JP3673077B2 - Thermal storage type exhaust gas treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a regenerative exhaust gas that directly burns combustible harmful components and combustible malodorous components contained in exhaust gas to change them into harmless and odorless materials, and recovers the heat generated at that time and reuses it for exhaust gas treatment. The present invention relates to a processing apparatus.
[0002]
[Prior art]
In various facilities such as painting booth, painting drying furnace, printing drying furnace, plastic and plywood manufacturing equipment, food processing equipment, industrial waste processing equipment or fragrance manufacturing equipment, paint, ink, solvent, adhesive, synthesis Combustible harmful odor components such as alcohols, esters, phenols and aldehydes having harmful and specific odors are generated from resins or chemicals.
[0003]
Since the exhaust gas containing such harmful odor components cannot be directly released into the atmosphere from the viewpoint of pollution prevention, it is usually released in a harmless and non-brominated state after purification.
In order to purify such exhaust gas, combustible harmful odor components in the exhaust gas are directly burned or catalytically oxidized to change them into harmless and odorless substances, and the heat generated at that time is recovered to obtain untreated exhaust gas. A heat storage type exhaust gas treatment device which is reused as a heat source for heating the gas has been proposed (see JP-A-5-332523, 332524, and 66005).
Depending on the number of heat storage chambers, there are two types of heat storage type exhaust gas treatment devices, two tower type, three tower type, and multiple tower type, but they remain in the heat storage chamber when each heat storage chamber is switched from the introduction side to the discharge side. In order to continuously treat the exhaust gas without discharging the untreated exhaust gas, a three-column type is preferable (Japanese Patent Laid-Open Nos. 9-152120, 253448, 262434, and 264521).
[0004]
FIG. 4 shows such a three-tower type exhaust gas treatment device 41, which stores heat when discharging a high-temperature treated exhaust gas and dissipates heat stored when introducing a low-temperature untreated exhaust gas. The three heat storage chambers 3A to 3C in which the heat storage layers 2A to 2C for preheating the exhaust gas are communicated with the exhaust gas treatment zone 4 for heating and purifying the untreated exhaust gas to a predetermined temperature. Arranged.
The exhaust gas treatment zone 4 is provided with a burner 5 for heating the untreated exhaust gas, and a catalyst layer 6A for oxidative combustion / thermal decomposition of combustible components contained in the exhaust gas heated by the burner 5 at a relatively low temperature. To 6C are laminated and disposed on the heat storage layers 2A to 2C of the heat storage chambers 3A to 3C.
[0005]
In each of the heat storage chambers 3A to 3C, the untreated exhaust gas introduction ducts 42A to 42C for introducing untreated exhaust gas to the opposite side of the exhaust gas treatment zone 4 across the heat storage layers 2A to 2C, and the exhaust gas treatment zone 4 are purified. Processed exhaust gas exhaust ducts 43A to 43C for discharging the processed exhaust gas, and purge ducts for extruding untreated exhaust gas remaining in the heat storage chambers 3A to 3C with the processed exhaust gas and returning them to the heat storage chambers 3A to 3C on the introduction side 44A to 44C are connected.
[0006]
The untreated exhaust gas introduction ducts 42A to 42C are branched from the main introduction duct 42 that feeds the untreated exhaust gas from the exhaust gas generation source, and the treated exhaust gas exhaust ducts 43A to 43C mainly discharge the exhaust gas to the outside. The purge ducts 44 </ b> A to 44 </ b> C are joined to the main purge duct 44 that communicates with the main introduction duct 42.
The ducts 42A to 42C, 43A to 43C, 44A to 44C are provided with auto dampers 45A to 45C, 46A to 46C, and 47A to 47C, which are opened and closed at a predetermined timing to introduce exhaust gas. The side and the discharge side are alternately switched.
[0007]
Thereby, for example, in the above-mentioned three-column exhaust gas treatment device 41, after introducing untreated exhaust gas from one heat storage chamber 3A (3B, 3C) and purifying it in the exhaust gas treatment zone 4, the treated exhaust gas is treated as other The heat storage chamber 3B (3C, 3A) is discharged and the untreated exhaust gas remaining in the remaining heat storage chamber 3C (3A, 3B) is returned to the introduction side heat storage chamber 3A (3B, 3C) and purged. For each of the heat storage chambers 3A to 3C, by alternately switching in order of discharge of treated exhaust gas (heat storage)-introduction of untreated exhaust gas (radiation)-recirculation (purging) of remaining untreated exhaust gas. It can be purified.
[0008]
[Problems to be solved by the invention]
However, the three-tower type exhaust gas treatment device 41 has a total of nine ducts of untreated exhaust gas introduction ducts 42A to 42C, treated exhaust gas exhaust ducts 43A to 43C, and purge ducts 44A to 44C for each of the heat storage chambers 3A to 3C. Since they must be connected, a large space for the duct is required, and the entire apparatus becomes large.
[0009]
For example, in an actual apparatus, although illustration is abbreviate | omitted, with respect to the bottom part of the three heat storage chambers 3A-3C arranged side by side, exhaust gas introduction ducts 42A-42C are connected from the main introduction duct 42 piped in the front side. The main purge duct is branched and connected from the front side, and the exhaust gas discharge ducts 43A to 43C are branched from the main discharge duct 43 piped on the back side and connected from the back side, and piped on the bottom side. 44, purge ducts 44 </ b> A to 44 </ b> C are branched from each other and connected from the bottom side.
For this reason, the space which pipes each said duct must be ensured before and behind each heat storage chamber 3A-3C, and the apparatus enlarges that much.
[0010]
In addition, since each of the ducts 42A to 42C, 43A to 43C, and 44A to 44C must be provided with auto dampers 45A to 45C, 46A to 46C, and 47A to 47C, it is necessary to secure these installation spaces. In addition, the nine actuators that individually open and close each damper must be driven in synchronism with each other, so that the control is complicated and expensive. is there.
[0011]
Therefore, the first invention of the present application has a technical problem to simplify the handling of each duct in the three-tower type exhaust gas treatment device and to reduce the size of the entire device. In addition, the second invention of the present application aims to reduce the size of the entire apparatus, consolidate a large number of dampers into one, save space, and reduce the equipment cost by eliminating the need for a complicated and expensive control device. Is a technical issue.
[0012]
[Means for Solving the Problems]
In order to solve this problem, the first invention of the present application stores heat when exhausting high-temperature treated exhaust gas, and stores heat to preheat the exhaust gas by dissipating heat when introducing low-temperature untreated exhaust gas. Three heat storage chambers with layers are juxtaposed with an exhaust gas treatment zone for heating and purifying the untreated exhaust gas to a predetermined temperature, and the untreated exhaust gas introduced from one heat storage chamber is treated as the exhaust gas treatment zone. In the heat storage type exhaust gas processing apparatus for exhausting the treated exhaust gas from the other one heat storage chamber and sequentially switching the exhaust gas introduction side and the exhaust side alternately in order, The heat storage chambers are disposed adjacent to each other, and communicate with the bottom of each of the heat storage chambers and extend in parallel toward the bottom of the respective heat storage chambers. Send The main introduction duct, the main exhaust duct that discharges the treated exhaust gas, and the residual untreated exhaust gas discharged from each heat storage chamber is returned to the main introduction duct, or the treated exhaust gas flowing through the main exhaust duct is returned to each heat storage chamber. A main purge duct that circulates; three branch introduction ducts that are branched in three directions from the main introduction duct and connected to the exhaust gas introduction / exhaust ducts; and branched from the exhaust gas introduction / exhaust ducts to the main exhaust duct Three branch discharge ducts joined from three sides and three branch purge ducts branched from each exhaust gas introduction / exhaust duct and joined from the three sides to the main purge duct are vertically moved below the respective heat storage chambers. It is characterized by being piped in layers.
[0013]
According to the present invention, the three heat storage chambers are arranged at positions adjacent to each other, that is, at positions that are substantially triangular vertices when viewed from above, and the exhaust gas introduction / discharge ducts connected to the respective bottom portions face downward. Therefore, each exhaust gas introduction / exhaust duct is erected substantially perpendicular to the position of the apex of the triangle.
[0014]
Each branch introduction duct branched in three directions from the main introduction duct that feeds the untreated exhaust gas from the exhaust gas generation source is connected to each exhaust gas introduction / exhaust duct, and each exhaust gas is introduced into the main exhaust duct that discharges the treated exhaust gas. Three branch exhaust ducts branched from the exhaust duct were joined and connected from three sides, and branched from each exhaust gas introduction / exhaust duct to the main purge duct that recirculates the remaining untreated exhaust gas discharged from each heat storage chamber to the main introduction duct Three branch purge ducts are joined from three sides.
[0015]
These branch introduction ducts, branch discharge ducts, and branch purge ducts can be arranged in three upper and lower layers without crossing each other with respect to the exhaust gas introduction / exhaust ducts. Therefore, the installation space of the entire apparatus can be reduced and the size can be reduced.
[0016]
Further, the second invention of the present application arranges branch junctions of each branch introduction duct, each branch discharge duct and each branch purge duct, and the main introduction duct, main discharge duct and main purge duct coaxially in the vertical direction, If an auto damper is provided at the branch junction to switch the three flow paths of each branch introduction duct, each branch discharge duct, and each branch purge duct at the same time, a single damper and its drive unit are sufficient, and the installation space for the auto damper is small. Not only does this work, it's very easy to control.
[0017]
For example, an auto cylinder comprising a rotating cylinder in which each branch introduction duct, each branch discharge duct, and each branch purge duct are branched or merged equiangularly in three directions with three switching flow paths formed around an auto damper. If the damper is used, by rotating the rotary cylinder by 120 °, the branch introduction duct communicating with one exhaust gas introduction / exhaust duct among the branch introduction ducts is selectively brought into conduction with the main introduction duct. The branch discharge duct that communicates with the other exhaust gas introduction / exhaust duct is selectively connected to the main exhaust duct, and the branch purge duct that communicates with the remaining exhaust gas introduction / exhaust duct among the branch purge ducts is selectively selected as the main purge duct. Can be conducted.
Therefore, if this is rotated 120 ° at a time, the exhaust of treated exhaust gas (storage)-introduction of untreated exhaust gas (heat release)-recirculation (purging) of residual untreated exhaust gas is repeated for each heat storage chamber. Exhaust gas treatment is performed.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a heat storage type exhaust gas treatment apparatus according to the present invention, FIGS. 2A to 2C are piping diagrams showing a channel switching operation, and FIG. 3 is a channel switching of another embodiment. It is a piping diagram showing an example of operation. In addition, the same code | symbol is attached | subjected about the part which is common in FIG.
[0019]
In the heat storage type exhaust gas treatment apparatus 1 according to this example, the three heat storage chambers 3A to 3C are arranged at positions adjacent to each other, that is, at positions where the apexes of the triangle are seen from the plane.
By adopting such an arrangement, the adjacent heat storage chambers 3A to 3C can be brought into close contact with each other. In this case, it is only necessary to partition the heat storage chambers 3A to 3C with a heat insulating wall. Cost can be reduced.
Further, if the heat storage chambers 3A to 3C are arranged in close contact with each other, the portions adjacent to each other are not exposed to the outside air, so the amount of heat radiation is small, and the thermal efficiency is improved accordingly.
Further, the heat storage chambers 3A to 3C are respectively connected with exhaust gas introduction / exhaust ducts 7A to 7C extending in parallel downward from the bottom of the heat storage chambers 3A to 3C. .
[0020]
The exhaust gas introduction / discharge ducts 7A to 7C are discharged from the main introduction duct 8 for supplying untreated exhaust gas from the exhaust gas generation source, the main discharge duct 9 for discharging the treated exhaust gas, and the heat storage chambers 3A to 3C. The remaining untreated exhaust gas is communicated with a main purge duct 10 that recirculates the remaining untreated exhaust gas to the main introduction duct 8.
[0021]
The main introduction duct 8 is connected to each of the exhaust gas introduction / discharge ducts 7A to 7C via three branch introduction ducts 8A to 8C branched from the duct 8 in three directions.
Further, to the main discharge duct 9, three branch discharge ducts 9A to 9C branched from the exhaust gas introduction / discharge ducts 7A to 7C are joined and connected from three sides.
Furthermore, three branched purge ducts 10A to 10C branched from the exhaust gas introduction / discharge ducts 7A to 7C are joined and connected to the main purge duct 10 from three directions.
[0022]
The main introduction duct 8, the main discharge duct 9, and the main purge duct 10 are extended to the inside of a triangle with the exhaust gas introduction / exhaust ducts 7A to 7C extending below the heat storage chambers 3A to 3C as vertices, The branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C, and the branch purge ducts 10A to 10C are branched and joined.
The branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C, and the branch purge ducts 10A to 10C are connected to the exhaust gas introduction / exhaust ducts 7A to 7C in three upper and lower layers.
[0023]
Further, branch junctions P of the branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C and the branch purge ducts 10A to 10C and the main introduction duct 8, the main discharge duct 9 and the main purge duct 10 are coaxially arranged vertically. At the branch junction point P, there is disposed an auto damper 11 that simultaneously switches the three flow paths of the branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C, and the branch purge ducts 10A to 10C.
[0024]
With the auto damper 11 as the center, the branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C, and the branch purge ducts 10A to 10C are branched or merged equiangularly in three directions.
The auto damper 11 is provided with a rotating cylinder 13 (see FIG. 2) that is rotated by a motor 12 by 120 °.
[0025]
As shown in FIG. 2, the rotary cylinder 13 has a branch introduction duct 8A that communicates with one exhaust gas introduction / discharge duct 7A (7B, 7C) among the branch introduction ducts 8A to 8C when rotated by 120 °. (8B, 8C) is selectively connected to the main introduction duct 8 and the switching flow path 14in, and the branch discharge that communicates with the other exhaust gas introduction / discharge duct 7B (7C, 7A) among the branch discharge ducts 9A to 9C. A switching flow path 14out that selectively connects the duct 9B (9C, 9A) to the main discharge duct 9 and a branch purge duct that communicates with the remaining exhaust gas introduction / discharge duct 7C (7A, 7B) among the branch purge ducts 10A to 10C. A switching flow path 14p that selectively connects 10C (10A, 10B) to the main purge duct 10 is formed.
[0026]
Reference numeral 15 denotes a blower fan interposed in the main introduction duct 8, and the main purge duct 10 is connected to the upstream side of the blower fan 15.
[0027]
The above is an example of the configuration of the present invention, and its operation will be described next with reference to FIGS.
When the rotary cylinder 13 of the auto damper 11 is at the position shown in FIG. 2A, the main introduction duct 8 is conducted to the branch introduction duct 8A via the switching flow path 14in, and the branch discharge duct 9B is switched to the switching flow path 14out. Is connected to the main discharge duct 9, and the branch purge duct 10C is connected to the main purge duct 10 via the switching flow path 14p.
[0028]
Therefore, the untreated exhaust gas fed through the main introduction duct 8 is introduced into the heat storage chamber 3A through the exhaust gas introduction / exhaust duct 7A, and the high-temperature treated exhaust gas treated in the exhaust gas treatment zone 4 passes through the heat storage chamber 3B. In this case, the heat is stored in the heat storage layer 2B and is discharged to the outside through the exhaust gas introduction / discharge duct 7B-branch discharge duct 9B-switching flow path 14out-main discharge duct 9.
[0029]
At this time, the heat storage chamber 3C is purged, and the residual untreated exhaust gas pushed out by the treated exhaust gas passes through the exhaust gas introduction / exhaust duct 7C-branch purge duct 10C-switching flow path 14p-main purge duct 10 and passes through the main introduction duct 8. And then recirculated into the exhaust gas treatment zone 4 on the introduction side.
[0030]
Next, when the motor 12 rotates the rotary cylinder 13 of the auto damper 11 by 120 ° to the position shown in FIG. 2B, the main introduction duct 8 is conducted to the branch introduction duct 8B via the switching flow path 14in and branched and discharged. The duct 9C is conducted to the main discharge duct 9 via the switching flow path 14out, and the branch purge duct 10A is conducted to the main purge duct 10 via the switching flow path 14p.
Thereby, untreated exhaust gas is introduced from the heat storage chamber 3B where heat storage is completed and preheated, and the treated exhaust gas processed in the exhaust gas treatment zone 4 is discharged from the heat storage chamber 3C where purge is completed, and the heat storage chamber 3A is The remaining untreated exhaust gas is purged to the introduction side heat storage chamber 3B.
[0031]
Further, when the motor 12 rotates the rotary cylinder 13 of the auto damper 11 to the position shown in FIG. 2 (c) by 120 °, the main introduction duct 8 is conducted to the branch introduction duct 8C via the switching flow path 14in and branched and discharged. The duct 9A is conducted to the main discharge duct 9 via the switching flow path 14out, and the branch purge duct 10B is conducted to the main purge duct 10 via the switching flow path 14p.
Thereby, untreated exhaust gas is introduced and preheated from the heat storage chamber 3C where heat storage is completed, and the treated exhaust gas treated in the exhaust gas treatment zone 4 is discharged from the heat storage chamber 3A after purging, and the heat storage chamber 3B The remaining untreated exhaust gas is purged to the introduction side heat storage chamber 3C.
[0032]
In this way, the rotary cylinder 13 is rotationally driven by 120 ° by the motor 12, and the flow paths of the branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C, and the branch purge ducts 10A to 10C are sequentially switched. In each heat storage chamber 3A to 3C, exhaust gas treatment can be performed continuously by repeating discharge of exhausted gas (heat storage)-introduction of untreated exhaust gas (radiation)-recirculation (purging) of residual untreated exhaust gas. .
[0033]
In addition, not only when providing one auto damper 11 at the branch junction P, a plurality of auto dampers are provided for each branch introduction duct 8A to 8C, each branch discharge duct 9A to 9C, and each branch purge duct 10A to 10C. It may be the case.
In this case, the number of installed dampers is the same as the conventional one, but the piping space is narrowed by piping the branch introduction ducts 8A to 8C, the branch discharge ducts 9A to 9C, and the branch purge ducts 10A to 10C in three layers. In addition, since each auto damper can be arranged three-dimensionally, the installation space is reduced, and the entire apparatus can be reduced in size.
[0034]
Further, the main purge duct 10 is not limited to recirculating the residual untreated exhaust gas pushed out from the heat storage chambers 3A to 3C to the main introduction duct 8, but each treated exhaust gas flowing through the main exhaust duct 9 as shown in FIG. The heat storage chambers 3 </ b> A to 3 </ b> C may be supplied to push the remaining untreated exhaust gas in the heat storage chambers 3 </ b> A to 3 </ b> C into the exhaust gas treatment zone 4.
In this case, the blower fan 15 is interposed in the main discharge duct 9, the main purge duct 10 is branched from the downstream side, and is connected to the branch purge ducts 10 </ b> A to 10 </ b> C via the auto damper 11.
[0035]
Furthermore, although the case where the catalyst layers 6A to 6C are disposed in the exhaust gas treatment zone 4 has been described, it is needless to say that the present invention can be applied to a direct combustion type exhaust gas treatment device without the catalyst layers 6A to 6C.
[0036]
【The invention's effect】
As described above, according to the present invention, the three heat storage chambers are disposed at positions adjacent to each other, and the exhaust gas introduction / exhaust duct is extended below the three heat storage chambers, and branched in three directions from the main introduction duct. Three branch introduction ducts, three branch discharge ducts joined from three sides to the main discharge duct, and three branch purge ducts joined from three sides to the main purge duct are connected to the exhaust gas introduction / exhaust duct. On the other hand, since the pipes are arranged in three upper and lower layers, if there is an installation space for the heat storage chamber, it is possible to perform the piping underneath it, and therefore, it is possible to reduce the installation space for the entire apparatus, which is an excellent effect. .
In addition, if the three heat storage chambers are arranged closely, the adjacent heat insulating walls can be shared, so that the material cost can be saved, and at the same time, the portion exposed to the outside air is reduced. There is also an effect that thermal efficiency is improved.
[0037]
Further, the branch junctions of each branch introduction duct, each branch discharge duct and each branch purge duct, and the main introduction duct, main discharge duct and main purge duct are arranged coaxially in the vertical direction, and each branch is arranged at the branch junction. If an auto damper is provided that switches between the three flow paths of the introduction duct, each branch discharge duct, and each branch purge duct at the same time, only one damper and its drive device are required, and not only the installation space for the damper is reduced, but also the control thereof. It becomes extremely simple, and there is an effect that the equipment cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing a heat storage type exhaust gas treatment apparatus according to the present invention.
FIGS. 2A to 2C are piping diagrams showing flow path switching operations;
FIG. 3 is a piping diagram illustrating an example of a flow path switching operation according to another embodiment.
FIG. 4 is a schematic explanatory view showing a conventional apparatus.
[Explanation of symbols]
1 ... Thermal storage type exhaust gas treatment devices 2A-2C ... Thermal storage layers 3A-3C ... Thermal storage chamber 4 ... Exhaust gas treatment zone 5 ... Burner 6A ~ 6C ... catalyst layer 7A ~ 7C ... exhaust gas introduction and discharge duct 8 ... main introduction duct 8A ~ 8C ... branch introduction duct 9 ... ... main discharge duct 9A ~ 9C: Branch discharge duct 10 ... Main purge duct 10A to 10C ... Branch purge duct 11 ... Auto damper 13 ... Rotary cylinders 14in, 14out, 14p・ Switching channel

Claims (3)

Three heat storage chambers (3A to 2C) with heat storage layers (2A to 2C) that store heat when exhausting high-temperature treated exhaust gas and dissipate heat to preheat the exhaust gas when introducing low-temperature untreated exhaust gas ~ 3C) is juxtaposed to the exhaust gas treatment zone (4) for heating and purifying the untreated exhaust gas to a predetermined temperature, and the untreated exhaust gas introduced from one heat storage chamber (3A to 3C) After purifying in the exhaust gas treatment zone (4), the treated exhaust gas is discharged from the other heat storage chamber (3A-3C), and the exhaust gas introduction side and the exhaust side are switched alternately one after the other and processed continuously In a heat storage type exhaust gas treatment device that performs
Each of the heat storage chambers (3A to 3C) is disposed at a position adjacent to each other, and communicates with the bottom of each of the heat storage chambers (3A to 3C) and extends in parallel toward the lower side thereof. Exhaust duct (7A to 7C), main introduction duct (8) for delivering untreated exhaust gas from the exhaust gas source, main exhaust duct (9) for discharging treated exhaust gas, and each heat storage chamber (3A to 3C) The main purge duct (10) for returning the residual untreated exhaust gas discharged from the exhaust gas to the main introduction duct (8) or returning the treated exhaust gas flowing through the main discharge duct (9) to each heat storage chamber (3A to 3C) Prepared,
Three branch introduction ducts (8A-8C) branched in three directions from the main introduction duct (8) and connected to the exhaust gas introduction / exhaust ducts (7A-7C), and each exhaust gas introduction / exhaust duct (7A- 7C) and three branch discharge ducts (9A to 9C) joined and connected to the main discharge duct (9) from three directions, and the exhaust gas introduction / discharge ducts (7A to 7C) branched from the main discharge duct (9). Heat storage type exhaust gas characterized in that three branched purge ducts (10A to 10C) joined and connected to the purge duct (10) from three directions are piped in three layers above and below the heat storage chambers (3A to 3C). Processing equipment. Each branch introduction duct (8A to 8C), each branch discharge duct (9A to 9C) and each branch purge duct (10A to 10C), main introduction duct (8), main discharge duct (9) and main purge duct (10) The branch junction (P) is coaxially arranged vertically, and at each branch junction (P), each branch introduction duct (8A-8C), each branch discharge duct (9A-9C), and each branch purge duct The regenerative exhaust gas treatment apparatus according to claim 1, further comprising an auto damper (11) for simultaneously switching the three flow paths (10A to 10C). Each branch introduction duct (8A to 8C), each branch discharge duct (9A to 9C) and each branch purge duct (10A to 10C) are centered on the auto damper (11) arranged at the branch junction (P). The auto damper (11) is equilaterally branched or joined in three directions, and the auto damper (11) includes a rotating cylinder (13) that switches each flow path when rotated by 120 °, and the rotating cylinder (13) includes: The branch introduction duct (8A to 8C) communicating with one exhaust gas introduction / discharge duct (7A to 7C) of each branch introduction duct (8A to 8C) is selectively brought into conduction with the main introduction duct (8), and each branch discharge is performed. The branch discharge duct (9A-9C) communicating with the other exhaust gas introduction / discharge duct (7A-7C) among the ducts (9A-9C) is selectively brought into conduction with the main discharge duct (9), and each branch purge duct ( Branch purge duct communicating with the remaining exhaust gas introduction / exhaust duct (7A-7C) Three switching flow path for selectively conducting (1OA - 1OC) and the main Pajidakuto (10) (14in, 14out, 14p) is regenerative exhaust gas treating apparatus according to claim 2, wherein comprising formed.

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