JP3252166B2 - Exhaust gas treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine exhaust gas treatment device.

[0002]

2. Description of the Related Art For example, a denitration and dedusting apparatus for removing nitrogen oxides (NOx) and dust contained in exhaust gas of a diesel engine is known. This denitration apparatus is an apparatus that passes exhaust gas through a catalyst packed bed and removes NOx by a catalytic reaction. As this type of denitration apparatus, a fixed bed reactor and a fluidized bed reactor in a gravitational field are known. (See, for example, JP-A-52-131970)

[0003] In the former fixed-bed reactor, dust contained in engine exhaust gas causes clogging of the reactor, which significantly impairs the processing efficiency. There are issues such as not being able to do.

The latter fluidized bed reactor in a gravitational field has a disadvantage that it cannot cope with a change in the amount of exhaust gas due to a change in engine load. Since the area of the device must be increased, there is a problem that the device becomes larger.

It is an object of the present invention to obtain a large fluidized gas linear velocity by using a fluidized bed reactor as a centrifugal fluidized bed, to increase the amount of exhaust gas to be treated, to reduce the size of the entire apparatus, and to automatically use a catalyst. supply and to perform the automatic ejection of the deteriorated catalyst, waste gas etc. exhaust gas denitration reaction can be performed with high efficient
And to provide a scan of the processor.

[0006]

Means for Solving the Problems The object of the present invention is to provide an engine
A cylindrical fluidized-bed reactor having a cylindrical dispersion plate inside the outer cylinder for introducing the gas to be treated of exhaust gas and having an exhaust pipe at one end along the central axis of the dispersion plate can be driven to rotate. And a cylindrical filter in the center of the fluidized bed reactor.
Then, a catalyst is put in the cavity between the filter and the dispersion plate, and a catalyst supply pipe having the same axis as the exhaust pipe is connected to the other end of the fluidized bed reactor, and a catalyst supply pipe is provided on the opposite side of the catalyst supply pipe. This is achieved by providing a catalyst discharge flow path at a fluidized bed reactor section separated from the exhaust gas introduction side by a partition plate, and communicating the catalyst discharge port provided in the fluidized bed reactor with the catalyst discharge flow path.

[0007]

Next, details of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional front view, FIG. 2 is a longitudinal sectional front view of another embodiment, and FIG. 3 is a longitudinal sectional front view of an embodiment having a tapered dispersion plate.

The structure of the embodiment shown in FIG. 1 will be described. Reference numeral 1 denotes a fluidized bed reactor having a cylindrical structure in which a cylindrical dispersion plate 2 is formed by connecting end plates 3 and 4 to both sides thereof. is there. A shaft cylinder 5 is fixed to the center of the one end plate 3, and a supply flow path 5 a for a catalyst 6 orthogonal to the axis of the shaft cylinder 5 is integrally formed inside the shaft cylinder 5. I have. Also,
At the center of the other end plate 4, one end of an exhaust pipe 7 whose axis coincides with the central axis of the barrel 5 is fixed. In the figure, reference numeral 8 denotes a filter provided on the free board and having a cylindrical structure having the same axis as the shaft cylinder 5 and the exhaust pipe 7 to suppress the discharge of the powdered catalyst 6 and dust.

Reference numeral 9 denotes a catalyst supply pipe connected to a hopper (not shown) of the catalyst 6, and a lower part of the catalyst supply pipe 9 is integrally formed with a horizontal catalyst reservoir 9a. The shaft cylinder 5 is rotatably supported via a bearing 10. Further, a discharge port 11 for the catalyst 6 is provided on one side of the end plate 4 away from the supply flow path 5a of the catalyst 6. This outlet 11 is opened in the catalyst fluidized bed.

Numeral 12 is larger in diameter than the fluidized bed reactor 1 and
And the entire fluidized bed reactor 1 and a part of the exhaust pipe 7,
An exhaust gas introduction tube formed so as to cover a part of the catalyst reservoir 9a, and an exhaust gas introduction tube 13 directly connected to an exhaust pipe (not shown) of the engine is provided on one side of the introduction tube 12. It is provided.

In addition, a catalyst discharge flow path 15 is formed in the introduction outer cylinder 12 on one end plate 4 side of the fluidized bed reactor 1 which is separated from the exhaust gas introduction side by a partition plate 14. The exhaust port 1 of the catalyst 6 is provided in the catalyst exhaust passage 15.
1 is in communication. The partition plate 14 and the outer plate 12a constituting the catalyst discharge channel 15 are respectively provided with bearings 16,
One side edge of the dispersion plate 2 and the base of the exhaust pipe 7 are rotatable via 17, that is, the fluidized bed reactor 1 is rotatably supported at three points with respect to the introduction outer cylinder 12.

The outer cylinder 12 for introducing exhaust gas and the fluidized bed reactor 1 are configured to be decomposable, and the filter 8 can be replaced.
Naturally, maintenance such as cleaning can be performed. As means for rotating and driving the fluidized bed reactor 1, a pulley (not shown) is provided on the exhaust pipe 7, and connected to the rotation shaft of the engine via a drive transmission mechanism and a speed reduction mechanism. The rotation corresponding to the number is provided to the fluidized bed reactor 1.

Next, the operation of the above embodiment will be described. When the engine is started, its rotation is driven by the exhaust pipe 7 via a speed reduction mechanism or a drive transmission mechanism, and the fluidized bed reactor 1 is driven. Rotate. The catalyst 6 accommodated in the fluidized bed reactor 1 is caused to flow by the centrifugal force so as to stick to the inner surface of the dispersion plate 2. The exhaust gas enters the interior through the dispersion plate 2 due to the gas pressure of the engine, and the exhaust gas contacts and reacts with the catalyst while flowing through the catalyst 6, for example, a denitration reaction is performed.

The exhaust gas purified by the denitration reaction is discharged to the outside through an exhaust pipe 7 through a filter 8. Although not shown, when the pore size of the dispersion plate 2 is made small so as not to be clogged with dust (unburned carbon), the dispersion plate 2
The dust adhering to or adhering to the outer surface of the introductory member is scraped off by a scraper and collected in a dust collecting portion provided at a lower portion of the introduction outer cylinder 12. When a relatively large hole is formed in the dispersion plate 2 to allow the passage of dust, the dust is collected in the fluidized bed, and the collected dust reacts with exhaust gas to enable denitration.

On the other hand, the catalyst 6 in the catalyst reservoir 9a of the catalyst supply pipe 9 is supplied to the fluidized bed through the supply flow path 5a of the barrel 5 by the action of centrifugal force. Further, the catalyst 6 that has been deteriorated and powdered by the reaction jumps out of the outlet 11, and becomes a catalyst discharge channel 15.
Can be recovered through

In the embodiment shown in FIG. 2, a disk 18 having a diameter larger than the diameter of the barrel 5 is used instead of the catalyst supply flow path 5a shown in FIG.
Are oppositely arranged at the stay 19. With this configuration, the catalyst 6 flowing into the fluidized bed reactor 1 by the action of the centrifugal force is uniformly supplied in the circumferential direction. The same components as those in the embodiment of FIG. 1 are denoted by the same reference numerals, and a detailed description of the configuration will be omitted. Also, the operation is substantially the same as that of FIG. 1 except for a part, and therefore, detailed description of the operation is omitted.

The embodiment shown in FIG. 3 is different from the embodiment shown in FIG. 1 in that the dispersion plate 2a has a tapered shape so that the deteriorated powdery catalyst 6 can be efficiently discharged from the discharge port 11. It was done. Further, the same reference numerals are given to the same structural parts as those in FIG. 1 and the detailed description of the configuration is omitted. Further, the operation is substantially the same as that of the embodiment of FIG. 1 except for the operation of the dispersing plate 2a, and a detailed explanation of the operation will be omitted.

By selecting a catalyst, not only dedusting but also decomposing chemical reactions such as denitration, desulfurization and desalination are possible.
Its field of use is wide.

[0019]

According to the configuration of the present invention as described above,
The following effects can be obtained. (A) Since the fluidized bed reactor is rotatable in an exhaust gas atmosphere, the fluidized bed can be a centrifugal fluidized bed. Therefore, the fluidized gas linear velocity is larger than that of a conventional fluidized bed in a gravitational field. As a result, since the amount of exhaust gas treatment can be increased, the entire apparatus can be downsized and can be mounted on an automobile or the like, and the pollution problem due to exhaust gas can be rationally solved. (B) By using the rotational power of the engine as the drive source before the fluidized bed reaction, the amount of exhaust gas corresponding to the engine speed can be efficiently processed. (C) The supply of the catalyst and the discharge and exchange of the degraded and powdered catalyst are automatically performed, so that the exhaust gas can be efficiently denitrated in the reactor.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of the device of the present invention.

FIG. 2 is a longitudinal sectional front view of another embodiment.

FIG. 3 is a longitudinal sectional front view of still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluidized bed reactor 2 Dispersion plate 2a Dispersion plate 3 End plate 4 End plate 5 Shaft 5a Supply flow path 6 Catalyst 7 Exhaust pipe 9 Catalyst supply pipe 9a Catalyst reservoir 11 Outlet 12 Exhaust gas introduction outer cylinder 13 Exhaust gas introduction pipe 14 Partition plate 15 Catalyst discharge channel 18 Disk

Claims (1)

(57) [Claims] 1. A fluidized bed having a cylindrical structure having a cylindrical dispersion plate in an outer cylinder for introducing a gas to be treated of engine exhaust gas and having an exhaust pipe on one end side along a central axis of the dispersion plate. A reactor is rotatably driven, and a circle is formed at the center of the fluidized bed reactor.
A cylindrical filter is provided, and the space between the filter and the dispersion plate is provided.
A catalyst is placed in the cavity, and a catalyst supply pipe having the same axis as the exhaust pipe is connected to the other end of the fluidized bed reactor. The catalyst supply pipe is provided on the opposite side of the catalyst supply pipe, and a partition plate is provided on the exhaust gas introduction side. An exhaust gas treatment apparatus characterized in that a catalyst discharge flow path is provided in a partitioned fluidized bed reactor portion, and a catalyst discharge port provided in the fluidized bed reactor is communicated with the catalyst discharge flow path.