JP2000061499A - Sludge drying treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate solid matter from a malodorous gas generated inside the heat transfer drum of a centrifugal thin film dryer. SOLUTION: In this system, a malodorous gas generated inside the heat transfer drum 1a of a centrifugal thin film dryer 1 is transferred to a deodorization device 21 through malodorous gas lines 25 and 26 and a scrubber 19. The malodorous gas lines 25 and 26 have U-shaped parts such as part 25a, respectively. In the U-shaped part 25a, etc., solid matter in the malodorous gas can be separated. The solid matter separated in each of the U-shaped part 25a, etc., is withdrawn from the corresponding one of withdrawal ports 27 and falls.

Description

Detailed Description of the Invention

The present invention relates to a sludge drying treatment system used for, for example, sewage treatment, industrial wastewater treatment, nuclear waste liquid treatment and the like.

2. Description of the Related Art A conventional sludge drying treatment system has a centrifugal thin film drying system having a heat transfer cylinder 1a and a rotary shaft 2 provided coaxially with the heat transfer cylinder 1a and having a blade 6 attached thereto, as shown in FIG. Equipped with machine 1. The rotary shaft 2 of the centrifugal thin film dryer 1 is rotatably supported by an upper bearing 8 and a lower bearing 9 held by a frame 10.
The rotary shaft 2 is driven by a drive motor 3 via a V belt 3a.

The odorous gas generated in the heat transfer cylinder 1a of the centrifugal thin film dryer 1 is extracted by the extraction blower 20 through the exhaust port 12, and the odorous gas is then removed by the odorous gas pipe 25.
Is transferred to the scrubber 19 via.

The scrubber 19 comprises a hollow body, and a nozzle 31 capable of showering water is provided on the upper portion thereof. In this case, the nozzle 31 supplies the discharge water (cooling water) 32 of the sewage treatment plant. The odorous gas receives the cooling water 32 from the nozzle 31, a part of which is condensed and discharged together with the cooling water 32 from the lower portion of the scrubber 19. Then, the odorous gas is transferred to the deodorizing device 21 through the odorous gas pipe 26.

The deodorizing device 21 is filled with a catalyst heated to 300 ° C. or higher. By the action of this catalyst, the odorous gas is decomposed into water, carbon dioxide, etc., deodorized and released to the atmosphere.

[0005]

The odorous gas generated in the centrifugal thin film dryer 1 contains solid matter of sludge, dust, hair and the like (solid matter). Although this solid content is washed away with the cooling water in the scrubber 19, a part of the solid content is attached and remains inside the odor gas pipe 25, the scrubber 19, and the odor gas pipe 26. When the amount of the solid matter attached increases, the subsequent odorous gas cannot be sufficiently extracted, so that the water content of the dried sludge discharged by the centrifugal thin film dryer 1 does not sufficiently decrease. Further, since the solid content is spread over a wide area without being concentrated on a specific place, maintenance such as removal work becomes complicated. Further, since the odorous gas pipe 26 is attached horizontally to the ground, the solid content that cannot be removed by the scrubber 19 is transferred to the deodorizing device 21.

Therefore, the catalyst of the deodorizing device 21 may deteriorate and the performance of decomposing odorous gas may deteriorate. Since the gas that has passed through the deodorizing device 21 is released to the atmosphere, it is important to maintain the decomposing performance of the deodorizing device 21 in consideration of the effect on the environment.

The present invention has been made in consideration of the above points, and a sludge drying treatment system capable of effectively removing solids generated from a centrifugal thin film dryer and maintaining the decomposition performance of a deodorizing device. The purpose is to provide.

[0008]

DISCLOSURE OF THE INVENTION The present invention is directed to a heat transfer cylinder having a vertically long cylindrical shape and a rotary shaft provided coaxially with the heat transfer cylinder and equipped with a blade for scraping sludge adhering to the inside of the heat transfer cylinder. A centrifugal thin film dryer having a, a deodorizing device for deodorizing odorous gas generated inside the centrifugal thin film dryer, and an odor gas pipe provided between the centrifugal thin film dryer and the deodorizing device,
The odorous gas pipe has a U-shaped portion protruding downward, which is a sludge drying treatment system.

According to the present invention, the sludge is dehydrated and dried in the heat transfer cylinder of the centrifugal thin film dryer. The odorous gas generated in the heat transfer drum of the centrifugal thin film dryer is sent to the deodorizing device through the odorous gas pipe and is deodorized. During this period, the solids contained in the odorous gas are collected by separating the odorous odor from the odorous gas in the U-shaped portion of the pipe.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiments of the present invention will be described with reference to the drawings. 1, 3 and 4 are
1 is a diagram showing an embodiment of a sludge drying treatment system according to the present invention. As shown in FIG. 1, the sludge drying treatment system includes a centrifugal thin film dryer 1 for dehydrating and drying sludge, a deodorizing device 21 for deodorizing odorous gas generated inside the centrifugal thin film dryer 1, and a centrifugal thin film dryer 1. An odor gas pipe 25, a scrubber 19, and an odor gas pipe 26 arranged between the deodorizer 21 and the deodorizer 21 are provided.

Next, FIGS. 3A, 3B, 3C and 3D
The centrifugal thin film dryer 1 will be described in detail with reference to FIG.

Here, FIG. 3 (A) is an overall sectional view of the centrifugal thin film dryer, FIG. 3 (B) is a partially enlarged view of a portion b of FIG. 3 (A),
FIG. 3C is an enlarged view of portion c of FIG. 3A, and FIG. 3D is a partially enlarged view of portion d of FIG. 3A. In addition, FIG.
It is sectional drawing which follows the EE line of (A).

As shown in FIGS. 3 and 4, the centrifugal thin film dryer 1 includes a thin-walled heat transfer cylinder 1a and a rotary shaft 2 provided inside the heat transfer cylinder 1a and coaxial with the heat transfer cylinder 1a. Have The rotating shaft 2 is rotatably supported by an upper bearing 8 and a lower bearing 9 protected by a frame 10, and is rotationally driven by a drive motor 3 via a V belt 3a.

A distribution ring 5 is provided above the rotary shaft 2 so that the sludge supplied from the sludge inlet 4 is uniformly introduced into the inner surface of the heat transfer cylinder 1 through the distribution ring 5. ing. Furthermore, in order to form a thin film of sludge dispersed in the heat transfer cylinder 1a, a plurality of blades 6 are attached in a plurality of stages in the axial direction and the circumferential direction of the rotating shaft 2. Also,
An exhaust port 12 for exhausting vaporized vapor generated from sludge is provided on the upper part of the heat transfer cylinder 1a. Further, on the outer side of the heat transfer cylinder 1a, a steam jacket 13 for passing steam serving as a heat source for dehydrating and drying sludge is provided, and steam flows from the pressurized steam inlet 14 into the steam jacket 13. The steam in the steam jacket 13 flows out from the pressurized steam outlet 15.

The sludge 16 supplied from the sludge inlet 4 into the heat transfer cylinder 1a is dispersed along the inner surface of the transfer cylinder 1 by the distribution ring 5 rotating with the rotating shaft 2. further,
The sludge 16 is scraped off by the blade 6 which rotates together with the rotary shaft 2 and spread in a thin film on the inner surface of the heat transfer cylinder 1a. Then, the thin film sludge 16 gradually moves downward due to gravity and the pressure of new sludge supplied one after another. At that time, the sludge 16 is removed by the heating steam supplied to the steam jacket 13 outside the heat transfer cylinder 1a.
Is heated by. Thereafter, the water content of the sludge 16 is gradually dehydrated to become the dried sludge 17, which is discharged from the discharge port 11 provided at the lower end of the heat transfer cylinder 1. The heat transfer cylinder 1a has an exhaust port 1 for exhausting odorous gas evaporated from the sludge 16.
Two are provided.

Further, as shown in FIG. 1, a centrifugal thin film dryer 1
The odorous gas generated in the heat transfer cylinder 1a of the
Is extracted through the exhaust port 12, and the odorous gas is
After that, it is transferred to the scrubber 19 via the odorous gas pipe 25.

The scrubber 19 is made of a hollow body, and a nozzle 31 capable of showering water is provided above the hollow body. In this case, the nozzle 31 supplies the discharge water (cooling water) 32 of the sewage treatment plant. The odorous gas receives the cooling water 32 from the nozzle 31, a part of which is condensed and discharged together with the cooling water 32 from the lower portion of the scrubber 19. Then, the odorous gas is transferred to the deodorizing device 21 through the odorous gas pipe 26.

The deodorizing device 21 is filled with a catalyst heated to 300 ° C. or higher, and by the action of this catalyst, the odorous gas is decomposed into water, carbon dioxide, etc., deodorized and released into the atmosphere.

Further, as shown in FIG. 1, the odorous gas pipe 2
5 and 26 are U-shaped portions 25a and 26 protruding downward, respectively.
a. Further, these U-shaped portions 25a, 26a
Is provided with an outlet 27 for collecting solids.

By the way, in the present embodiment, both the odorous gas pipes 25 and 26 have U-shaped portions 25a and 26a, but only one of them has the U-shaped portions 25a and 26a. Good. Further, the number of outlets 27 may be plural.

Next, the operation of this embodiment having such a configuration will be described. As described above, the sludge supplied into the heat transfer drum 1a of the centrifugal thin film dryer 1 is dehydrated and dried in the heat transfer drum 1a, and at the same time, odorous gas is generated in the heat transfer drum 1a. The odorous gas is then discharged from the extraction port 12 to the odorous gas pipe 25.
Flows in.

The odorous gas in the odorous gas pipe 25 contains solids. Of these, the solids having a large weight fall to the inner wall of the horizontal portion 25b of the odorous gas pipe 25 due to gravity, and while receiving friction from the inner wall. Move in the direction of odor gas transfer. However, since the U-shaped portion 25a rises vertically, most of the solid content cannot be combined with the odorous gas and is separated.

The solids having a small weight are transferred together with the odorous gas, but the odorous gas pipe 25 has a U-shaped portion 25.
Since it has a and the transfer distance is longer than before,
Small solids, which were not possible in the past, can be dropped and similarly separated. The phenomenon that the smaller the solid content is separated as the transport distance is longer is the same as the phenomenon that the particle size of the stone deposited on the bottom of the river becomes smaller as it approaches the estuary.
Therefore, the solid content of the odorous gas can be concentratedly collected at the lower end portion 31 of the U-shaped portion 25a and then dropped from the outlet 27 and discharged.

After that, a part of the odorous gas is condensed in the scrubber 19, and then enters the odorous gas pipe 26. In the odorous gas pipe 26, solids are removed in the same manner as in the odorous gas pipe 25, and the odorous gas is then deodorized in the deodorizing device 21.

According to the present embodiment, the odorous gas pipe 2
Since the solid content of the odorous gas can be collected in the U-shaped portions 25a and 26a of the Nos. 5 and 26 as compared with the conventional case, the treatment performance of the sludge drying treatment system can be maintained for a longer period of time.

Further, since the solid content can be intensively collected at the lower end portions 31 of the U-shaped portions 25a and 26a, the maintenance becomes easier than before.

Next, another embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 2, a filter 28 for solid content recovery is detachably provided on the U-shaped portions 25a, 26a of the odorous gas pipes 25, 26, and a curved portion 29 is provided downstream of the lower end portion 31. Is formed. Other configurations are substantially the same as those of the embodiment shown in FIGS. 1, 3 and 4.

In FIG. 2, the same parts as those of the embodiment shown in FIGS. 1, 3 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, since the filter 28 is provided on the U-shaped portions 25a and 26a, the solid content in the odorous gas can be reliably recovered by this filter 28. Further, odorous gas can be forcibly collided with the inner wall at the curved portion 29, and the speed of the solid content can be reduced to be collected.
The solid content that is decelerated and collected in the bending portion 29 can then be dropped and discharged from the outlet 27 provided in the bending portion 29.

[0030]

As described above, according to the present invention, the odorous gas generated in the heat transfer cylinder of the centrifugal thin film dryer can be deodorized by the deodorizing device. During this time, the solid content in the odorous gas can be effectively separated in the U-shaped portion,
The solid content is not mixed in the deodorizing device, and the performance of the deodorizing device can be prevented from deteriorating.

[Brief description of drawings]

FIG. 1 is a schematic system diagram showing an embodiment of a sludge treatment system according to the present invention.

FIG. 2 is a schematic system diagram showing another embodiment of the sludge treatment system according to the present invention.

FIG. 3 is a structural cross-sectional view showing the configuration of a centrifugal thin film dryer.

FIG. 4 is a sectional view taken along the line EE of FIG.

FIG. 5 is a diagram showing a conventional sludge treatment system.

[Explanation of symbols]

1 heat transfer cylinder 2 rotation axes 6 blades 16 sludge 19 scrubber 20 Bleed air blower 21 Deodorizer 25 Odor gas piping 25a U-shaped part 26 Odor gas piping 26a U-shaped part 27 Exit 28 filters 29 Curved part 31 nozzles 32 cooling water

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Morikawa             No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation             Fuchu Factory F-term (reference) 3L113 AA04 AB05 AB08 AC05 AC15                       AC45 AC46 AC48 AC49 AC53                       AC56 AC57 AC62 AC63 AC67                       AC76 AC83 AC87 AC90 BA37                       CA08 DA05 DA22 DA26 DA30                 4D048 AA22 AB03 BA48X CC38                       CD03 CD05 CD08 DA03 DA13                 4D059 AA03 AA30 BD12 BD24 BD26                       BD40 BE02 BE48 CA16 CB12                       DA70 DB40                 4D076 AA03 AA14 AA24 BA13 BA19                       CB11 CD03 DA10 DA25 FA04                       FA12 FA18 HA06 HA10 HA11                       HA12 HA13 JA03 JA10

Claims (2)

[Claims] 1. A centrifugal thin film dryer having a vertically long cylindrical heat transfer cylinder, and a rotary shaft provided coaxially with the heat transfer cylinder and having a blade attached thereto for scraping sludge adhering to the inside of the heat transfer cylinder. The deodorizing device for deodorizing the odorous gas generated inside the centrifugal thin film dryer and the odorous gas pipe provided between the centrifugal thin film dryer and the deodorizing device are provided, and the odorous gas pipe projects downward. A sludge drying treatment system characterized by having a groove-like portion. 2. The sludge drying treatment system according to claim 1, wherein a U-shaped portion of the odorous gas pipe is provided with a solid content recovery filter.