gas treatment is always good. Can be done.

Next, an embodiment in which the exhaust gas treatment device according to the present invention is mounted on an engine such as a diesel engine,
This will be described with reference to FIG. FIG. 2 is a schematic explanatory view showing one embodiment of an exhaust gas treatment system for a diesel engine incorporating the exhaust gas treatment device 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, and particularly exhaust gas discharged from the diesel engine 3 is exhausted through the exhaust passage 2
Carbon, soot, HC contained in exhaust gas
The particulates such as the above are collected by the filter 4, and the collected particulates are incinerated in the red-heated filter 4 to form a gas to purify the exhaust gas. A turbocharger 5 is connected to the exhaust manifold 23 of the diesel engine 3. An exhaust gas processing device 1 that purifies exhaust gas emitted from the engine 3 is incorporated in the exhaust passage 2.

As a power supply source in the exhaust gas treatment apparatus 1, a power generator / motor provided in the turbocharger 5 or a battery storing the 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 description will be omitted.
The generator / motor in this case can function as a generator or a motor according to the operating state of the engine according to a command from the controller 10. In this embodiment, the generator 6 of the generator / motor provided in the turbocharger 5 driven by the exhaust gas energy of the diesel engine 3 is used. Generator 6 is turbocharger 5
The turbine 7 is driven by exhaust gas energy to generate electric power. A large amount of electric power is required to send electric power to the heater 22. However, if electric power is generated by the generator 6 composed of the permanent magnet 9 on the shaft 11 of the turbocharger 5, for example, electric power of 4 to 8 kw is generated. Moreover, since this electric power is converted from the exhaust gas energy, there is no power loss and the heater 22 can be efficiently used.

In this exhaust gas treatment apparatus 1, if excessive particulates such as carbon, soot, HC, etc. are deposited on the filter 4, the filter 4 will be overheated, so the pressure sensor 13 causes the exhaust gas pressure in the processing chambers 25, 26 to rise. It is possible to control the amount of electric power supplied to the heater 22 while monitoring the temperature of the filter 4 in some cases. That is, the detection signal from the pressure sensor 13 is input to the controller 10, and the controller 10 controls the power supply amount to the heater 22 in response to the pressure detection signal and also controls the drive of the blower 24 to control the exhaust gas. Device 1
It is possible to control the amount of air delivered to the. 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 high. In addition, since the electric power generated by the generator 6 of the turbocharger 5 becomes large when the engine is operating under a high load, if a part of the electric power is supplied, the particulates collected by the filter 4 will burn. It becomes a gas such as carbon dioxide and steam.

[0032]

The exhaust gas treatment device according to the present invention is constructed as described above and has the following effects.
That is, this exhaust gas processing device is divided into two processing chambers by a partition plate, the flow of exhaust gas to each processing chamber is switched by a switching valve, and a large amount of exhaust gas is flowed to one processing chamber.
It is controlled to flow a small amount of exhaust gas into the other processing chamber. The filter in which a small amount of exhaust gas is flowing is quickly heated to a high temperature by the heater, and the collected carbon,
Particulates such as soot and HC are quickly incinerated. With the particulates incinerated, the switching valve is switched to incinerate the particulates collected by the filter in the other processing chamber. Such a switching valve can be repeatedly switched in response to a detection signal from a timer, a pressure sensor, or the like, and the filter can be efficiently and constantly cleaned. The heating heater can constitute a continuous heater, the filter is constantly or intermittently heated by the heating heater, and the particulates such as carbon captured by the filter are immediately burned to carbon dioxide gas, gas such as steam. It passes through the filter and is emitted. Therefore, particulates are not excessively deposited in the filter, a local high temperature portion is not generated in the filter, and the filter is free from damage such as cracks and burnout. The reliability and durability of can be improved.

Further, in this exhaust gas treatment device, since a generator for generating power by the operation of the turbocharger driven by the exhaust gas energy of the engine can be used as a power supply means, a large amount of electric power is supplied to energize the heating heater. However, the electric power supplied to the heating heater is the electric power generated by the exhaust gas energy using the generator installed in the turbocharger, and the electric power is insufficient to deteriorate the filtering function of the filter. There is no loss of power to the engine. Moreover, since the heating heater has the electric power capable of constantly flowing the electric current, the filter is constantly heated, and the filter is not clogged with the excessive particulates. Does not occur, a high temperature part is not locally generated, and the ceramics of the filter is not burned or damaged.

[Brief description of drawings]

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

FIG. 2 is a schematic explanatory diagram showing an embodiment of an exhaust gas treatment system for a diesel engine incorporating the exhaust gas treatment device according to the present invention.

[Explanation of symbols]

 1 Exhaust Gas Treatment Device 2 Exhaust Passage (Exhaust System) 3 Diesel Engine (Engine) 4 Filter 5 Turbocharger 6 Generator 10 Controller 12 Actuator 13 Pressure Sensor 15 Connection Member 16 Partition Plate 17 Switching Valve 19 Insulation Material 20 Casing 21 Leak Hole 22 heating heater 25, 26 processing chamber

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area F01N 3/02 301 D

Claims (5)

[Claims] 1. A pair of processing chambers formed by dividing the inside of a casing arranged in an exhaust system by a partition plate, opening and closing the inlet of each processing chamber, and supplying a small amount of exhaust gas to the processing chambers on the closed side. A switching valve having a leak hole capable of flowing, filters made of non-conductive porous ceramics sequentially stacked in the processing chamber in the exhaust gas flow direction, and crossing the exhaust gas flow with respect to each filter The exhaust gas having a plurality of heating heaters that extend in the direction of rotation and that are electrically arranged in series in a non-contact state and are sequentially spaced apart from each other, and a power supply unit that supplies electric power to the heating heaters. Gas treatment equipment. 2. The power supply means comprises a generator that generates power by operating a turbocharger driven by exhaust gas energy of the engine.
The exhaust gas treatment device according to. 3. The exhaust gas treatment device according to claim 1, wherein a heat insulating material is arranged between the casing and the filter. 4. The exhaust gas treatment apparatus according to claim 1, wherein the switching valve is switched by a timer after a predetermined set period. 5. A pressure sensor for detecting an exhaust gas pressure in each processing chamber, and a switching time of the switching valve in response to a detection signal of the pressure sensor, and an electric power to be supplied to each heating heater. The exhaust gas treatment device according to claim 1, further comprising a controller that controls supply.