JP3365244B2 - Exhaust gas purification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a diesel engine.
Particulates (such as flammable fines such as soot)
Particles) collected by a filter, and the collected particulates
Exhaust gas purification device that regenerates the filter by burning the heat
About. [0002] 2. Description of the Related Art In recent years, emissions from diesel engines and the like have been increasing.
Particulates are environmental protection and health concerns
It is beginning to be regulated for reasons. Take the particulates
Except for the method of purifying exhaust gas from diesel engines.
In the middle of the exhaust pipe, a heat-resistant ceramic honeycomb structure
How to filter particulates by installing a filter
There is. The feature of this method is that the particulate
When fire accumulates, the deposited particulates are ignited.
Burn it, convert it to carbon dioxide and release it to the atmosphere.
Is to regenerate the filter cleanly and use it repeatedly.
You. Combustion regeneration (regeneration)
Option). [0003] Generally, exhaust gas from diesel engines is putty.
Is lower than the ignition temperature of the
Ticulates do not burn and only accumulate,
Particulates cause the exhaust pressure to rise excessively,
Reduces gin and emission performance. Therefore,
To regenerate the filter by combustion, use some method.
Need to raise the exhaust gas temperature or filter temperature
There is. In recent years, two filters have been installed in the exhaust system to
There has been proposed a method of alternately performing cleaning. At this time
Combustion regeneration of one filter is not during exhaust gas filtration,
Some particulates accumulate on one filter
After the exhaust gas purification with the other filter
Done. Electric heaters, burners,
There is a black wave transmitter, etc.
Heat to raise filter temperature and burn particulates
Combustion regeneration is performed by burning. Below, conventional
Exhaust gas purifying device will be described. FIG. 8 is a block diagram showing a conventional exhaust gas purifying apparatus.
It is. In FIG. 8, reference numeral 1 denotes an exhaust gas of a diesel engine.
2 Purification device, 2 for diesel engine, 3 for manifold
, 4, 5a, 5b, 9a, 9b
Gas flow path piping, 6 controls the flow path of engine exhaust gas
The valves 7a and 7b are filters for storing the filters 8a and 8b.
Storage containers, 10a, 10b and 12 are secondary empty for combustion regeneration.
Flow pipe for introducing air, 11 controls the flow path of secondary air
Introduction valve, 13 is an air blower, 16 is valve 6, introduction valve 1
1, air blower 13, exhaust valves 18a, 18b, electric heater
Controllers 20a and 20b, 19a, 1
9b is a flow path pipe for exhausting secondary air for combustion regeneration. [0005] A conventional exhaust gas purifying apparatus having the above configuration.
The operation of the combustion regeneration will be described. During the exhaust gas purification of the filter 8a,
Is a collecting amount detecting device such as a differential pressure sensor (not shown).
If it is determined that it is time to start regeneration, the pipes 4 to 5
Exhaust gas flowing to a is operated by the valve 6 and the introduction valve 11.
Flow from the pipe 4 to the pipe 5b and pass through the filter 8b.
And is discharged from the pipe 9b. one
On the other hand, the controller 16 has determined that it is time to start reproduction.
On the filter 8a side, electric power is supplied to the electric heater 20a.
And heated. At the same time, the exhaust valve 18a opens, and the air blow
A from secondary air to filter 8a through pipe 10a
Is supplied. After a certain time, the temperature of the filter 8a
When the temperature reaches the particulate ignition temperature,
Starts burning. The flue gas from pipe 19a
Will be leaked. After a certain period of time, the power to the electric heater 20a is
Power supply ends, particulates only with secondary air
Combustion continues. This combustion is a particulate flame
It is realized by carrying. After a certain period of time,
The controller 16 determines that the combustion regeneration has been completed, and
The blower 13 is stopped, the exhaust valve 18a is closed, and the secondary air
The supply is also terminated, and the filter 8a is set in a state of waiting for purification.
You. After that, filter with a trapping amount detection device such as a differential pressure sensor.
8b determines that the playback start time has been reached,
La 16 is the drainage that has been flowing from pipe 4 to pipe 5b.
The gas 6 and the introduction valve 11 are operated to operate the pipe 4 to the pipe 5.
a, and purified by passing through a filter 8a.
Then, it flows out from the pipe 9a. After this, the combustion described above
The regenerating operation is continued repeatedly, and the filters 8a and 8b
The exhaust gas purification and the combustion regeneration are alternately repeated. In the above conventional example, heating by an electric heater is
As an example, as a heating method, light oil etc.
Heating by heating or applying microwaves to heat
There is a heating method (Japanese Patent Laid-Open No. 4-136409).
The method of heating with a burner produces burner stability and flame.
There is a problem in ensuring safety for safety. [0009] The heating method using microwaves has a
Has the advantage of being able to detect the amount of trapped
Uniform heating inside the filter, microwave leakage countermeasures, use of high voltage
There is a problem in safety assurance, etc. Further, the temperature at the inlet of the filter is defined.
There is Japanese Patent Publication No. 3-36133,
Specify the temperature required to completely burn the curate
Just by this method, the ignition phenomenon is seen,
Temperature rise may cause filter breakage
There is a problem. Further, the double container is used as a filter container.
Japanese Unexamined Patent Publication No. 7-247826 as an exhaust gas purifying apparatus used
There is a gazette, but this is an electric heater
Application of combustion regeneration method by flame propagation using microwave heating
It minimizes the diffusion of heat from the filter storage container.
Minimize filter reliability and regeneration
It can be expected to improve efficiency, but due to flame propagation
Since the combustion regeneration method involves ignition, the temperature distribution in the filter
There is a limit to reducing the difference between
The problem is that there is a limit to the improvement of reproducibility and regeneration efficiency.
is there. [0012] Further, without heating the filter, high-pressure air
To remove particulates and heat outside the filter
There is also a filter regeneration method called backwash that burns,
Efficiency is low because particulates are wiped off with compressed air
High sealing performance that does not leak high-pressure air
There is a problem that the structure is necessary and complicated. [0013] As described above, the conventional
In the exhaust gas purifying device of the above, heating is performed by an electric heater or the like.
Therefore, the combustion of the particulates in the filter
Combustion caused by ignition and ignition, and the outer periphery of the filter
Then, the heat is transmitted through the filter
The temperature gradient inside the filter becomes so large that the filter
There is a problem that this may cause a lock. Further, it is possible to realize the continuation of combustion by flame propagation.
Therefore, at the outer periphery of the cooled filter,
The unburned residue occurs, lowering the regeneration efficiency and collecting
During repeated production, abnormal combustion causes high temperature and melting
It had the problem of causing a problem. Both cracks and erosion are functions of the filter.
And greatly impede its practical use.
It has become a problem. During the regeneration operation, the filter storage container
Is dangerous because of high temperature.
Vibration and shock from outside the storage container may damage the filter.
Easiness is also an issue for practical use. In this exhaust gas purifying apparatus, the filter is
Damage, damage or damage
Is required. According to the present invention, the filter has cracks.
To prevent melting and damage
To provide an exhaust gas purification device that can regenerate filters
The porpose is to do. [0018] [MEANS FOR SOLVING THE PROBLEMS]
In addition, the exhaust gas purifying apparatus of the present invention
Attached to the filter that collects particulates in wastewater
Exhaust gas purifier that burns particulates
From the outer metal tube and the inner metal tube that contains the filter.
The gap between the outer metal tube and the inner metal tube is sealed.
The hollow container, which is a hollow part,
Heats the air at a specified flow rate and blows hot air to the filter.
Heating part to attachHaving a double container communicating with the hollow part
Safety valveIt has the structure which has. As a result, the filter was cracked.
To prevent melting and damage
An exhaust gas purification device capable of regenerating filters was obtained.
You. [0020] DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention
Passes the exhaust gas to reduce the particulates in the exhaust gas.
Burn particulate matter adhering to the trapping filter.
Exhaust gas purifying equipment, comprising an outer metal tube and a filter.
Built-in inner metal tube, outer metal tube and inner metal tube
A double container in which the gap between the tube and the tube is a closed hollow portion,
Built-in internal metal tube heats air at a specified flow rate to be introduced
And a heating unit that blows hot air to the filterHave, double
The container has a safety valve communicating with the hollow part.I decided to have
Hot air is blown on the filter
Body is heated evenly and hot air is blown out by double container
And insulationIn addition, the density at high temperature during the filter regeneration operation
Prevents internal pressure rise due to gas expansion in closed hollowIs
It has the effect of [0021] [0022] Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. (Embodiment 1) FIG. 1 shows Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram showing an exhaust gas purifying apparatus, and is a diesel engine.
FIG. In FIG. 1, reference numeral 101 denotes a diesel engine.
Exhaust gas purification device, 102 is a diesel engine, 1
Reference numeral 03 denotes each exhaust hole of the diesel engine 102 (not shown).
Exhaust manifold with each upstream end connected to each other
And 104 are upstream at the downstream end of the exhaust manifold 103.
Exhaust pipe with a continuous end (hereinafter referred to as “upstream exhaust pipe”
), 105a and 105b are downstream of the upstream exhaust pipe 104.
Flow path piping branched into two from the side, 106 is upstream exhaust
Branched from the pipe 104 to each of the flow pipes 105a and 105b.
From the upstream exhaust pipe 104
Cut off the flow path of exhaust gas introduced into 105a and 105b.
Changeover valves, 107a and 107b are provided for each flow path piping.
105a and 105b are connected to the downstream ends, respectively.
Filter storage double container made by welding stainless steel, 10
8a and 108b are cordierite (2MgO.5SiO)
_Two・ 2Al_TwoO_Three) By extrusion molding method
(Φ) 5.66 inch x length (L) 6 inch wall
It consists of a ceramic filter with a flow-type honeycomb structure.
Each filter storage container 107a, 107b
Each of the stored filters, 109a and 109b
It is connected to the downstream side of the filter storage double containers 107a and 107b.
The installed downstream exhaust pipes, 110a and 110b are secondary air
Supply piping, 111 switches to switch the secondary air supply flow path
Valve, 112 is a secondary air supply pipe, 113 is secondary air
Disposed at the end of the supply pipe 112, each filter storage double volume
Supplies a predetermined amount of secondary air to the heaters 107a and 107b
Secondary air supply units 114a and 114b such as air blowers
Attached to each filter storage double container 107a, 107b
And connected to the secondary air supply pipes 110a and 110b.
Heating sections such as electric heaters, and 115a and 115b
And 116 are switching valves 106 and 111 and secondary air
The supply unit 113 and the heating units 114a and 114b are electrically connected.
And a controller for controlling the entire exhaust gas purifying apparatus 101.
Rollers 118a, 118b are discharge valves, 119a, 11
9b is connected to each end through each discharge valve 118a, 118b.
A discharge pipe connected to the flow pipes 105a and 105b, 12
Reference numerals 1a and 121b denote double containers 107a, 1
07b, both filters 108a and 108b
This is a differential pressure sensor that measures the pressure difference at the end. Here, the filter storage double container 107a,
107b, filters 108a and 108b, secondary air supply
Unit 113, heating units 114a and 114b, temperature sensor 11
5a, 115b, materials of differential pressure sensors 121a, 121b
Will be described. Dual filter storage container 107a, 107b
Consists of stainless steel SUS304 that has been heat-treated in advance.
Large and small metal tubes with different inner diameters (the outer metal tube and the inner metal tube)
And two rings to connect the two metal tubes
The cross section of the ring is a double container under high temperature
Absorbs the difference in the extension of the inner and outer metal pipes that occurs during use
For this purpose, it was formed into a V-shape or U-shape. These parts
Materials are connected by welding in an airtight manner, and the sealed hollow
To form a double container. Of the containers 107a, 107b
The material is heat resistant like the above stainless steel SUS304
The filter 108a is made of a metal having corrosion resistance and corrosion resistance.
108b contains vermiculite etc. and expands due to heat
Using a shielding material made of different materials to prevent particulate leakage
To prevent. In the above description of the structure, the particulate
The filters 108a and 108b to be collected are
5.66 inch diameter manufactured by extrusion molding
6 inch long wall flow type honeycomb structure ceramic
Mic filter was used, but mullite was used as the material.
Metal materials with excellent heat and corrosion resistance.
I don't know. Mostly cylindrical, but elliptical
It may be cylindrical or rectangular. The size is, for example, diameter 4-1
3 inches, length 5-14 inches, number of cells 1 inch flat
There are 50 to 400 pieces per side. Collected by the filter
The amount of particulates collected is determined by the filter unit volume (1
When expressed in weight (gram) per liter), 1 to 30
It is about. Soluble in one of the components of particulates
There is a device (SOF) and filters 108a and 108b
Even if collected, they do not burn during regeneration but evaporate to the atmosphere
In front of the filters 108a, 108b
Alternatively, an SOF oxidation catalyst supporting a noble metal or the like is provided later.
Is preferred. As the secondary air supply unit 113, an air blow
A, air pump, compressor, etc.
Has a large flow rate but a small static pressure.
The compressor has a large static pressure but a small flow rate. As air flow
Is 0.1-2.0 cubic meters, the more the better, the better
1 cubic meter or less is appropriate from the capacity of the means. In addition, one cubic meter
A large amount of electricity is required to heat air
To reduce power consumption by circulating heated air and using engine exhaust gas
Preferably, means are provided. The heating units 114a and 114b are made of, for example, Fe
-A heating element made of a Cr-Al alloy
Covered with an insulator, etc.
Inserted in a metal protection tube or made of ceramic
The heating element is wrapped in the support part in a heat-efficient manner.
Is preferable. Heating units 114a, 114
If b is an electric heater for heating air, the heating element and air
It has a touching structure and the heating element is a nichrome wire,
Wire, ceramic heater and the like. In addition, such as corrosion resistance
The sheath type may be used in consideration of reliability. heating
The heater capacity is determined according to the amount of air
You. The temperature sensors 115a and 115b are sheathed.
Can detect relatively high temperatures such as thermocouples and platinum resistors
It is good as long as it is exposed to exhaust gas, so corrosion resistance
Good ones are preferred. In addition, the indicated temperature by radiant heat transfer
It is preferable to consider the placement of each sensor to prevent degradation.
New Filter for differential pressure sensors 121a and 121b
The part arranged in the storage double container 107a107b has a half
Although it is preferable to use a conductor pressure sensor or the like,
Place a mist filter, etc. around the sensor to prevent direct contact.
It is preferable to arrange them. In the exhaust gas purifying apparatus configured as described above,
Hereinafter, the operation will be described with reference to FIGS.
FIG. 2 shows the operation of combustion regeneration in the exhaust gas purifying apparatus of FIG.
FIG. 3 is a flowchart illustrating the exhaust gas purifying apparatus of FIG.
When determining the temperature inside the filters 108a and 108b
FIG. 4 (a) shows a measurement position diagram showing a measurement position, using a double container.
Graph showing the experimental results when using air as the heating medium
Fig. 4 (b) uses a single container and uses air as a heating medium.
FIG. 4 (c) is a graph showing the experimental results in the case of
Regeneration by flame propagation by an electric heater using a heater
FIG. 9 is a graph showing the experimental results when the test is performed. Figure 3
130 is a hot air inflow surface, and 140 is a hot air outflow surface. Here, the exhaust gas purifying apparatus 101 is
Exhaust gas discharged from the diesel engine 102
It is assumed that purification is performed by the filter 108a. First,
The controller 116 determines whether it is the combustion regeneration time.
Next, the output signal of the differential pressure sensor 121a will be referred to. Sand
That is, the controller 116 outputs the output of the differential pressure sensor 121a.
A differential pressure signal is generated based on the signal, and the differential pressure signal
It is determined whether it is the combustion regeneration time. In the present embodiment,
The pressure on the exhaust gas inflow side of the filter housing double container 107a
The greater the pressure difference with the pressure at the exhaust gas outlet, the greater
That a lot of soot etc. is collected in the filter 108a
Control when the pressure difference is equal to or greater than the specified pressure difference.
The filter 116 determines that the filter 108a is at the time of combustion regeneration.
Set. Next, the controller 116 sends the other
In order to purify the exhaust gas with the filter
Pipe 106 so as to close the flow pipe 105a.
At the same time that the switching valve 111
Of the secondary air supply pipe 110b so as to close the side.
Inclined to the air supply pipe 110a side and the discharge valve 118
a is opened (S1). This allows diesel engines
Exhaust gas exhausted from the exhaust manifold 1
03, the flow path piping 105b is sequentially arranged from the upstream side exhaust pipe 104
Through the filter housing double container 107b through the
After the soot and the like in the exhaust gas are collected by the filter 108b, the soot
The purified gas from which the air has been removed flows from the downstream exhaust pipe 109b to the atmosphere.
Released during. Next, the controller 116 determines the running distance and
From the differential pressure signal generated in step 1, particulates such as soot
The trapping amount is calculated (S2). Next, the controller 116 calculates the calculated
Depending on the amount of particulates collected, the secondary air supply unit 1
13 is applied to the heating unit 114a while keeping the air volume from 13 constant.
Determine a combustion regeneration program that controls voltage and current
(S3). Normal temperature at a predetermined flow rate from the secondary air supply unit 113
Is discharged, and the amount of the discharged air becomes the air volume. Next, the controller 116 executes step 3
In accordance with the combustion regeneration program determined in
113 is turned on, and the voltage applied to the heating unit 114a is
Refer to the temperature signal from the temperature sensor 115a for the pressure and current.
While performing the control, the combustion regeneration operation starts (S4). Next, the controller 116 executes the combustion regeneration process.
When the time set on the program elapses, filter 1
08a is a differential pressure sensor 1
Measured by 21a, and whether the differential pressure is lower than the set value
Is determined (S5). Controller 116
When it is determined in step 5 that the differential pressure is higher than the set value, combustion regeneration
The program is continued (S6). Differential pressure lower than set value
Controller 116 determines that the secondary air
Applying to the heating unit 114a with the air volume of the supply unit 113 constant
In the combustion regeneration program that controls the voltage and current
A predetermined temperature lowering operation is started (S7). Next, the controller 116 sets the predetermined
When a predetermined time has elapsed from the start of the temperature lowering operation, the heating unit 114
Stop the voltage and current applied to a and supply secondary air
The unit 113 is turned off and the combustion regeneration operation of the filter 108a is performed.
Is completed (S8). Here, the exhaust gas purifying apparatus according to the present embodiment is described.
The experiment in the device will be described. In this experiment
Uses a filter storage double container with the hollow part placed under reduced pressure.
Using an exhaust gas purifier using air as the heating medium
After collecting particulates such as soot in the gas,
Combustion regeneration program according to the amount of trapped particulates
Set and inside the filter as shown in Fig. 3 for the experiment
9 temperature sensors T1 to T9 at positions Z1 to Z9
The temperature in the combustion regeneration operation was measured. FIG. 4A shows the experimental results. Also compare
Therefore, use a single container instead of a double container and heat the air
When burning and regenerating by heating the filter as a medium
The results are shown in FIG. 4 (b).
Of combustion regeneration by flame propagation by
FIG. 4C shows the result of the conventional apparatus. Also,
The temperature of 9 points in the filter at each time in each experimental result
The degree variation is shown in (Table 1). [0042] [Table 1] 4 (a) to 4 (c) and (Table 1)
Use a double container with the hollow part placed under reduced pressure
When using air as the heating medium,
And flame using electric heater with single container
Compared to the case where combustion regeneration is performed by propagation,
One heating can be realized. FIG. 5 shows an exhaust gas purifying apparatus according to this embodiment.
It is sectional drawing which shows the filter storage double container which comprises.
In FIG. 5, reference numeral 105 denotes introduction of engine exhaust gas and fuel
A passage pipe 107 for exhausting the secondary air for baking regeneration is provided with a fan 107 described later.
Filter storage double container for storing the filter 108, 108
Is a filter having a ceramic honeycomb structure, and 109 is a filter.
Exhaust gas that has passed through the heater 108 and combustion regeneration.
Flow path piping for introducing the secondary air, 114 is the secondary air introduced
An electric heater for heating the air 123 to generate hot air;
2 is engine exhaust gas. Each pipe is resistant
It is preferable to use a stainless steel or the like having corrosion properties.
Further, the filter 108 has a small pressure loss as described above.
A simple honeycomb structure is preferable. Further, the filter 108
At least one may be provided with an oxidation catalyst. Double container 107 containing filter 108
Are two cylindrical metal tubes, ie, an outer metal tube 117.
a, inner cylinder metal tube 117b and metal tube 117a, 117
b two metal rings 117c connecting both ends of b.
117d. Also, the metal tube 117
a, 117b and metal rings 117c, 117d
Each is joined by welding and has a closed structure with a hollow part
Has become. These are corrosion-resistant and heat-resistant stainless steel
It is preferred to be made of steel or the like. The filter housing double constructed as described above.
The function and the like of the container 107 will be described. First, the engine exhaust
122 passes through the filter 108 so that a predetermined amount of
Particulates such as soot are collected by the filter 108
After that, the engine exhaust gas 122 is shut off and the switching valve 1
06, 111 and secondary air for combustion regeneration and
A flow path for the exhaust is secured. Then the particulates
Starts regeneration of the collected filter 108. First,
Combustion regeneration from the secondary air introduction flow passage pipe 109 for combustion regeneration
Raw secondary air 123 is introduced. Secondary air 123 is electric
It is heated by the heater 114 and becomes hot air. This hot air
Sprayed on the filter 108, heating the filter 108
I do. By heating the filter 108 with hot air
Hot air passes through the filter 108 uniformly,
The entire heater 108 is uniformly heated. Further, the storage capacity from the outer peripheral portion of the filter 108 is
The heat that escapes through the vessel is
Insulated by a layer of air to reduce heat escape
it can. As a result, the air collected by the filter 108
Particulates burn uniformly in each part, and filter 10
8 can be reproduced without causing any damage. Ma
When external force such as vibration or impact is applied to the double container 107,
In this case, the external force is absorbed by the outer metal tube 117a and the hollow portion and
Hard to reach the filter 108,
Gives less. As described above, according to the present embodiment, the filter
Filter 108a in a double container having a closed hollow part.
Instead of burning and regenerating by flame propagation, air is used as a heating medium.
And blow this heated air to the filter 108a.
By attaching the filter, the entire filter 108a is efficiently used.
The temperature can be raised without heating.
Particles in the filter 108a
Is due to the continuous ignition (combustion with rapid temperature rise)
It is not combustion but uniform combustion, and
Temperature distribution, temperature gradient is small, filter cracks,
It can be regenerated without erosion. Also Phil
Tab 108a is protected by the double container 107a.
Of the filter 108a due to external shock or vibration
Loss can be prevented and the hollow portion of the double container 107a
Since a heat insulating effect can be expected, the filter 10 can be efficiently regenerated.
8a can be reproduced. For insulation effect by hollow part
As a result, the temperature of the outer peripheral portion of the filter 108a does not decrease,
Reduce the temperature gradient inside the filter 108a, and
And unburned residue is also prevented. (Embodiment 2) FIG. 6 shows a second embodiment.
Shows a double container containing filters that constitutes an exhaust gas purification device
FIG. In FIG.
Filter container double container 107, filter 108, flow path piping 1
09, electric heater 114, engine exhaust gas 122, secondary
The air 123 is the same as in FIG.
The description is omitted. 124 communicates with the hollow part,
When the internal pressure exceeds a predetermined value, the valve automatically
This is a safety valve that releases gas inside the unit to the atmosphere. Also,
Dual container 1 for accommodating filter of FIG. 1 according to the first embodiment.
07a, 107b, filters 108a, 108b, FIG.
Filter storage double container 107 and filter 108
The same thing as described in FIG.
6, the filter storage double container 107 and the filter 108
I can say it. Difference between this embodiment and (Embodiment 1)
Is the safety valve 12 as can be seen from the comparison between FIG. 5 and FIG.
4 only the safety valve 124 is explained.
I do. Density is high at high temperature while heating the filter 108 with hot air.
The gas in the closed hollow expands and its internal pressure rises
You. The safety valve 124 is automatically activated by the increase of the internal pressure.
To release the rising pressure into the atmosphere. This allows the internal pressure
Can be prevented from rising, and container rupture due to internal pressure rise
Etc. can be prevented. As described above, according to the present embodiment, the filter
Sealed hollow part at high temperature during regeneration operation of Luta 108
Safety valve 124 prevents internal pressure rise due to gas inflation
The filter can be stored by increasing the internal pressure.
Burst of the heavy container 107 can be prevented. (Embodiment 3) FIG. 7 shows a third embodiment.
Shows a double container containing filters that constitutes an exhaust gas purification device
FIG. In FIG. 7, the flow path piping 105
Filter container double container 107, filter 108, flow path piping 1
09, electric heater 114, engine exhaust gas 122, secondary
The air 123 is the same as in FIG.
The description is omitted. 125 melts into the outer metal tube 117a.
To reduce the pressure in the hollow space (for example,
This is an intake port for emptying. Also, the embodiment
1, the filter containing double containers 107a, 10a of FIG.
7b, the filters 108a and 108b, and the filters shown in FIG.
What has been said about the double container 107 and the filter 108
Is the same as the filter of FIG.
The same applies to the storage double container 107 and the filter 108.
You. The difference between the present embodiment and the first embodiment is as follows.
As can be seen from a comparison between FIG. 5 and FIG.
Since there is the presence / absence, only the intake port 125 will be described.
You. When the hollow portion is placed under reduced pressure, the air inlet 125
Connect a vacuum pump to^-FourVacuum of about Torr
After reducing the pressure, the inlet 125 is sealed. True at this time
As for the degree of airness, the smaller the degree of vacuum, the better the insulation performance.
Although desirable, due to manufacturing constraints, 10^-1Torr-10
^-6The range of Torr is preferred. A file configured in this way
Filter storage double container 107 is made of metal with corrosion resistance and heat resistance
Preferably, it is made of a material such as stainless steel.
Also, in order to maintain the reduced pressure state in the hollow part,
Prevents deterioration of reduced pressure due to gas generated from metal materials
High temperature conditions (eg hot air temperature)
Heat treatment at 600 ° C or higher when setting to 600 ° C)
Or provide an adsorbent to absorb the evolving gas.
It is preferable to place them. As an example, this adsorbent
An alloy called a cutter material is used. Getter material is zircon
Zirconium-Vanadium-Iron, etc., containing as its main component
Alloy. As described above, according to the present embodiment, the hollow
Since the part can be put in a state of proper decompression, the hollow part
Can be reliably insulated. [0057] As described above, the exhaust gas purifying apparatus of the present invention has
According to the double container with a hollow part closed filter
And blow air as a heating medium to the filter
By heating the entire filter efficiently and evenly
So that the particulates are collected
The particulates become uniform combustion in the filter
The temperature distribution and temperature gradient in the filter are small,
It can be regenerated without cracks and erosion
There are advantageous effects. Also, the filter is a double container
Protected by external shocks and vibrations
It is possible to prevent breakage of the filter and the hollow part of the double container
Since the heat insulation effect can also be expected, the filter can be
There is also obtained an advantageous effect that it can be produced. Further, the double container has a safety part communicating with the hollow part.
By having a valve, high temperature during regeneration operation of the filter
Internal pressure rise due to gas expansion inside the closed hollow
Because it can be prevented by all valves,
Rupture of the double container with filter can be prevented.
The advantageous effect described above can be obtained. [0059]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an exhaust gas purification device according to a first embodiment of the present invention. FIG. 2 is a flowchart showing an operation of combustion regeneration in the exhaust gas purification device of FIG. FIG. 4 (a) is a graph showing the experimental results when using a double container and using air as a heating medium (b). FIG. 5 is a graph showing experimental results when a single container is used and air is used as a heating medium. FIG. 5C is a graph showing experimental results when a single container is used to perform combustion regeneration by flame propagation using an electric heater. FIG. 6 is a cross-sectional view showing a dual filter storage container that forms the exhaust gas purification device according to the first embodiment. FIG. 6 is a cross-sectional view showing a double filter storage container that forms the exhaust gas purification device according to the second embodiment. According to the third embodiment FIG. 8 is a cross-sectional view showing a filter storage double container constituting an exhaust gas purifying apparatus. FIG. 8 is a structural view showing a conventional exhaust gas purifying apparatus. [Description of References] 101 Exhaust gas purifying apparatus 102 Diesel engine 103 Exhaust manifold 104 Upstream exhaust pipe 105 , 105a, 105b, 109, 109a, 10
9b Flow path piping 106, 111 Switching valve 107, 107a, 107b Filter storage double container 108, 108a, 108b Filter 110a, 110b Secondary air supply pipe 112 Secondary air supply pipe 113 Secondary air supply section 114, 114a, 114b Heating parts 115a, 115b Temperature sensor 116 Controller 117a Outer tube metal tube 117b Inner tube metal tube 118a, 118b Release valve 119a, 119b Release tube 121a, 121b Differential pressure sensor 122 Engine exhaust gas 123 Secondary air 124 Safety valve 125 Inlet 130 Hot air inflow Surface 140 Hot air outflow surface

────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI F01N 3/02 F01N 3/02 341R ZAB ZAB (56) References JP-A-7-247826 (JP, A) JP-A 8- 144740 (JP, A) Japanese Utility Model 5-21121 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F01N 3/02

Claims (1)

(1) An exhaust gas purifying apparatus that burns the particulates attached to a filter that captures the particulates in the exhaust gas by allowing the exhaust gas to pass therethrough. A double container, which is a hollow container in which a gap between the outer metal tube and the inner metal tube is a sealed hollow portion, the inner container being made of an inner cylindrical metal tube containing the filter; A heating unit for heating a predetermined flow of air to be introduced and blowing hot air to the filter , wherein the double container is
An exhaust gas purifying apparatus having a safety valve communicating with the hollow portion .