JP2006233846A - Exhaust gas treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved exhaust gas treatment device capable of easily exchanging a specific filter device (crossing honeycomb) by fewer people (or one person), without using a machine such as a crane. <P>SOLUTION: The exhaust gas treatment device has a reactor 2 disposed to an exhaust gas duct 1 to be detachable. The reactor 2 comprises: a filter device 5 in which a pair of a porous corrugated plate 3 and a porous flat plate 4 carrying an exhaust gas cleaning catalyst thereon is a base unit, molded bodies formed by laminating the porous corrugated plates so that corrugated plate ridge line of the porous corrugated plates are laminated alternately orthogonal, one face of side faces orthogonal to the corrugated plate ridge lines of the molded bodies or neighboring two faces is/are sealed, and exhaust gas inlet passages and exhaust gas outlet passages are formed between the porous corrugated plate through the porous flat plates; an inner case 6 holding the filter device 5; a guide rail 7 disposed integrally with the inner case 6; and a guide rail support member 8 disposed to an inner wall of the reactor so that the guide rail support member 8 fits the guide rail 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an exhaust gas treatment apparatus for removing particulate matter PM contained in automobile and stationary exhaust gas, and more particularly to a particulate matter removing filter ( In the following, the present invention relates to an exhaust gas treatment apparatus which is captured, fixed, burned and removed by DPF) and has a low differential pressure when the exhaust gas temperature rises, and which can be operated continuously for a long time.

  Recently, cogeneration systems and automobiles that use a diesel engine for distributed power source, which is an internal combustion engine, are increasing mainly in urban areas. PM and NOx emission regulations are applied to these exhaust gases, and the region However, it is urgently necessary to install an exhaust gas treatment device as in large plants. In particular, a DPF (diesel particulate filter) used in a diesel exhaust gas treatment apparatus is important because it removes PM contained in exhaust gas.

  In Japanese Patent Application No. 2003-393879, which is a prior application of the present application, the inventors have a basic unit of a pair of a porous corrugated plate and a porous flat plate on which an exhaust gas purification catalyst is supported, and corrugated plate ridge lines of the porous corrugated plate. Are formed so as to be alternately perpendicular to each other (hereinafter sometimes referred to as a crossed honeycomb), and one of the side surfaces orthogonal to the corrugated ridge line of the formed body, or two adjacent to each other A PM-containing exhaust gas purifying filter device in which a surface is sealed and an exhaust gas inflow path and an outflow path are formed between the porous flat plate and the porous corrugated plate has been proposed. In order to perform exhaust gas treatment and purge of ash accumulated in the filter, this filter device needs to shut off the exhaust gas inlet portion, the outlet portion (one or two places), and the purge outlet. In the above-described crossed honeycomb, during normal exhaust gas treatment, PM in the gas entering from the exhaust gas inlet is filtered and discharged from the exhaust gas outlet (see FIG. 3). When ash accumulates in the crossed honeycomb, the accumulated ash can be purged and discharged by opening a valve (normally closed) at the exhaust gas purge outlet. In order to perform these operations without exhaust gas leakage, it is necessary to completely seal each part. If the seal of each part is incomplete, the exhaust gas leaks and harmful PM is discharged. Therefore, a method is used in which the crossed honeycomb is once installed in the inner case, the inner case is fixed in the reactor using a sealing material in the reactor, and then the reactor is installed in the exhaust gas pipe. The inner case in which the cross honeycomb is installed is installed in the reactor and installed in the exhaust gas pipe while visually checking the contact portions of the sealing material and the reactor at the four sides of the exhaust gas inlet and outlet and purge outlet. .

  When exhaust gas with high PM concentration or continuous low-load operation is performed using such a reactor, after 1 to several years, the differential pressure due to iron rust and ash accumulated inside the cross honeycomb An increase could occur. Even when the exhaust gas treatment time is short, the cross honeycomb may be displaced from the inner case due to engine vibration or the like, and the exhaust gas may leak. In such a case, it is necessary to replace the crossed honeycomb. However, for the replacement, a complicated operation of removing the reactor using a crane or the like and further removing the crossed honeycomb from the reactor is necessary.

  An object of the present invention is to provide an improved exhaust gas treatment device that can easily replace the specific filter device (crossing honeycomb) with a small number of people (or one person) without using a machine such as a crane. It is in.

  In order to achieve the above object, the present inventors used a reactor provided with a flow path of an exhaust gas inlet, an outlet and a purge outlet as a system capable of exchanging crossed honeycombs while the reactor is installed in a pipe. It was found that the crossed honeycomb can be easily replaced by providing a guide rail on the inner case of the crossed honeycomb so that it can be inserted into and removed from the reactor directly.

The invention claimed in the present application is as follows.
(1) An exhaust gas treatment apparatus having a reactor detachably provided in an exhaust gas conduit, wherein the reactor is based on a pair of a porous corrugated plate and a porous flat plate carrying an exhaust gas purification catalyst. And having a molded body laminated such that corrugated ridge lines of the porous corrugated sheet are alternately orthogonal to each other, one surface of the side surface orthogonal to the corrugated ridge line of the molded body, or two surfaces adjacent to each other A filter device in which an exhaust gas inflow path and an outflow path are formed between the porous flat plate and the porous corrugated plate via the porous flat plate, an inner case for holding the filter device, and an inner case An apparatus comprising: a guide rail provided integrally; and a guide rail support member provided on an inner wall of the exhaust gas pipe so as to be fitted to the guide rail.
(2) a filter line passing through the exhaust gas outflow path of the filter device, and a purge line for purging the filter device with the exhaust gas by opening a surface opposite to the side surface of the filter device into which the exhaust gas flows. The exhaust gas purifier according to (1), further comprising a switching valve for selecting one of the two pipe lines.
(3) Each of the exhaust gas pipes has a branch pipe in which the reactor is arranged, and the branch pipes are connected to the purge pipe line and the filter pipe line, respectively (2 ) The device described.
(4) The guide rail and the guide rail support member each have a U-shaped or key-shaped cross section, and a packing or cushioning material is sandwiched between them. A device according to the above.

  According to the present invention, it is possible to obtain an exhaust gas treatment apparatus that can easily replace a crossed honeycomb without removing the reactor from the piping, is easy to maintain, and hardly causes gas leakage.

  FIG. 1 is a side view of the exhaust gas treatment apparatus of the present invention, and FIG. 2 is a front view thereof. This apparatus has a reactor 2 detachably provided in each branch pipe of the exhaust gas pipe 1, and the reactor 2 has a function of oxidizing an exhaust gas purification catalyst (for example, NO in exhaust gas to NO 2). It has a molded body in which a pair of a porous corrugated plate 3 and a porous flat plate 4 on which a noble metal catalyst (such as platinum) is supported is laminated so that corrugated ridges of the porous corrugated plate are alternately orthogonal. Then, one surface of the side surface orthogonal to the corrugated ridge line of the molded body is sealed, and an exhaust gas inflow path and an outflow path are formed between the porous corrugated plate and the porous corrugated plate, respectively. Filter device 5, inner case 6 that holds the filter device, guide rail 7 that is provided integrally with the inner case, and guide rail that is provided on the inner wall of the exhaust gas pipe so as to fit the guide rail 7 A support member 8; A filter line 9 that passes through an exhaust gas outflow path of the filter device 5, and a purge line 10 for opening the surface of the filter device 5 that faces the side surface into which the exhaust gas flows in and purging the filter device with the exhaust gas, And a switching valve 11 for selecting one of the two pipe lines. The filter pipe 9 is a branch pipe (four pipes) communicating with the two-side exhaust gas outlet side surfaces of the filter device (cross DPF) 5 and these are gathered in the downstream, and the purge pipe 10 is The branch pipes (three pipes) communicating with the side of the filter device 5 facing the side face on the exhaust gas inlet side, and these are assembled in the wake. The purge line 10 is provided with a switching valve (open / close valve) 11 for selecting one of the two lines 9 and 10.

  The switching valve 11 is closed during normal operation and opened during purging. The filter pipe 9 does not need to be provided with an on-off valve after the part gathered in the wake part, but in order to further enhance the purge effect, it is better to install it (closed at the time of purging).

  FIG. 4 is an explanatory diagram of the reactor 2 used in the present invention. The reactor 2 includes an inner case 6 that holds a filter device (crossed honeycomb) 5, a guide rail 7 that is provided integrally with the inner case 6, and an inner case support plate 12. The exhaust gas outlet passage in the upper and lower two directions (viewed from the drawing) of the filter device 5 communicates with the purge conduit 10 in FIG. A guide rail support member 8 adapted to the guide rail 7 of the inner case 6 is provided on the inner wall of the branch pipe to which the reactor 2 is mounted.

  In FIG. 1, in order to attach the reactor 2 to the branch pipe, as shown in FIG. 4, the filter device 5 housed in the inner case 6 is lifted together with the inner case support plate 12 and guided from a predetermined opening of the branch pipe. What is necessary is just to make the front-end | tip of the guide rail 7 agree | coincide with the rail support member 8, to slide ahead with the inner case support plate 12, to insert in a branch pipe, and to fix.

  FIG. 5 is the same as FIG. 1 except that the filter device 5A in which two adjacent surfaces of the side surface of the molded body in which a porous corrugated plate and a porous flat plate are laminated is sealed is installed in two branch pipes. It is a side view of the exhaust gas processing apparatus made the same as an example.

  FIG. 6 shows various embodiments of the guide rail 7 and the supporting member 8 of the reactor 2 installed in the branch pipe 1A, and has a cross-sectional I shape, a U shape, an L shape, a key shape, and the like. In particular, a U-shape or a key shape is preferable in terms of sealing properties, and it is preferable to have a structure in which a packing or cushioning material 13 is sandwiched between them. By setting it as such a structure, the seal | sticker between the reactor 2 and an exhaust gas pipe can be ensured, and a gas leak can be prevented.

  FIG. 7 shows a schematic plan view in which the reactor 2 of the present invention is mounted on the exhaust gas pipe 1A. The inner case support plate 12 is provided with a handle 14, and on the rear surface of the reactor 2 in contact with the exhaust gas pipe 1A. A heat insulating material 15 is provided by the heat insulating material support portion 17 and a packing 16 is provided at the periphery of the opening, and the seal is completed together with the heat insulating material.

  According to the above-described embodiment, the insertion / removal and fixing of the intersecting honeycomb are facilitated by sliding the guide rail. In addition, gas is leaked at the inlet, outlet, and purge outlet of the crossed honeycomb when gas is passed by installing packing to keep airtightness around the inner side of the pipe, the guide rail, and the front opening, which is the joint between the crossed honeycomb and the pipe. Can be prevented.

  In addition, in the said Example, the reactor 2 may use either the structure attached / taken out from right and left with respect to exhaust gas piping, or the structure attached / taken out from upper and lower sides. The guide rail and the guide rail support member may be provided on the reactor side as long as the guide rail and the guide rail support member can be attached and detached by sliding the reactor.

Hereinafter, an example in which an existing filter device (crossed honeycomb) is modified to the device (reactor) of the present invention will be described, but it goes without saying that the present invention can be applied to a new device.
[Example 1]
An exchange experiment of the crossed honeycomb DPF of the stationary diesel exhaust gas treatment system according to the present invention was conducted. A pipe with an inner diameter of 200 mmΦ was installed at the exhaust gas outlet of a diesel engine with a power generation capacity of 500 kW, and a reactor was installed at a position 2.5 m behind the exhaust gas outlet. The reactor (FIG. 3) has a structure in which six crossing honeycombs (FIG. 2) having an inlet of 400 × 400 mm square and a length of 300 mm are attached. The flow path to each cross honeycomb is an inner dimension of 405 x 405 mm square, and the DPF mounting part is 5 mm thick, 40 mm high, and 405 mm long stainless steel guide rails at two locations (up and down at intervals of 280 mm) ( A total of four) were installed. The installation front of the crossing honeycomb of the reactor was opened in a rectangular shape of 402 × 302 mm. The inner case of the crossed honeycomb to be replaced has guide rails with a thickness of 5 mm, height of 40 mm, and length of 405 mm installed on both end faces (width 20 mm) that support the outlet. A 5 mm long, 4 mm high, and 405 mm long support for preventing packing slippage was attached. Further, a packing presser having a thickness of 5 mm and a width of 50 mm and a support for fixing the crossed honeycomb (bolt fixing) were attached to the front face of the hand at the time of insertion.
The existing cross-honeycomb bolts were removed and pulled out, and the cross-honeycomb with packings attached to each required portion was inserted, and the bolts were closed. The time required for exchanging six cross honeycombs by one person was about three hours, and no removal machine was required.

[Example 2]
In the same manner as in Example 1, an exchange experiment of the crossed honeycomb DPF of the stationary diesel exhaust gas treatment system was performed. A pipe with an inner diameter of 150 mmΦ was installed at the exhaust gas outlet of a diesel engine with a power generation capacity of 180 kW, and a reactor was installed at a position 1.5 m behind the exhaust gas outlet. The reactor (FIG. 3) has a structure in which two crossed honeycombs having an inlet of 400 × 400 mm square and a length of 300 mm are attached. Unlike Example 1, a crossed honeycomb with one exit was used. The flow path to each cross honeycomb is an inner dimension of 405 x 405 mm square, and the DPF mounting part is 5 mm thick, 40 mm high, and 405 mm long stainless steel guide rails at two locations (up and down at intervals of 280 mm) ( A total of four) were installed. The installation front of the crossing honeycomb of the reactor was opened in a rectangular shape of 402 × 302 mm. The inner case of the crossed honeycomb to be replaced has guide rails with a thickness of 5 mm, height of 40 mm, and length of 405 mm installed on both end faces (width 20 mm) that support the outlet. A 5 mm long, 4 mm high, and 405 mm long support for preventing packing slippage was attached. Further, a packing presser having a thickness of 5 mm and a width of 50 mm and a support for fixing the crossed honeycomb (bolt fixing) were attached to the front face of the hand at the time of insertion.
The bolts of existing cross honeycombs were removed and pulled out and removed, and cross honeycombs with packings attached to each required portion were inserted and bolted. The time required for exchanging two crossed honeycombs by one person was about one hour, and no removal machine was required.

[Comparative Example 1]
Using the same stationary diesel engine as in Example 1, an experiment for exchanging the intersecting honeycomb was performed in a reactor in which the intersecting honeycomb was housed. A pipe with an inner diameter of 200 mmΦ was installed at the exhaust gas outlet of a diesel engine with a power generation capacity of 500 kW, and a reactor was installed at a position 2.5 m behind the exhaust gas outlet. The reactor has a structure that can store two crossed honeycombs with an entrance of 400 × 400 mm square and a length of 300 mm. The reactor had a structure in which the inner dimension expanded from 150 mmΦ to 1.2 m × 700 mm square, and the inlet outer peripheral part and the outer peripheral part of the crossed honeycomb were completely held / sealed in parallel on the downstream side of 300 mm.

  In order to replace the existing cross honeycomb, the reactor was suspended by a crane and removed, and the existing cross honeycomb was removed from the reactor. After the new cross honeycomb was installed in the reactor, the reactor was suspended by a crane and attached to the pipe. The time required for replacement of two crossed honeycombs by three people was about 10 hours.

It is a side view of the exhaust gas treatment apparatus of the present invention, It is a front view of the exhaust gas treatment apparatus of the present invention, Explanatory drawing which shows the waste gas flow mode of the cross honeycomb DPF by this invention, It is explanatory drawing of the reactor used for this invention, and the figure which showed the cross honeycomb inner case. Side view of an exhaust gas treatment apparatus showing another embodiment of the present invention, Explanatory drawing which shows the installation method of the reactor of this invention, The top view of the state which installed the reactor of this invention in the exhaust gas pipeline.

Explanation of symbols

  1. Exhaust gas line, 1A. Branch pipe, 2. 2. reactor, 3. porous corrugated plate; Porous flat plate, 5.5A. Filter device, 6. 6. Inner case Guide rails, 8. 8. guide rail support member, Filter line, 10. 10. purge line; Switching valve, 12. Support plate, 13. Cushioning material, 14. Handle, 15. Insulation, 16. Packing, 17. Insulation support.

Claims (4)

An exhaust gas treatment apparatus having a reactor detachably provided in an exhaust gas conduit, the reactor having a porous corrugated plate and a porous flat plate carrying an exhaust gas purification catalyst as a basic unit, the porous unit The corrugated sheet ridges are formed so that the corrugated ridges of the corrugated sheet are alternately orthogonal to each other, and one surface of the corrugated sheet orthogonal to the corrugated ridge lines or two surfaces adjacent to each other are sealed. A filter device in which an exhaust gas inflow path and an outflow path are formed between the porous corrugated plate and the porous corrugated plate via the porous flat plate, an inner case holding the filter device, and the inner case integrally An exhaust gas treatment apparatus comprising: a guide rail provided; and a guide rail support member provided on an inner wall of the exhaust gas pipe so as to be fitted to the guide rail. A filter line through the exhaust gas outflow path of the filter device, a purge line for purging the filter device with the exhaust gas by opening a surface facing the side surface of the filter device into which the exhaust gas flows, and the two The apparatus according to claim 1, further comprising a switching valve for selecting one of the two pipe lines. 3. The exhaust gas pipe according to claim 2, wherein the exhaust pipe has a branch pipe in which the reactor is arranged, and the branch pipe is connected to the purge pipe and the filter pipe, respectively. apparatus. The apparatus according to any one of claims 1 to 3, wherein the guide rail and the guide rail support member have a U-shaped cross-section or a key shape, and a packing or a cushioning material is sandwiched therebetween. .

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