JP2008207097A - Exhaust gas purification apparatus, regeneration method of exhaust gas purification apparatus and exhaust gas purification method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas purification apparatus which attains the uniform availability of purification members for purifying exhaust gas, to provide a regeneration method of an exhaust gas purification apparatus and to provide an exhaust gas purification method. <P>SOLUTION: In the exhaust gas purification apparatus 10 to purify a toxic substance in the exhaust gas by using a purification unit 13 where the purification members 12 are plurally charged in a pallet 11, it is characterized by arranging the purification unit in approximately V letter configuration so that the opening part is formed in correspondence with the profile X of the flow rate distribution of the exhaust gas 14 detected at the entrance of the apparatus itself. As one embodiment, before and after of the gas inflow and discharge of the apparatus itself that arranges the purification unit 13, the exhaust gas purification apparatus is provided with an expansion tube 12a communicating with a flue 12 at the entrance side of the apparatus and a shrinkage tube 12b communicating with the flue 12 at the exit side of the apparatus. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an exhaust gas purifying apparatus that removes nitrogen dioxide (NO ₂ ) in particular from nitrogen oxides (NOx) contained in exhaust gas discharged from automobiles, for example, in tunnels and intersections, a method for regenerating the exhaust gas purifying apparatus, and The present invention relates to an exhaust gas purification method.

  For example, exhaust gas from automobiles (hereinafter simply referred to as exhaust gas) contains low-concentration nitrogen oxides, which are health hazards. Especially in places such as tunnels and intersections, the concentration of nitrogen dioxide in the nitrogen oxides May exceed the reference value. Therefore, technology development relating to diffusion and removal of nitrogen oxides in exhaust gas, particularly nitrogen dioxide, has been promoted, and the technology of a denitration apparatus for treating nitrogen dioxide in exhaust gas with an adsorbent is well known.

FIG. 8 shows a conventional adsorbent filling structure of the denitration apparatus. As shown in FIG. 8, in the conventional purification apparatus 100, a purification unit 103 in which a plurality of filters 102 such as an adsorbent are filled in the apparatus main body 101 is perpendicular to the inflow direction of the exhaust gas 105 introduced by the flue 102. In addition, there has been proposed a device arranged in a zigzag shape for each vertical row (Patent Document 1).
Here, the removal of NO ₂ in the exhaust gas is an absorbent carrying alkali, an adsorbent that performs exhaust gas adsorption, and the like, which have shapes such as pellets and honeycombs, and the purification unit is filled with these.

JP 2006-122873 A

  However, for the purpose of suppressing the volume of the apparatus, the filter such as the adsorbent is installed with the filter 102 at an angle of not more than a right angle to the exhaust gas flow, but the exhaust gas flow velocity varies depending on the position of the filter 102, That is, there is a problem that the utilization rate varies depending on the flow rate of exhaust gas passing through. As a result, the breakthrough time varies depending on the position of the filter, and the overall breakthrough time is reduced.

In particular, as shown in FIG. 8, the apparatus main body 101 requires a larger cross-sectional area than the flue 102, so that the apparatus inlet communicating with the flue 102 has an expanded tube 102 a structure, while the apparatus outlet is a contracted tube. In order to obtain the 102b structure, as shown in FIG. 9, a flow velocity distribution is generated between a slow portion and a fast portion of the exhaust gas 105 in the H direction (vertical direction in FIG. 8).
In particular, as shown in FIG. 9, the flow rate of the filter of the purification unit 103 located in the vicinity of the end of the apparatus main body is usually slowed down in the apparatus main body 101. While the breakthrough time is increased, the breakthrough time is shortened in the central portion, and the entire filter cannot be broken through uniformly, and there is a problem that the breakthrough time is reduced as a purification device.
In order to regenerate the catalyst, all the filters are extracted and replaced after a lapse of a predetermined time, so that a uniform utilization rate is required.

In addition, the filter that is an absorbent is filled with, for example, 20 to 40 purification units, and the purification unit is housed in a zigzag shape in the apparatus main body, so it takes time to replace the filter. There is a problem.
In particular, when an exhaust gas purification device is installed in a tunnel, there is a problem that it is a narrow space and it is difficult to efficiently replace a large amount of filters.
Moreover, since the filter 102 with which the purification | cleaning unit 103 is filled is abundant and the replacement time has restrictions, the quick replacement | exchange is requested | required.

  In view of the above problems, an object of the present invention is to provide an exhaust gas purification device, a regeneration method of an exhaust gas purification device, and an exhaust gas purification method that can achieve a uniform utilization rate of a purification member when purifying exhaust gas. To do.

  A first invention of the present invention for solving the above-described problem is an exhaust gas purification apparatus that purifies harmful substances in exhaust gas by using a purification unit in which a plurality of purification members are filled in a pallet, the exhaust gas purification An exhaust gas purifying apparatus in an enclosed space is characterized in that a purification unit is disposed so as to form an opening corresponding to a profile of the flow velocity distribution of the exhaust gas detected at the inlet of the apparatus.

  According to a second invention, in the first invention, a rectifying plate is disposed on the inlet side of the exhaust gas purifying device, and the profile of the flow velocity distribution is adjusted using the rectifying plate. It is in the exhaust gas purification device.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, there is provided an exhaust gas purifying apparatus in an enclosed space, wherein at least a part of the exhaust gas inlet portion or the exhaust gas outlet portion of the purification member through which the exhaust gas passes is covered with a resistor. is there.

  A fourth invention is characterized in that, in any one of the first to third inventions, the purification unit is a substantially V-shape formed by combining four units and forming an opening on the exhaust gas inflow direction side. It is in the exhaust gas purification device in the enclosed space.

  According to a fifth invention, in any one of the first to third inventions, the purification member is a honeycomb-like filter or exhaust gas adsorbing pellet filling carrying an exhaust gas removal catalyst. It is in the exhaust gas purification device.

  According to a sixth invention, in any one of the first to fifth inventions, the exhaust gas is exhaust gas of an automobile, etc., and exhaust gas purification in a sealed space of a tunnel or an underground parking lot is performed and a purification unit is disposed. Before and after gas inflow and discharge of the apparatus main body, the apparatus for purifying exhaust gas in an enclosed space has an expanded pipe communicating with the flue on the apparatus inlet side and a contracted pipe communicating with the flue on the apparatus outlet side It is in.

  According to a seventh aspect of the present invention, the component carried on the purification member is an alkaline component, and at the time of removing nitrate and sulfate produced in the filter by washing with water, at least two systems of purification units are prepared, and the purification units are alternately arranged. There is a method for regenerating an exhaust gas purifying apparatus characterized in that it is regenerated.

  According to an eighth aspect of the present invention, there is provided an exhaust gas purification apparatus using the exhaust gas purification apparatus according to any one of the first to sixth aspects, wherein the central and outer purification units in the apparatus main body are alternately replaced during use. The exhaust gas purification method used is.

  A ninth aspect of the invention uses any one of the first to sixth exhaust gas purification apparatuses, and the purification units in the apparatus main body are installed before and after the inflow direction of the exhaust gas of two or more series groups. The exhaust gas purifying method is characterized in that the position of the exhaust gas is exchanged.

  According to the present invention, since the filter filled in the purification unit can be used uniformly, the breakthrough time becomes uniform, the breakthrough time of the entire purification device becomes long, and it continues for a long time. Thus, exhaust gas purification can be performed.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

An exhaust gas purification apparatus in an enclosed space according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram illustrating an exhaust gas purifying device in a sealed space according to an embodiment.
As shown in FIG. 1, the exhaust gas purifying apparatus 10 according to the present embodiment includes a purification member (for example, a honeycomb filter) 12 in a pallet (not shown: see FIG. 2-2 described later). An exhaust gas purification apparatus in a sealed space that purifies harmful substances in exhaust gas using a plurality of purification units 13 that are filled with a gas flow rate profile X of the flow rate distribution of the exhaust gas 14 detected at the inlet of the apparatus body 11. Correspondingly, the purification unit is arranged in a substantially V shape so as to form the opening.
In the present embodiment, before and after the gas inflow and discharge of the apparatus main body 11 in which the purification unit 13 is disposed, the apparatus inlet side has the expanded pipe 12a communicating with the flue 12, and the apparatus outlet side communicates with the flue 12. It has a contraction tube 12b.

In FIG. 1, a substantially V shape having an exhaust gas inflow portion side as an opening from the first to fourth purification units 13-1 to 13-4 is configured in the apparatus main body 11.
As a result, the substantially horizontal V shape corresponding to the gas flow velocity profile X of the flow velocity distribution of the exhaust gas 14 detected at the inlet of the apparatus main body 11 makes the flow of the exhaust gas flowing into the filter uniform and breaks the filter. The overtime can be made uniform.
The purification unit is arranged so that the purification units 13-1 to 13-4 have a predetermined angle by using a unit locking member 16 at an angle 15 in the apparatus main body 11.
In the present embodiment, four purification units are combined with four units 13-1 to 13-4 in the apparatus main body 11, but in accordance with the exhaust gas treatment amount, a substantially V-shaped one having this basic configuration is used. You may make it comprise a large-scale exhaust gas purification apparatus by arbitrarily providing up and down or front and back, right and left, and these combination with 2 groups or 3 groups.

As shown in FIG. 2-1, the purification member 12 is a honeycomb-shaped filter, and a plurality (20 in this embodiment) of pallets 22 opened at the lower end side shown in FIG. 2-2 are filled. The purification unit 13 is configured.
The pallet 22 is provided with a handle 23 on a side wall in the longitudinal direction so that the pallet 22 can be easily inserted and removed through the unit locking member 16 when inserted into the apparatus main body 11.

  As a result, according to the exhaust gas purification apparatus 10 according to the present embodiment, the purification unit 13 has a plurality of substantially V shapes according to the gas flow velocity profile X of the inlet portion of the gas flow of the exhaust gas 14, thereby Unlike the conventional apparatus having a zigzag shape in a single vertical row, the gas flow is homogenized and the gas is uniformly distributed throughout the purification unit. As a result, the exhaust gas 14 reaches all of the filters filled in the purification unit 13. Gas can flow into each honeycomb constituting the filter. As a result, the deterioration of the filter as the purification member becomes uniform, and the gas can be purified using all the filters until the filter life of the purification member 12.

  Further, as shown in FIG. 3, by installing a gas rectifying plate 31 in the vicinity of the exhaust gas inlet in the apparatus main body 11 of the exhaust gas purification apparatus 10, the exhaust gas goes evenly to the purification units 13-1 to 13-4. Further, the deterioration of the filter as the purification member becomes uniform, and the gas can be purified using all the filters until the filter life of the purification member 12 is reached.

Further, the shape, such as the direction and length of the gas rectifying plate 31, may be selected as appropriate in consideration of both the rectification ratio of the exhaust gas 13 and the pressure loss.
As a result, the flow velocity of the exhaust gas 14 with respect to each purification unit 13 can be made constant regardless of the installation position, and the utilization rate of the purification member can be made uniform. As a result, the life of the purification member can be made uniform.
Therefore, compared with the case where the breakthrough time of the purification member is long or short as in the prior art, the purification member can be used to purify the gas, and the purification time can be extended.

  Further, as shown in FIG. 4, a part of the metal mesh 32 which is a gas suppressing member for suppressing gas discharge such as a metal mesh is provided on the gas outlet side of the purification member 12 of the purification unit 13 (only half of the purification unit in this embodiment). ), The ratio of the gas pressure loss of the exhaust gas is changed between the portion where the wire mesh 32 is not installed, and the exhaust gas flowing into the purification unit is made uniform.

  In the present embodiment, the gas suppression member 32 is provided on the gas discharge side. However, the present invention is not limited to this, and by providing the wire mesh 32 on a part of the gas inlet side, the gas suppression member 32 is provided. It is also possible to make the gas flow of exhaust gas to one purification unit uniform by changing the ratio of the gas pressure loss to the portion where no member is installed.

Further, the opening of the wire mesh 32, the wire diameter, and the like can be selected in consideration of both rectification and pressure loss. Furthermore, the mesh opening may be appropriately changed according to the gas inflow distribution.
As a result, the flow velocity of the purification member 12 can be made constant regardless of the gas passage position, and the utilization rate of the purification member 12 can be made uniform. As a result, the life of the purification member can be made uniform.

Moreover, the exhaust gas purification apparatus 40 shown in FIG. 5 is provided in the apparatus main body 41 in two stages of the exhaust gas purification apparatus 10 shown in FIG.
In this embodiment, the device since the unit hook member 16 which is placed in an angle in the main body 41 is positioned in the center portion of the inflow direction of the exhaust gas, the gas flow rate of the inlet portion of the exhaust gas profile X ₁ and X ₂ The rectifying effect of the gas of the exhaust gas 14 according to the above will be exhibited.

FIG. 6 is a perspective view of the exhaust gas purification device 40. The device main body 41 is provided with double doors 42a and 42b on the side surfaces thereof, so that the purification unit 13 can be easily taken in and out.
That is, when purifying the exhaust gas in the tunnel, the installation space of the exhaust gas purification device is a narrow space, and in order to efficiently replace the purification unit, doors 41a and 41b are provided on the side wall side of the device body 41, The handle 23 shown in FIG. 2-2 is used to slide in and out of the rail-like locking member 16 provided in the apparatus, thereby making it easy to put in and out.
In addition, the code | symbol 41c in a figure is a gas inflow part.

  In addition, the installation of the purification member 12 as shown in FIG. 2 on the locking member 16 which is a frame in the apparatus main body 41 with respect to the pallet 22 accommodates the pallet 22 by sliding the pallet 22 from its end portion. Can be performed quickly.

  Further, a frame in which the plurality of purification units 13 are installed in advance may be moved into the apparatus main body 41. The frame may be added with a function of suppressing slip resistance such as a caster.

  Also. The palletized purification unit 13 preferably has a weight that can be carried by human power (approximately 15 to 20 kg).

Moreover, the exhaust gas purification apparatus 50 shown in FIG. 7 is provided with the layout of the exhaust gas purification apparatus 10 shown in FIG. 1 in the apparatus main body 51 using eight purification units 13-1 to 13-8.
In the present embodiment, since the apparatus main body 51 has a large substantially V shape, the portion where the flow velocity at the center of the exhaust gas 14 is high is the innermost side of the apparatus main body 51 according to the gas flow rate profile X at the inlet of the apparatus main body. Therefore, the exhaust gas 14 can flow uniformly into the entire purification unit.
In this way, by arbitrarily arranging a plurality of purification units that can be taken in and out of the apparatus main body 51, the layout can be appropriately changed according to the gas flow rate profile X of the exhaust gas inflow.

  In addition, when the component carried on the filter, which is a purification member, is an alkaline component, at least two systems of purification units are prepared in order to remove nitrates and sulfates adhering to the filter by washing with water. It is possible to perform exhaust gas treatment continuously by regenerating to the above.

  In addition, the purification unit 13 on the center side and the outer periphery side in the apparatus main body 51 may be alternately replaced during use so that the purification member is evenly broken.

  Further, two or more groups of purification units in the apparatus main body 11 may be installed before and after the inflow direction of the exhaust gas 14 so that the positions before and after the inflow exhaust gas 14 are exchanged during use.

Further, the replacement of the purification member 12 constituting the purification unit 13 for regeneration is preferably performed as follows.
1) For example, three unit groups of ABC are configured, and first, a group A unit and a group B unit are used for gas purification. In this case, the group C unit is regenerated and then stored in the storage space.
2) Next, when regenerating the purification member 12 of the A group unit, the B group unit and the C group unit are used for gas purification. Then, the purification member 12 of the group A unit is regenerated and then stored in the storage space.
3) Next, when regenerating the purification member 12 of the B group unit, the C group unit and the A group unit are used for gas purification. Then, the purification member 12 of the group B unit is regenerated and then stored in a storage space.
Thus, the utilization efficiency of a purification | cleaning unit can be improved by always making one unit group into a dormant state after reproducing | regenerating.

  In addition, although such exchange depends on the state of gas purification, by setting it once or twice a year, or twice or three times in two years, the exhaust gas purification device can be used for 15 to 20 years. Furthermore, the life can be extended over a long period of 25 years, and the gas purification can be continuously performed without intermediate stage for a long period of time.

  In the present invention, the sealed space refers to a closed space such as a tunnel or a parking lot where exhaust gas is generated from an automobile, etc., but the exhaust gas purification device, the exhaust gas purification method, and the regeneration method of the exhaust gas purification device according to the present invention are The present invention can also be applied when removing exhaust gas at intersections.

  As described above, according to the exhaust gas purifying apparatus according to the present invention, when purifying gas, it is possible to achieve a uniform utilization rate of the purification member. Thus, it is suitable for gas purification.

It is the schematic of the exhaust gas purification apparatus which concerns on an Example. It is a perspective schematic diagram of the purification member concerning an example. It is a perspective schematic diagram of the purification unit concerning an example. It is the schematic of the other exhaust gas purification apparatus which concerns on an Example. It is the schematic of the other purification | cleaning unit which concerns on an Example. It is the schematic of the other exhaust gas purification apparatus which concerns on an Example. It is a perspective schematic diagram of other exhaust gas purification devices concerning an example. It is the schematic of the other exhaust gas purification apparatus which concerns on an Example. It is the schematic of the exhaust gas purification apparatus which concerns on a prior art. It is a flow velocity distribution map of exhaust gas.

Explanation of symbols

10, 40, 50 Exhaust gas purification device 11, 41, 51 Device body 12 Purification member (for example, honeycomb-shaped filter)
13 Purification unit 14 Exhaust gas

Claims (9)

An exhaust gas purification device that purifies harmful substances in exhaust gas using a purification unit comprising a plurality of purification members packed in a pallet,
An exhaust gas purification apparatus in an enclosed space, wherein a purification unit is disposed so as to form an opening corresponding to a profile of a flow rate distribution of exhaust gas detected at an inlet of the exhaust gas purification apparatus. In claim 1,
An exhaust gas purification apparatus in an enclosed space, wherein a flow straightening plate is disposed on an inlet side of the exhaust gas purification apparatus, and a profile of a flow velocity distribution is adjusted using the flow straightening plate. In claim 1 or 2,
An exhaust gas purifying apparatus in an enclosed space, wherein at least a part of an exhaust gas inlet portion or an exhaust gas outlet portion of a purification member through which exhaust gas passes is covered with a resistor. In any one of Claims 1 thru | or 3,
An exhaust gas purification apparatus in an enclosed space, wherein the purification unit is formed by combining four units, and has an approximately V-shape formed with an opening on the exhaust gas inflow direction side. In any one of Claims 1 thru | or 3,
An exhaust gas purifying apparatus in an enclosed space, wherein the purifying member is a honeycomb-like filter or exhaust gas adsorbing pellet filling carrying an exhaust gas removing catalyst. In any one of Claims 1 thru | or 5,
The exhaust gas is exhaust gas of automobiles, etc., and purifies exhaust gas in a sealed space of a tunnel or underground parking lot,
Before and after the gas inflow and discharge of the apparatus main body in which the purification unit is disposed, the apparatus inlet side has an expanded pipe communicating with the flue, and the apparatus outlet side has a contracted pipe communicating with the flue. Exhaust gas purification device in space. The component carried on the purification member is an alkali component, and when removing nitrate and sulfate produced in the filter by washing with water,
A method of regenerating an exhaust gas purification apparatus, comprising preparing at least two systems of purification units and alternately regenerating them in units of purification units. Using the exhaust gas purification device according to any one of claims 1 to 6,
An exhaust gas purification method using an exhaust gas purification device, wherein the central and outer peripheral purification units in the apparatus main body are alternately replaced during use. Using the exhaust gas purification device according to any one of claims 1 to 6,
An exhaust gas purification method characterized in that two or more groups of purification units in the apparatus main body are installed before and after the inflow direction of exhaust gas, and the front and rear positions of the inflowing exhaust gas are exchanged during use.

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